Can be alleviated though using low-alkali cements or nonreactive aggregates. The reactive igneous rocks include those that contain volcanic glass with a composition ranging from rhyolite through andesite.
Basaltic rocks contain too little silica to be reactive.
Zeolite minerals, which are relatively soluble in water, are undesirable in aggregates that will be exposed to the weathering process. Excavation must extend through this material into sound rock. Igneous rocks are commonly used for this purpose because of their resistance to weathering. Rock that undergoes staining, fracturing and spalling of the surface must be avoided when selecting proper building stone. Strong, fresh, and unaltered igneous rocks yield the most suitable materials.