Polymer-cement ratios very high

A very useful aspect of latex-modified mortars and concretes is their improved adhesion or bond strength to various substrates compared to conventional mortar and concrete. The development of adhesion is attributed to the high adhesion of polymers. The adhesion is usually affected by polymer-cement ratio and the properties of substrates used. The data on adhesion often show considerable scatter, and may vary depending on the testing methods, service conditions or porosity of substrates. 

As an initial composition, high performance mortar was used. This mortar possesses a very dense structure because of the addition of fly ash and silica fume, even before the addition of polymers. The water/cement ratio of 0.39 is kept constant in all mixtures. The dosage of polymer dispersions constitutes 10% and 20% and is denoted as mass percentage of the cement content. 

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