材料科学
微观结构
磨细高炉矿渣
多孔性
粉煤灰
原材料
扫描电子显微镜
傅里叶变换红外光谱
熔渣(焊接)
抗压强度
环境友好型
水泥
复合材料
化学工程
化学
工程类
有机化学
生物
生态学
作者
Zhengqi Zhang,Zhongnan Tian,Kaiwen Zhang,Xiuming Tang,Yi Luo
标识
DOI:10.1016/j.conbuildmat.2020.121328
摘要
As a green and carbon-friendly material, alkali-activated grouting material (AAGM) has great application potential in reinforcement engineering. In this study, the alkali-activated slag/fly ash grouting material (AASFGM) was prepared with industrial-waste ground granulated blast-furnace slag (GGBS) and fly ash (FA) as raw materials. In order to meet the multi-performance requirements, a multi-index optimization design based on grey correlation and objective weight was adopted to prepare AASFGM pastes. And its physical performances including fresh and harden properties were tested and compared with those of cement grouting materials (CGM), more than that, the microstructure and strength development mechanism of AASFGM was further characterized by means of X-ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy-dispersive Spectrum (EDS) and Fourier transform infrared spectroscopy (FT-IR). It is found that the AASFGM paste possesses clean production, high mechanical strength, high fluidity, low bleeding rate and low porosity, providing appealing properties as grouting materials for reinforcement. The new multi-index optimization method, based on grey correlation and objective weights determined, is much more scientific and objective to obtain a balanced performance for AASFGM preparation. The optimized AASFGM paste has a uniform and compact microstructure, and it also has remarkable advantages in mechanical strength, bleeding rate and porosity compared with CGM. As a carbon-friendly grouting material, it may become a greener substitute of CGM for the cleaner reinforcement engineering.
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