AASHTO T 325-04 (2020) PDF Download

AASHTO T 325-04 (2020) is a standard method of test that outlines the process for estimating the strength of concrete in transportation construction using maturity tests. The standard focuses on the use of a maturity index, which is a measure of the concrete's strength development over time based on its temperature history.

The standard requires that the strength-maturity relationship of the concrete job mix is determined in the laboratory prior to construction. This involves conducting tests to measure the concrete's strength at different maturity levels. These laboratory tests provide the basis for estimating the concrete's strength in the field.

In the field, the standard requires monitoring and recording the temperature history of the concrete after placement. This information is crucial for accurate assessment of the concrete's maturity and estimating its strength at any given point in time. The standard provides guidelines and procedures for collecting temperature data and calculating the maturity index.