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《材料导报》期刊社  2018, Vol. 32 Issue (14): 2390-2395
  无机非金属及其复合材料 |
马宏强1, 易成1, 朱红光1, 董作超2, 陈宏宇1, 王佳欣1, 李德毅1
1 中国矿业大学北京力学与建筑工程学院,北京 100083;
2 江苏科技大学土木工程与建筑学院,镇江 212005
Compressive Strength and Durability of Coal Gangue Aggregate Concrete
MA Hongqiang1, YI Cheng1, ZHU Hongguang1, DONG Zuochao2, CHEN Hongyu1, WANG Jiaxin1, LI Deyi1
1 School of Mechanics and Civil Engineering, China University of Mining and Technology Beijing, Beijing 100083;
2 School of Architecture and Civil Engineering, Jiangsu University of Science and Technology, Zhenjiang 212005
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摘要 以煤矸石-普通碎石混合作为粗集料制备了一系列混凝土试样,其中煅烧和未煅烧煤矸石等量替代普通碎石的掺量为0%、30%、50%、70%和100%,探究了煤矸石粗集料掺量和700 ℃煅烧对混凝土抗压强度、快速氯离子渗透、抗碳化性能和抗硫酸盐侵蚀性能的影响,并借助X射线衍射仪(XRD)观测矿物成分变化,利用扫描电子显微镜(SEM)观测微观结构。实验结果表明煤矸石作混凝土集料是可行的,最大掺量受混凝土设计强度和所处环境的限制。煤矸石与胶凝材料粘结处空腔的存在不利于混凝土抗压强度和耐久性能,但对固化氯离子性能有利。相比于掺未煅烧煤矸石的混凝土,掺煅烧煤矸石的混凝土的内部结构更致密,但煅烧煤矸石自身的缺陷导致其未获得较大优势。后续研究将致力于更大程度地激发煅烧煤矸石集料的活性以更好地发挥其优势。本研究为煤矸石的大宗高效利用提供试验基础和理论依据。
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关键词:  煤矸石  抗压强度  快速氯离子渗透  抗碳化性能  抗硫酸盐侵蚀  粗集料混凝土    
Abstract: We herein prepared a series of concrete specimens with the mixed coarse aggregate of coal gangue and ordinary gravel, in which the calcined or uncalcined coarse coal gangue equivalently substituted for 0%,30%,50%,70% and 100% of the gravel. The influences of substitution amount and 700 ℃ calcination of coarse coal gangue on compressive strength, anti-carbonation performance, rapid chloride ion penetration and sulfate attack resistance of the concrete were investigated, and the mineral composition changes and the microstructure were observed by XRD and SEM, respectively. Our experiment validated the feasibility of utilizing coal gangue as coarse aggregate for concrete, with a maximum substitution amount determined by the concrete’s designed strength and environmental factors. The existence of the cavities at the bond between the coal gangue and the cementing material inhibits compressive strength and durability of the concrete, but is beneficial to the concrete’s resistance against chloride ion per-meation. The substitution of calcined coarse coal gangue can result in a more dense concrete structure compared to uncalcined coarse coal gangue, and nonetheless holds slight advantage due to its intrinsic defects. Further research is expected to promote the excitation upon the calcined coarse coal gangue aggregate and amplify its advantage. The present work can provide experimental basis and theoretical reference for the highly efficient utilization of coal gangue.
Key words:  coal gangue    compressive strength    rapid chloride ion penetration    anti-carbonation performance    resistance to sulfate attack    coarse aggregate concrete
               出版日期:  2018-07-25      发布日期:  2018-07-31
ZTFLH:  TU528.59  
基金资助: 国家自然科学基金(51578539);北京市自然科学基金(8164061)
作者简介:  马宏强:男,1992年生,博士研究生,主要从事固体废弃物处理及混凝土耐久性能研究 易成:男,1962年生,博士,博士研究生导师,主要从事混凝土耐久性研究
马宏强, 易成, 朱红光, 董作超, 陈宏宇, 王佳欣, 李德毅. 煤矸石集料混凝土抗压强度及耐久性能[J]. 《材料导报》期刊社, 2018, 32(14): 2390-2395.
MA Hongqiang, YI Cheng, ZHU Hongguang, DONG Zuochao, CHEN Hongyu, WANG Jiaxin, LI Deyi. Compressive Strength and Durability of Coal Gangue Aggregate Concrete. Materials Reports, 2018, 32(14): 2390-2395.
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