Effect of fly ash on mechanics and microstructure of alkali-activated recycled cement

4th International Conference on Energy Equipment Science and Engineering

Wu, Shu-An^1 ; Wang, Xin^1 ; Gong, Yongfan^2

Department of Building Engineering, Yangzhou Polytechnic College, Yangzhou, JiangSu

225000, China^1

College of Civil Science and Engineering, Yangzhou University, Yangzhou, JiangSu

225000, China^2

关键词: Alkali activated;    Cement paste;    Cement type;    Fly ash cements;    Mechanical performance;    Ordinary Portland cement;    Recycled cements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/242/3/032061/pdf
DOI  :  10.1088/1755-1315/242/3/032061

来源: IOP

【 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.