Concrete Works

Question 1

An artificial stone as a result of mixing cement, fine aggregates, coarse aggregates and water.

Answer 1

Plain concrete

Question 2

Concrete with reinforcement properly embedded in such a manner that the two materials act together in resisting compression and tension forces.

Answer 2

Reinforced concrete

Question 3

The purpose in mixing concrete is to select an optimum proportion of cement, water and aggregates, to produce a concrete mixture that will meet the following requirements:

Answer 3

a. Workability
b. Strength
c. Durability
d. Economy

Question 4

The ____ is first determined at the very first hour of mixing to meet the requirements of strength and durability.

Answer 4

water-cement ratio

Question 5

For Class A concrete, the water-cement ration id ranging from?

Answer 5

0.4-0.45

Question 6

It means the ability of the fresh concrete to fill all the voids between the steel bars and the forms without necessarily exerting much effort in tamping.

Answer 6

Workability

Question 7

Concrete Proportion of Class AA

Answer 7

1 : 1.5 : 3

Question 8

Probable Strength after 28 days
of Class AA

Answer 8

4000 - 3500 psi

Question 9

Concrete Proportion of Class A

Answer 9

1 : 2: 4

Question 10

Probable Strength after 28 days of Class A

Answer 10

3000 - 2500 psi

Question 11

Concrete Proportion of Class B

Answer 11

1: 2.5 : 5

Question 12

Probable Strength after 28 days of Class B

Answer 12

2000 - 1500 psi

Question 13

Concrete Proportion of Class C

Answer 13

1 : 3 : 6