(1. State Key Laboratory for Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;2. Jiangsu Building Energy Efficiency Engineering Research Center,Xuzhou,
Jiangsu 221116,China)
Abstract:The X-ray diffraction(XRD),the mercury intrusion porosimetry(MIP) and the environmental scanning electron microscope(SEM) were used to study the activity of fine aggregate of coal gangue under different calcination temperatures and the pore structure of hardened cement mortar of fine aggregate. The relationship between the pore structure and the strength of cement mortar was analyzed. The fine aggregates of coal gangue of different activity had the different levels of secondary hydration reaction with the hydration products of cement in the early period of hydration. The activity of fine aggregate of coal gangue affected the pore size distribution and porosity of hardened cement mortar. A highly active fine aggregate of coal gangue reduced the porosity of hardened cement mortar and optimized the pore size distribution. The harmful holes greater than 200 nm decreased significantly and the less harm or harmless holes of 100,20 nm increased. The hydration products of hardened cement mortar increased accordingly. The activity of calcined fine aggregate of coal gangue from low to high refined the porosity of the mortar,improved effectively the pore structure of cement mortar,reduced its porosity,and improved the strength of the mortar.
董作超1,夏军武1,2,段晓牧1,张志雄1. 基于徐州矿区煅烧煤矸石细集料活性的砂浆孔结构研究[J]. 岩石力学与工程学报, 2016, 35(04): 819-825.
DONG Zuochao1,XIA Junwu1,2,DUAN Xiaomu1,ZHANG Zhixiong1. Pore structure of fine aggregate mortar based on the activity of calcined coal gangue from Xuzhou mining area. , 2016, 35(04): 819-825.
段晓牧,夏军武,杨风州,等. 煤矸石集料性质对混凝土力学性能影响的试验研究[J]. 工业建筑,2014,44(3):114-118.(DUAN Xiaomu,XIA Junwu,YANG Fengzhou,et al. Experimental research on the influence of coal gangue aggregate behavior on the mechanical properties of concrete[J]. Industrial Construction,2014,44(3):114-118.(in Chinese))
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