STATE-OF-THE-ART REPORT ON POLYMER-MODIFIED CONCRETE

Dispersions of polymers in water and redispersible polymer powders hav e been in use for many years as admixtures to portland cement mortar a nd concrete. These dispersions are commonly called latexes. The proper ty improvements from this family of admixtures includes increased bond strength, reduced permeability, increased resistance to freezing and thawing, and increased flexural strength. The specific property improv ement to the modified mortar and concrete will vary with the type of l atex used. The proportioning of ingredients and mixing procedures are similar to unmodified mortars and concretes. Curing is different in th at only 1 to 2 days of moist cure are required. This is followed by ai r drying. Applications of these materials include tile adhesive and gr out, floor leveling, concrete patching, and bridge deck overlays.