干湿循环条件下磷建筑石膏复合材料耐水性能研究  

The water resistance of phosphogypsum composite material under dry-wet cycle

作　　者：王锦[1] 王思骅 何兆聆 孙延华 WANG Jin;WANG Sihua;HE Zhaoling;SUN Yanhua(Department of Industrial Mining and Architecture,Bijie Vocational and Technical College,Bijie 551700,China;School of Civil and Architectural Engineering,Guizhou University of Engineering Science,Bijie 551700,China)

机构地区：[1]毕节职业技术学院工矿建筑系,贵州毕节551700 [2]贵州工程应用技术学院土木建筑工程学院,贵州毕节551700

出　　处：《新型建筑材料》2023年第12期30-33,共4页New Building Materials

基　　金：贵州省教育厅科技拔尖人才项目(黔教合KY字[2017]098);毕节市科学技术联合基金项目(毕科联合[2023]4号)。

摘　　要：重点关注在干湿循环条件下,磷建筑石膏的性能劣化情况;通过掺入硬石膏对复合石膏的耐干湿循环性能进行改善,分析了复合石膏耐干湿循环性能改善的机理。结果表明:随着干湿循环的进行,磷建筑石膏的绝干抗折、抗压强度不断降低,溶蚀率不断增大;复合石膏的绝干抗折、抗压强度表现为先提高后降低的趋势,在10次干湿循环后,复合石膏的绝干抗折、抗压强度开始高于磷建筑石膏,复合石膏的溶蚀率变化趋势与磷建筑石膏一致,且一直大于磷建筑石膏;复合石膏中存在未水化的硬石膏,在干湿循环过程中不断水化,使得复合石膏前期强度有所提高,同时抑制二水石膏的溶解,减缓复合石膏的强度损失。This paper focuses on the performance degradation of phosphogypsum under dry-wet cycle conditions.The dry-wet cycle properties of phosphogypsum anhydrous gypsum composite is improved by adding anhydrous gypsum,and the mechanism of anhydrous gypsum improving the dry-wet cycle properties of composite gypsum is further analyzed.The results show that with the increase of dry-wet cycle times,the absolute dry flexural and compressive strength of phosphogypsum continues to decline,and the corrosion rate increases gradually.The absolute dry flexural and compressive strength of composite gypsum increases first and then decreases.After 10 dry-wet cycles,the absolute dry flexural and compressive strength of composite gypsum begins to be greater than that of phosphogypsum,and the change trend of corrosion rate of composite gypsum is same as that of the phosphogypsum,and has always been greater than that of phosphogypsum.There is anhydrous gypsum in the composite gypsum,which is continuously hydrated during the dry-wet cycle,which increases the early strength of the composite gypsum,inhibits the dissolution of calcium sulfate dihydrate and slows down the strength loss of the composite material.

关 键 词：磷建筑石膏 硬石膏 干湿循环 耐水性能 

分 类 号：TU526[建筑科学—建筑技术科学]