摘要
采用硫酸钠溶液长期浸泡的方式,并通过测试砂浆抗压强度变化特征,研究再生细骨料掺量对砂浆抗硫酸盐侵蚀性能的影响,同时利用IR光谱、XRD衍射以及SEM等微观测试技术对其损伤破坏机理进行分析.研究结果表明:砂浆的抗硫酸盐侵蚀性能随着再生细骨料掺量的增大而下降,当掺量大于40%时,下降尤为明显.微观测试分析表明:再生细骨料砂浆发生硫酸盐侵蚀破坏是钙矾石和石膏等腐蚀产物的共同作用结果,然而当再生细骨料掺量较低时(<20%),钙矾石为破坏的主导因素,随着掺量的增加(≥60%),石膏成为破坏的主导因素;此外,上述腐蚀产物的数量随再生细骨料掺量的增多而增加.
Abstract The influence of recycled fine aggregate （RFA） content on the sulfate-resistance ability of mortar, which immersed in sulfate sodium solution long time, was researched by measured its com- pressive strength. The damage mechanism of RFA mortar was also studied by using IR （infrared）, XRD （X-ray powder diffraction） and SEM （scanning electron microscope）. The results indicate that the sulfate-resistance ability of mortar is weakened with the content of RFA increases, especially for higher 40 % river sand replacement ratio by RFA. The micro analysis shows that damage of RFA mor- tar immersed in sulfate sodium solution is induced by both ettringite and gypsum. But, when the river sand replacement ratio is less than 20%, ettringite is the dominant reason for the damage, and then gypsum becomes the dominant factor with the ratio increases to 60~//oo. In addition, the amount of ettringite and gypsum also increase with the river sand replacement ratio improves.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第5期85-89,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51108415)
宁波市创新团队资助项目(2011B810055)
关键词
硫酸盐
再生细骨料
砂浆
抗压强度
微观结构
钙矾石
石膏
sulfate
recycled fine aggregate
mortar
compressive strength
micro-structure
ettring-ite
gypsum
