Concrete Technology : Question Paper May 2014 - Civil Engineering (Semester 4)

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Concrete Technology - May 2014

Civil Engineering (Semester 4)

TOTAL MARKS:
TOTAL TIME: HOURS

1 (a) Enlist the types of cements and explain properties of PPC.(7 marks) 1 (b) Define standard consistency of cement and write the laboratory procedure for determining the same.(7 marks) 2 (a) Define initial setting time and final setting time of cement and explain the laboratory test for the same. Mention the IS limits of IST and FST of OPC.(7 marks) 2 (b) Give difference between Rapid hardening cement and Quick setting cement.(7 marks) 2 (c) Explain heat of hydration and it's importance in setting.(7 marks) 3 (a) Define aggregate and classify them according to (i) size (ii) Shape (iii) source of origin and (iv) Weight criteria.(7 marks) 3 (b) Define fineness modulus of aggregate and calculate it's value for the following test result. Explain it's utility.

IS sieve	40	20	10	4.75	2.36	1.18	0.60	0.30	0.15
% wt. Retained	5	30	50	60	80	96	99	100	100
% Passing	95	70	50	40	20	04	01	00	00

(7 marks) 3 (c) Describe effect of impurities in water on properties of concrete.(7 marks) 3 (d) Enlist the purposes of using admixture in concrete.(7 marks) 4 (a) Define workability of concrete and explain any one test to measure the workability of concrete.(7 marks) 4 (b) Explain segregation and bleeding phenomenon. Also write the causes of Segregation.(7 marks) 4 (c) Define the "Mix design" and design concrete mix M20 using following data and IS : 10262 procedure.
1. Max. size of aggregate = 20 mm
2. Degree of workability = 0.80 CF
3. Degree of quality control = good
4. Type of exposure = mild
5. w/c/ = 0.47
6. Cement used = OPC 53 grade
7. Sp. Gravity of cement =3.15, Coarse aggregate = 2.70, Fine aggregate =2.65
8. Water absorption of Coarse aggregate = 0.5 %, Fine aggregate = 1.0 %
9. Free moisture in C. A. = 0.0 % , F. A. = 0.0 %
10. Bulk density of Cement = 1440, C. A. = 1650, F.A. = 1800 kg/m³(7 marks) 5 (a) Write note on NDT and it's utility(7 marks) 5 (b) Write note on (i) Hot weather concreting (ii) Recycled aggregate concrete.(7 marks) 5 (c) State causes and precautions for distress in structures.(7 marks) 5 (d) Explain with sketch crack repair by injection grouting.(7 marks)

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