环氧树脂乳液改性水泥砂浆性能与结构.pdfVIP

学兔兔 全国中文核心期刊 新 建巍 中国科技核心期刊 环螽榭fri lL液改lil ac泥础浆时生链与结构 章凯 (浙江省建筑科学设计研究院有限公司，浙江 杭州 310012) 摘要：研究了水性环氧树脂乳液改性水泥砂浆的力学性能、粘结性能、收缩性能和耐久性能，用SEM和MIP分析了砂浆的结 构。结果表明，掺加6％～10％水性环氧树脂乳液可有效提高水泥基修补砂浆的力学性能和与老砂浆的粘结强度，降低水泥砂浆的收 缩值；水泥砂浆的抗渗性、抗碳化性以及抗冻性能均随水性环氧树脂掺量的增加而显著提高；较之未经改性的普通砂浆，水性环氧树 脂乳液改性水泥砂浆的结构更为致密，连通孔的孔隙率和平均孔径小。 关键词：环氧树脂乳液；水泥砂浆；力学性能：粘结强度；收缩；耐久性；显微结构 中图分类号：TQ177．6 文献标识码：A 文章编号：1001—702X(2012)12—0040—03 Properties and structure of cement mortar modified with epoxy emulsion zHANG K (Zhejiang Academy of Building Research＆Design Co．Ltd．，Hangzhou 310012，Zh~iang，China) Abstract：The mechanical and adhesive properties，shrinkage and durability of cement mortar modified with water borne epoxy emulsion were experimentally studied，and the mierostruetures of the mortars were analyzed by SEM and MIP．The results showed that，adding 6％-10％(solid content)epoxy emulsion based on the mass of the cement in mortar will remarkably improve the me— chanical properties of the mortar，and the adhesive strength of the mortar with aged cement mortal．The drying shrinkage of the modified mortar decreased，and the chloride permeability，carbonation and frost resistance increased with the increase of the polymer amount added．Compared with ordinary cement mortar，the polymer modified cement mortar is more compacted in structure，lower in porosity and small in mean pore size． Key words：epoxy emulsion：cement mortar：mechanical property：adhesive strength：shrinkage：durability microstructure