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1
Design a concrete mix for M30 grade of concrete for severe exposure condition
for RCC work as per IS:10262-1982 for 1 bag of cement for the following data.
Maximum size of aggregate (Angular) : 20 mm
Water-Cement ratio : 0.48
Specific gravity of Cement : 3.10
Specific gravity of Fine Aggregate : 2.6
Specific gravity of Coarse aggregate : 2.65
Water Absorption of Fine Aggregate : Nil
Water Absorption of Coarse aggregate : 0.50%
Free surface moisture on Fine Aggregate: 1%
Compaction Factor :0.85 Targeted Slump: 50 mm
Sand Zone: III Take standard deviation: 5
and Tolerance factor: 1.65
Use Table 1 to 4.
Maximum size of aggregate (Angular) : 20 mm
Water-Cement ratio : 0.48
Specific gravity of Cement : 3.10
Specific gravity of Fine Aggregate : 2.6
Specific gravity of Coarse aggregate : 2.65
Water Absorption of Fine Aggregate : Nil
Water Absorption of Coarse aggregate : 0.50%
Free surface moisture on Fine Aggregate: 1%
Compaction Factor :0.85 Targeted Slump: 50 mm
Sand Zone: III Take standard deviation: 5
and Tolerance factor: 1.65
Use Table 1 to 4.
14 M
Answer following questions in short.
2 (a) 1
Why gypsum is added during the process of manufacturing of Cement?
1 M
2 (a) 2
What is the effect of size of aggregate on workability?
1 M
2 (a) 3
What is the effect of Water cement ratio on compressive strength of
Concrete?
1 M
2 (a) 4
Define fineness modulus.
1 M
2 (a) 5
Give the value of initial and final setting time for OPC cement.
1 M
2 (a) 6
What is the allowable maximum w/c ratio for RCC?
1 M
2 (a) 7
Which property of cement is measured by Soundness test?
1 M
2 (b)
Enlist different types of Chemical and Mineral admixture. Explain any one of
each in detail.
7 M
2 (c)
Explain dry process for manufacturing of cement.
7 M
3 (a)
Define workability. Enlist the test for measurement of workability. Explain
compaction factor test.
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3 (b)
What is NDT? Explain ultrasonic pulse velocity test in detail.
7 M
3 (c)
Define standard consistency of cement. Explain test for compressive strength of
Cement.
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3 (d)
Enlist the test performed on hardened concrete specimen. Explain any one in
Detail.
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4 (a)
Write short note on segregation and bleeding.
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4 (b)
Explain factors affecting hot weather concreting.
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4 (c)
Write short note on permeability of concrete. Explain factors affecting
permeability of concrete.
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4 (d)
Write short note on underwater concreting.
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5 (a)
Write short note on pumped concrete.
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5 (b)
Write short note on alkali aggregate reaction and sulfate attack.
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5 (c)
Enlist different repairing materials. Explain repairing techniques for concrete.
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5 (d)
Define flakiness and elongation index of aggregate. Explain aggregate impact
Test
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