GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-V (NEW) EXAMINATION - WINTER 2020
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Subject Code:3150610 Date:27/01/2021Subject Name:Concrete Technology
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
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2. Make suitable assumptions wherever necessary.3. Figures to the right indicate full marks.
Q.1 (a) Briefly discuss the composition of concrete. 03
(b) Define workability and discuss factors affecting workability. 04
(c) Explain various causes of corrosion of steel in concrete and its remedial measures. 07
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Q.2 (a) Briefly explain Alkali-aggregate reaction. 03
(b) Explain the compaction factor test on concrete. 04
(c) Classify the various types of admixtures based on their application. Explain water reducing type admixtures in detail. 07
Q.3 (a) Briefly discuss the need for curing and enlist various methods of concrete curing. 03
(b) Enlist Bouge’s compounds of cement and their role in the hydration process. 04
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(c) Enlist various factors affecting the strength of concrete and explain anyone in detail. 07Q.4 (a) Differentiate between fresh concrete and hardened concrete. 03
(b) Define the permeability of concrete and enlist various factors affecting permeability. 04
(c) Explain the dry process for the manufacturing of cement. 07
Q.5 (a) Discuss segregation and bleeding of concrete briefly. 03
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(b) Discuss the effect of freezing and thawing on concrete. 04(c) Define nominal mix concrete and design mix concrete. Explain step by step procedure of the IS method of mix design. 07
Q.6 (a) Define Ferro cement briefly. 03
(b) Differentiate between high strength and high-performance concrete. 04
(c) Enlist types of fibers used in fiber reinforced concrete. Also, explain factors affecting properties of fiber-reinforced concrete. 07
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Q.7 (a) Briefly explain Gel-space ratio. 03
(b) Explain the importance of the water-cement ratio on the strength of the concrete. 04
(c) Define creep. Explain the factors affecting the creep of concrete. 07
Q.8 (a) Distinguish between the grade of cement and grade of concrete. 03
(b) List various crack repair techniques and explain them to anyone in detail. 04
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(c) Enlist the types of NDT tests for concrete. Explain the rebound hammer test in detail. 07--- Content provided by FirstRanker.com ---
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