Question

In order to determine the workability of a concrete mixture, the recommended tests are: (A) Flow test
(B) Compaction Factor test
(C) Flexural strength test
(D) Slump test
Choose the correct answer from the options given below:

• A. (B), (C) and (D) only
• B. (A), (B) and (C) only
• C. (A), (B), (C) and (D)
• D. (A), (B) and (D) only

Hint:

The Compaction Factor and Slump tests are the standard methods for evaluating the workability of concrete mixtures.

Answer 1

The Correct Option is A

Step 1: Workability of Concrete Mixture.
The workability of concrete refers to how easily the concrete can be mixed, placed, and finishe(D) Various tests are conducted to measure this property.

Step 2: Analysis of the Tests.
- (A) Flow test: This test is used to measure the flow of a concrete mixture, which relates to its workability. While important, it is not typically one of the most common tests used for workability in concrete mixtures.
- (B) Compaction Factor test: This test is one of the standard methods to assess the workability of concrete, particularly when the concrete is dense and not easily worke(D)
- (C) Flexural strength test: This test is used to assess the strength of concrete when it is subjected to bending forces. It is not a direct measure of workability.
- (D) Slump test: This is one of the most widely used tests to measure the consistency and workability of concrete, particularly in fresh concrete.

Step 3: Conclusion.
The most common tests for determining workability include the Compaction Factor test and the Slump test. The Flexural strength test is not used to assess workability, making option 1 the correct answer.

Final Answer: \[ \boxed{1. \, (B), (C) \, \text{and} \, (D) \, \text{only.}} \]