# Concrete Technology Questions and Answers – Measurement of Workability

This set of Concrete Technology Multiple Choice Questions & Answers (MCQs) focuses on “Measurement of Workability”.

1. How many types of tests are there to find workability?
a) 3
b) 4
c) 5
d) 6

Explanation: There are 5 types of test to find the workability of a concrete i.e. slump test, compacting factor test, flow table test, vebe test, Kelly ball test.

2. These test find workability __________
a) Directly
b) Indirectly
c) 0
d) Equals to the weight of the cement

Explanation: Unfortunately, there are no accepted tests, which can measure directly the workability.

3. Workability of concrete is measured by __________
a) Vicat apparatus test
b) Slump test
c) Minimum void method
d) Talbot Richard test

Explanation: Work ability of concrete is measured by slump cone test, compaction factor test. Slump cone is used for medium work ability. For high work abilities it is not accurate.Slump values vary from 0 mm to 300 mm.

4. Which test gives good results for rich mixes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test

Explanation: This is a test used extensively in site work all over the world. Very useful in detecting variations in the uniformity of a mix of given nominal proportions.

5. Which test used for low workable concretes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test

Explanation: The degree of compaction, called compacting factor, is measured by the density ratio, i.e. the ratio of the density of actually achieved in the test to the density of the same concrete fully compacted.

6. Which test Used for high workable concretes?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test

Explanation: Compacting factor test used for high workable concretes. It measures the diameter of spread after vibration.

7. Which test used for fiber reinforced concrete?
a) Slump test
b) Compacting factor test
c) Flow table test
d) VeBe test

Explanation: Start time after removing cone and stop counter once the transparent rider is covered with paste. Record in seconds. This is VeBe time.

8. ___________ is practical in field test.
a) Slump test
b) Compacting factor test
c) Flow table test
d) Kelly Ball Test

Explanation: It measures the depth of penetration. Kelly Ball Test is practical in field test.

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

Explanation: The compaction factor for medium degree of workability is .92 and .78 is the compaction for a very low degree.

10. What is the Vee-Bee time for medium degree of workability?
a) 10-20 sec
b) 5-10 sec
c) 2-5 sec
d) 35 sec

Explanation: 2-5 sec is the Vee-Bee time for the medium degree of workability and 10-20 sec is for very low.

Sanfoundry Global Education & Learning Series – Concrete Technology.

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