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.
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