期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 220, 期 -, 页码 565-576出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2019.05.193
关键词
Cement; Alkali-activated binders; Lightweight mortars; High temperature behaviour; Fire resistance; Waste valorisation; Mechanical strength; Thermal conductivity; Geopolymer
The behavior of lightweight cement-based and alkali-activated mortars after exposure to temperatures of 500, 750, and 1000 degrees C was compared. In cement-based mortars, cement was partially replaced (40 vol%) by several refractory fillers (coal fly-ash, biomass fly-ash, cocciopesto, metakaolin). In alkali-activated mortars, metakaolin was partially substituted (0, 25, 50 wt%) by coal fly-ash. The substitution of cement by 40% metakaolin and the substitution of metakaolin by 50% fly ash enhances the resistance to high temperatures of cement-based and alkali-activated mortars, respectively. After exposure to 1000 degrees C, the high residual compressive strength of cement-based mortars with metakaolin is due to the formation of new crystalline species, whereas in alkali-activated mortars is due to their high densification. (C) 2019 Elsevier Ltd. All rights reserved.
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