AASHTO R 60-12 (2020) PDF Download

The AASHTO R 60-12 (2020) standard provides guidelines for sampling freshly mixed concrete. The standard outlines procedures for obtaining representative samples of concrete that is delivered to a construction site, which will be tested to determine if it complies with the specified quality requirements. The method covers sampling from different types of equipment, including stationary, paving, and truck mixers, as well as agitating and non-agitating equipment used for transporting central mixed concrete.

It is important to note that this standard requires combined samples, unless specifically exempted by the testing procedures for certain tests like determining consistency uniformity and mixer efficiency. The specific process for selecting the test batches is not described in detail but it is recommended to use random sampling for overall compliance with specifications.

Additionally, this standard covers the procedures for preparing a concrete sample for further testing when it is necessary to remove aggregate particles larger than a designated size. The recommended method for removing larger aggregate particles is through wet-sieving.