文献类型：期刊文献

中文题名：聚乙烯醇改性水泥砂浆的力学性能及微观结构

英文题名：Mechanical Properties and Microstructure of Polyvinyl Alcohol(PVA)Modified Cement Mortar

作者：范杰 李庚英

第一作者：范杰

机构：[1]贵州理工学院土木工程学院;[2]华南农业大学水利与土木工程学院

第一机构：贵州理工学院土木工程学院

年份：2018

卷号：0

期号：11

起止页码：18-22

中文期刊名：混凝土与水泥制品

外文期刊名：China Concrete and Cement Products

收录：北大核心:【北大核心2017】；

基金：国家自然科学基金项目(51708145;51378303;51378462);贵州省科学技术基金资助项目(黔科合基础[2018]1064);广东省科技计划资助项目(2015A010105029);广东省教育厅科技创新项目(2015KTSCX037)

语种：中文

中文关键词：聚乙烯醇;水泥砂浆;力学性能;微观结构

外文关键词：Polyvinyl alcohol;Cement mortar;Mechanical properties;Microstructure

摘要：探讨了聚乙烯醇(PVA)及其掺量对水泥砂浆物理力学性能影响。结果表明,随着PVA掺量变化,水泥砂浆的抗压、抗折、轴压强度均呈现明显的低升高降变化规律。PVA掺量为0.6%时,砂浆具有最优的抗压、轴压强度,较之未掺PVA的空白砂浆提升了12.15%和23.19%。1.0%的PVA掺量对水泥砂浆抗折强度提升最为显著,提升幅度达到24.83%。此外,采用扫描电镜对不同PVA掺量的水泥砂浆微观结构观测表明,适量PVA的掺入,能与水化产物结合形成均匀分布的三维网膜结构,桥接水泥板块,阻止裂缝开展,提升砂浆的力学性能。而当PVA掺量过高时,将析出大量的片状聚合物薄膜包裹于水泥表面,抑制水化,并对砂浆宏观性能造成不利影响。
The physical and mechanical properties of cement mortar with polyvinyl alcohol （PVA） added were experimentally studied. The results show that the compressive strength, flexural strength and prismatic compressive strength of cement mortar all increase first and then decrease with the change of PVA content. The compressive strength and prismatic compressive strength of cement mortar increase by 12.15% and 23.19% with the PVA content is 0.6%, and the flexural strength of cement mortar increases by 24.83% with 1.0% mass fraction of PVA incorporation. The microstructure of cement mortar with different PVA content is investigated by using scanning electron microscopy （SEM）, and the results show that the rational content of PVA can form evenly dispersed network-like thin films within cement matrix, these network-like films can bridge cracks in cement matrix and improve the mechanical properties of cement mortar. Over-incorporations of PVA may result in the formation of continuous polymer films, and its will cover cement particles and delay the hydration of cement, and adversely affect the performance of cement mortar.