GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- IV EXAMINATION — SUMMER 2020
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Subject Code: 2140608 Date:04/11/2020Subject Name: Concrete Technology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) State chemical composition of Ordinary Portland cement. 03
(b) Differentiate between setting and hardening of cement. 04
(c) State major Bogue’s compounds, its abbreviations and discuss its properties. 07
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Q.2 (a) Describe Aggregate Crushing value test on coarse aggregate. 03
(b) Discuss the quality of water for making concrete and state limiting values of impurities as recommended by IS 456:2000. 04
(c) Describe the test for determination of initial and final setting time of cement. 07
State IS requirements for setting time for OPC.
OR
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(c) Discuss importance of grading of aggregate. Explain gap graded, well graded, uniformly graded and poorly graded aggregate with the help of grading curves. 07
Q.3 (a) List different methods for curing of concrete and explain anyone in detail. 03
(b) Explain segregation and bleeding. How it can be controlled? 04
(c) List the factors affecting workability of concrete and explain any three of them. 07
OR
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Q.3 (a) Explain the terms Shrinkage, Creep and Modulus of Elasticity of concrete. 03
(b) Discuss the effect of water cement-ratio on the strength of Concrete. 04
(c) Enlist different tests for hardened concrete. Explain Split cylinder test. 07
Q.4 (a) Explain alkali aggregate reaction. State factors promoting it. 03
(b) What do you understand by durability of concrete? Enlist factors affecting durability of concrete. Explain any one in brief. 04
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(c) Describe slump test for measurement of workability. How the test results are interpreted? 07OR
Q.4 (a) State acceptance criteria of concrete as per 1S456:2000 03
(b) Describe in detail fiber reinforced concrete. 04
(c) Define nominal mix and design mix concrete. Describe step by step procedure of IS method of mix design. 07
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Q.5 (a) Discuss polymer concrete. 03
(b) Write short note on cold weather concreting. 04
(c) Define admixture and state uses of any three admixtures in concrete. 07
OR
Q.5 (a) Discuss different methods of transporting fresh concrete. 03
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(b) Explain effect of plasticizers on properties of concrete. 04(c) List various Non-Destructive tests for assessing the strength of concrete. 07
Explain Rebound Hammer test.
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