摘要
为探究生活垃圾焚烧炉渣(MSWI-BA)对碱矿渣净浆耐高温性能的影响机理,将6%的矿渣等质量替换为MSWI-BA,制备碱矿渣水泥净浆(AASBp),研究不同温度对AASBp的质量损失率、干燥收缩率和强度的影响.以普通硅酸盐水泥净浆作为对照组,结合多种微观手段,揭示AASBp的耐高温机理,并与未掺MSWI-BA的碱矿渣水泥(AASp)进行对比.结果表明:随着温度的升高,AASBp中水化硅铝酸钙的钙硅比(C/S)先降低后升高;在400℃时,水化硅铝酸钙的聚合度最高,C/S最低;Al—O键在600℃断裂,而Si—O键在1000℃断裂;MSWI-BA可提高基体孔隙的连通性,高温处理后孔隙压力得到释放,因此AASBp比AASp具有更高的归一化抗压强度和耐高温性能.
In order to investigate the influence mechanism of municipal solid waste incineration bottom ash(MSWI-BA)on the high temperature resistance of alkali-activated slag paste,6%slag was replaced with the equal mass of MSWI-BA to prepare alkali-activated slag paste with MSWI-BA(AASBp).The effects of different temperatures on the mass loss rate,thermal shrinkage rate and strength of AASBp were studied.Ordinary Portland cement paste was used as a control group.The high-temperature resistance mechanism of AASBp was revealed by multiple microscopic approaches,and compared with alkali-activated slag paste without MSWI-BA(AASp).The results show that the calcium-to-silicon ratio(C/S)of calcium aluminosilicate hydrate of AASBp decreases first and then increases with an increase in temperature;at 400℃,the polymerization degree of calcium aluminosilicate hydrate is the highest and C/S is the lowest.The Al-O bond breaks at 600℃,while the Si-O bond breaks at 1000 C.Compared with AASp,AASBp has higher normalized compressive strength and better high-temperature resistance because MSWI-BA improves the connectivity of matrix pores and releases pore pressure after high temperature treatment.
作者
张彬彬
马宇
梁咏宁
林毅武
季韬
ZHANG Binbin;MA Yu;LIANG Yongning;LIN Yiwu;JI Tao(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China;Xiamen Zhengxinmao Construction Engineering Co.,Ltd.,Xiamen,Fujian 361101,China)
出处
《福州大学学报（自然科学版）》
CAS
北大核心
2024年第3期299-306,共8页
Journal of Fuzhou University(Natural Science Edition)
基金
国家自然科学基金资助项目(52278248)
福建省自然科学基金重点资助项目(2021J02021)。
关键词
碱激发矿渣
生活垃圾焚烧炉渣
耐高温
干燥收缩率
水化硅铝酸钙的聚合度
alkali-activated slag
municipal solid waste incineration bottom ash
high-temperature resistance
thermal shrinkage
polymerization degree of calcium aluminosilicate hydrate
