AASHTO M 224-91 (2019) PDF Download

AASHTO M 224-91 (2019) is a standard specification that provides guidelines for the selection and use of protective sealers for Portland cement concrete. The purpose of this standard is to protect new concrete or extend the lifespan of existing concrete structures used in highway applications. It should be noted that this standard does not apply to the repair of severely deteriorated concrete.

The standard distinguishes between two types of sealers: coatings and penetrants. Coatings are applied to the surface of the concrete and remain on the surface, providing a protective layer. Penetrants, on the other hand, penetrate into the concrete to some measurable depth, offering protection from within.