钢-聚丙烯混杂纤维再生混凝土弯曲韧性研究
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摘要
为了研究纤维对再生混凝土(RAC)的增韧效果,取体积掺量为0.5%、1.0%、1.5%的钢纤维和0.6%、0.9%、1.2%的聚丙烯纤维以单掺和混掺的方式掺入RAC中,采用四点弯曲试验对其弯曲性能进行研究,并分析了其微观增韧机理。结果表明:钢纤维和聚丙烯纤维的掺入对RAC弯曲破坏时承受的最大荷载、初裂挠度及韧性指数均有很大的改善,且混杂纤维改善效果优于单掺纤维。当钢纤维体积掺量为1.0%聚丙烯体积掺量为0.9%时,混杂纤维再生混凝土表现出良好的混杂效应,对弯曲性能的改善最为理想。
In order to study the toughening effect of fiber on recycled aggregate concrete( RAC),the steel fiber( SF) with volume fraction of 0. 5%,1. 0%,1. 5% and polypropylene fiber( PPF) with volume fraction of 0. 6%,0. 9% and 1. 2% were mixed into RAC by single-doped and blended. And the bending performance was analyzed by four point bending test. The micro toughening mechanism was also studied. Test results show that the maximum load,the initial cracking deflection and toughness indices of RAC are significantly improved by incorporated of fibers. And the improvement effect of hybrid fiber is better than that of single doped. The optimal fiber content is 1. 0% steel fiber and 0. 9% polypropylene fiber,which shows an most ideal flexural performance.
In order to study the toughening effect of fiber on recycled aggregate concrete( RAC),the steel fiber( SF) with volume fraction of 0. 5%,1. 0%,1. 5% and polypropylene fiber( PPF) with volume fraction of 0. 6%,0. 9% and 1. 2% were mixed into RAC by single-doped and blended. And the bending performance was analyzed by four point bending test. The micro toughening mechanism was also studied. Test results show that the maximum load,the initial cracking deflection and toughness indices of RAC are significantly improved by incorporated of fibers. And the improvement effect of hybrid fiber is better than that of single doped. The optimal fiber content is 1. 0% steel fiber and 0. 9% polypropylene fiber,which shows an most ideal flexural performance.
引文
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[24]江朝华,赵晖,张玮,等.玄武岩纤维对水泥砂浆性能及水泥石微观结构的影响[J].材料科学与工程学报,2008(5):765-769.
[2]肖建庄,李佳彬,兰阳.再生混凝土技术研究最新进展与评述[J].混凝土,2003(10):17-20.
[3]陈宗平,徐金俊,郑华海,等.再生混凝土基本力学性能试验及应力应变本构关系[J].建筑材料学报,2013,16(1):24-32.
[4]刘阳.再生混凝土梁受力性能的分析与研究[D].淮南:安徽理工大学,2015.
[5]章文姣,鲍成成,孔祥清,等.混杂纤维掺量对再生混凝土力学性能的影响研究[J].科学技术与工程,2016,16(13):106-112.
[6]高化东.混杂纤维再生混凝土力学性能及微观结构研究[D].锦州:辽宁工业大学,2018.
[7]姚琳,裴长春.混杂纤维再生混凝土基本力学性能试验研究[J].山西建筑,2016,42(35):117-119.
[8]Sorelli L G,Meda A,Plizzari G A.Bending and uniaxial tensile tests on concrete reinforced with hybrid steel fibers[J].Journal of Materials in Civil Engineering,2005,17(5):519-527.
[9]薛丹丹,裴长春.混杂纤维再生混凝土的力学及抗裂性能试验研究[J].山西建筑,2014(33):102-104.
[10]杜园芳,王社良,余滨杉,等.混杂再生纤维对再生混凝土强度的影响研究[J].工业建筑,2013,43(11):12-15.
[11]薛丹丹.钢-聚丙烯混杂纤维再生混凝土梁抗裂性能试验研究[D].延边朝鲜族自治州首府延吉市:延边大学,2015.
[12]贺晶晶,师俊平,王学志.纤维混杂效应对混凝土弯曲韧性的改善[J].实验力学,2017,32(1):113-122.
[13]刘慈,崔佳伟,邓佳卓,等.不同掺入率混杂钢纤维对再生混凝土性能的影响[J].混凝土与水泥制品,2016(12):53-56.
[14]Lee J H,Cho B,Choi E.Flexural capacity of fiber reinforced concrete with a consideration of concrete strength and fiber content[J].Construction&Building Materials,2017,138:222-231.
[15]Yoo D Y,Kim S W,Park J J.Comparative flexural behavior of ultra-high-performance concrete reinforced with hybrid straight steel fibers[J].Construction&Building Materials,2017,132:219-229.
[16]Li J J,Niu J G,Wan C J,et al.Investigation on mechanical properties and microstructure of high performance polypropylene fiber reinforced lightweight aggregate concrete[J].Construction&Building Materials,2016,118:27-35.
[17]王社良,鲁元龙,樊禹江.混杂纤维RAC框架节点的有限元分析[J].建筑科学与工程学报,2015,32(6):36-42.
[18]中国工程建设标准化协会.CECS13:2009.纤维混凝土试验方法标准[S].北京:中国计划出版社,2010:54-59.
[19]贾方方,贺奎,安明喆,等.粗合成纤维活性粉末混凝土抗弯韧性试验[J].建筑科学与工程学报,2014,31(3):79-84.
[20]尹机会.钢-合成纤维混凝土强度与韧性的试验研究[D].大连:大连理工大学,2006.
[21]ASTM C1399-98,Test method for obtaining average residual strength of fiber reinforced concrete[S].Annual Book of ASTM Standards,1998.
[22]邓宗才,师亚军,曹炜.聚烯烃粗合成纤维混凝土抗弯韧性试验[J].建筑科学与工程学报,2013,30(1):19-24.
[23]王成启,吴科如.不同几何尺寸纤维混杂混凝土的混杂效应[J].建筑材料学报,2005,8(3):250-255.
[24]江朝华,赵晖,张玮,等.玄武岩纤维对水泥砂浆性能及水泥石微观结构的影响[J].材料科学与工程学报,2008(5):765-769.