アクリル系ポリマーエマルジョン混入セメントモルタルの乾燥収縮に関する研究
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概要
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The drying shrinkage of cement mortars modified by polymer emulsions except polyvinyl acetate emulsion is generally known to be lower than that of unmodified cement mortars. The drying shrinkage depends on the polymer composition and content. The polymer emulsions used as cement modifiers in this study were polymerized in aqueous solution with ammonium persulfate as an initiator, and polyethyleneglycol and surfactant as stabilizers. The tests for the drying shrinkage were carried out by using specimens of 4×4×16 cm size and the measurements were made by a dial-gauge. The first part of experiments were performed to determine the drying shrinkage of cement mortars modified with polyethylacrylate. The results used to discuss the relationships between the drying shrinkage and the polymer-cement ratio, water-cement ratio at a constant polymer-cement ratio and the evaporative water loss. The second part of experiments were performed to study the drying shrinkage of mortars with acrylic polymers or copolymers having various glass transition temperatures. The main results are as follows : (1) The cement mortars modified with polyethylacrylate were observed to expand during the initial period of curing, the magnitude of expansion depending upon the polymer-cement ratio, cement-sand ratio and humidity of curing. (2) The close relationship between the drying shrinkage of cement mortars with acrylic polymer or copolymer and the glass transition temperature of polymer was noticeable. (3) The very low drying shrinkage of cement mortar could be obtained by the modification with acrylic polymer or copolymer having very low glass transition temperature.
- 社団法人日本材料学会の論文
- 1975-04-15