# Concrete Technology Questions and Answers – Tests on Workability of Fresh Concrete

This set of Concrete Technology Questions and Answers for Entrance exams focuses on “Tests on Workability of Fresh Concrete”.

1. The water–cement ratio is the ratio of _______________
a) Weight of water to the weight of cement
b) Volume of water to the volume of cement
c) Density of water to the Density of cement
d) Weight of water to the weight of aggregates

Explanation: The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix.

2. A lower ratio leads to ____________
a) Higher strength and durability
b) Higher strength but low durability
c) Lower strength but high durability
d) Lower strength and durability

Explanation: A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form.

3. Workability can be resolved __________
a) With not using of plasticizers
b) With use of plasticizers
c) With the use of both plasticizers and super plasticizers
d) With not using of both plasticizers and super plasticizers

Explanation: Plasticizers and super plasticizers helps to improve the workability to construct the building.

4. This image has _________

a) High w/c ratio
b) Low w/c ratio
c) High Strength
d) Low porosity

Explanation: It is clear vision from the image that the amount of water is more as compared to cement.

5. Which has Low porosity?

A

B
a) A
b) B
c) Both are same
d) Can’t predict

Explanation: Option A figure has low porosity because the content of water is less as compared to cement.
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6. How to improve the workability of concrete.
a) Increase the w/c ratio
b) Decrease the w/c ratio
c) Decrease the size of aggregates
d) Don’t mix it for longer time

Explanation: Increasing the water cement ratio, helps in improving the workability of the concrete.

7. What is workability?
a) When it is easily placed and compacted heterogeneous
b) When it is easily placed and compacted homogenous
c) When it is not easily placed
d) When it is easily placed but not compacted homogenous

Explanation: Concrete is said to be workable when it is easily placed and compacted homogeneously i.e without bleeding or Segregation.

8. What is the compaction factor for low degree of workability?
a) .78
b) .85
c) .92
d) .95

Explanation: The compaction factor for low degree of workability is .85 and .95 is the compaction for the high degree.

Sanfoundry Global Education & Learning Series – Concrete Technology.