Reg. No.
B.E. B.Tech. DEGREE EXAMINATION, MAY 2017
Elective
Civil Engineering
01UCE908 CONCRETE TECHNOLOGY
(Regulation 2013)
Duration: Three hours Maximum: 100 Marks
Answer ALL Questions
PART A (10 x 2 20 Marks)
1. What is the role of C3S and C3A on the properties of cement?
2. What is Gap Graded Aggregate?
3. Define accelerators.
4. How plasticizers are important for concrete?
5. Distinguish between Plasticizers and Superplasticizers.
6. What are the factors affecting choice of concrete mix design?
7. How does water cement ratio affect the strength of concrete?
8. What is Abram's law? Explain the factors affecting the compressive strength of concrete. 9. Define classification of light weight concrete. 10. Define aspect ratio.
PART B x 16 80 Marks)
11. Explain various tests to be done on coarse and fine aggregates.
Or
Explain the use and chemical composition of following cements: Quick setting Cement Sulphate resisting Cement Low heat Cement Portland Pozzolana Cement.
Question Paper Code: 31181
2
31181
12. Define Admixtures. Enlist the different types mineral admixtures used in concrete. Describe briefly the influence of three most important mineral admixtures on concrete.
Or
Explain the mechanism of action and advantages of following chemical admixtures in concrete: Retarders Accelerators Water proofers.
13. Compare the salient features of the BIS, ACI and DOE methods of concrete mix-design.
Or
Design a concrete mix by BIS method with the following data:
Characteristic compressive strength 35 N/m2
Maximum size of aggregate 20 mm (angular)
Fine aggregates confirm to grading zone II
Degree of workability 0.80
Degree of quality control good
Type of exposure mild
Specific gravity of cement-3.14
Specific gravity of fine aggregate-2.58
Water absorption
Coarse aggregate-Nil
Fine aggregate-1.9%
Water cement ratio-0.48
Assume any other data if necessary.
14. Explain the lab tests to determine the tensile strength of concrete and write comments on the tensile strength value obtained from these tests.
Or
Discuss factors influence strength of hardened concrete.
15. What is high performance concrete? Describe the tests to be performed to check the acceptability of any one high Performance concrete.
Or
What is Geo polymer concrete? Discuss the parameter involved in the producing of Geo polymer concrete.