TeachMeFinance.com - explain Alkali-silicate-silica reaction (ASSR)
Alkali-silicate-silica reaction (ASSR) The term 'Alkali-silicate-silica reaction (ASSR)' as it applies to the area of reclamation can be defined as ' Reaction of alkalis with strained quartz is thought to be one reactive component of aggregates causing this reaction. A wide variety of quartz-bearing rocks have been found to be reactive including graywackes, argillites, quartzwackes, quartzarenites, quartzites, hornfels, quartz biotite, gneiss, granite, phyllite, arkose and sandstone. This type of reaction is characterized by a delayed onset of expansion and cracking may not become evident for up to 20 years after construction. See alkali-aggregate reaction'.
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