DRYING SHRINKAGE OF POLYMER CEMENT MORTAR USING REDISPERSIBLE POLYMER POWDERS

DOI Web Site 8 References
  • HIDAKA Koji
    OITA UNIVERSITY, Graduate Student, Doctor’s Course of Environmental Engineering（700, Dannoharu, Oita-shi, Oita 870-1192, Japan）
  • AKIYOSHI Yoshitada
    OITA UNIVERSITY, Department of Architectural Engineering, Faculty of Engineering（700, Dannoharu, Oita-shi, Oita 870-1192, Japan）
  • OTANI Toshihiro
    OITA UNIVERSITY, Department of Architectural Engineering, Faculty of Engineering（700, Dannoharu, Oita-shi, Oita 870-1192, Japan）
  • SATO Yoshiaki
    ZEROTECHNO Co. , Ltd, President（5-5-16, Oita 870-0027, Japan）

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Other Title
  • 再乳化形粉末樹脂を混和したポリマーセメントモルタルの乾燥収縮に関する研究

Abstract

<p>The influencing factors on drying shrinkage strain of cement mortar containing redispersible polymer powder （RPCM） are investigated by a drying shrinkage test with prism specimen which size is 40×40×160mm. The test conditions of temperature and humidity are 20±2℃ and 55±5％R.H., respectively. Two types of polymers polyacrylic ester polymer and vinyl acetate-vinyl versatate-acrylic acid polymer are used, and the content of these polymers are 0, 5 and 10％ by weight of cement. Results show that the higher the air content due to polymer, the higher the drying shrinkage strain. The ultimate strain is higher with the decrease of volume of fine aggregate or the increase of water-cement ratio. And the influence of polymer-cement ratio is different with type of polymer. Therefore, an estimating equation for ultimate strain of RPCM is constituted with corrected strain data by air content. That equation is consisted of a function of fine aggregate volume, water-cement ratio and polymer-cement ratio, and it was found that the proposed equation for drying shrinkage strain of RPCM can express the experimental data.</p>

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