AASHTO PP 65-11 (2016) PDF Download

AASHTO PP 65-11 (2016) is a standard practice that provides guidelines for determining the reactivity of concrete aggregates and selecting appropriate measures to prevent deleterious expansion in new concrete construction. The standard covers both alkali-silica reactive and alkali-carbonate reactive aggregates.

To prevent expansion caused by alkali-silica reactive aggregates, several measures can be taken. These include avoiding the use of reactive aggregates altogether, limiting the alkali content of the concrete, using blended cement which contains supplementary cementitious materials, or using lithium nitrate as an admixture. It is also possible to implement a combination of these measures to further mitigate the risk of deleterious expansion.

On the other hand, for alkali-carbonate reactive aggregates, the only preventive measure recommended is to avoid the use of such aggregates in concrete construction.