Causes of Blistering in Plastic Coatings on Screeds and Concrete

Abstract

In the course of repairs or upgrading measures, it is often necessary to provide floors with synthetic resin coatings. After the work has been carried out, bubbles may form. The article lists the various mechanisms that cause blistering (osmotic pressure, impurities in the aggregate of the screed or concrete, chemical reactions, e.g. alkali silica reaction). By aid of a case study, the procedure for determining the causes of blistering is given in more detail. The investigations have shown that the formation of bubbles was due to alkali-silica reactions of opal sandstone particles in the screed.