| 摘要: |
| 采用流变学测试方法，研究了聚合物乳液对水泥砂浆屈服应力、蠕变恢复、动力黏度及触变性的影响.结果表明：水泥砂浆屈服应力随着聚合物乳液掺量的增加而急剧增大，最大增至普通水泥砂浆的962倍；水泥砂浆蠕变在外力作用下逐渐增大，撤销外力后出现瞬时恢复，之后保持恒定，蠕变恢复能力随着聚合物乳液掺量的增加而增大，最大增幅在100倍左右；水泥砂浆动力黏度随剪切时间的增加而不断减小，聚合物乳液掺量的增大加剧了动力黏度减小的趋势；在触变性试验中随着聚合物乳液掺量的增加，水泥砂浆结构破坏后的恢复能力不断增强，最大增幅为7257%. |
| 关键词: 道路工程 聚合物乳液 水泥砂浆 流变性能 屈服应力 蠕变恢复 动力黏度 触变性 |
| DOI：103969/j.issn.1007 9629201706022 |
| 分类号: |
| 基金项目:云南省应用基础研究面上项目（2016FB099）；云南省交通规划设计研究院科技项目(ZL 2015 04)；国家自然科学基金资助项目（51508137）；中国博士后科学基金面上资助项目（2014M560266）；国际合作项目（2014DFR81000） |
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| Effect of Polymer Latex on Rheological Properties of Cement Mortar |
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ZHENG Shaopeng1, NIU Kaimin1, TIAN Bo1, CHEN Liangliang2, CHENG Zhihao2, XU Yunxi2
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1.College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China;2.National EngineeringLaboratory for Surface Transportation Weather Impacts Prevention, Broadvision Engineering Consultants, Kunming 650041, China
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| Abstract: |
| The yield stress, creep and recovery, dynamic viscosity and thixotropic properties of cement mortar by adding polymer latex were investigated by using rheological test method. The yield stress of cement mortar increases sharply with the increasing polymer latex content, the maximum growth is 962 times that of ordinary cement mortar. Creep variables increases gradually under the action of external force. After instantaneous recovery the creep variables kept constant, the recovery ability increases with the increase of polymer latex, to about 100 times. The dynamic viscosity decreases with the increase of shear time. The increase of polymer latex content exacerbates the trend of dynamic viscosity reduction. With the increase of polymer latex content, the recovery ability of the structure increases in thixotropy test, up to maximum increase of 7257%. |
| Key words: road engineering polymer latex cement mortar rheological property yield stress creep and recovery dynamic viscosity thixotropy |
