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The sample of concrete for use in making the slump test must be obtained in accordance with ASTM Standard _____.

a) C1064
b) D456
c) E789
d) B642

Answer :

Final answer:

The correct ASTM standard for obtaining the sample of concrete for the slump test is C1064, which deals with the temperature of freshly mixed hydraulic-cement concrete.

Explanation:

The correct answer to this question is a) C1064. This standard pertains specifically to the temperature of freshly mixed hydraulic-cement concrete, which is a crucial variable in preparing the concrete for various tests, including the slump test.

Understanding this ASTM standard is essential for professionals in the field to ensure the reliability and accuracy of the slump test results. The slump test itself is a simple, empirical test that measures the workability or consistency of fresh concrete before it sets.

It is worth noting that ASTM International (formerly known as American Society for Testing and Materials) develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services, including those in the concrete and cement industry.

Among these, ASTM C1064 sets the guideline for measuring the temperature of fresh concrete, which can impact its workability, setting time, and final strength. Misidentifying or overlooking the significance of adhering to ASTM standards can impair the structural integrity of construction projects and lead to costly rectifications. Hence, compliance with such standards is not only a mark of professionalism but also a requisite for ensuring construction quality and safety.

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