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标题：Effect of fly ash on mechanics and microstructure of alkali-activated recycled cement
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作者：Shu-an Wu ; Xin Wang ; Yongfan Gong 等
期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：242
期号：3
页码：1-6
DOI：10.1088/1755-1315/242/3/032061
出版社：IOP Publishing
摘要：The effect of fly ash on mechanical performance of alkali-activated recycled cement was studied. The result shows that the cement types have a significant impact on the strength of alkali-activated recycled cement pastes. The alkali-activated recycled cement pastes prepared from fly ash cement (PF) have higher strength. When replaced by 15%~30% of fly ash, the strengths of alkali-activated recycled cement pastes prepared from ordinary Portland cement and slag cement can be significantly improved. When the replacement of fly ash added to 15%, the 90 days flexural and compressive strengths of the alkali-activated recycled PS cement pastes were 6.2 MPa and 30.9 MPa. Image (SEM) of the alkali-activated recycled PS cement pastes replaced by 15% fly ash showed that the microstructure is more uniform and compact than that unmodified.