GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (OLD) EXAMINATION — WINTER 2018
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Subject Code:130605 Date:10/12/2018Subject 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) List out the raw materials required for making cement. 07
Explain any one process of manufacturing of cement in detail.
(b) Write a short note on quality of mixing water to be used for various processes of concreting. 07
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Q.2 (a) Give the detailed classification of the aggregates. 07
(b) Define Standard Consistency of Cement. Explain the test procedure to find the same and also state its importance. 07
OR
(b) Describe any two test methods to determine the physical strength of aggregates in detail 07
Q.3 (a) Enlist various types of admixtures and their relevant application. 07
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(b) Define Workability of concrete. Explain the various factors that influence workability 07OR
Q.3 (a) Explain in detail the need for curing of concrete structures. 07
Explain in brief the various methods of curing.
(b) Write down the various steps of Concrete mix design as per IS method 07
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Q.4 (a) In detail explain various factors that affect the hardened strength of concrete. 07
(b) Specify the difference between destructive and non-destructive testing. State the principle and limitations of Rebound Hammer test, Ultra sonic pulse velocity test. 07
OR
Q.4 (a) Explain various Laboratory and Physical tests conducted on cement. Explain the test procedure to determine the compressive strength of cement 07
Q.4 (b) Describe the sizes of the different moulds used for performing various tests on hardened concrete. Compare concrete cube strength & cylinder strength. 07
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Q.5 (a) Explain the importance of compaction of the freshly placed concrete. Enlist different types of vibrators used for compaction. 07
(b) Describe in detail about Mass concrete and Underwater concreting technique. 07
Q.5 (a) Write short notes on the following (any four) 14
- Fly-ash as an admixture
- Alkali — aggregate reaction
- Causes of cracks in concrete structures
- Fibre reinforced concrete
- Factors affecting the durability of concrete
- Grading of aggregates
- Segregation and Bleeding
- Moisture conditions of aggregates
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