What is Alkali-Aggregate Reaction (AAR). Alkali-aggregate reaction (AAR) is a chemical reaction between the alkali in Portland cement and reactive minerals in aggregate and additives that takes place when moisture is present.herefore with aggregates falling in deleterious zone, Use of low alkali cement is recommended to prevent any chances of ASR occurrence. 1  Alkali-silica, a reaction between the alkali hydroxides in concrete and reactive forms of silica in aggregate (e.g., chert, quartzite, opal, strained quartz crystals); 2  Alkali-silicate, a reaction between the ....
For solid hardwood flooring, both unfinished and prefinished, acclimation is a must. The same thing for laminate flooring. Keep it in the house for at least 48 hours prior to installation. The negative effects of not acclimating your hardwood floors before installation can be either buckling or gaps between the boards.
acclimating engineered bamboo floating floor. I live in the foggy part of CA near Berkeley and we bought a click together floating engineered bamboo flooring. Regarding letting the flooring acclimate to its new surroundings, we've heard a wide range of times from as little as 24 hours to as many as 5 days. It's been about 24 hours and of course, it being the weekend, we were hoping to install it sooner rather than later.