钢纤维轻骨料混凝土单轴受压应力-应变曲线研究
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摘要
采用100%烧结膨胀页岩陶粒作为粗细骨料,以占胶凝材料总质量20%的粉煤灰等质量替代水泥作为胶凝材料,按绝对体积直接计算法设计并制备了钢纤维全轻混凝土。以水泥强度等级(42. 5和52. 5)、钢纤维体积率(0%、0. 4%、0. 8%、1. 2%、1. 6%)为参数,进行了钢纤维全轻混凝土轴心抗压试验研究,分析了钢纤维全轻混凝土单轴受压破坏形态及其应力-应变曲线特征。结果表明:钢纤维全轻混凝土单轴受压应力-应变曲线的峰值应力及其对应应变随钢纤维体积率和水泥强度等级的提高呈现增大趋势;钢纤维体积率的增加使试件的破坏形态由脆性向塑性转变。结合相关文献研究成果,对轻骨料混凝土(砂轻混凝土、全轻混凝土)和钢纤维轻骨料混凝土(钢纤维砂轻混凝土、钢纤维全轻混凝土)单轴受压应力-应变曲线进行了综合分析,提出了两类混凝土单轴受压应力-应变曲线统一计算模型及其特征点计算公式。
Steel fiber reinforced all-lightweight-aggregate concrete( a SFRLAC) was developed by using the direct design method of absolute volume. In the concrete mix,the fine and coarse aggregates consisted of 100% sintering expanded shale,while 20 %( by total mass cementitious materials) of the cement was replaced by fly ash. Based on an experimental study on a SFRLAC prisms under uniaxial compression,the failure modes and characteristics of stressstrain curves were discussed. The variables in the experimental study included the strength grade of cement( i. e.42. 5 and 52. 5 ordinary silicate cement) and the volume fraction of steel fibers( i. e. ranged from 0 to 1. 6%). Test results show that the peak-stress and peak strain at stress-strain curves of a SFRLAC present on increasing trend with the increase of strength grade of cement and the volume fraction of steel fiber. And the failure modes of specimens change from brittle failure to plastic failure with the increase of volume fraction of steel fiber. The test results were used together with the results in previous studies for a comprehensive analysis of the stress-strain curves of lightweight aggregate concrete( including sanded-lightweight concrete and all-lightweight-aggregate concrete) and steel fiber reinforced lightweight aggregate concrete,based on which a unified stress-strain model was proposed,with formulas for predictions of the characteristic points on the stress-strain curve.
Steel fiber reinforced all-lightweight-aggregate concrete( a SFRLAC) was developed by using the direct design method of absolute volume. In the concrete mix,the fine and coarse aggregates consisted of 100% sintering expanded shale,while 20 %( by total mass cementitious materials) of the cement was replaced by fly ash. Based on an experimental study on a SFRLAC prisms under uniaxial compression,the failure modes and characteristics of stressstrain curves were discussed. The variables in the experimental study included the strength grade of cement( i. e.42. 5 and 52. 5 ordinary silicate cement) and the volume fraction of steel fibers( i. e. ranged from 0 to 1. 6%). Test results show that the peak-stress and peak strain at stress-strain curves of a SFRLAC present on increasing trend with the increase of strength grade of cement and the volume fraction of steel fiber. And the failure modes of specimens change from brittle failure to plastic failure with the increase of volume fraction of steel fiber. The test results were used together with the results in previous studies for a comprehensive analysis of the stress-strain curves of lightweight aggregate concrete( including sanded-lightweight concrete and all-lightweight-aggregate concrete) and steel fiber reinforced lightweight aggregate concrete,based on which a unified stress-strain model was proposed,with formulas for predictions of the characteristic points on the stress-strain curve.
引文
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[7]李长永,聂旭,康星星,等.钢纤维全轻混凝土叠浇梁斜截面抗剪疲劳性能试验研究[J].华北水利水电大学学报(自然科学版),2017,38(6):16-24.(LI Changyong,NIE Xu,KANG Xingxing,et al.Experimental study on shear fatigue behavior of reinforced SFRFLC superposed beams[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2017,38(6):16-24.(in Chinese))
[8]潘丽云,袁浩,赵顺波.混合纤维增强全轻混凝土早龄期抗裂性试验研究[J].水力发电,2011,37(9):95-97.(PAN Liyun,YUAN Hao,ZHAOShunbo.Experimental study on early-age crackingresistance of hybrid fiber reinforced full-lightweight concrete[J].Water Power,2011,37(9):95-97.(in Chinese))
[9]ZHAO Shunbo,LI Changyong,ZHAO Mingshuang,et al.Experimental study on autogenous and drying shrinkage of lightweight-aggregate concrete reinforced by steel fibers[J].Advances in Materials Science and Engineering,2016,DOI:10.1155/2016/2589383.
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[11]LI Changyong,CHEN Huai,ZHAO Shunbo.Mechanical properties of steel fiber reinforced lightaggregate concrete[J].Advanced Materials Research,2011,366:12-15.
[12]GNEYISI E,GESOGLU M,ZTURAN T,et al.Fracture behavior and mechanical properties of concrete with artificial lightweight aggregate and steel fiber[J].Construction and Building Materials,2015,84:156-168.
[13]CAMPIONE G,LIDIA M.Behavior in compression of lightweight fiber reinforced concrete confined with transverse steel reinforcement[J].Cement and Concrete Composites,2004,26(6):645-656.
[14]刘汉勇,王立成,宋玉普,等.钢纤维高强轻骨料混凝土力学性能的试验研究[J].建筑结构学报,2007,28(5):110-117.(LIU Hanyong,WANGLicheng,SONG Yupu,et al.Experimental study on mechanical properties of steel fiber reinforced highstrength lightweight aggregate concrete[J].Journal of Building Structures,2007,28(5):110-117.(in Chinese))
[15]LIBRE N A,SHEKARCHI M,MAHOUTIAN M,et al.Mechanical properties of hybrid fiber reinforced lightweight aggregate concrete made with natural pumice[J].Construction and Building Materials,2011,25(5):2458-2464.
[16]KAYALI O,HAQUE M N,ZHU B.Some characteristics of high strength fiber reinforced lightweight aggregate concrete[J].Cement and Concrete Composites,2003,25(2):207-213.
[17]DZGN O A,GL R,AYDIN A C.Effect of steel fibers on the mechanical properties of natural lightweight aggregate concrete[J].Materials Letters,2005,59(27):3357-3363.
[18]SHAFIGH P,MAHMUD H,JUMAAT M Z.Effect of steel fiber on the mechanical properties of oil palm shell lightweight concrete[J].Materials and Design,2011,32(7):3926-3932.
[19]潘丽云,陈梅华,沈泽,等.钢纤维轻骨料粉煤灰混凝土配合比与工作性能试验研究[J].华北水利水电大学学报(自然科学版),2015,36(6):32-34.(PANLiyun,CHEN Meihua,SHEN Ze,et al.Experimental study on mix proportion and workability of of steel fiber reinforced full-lightweight-aggregate concrete[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2015,36(6):32-34.(in Chinese))
[20]李晓克,沈泽,陈梅华,等.高性能钢纤维轻骨料粉煤灰混凝土抗压性能试验研究[J].广西大学学报(自然科学版),2015,40(1):106-111.(LI Xiaoke,SHEN Ze,CHEN Meihua,et al.Experimental study on compressive properties of steel-fiber-reinforced lightweight-aggregate concrete[J].Journal of Guangxi University(Natural Science Edition),2015,40(1):106-111.(in Chinese))
[21]李晓克,张晓燕,李牧青,等.钢纤维全轻混凝土长期强度和碳化试验[J].土木工程与管理学报,2017,34(2):46-50.(LI Xiaoke,ZHANG Xiaoyan,LI Muqing,et al.Experiments on developments of strength and carbonization of steel fiber reinforced fulllightweight concrete[J].Journal of Civil Engineering and Management,2017,34(2):46-50.(in Chinese))
[22]过镇海,张秀琴,张达成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982,3(1):1-12.(GUO Zhenhai,ZHANG Xiuqin,ZHANGDacheng,et al.Experimental investigation of complete stress-strain curve of concrete[J].Journal of Building Structures,1982,3(1):1-12.(in Chinese))
[23]王玉梅.自密实轻骨料混凝土的研究应用[D].长沙:湖南科技大学,2012.(WANG Yumei.The research on self-compacting lightweight aggregate concrete[D].Changsha:Hunan University of Science and Technology,2012.(in Chinese))
[24]王振宇,丁建彤,郭玉顺.结构轻骨料混凝土的应力-应变全曲线[J].混凝土,2005(3):39-42.(WANG Zhenyu,DING Jiantong,GUO Yushun.Stress-strain curves of structural lightweight aggregate concretes[J].Concrete,2005(3):39-42.(in Chinese))
[25]蒋思晨.混杂纤维轻骨料混凝土力学性能及抗冻性能试验研究[D].呼和浩特:内蒙古农业大学,2012.(JIANG Sichen.Experimental research on mechanical properties and frost-resistance of hybrid fibers light-weight aggregate concrete[D].Hohhot:Inner Mongolia Agricultural University,2012.(in Chinese))
[26]王玉起,王春瑞,陈云霞,等.混凝土轴心受压时的应力应变关系[J].天津大学学报,1983(2):29-40.(WANG Yuqi,WANG Chunrui,CHEN Yunxia,et al.Stress-strain relationships for concrete in axial compression[J].Journal of Tianjin University,1983(2):29-40.(in Chinese))
[27]曹祖同,陈云霞,王玲勇,等.陶粒混凝土棱柱体应力-应变全曲线的研究[J].天津大学学报,1984(3):97-107.(CAO Zutong,CHEN Yunxia,WANGLingyong,et al.Experimental investigation on the complete stress-strain curve of light aggregate(keramzite)concrete prisms unconfined and confined by square stirrups[J].Journal of Tianjin University,1984(3):97-107.(in Chinese))
[28]SHANNAG M J.Characteristics of lightweight concrete containing mineral admixtures[J].Construction&Building Materials,2011,25(2):658-662.
[29]混凝土结构设计规范:GB 50010-2010[S].北京:中国建筑工业出版社,2010.(Code for design of concrete structures:GB 50010-2010[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
[30]赵顺波,杜晖,钱晓军,等.钢纤维高强混凝土配合比直接设计方法研究[J].土木工程学报,2008,41(7):1-6.(ZHAO Shunbo,DU Hui,QIAN Xiaojun,et al.Study on direct design method of steel fiber reinforced high-strength concrete[J].China Civil Engineering Journal,2008,41(7):1-6.(in Chinese))
[31]钢纤维混凝土:JG/T 472-2015[S].北京:中国标准出版社,2015.(Steel fiber reinforced concrete:JG/T472-2015[S].Beijing:Standards Press of China,2015.(in Chinese))
[32]钢纤维混凝土试验方法标准:CECS 13:2009[S].北京:中国计划出版社,2010.(Test methods for steel fiber reinforced concrete:CECS 13:2009[S].Beijing:China Planning Press,2010.(in Chinese))
[33]张晓燕,曹晨杰,孙丽,等.钢纤维混凝土轴压应力-应变曲线试验研究[J].混凝土,2013(5):24-27.(ZHANG Xiaoyan,CAO Chenjie,SUN Li,et al.Experimental study on axial compressive stress-strain curve of SFRC[J].Concrete,2013(5):24-27.(in Chinese))
[2]KOCKAL N U,OZTURAN T.Effects of lightweight fly ash aggregate properties on the behavior of lightweight concretes[J].Journal of Hazardous Materials,2005,179(1):954-965.
[3]李长永,赵明爽,陈彦磊,等.高强全轻混凝土基本性能试验研究[J].河南大学学报(自然科学版),2014,44(6):749-752.(LI Changyong,ZHAOMingshuang,CHEN Yanlei,et al.Experimental study on basic properties of high-strength full-lightweight concrete with expanded-shale[J].Journal of Henan University(Natural Science),2014,44(6):749-752.(in Chinese))
[4]叶列平,孙海林,陆新征,等.高强轻骨料混凝土结构:性能、分析与计算[M].北京:科学出版社,2009:7-82.(YE Lieping,SUN Hailin,LU Xinzheng,et al.High-strength lightweight aggregate concrete structures behaviors,analysis and calculation[M].Beijing:Science Press,2009:7-82.(in Chinese))
[5]易伟建,丁雅博,陈晖.轻骨料混凝土无腹筋梁受剪性能试验研究[J].建筑结构学报,2017,38(6):123-132.(YI Weijian,DING Yabo,CHEN Hui.Experimental study on shear behavior of lightweight aggregate concrete beams without stirrups[J].Journal of Building Structures,2017,38(6):123-132.(in Chinese))
[6]李长永,赵顺波,陈淮,等.钢筋钢纤维全轻混凝土叠浇梁受弯承载力试验研究[J].建筑结构学报,2015,36(增刊2):257-264.(LI Changyong,ZHAOShunbo,CHEN Huai,et al.Experimental study on flexural capacity of reinforced SFRFLC superposed beams[J].Journal of Building Structures,2015,36(Suppl.2):257-264.(in Chinese))
[7]李长永,聂旭,康星星,等.钢纤维全轻混凝土叠浇梁斜截面抗剪疲劳性能试验研究[J].华北水利水电大学学报(自然科学版),2017,38(6):16-24.(LI Changyong,NIE Xu,KANG Xingxing,et al.Experimental study on shear fatigue behavior of reinforced SFRFLC superposed beams[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2017,38(6):16-24.(in Chinese))
[8]潘丽云,袁浩,赵顺波.混合纤维增强全轻混凝土早龄期抗裂性试验研究[J].水力发电,2011,37(9):95-97.(PAN Liyun,YUAN Hao,ZHAOShunbo.Experimental study on early-age crackingresistance of hybrid fiber reinforced full-lightweight concrete[J].Water Power,2011,37(9):95-97.(in Chinese))
[9]ZHAO Shunbo,LI Changyong,ZHAO Mingshuang,et al.Experimental study on autogenous and drying shrinkage of lightweight-aggregate concrete reinforced by steel fibers[J].Advances in Materials Science and Engineering,2016,DOI:10.1155/2016/2589383.
[10]GAO Jianming,SUN Wei,MORINO K.Mechanical properties of steel fiber-reinforced,high-strength,lightweight concrete[J].Cement and Concrete Composites,1997,19(4):307-313.
[11]LI Changyong,CHEN Huai,ZHAO Shunbo.Mechanical properties of steel fiber reinforced lightaggregate concrete[J].Advanced Materials Research,2011,366:12-15.
[12]GNEYISI E,GESOGLU M,ZTURAN T,et al.Fracture behavior and mechanical properties of concrete with artificial lightweight aggregate and steel fiber[J].Construction and Building Materials,2015,84:156-168.
[13]CAMPIONE G,LIDIA M.Behavior in compression of lightweight fiber reinforced concrete confined with transverse steel reinforcement[J].Cement and Concrete Composites,2004,26(6):645-656.
[14]刘汉勇,王立成,宋玉普,等.钢纤维高强轻骨料混凝土力学性能的试验研究[J].建筑结构学报,2007,28(5):110-117.(LIU Hanyong,WANGLicheng,SONG Yupu,et al.Experimental study on mechanical properties of steel fiber reinforced highstrength lightweight aggregate concrete[J].Journal of Building Structures,2007,28(5):110-117.(in Chinese))
[15]LIBRE N A,SHEKARCHI M,MAHOUTIAN M,et al.Mechanical properties of hybrid fiber reinforced lightweight aggregate concrete made with natural pumice[J].Construction and Building Materials,2011,25(5):2458-2464.
[16]KAYALI O,HAQUE M N,ZHU B.Some characteristics of high strength fiber reinforced lightweight aggregate concrete[J].Cement and Concrete Composites,2003,25(2):207-213.
[17]DZGN O A,GL R,AYDIN A C.Effect of steel fibers on the mechanical properties of natural lightweight aggregate concrete[J].Materials Letters,2005,59(27):3357-3363.
[18]SHAFIGH P,MAHMUD H,JUMAAT M Z.Effect of steel fiber on the mechanical properties of oil palm shell lightweight concrete[J].Materials and Design,2011,32(7):3926-3932.
[19]潘丽云,陈梅华,沈泽,等.钢纤维轻骨料粉煤灰混凝土配合比与工作性能试验研究[J].华北水利水电大学学报(自然科学版),2015,36(6):32-34.(PANLiyun,CHEN Meihua,SHEN Ze,et al.Experimental study on mix proportion and workability of of steel fiber reinforced full-lightweight-aggregate concrete[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2015,36(6):32-34.(in Chinese))
[20]李晓克,沈泽,陈梅华,等.高性能钢纤维轻骨料粉煤灰混凝土抗压性能试验研究[J].广西大学学报(自然科学版),2015,40(1):106-111.(LI Xiaoke,SHEN Ze,CHEN Meihua,et al.Experimental study on compressive properties of steel-fiber-reinforced lightweight-aggregate concrete[J].Journal of Guangxi University(Natural Science Edition),2015,40(1):106-111.(in Chinese))
[21]李晓克,张晓燕,李牧青,等.钢纤维全轻混凝土长期强度和碳化试验[J].土木工程与管理学报,2017,34(2):46-50.(LI Xiaoke,ZHANG Xiaoyan,LI Muqing,et al.Experiments on developments of strength and carbonization of steel fiber reinforced fulllightweight concrete[J].Journal of Civil Engineering and Management,2017,34(2):46-50.(in Chinese))
[22]过镇海,张秀琴,张达成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982,3(1):1-12.(GUO Zhenhai,ZHANG Xiuqin,ZHANGDacheng,et al.Experimental investigation of complete stress-strain curve of concrete[J].Journal of Building Structures,1982,3(1):1-12.(in Chinese))
[23]王玉梅.自密实轻骨料混凝土的研究应用[D].长沙:湖南科技大学,2012.(WANG Yumei.The research on self-compacting lightweight aggregate concrete[D].Changsha:Hunan University of Science and Technology,2012.(in Chinese))
[24]王振宇,丁建彤,郭玉顺.结构轻骨料混凝土的应力-应变全曲线[J].混凝土,2005(3):39-42.(WANG Zhenyu,DING Jiantong,GUO Yushun.Stress-strain curves of structural lightweight aggregate concretes[J].Concrete,2005(3):39-42.(in Chinese))
[25]蒋思晨.混杂纤维轻骨料混凝土力学性能及抗冻性能试验研究[D].呼和浩特:内蒙古农业大学,2012.(JIANG Sichen.Experimental research on mechanical properties and frost-resistance of hybrid fibers light-weight aggregate concrete[D].Hohhot:Inner Mongolia Agricultural University,2012.(in Chinese))
[26]王玉起,王春瑞,陈云霞,等.混凝土轴心受压时的应力应变关系[J].天津大学学报,1983(2):29-40.(WANG Yuqi,WANG Chunrui,CHEN Yunxia,et al.Stress-strain relationships for concrete in axial compression[J].Journal of Tianjin University,1983(2):29-40.(in Chinese))
[27]曹祖同,陈云霞,王玲勇,等.陶粒混凝土棱柱体应力-应变全曲线的研究[J].天津大学学报,1984(3):97-107.(CAO Zutong,CHEN Yunxia,WANGLingyong,et al.Experimental investigation on the complete stress-strain curve of light aggregate(keramzite)concrete prisms unconfined and confined by square stirrups[J].Journal of Tianjin University,1984(3):97-107.(in Chinese))
[28]SHANNAG M J.Characteristics of lightweight concrete containing mineral admixtures[J].Construction&Building Materials,2011,25(2):658-662.
[29]混凝土结构设计规范:GB 50010-2010[S].北京:中国建筑工业出版社,2010.(Code for design of concrete structures:GB 50010-2010[S].Beijing:China Architecture&Building Press,2010.(in Chinese))
[30]赵顺波,杜晖,钱晓军,等.钢纤维高强混凝土配合比直接设计方法研究[J].土木工程学报,2008,41(7):1-6.(ZHAO Shunbo,DU Hui,QIAN Xiaojun,et al.Study on direct design method of steel fiber reinforced high-strength concrete[J].China Civil Engineering Journal,2008,41(7):1-6.(in Chinese))
[31]钢纤维混凝土:JG/T 472-2015[S].北京:中国标准出版社,2015.(Steel fiber reinforced concrete:JG/T472-2015[S].Beijing:Standards Press of China,2015.(in Chinese))
[32]钢纤维混凝土试验方法标准:CECS 13:2009[S].北京:中国计划出版社,2010.(Test methods for steel fiber reinforced concrete:CECS 13:2009[S].Beijing:China Planning Press,2010.(in Chinese))
[33]张晓燕,曹晨杰,孙丽,等.钢纤维混凝土轴压应力-应变曲线试验研究[J].混凝土,2013(5):24-27.(ZHANG Xiaoyan,CAO Chenjie,SUN Li,et al.Experimental study on axial compressive stress-strain curve of SFRC[J].Concrete,2013(5):24-27.(in Chinese))