煤制油炉渣喷射混凝土在巷道支护中的应用
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摘要
以煤制油炉渣作为骨料替代天然砂石制备炉渣喷射混凝土,通过分析煤制油炉渣基本物理性能确认其可行性,优化炉渣混凝土配合比,掺入粉煤灰,改变可再分散乳胶粉、偏高岭土掺量制得相应的炉渣混凝土,测试炉渣混凝土的黏结性与强度性能,观察炉渣微观形貌以及和水泥形成界面结构。结果表明:煤制油炉渣具有与建筑用砂相似的粒度与物理性能,水灰比为0.25,粉煤灰取代率为10%时强度性能良好。可再分散乳胶粉使炉渣混凝土折压比提高,韧性和黏结性大幅改善。粉煤灰和偏高岭土有利于后期强度的发展。最后得到在优化配合比、添加合适外加剂掺量下制备的较低回弹率和粉尘浓度的C25煤制油炉渣喷射混凝土。
The slag shotcrete is prepared by replacing the natural sand with coal-to-liquids slag as aggregate,and the feasibility is confirmed by analyzing the basic physical properties of coal-to-liquids slag,optimizing the mix ratio of slag concrete,mixing fly ash,to change the dispersible polymer powder and the metakaolin content to obtain the corresponding slag concrete,and tested the adhesion and strength properties of the slag concrete.The microstructure of the slag and the interface structure with the cement were observed.The results showed that the coal-to-liquids slag has similar particle size and physical properties as the construction sand,the W/C was 0.25,and the strength of the fly ash was 10%.The redispersible latex powder improved the slag concrete folding ratio,and the toughness and adhesion were greatly improved.Fly ash and metakaolin were beneficial to the development of later strength.Finally,the C25 coal-to-liquids furnace slag shotcrete with lower resilience and dust concentration prepared under the optimized mix ratio and the addition of suitable admixture was obtained.
The slag shotcrete is prepared by replacing the natural sand with coal-to-liquids slag as aggregate,and the feasibility is confirmed by analyzing the basic physical properties of coal-to-liquids slag,optimizing the mix ratio of slag concrete,mixing fly ash,to change the dispersible polymer powder and the metakaolin content to obtain the corresponding slag concrete,and tested the adhesion and strength properties of the slag concrete.The microstructure of the slag and the interface structure with the cement were observed.The results showed that the coal-to-liquids slag has similar particle size and physical properties as the construction sand,the W/C was 0.25,and the strength of the fly ash was 10%.The redispersible latex powder improved the slag concrete folding ratio,and the toughness and adhesion were greatly improved.Fly ash and metakaolin were beneficial to the development of later strength.Finally,the C25 coal-to-liquids furnace slag shotcrete with lower resilience and dust concentration prepared under the optimized mix ratio and the addition of suitable admixture was obtained.
引文
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[2] Zhou W J,Zhu B,Chen D L,et al.Technoeconomic assessment of China′s indirect coal liquefaction projects with different CO2 Capture alternatives[J].Energy,2011,36(11):6559-6566.
[3] 李会玲.煤制油技术发展现状及分析[J].山东化工,2017,46(10):59-61.Li Huiling.Research progress on coal liquefaction technology[J].Shandong Chemical Industry,2017,46(10):59-61.
[4] Wagner N J,Matjie R H,Slaghuis J H,et al.Characterization of unburned carbon present in coarse gasification ash[J].Fuel,2008,87(6):683-691.
[5] 章丽萍,刘青,陈傲蕾,等.煤间接液化固体废物污染特性研究[J].中国矿业大学学报,2015,44(5):931-936.Zhang Liping,Liu Qing,Chen Aolei,et al.Pollution characteristics of residues from indirect coal liquefaction[J].Journal of China University of Mining & Technology,2015,44(5):931-936.
[6] 王雨利,刘素霞,罗树琼,等.利用固体废弃物制备蒸压加气混凝土砌块的研究[J].河南理工大学学报(自然科学版),2012,31(5):613-616.Wang Yuli,Liu Suxia,Luo Shuqiong,et al.Research on preparation of autoclaved aerated concrete block with solid waste[J].Journal of Henan Polytechnic University(Natural Science),2012,31(5):613 -616.
[7] Radoslaw Pomykala.The mechanical properties of coal gasification slag as a component of concrete and binding mixtures[J].Polish Journal of Environmental Studies,2014,23(4):1404-1406.
[8] 张超.粉煤灰和炉渣作为水泥混合材及粉煤灰掺量对不同水胶比混凝土的强度影响研究[D].西安:西安建筑科技大学,2012.
[9] Park S B,Jang Y I,Lee J,et al.An experimental study on the hazard assessment and mechanical properties of porous concrete utilizing coal bottom ash coarse aggregate in Korea[J].Journal of Hazardous Materials,2009,166(41):348-355.
[10] Wongkeo W,Chaipanich A.Compressive strength,microstructure and thermal analysis of autoclaved and air cured structural lightweight concrete made with coal bottom ash and silica fune[J].Materials Science and Engineering:A,2010,527(16):3676-3684.
[11] 杨雷,罗树琼,管学茂,等.粉煤灰对矿用炉渣喷射混凝土性能影响[J].混凝土,2010(3):108-110.Yang Lei,Luo Shuqiong,Guan Xuemao,et al.Influence of fly ash on properties of mining slag shotcrete[J].Concrete,2010(3):108-110.
[12] Isa Yuksela,Turhan Bilirb,Omer Ozkan,et al.Durability of concrete incorporating non-ground blast furnace slag and bottom ash as fine aggregate[J].Building and Environment,2007,42(7):2651-2659.
[13] 王昊.炉渣作为水泥混合材的试验研究及机理分析[D].厦门:厦门大学,2014.