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Test: Concrete Mix Design - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Construction Materials & Management - Test: Concrete Mix Design

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

The _________ compressive strength required from structural consideration.

Detailed Solution for Test: Concrete Mix Design - Question 1

Option d can be eliminated easily because we need atleast some compressive strength. The minimum compressive strength required from structural consideration.

Test: Concrete Mix Design - Question 2

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: Concrete Mix Design - Question 2

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: Concrete Mix Design - Question 3

The adequate workability necessary for _________ compaction with the compacting equipment available.

Detailed Solution for Test: Concrete Mix Design - Question 3

Option d can be eliminated easily because double compaction is not possible. The adequate workability necessary for full compaction with the compacting equipment available.

Test: Concrete Mix Design - Question 4

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

Detailed Solution for Test: Concrete Mix Design - Question 4

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: Concrete Mix Design - Question 5

______ water-cement ratio content to give adequate durability for the particular site conditions.

Detailed Solution for Test: Concrete Mix Design - Question 5

Maximum water-cement ratio and/or maximum cement content to give adequate durability for the particular site conditions. It helps to avoid shrinkage cracking due to temp cycle in mass concrete.

Test: Concrete Mix Design - Question 6

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: Concrete Mix Design - Question 6

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

Test: Concrete Mix Design - Question 7

______ cement content to avoid shrinkage cracking due to temperature cycle in mass concrete.

Detailed Solution for Test: Concrete Mix Design - Question 7

Maximum cement content to avoid shrinkage cracking due to the temperature cycle in mass concrete. It gives adequate durability for the particular site condition.

Test: Concrete Mix Design - Question 8

The pH value of water used in making concrete should be in the range of:

Detailed Solution for Test: Concrete Mix Design - Question 8

The pH value of water for making reinforced cement concrete should be between 6 to 8.5.
Important properties of water for concrete:

  • The pH value must not be less than 6.
  • The presence of salts of manganese, tin, zinc, copper, and lead causes a reduction in strength.
  • The presence of sugar causes retardation in the setting.

Important Points
The permissible limit for solids as per IS 456 of 2000:

Test: Concrete Mix Design - Question 9

______ has designated the concrete mixes into a number of grades as M10, M15.

Detailed Solution for Test: Concrete Mix Design - Question 9

IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40.

Test: Concrete Mix Design - Question 10

For cylindrical concrete specimens, the number of strokes when compacting by hand is not less than ___________ to perform the compression test of concrete in the laboratory.

Detailed Solution for Test: Concrete Mix Design - Question 10

Compressive Strength Test of concrete:
According to IS: 516 (1959),
(Case 1)

  • The concrete of 150×150 mm size is compacted with 35 strokes per layer

(Case2) 

  • Concrete of 100×100 mm size is compacted with 25 strokes per layer.

For testing the compressive strength we generally use, 150 mm size cube. So, we have to go for 35 in this particular question. 

Additional Information

  • Test specimens should be stored at a temperature of 27 ± 3 ℃ at 90% humidity for 24 ± 1/2 hours from the time of addition of water. After this time, specimens are removed from mould and placed in water and taken out just before the test.
  • After 28 days or 7 days of curing, the specimen is placed in a compression testing machine which applies a gradual load of 14 MPa per minute.
  • The average of three values is taken as the compressive strength of concrete, provided that individual variation is not more than ± 15% of the average.
  • 7 days compressive strength = 2/3 of 28 days compressive strength.
  • Cube strength = 1.25 cylindrical strength.
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