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含生活垃圾焚烧炉渣的碱矿渣水泥耐高温机理

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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 1 000℃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.
Research on high temperature resistance mechanism of alkali-activated slag paste containing municipal solid waste incineration bottom ash
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 aluminosili-cate hydrate is the highest and C/S is the lowest.The Al—O bond breaks at 600℃,while the Si—O bond breaks at 1 000℃.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.

alkali-activated slagmunicipal solid waste incineration bottom ashhigh-temperature resistancethermal shrinkagepolymerization degree of calcium aluminosilicate hydrate

张彬彬、马宇、梁咏宁、林毅武、季韬

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福州大学土木工程学院,福建 福州 350108

厦门正欣茂建设工程有限公司,福建 厦门 361101

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

国家自然科学基金福建省自然科学基金重点项目

522782482021J02021

2024

10.7631/issn.1000-2243.23050

福州大学学报(自然科学版)
福州大学

福州大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.35
ISSN：1000-2243
年,卷(期)：2024.52(3)
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