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.
Letting new floor acclimate to new room. I just bought my flooring tonight. Prefinished oak from HD. I have it in teh room it will go in (see my post about heat in that room on this thread too - Id appreciate it). I plan to install this saturday. Do I need to open these boxes up or as long as they are sitting in the room is that ok. Im hoping unopened is just as good - I have 18 boxes and would prefer not t have open boxes all over the floor.