PVA纤维对再生透水混凝土的性能影响研究
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摘要
以两种粒径(9.5~16.0 mm和4.75~9.5 mm)再生粗骨料掺比1∶1为基准,比较了干法和湿法两种掺加方式对PVA纤维分散性的影响。通过设计正交试验研究了纤维的掺加量、长度和分散剂对其在透水混凝土中的分散性及透水混凝土性能的影响规律。结果表明:PVA纤维掺加量和长度对分散效果影响显著,对力学性能改善较为明显,纤维掺加量为0.1%(体积分数),长度为6 mm时,抗压和劈裂抗拉强度分别达到9.01 MPa和1.91 MPa。此外,3个因素对透水系数影响均不明显。
Based on the ratio of 1:1 by two kinds of particle size with 9.5-16 mm and 4.75-9.5 mm of recycled coarse aggregates, the influences on dispersion of PVA fibers were studied by comparing dry adding method with wet adding method. Then, the effects of volume fraction and length of fibers, dispersing agent on dispersion of fibers and properties of recycled aggregate pervious concrete(RPC) were studied by orthogonal testing method. The results show that the volume fraction and length of PVA fibers have significant effects on the dispersion of fibers and the mechanical properties of RPC are obviously improved, when the volume fraction is 0.1% and the length is 6 mm, the compressive strength and splitting tensile strength of RPC can respectively reach 9.01 MPa and 1.91 MPa. In addition, three factors, including volume fraction and length of fibers, dispersing agent have few effects on permeability coefficient of RPC.
Based on the ratio of 1:1 by two kinds of particle size with 9.5-16 mm and 4.75-9.5 mm of recycled coarse aggregates, the influences on dispersion of PVA fibers were studied by comparing dry adding method with wet adding method. Then, the effects of volume fraction and length of fibers, dispersing agent on dispersion of fibers and properties of recycled aggregate pervious concrete(RPC) were studied by orthogonal testing method. The results show that the volume fraction and length of PVA fibers have significant effects on the dispersion of fibers and the mechanical properties of RPC are obviously improved, when the volume fraction is 0.1% and the length is 6 mm, the compressive strength and splitting tensile strength of RPC can respectively reach 9.01 MPa and 1.91 MPa. In addition, three factors, including volume fraction and length of fibers, dispersing agent have few effects on permeability coefficient of RPC.
引文
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[2]吴中伟.纤维增强-水泥基材料的未来[J].混凝土与水泥制品,1999(1):5-6.
[3]陈守开,刘新飞,郭磊,等.再生骨料掺配比对再生透水混凝土性能的影响[J].复合材料学报,2018, 35(6):1591-1598.
[4]刘建忠,张丽辉,李长风,等.聚乙烯醇纤维在水泥基复合材料中的分散性表征及调控[J].硅酸盐学报,2015, 43(8):1063-1065.
[5]王丽丹,周志云,叶林飞,等.复合微粉和聚丙烯纤维对再生混凝土抗冻性研究[J].上海理工大学学报,2017, 39(3):304-305.
[6]李雪阳,江世永,飞渭,等.高韧性水泥基复合材料强度尺寸效应试验研究与正交分析[J].中国材料进展,2017, 36(6):474-477.
[7]陈爱玖,刘耀,王静,等.正交法分析透水混凝土的基本性能[J].混凝土,2010(9):40-41.
[8]刘建忠,张丽辉,李长风,等.聚乙烯醇纤维在水泥基复合材料中的分散性表征及调控[J].硅酸盐学报,2015, 43(8):1061-1062.
[9]刘肖凡,李继祥.刚性纤维增强透水混凝土配合比的试验研究[J].河北工业大学学报,2015, 44(6):105-107.
[10]宣卫红,赵晖,陈育志,等.聚丙烯纤维的长度对新拌砂浆工作性能的影响及机理分析[J].混凝土,2012(12):110-112.
[11]张炯,李莉,明瑞平,等.不同掺合料的透水混凝土冻融循环性能研究[J].硅酸盐通报,2017, 36(5):1484.