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Test: Properties of Concrete - Civil Engineering (CE) MCQ


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10 Questions MCQ Test RCC & Prestressed Concrete - Test: Properties of Concrete

Test: Properties of Concrete for Civil Engineering (CE) 2024 is part of RCC & Prestressed Concrete preparation. The Test: Properties of Concrete questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Properties of Concrete MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Properties of Concrete below.
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Test: Properties of Concrete - Question 1

A cylinder with diameter D, length L, and P be the compressive load applied on cylinder, then split tensile strength is given by _______.

Detailed Solution for Test: Properties of Concrete - Question 1

Splitting cylindrical test:

  • The cylindrical sample is laid horizontal and it is subjected to the compressive load in the UTM machine.
  • During this tensile stress is developed in the middle 5/6 portion of the section of the cylinder due to which its failure takes place.
  • This test gives a more uniform and accurate result.
  • The greatest advantage of this test is the same sample is used to find the compressive strength of the concrete.

The magnitude of the tensile stress is obtained by –

where, P = Applied load, D = Diameter of the cylinder, L = Length of the cylinder

Test: Properties of Concrete - Question 2

Properties of concrete can broadly be divided into:

Detailed Solution for Test: Properties of Concrete - Question 2

Based on the state of concrete, its properties vary. Concrete in the fresh state has different properties than concrete in a hardened state.

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Test: Properties of Concrete - Question 3

The accumulation of water on the outer surface of the concrete is:

Detailed Solution for Test: Properties of Concrete - Question 3

Bleeding can be good as well as bad for fresh concrete. Sometimes due to improper mixing, the water forms a thin layer on the outer surface, by oozing out through voids.

Test: Properties of Concrete - Question 4

Higher the cement content,

Detailed Solution for Test: Properties of Concrete - Question 4

Higher the cement content i.e. lower the aggregate cement ratio, higher is the strength. It improves workability also.

Test: Properties of Concrete - Question 5

Which of the below property of aggregates is not desirable?

Detailed Solution for Test: Properties of Concrete - Question 5

Aggregates should provide space for cement paste so as to lubricate the area. The parameters like texture, size, shape, grading are to be considered. Larger size, cubical, round and rough textured aggregates are preferred.

Test: Properties of Concrete - Question 6

The estimated volume of cement required to prepare 150 Cu-m of 1:2:4 concrete is _____.

Detailed Solution for Test: Properties of Concrete - Question 6

1:2:4 concrete mix denotes, 1 part of cement, 2 parts of sand, and 4 parts of coarse aggregate in that particular concrete mix.
1 m3 freshly mixed concrete corresponds to 1.54 m3 dry volume of concrete.
Calculation:
Given,
Wet volume of concrete = 150 Cum, Concrete mix = 1:2:4
1 m3 freshly mixed concrete corresponds to 1.54 m3 dry volume of concrete.
150 m3 freshly mixed concrete corresponds = 150 × 1.54 = 231 m3 dry volume of concrete
In a concrete mix of 1:2:4, Total parts = (1 + 2 + 4) = 7
In a total of 7 parts, cement volume is 1 part, i.e. 1/7
Hence, Cement volume for 231 m3 dry concrete = (1/7) × 231 = 33 m3

Test: Properties of Concrete - Question 7

The assumed value of the standard deviation for the initial calculation of target compressive strength of M25 grade of concrete, as per IS 456 – 2000 for M25 is

Detailed Solution for Test: Properties of Concrete - Question 7

The assumed value of standard deviation for initial calculations as per IS 456 – 2000 are given below in the table:

Test: Properties of Concrete - Question 8

Which of the below property of aggregates is not desirable?

Detailed Solution for Test: Properties of Concrete - Question 8

Aggregates should provide space for cement paste so as to lubricate the area. The parameters like texture, size, shape, grading are to be considered. Larger size, cubical, round and rough textured aggregates are preferred.

Test: Properties of Concrete - Question 9

How does the strength of concrete differ with age of concrete?

Detailed Solution for Test: Properties of Concrete - Question 9

It increases with increase in age. The strength measured after days, months and years shows an increase. It takes 28 days for concrete to attain full strength. However, it continues to attain strength even after 28 days.

Test: Properties of Concrete - Question 10

The accumulation of water on the outer surface of the concrete is: 

Detailed Solution for Test: Properties of Concrete - Question 10

Bleeding can be good as well as bad for fresh concrete. Sometimes due to improper mixing, the water forms a thin layer on the outer surface, by oozing out through voids.

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