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What C39 test under the Standard ASTM test method?

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What C39 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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Right answer is (b) Test Method for Compressive Strength of Cylindrical Specimen

The explanation is: According to Standard ASTM test methods to evaluate field-placed concrete C39 test is for Test Method for Compressive Strength of Cylindrical Specimen.

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