粉煤灰掺量对碳化水泥浆体微结构的影响  

Effect of fly ash dosage on microstructure of carbonized cement paste

作　　者：白佳佳 林楠[1] 王建民[1] 柳俊哲[1] BAI Jiajia;LIN Nan;WANG Jianmin;LIU Junzhe(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211

出　　处：《水资源与水工程学报》2022年第5期154-159,168,共7页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金项目(52178223)。

摘　　要：为了探究粉煤灰掺量对水泥浆抗碳化性能的影响,采用压汞法、可蒸发含水量法、XRD衍射图谱等,研究了碳化作用下粉煤灰掺量对水泥浆体内部微观结构的影响。结果表明:掺入粉煤灰可促进水泥浆试件的碳化,粉煤灰掺量为30%时水泥浆试件的碳化深度最大;随着粉煤灰掺量的增加,水泥浆总孔隙率增大,碳化后总孔隙率减小,小孔所占比例增大,水泥浆的孔结构改善效果越好,碳化后钙矾石消失,生成CaCO_(3);碳化有利于水泥浆试件裂缝的愈合,30%粉煤灰掺量试件养护后的平均裂缝宽度比养护前减小了72%。In order to explore the influence of fly ash content on the carbonation resistance of cement paste,the mercury intrusion method,evaporative water content method and XRD diffraction pattern were used to study the influence of fly ash content on the internal microstructure of cement paste under carbonation.The results show that the incorporation of fly ash promotes the carbonation of the cement paste specimens,and the carbonation depth of the specimens is the largest when the dosage of fly ash is 30%.With the increase of the fly ash dosage,the total porosity of the cement paste increases,the total porosity after carbonation decreases,the proportion of small pores increases,the pore structure of the cement paste is improved,the calcium alum after carbonation disappears,and calcium carbonate is generated.The carbonation is conducive to the healing of cracks in the cement paste specimens,and the average crack width with 30%fly ash dosage is reduced by 72%compared with that before the maintenance of fly ash.

关 键 词：水泥浆 碳化 粉煤灰掺量 微观结构 裂缝宽度 

分 类 号：TV41[水利工程—水工结构工程]