Abstract
Polymer-modified mortars using powdered emulsions and aqueous polymer dispersions are prepared with various polymer-cement ratios, and observed by a scanning electron microscope for the morphological characterization of Ca(OH) 2. Some polymer-modified mortars are exposed under freezing-thawing conditions, and then observed by the scanning electron microscope for the same purpose. The morphology of Ca(OH) 2 in the polymer-modified mortars has been established on the basis of these observations. Moreover, the effect of freezing and thawing action on various types of morphology of Ca(OH) 2 crystals in the polymer-modified mortars is examined, and the relationship is pointed out between the improved crystal structure of Ca(OH) 2 in the polymer-modified mortars and their higher freeze-thaw durability.
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