Common Civil Engineering interview questions for freshers
In this article i discussed important civil engineering interview questions.
What is the Bleeding of Concrete?
Ans. Separation of water or water-cement mixture from the concrete.
What is the Segregation of concrete?
Ans. Separation of aggregates from the concrete mixture.
How workability of concrete varies with the grading of concrete?
Ans. The workability of the concrete is directly proportional to the grading of the aggregate.
How workability of the concrete varies with the time of transit?
Ans. The workability of the concrete is inversely proportional to the time of transit.
What is the approximate value of the shrinkage strain?
Ans. The approximate value of shrinkage strain is 0.0003.
What happens to the workability of concrete with air entrainment?
Ans. Air entrainment in the concrete increases workability.
What happens to the strength of concrete on increasing the fineness of cement?
Ans. Strength of the concrete increases with an increase in fineness of cement.
Write the formula used to calculate the characteristic strength of the concrete.
Ans. The characteristic strength of concrete is given by 0.7 (fck)^(1/2).
Two sizes of concrete testing cube are available one of 100mm side and the other of 150mm size, which gives higher values of the compressive strength
Ans. The compressive strength of the 100mm cube is more compared to the 150mm cube.
How you can calculate the modulus of elasticity?
Ans. The modulus elasticity of concrete is 5700(fck)^(1/2).
What happens to the strength of concrete with an increase in moisture concrete?
Ans. An increase in moisture content in concrete reduces its strength of concrete.
What happens to the setting of the concrete with the addition of the accelerator?
Ans. Due to the addition of accelerator rate of setting and hardening increases.
What happens to concrete with the addition of gypsum?
Ans. Setting time increases.
What % of voids are present in cement?
Ans. The percentage of voids in cement is approximately 40%.
What was the increase in the strength of concrete after one year as compared to 28 days?
Ans. The strength of concrete after one year as compared to the 28 days is 20 to 25% more.
What does the modulus of rupture of concrete represent?
Ans. The modulus of rupture of concrete is the measure of flexural tensile strength.
Which shape of Aggregate has best workability among rounded and angular ?
Ans. The best is workability given by rounded shape aggregates.
At what % of moisture content bulking of sand is maximum?
Ans. Bulking of sand is maximum if moisture content is about 4%.
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