Civil Engineering MCQs

Page No. 263

Air entrainment in the concrete increases________________?


aworkability

✓


b strength

✖


cthe effects of temperature variations

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d the unit weight

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View Answer workability

The relation between modulus of rupture fcr, splitting strength fcs and direct tensile strength fcl is given by_______________?


atcr – rcs = tct

✖


bfcr>fcs>fc

✓


cfcr

✖


d fc5>fcr>fC

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View Answer fcr>fcs>fc

The approximate value of the ratio between direct tensile strength and flexural strength is_____________?


a0.33

✖


b0.5

✓


c0.75

✖


d1.0

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View Answer 0.5

The relation between modulus of rupturefcr and characteristic strength of concrete fck is given by_______________?


afcr=0.35Vf7

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bfcr=0.57f7

✖


cfcr=0.7Vf7

✓


dfcr=1.2Vf7

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View Answer fcr=0.7Vf7

Increase in the moisture content in concrete_________________?


areduces the strength

✓


bincreases the strength

✖


cdoes not change the strength

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dall of the above

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View Answer reduces the strength

Admixtures which cause early setting, and hardening of concrete are called_______________?


aworkability admixtures

✖


baccelerators

✓


cretarders

✖


dair entraining agents

✖


View Answer accelerators

The strength of concrete after one year as compared to 28 days strength is about_______________?


a10 to 15% more

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b15 to 20% more

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c20 to 25% more

✓


d25 to 50% more

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View Answer 20 to 25% more

The most commonly used admixture which prolongs the setting and hardening time is_______________?


agypsum

✓


bcalcium chloride

✖


csodium silicate

✖


d all of the above

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View Answer gypsum

According to IS : 456 -1978, the modulus of elasticity of concrete Ec (in N/mm2) can be taken as______________?


aEc = = 5700

✓


b Ec = = 570

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cEc = = 5700fck

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d Ec = where fck N/mm2 = 700 is the characteristic strength in

✖


View Answer Ec = = 5700

As compared to ordinary portland cement, use of pozzuolanic cement_______________?


areduces workability

✖


b increases bleeding

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cincreases shrinkage

✓


dincreases strength

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View Answer increases shrinkage

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