聚合物改性特种水泥灌浆料的性能

Properties of Polymer Modified Grouting Materials with Special Cement

研究了聚合物改性特种水泥浆的非压力灌浆性能及其它性能.结果表明,在水泥浆体粘度相同的情况下,聚合物改性水泥浆体可灌性得到明显的改善;同时,聚合物改性水泥浆体与老混凝土的粘结性能大大改善.丙烯酸酯乳液和丁苯乳液改性水泥浆的拉伸粘结强度比对比水泥浆体提高约100%～300%.丙苯乳液改性硫铝酸盐水泥的1,4d剪切粘结强度最大可提高100%和140%,聚合物的最佳掺量(聚合物占水泥的质量分数)应在25%左右.聚合物改性水泥浆体的干燥收缩与聚合物的品种、填料掺量和水灰比有关.

The grouting, adhesive and shrinkage properties of polymer modified grouting materials with special cement were studied. The test results show that the grouting and adhesive properties of cement paste are obviously improved with polymer. The tensile bond strength between acrylate latex or styrene/butadiene latex modified cement paste to old concrete is 100%～300% higher than that of the control paste. The compressive shear bond strength of acrylate/styrene latex modified paste prepared with sulfoaluminate cement at 1, 4 d age and the polymer/cement ratio of 25% can be increased by 100% and 140% than the control paste. The shrinkage of the polymer-modified cement paste varies with polymer types, filler addition and water cement ratio.