Concrete Technology - June 2014

VTU Civil Engineering (Semester 4)

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) Explain the manufacturing process of OPC both by wet and dry process (using flow chart only). 10 marks

1 (b) Explain any two test on cement in detail. 10 marks

2 (a) What is grading of aggregate? Explain its significance in improving the properties of concrete. 10 marks

2 (b) What are flakiness and elongation index? Explain their effects on properties of concrete. 10 marks

2 (c) Explain impact and abrasion tests on coarse aggregate. 10 marks

3 (a) Explain measurement of workability of concrete using.
i) Compaction factor method.
ii) Vee-bee Consistometer method. 10 marks

3 (b) Explain manufacture of concrete in detail. 10 marks

4 (a) What is the role of admixtures in concrete? Mention any three chemical and mineral admixtures. 10 marks

4 (b) Explain factors affecting the workability of concrete by using admixtures. 10 marks

4 (c) Explain the role of fly ash as a admixture. 10 marks

5 (a) Explain factors affecting strength of concrete. 10 marks

5 (b) Explain flexural strength and split tensile strength tests on concrete. 10 marks

6 (a) Explain briefly the relationship between modulus of elasticity and compressive strength of concrete. 10 marks

6 (b) Explain the method of measurement of creep of concrete. 10 marks

6 (c) Explain factors affecting creep of concrete. 10 marks

7 (a) Define durability of concrete and explain its significance. 10 marks

7 (b) Explain the effects of freezing and thawing on the durability of concrete. 10 marks

7 (c) What is sulphate attack on concrete? Explain methods of controlling it. 10 marks

8 (a) Explain the concept of concrete mix design. 10 marks

8 (b) Explain the procedure of concrete mix design using I.S. code. 10 marks

8 (c) Explain different variables in proportioning of concrete. 10 marks