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首页> 外文期刊>材料 >Drying Shrinkage Reduction of polymer-Modified Mortars Using Redispersible Polymer Powder by Use of Shrinkage-Reducing Agents
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Drying Shrinkage Reduction of polymer-Modified Mortars Using Redispersible Polymer Powder by Use of Shrinkage-Reducing Agents

机译：通过使用收缩降低剂，使用可再分散聚合物粉末干燥聚合物改性砂浆的收缩减少

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In general, the drying shrinkage of polymer-modified mortars using redispersible polymer powders is much higher than that of unmodified mortar. The purpose of this study is to develop effective powdered shrinkage-reducing agents for reducing the drying shrinkage of polymer-modified mortars using a redispersible poly (ethylene-vinyl acetate) (EVA) powder, which is widely used for the manufacture of premixed -type polymer-modified mortar products at present. Polymer-modified mortars using the redispersible EVA powder with three powdered shrinkage-reducing agents were prepared with various polymer-cement ratios and shrinkage-reducing agent contents, and tested for drying shrinkage and strength. The conclusions obtained from the test results are summarized as follows (1) The drying shrinkage of the redispersible EVA powder-modified mortars with a powdered shrinkage-reducing agent, polyethylene glycol with a molecular weight of 3000 is remarkably reduced with increasing shrinkage-reducing agent content, and becomes approximately a half of that of the redispersible EVA powder -modified mortars with the same polymer-cement ratios and without the shrinkage-reducing agent at a shrinkage -reducing agent content of 6 percent, (2) The drying shrinkage of the redispersible EVA powder-modified mortars with the polyethylene glycol can be predicted as a function of the shrinkage-reducing agent content, polymer-cement ratio, water-cement ratio, air content and surface tension (of polymer-modified paste extracts), and (3) The addition of the polyethylene glycol to the redispersible EVA powder-modified mortars causes a reduction of 28 percent or less in the flexural strength and a reduction of 28 percent or less in the compressive strength.
机译：通常，使用可再分散的聚合物粉末的聚合物改性砂浆的干燥收缩远高于未修饰的砂浆。本研究的目的是开发有效的粉末收缩 - 还原剂，用于使用可再分散的聚（乙烯 - 乙酸乙烯酯）（EVA）粉末来减少聚合物改性砂浆的干燥收缩，这广泛用于预混型制造目前聚合物改性砂浆产品。使用各种聚合物水泥比和收缩降低剂含量制备使用具有三种粉末收缩还原剂的再分散EVA粉末的聚合物改性砂浆，并测试干燥收缩和强度。从测试结果获得的结论总结如下（1）可再分散EVA粉末改性砂浆的干燥收缩与粉末收缩降低剂，随着分子量为3000的聚乙二醇，随着收缩降低剂显着降低含量，并且变得大约是具有相同聚合物水泥比的可再分子EVA粉末粉末的一半，并且在收缩的还原剂的收缩剂含量为6％，（2）的干燥收缩具有聚乙二醇的可再攻击EVA粉末改性砂浆可以预测为收缩降低剂含量，聚合物 - 水泥比，水水解液，空气含量和表面张力（聚合物改性糊剂提取物）和（ 3）将聚乙二醇加入可再分散的EVA粉末改性砂浆导致弯曲强度降低28％或更低，减少抗压强度的28％或更少。

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