ASTM C39/C39M-21 Compressive Strength of Cylindrical Concrete Specimens

ASTM C39/C39M-21 Compressive Strength of Cylindrical Concrete Specimens

ASTM C39/C39M-21 determines the properties of cylindrical concrete specimens. The method helps with the determination of the compressive strength of these cylindrical concrete specimens. The final results of this method are displayed keeping in view the international standards and inch-pound units.


    ASTM C39/C39M-21 test method covers the characteristics of cylindrical concrete specimens. The shape and size of the specimen contribute to the calculation of its compressive strength. The method proceeds with the quality check, heat treatment, and the testing of the chemical composition of materials.  The results obtained from this method help in quality control, research, mixing, and placing operations; determination of compliance with specifications; control for evaluating the effectiveness of admixtures and performance evaluation of various cylindrical concretes.


    The method covers the application of a compressive axial load on the cylindrical concrete until failure occurs. The specimen must be kept moist and placed on the bearing block as per the standards specified. The load indicator is set to zero and the specimen is properly aligned. The load is applied continuously until a steady decrease is noted on the indicator. The compressive strength is calculated by applying the formula once the failure occurs.

    Specimen Size:

    Specimen size should be as per the requirements. In this case, the concrete should have a density of over 800 kg/m3 [50 lb/ft3].


    The compressive strength of the specimen is calculated by dividing the maximum load attained during the test by the cross-sectional area of the specimen. F stands for the compressive strength and P stands for the maximum load. 


    ASTM C39/C39M-21test method is specifically important for the quality assurance and durability check of cylindrical concrete specimens. The top service provider in this regard is the Infinita Lab which ensures efficient and reliable testing.


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