Correct Answer:
Increase hardening and strength development rates
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What does absolute volume refer to in concrete?
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Correct Answer:
The actual volume occupied by the different ingredients
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What is Abrasion?
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Correct Answer:
The process of wearing down or rubbing away by means of friction.
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What is Abrams' law in relation to concrete?
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Correct Answer:
Concrete strength is inversely related to the ratio of water to cement
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To obtain cement dry powder, lime stones and shales or their slurry, is burnt in a rotary kiln at a temperature between
Answer
Correct Answer:
1400 and 1500 C
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Proper proportioning of concrete, ensures
Answer
Correct Answer:
Desired strength and workability
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The ratio of the length to breadth of a wooden float, is
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Correct Answer:
7.5
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The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
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Correct Answer:
15 kg/cm2
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According to I.S. : 456, the number of grades of concrete mixes, is
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Correct Answer:
7
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The mixture of different ingredients of cement, is burnt at
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Correct Answer:
1400 C
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Internal friction between the ingredients of concrete, is decreased by using
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Correct Answer:
More water and coarse aggregates
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Vicat's apparatus is used for
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Correct Answer:
Consistency test
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If 20 kg of coarse aggregate is sieved through 80 mm, 40 mm, 20 mm, 10 mm, 4.75 mm, 2.36 mm, 1.18 mm, 600 micron, 300 micron and 150 micron standard sieves and the weights retained are 0 kg, 2 kg, 8 kg, 6 kg, 4 kg respectively, the fineness modulus of the aggregate, is
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Correct Answer:
7.35
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Workability of concrete is measured by
Answer
Correct Answer:
Slump test
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The high strength of rapid hardening cement at early stage, is due to its
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Correct Answer:
Increased lime cement
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An aggregate is said to be flaky if its least dimension is less than
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Correct Answer:
3/5th of mean dimension
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Permissible compressive strength of M 300 concrete grade is
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Correct Answer:
300 kg/cm2
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The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary method of proportioning
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Correct Answer:
1 : 4 : 10
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Workability improved by adding
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Correct Answer:
Air-entraining agent
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The maximum amount of dust which may be permitted in aggregates is
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Correct Answer:
5% of the total aggregates for low workability with a coarse grading
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For quality control of Portland cement, the test essentially done is
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Correct Answer:
All these
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The risk of segregation is more for
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Correct Answer:
All these
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For road pavements, the cement generally used, is
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Correct Answer:
Rapid hardening cement
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The increased cohesiveness of concrete, makes it
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Correct Answer:
Less liable to segregation
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