GTU Civil Engineering (Semester 4)
Concrete Technology
May 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1 (a) Give specific uses of following cements:
1. Ordinary Portland Cement.
2. Rapid Hardening Cement.
3. Sulphate Resisting Cement.
4. Quick setting Cement.
8 M
1 (b) What is importance of following tests on Ordinary Portland cement and also give their I.S values 1) Setting time 2) Compressive strength 3) Soundness.
6 M

Write short note on (any two)
2 (a) 1 Maximum size of Aggregate
3 M
2 (a) 2 Plum Concrete
3 M
2 (a) 3 All in Aggregate.
3 M
2 (b) State four admixtures and give their uses.
8 M
2 (c) State adverse effect of excess use of admixtures.
8 M

3 (a) Give factors affecting workability of concrete.
7 M
3 (b) Explain how slump test is carried out in laboratory.
7 M
3 (c) Explain True slump, shear slump and Collapse with figure.
7 M
Write short note
3 (d) 1 Segregation
4 M
3 (d) 2 Bleeding
3 M

4 (a) Why curing is required? State different methods of curing.
7 M
4 (b) Explain factors affecting strength of concrete.
7 M
4 (c) Explain Alkali Aggregate Reaction. State measures to control.
7 M
4 (d) State three categories of ready mix cement (R.M.C). Explain any one in detail.
7 M

Write short note on (any two)
5 (a) 1 Rebound hammer test.
3 M
5 (a) 2 Pullout test.
3 M
5 (a) 3 Micro cracking in concrete.
3 M
5 (b) Draw flow diagram chart of concrete mix design.
8 M
5 (c) State and explain factors affecting the choice of mix design.
7 M
5 (d) Distinguish between Nominal mix and Design mix of concrete.
7 M



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