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
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.
1 Li Y J, Xing Y, Zhang X, et al. Experimental study on the durability of the concrete with coal gangue aggregate[J]. Journal of China Coal Society,2013,38(7):1215(in Chinese). 李永靖,邢洋,张旭,等.煤矸石骨料混凝土的耐久性试验研究[J].煤炭学报,2013,38(7):1215. 2 Li D X, Song X Y, Gong C C, et al. Research on cementitious behavior and mechanism of pozzolanic cement with coal gangue[J]. Cement and Concrete Research,2006,36(9):1752. 3 Zhang J X, Duan P X. Chloride consolidation and penetration beha-vior in harden mortar of gangue added cement[J]. Advanced Mate-rials Research,2012,374-377:1831. 4 Wang Z S, Wang L J, Su H L, et al. Optimization of coarse aggregate content based on efficacy coefficient method[J]. Journal of Wuhan University of Technology (Materials Science Edition),2011,26(2):330. 5 Zhang J X, Chen W L, Yang R J. Experimental study on basic pro-perties of coal gangue aggregate[J]. Journal of Building Materials,2010,13(6):739(in Chinese). 张金喜,陈炜林,杨荣俊. 煤矸石集料基本性能的试验研究[J].建筑材料学报,2010,13(6):739. 6 Wang Jinman, Qin Qian, Hu S J,et al. A concrete material with waste coal gangue and fly ash used for farmland drainage in high groundwater level areas[J]. Journal of Cleaner Production,2016,112(1):631. 7 Cong X Y, Lu S, Yao Y,et al. Fabrication and characterization of self-ignition coal gangue autoclaved aerated concrete[J]. Materials and Design,2016,97:155. 8 Yao Y, Wu H, Wang L. The microstructure research on interfacial transition zone of filling material containing FA and coal gangue[J]. Advanced Materials Research,2011,287-290:1125. 9 Meddah M S, Zitouni S, et al. Effect of content and particle size distribution of coarse aggregate on the compressive strength of concrete[J]. Construction and Building Materials,2010,24(4):505. 10 Zhang J X, Chen W L, Jin S S, et al. Investigation on durability of coal gangue aggregate concrete[J]. Journal of Beijing University of Technology,2011,37(1):116(in Chinese). 张金喜,陈炜林,金珊珊,等.煤矸石集料混凝土耐久性研究[J].北京工业大学学报,2011,37(1):116. 11 Li Y J, Yan X P, Zhang X, et al. Experimental research on seismic behavior of reinforced concrete column composed of coal gangue aggregate[J]. Journal of the China Society,2013,38(6):1006(in Chinese). 李永靖,闫宣澎,张旭,等.煤矸石骨料钢筋混凝土柱的抗震性能试验研究[J].煤炭学报,2013,38(6):1006. 12 Zhang Y, Ma G, Liu Y, et al. Mix design for thermal insulation concrete using waste coal gangue as aggregate[J]. Materials Research Innovations,2015,19(5):878. 13 Wang Q, Liu S, Wang J B, et al. Research on resistance to chloride ion of the coal gangue coarse aggregate concrete[J]. Concrete,2016,332(8):36(in Chinese). 王晴,刘锁,王继博,等.煤矸石粗集料混凝土抗氯离子渗透性能的研究[J].混凝土,2016,332(8):36. 14 Eric Ryan, Edwin Burdette, Ryan Ankabrandt, et al. Comparison of two methods to assess the resistance of concrete to chloride ion penetration[J]. Journal of Materials in Civil Engineering,2014,26(4):698. 15 Fang X W, Shen C N, Yang D B, et al. Investigations of influence factor on the rate of concrete sulfate attack[J]. Journal of Building Materials,2007,10(1):89(in Chinese). 方祥位,申春妮,杨德斌,等.混凝土硫酸盐侵蚀速度影响因素研究[J].建筑材料学报,2007,10(1):89. 16 Yang Q B, Lv M X, Luo Y B, et al. Effects of surface-activated coal gangue aggregates on properties of cement-based materials[J]. Journal of Wuhan University of Technology(Materials Science Edition),2013,28(6):1118. 17 Li Y, Yao Y, Liu X M, et al. Improvement on pozzolanic reactivity of coal gangue by integrated thermal and chemical activative[J]. Fuel,2013,109:527. 18 Dong Z C, Xia J W, Fan C, et al. Activity of calcined coal gangue fine aggregate and its effect on the mechanical behavior of cement mortar[J]. Construction and Building Materials,2015,100:63. 19 Song X Y, Zhang K, Han J Y, et al. Effect of thermal activated coal gangue on pozzolanic effect and cement properties[J]. Materials Review B:Research Papers,2011,25(11):118(in Chinese). 宋旭艳,张康,韩静云,等.热活化煤矸石的火山灰效应及其对水泥性能的影响[J].材料导报:研究篇,2011,25(11):118. 20 Shi H S, Shi T, Chen B C, et al. Research of chloride ion diffusivity in reactive powder concrete with blast-furnace slag[J]. Journal of Tongji University(Natural Science),2006,34(1):93(in Chinese). 施惠生,施韬,陈宝春,等.掺矿渣活性粉末混凝土的抗氯离子渗透性研究[J].同济大学学报(自然科学版),2006,34(1):93. 21 Wu D, Zhang Y L, Liu Y C. Mechanical performance and ultrasonic properties of cemented gangue backfill with admixture of fly ash[J]. Ultrasonics,2016,64:89. 22 Li D X, Song X Y, Gong C C, et al. Research on cementitious behavior and mechanism of pozzolanic cement with coal gangue[J]. Cement and Concrete Research,2006,36(9):1752. 23 Zhang L M, Jiang W H. A study on carbonation of concrete in natural condition and its corrclation with artificial accelerated carbonation[J]. Xi’an University of Architecture and Technology(Natural Science),1990(3):207(in Chinese). 张令茂,江文辉.混凝土自然碳化及其与人工加速碳化的相关性研究[J].西安建筑科技大学学报(自然科学版),1990(3):207.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2018, Vol. 32 
