Energy savings plus mechanical reinforcement and rheology control

Redispersible Polymer Latex Modified Portland Cement Mortar (A)

Adhesives Formulation

Applicable Type

Waterborne Adhesives

Applicable Base Polymer

Polyvinyl Acetate Emulsions & Derivatives (PVAc)

Applicable Industrial Sectors

Buildings & constructions

Applicable Base Polymer Properties

The primary redispersible powders that are used in polymer modified cement and concrete are based on polyethylene vinyl acetate (EVA) and polyvinyl acetate although others have been used. The requirements of these materials are the same as for liquid polymer latex, and the property improvements experienced by the modified mortars are likewise the same.

Typical Formulation Ingredients

Ingredient

Parts by weight

Portland cement

Sand

Cellulose Thickener

xxx

PVAc redispersible powder, RE526Z (Wacker)

xxx

PVA, Vinol 540S (Rohm and Haas)

Lime

(Source: Petrie, E.M., “Chemical Admixtures for Concrete and Mortar: Part II – Material Composition and Market Trends”, SpecialChem4Adhesives, 2007

Processing

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Resulting Properties

Redispersible polymer powders work in almost the same fashion as latex admixtures except that the polymer is added as a dry powder in the cement mix before addition of water. During mixing with water prior to application, the redispersible polymer powder is re-emulsified in the modified mortar and concrete and behaves in the same manner as the latex admixtures.

The powders are dry blended with cement and aggregates. When the dry cement blend is mixed with water and agitated, the polymer powder re-disperses (re-emulsifies) easily and provides essentially the same systems as when liquid polymer latexes are directly applied to the cement mixture.