Dispersion powders in cementitious systems

Depending on the saponification stability of the particular dispersion powder and its additive system the dispersion powders and their organic decomposition products can not only affect the mineral phase characteristics but may also have an elution behaviour that depends on the cementitious system and its pH.

Construction chemistry products containing a high proportion of dispersion powder, particularly those based on vinyl acetate homopolymers, have a lower stability in cementitious systems with high pH values, especially with high levels of alkalis. The water-soluble decomposition products can change the formation of mineral phases or can be eluted and detected in the aqueous extract.

 

Introduction

“Dispersion powder” implies a spray-dried composition treated with anti-caking agent that is produced from polymer dispersions and is present as a dry, free-flowing, powder. The polymer dispersions are...
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