长期浸泡环境下复合磷酸镁水泥耐硫酸盐侵蚀性能研究  

Study on sulfate erosion resistance of composite magnesium phosphate cement under long-term immersion environment

作　　者：贾亮[1] 陈岑 JIA Liang;CHEN Cen(College of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《甘肃科学学报》2024年第5期146-152,共7页Journal of Gansu Sciences

摘　　要：为提高磷酸镁水泥(MPC)的耐水性和耐硫酸盐侵蚀性能以及降低施工成本,在MPC中掺入一定量的铁铝酸盐水泥(FAC)制备出新型MPC-FAC复合水泥。通过测试经历标准养护28 d,又分别在清水和5%Na_(2)SO_(4)溶液中浸泡不同龄期后的MPC-FAC砂浆试件的质量损失情况、抗压强度和抗折强度,与相同环境下的MPC砂浆试件进行比较,借助SEM-EDS分析长期浸泡的MPC和MPC-FAC砂浆的微观形貌和化学元素组成。研究结果表明,FAC质量分数为38%时MPC-FAC砂浆的质量损失率最小,抗压强度和抗折强度最高,耐水性和耐硫酸盐侵蚀性能最强;加入适量FAC使得MPC-FAC砂浆的密实性得到提高,显著提升了MPC-FAC砂浆的耐水性和耐硫酸盐侵蚀性。A new type of MPC-FAC composite cement was created by mixing a specific proportion of ferroaluminate cement(FAC)into magnesium phosphate cement(MPC)in an attempt to increase the water and sulfate erosion resistance of MPC and lower the cost of construction.The mass loss and compressive and flexural strength of MPC-FAC mortar specimens after standard curing for 28 days were tested and immersed in water and 5%Na_(2)SO_(4) solution at different ages,respectively,and compared with MPC mortar specimens under the same environment.The micromorphology and chemical composition of MPC and MPC-FAC after long-term immersion were analyzed by SEM-EDS.The results demonstrated that the MPC-FAC mortar with 38%FAC had the lowest mass loss rate,the highest compressive and flexural strengths,and the strongest resistance to water and sulfate erosion.The addition of an appropriate quantity of FAC enhanced MPC-FAC mortar's densification,which can significantly increase its resistance to water and sulfate erosion.

关 键 词：磷酸镁水泥 铁铝酸盐水泥 砂浆 长期浸泡试验 耐硫酸盐侵蚀性能 

分 类 号：TU528.31[建筑科学—建筑技术科学]