Mechanical Properties and Microstructure of Blended Cement Containing Modified Quartz Tailing
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2017年第5期
论文作者：陈登 邓敏 HAO Chengwei LAN Xianghui MO Liwu
文章页码：1140 - 1146
摘 要：The amount of inert quartz tailing used in concrete construction is limited due to the low strength development of cementitious materials that may be caused by the quartz tailing. We manage to increase the strength of blended cement by modifying quartz tailing through solid-phase reaction of quartz tailing with carbide slag at high temperature. The mineral composition and morphology of the modified quartz tailing were examined by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The mechanical properties and microstructure of blended cement mortars containing modified quartz tailing were investigated. Results showed that the strengths of blended cement mortars containing modified quartz tailing were close to those of the corresponding blended cement mortars containing quartz tailing at early age of 3 d, but increased significantly to be similar to that of plain Portland cement mortars at late ages of 90 d. This is attributed to the microstructure densification and the enhancement of interface between quartz tailing and cement paste due to the hydration of b-C2 S surface layer on modified quartz tailing.
陈登1,2，邓敏1，HAO Chengwei1,3，LAN Xianghui1，MO Liwu1
1. State Key Laboratory of Materials Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University2. College of Civil Engineering, Suzhou University of Science and Technology3. College of Architecture and Civil Engineering, West Anhui University
摘 要：The amount of inert quartz tailing used in concrete construction is limited due to the low strength development of cementitious materials that may be caused by the quartz tailing. We manage to increase the strength of blended cement by modifying quartz tailing through solid-phase reaction of quartz tailing with carbide slag at high temperature. The mineral composition and morphology of the modified quartz tailing were examined by X-ray diffraction（XRD） and scanning electron microscopy（SEM）. The mechanical properties and microstructure of blended cement mortars containing modified quartz tailing were investigated. Results showed that the strengths of blended cement mortars containing modified quartz tailing were close to those of the corresponding blended cement mortars containing quartz tailing at early age of 3 d, but increased significantly to be similar to that of plain Portland cement mortars at late ages of 90 d. This is attributed to the microstructure densification and the enhancement of interface between quartz tailing and cement paste due to the hydration of b-C2 S surface layer on modified quartz tailing.
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