纳米SiO_(2)对不同条件下聚合物改性砂浆强度的影响  

Effects of nano-SiO_(2) on mechanical properties of polymer modified mortar under different environments

作　　者：肖其远 朱英英[2] 杨奕 龙广成[1] 马昆林[1] 曾晓辉[1] XIAO Qiyuan;ZHU Yingying;YANG Yi;LONG Guangcheng;MA Kunlin;ZENG Xiaohui(School of Civil Engineering,Central South University,Changsha 410075,China;Zhe Jiang Baoye House Construction Group Co.,Ltd.,Hangzhou 312030,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]宝业集团浙江建设产业研究院有限公司,浙江杭州312030

出　　处：《混凝土》2022年第2期136-139,共4页Concrete

基　　金：国家自然科学基金资助项目(11790283)。

摘　　要：为掌握典型服役条件下不同聚合物改性砂浆抗压和抗折强度的变化及纳米材料对其影响,并为进一步工程应用提供技术支持,采用模拟试验方法,研究了掺与不掺纳米Si O2(NS)的EVA胶粉、SBR乳液和水性EP三类聚合物改性砂浆分别在基准养护、冻融循环及干湿交替条件的抗折强度和抗压强度变化规律,分析了NS对聚合物改性砂浆强度的影响效应。结果表明,NS能不同程度得改善上述三类聚合物改性砂浆体系的抗压强度和抗折强度,并对EVA、SBR和EP改性砂浆的抗冻性能、抗干湿交替作用性能有明显影响,其中掺2%~3%NS对EP改性砂浆的抗压、抗折强度改善效果最佳。In order to grasp the changes in compressive and flexural strength of different polymer modified mortars under typical service conditions and the influence of nanomaterials,and to provide technical support for further engineering applications,it used a simulation test method to study the influence of nano-SiO_(2)(NS)to EVA rubber powder,SBR emulsion and water-based EP three types of polymer modified mortar under the standard curing,freeze-thaw cycle and dry-wet alternate conditions,respectively.The flexural strength and compressive strength of modified mortar are tested.The results show that NS can improve the compressive strength and flexural strength of the above three types of polymer-modified mortar systems to varying degrees,and has obvious effects on the frost resistance and anti-dry and wet performance of EVA,SBR and EP modified mortars.Among them,mixing 2%~3%NS has the best effect on improving the compressive and flexural strength of EP modified mortar.

关 键 词：纳米SiO_(2)聚合物改性砂浆 力学性能 冻融循环 干湿交替 

分 类 号：TU528.01[建筑科学—建筑技术科学]