Abstract
The impact of two different dialyzed styrene-acrylate polymer dispersions on the early hydration of OPC was studied. The polymer particles of both dispersions show a similar particle size distribution and high charge due to carboxylic groups on the surface of the particles. Both dispersions also show similar adsorption behavior. The hydration of the OPC was studied at a polymer concentration below the initial adsorption in order to evaluate possible reasons for the interaction of the polymer particles with cement hydration. It can be shown that the polymer particle with the lower glass transition temperature Tg shows a stronger impact on cement hydration, which cannot be explained by any influence on the pore solution composition or the initial dissolution of cement phases. Hence, the adsorption mechanism seems to be the most likely cause of the interaction of the polymers with hydrating cement.
Highlights
Composite binders combining inorganic binders such as Ordinary Portland cement (OPC) as well as organic binders such as polymer dispersions are widely used in numerous applications
It has been shown that water-soluble polymers that do not act as superplasticizers [8] as well as the aqueous phase of a dispersion containing e.g. water-soluble emulsifiers, protective colloids, or oligomers retard the cement hydration as well [9,10,11]
The present study concentrates on the surface effects of the adsorbed polymer particles, but not on a possible interaction of the free polymer particles with the ions dissolved in the pore solution
Summary
Composite binders combining inorganic binders such as Ordinary Portland cement (OPC) as well as organic binders such as polymer dispersions are widely used in numerous applications. The additional use of such organic binders improves significant properties such as the flexural strength, water impermeability, or adhesive strength [1,2,3]. These properties are very important for applications such as tile adhesives, selfleveling underlayments, sealing slurries, or repair mortars for concrete. It is well known that a range of compounds can retard cement hydration This impact is not limited to only dispersed polymer particles but is produced by water-soluble compounds and polymers. While the aqueous phase can lead to a pronounced prolongation of the induction period, the polymer particles can lead
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