A predictable reaction profile is key when considering how to best approach a Mountain Grout Acrylate application. Acrylate’s reactivity is impacted by a variety of factors, such as percent additives (e.g. 0.5%, 1%, 2%, 5%), ambient temperature, pH of groundwater on site, and soil type. Acrylate resins cure by free radical polymerization. This reaction opens the double bonded carbons for crosslinking. Free radicals can be produced by ultra violet light or an oxidizing agent, such as sodium persulfate. It just so happens that sodium persulfate is the additive to the Mountain Grout Acrylate.
The rate of reaction is controlled by several factors. Like most chemical reactions, the temperature is very important. Higher temperatures make the molecules more active and results in faster reactions. With Acrylates, the rate at which free radicals are generated will influence the rate of the polymerization. Some materials act as retarders and will essentially absorb the free radicals and inhibit the reaction. The generation of free radicals by the sodium persulfate is initiated by the higher pH caused by the TEA in the water side of the mixture. Therefore, it is understandable that if injecting into alkaline or acidic water, the reaction rate will be altered.
When there is concern about the existence of pH variables or the presence of potential retarding agents, it is best to proceed with reaction tests on site to have confidence in the process. More information about the site-specific conditions, yields a higher likelihood of a predictable reaction profile.
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