机制砂混凝土梁受弯性能试验研究与分析
引用文献：
柏美岩 吴宇清 肖建庄 谢开仲. 机制砂混凝土梁受弯性能试验研究与分析[J]. 建筑结构，2023，48（12）：74-79.
BAI Meiyan WU Yuching XIAO Jianzhuang XIE Kaizhong. Experimental study and analysis on flexural behavior of concrete beams with manufactured sand[J]. Building Structure，2023,48（12）：74-79.
摘要：石粉含量对机制砂混凝土的性能有较大的影响。对不同石粉含量的机制砂混凝土梁开展受弯试验，对比研究了不同石粉含量机制砂混凝土梁和天然砂混凝土梁受弯破坏形式、极限荷载、钢筋和混凝土应变以及梁跨中挠度等。结果表明，机制砂混凝土的抗压强度和弹性模量随石粉含量的增加先增大再减小，当石粉含量范围在5%～15%时，机制砂混凝土的抗压强度和弹性模量优于天然砂混凝土。与天然砂混凝土梁相比，石粉含量为5%和10%的机制砂混凝土梁受弯极限承载力分别提高了50%和52%,开裂荷载分别增加了70%和75%,当石粉含量为10%时，试验梁极限荷载最大。合适的石粉含量对机制砂混凝土梁受弯性能的提升有较好的促进作用，建议石粉含量取为5%～10%。
关键词：机制砂；石粉；混凝土梁；受弯性能；破坏模式；
基金：国家自然科学基金项目(51868007，51368005)。
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[13] SHEN W G,YANG Z G,CAO L H,et al.Characterization of manufactured sand:particle shape,surface texture and behavior in concrete[J].Construction and Building Materials,2016,114:595-601.
[14] 柯晓军，叶春颖，陈世杰，等.石粉含量及机制砂取代率对再生粗骨料混凝土流动性和抗压强度的影响[J].混凝土，2020(6):106-108,112.
[15] PRAKASH R D S,KUMAR V G.Investigations on concrete with stone crusher dust as fine aggregate[J].The Indian Concrete Journal,2004,78(7):45-50.
[16] 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):191-196,202.
[17] ZHAO S B,DING X X,ZHAO M S,et al.Experimental study on tensile strength development of concrete with manufactured sand[J].Construction and Building Materials,2017,138:247-253.
[18] 建设用砂：GB/T 14684—2011[S].北京：中国标准出版社，2011.
[19] 普通混凝土力学性能试验方法：GB/T 50081—2002 [S].北京：中国建筑工业出版社，2002.
[20] 混凝土结构试验方法标准：GB/T 50152—2012 [S].北京：中国建筑工业出版社，2012.
[2] SHEN W G,YANG Z G,CAO L H .Characterization of manufactured sand:particle shape,surface texture and behavior in concrete[J].Construction and Building Materials,2016,114:595-601.
[3] WESTERHOLM M,LAGERBLAD B,SILFWERBRAND J,et al.Influence of fine aggregate characteristics on the rheological properties of mortars[J].Cement and Concrete Composites,2008,30(4):274-282.
[4] MALHORTRA V M,CARETTE G G.Performance of concrete incorporating limestone dust as partial replacement for sand[J].Journal of the American Concrete Institute,1985,82(3):363.
[5] ZHONG C L,LIU M,ZHANG Y L,et al.Study on mix proportion optimization of manufactured sand RPC and design method of steel fiber content under different curing methods[J].Materials (Basel),2019,12(11):1845.
[6] LI B X,KE G J,ZHOU M K.Influence of manufactured sand characteristics on strength and abrasion resistance of pavement cement concrete[J].Construction and Building Materials,2011,25(10):3849-3853.
[7] 申爱琴，张敬，樊莉，等.高寒山区C40机制砂混凝土耐久性能[J].江苏大学学报(自然科学版),2018,39(1):115-119.
[8] ZHAO S B,LI Y T,XU Y Y.Study on durability of concrete with machine-made sand part II:long-term carbonization[J].Applied Mechanics and Materials,2013,438/439:10-14.
[9] XIE K Z,BAI M Y,QING Z G,et al.Study on durability of manufactured sand based on stone powder content[J].Science of Advanced Materials,2018,10(11):1608-1614.
[10] ÇELIK T,MARAR K.Effects of crushed stone dust on some properties of concrete[J].Cement and Concrete Research,1996,26(7):1121-1130.
[11] JADHAV P A,KULKARNI D K .An experimental investigation on the properties of concrete containing manufactured sand[J].International Journal of Advanced Engineering Technology,2012,3 (2),101-104.
[12] PILEGIS M,GARDNER D,LARK R.An investigation into the use of manufactured sand as a 100% replacement for fine aggregate in concrete[J].Materials (Basel),2016,9(6):440.
[13] SHEN W G,YANG Z G,CAO L H,et al.Characterization of manufactured sand:particle shape,surface texture and behavior in concrete[J].Construction and Building Materials,2016,114:595-601.
[14] 柯晓军，叶春颖，陈世杰，等.石粉含量及机制砂取代率对再生粗骨料混凝土流动性和抗压强度的影响[J].混凝土，2020(6):106-108,112.
[15] PRAKASH R D S,KUMAR V G.Investigations on concrete with stone crusher dust as fine aggregate[J].The Indian Concrete Journal,2004,78(7):45-50.
[16] 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):191-196,202.
[17] ZHAO S B,DING X X,ZHAO M S,et al.Experimental study on tensile strength development of concrete with manufactured sand[J].Construction and Building Materials,2017,138:247-253.
[18] 建设用砂：GB/T 14684—2011[S].北京：中国标准出版社，2011.
[19] 普通混凝土力学性能试验方法：GB/T 50081—2002 [S].北京：中国建筑工业出版社，2002.
[20] 混凝土结构试验方法标准：GB/T 50152—2012 [S].北京：中国建筑工业出版社，2012.
Experimental study and analysis on flexural behavior of concrete beams with manufactured sand
Abstract: The stone powder content has a great influence on the performance of manufactured sand concrete. The bending tests of manufactured sand concrete beams with different stone powder content were carried out, the bending failure forms of manufactured sand concrete beams with different stone powder content and natural sand concrete beams, the ultimate load, strain and deflection of reinforcement and concrete, and mid span deflection were studied. The results show that the compressive strength and elastic modulus of manufactured sand concrete first increase and then decrease with the increase of stone powder content. When the stone powder content ranges from 5% to 15%, the compressive strength and elastic modulus of manufactured sand concrete are better than natural sand concrete. Compared with natural sand concrete beams, the ultimate bearing capacity of manufactured sand concrete beams with stone powder content of 5% and 10% is increased by 50% and 52% respectively, and the cracking load is increased by 70% and 75% respectively. When the stone powder content is 10%, the ultimate load of the test beam is the largest. The appropriate content of stone powder can promote the improvement of flexural performance of manufactured sand concrete beams, and it is suggested that the content of stone powder should be 5% to 10%.
Keywords: manufactured sand; stone powder; concrete beam; flexural performance; failure mode
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