AASHTO R 94-19 PDF Download

AASHTO R 94-19 is a standard practice that focuses on quality assurance, job site quality control, and reapplication of protective sealers for Portland cement concrete. The standard provides procedures and test methods for ensuring the quality and performance of sealers used to protect new concrete or extend the lifespan of existing concrete in highway structures.

The standard assumes that the sealers have been previously tested and prequalified through TP 96. It outlines testing methods for both routine product quality assurance and on-site quality control. These methods are used to assess the field performance of the sealers and determine when reapplication is necessary.

The standard distinguishes between two types of sealers: coatings and penetrants. Coatings remain on the surface of the concrete, while penetrants penetrate into the concrete to a measurable depth without significantly altering the concrete's appearance.