ASTM C1074-19e1 PDF Download

ASTM C1074-19e1 is a standard practice that provides a procedure for estimating the strength of concrete using the maturity method. This method allows for the estimation of in-place concrete strength to determine if critical construction activities can begin. These activities include removing formwork, post-tensioning of tendons, termination of cold weather protection, and opening roadways to traffic.

The standard also states that the maturity method can be used to estimate the strength of laboratory specimens cured under non-standard temperature conditions. However, there are some limitations to using the maturity method. The concrete must be maintained in a condition that permits cement hydration, and the method does not take into account the effects of early-age concrete temperature on long-term strength. It is also recommended to supplement the method with other indications of the potential strength of the field concrete.

The accuracy of the estimated strength depends on using the appropriate parameters for the maturity functions, such as the datum temperature or the value of "Q." The standard provides approximate values for these parameters in an appendix, but suggests that for maximum accuracy, specific values for a concrete mixture can be determined using the procedures outlined in another appendix.