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.
There are solid and engineered woods, and there are also site finished and pre-finished options too. For this discussion, we will consider the materials and costs for the installation of a prefinished hardwood floor in the average 250 square foot living room.This pricing will assume that the owner will want to keep costs low and will NOT cover such costs as:ardwoods are among the most durable and beautiful of flooring options, and they are one of the few that will actually boost the value of the property too. Home and property owners can find wood flooring in a huge number of styles and finishes.