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.
The flooring material needs to be acclimated in the area of installation. This means that if the laminate is to be installed in the family room, acclimation of the laminate flooring should take place in the family room. Storing the laminate flooring in the garage is not acclimation even if the garage is attached. Storage of the material at the store or warehouse of the dealer or installer is not acclimation of laminate flooring unless the floor is to be installed in the store or warehouse.