ASTM C873/C873M − 10a Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

ASTM C873/C873M − 10a Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

Scope
1.1 This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork.

This test method is limited to use in slabs where the depth of concrete is from 125 to 300 mm [5 to 12 in.]. 1.2 Units—The values stated in either SI units or inch pound units are to be regarded separately as standard.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Combining values from the two systems may result in nonconformance with the standard.

ASTM C873/C873M − 10a Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds

Significance and Use
4.1 Cast-in-place cylinder strength relates to the strength of concrete in the structure due to the similarity of curing conditions because the cylinder is cured within the slab.

However, due to differences in moisture condition, degree of consolidation, specimen size, and length-diameter ratio, there is not a unique relationship between the strength of cast-inplace cylinders and cores of the same age.

When cores can be drilled undamaged and tested in the same moisture condition as the cast-in-place cylinders, the strength of the cylinders can be expected to be on average 10 % higher than the cores at ages up to 91 days for specimens of the same size and lengthdiameter ratio.