高温环境下叶蜡石对磷酸镁水泥作用机理分析  

Mechanism analysis of magnesium phosphatecement by pyrophyllite under high temperature

作　　者：冯学忠 刘巧玲[1,2,3] 张静[1] 徐庆东 窦霆 FENG Xuezhong;LIU Qiaoling;ZHANG Jing;XU Qingdong;DOU Ting(School of Civil Engineering,ShandongJianzhu University,Jinan 250101,China;Key Laboratory of Building Structural Retrofitting&Underground Space Engineering,Ministry of Education,Shandong Jianzhu University,Jinan 250101,China;Shandong Jianzhu University Engineering Appraisal and Reinforcement Research Institute Co.,Ltd.,Jinan 250101,China;Shandong Yongzheng Industrial Technology Research Institute Co.,Ltd.,Jinan 250101,China)

机构地区：[1]山东建筑大学土木工程学院,济南250101 [2]山东建筑大学建筑结构加固与地下空间工程教育部重点实验室,济南250101 [3]山东建筑大学工程鉴定加固研究院有限公司,济南250101 [4]山东永正产业技术研究院有限公司,济南250101

出　　处：《功能材料》2024年第12期12210-12216,共7页Journal of Functional Materials

基　　金：国家自然科学基金项目(52038006);国家自然科学基金面上项目(52078282);山东省重点研发计划(重大科技创新工程)项目(2021CXGC011204)。

摘　　要：磷酸镁水泥(MPC)作为无机胶粘剂用于建筑结构的加固修复,其耐高温性能成为研究热门。制备了一种叶蜡石复合磷酸镁水泥(P-MPC),通过力学性能、质量损失率、微观观测、物相分析等分析该材料的耐高温性能。结果表明,随着温度升高,MPC的抗压强度保留率随叶蜡石掺量的增加而逐渐上升,在800℃下,叶蜡石掺量为12%的MPC强度保留率为20%,超过空白对照组6%。通过物相组成分析发现水化产物鸟粪石的分解是导致MPC抗压强度降低的关键因素。热重曲线表明随叶蜡石掺量的增加,MPC的质量损失率逐渐降低。通过背散射电子能谱仪分析200℃和800℃下空白对照组和叶蜡石掺量为12%的试验组的微观形貌和元素比例,发现叶蜡石在高温下与MPC的结合仍能保持较好的完整性,说明此硅酸盐材料能够与MPC进行较好的融合继而改善MPC的耐高温性能。The high-temperature resistance of magnesium phosphate cement(MPC)as an inorganic adhesive for strengthening and repairing building structures has attracted significant attention.In this paper,a pyrophyllite compound magnesium phosphate cement(P-MPC)was prepared.The high-temperature resistance of this material was analyzed through mechanical properties,mass loss rate,microscopic observation,and phase analysis.Results indicate that with increasing pyrophyllite content,the compressive strength retention rate of MPC gradually in creased at elevated temperatures.At 800℃,the strength retention rate of MPC with 12%pyrophyllite content was 20%,exceeding 6%of the blank control group.Phase composition analysis revealed that the decomposition of hydration product struvite was a key factor leading to the decrease in compressive strength of MPC.Thermogravimetric analysis indicated that the mass loss rate of MPC decreased gradually with increasing pyrophyllite content.Backscattered electron spectrometer(BES)analysis of the microstructure and elemental composition of the blank control group and the experimental group with 12%pyrophyllite content at 200℃and 800℃showed that the pyrophyllite maintained good integrity with MPC at high temperatures,indicating that this silicate material can effectively combine with MPCthereby improv its high-temperature resistance.

关 键 词：叶蜡石 磷酸镁水泥 耐高温性 背散射能谱仪 

分 类 号：TU528[建筑科学—建筑技术科学]