摘要
利用石墨尾矿作为硅质材料制备石墨尾矿蒸压加气混凝土,研究钙硅比(CaO和SiO_(2)摩尔比)、石膏掺量、铝粉掺量和水料比对石墨尾矿蒸压加气混凝土干密度和抗压强度的影响,并通过扫描电子显微镜(SEM)对不同钙硅比下石墨尾矿蒸压加气混凝土的微观形貌进行分析。结果表明,钙硅比为0.70时,有利于石墨尾矿蒸压加气混凝土中托贝莫来石生成。石墨尾矿蒸压加气混凝土中石膏的适宜掺量为2%。铝粉掺量对石墨尾矿蒸压加气混凝土孔隙率和孔隙特征影响较大,掺量增加使蒸压加气混凝土孔隙总面积、孔隙率及平均孔径增大,导致蒸压加气混凝土干密度和抗压强度下降,其合理掺量为0.10%。石墨尾矿蒸压加气混凝土干密度和抗压强度均随水料比的增大而降低,优选的水料比为0.60。利用石墨尾矿可制备强度等级为A5.0级、干密度等级为B06级的石墨尾矿蒸压加气混凝土。
In this paper,graphite tailings autoclaved aerated concrete is prepared with graphite tailings as siliceous material.The effects of calcium silicon ratio,gypsum content,aluminum powder content and water material ratio on the dry density and compressive strength of graphite tailings autoclaved aerated concrete are studied,and the micro morphology of graphite tailings autoclaved aerated concrete under different calcium silicon ratio is analyzed by scanning electron microscope(SEM).The experimental results show that when the calcium silicon ratio is 0.70,it is conducive to the formation of tobermorite in graphite tailings autoclaved aerated concrete.The appropriate content of gypsum in graphite tailings autoclaved aerated concrete is 2%.The content of aluminum powder has a great influence on the porosity and pore characteristics of graphite tailings autoclaved aerated concrete,with the increase of aluminum content,the total pore area,porosity and average pore diameter of autoclaved aerated concrete will increase,resulting in the decrease of dry density and compressive strength of autoclaved aerated concrete,the proper content of aluminum powder is 0.10%.The dry density and compressive strength of graphite tailings autoclaved aerated concrete decrease with the increase of water material ratio,the preferred water material ratio is 0.60.Graphite tailings autoclaved aerated concrete with strength grade A5.0 and dry density grade B06 can be prepared from graphite tailings.
作者
孙小巍
张雯琪
杨林
回志峰
吴昌鹏
戚红
Sun Xiaowei;Zhang Wenqi;Yang Lin;Hui Zhifeng;Wu Changpeng;Qi Hong(College of Materials Science and Engineering,Shenyang Jianzhu University,Shenyang,Liaoning 110168;Hubei Zhongdu Group Co.,Ltd.,Wuhan,Hubei 430000;Liaoning Provincial Institute of Product Quality Supervision and Inspection,Shenyang,Liaoning 110032;Hainan Branch of China Academy of Building Sciences Co.,Ltd.,Haikou,Hainan 571100)
出处
《非金属矿》
CSCD
北大核心
2022年第5期92-96,共5页
Non-Metallic Mines
基金
国家自然科学基金青年基金(51808354)
辽宁省教育厅“兴辽英才计划”项目(XLYC1902103)
辽宁省教育厅科学研究一般项目(LJKZ0593)。
关键词
石墨尾矿
蒸压加气混凝土
干密度
抗压强度
graphite tailings
autoclaved aerated concrete
dry density
compressive strength
