## GUJARAT TECHNOLOGICAL UNIVERSITY DIPLOMA IN ENGINEERING - SEMESTER 4 - EXAMINATION - SUMMER 2026

ક$%&amp;ટમાં િવયોજન અને િનઃIવણ ના &gt;ુJયકારણો જણાવો.

| Subject Code: DI04006011                                                                                                 | Subject Code: DI04006011                                                                                                 | Subject Code: DI04006011                                                                                                                                                                      | Date: 19/05/2026                                                                                     |
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| Subject Name:  Concrete Technology                                                                                       | Subject Name:  Concrete Technology                                                                                       | Subject Name:  Concrete Technology                                                                                                                                                            |                                                                                                      |
| Time: 10:30 AM TO 01:00 PM                                                                                               | Time: 10:30 AM TO 01:00 PM                                                                                               | Time: 10:30 AM TO 01:00 PM                                                                                                                                                                    | Total Marks: 70                                                                                      |
| 1. Attempt all questions. 2. MakeSuitable assumptions wherever necessary 3. Figures to the right indicate full marks.    | 1. Attempt all questions. 2. MakeSuitable assumptions wherever necessary 3. Figures to the right indicate full marks.    | 1. Attempt all questions. 2. MakeSuitable assumptions wherever necessary 3. Figures to the right indicate full marks.                                                                         |                                                                                                      |
| 4. Use of simple calculators and non-programmable scientific calculators are permitted. 5. English version is authentic. | 4. Use of simple calculators and non-programmable scientific calculators are permitted. 5. English version is authentic. | 4. Use of simple calculators and non-programmable scientific calculators are permitted. 5. English version is authentic.                                                                      |                                                                                                      |
| Q.1 GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૧                                | (a)                                                                                                                      | Select the cement for the following works.                                                                                                                                                    | 03                                                                                                   |
|                                                                                                                          |                                                                                                                          | 1.  Under water construction 2.  All types of ordinary constructions 3.  For cold weather concreting 4.  RCC pipes 5.  For early removal of form works                                        |                                                                                                      |
|                                                                                                                          |                                                                                                                          | 6.  Oil well problems                                                                                                                                                                         |                                                                                                      |
| )                                                                                                                        | ( અ                                                                                                                      | નીચે દશાGLYPH<c=9,font=/QTBAAA+ShrutiRegular> વ ેલ ા ં કામો માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular> િસ મ ેGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટન ી   પ સંદગી કરો.                                        | ૦૩                                                                                                   |
|                                                                                                                          |                                                                                                                          | ૩. ઠંડા GLYPH<c=30,font=/QTBAAA+ShrutiRegular> દGLYPH<c=17,font=/QTBAAA+ShrutiRegular> શમાં બાંધકામ માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular> ૪. િસમેGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ  ક$%&ટ પાઈપ |                                                                                                      |
|                                                                                                                          |                                                                                                                          | ૫. ફોમGLYPH<c=9,font=/QTBAAA+ShrutiRegular>  વ ક GLYPH<c=9,font=/QTBAAA+ShrutiRegular>  જ+દ& ,ૂર કરવા.ું હોય 1યારGLYPH<c=17,font=/QTBAAA+ShrutiRegular>                                              |                                                                                                      |
|                                                                                                                          | (b)                                                                                                                      |                                                                                                                                                                                               | 04 ૦૪                                                                                                |
|                                                                                                                          |                                                                                                                          |                                                                                                                                                                                               | 07                                                                                                   |
|                                                                                                                          | (                                                                                                                        | એ:ીગેટ માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular> BIS > ુજબના ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટની યાદ & બનાવી એ:ીગેટ માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>નો એ:ીગેટ ઈ@પેAટ                         |                                                                                                      |
|                                                                                                                          |                                                                                                                          | અથવા                                                                                                                                                                                           |                                                                                                      |
|                                                                                                                          |                                                                                                                          | OR                                                                                                                                                                                            |                                                                                                      |
|                                                                                                                          |                                                                                                                          |                                                                                                                                                                                               | 03                                                                                                   |
| Q.2                                                                                                                      | (a)                                                                                                                      | Outline the key reasons for segregation and bleeding in concrete.                                                                                                                             |                                                                                                      |
|                                                                                                                          | (                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
| )                                                                                                                        |                                                                                                                          |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          |                                                                                                                          |                                                                                                                                                                                               | ૦૩                                                                                                   |
|                                                                                                                          | અ                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          |                                                                                                                          |                                                                                                                                                                                               | 07 ૦૭                                                                                                |
|                                                                                                                          |                                                                                                                          | પાણીની 7ુણવતા ક$%&ટને કGLYPH<c=17,font=/QTBAAA+ShrutiRegular>વી ર&તે અસર કરGLYPH<c=17,font=/QTBAAA+ShrutiRegular> છે  તે િવગતવાર ચચાGLYPH<c=9,font=/QTBAAA+ShrutiRegular> કરો.                              |                                                                                                      |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular>                                      | ૨                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          | (                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          | )                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          | ક                                                                                                                        |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          |                                                                                                                          | Discuss in detail how the quality of water affects concrete.                                                                                                                                  | Discuss in detail how the quality of water affects concrete.                                         |
|                                                                                                                          | (c)                                                                                                                      | (c)                                                                                                                                                                                           | (c)                                                                                                  |
|                                                                                                                          |                                                                                                                          | વે+Bુ ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટ  સંCૂણ િવગતો સાથે સમEવો.                                                                                                                               | વે+Bુ ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટ  સંCૂણ િવગતો સાથે સમEવો.                                      |
|                                                                                                                          | )                                                                                                                        | )                                                                                                                                                                                             | )                                                                                                    |
|                                                                                                                          | (c) ક                                                                                                                    | 6GLYPH<c=17,font=/QTBAAA+ShrutiRegular>શ ક$%&ટના 7ુણધમ8 .ું વણGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ન કરો.                                                                                          | 6GLYPH<c=17,font=/QTBAAA+ShrutiRegular>શ ક$%&ટના 7ુણધમ8 .ું વણGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ન કરો. |
|                                                                                                                          |                                                                                                                          | Enlist test of aggregate as per BIS Explain Aggregate Impact Value Test in detail.                                                                                                            | Enlist test of aggregate as per BIS Explain Aggregate Impact Value Test in detail.                   |
| ૬. તેલના 4ૂવાના GLYPH<c=30,font=/QTBAAA+ShrutiRegular>5ો માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>                              |                                                                                                                          |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          |                                                                                                                          |                                                                                                                                                                                               | ૦૭                                                                                                   |
| Describe the properties of fresh concrete.                                                                               |                                                                                                                          |                                                                                                                                                                                               |                                                                                                      |
|                                                                                                                          | ( બ )                                                                                                                    |                                                                                                                                                                                               |                                                                                                      |

(iii)Pozzolana

ુ

ં

|                                                                                           | (b)   | Explain factors affecting creep.                                                                                                                                                                                                                                                                                                             | 04   |
|-------------------------------------------------------------------------------------------|-------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------|
|                                                                                           | ( બ ) | સરકણ પર અસર કરતાં પKરબળો સમEવો.                                                                                                                                                                                                                                                                                                                  | ૦૪   |
|                                                                                           | (c)   | List methods of measurement of workability and explain one of them.                                                                                                                                                                                                                                                                          | 07   |
|                                                                                           | ( ક ) | વકMબીલીટ& માપવા માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ની ર&તો જણાવો અને કોઈ પણ એક ર&ત સમEવો.                                                                                                                                                                                                                                                          | ૦૭   |
|                                                                                           |       | અથવા OR                                                                                                                                                                                                                                                                                                                                       |      |
| Q.2                                                                                       | (a)   | What is laitance? Give its remedial measures.                                                                                                                                                                                                                                                                                                | 03   |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૨     | ( અ ) | લેટGLYPH<c=20,font=/QTBAAA+ShrutiRegular>સ   Nું છે?તેના િનવારણ ના ઉપાયો જણાવો.                                                                                                                                                                                                                                                                           | ૦૩   |
|                                                                                           | (b)   | Compare the Cube and Cylinder Strength of concrete.                                                                                                                                                                                                                                                                                          | 04   |
|                                                                                           | ( બ ) | ક$%&ટના Qુબ અને િસલીનડરની ?RGLYPH<c=17,font=/QTBAAA+ShrutiRegular>GLYPH<c=20,font=/QTBAAA+ShrutiRegular>થની સરખામણી કરો.                                                                                                                                                                                                                               | ૦૪   |
|                                                                                           | (c)   | Explain different methods of transportation of concrete.                                                                                                                                                                                                                                                                                     | 07   |
|                                                                                           | ( ક ) | ક$%&ટની હGLYPH<c=17,font=/QTBAAA+ShrutiRegular> રફGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ર  ન ી   T ુદ&Tુદ& ર&તો સમEવો.                                                                                                                                                                                                                             | ૦૭   |
| Q.3                                                                                       | (a)   | Explain permeability of concrete.                                                                                                                                                                                                                                                                                                            | 03   |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૩     | ( અ ) | ક$%&ટની પારગ@યતા સમEવો.                                                                                                                                                                                                                                                                                                                          | ૦૩   |
|                                                                                           | (b)   | Distinguish between nominal mix and design mix.                                                                                                                                                                                                                                                                                              | 04   |
|                                                                                           | ( બ ) | સાધારણ મીU અને Kડઝાઇન મીU નો તફાવત દશાGLYPH<c=9,font=/QTBAAA+ShrutiRegular>વો.                                                                                                                                                                                                                                                                         | ૦૪   |
|                                                                                           | (c)   | Describe importance of Non-Destructive Testing (NDT) and explain rebound hammer test in detail.                                                                                                                                                                                                                                              | 07   |
|                                                                                           | ( ક ) | નોન ડ&?Rકટ&વ ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટXગના મહ1વ િવશે જણાવો અને ર&બાઉGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ડ હGLYPH<c=17,font=/QTBAAA+ShrutiRegular>મર ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટ િવગતવાર સમEવો.                                                                                                                          | ૦૭   |
|                                                                                           |       | અથવા OR                                                                                                                                                                                                                                                                                                                                       |      |
| Q.3                                                                                       | (a)   | Describe the methods of testing of hardened concrete.                                                                                                                                                                                                                                                                                        | 03   |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૩     | ( અ ) | સખત ક$%&ટ માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ના ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>?ટ .  વણGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ન   કરો.                                                                                                                                                                                              | ૦૩   |
|                                                                                           | (b)   | Write the names of different methods for concrete mix design.                                                                                                                                                                                                                                                                                | 04   |
|                                                                                           | ( બ ) | ક$%&ટ મીU Kડઝાઇન માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ની િવિવધ ર&તોના નામ લખો.                                                                                                                                                                                                                                                                     | ૦૪   |
|                                                                                           | (c)   | Following observations were taken for compressive strength test on concrete cubes in N/mm². Find mean strength, standard deviation and coefficient of variance. 24,23,21,25,28,27,22,26,24,27                                                                                                                                                | 07   |
|                                                                                           | ( ક ) | ક$%&ટ Qુબની કો@પેસીવ ?RGLYPH<c=17,font=/QTBAAA+ShrutiRegular>GLYPH<c=20,font=/QTBAAA+ShrutiRegular>થ  મેળવીને નીચેના પKરણામો GLYPH<c=30,font=/QTBAAA+ShrutiRegular>ાYત થાય છે  .તો તે                                                                                                                                                                          | ૦૭   |
|                                                                                           |       | પKરણામો ઉપરથી મીન ?RGLYPH<c=17,font=/QTBAAA+ShrutiRegular>GLYPH<c=20,font=/QTBAAA+ShrutiRegular>થ , ?ટાGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ડડ GLYPH<c=9,font=/QTBAAA+ShrutiRegular>   ડ GLYPH<c=17,font=/QTBAAA+ShrutiRegular>િવ એ શ ન ,  અ ન ે  કોKફિશ ય GLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ  ઓ ફ  વ ેર&એ શ ન શોધો. ૨૪,૨૩,૨૧,૨૫,૨૮,૨૭,૨૨,૨૬,૨૪,૨૭ |      |
| Q.4 GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૪ | (a)   | What are the functions of following admixtures: (i)Air entraining agent (ii)Accelerators                                                                                                                                                                                                                                                     | 03   |

અ

|                                                                                       | ( )   | નીચેના એડિમકસચસGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ના કાય8 લખો:                                                                                                                                                                                                                                                                     |    |
|---------------------------------------------------------------------------------------|-------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----|
|                                                                                       |       | (i)એર એGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટરXગ એજGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ                                                                                                                                                                                                                                   |    |
|                                                                                       |       | (ii)એકસેલેરGLYPH<c=17,font=/QTBAAA+ShrutiRegular> ટસ GLYPH<c=9,font=/QTBAAA+ShrutiRegular>                                                                                                                                                                                                                                      |    |
|                                                                                       |       | (iii)પોઝોલાના                                                                                                                                                                                                                                                                                                                     |    |
|                                                                                       | (b)   | Enlist remedial measures to prevent corrosion of reinforcement steel.                                                                                                                                                                                                                                                         | 04 |
|                                                                                       | ( બ ) | રGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ઈનફોસGLYPH<c=9,font=/QTBAAA+ShrutiRegular>મ ેGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ  ?ટ& લ ન ે  કા ટ  લ ાગ ત ો રોકવાના ઉપાયો સમE વો.                                                                                                                                                              | ૦૪ |
|                                                                                       | (c)   | Give flow chart of mix design steps.                                                                                                                                                                                                                                                                                          | 07 |
|                                                                                       | ( ક ) | મીU Kડઝાઇનની ગણતર&નો bલોચાટGLYPH<c=9,font=/QTBAAA+ShrutiRegular> દોરો.                                                                                                                                                                                                                                                                | ૦૭ |
|                                                                                       |       | અથવા OR                                                                                                                                                                                                                                                                                                                        |    |
| Q.4                                                                                   | (a)   | Give advantages of Ready Mixed Concrete.                                                                                                                                                                                                                                                                                      | 03 |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૪ | ( અ ) | રGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ડ&મીU ક$%&ટના ફાયદા જણાવો.                                                                                                                                                                                                                                                                   | ૦૩ |
|                                                                                       | (b)   | Enlist causes of corrosion of reinforcement steel.                                                                                                                                                                                                                                                                            | 04 |
|                                                                                       | ( બ ) | રGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ઈનફોસGLYPH<c=9,font=/QTBAAA+ShrutiRegular>મ ેGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ  ?ટ& લ ન ે  કા ટ  લ ાગ વ ાન ા > ુ Jય કારણો સમE વો.                                                                                                                                                           | ૦૪ |
|                                                                                       | (c)   | It is required to design a concrete mix proportion for M25 grade of concrete as per IS 10262-2019,required test result data is given below. (i)Type of exposure: moderate                                                                                                                                                     | 07 |
|                                                                                       |       | (ii)Minimum cement content:340Kg per m 3  of concrete (iii)Zone of fine aggregate is III (iv)Maximum size of coarse aggregate is 20mm (v)Specific Gravity of Fine Aggregate:2.67 (vi) Specific Gravity of Coarse Aggregate:2.74 (vii)Usage of admixture is not allowed (viii)slump-100mm (ix)Maximum water content ratio-0.50 |    |
|                                                                                       | ( ક ) | IS 10262-2019 અ.ુસાર M25 :ેડ ક$%&ટ માટGLYPH<c=17,font=/QTBAAA+ShrutiRegular> ક$%&ટિમIણના GLYPH<c=30,font=/QTBAAA+ShrutiRegular>માણે Kડઝાઇન                                                                                                                                                                                             | ૦૭ |
|                                                                                       |       | કરવાની આવlયકતા છે, આવlયક પર&Uા ડGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ટા નીચે > ુજબ છે. (i)એAસપોઝર નો GLYPH<c=30,font=/QTBAAA+ShrutiRegular>કાર:મmયમ                                                                                                                                                                                       |    |
|                                                                                       |       | (ii)GLYPH<c=20,font=/QTBAAA+ShrutiRegular>B ૂ નતમ િસમેGLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટ સામ:ી: 340Kg per m 3  ક$K%ટ (iii)ફાઈન એ:ીગેટ ઝોન III છે (iv)કોષGLYPH<c=9,font=/QTBAAA+ShrutiRegular>  એ : ીગ ેટ મહતમ કદ20mm છે                                                                                                                |    |
|                                                                                       |       | (v)ફાઈન એ:ીગેટ ચોxસ 7ુyુ1વાકષGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ણ: 2.67                                                                                                                                                                                                                                                            |    |
|                                                                                       |       | (vi)કોષGLYPH<c=9,font=/QTBAAA+ShrutiRegular>  એ : ીગ ેટ ચોxસ 7 ુ y ુ 1વાકષGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ણ: 2.74                                                                                                                                                                                                               |    |
|                                                                                       |       | (vii)એડિમકચસGLYPH<c=9,font=/QTBAAA+ShrutiRegular>નો ઉપયોગ કરવાની મ ં Tૂર& નથી. (viii)?લમપ: 100mm                                                                                                                                                                                                                                      |    |

(ix)મહતમ પાણી -િસમેGLYPH&lt;c=20,font=/QTBAAA+ShrutiRegular&gt;ટ રGLYPH&lt;c=17,font=/QTBAAA+ShrutiRegular&gt; િશ ય ો :0.50

| Q.5                                                                                   | (a)   | Define:Repair,Rehabilitation and Retrofitting                                                                                                         | 03   |
|---------------------------------------------------------------------------------------|-------|-------------------------------------------------------------------------------------------------------------------------------------------------------|------|
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૫ | ( અ ) | |યાJયા આપો:ર&પેર,ર&હGLYPH<c=17,font=/QTBAAA+ShrutiRegular>બી}લટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>શન અને રGLYPH<c=17,font=/QTBAAA+ShrutiRegular> Rોફ&ટXગ. | ૦૩   |
|                                                                                       | (b)   | Describe Guniting or Shortcreting.                                                                                                                    | 04   |
|                                                                                       | ( બ ) | ગનાઈટXગ અથવા સોટK%Kટગ સમEવો.                                                                                                                              | ૦૪   |
|                                                                                       | (c)   | Explain Fiber Reinforced Concrete.                                                                                                                    | 07   |
|                                                                                       | ( ક ) | ફાઈબર રGLYPH<c=17,font=/QTBAAA+ShrutiRegular> ઈ ન ફોસGLYPH<c=9,font=/QTBAAA+ShrutiRegular>ડ GLYPH<c=9,font=/QTBAAA+ShrutiRegular>   ક$%& ટ  સ મ E વ ો.   | ૦૭   |
|                                                                                       | અથવા   | અથવા                                                                                                                                                   | અથવા  |
|                                                                                       | OR    | OR                                                                                                                                                    | OR   |
| Q.5                                                                                   | (a)   | List journals available in the field of concrete technology.                                                                                          | 03   |
| GLYPH<c=1,font=/QEBAAA+BalooBhai2Regular> GLYPH<c=2,font=/QEBAAA+BalooBhai2Regular> ૫ | ( અ ) | ક$%&ટ ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>કન ોલ ો~ ના Uે મા ં ઉપલધ સામિયકોની યાદ& આપો.                                                                                                                                                       | ૦૩   |
|                                                                                       | (b)   | Write a short note on:3D printed concrete.                                                                                                            | 04   |
|                                                                                       | ( બ ) | ૂંકન$ધ લખો: 3D િGLYPH<c=30,font=/QTBAAA+ShrutiRegular>GLYPH<c=20,font=/QTBAAA+ShrutiRegular>ટGLYPH<c=17,font=/QTBAAA+ShrutiRegular>ડ  ક$%& ટ                                                                                                                                                       | ૦૪   |
|                                                                                       | (c)   | Enlist various repair materials and explain any two in detail.                                                                                        | 07   |
|                                                                                       | ( ક ) |                                                                                                                                                       | ૦૭   |

િવિવધ GLYPH&lt;c=30,font=/QTBAAA+ShrutiRegular&gt; કારન ા ર&amp;પેર મKટKરયલની યાદ&amp; કરો અને કોઈ પણ બે સમEવો.

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