机制砂钢筋混凝土梁受弯与受剪性能试验研究
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摘要
为了从机制砂骨料的细观指标出发,研究机制砂混凝土梁的受弯与受剪性能,选取了天然砂和3种机制砂,对比了不同骨料的颗粒级配、细度模数、石粉含量、MB值等材性指标,利用图像分析处理技术获取不同骨料的形状参数,通过试验对比了不同细骨料混凝土的工作性能、抗压强度和体积稳定性能;分别设计了受弯和受剪天然砂及机制砂钢筋混凝土梁,通过荷载试验,比较不同细骨料混凝土梁的开裂荷载、挠度曲线和承载力等受力性能指标。研究结果表明:采用延性参数与圆度参数可以反映不同类型骨料间的颗粒形状差异,颗粒级配合理、形状参数良好的机制砂混凝土的强度和长期干缩性能可以达到甚至超过天然砂混凝土的,机制砂和天然砂钢筋混凝土梁的受弯、受剪破坏形态相似,承载力与其混凝土强度相关,可采用现行设计方法对机制砂混凝土梁进行承载力设计。天然砂钢筋混凝土梁抗裂能力略优于机制砂钢筋混凝土梁的,为此,采用现行开裂荷载计算方法会高估机制砂混凝土梁的开裂荷载,建议对机制砂钢筋混凝土梁的开裂荷载设计进行适度调整。
In order to explain the macro flexural behavior and shear behavior of concrete beams made with manufactured sand from the meso-index of manufactured sands,natural sand and three kinds of manufactured sands were selected in this research. The material indexes of gradation,fineness modulus,powder content,MB value and so on were compared. The digital image process method was used to obtain the shape parameters of different aggregates.The concrete workability,compressive strength and shrinkage were studied and compared through experiment. Finally,the flexural and shear beams were designed and the static tests were conducted to compare the cracking load,deflection curve and ultimate strength of the beams made with different kinds of sand aggregates. The results show that the shape parameters of ellipse ratio and circularity can be used to separate different kinds of aggregates. The strength and longterm dry shrinkage performance of manufactured sand concrete with reasonable gradation and shape parameter can reach or even exceed that of concrete made with natural sand. The failure patterns of the beams made of manufactured sands and natural sands are very similar for both flexural and shear failure mechanism. The bearing capacity of the beams made with manufactured sands exhibits a positive correlation with the concrete strength. The current concrete design method can well meet the engineering requirement. However,the concrete made with natural sand has a higher cracking load than the concrete made with manufactured sand. The current calculation method overestimates the cracking load of the concrete beam made with manufactured sand. Therefore,the cracking load of reinforced concrete beam made with manufactured sand obtained by current calculation method needs to be adjusted accordingly.
In order to explain the macro flexural behavior and shear behavior of concrete beams made with manufactured sand from the meso-index of manufactured sands,natural sand and three kinds of manufactured sands were selected in this research. The material indexes of gradation,fineness modulus,powder content,MB value and so on were compared. The digital image process method was used to obtain the shape parameters of different aggregates.The concrete workability,compressive strength and shrinkage were studied and compared through experiment. Finally,the flexural and shear beams were designed and the static tests were conducted to compare the cracking load,deflection curve and ultimate strength of the beams made with different kinds of sand aggregates. The results show that the shape parameters of ellipse ratio and circularity can be used to separate different kinds of aggregates. The strength and longterm dry shrinkage performance of manufactured sand concrete with reasonable gradation and shape parameter can reach or even exceed that of concrete made with natural sand. The failure patterns of the beams made of manufactured sands and natural sands are very similar for both flexural and shear failure mechanism. The bearing capacity of the beams made with manufactured sands exhibits a positive correlation with the concrete strength. The current concrete design method can well meet the engineering requirement. However,the concrete made with natural sand has a higher cracking load than the concrete made with manufactured sand. The current calculation method overestimates the cracking load of the concrete beam made with manufactured sand. Therefore,the cracking load of reinforced concrete beam made with manufactured sand obtained by current calculation method needs to be adjusted accordingly.
引文
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[17]廖建东.机制砂在某高速铁路高性能混凝土中的应用[J].路基工程,2013(4):176-178.(LIAOJiandong.Application of high performance concrete with machine-made sand in express railway engineering[J].Subgrade Engineering,2013(4):176-178.(in Chinese))
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[19]RAJU N,KISHORE R,BHIKSHMA V.Flexural behavior of high strength stone dust concrete[C]//5th International Structural Engineering and Construction Conference.Las Vegas,USA:Taylor&Francis Group,2010.
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[22]赵顺波,丁新新,李长明,等.变形钢筋与机制砂混凝土黏结性能试验研究[J].建筑材料学报,2013,16(2):191-196.(ZHAO Shunbo,DING Xinxin,LIChangming,et al.Experimental study of bond properties between deformed steel bar and concrete with machine-made sand[J].Journal of Building Materials,2013,16(2):191-196.(in Chinese))
[23]ZHAO Shunbo,DING Xinxin,ZHAO Mingshuang,et al.Experimental study on tensile strength development of concrete with manufactured sand[J].Construction and Building Materials,2017,138:247-253.
[24]李凤兰,毋欢欢,苏延峰,等.机制砂再生粗骨料混凝土配筋柱大偏心受压裂缝控制试验研究[J].华北水利水电大学学报(自然科学版),2015,36(6):27-31.(LI Fenglan,WU Huanhuan,SU Yanfeng,et al.Experimental study and calculation of large eccentric compression crack control for reinforced manufactured sand and recycled coarse aggregate concrete columns[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2015,36(6):27-31.(in Chinese))
[25]SHASHIDHAR Naga,GOPALAKRISHNANKasthurirangan.Evaluating the aggregate structure in hot-mix asphalt using three-dimensional computer modeling and particle packing simulations[J].Canadian Journal of Civil Engineering,2006,33(8):945-954.
[26]International Organization for Standardization.Representation of results of particle size analysis:part6:descriptive and quantitative representation of particle shape and morphology:ISO 9276-6:2008[S].Vernier,Geneva,Switzerland:International Organization for Standardization,2008.
[27]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:464.(GUO Zhenhai,SHIXudong.Reinforced concrete theory and analyses[M].Beijing:Tsinghua University Press,2003:464.(in Chinese))
[2]DILEK Ufuk.Effects of manufactured sand characteristics on water demand of mortar and concrete mixtures[J].Journal of Testing and Evaluation,2015,43(3):562-573.
[3]TIAN Zhenghong,BU Jingwu.Investigation of pore structure for manufactured sand mortar[J].Applied Mechanics and Materials,2014,534:39-51.
[4]蒋正武,梅世龙.机制砂高性能混凝土[M].北京:化学工业出版社,2015:363.(JIANG Zhengwu,MEIShilong.High performance concrete with manufactured sand[M].Beijing:Chemical Industry Press,2015:363.(in Chinese))
[5]DU Bin,XIANG Tianyu,HUANG Zhihong.Research on creep application of high-strength concrete with manufactured sand for bridge use[J].Agro Food Industry Hi-Tech,2017,28(1):3064-3067.
[6]TIAN Zhenghong,BU Jingwu.Mathematical model relating uniaxial compressive behavior of manufactured sand mortar to MIP-Derived pore structure parameters[J].Scientific World Journal,2014,14(7):1-9.
[7]LI Beixing,KE Guoju,ZHOU Mingkai.Influence of manufactured sand characteristics on strength and abrasion resistance of pavement cement concrete[J].Construction and Building Materials,2011,25(10):3849-3853.
[8]SHEN Weiguo,LIU Yi,CAO Lianghong,et al.Mixing design and microstructure of ultra high strength concrete with manufactured sand[J].Construction and Building Materials,2017,143:312-321.
[9]DING Xinxin,LI Changyong,XU Yangyang,et al.Experimental study on long-term compressive strength of concrete with manufactured sand[J].Construction and Building Materials,2016,108:67-73.
[10]LI Beixing,WANG Jiliang,ZHOU Mingkai.Effect of limestone fines content in manufactured sand on durability of low-and high-strength concretes[J].Construction and Building Materials,2009,23(8):2846-2850.
[11]LI Huajian,HUANG Fali,CHENG Guanzhi,et al.Effect of granite dust on mechanical and some durability properties of manufactured sand concrete[J].Construction and Building Materials,2016,109:41-46.
[12]CHEN Zhengfa,PENG Gaojv,LIU Guifeng,et al.Influence of water cement ratio on the mechanical property of manufactured sand concrete in severe environment[J].Oxidation Communications,2016,39(2):1452-1461.
[13]潘丽云,李凤兰,刘春杰.机制砂混凝土概论[M].北京:中国水利水电出版社,2014:190.(PANLiyun,LI Fenglan,LIU Chunjie.Machine-made sand concrete[M].Beijing:China Water&Power Press,2014:190.(in Chinese))
[14]JI Tao,CHEN Caiyi,ZHUANG Yizhou,et al.A mix proportion design method of manufactured sand concrete based on minimum paste theory[J].Construction and Building Materials,2013,44:422-426.
[15]ZAITRI R,BEDERINA M,BOUZIANI T,et al.Development of high performances concrete based on the addition of grinded dune sand and limestone rock using themixture design modelling approach[J].Construction and Building Materials,2014,60:8-16.
[16]尹明.高性能机制砂混凝土在高速公路中的应用[J].公路工程,2014,39(1):180-183.(YINMing.Application of high performance concrete with manufactured sand in the highway[J].Highway Engineering,2014,39(1):180-183.(in Chinese))
[17]廖建东.机制砂在某高速铁路高性能混凝土中的应用[J].路基工程,2013(4):176-178.(LIAOJiandong.Application of high performance concrete with machine-made sand in express railway engineering[J].Subgrade Engineering,2013(4):176-178.(in Chinese))
[18]PRAKASH RAO D S,KUMAR V G.Investigations on concrete with stone crusher dust as fine aggregate[J].India Concrete Journal,2004,78(7):45-50.
[19]RAJU N,KISHORE R,BHIKSHMA V.Flexural behavior of high strength stone dust concrete[C]//5th International Structural Engineering and Construction Conference.Las Vegas,USA:Taylor&Francis Group,2010.
[20]李艳芳,刘战鳌,周明凯.机制砂混凝土在C50预制T梁中的应用研究[J].交通科技,2012(5):90-92.(LI Yanfang,LIU Zhan’ao,ZHOU Mingkai.Study on the applicantion of manufactured-sand concrete in precast C50 T beam[J].Transportation Science&Technology,2012(5):90-92.(in Chinese))
[21]王稷良,喻世涛,刘俊,等.C50 T型梁机制砂混凝土的配制与应用研究[J].公路,2007(1):157-160.(WANG Jiliang,YU Shitao,LIU Jun,et al.Research on preparation and application of C50 T-type girder manufactured-sand concrete[J].Highway,2007(1):157-160.(in Chinese))
[22]赵顺波,丁新新,李长明,等.变形钢筋与机制砂混凝土黏结性能试验研究[J].建筑材料学报,2013,16(2):191-196.(ZHAO Shunbo,DING Xinxin,LIChangming,et al.Experimental study of bond properties between deformed steel bar and concrete with machine-made sand[J].Journal of Building Materials,2013,16(2):191-196.(in Chinese))
[23]ZHAO Shunbo,DING Xinxin,ZHAO Mingshuang,et al.Experimental study on tensile strength development of concrete with manufactured sand[J].Construction and Building Materials,2017,138:247-253.
[24]李凤兰,毋欢欢,苏延峰,等.机制砂再生粗骨料混凝土配筋柱大偏心受压裂缝控制试验研究[J].华北水利水电大学学报(自然科学版),2015,36(6):27-31.(LI Fenglan,WU Huanhuan,SU Yanfeng,et al.Experimental study and calculation of large eccentric compression crack control for reinforced manufactured sand and recycled coarse aggregate concrete columns[J].Journal of North China University of Water Resources and Electric Power(Natural Science Edition),2015,36(6):27-31.(in Chinese))
[25]SHASHIDHAR Naga,GOPALAKRISHNANKasthurirangan.Evaluating the aggregate structure in hot-mix asphalt using three-dimensional computer modeling and particle packing simulations[J].Canadian Journal of Civil Engineering,2006,33(8):945-954.
[26]International Organization for Standardization.Representation of results of particle size analysis:part6:descriptive and quantitative representation of particle shape and morphology:ISO 9276-6:2008[S].Vernier,Geneva,Switzerland:International Organization for Standardization,2008.
[27]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:464.(GUO Zhenhai,SHIXudong.Reinforced concrete theory and analyses[M].Beijing:Tsinghua University Press,2003:464.(in Chinese))
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