养护条件对EVA乳液改性水泥浆体水化行为和孔结构的影响  

Effects of Curing Conditions on Hydration Behavior and Pore Structure of EVA Emulsion Modified Cement Paste

作　　者：丁少沛 王健涛 刘云鹏[1] 何永佳[1] DING Shaopei;WANG Jiantao;LIU Yunpeng;HE Yongjia(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐通报》2021年第7期2145-2151,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家重点研发计划(2017YFB0310000);国家自然科学基金(51972250)。

摘　　要：本文制备了不同乙烯-醋酸乙烯酯(EVA)乳液含量的聚合物改性硅酸盐水泥浆体,对比了其在相同水灰比,不同养护制度(标准养护、蒸汽养护)条件的水化性能与孔结构。通过X射线衍射分析、水化热分析、压汞分析、氮吸附测试,以及立方体抗压强度测试评价了EVA乳液在不同养护状态下对水泥水化产物、水化特性、孔结构以及抗压强度的影响。结果表明,与标准养护相比,蒸汽养护下EVA乳液没有改变水泥水化产物,在EVA乳液较高掺量下,降低了其延缓水泥水化的程度,降低了试样的孔隙率,并且增加了试样中小孔的含量,而蒸汽养护削弱了EVA乳液对水泥净浆强度的负面影响。In this paper,the polymer modified Portland cement paste with different EVA emulsion content was prepared.The hydration properties and pore structure of the modified Portland cement paste under the same water cement ratio and different curing systems(standard curing and steam curing)were compared.The effects of EVA emulsion on the hydration products,hydration characteristics,pore structure and compressive strength of the cement under different curing conditions were evaluated by X ray diffraction analysis,hydration heat analysis,mercury intrusion analysis,nitrogen adsorption test and cube compressive strength test.The results show that compared with the standard curing,EVA emulsion does not change the hydration products of cement under the steam curing.When the amount of EVA emulsion is higher,it decreases the degree of cement hydration,reduces the porosity of samples,increases the pore size of samples,and the steam curing decreases the negative effect of EVA emulsion on the strength of the cement paste.

关 键 词：EVA乳液 蒸汽养护 压汞分析 水化行为 孔结构 

分 类 号：TQ172[化学工程—水泥工业]