摘要
保温隔热材料集成优秀防火功能将有利于建筑消防安全。以高温性能良好的磷酸镁水泥为基体,预饱和膨润土为成孔剂,制备了磷酸镁水泥基多孔材料,采用压汞、扫描电镜等对其微结构进行了测试,同时还研究了其模拟火灾前后硬化性能。研究表明:预饱和膨润土促使磷酸镁水泥中形成了微纳米孔,实现了磷酸镁水泥基多孔材料制备;当成孔剂体积掺量为80%时,制备出干密度642kg/m~3、孔隙率43.0%的磷酸镁水泥基多孔材料,28d抗压强度为2.1 MPa、导热系数为0.09W/(m·K);模拟火灾情况后,多孔材料力学强度与保温隔热性能保持较好。
Integration of excellent fireproof function of thermal insulation material will be beneficial to building fire safety.Magnesium phosphate cement with good high temperature performance used as matrix,pre-saturated bentonite used as pore-forming agent were used to prepare magnesium phosphate cement-based porous materials.Mercury intrusion porosimetry,scanning electron microscopy and other methods were used to characterize their microstructures,and the hardened performance before and after simulated fire were also investigated.The results indicated that pre-saturated bentonite promoted the formation of micro-size or nano-size pores in magnesium phosphate cement and realized the preparation of magnesium phosphate cement-based porous material.When the volume admixture of porogenic agent was 80%,the porous material based on magnesium phosphate cement with dry density of 642kg/m~3 and 43.0% porosity was prepared with 28-day compressive strength of 2.1 MPa and thermal conductivity of 0.09 W/(m·K).After treated in simulated fire,mechanical strength and thermal insulation performance of these porous materials kept well.
作者
丁涛
刘铁
蒋俊
吕淑珍
李军
金超
赖振宇
DING Tao;LIU Tie;JIANG Jun;LV Shu-zhen;LI Jun;JIN Chao;LAI Zhen-yu(State Key Laboratory of Environment-friendly Energy Materials,Southwest University of Science and Technology,Mianyang 621010,China;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China;Ningbo Construction Engineering Group Co Ltd,Ningbo 315040,China)
出处
《武汉理工大学学报》
CAS
2022年第8期7-13,共7页
Journal of Wuhan University of Technology
基金
四川省科技计划项目(2019ZDZX0024)
西南科技大学博士基金(20zx7102)。
关键词
磷酸镁水泥
膨润土
孔结构
保温隔热
防火性
magnesium phosphate cement
bentonite
pore structure
thermal insulation
fire resistance
