AASHTO T 299-93 (2004) PDF Download

AASHTO T 299-93 (2004) is a standard method of testing that focuses on the rapid identification of alkali-silica reaction products in concrete. Alkali-silica reaction is a chemical process that occurs when alkalis from cement react with certain siliceous materials in the aggregates used for making concrete, leading to the formation of a gel-like substance that can expand and cause damage to the concrete over time.

The purpose of this standard is to provide a visual detection method for identifying the presence of these alkali-silica reaction products in concrete. The test involves staining the concrete surface with a specific reagent that reacts with the alkali-silica reaction products, causing a distinct color change. By observing the stained areas, the presence and extent of alkali-silica reaction in the concrete can be determined.

This standard is important for assessing the potential durability and long-term performance of concrete structures, as alkali-silica reaction can lead to cracking, spalling, and overall deterioration of the concrete. By quickly identifying the presence of alkali-silica reaction products, appropriate mitigation measures can be implemented to prevent further damage and ensure the structural integrity of the concrete.