不同水泥对长龄期砂浆孔隙率与微观形貌的影响  

The influences of different types of cement on the porosity and micromorphology of long-aged mortar

作　　者：董双快 陈亮亮 吴福飞[3] 张敏 DONG Shuangkuai;CHEN Liangliang;WU Fufei;ZHANG Min(Academic Affairs Office,Guizhou Normal University,Guiyang,Guizhou 550025,China;Chongqing Water Resources and Electric Engineering College,Chongqing 402160,China;School of Materials and Architectural Engineering,Guizhou Normal University,Guiyang,Guizhou 550025,China)

机构地区：[1]贵州师范大学教务处,贵州贵阳550025 [2]重庆水利电力职业技术学院,重庆402160 [3]贵州师范大学材料与建筑工程学院,贵州贵阳550025

出　　处：《贵州师范大学学报（自然科学版）》2020年第6期75-80,共6页Journal of Guizhou Normal University：Natural Sciences

基　　金：重庆市教委科学技术研究项目(KJQN201903801);重庆水利电力职业技术学院科研重点项目(KRC201803);贵州省教育厅青年科技人才成长项目(黔教合KY字[2018]125号);贵州师范大学2016年博士科研启动项目(0517073)。

摘　　要：为区别养护1000 d时贵州地区不同品种水泥的差异性,采用尧柏水泥、西南水泥、中诚水泥和豪龙水泥为研究对象,分析4种水泥对砂浆力学、孔隙率、吸水率和微观结构等的影响。结果表明:养护龄期越长,砂浆的孔隙率和吸水率越低,抗折强度和抗压强度越高。养护1000 d时,中诚水泥、尧柏水泥和豪龙水泥砂浆的孔隙率约为西南水泥的83.0%、86.7%和98.6%,抗折强度和抗压强度约比西南水泥提高15.8%/8.3%、9.5%/3.7%和3.2%/1.1%,4种水泥砂浆吸水率相差不到0.5%。经拟合发现,砂浆的孔隙率与抗折强度、抗压强度和吸水率呈线性关系,相关系数分别为0.8513、0.9059和0.7054。4种水泥水化后的产物主要为水化硅酸钙、少量的三硫型和单硫型水化硫铝酸钙等,养护1000 d时,砂浆的密实度越高和孔隙率越小。To distinguish the differences of different types of cement in Guizhou after curing 1000 days,Yaobai cement,Southwest cement,Zhongcheng cement,and Haolong cement were used as the research object to analyze the influences of the four types of cement on the mechanical strength,porosity,water absorption,and microstructure of mortar.The results show that the longer the curing age,the lower of the porosity and water absorption but the higher flexural strength and compressive strength of mortar.Compared to Southwest cement,the porosity of Yaobai cement,Zhongcheng cement,and Haolong cement reduced 83.0%,86.7%,and 98.6%,while flexural strength/compressive strength increased 15.8%/8.3%,9.5%/3.7%,and 3.2%/1.1%.T he difference in water absorption of the four cement mortars is less than 0.5%.After fitting,it is found that the porosity of the mortar has a linear relationship with the flexural strength,compressive strength,and water absorption;and the correlation coefficients are 0.8513,0.9059,and 0.7054,respectively.The hydration products of the four types of cement are mainly C-S-H,a small amount of trisulfide and monosulfide hydrated calcium sulfoaluminate.After curing for 1000 days,the density of the mortar increases,and the porosity decreases.

关 键 词：水泥 抗折强度 抗压强度 孔隙率 微观形貌 

分 类 号：TU528.01[建筑科学—建筑技术科学]