Item 311

What property of concrete is adversely affected by air-entrainment admixture?

Consistency

Watertightness

Workability

Strength

Durability

Cold joint is constructed when there is an interruption of __________ in the concreting operation.

60 min.

45 min.

30 min.

90 min.

The maximum size of coarse aggregates to be used in Item 311.

25 mm, Grading “B”

50 mm, Grading “C”

75 mm, Grading “A”

63 mm, Grading “D”

What is the primary Quality Control / Mechanism for the production of concrete mixture?

Type of cement

Design Mix

Job-Mix formula

Flexural Strength

Admixtures

Slump test is a very important test in fresh concrete to determine __________?

Quality of concrete

Consistency

Workability

Durability

Consistency and Workability

Workability and Durability

Concrete beam sample when tested by Third-Point Method shall have a flexural strength of __________ when tested @ 14 days. (Mpa)

4.5

4.8

3.8

3.5

If slag is used as coarse aggregate in Item 311, the minimum density is __________.

1140 kg/m3

1220 kg/m3

1120 kg/m3

1210kg/m3

The diameter of Wire Mesh in lateral and longitudinal directions shall not be less than __________ and the weight shall not be less than __________.

6.5 mm, 3 kg/m2

7.0 mm, 3.10kg/m2

6.0 mm, 3 kg/m2

7.5 mm, 4 kg/m2

If the concrete pavement is well cured at any particular age, the most important single factor affecting the strength is __________.

cement factor

the well-graded aggregates

water-cement ratio

non-provision of admixtures

curing

The concrete in the area represented by the cores will be considered adequate if the average strength of the cores is equal to at least _____ of the specified strength, and if no single core is less than _____ of the specified strength.

80%, 70%

85%, 70%

85%, 75%

80%, 75%

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