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What C31 test under the Standard ASTM test method?

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What C31 test under the Standard ASTM test method?

(a) Test Method for Making and Curing Concrete Test Specimens in the Field

(b) Test Method for Compressive Strength of Cylindrical Specimen

(c) Test Method for Unit Weight, Yield, and Air Content (Gravimetric) of Concrete

(d) Test Method for Slump of Hydraulic Cement Concrete

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I'd like to ask this question from Flaws in Concrete and Remedial Measures, Quality of Concrete topic in division Quality Control of Concrete Technology

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The correct choice is (a) Test Method for Making and Curing Concrete Test Specimens in the Field

To explain: According to Standard ASTM test methods to evaluate field-placed concrete C31 test is for Test Method for Making and Curing Concrete Test Specimens in the Field.

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