高温后自燃煤矸石骨料混凝土的抗压性能
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摘要
为保证自燃煤矸石骨料混凝土在实际工程中的安全运用,制备了172块取代率均为100%的自燃煤矸石粗、细骨料单掺以及同掺的混凝土立方体试件,进行20,100,300,450,600,750℃下的常温和高温试验.通过测定高温前后的混凝土质量、抗压强度和劈拉强度,研究了自燃煤矸石骨料混凝土的高温后性能.结果表明:随着温度升高,试件表面颜色均由青灰色变为灰褐色,最后变为灰白色;试件表面龟裂逐渐增多,其中单掺自燃煤矸石细骨料的试件出现了爆裂现象;质量烧失率随着温度升高及自燃煤矸石骨料用量的增大而增大;自燃煤矸石骨料混凝土高温后的抗压强度和劈拉强度损失皆小于普通混凝土;根据最高受火温度和质量烧失率建立了高温后自燃煤矸石骨料混凝土抗压强度评估公式,与实测结果比较后发现,两者吻合较好.
In order to ensure the safe application of self-combustion gangue aggregate concrete in practical engineering,172 specimens of concrete,were totally replaced by self-combustion gangue fine aggregate,coarse aggregate or both and tested at the temperature of 20,100,300,450,600,750℃.The mechanical properties of self-combustion gangue aggregate concrete were investigated by measuring the mass,compressive strength and splitting tensile strength of specimens before and after high temperature treatment.The results indicate that with the increase of temperature,color of surface change from steel gray to brown gray,finally to grayish white.Cracks on the surface of specimens increase gradually,and the specimens mixed self-combustion gangue fine aggregate appear bursting.The mass loss rate increases with the increasing temperature and the replacement percentages of the selfcombustion gangue aggregate.The compressive and splitting tensile strength loss of self-combustion gangue aggregate concrete is less than that of ordinary concrete.Based on the highest temperature and the mass loss rate,the formula which is used to calculate the strength of the self-combustion gangue aggregate concrete after high temperature is established,which is in good agreement with the measured results.
In order to ensure the safe application of self-combustion gangue aggregate concrete in practical engineering,172 specimens of concrete,were totally replaced by self-combustion gangue fine aggregate,coarse aggregate or both and tested at the temperature of 20,100,300,450,600,750℃.The mechanical properties of self-combustion gangue aggregate concrete were investigated by measuring the mass,compressive strength and splitting tensile strength of specimens before and after high temperature treatment.The results indicate that with the increase of temperature,color of surface change from steel gray to brown gray,finally to grayish white.Cracks on the surface of specimens increase gradually,and the specimens mixed self-combustion gangue fine aggregate appear bursting.The mass loss rate increases with the increasing temperature and the replacement percentages of the selfcombustion gangue aggregate.The compressive and splitting tensile strength loss of self-combustion gangue aggregate concrete is less than that of ordinary concrete.Based on the highest temperature and the mass loss rate,the formula which is used to calculate the strength of the self-combustion gangue aggregate concrete after high temperature is established,which is in good agreement with the measured results.
引文
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[15]过振海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2002.GUO Zhenhai,SHI Xudong.Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2002.(in Chinese)
[16]郭金纯,余江滔,陆洲导.不同温-时影响下混凝土劈拉强度的试验研究[J].工业建筑,2008,38(9):74-81.GUO Jinchun,YU Jiangtao,LU Zhoudao.Experimental research on the splitting tensile strength of concrete at different temperatures and time[J].Industrial Construction,2008,38(9):74-81.(in Chinese)
[2]陈炜林.煤矸石作为水泥混凝土骨料可行性的基础研究[D].北京:北京工业大学,2010.CHEN Weilin.Feasibility study of coal gangue as aggregate of cement concrete[D].Beijing:Beijing University of Technology,2010.(in Chinese)
[3]肖建庄,黄运标.高温后再生混凝土残余抗压强度[J].建筑材料学报,2006,9(3):255-259.XIAO Jianzhuang,HUANG Yunbiao.Residual compressive strength of recycled concrete after high temperature[J].Journal of Building Materials,2006,9(3):255-259.(in Chinese)
[4]吴波,袁杰,王光远.高温后高强混凝土力学性能的试验研究[J].土木工程学报,2000,33(2):8-12.WU Bo,YUAN Jie,WANG Guangyuan.Experimental research on the mechanical properties of HSC after high temperature[J].China Civil Engineering Journal,2000,33(2):8-12.(in Chinese)
[5]周梅,浦倍超,徐秒,等.附加水及预湿时间对自燃煤矸石砂轻混凝土性能影响[J].硅酸盐通报,2013,32(12):1-6.ZHOU Mei,PU Beichao,XU Miao,et al.Effect of additional water and prewet time on the performance of spontaneous combustion gangue sand lightweight concrete[J].Bulletin of the Chinese Ceramic Society,2013,32(12):1-6.(in Chinese)
[6]肖建庄,黄运标,郑永朝.高温后再生混凝土的残余抗折强度[J].建筑科学与工程学报,2009,26(3):32-36.XIAO Jianzhuang,HUANG Yunbiao,ZHENG Yongchao.Residual flexural strength of recycled concrete after elevatedtemperatures[J].Journal of Architecture and Civil Engineering,2009,26(3):32-36.(in Chinese)
[7]曹万智,孙庆霞,周茗如,等.胶凝材料与骨料品种对混凝土耐高温性能的影响规律研究[J].新型建筑材料,2009(3):17-20.CAO Wanzhi,SUN Qingxia,ZHOU Mingru,et al.Study on effect rule of cementing material and aggregate varieties upon concrete resistance to high temperature[J].New Building Materials,2009(3):17-20.(in Chinese)
[8]蒋玉川,霍达,滕海文,等.页岩陶粒混凝土高温性能特征研究[J].建筑材料学报,2015,36(6):490-496.JIANG Yuchuan,HUO Da,TENG Haiwen,et al.Study on performance of shale ceramsite concrete after exposure to high temperature[J].Journal of Building Materials,2015,36(6):490-496.(in Chinese)
[9]陈宗平,叶培欢,徐金俊,等.高温后钢筋再生混凝土轴压短柱受力性能试验研究[J].建筑结构学报,2013,16(5):117-127.CHEN Zongping,YE Peihuan,XU Jinjun,et al.Mechanical behavior of reinforced recycled aggregate concrete short columns under axial compression after high temperature[J].Journal of Building Structures,2013,16(5):117-127.(in Chinese)
[10]陈宗平,周春恒,李伊,等.高温后再生混凝土力学性能试验研究[J].建筑结构学报,2017,38(12):104-113.CHEN Zongping,ZHOU Chunheng,LI Yi,et al.Research on mechanical behavior of recycled aggregate concrete after high temperatures[J].Journal of Building Structures,2017,38(12):104-113.(in Chinese)
[11]杨再富,钱觉时,唐祖全,等.集料-基体协调性对混凝土强度影响的试验研究[J].材料科学与工艺,2007,15(1):73-76.YANG Zaifu,QIAN Jueshi,TANG Zuquan,et al.Effect of aggregate-matrix harmony on the strength of concrete[J].Materials Science&Technology,2007,15(1):73-76.(in Chinese)
[12]吴秀峰,周梅,崔正龙.自燃煤矸石粗集料对混凝土强度影响的试验研究[J].工业建筑,2009,39(3):81-85.WU Xiufeng,ZHOU Mei,CUI Zhenglong.The experiment research on concrete strength influence of self combustion coal gangue coarse aggregate[J].Industrial Construction,2009,39(3):81-85.(in Chinese)
[13]胡翠平,徐玉野,罗漪,等.高温作用后混凝土抗拉强度的影响分析[J].华侨大学学报,2014,35(2):196-201.HU Cuiping,XU Yuye,LUO Yi,et al.Experimental study onthe tensile strength of concrete after high temperature[J].Journal of Huaqiao University,2014,35(2):196-201.(in Chinese)
[14]徐明,王韬,陈忠范.高温后再生混凝土单轴受压应力-应变关系试验研究[J].建筑结构学报,2015,36(2):157-164.XU Ming,WANG Tao,CHEN Zhongfan.Experimental research on uniaxial compressive stress-strain relationship of recycled concrete after high temperature[J].Journal of Building Structures,2015,36(2):157-164.(in Chinese)
[15]过振海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2002.GUO Zhenhai,SHI Xudong.Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2002.(in Chinese)
[16]郭金纯,余江滔,陆洲导.不同温-时影响下混凝土劈拉强度的试验研究[J].工业建筑,2008,38(9):74-81.GUO Jinchun,YU Jiangtao,LU Zhoudao.Experimental research on the splitting tensile strength of concrete at different temperatures and time[J].Industrial Construction,2008,38(9):74-81.(in Chinese)