The effect of mechanical-thermal synergistic activation on the mechanical properties and microstructure of recycled powder geopolymer

被引:59
作者
Xu, Jun [1 ]
Kang, Aihong [1 ]
Wu, Zhengguang [1 ]
Gong, Yongfan [1 ]
Xiao, Peng [1 ]
机构
[1] Yangzhou Univ, Coll Architectural Sci & Engn, Yangzhou 225127, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Synergistic activation; Recycled powder; Geopolymer; Mechanical properties; Microsturcture; AIR-COOLED SLAG; CLAY BRICKS; FLY-ASH; GLASS POWDER; SILICA FUME; CONCRETE; WASTE; CEMENT; CONSTRUCTION; PERFORMANCE;
D O I
10.1016/j.jclepro.2021.129477
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
To improve the activity and utilization of recycled powder (RP) obtained from scrap concrete, the effect of mechanical-thermal synergistic activation on the activity of recycled powder and the properties of recycled powder geopolymer (RPG) was investigated in this work. The compressive strength, scanning electron microscope(SEM), X-ray diffraction (XRD), infrared spectroscopy (IR) and mercury intrusion pore measurement (MIP) were used to evaluate the mechanical property and microstructure of RPG, respectively. The optimal compressive strength was obtained when the activation temperature was 750 degrees C and the grinding time was 10 min. The 3-day, 7-day and 28-day compressive strength increased 77.91%, 109.88% and 108.18%, respectively, compared to the untreated recycled powder geopolymer samples. The microstructure analysis showed that the activation effect of single activation mode on the activity of recycled powder was not prominent; however, better properties and denser structure were obtained when the thermal-mechanical activation synergistically work. It is feasible to improve the utilization rate of recycled powder by synergistic activation and the effect is remarkable.
引用
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页数:12
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