煤矸石作为骨料对不同水泥基材料耐久性影响
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摘要
研究了中国四个地区所产煤矸石的基本性能及其作为骨料对C30混凝土和CFG桩抗冻性和抗酸侵蚀性能的影响。结果表明:所选各煤矸石主要组成分为石英、蒙脱石和菱铁矿等矿物,但氧化含量有较大不同;泡水饱和状态下各煤矸石单轴抗压强度均降低55%以上;冻融循环28次后,各煤矸石质量损失按产地从大到小为榆林、长治、太原和许昌;酸侵蚀下,长治煤矸石的压碎指标较酸侵蚀前增大最明显。许昌煤矸石配制的C30混凝土,当煤矸石取代石灰石粗骨料大于30%后,抗冻性能显著降低,随煤矸石掺量的增加,C30混凝土抗酸性能降低,但不显著。酸侵蚀140 d时,CFG-长治质量损失率大于5%,抗压腐蚀系数低于0. 8,抗酸性能显著降低,其他煤矸石CFG桩抗酸性能变化不显著。
The basic properties of coal gangue produced in four regions in China were investigated,and the effect of coal gangue as aggregate in cementitious materials on the frost resistance and the acid corrosion resistance were studied. Results show that the main components of each coal gangue selected are quartz,montmorillonite,siderite and other mineral,but the oxidation content is quite different. The uniaxial compressive strength of each coal gangue is reduced by more than 55% after complete soaking. After 28 freeze-thaw cycles,the order of mass loss rate of each coal gangue is Yulin,Changzhi,Taiyuan,Xuchang. After acid corrosion,the crushing index of coal gangue produced in Changzhi increase is the biggest. For the concrete with C30 grade incorporating Xuchang coal gangue,when the replacement of coal gangue to stonelime is beyond 30%,the frost resistance of concrete decreases obviously. With the coal gangue content increasing,concrete acid corrosion resistance is on the decline,but not significant. For the CFG-Changzhi,after 140 d acid corrosion,the mass loss is greater than 5%,the compressive corrosion coefficient is lower than 0. 8 and its acid corrosion resistance reduced significantly,but the changes of other kinds of coal gangue CFG's acid corrosion resistance is not significantly.
The basic properties of coal gangue produced in four regions in China were investigated,and the effect of coal gangue as aggregate in cementitious materials on the frost resistance and the acid corrosion resistance were studied. Results show that the main components of each coal gangue selected are quartz,montmorillonite,siderite and other mineral,but the oxidation content is quite different. The uniaxial compressive strength of each coal gangue is reduced by more than 55% after complete soaking. After 28 freeze-thaw cycles,the order of mass loss rate of each coal gangue is Yulin,Changzhi,Taiyuan,Xuchang. After acid corrosion,the crushing index of coal gangue produced in Changzhi increase is the biggest. For the concrete with C30 grade incorporating Xuchang coal gangue,when the replacement of coal gangue to stonelime is beyond 30%,the frost resistance of concrete decreases obviously. With the coal gangue content increasing,concrete acid corrosion resistance is on the decline,but not significant. For the CFG-Changzhi,after 140 d acid corrosion,the mass loss is greater than 5%,the compressive corrosion coefficient is lower than 0. 8 and its acid corrosion resistance reduced significantly,but the changes of other kinds of coal gangue CFG's acid corrosion resistance is not significantly.
引文
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15 任梦溪,郑刘根,程桦,等.淮北临涣采煤沉陷区水域水体污染源解析[J].中国科学技术大学学报,2016(8):680-688Ren Mengxi,Zheng Liugen,Cheng Hua,et al. Pollutions source apportionment of Linhuan coal mining subsidence water area from Huaibei Coalfield[J]. Journal of University of Science and Technology of China,2016(8):680-688
2 Wang B,Liu X,Zhang J,et al. Pyrolysis behavior of corncob and coal gangue with modified medical stone and HZSM-5 based additives[J]. Fuel,2018,211:816-826
3 Wang J,Qin Q,Hu S,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,2016,112:631-638
4 陈富松,袁闯,李国富,等.煤矸石的综合利用研究进展[J].产业与科技论坛,2017,16(2):72-73Chen Fusong,Yuan Chuang,Li Guofu,et al. Research progress on comprehensive utilization of coal gangue[J]. Industrial&Science Tribune,2017,16(2):72-73
5 杨果林,张梓振,杜勇立,等.煤矸石组合式加筋挡土墙现场试验研究[J].铁道科学与工程学报. 2017,14(7):1382-1390Yang Guolin,Zhang Zizhen,Du Yongli,et al. Field test study on coal gangue combined reinforced retaining wall[J]. Journal of Railway Science and Engineering,2017,14(7):1382-1390
6 Wu D,Hou Y,Deng T,et al. Thermal,hydraulic and mechanical performances of cemented coal gangue-fly ash backfill[J]. International Journal of Mineral Processing. 2017,162:12-18
7 王亮,王志伟.煤矸石细骨料混凝土强度及耐久性能研究[J].混凝土,2018(3):153-155Wang Liang,Wang Zhiwei. Study on strength and durability of coal gangue fine aggregate concrete[J]. Concrete,2018(3):153-155
8 周梅,牟爽,王强.等强条件下集料级配对煤矸石集料混凝土工作性与强度影响[J].硅酸盐通报,2012(6):1529-1534Zhou Mei,Mu Shuang,Wang Qiang,et al. Study on the influence of aggregate gradation on coal gangue aggregate concrete workability and harden strength under same compressive Strength[J]. Bulletin of the Chinese Ceramic Society,2012(6):1529-1534
9 段晓牧,夏军武,杨风州,等.煤矸石集料性质对混凝土力学性能影响的试验研究[J].工业建筑,2014,44(3):114-118Duan Xiaomu,Xia Junwu,Yang Fengzhou,et al. Experimental research on the influence of coal gangue aggregate behavior on the mechanical properties of concrete[J]. Industrial Construction,2014,44(3):114-118
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):116-125
11 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(7):1215-1219Li Yongjing,Xing Yang,Zhang Xu,et al. Experimantal study on the durability of the concrete with coal gangue aggregate[J]. Journal of China Coal Society,2013(7):1215-1219
12 Guo J M,Zhu L L. Experimental research on durabilities of coal gangue concrete[J]. Advanced Materials Research,2011,306-307(7):1569-1575
13 Tang Q,Li L,Zhang S,et al. Characterization of heavy metals in coal gangue-reclaimed soils from a coal mining area[J]. Journal of Geochemical Exploration,2018,186:1-11
14 马腾,王焰新,马瑞,等.太原盆地区碳酸盐岩中-低温地热系统演化[J].地球科学-中国地质大学学报,2012,37(2):229-237Ma Teng,Wang Yanxin,Ma Rui,et al. Evolution of middle-low temperature carbonate geothermal system in Taiyuan,Northern China[J]. Earth Science-Journal of China University of Geosciences,2012,37(2):229-237
15 任梦溪,郑刘根,程桦,等.淮北临涣采煤沉陷区水域水体污染源解析[J].中国科学技术大学学报,2016(8):680-688Ren Mengxi,Zheng Liugen,Cheng Hua,et al. Pollutions source apportionment of Linhuan coal mining subsidence water area from Huaibei Coalfield[J]. Journal of University of Science and Technology of China,2016(8):680-688