聚合物改性粘结砂浆的性能研究  

Study on Performance of Polymer-modified Bonding Mortar

作　　者：丁向群[1] 张冷庆[1] 冀言亮[1] 王钰[1] 邢进[1] 

机构地区：[1]沈阳建筑大学材料科学与工程学院,沈阳110168

出　　处：《硅酸盐通报》2014年第5期1040-1044,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(51078241);中国建材联合会项目(2103-M3-8)

摘　　要：本文介绍了一种新型聚合物改性粘结砂浆(PMBM),并研究了聚合物对粘结砂浆性能的影响,测试了砂浆的抗冻性、粘结抗拉强度、收缩率和吸水率等性能;利用扫描电镜等观察了聚合物改性粘结砂浆硬化体的微观结构,分析了苯丙乳液对水泥砂浆的改性机理。研究表明,聚合物能降低砂浆的压折比、吸水率和收缩率,改善砂浆的抗冻性及耐久性。聚合物掺量为20%时,PMBMs压折比小于3.0,符合粘结砂浆对压折比的要求;PMBMs收缩率为0.0351%,远小于普通粘结砂浆;经6次冻融循环后,试样的质量损失和强度损失分别为0.22%和-18.7%;粘结抗拉强度(28 d)为4.4 MPa远高于普通粘结砂浆(0.82 MPa);扫描电镜显示PMBMs内部孔隙具有光滑的孔壁结构。A new kind of binding mortar was developed by adding polymer, and the influences of polymer on bonding mortars were analyzed. The properties of frost-resistance, bonding strength, shrinkage and water absorption were tested. Scanning electron microscope （ SEM ） and energy dispersive spectrometer （EDS） were employed to analyze the microstructure of the polymer modified bonding mortars （ PMBM ）, and the modification mechanism of styrene-acrylic emulsion on mortars were investigated. When 20% polymer added, the pressure off ratio is below 3.0, meeting with the criterion of bonding mortar, the shrinkage is 0. 351%, lower than that of normal mortar, the mass loss and strength loss ratios are 0.22% and 1.89%, the bonding strength far higher than that of normal mortar. The analyzing results of SEM showed that PMBMs have a smooth pore structure. It indicated that polymer can lower the water absorption ratio and shrinkage of PMBMs, and ameliorated the freezing resistance and durability.

关 键 词：聚合物改性砂浆 粘结强度 耐久性 吸水率 强度损失 

分 类 号：TU57[建筑科学—建筑技术科学]