Indira Gandhi National Open University (IGNOU) 2006 B.Tech Water Resource Engineering ET - 581A Testing for Quality Control - - Question Paper
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B.Tech. Civil (Construction Management) Term-End Examination
December, 2006 ET-581(A) : TESTING FOR QUALITY CONTROL
Maximum Marks : 70
Time : 3 hours
Note : Attempt any five questions. All questions carry equal marks. Use of calculator is permitted.
7x2=14
1. Explain briefly any seven of the following
(a) Heat of hydration
(b) Arithmetic mean
(c) Population standard deviation
(d) Turbidity
(e) Initial setting time of cement
(f) Bulking of sand
(g) Bulk density
(h) True slump
(i) Aggregate impact value (j) Water cement ratio
What tests would you advise to a petty contractor to test cement at his site ? Also describe method of testing cement in tension arid compression.
What do you mean by workability of concrete ? How can it be determined using Vee Bee test and Ball penetration test ? Comment on their suitability in field situations.
2. (a)
(b)
(a) Distinguish between segregation and bleeding of concrete. Give detailed procedure for testing of concrete for bleeding.
3.
(b) Why is it important to determine chloride content in admixtures ? How can it be determined by volumetric and gravimetric methods ?
How would you determine tensile strength of concrete by ring tension test ? Discuss the effect of rate of loading and height to diameter ratio on the strength of sample.
4. (a)
(b)
5. (a)
(b)
Describe the importance of statistical methods in quality control, and acceptance criteria for concrete.
List different tests for testing of surface hardness of concrete. Describe Lok test and state merits and limitations of this test.
Describe various tests that are carried out on clay bricks.
6. (a) List various tests recommended for timber and
describe procedure of testing by any two of the
n
methods.
(b) Why do we need to test AC-sheets ? How are these
tested for their impermeability ? 7
7. Write short notes on any four of the following : 4x3 =14
(a) Water cement ratio
(b) Normal distribution curve
(c) Wearing resistance of tiles
(d) Vicat apparatus
(e) Soundness of aggregates
(f) Alkali aggregate reactivity
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