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Influence of Bayer Red Mud on the Operational and Mechanical Characteristics of composite cement mortar

Journal of Renewable Materials 2023年第11期11卷 3945-3956页

作者： Cheng Hu Weiheng Xiang Ping Chen Yi Yang Libo Zhou Jiufang Jiang Shunkai Li Yang Ming Qing Li Guangxi Key Laboratory of New Energy and Building Energy Saving Guilin University of TechnologyGuilin541004China College of Civil and Architectural Engineering Guilin University of TechnologyGuilin541004China Guangxi Engineering and Technology Center for Utilization of Industrial Waste Residue in BuildingMaterials Guilin University of TechnologyGuilin541004China Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources Guilin University of TechnologyGuilin541004China Guangxi Postdoctoral Innovation Practice Base Guangxi Yufeng Cement Group Company LimitedLiuzhou545008China

The aim of this study is to enhance the value and utilization of red mud generated in the Bayer process by preparing composite cement *** effects of two different types of Bayer red mud with varying physical and chemical characteristics on the fluidity,mechanical strength,mineral composition,and microstructure of the composite cement mortar were systematically *** results showed that the optimal addition of red mud A was 10 wt%,while it was 20 wt% for red mud *** mechanical properties of the composite cement mortar met the standards for P·O42.5 ***,the composite mortar with the addition of red mud B showed higher flexural and compressive strengths compared to the composite mortar with red mud *** improvement is attributed to the smaller particle size of red mud B,which filled the micro-pores and increased the compactness of the cement stone,as well as its higher content of Na_(2)O,K_(2)O,and other free alkalis,which resulted in more obvious alkali activation,accelerating the hydration of the active minerals in the slurry.

关键词： Bayer red mud composite cement mortar fluidity mechanical strength microstructure

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Research on the mechanical properties and electrical conductivity of cement mortar based on recycled nano-iron boride

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Waste Disposal and Sustainable Energy 2021年第2期3卷 155-164页

作者： Wei He Zhinan Jiao Yawei Wang Jihang Xu Qingxin Zhao College of Architectural Engineering and Mechanics Yanshan UniversityQinhuangdao 066004China Key Laboratory of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China

Traditional cement-based materials are being gradually replaced by nanomodified cement-based materials because the traditional materials cannot meet the production needs of modern ***-iron boride(nano-FeB)is a high-performance nanomaterial prepared from waste iron powder during *** one-dimensional structure is similar to that of carbon nanotubes,which makes it a potential candidate for nano-reinforcement *** this paper,the effects of different contents of recycled nano-FeB(0%,0.05%,0.075%,and 0.1 wt.%,based on cement weight)on the mechanical properties and electrical conductivity of cement mortar were *** results showed that the mechanical properties of the composite cement mortar were improved with the addition of *** the content of nano-FeB was 0.075%,the 28 d compressive strength and flexural strength of the composite cement mortar increased by 60.2%and 42.1%,*** addition,a 0.075%nano-FeB content favorably improved the conductivity of cement *** with that of the control group,the volume resistivity of the composite cement mortar decreased by one order of magnitude.

关键词： Construction waste iron powder Recycled nano-FeB composite cement mortar Compressive strength Flexural strength Electrical conductivity

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