粉煤灰综合利用
FLYASHCOMPREHENSIVEUTILIZATION
2018NO.4 试验与应用
PVA纤维对水泥基复合材料流动性能及力学性能的影响
Effect of PVA Fibers on the Flow and Mechanical Properties of Cementbased Composites
般康蜓，孙海燕，龚爱民，赵定柱（云南农业大学水利水电学院，昆明650201）
摘要：研究三种长径比及三种不同体积掺量的PVA纤维对水泥基复合材料流动性能和力学性能的影响。结果表明：随纤维体积掺量的增加，各组胶砂拌合物的调桌流动度数值均呈现出逐渐下降的变化趋势，在相同体积掺量下，直径31μm、长度6mm的纤维对拌合物流动性影响更显著一些；为使得胶砂拌合物具有较好的工作性，可振搞成型密实，将PVA纤维体积掺量控制在0.4%以内作为适宜的纤维体积掺量范围：随龄期的增长，三种规格纤维对水泥基复合材料的抗折强度、抗压强度均随纤维体积掺量的增加面增加，且PVA纤维对水泥基复合材料抗折强度的影响较其抗压强度显著，直径40μm、长度12mm的纤维较其他两种规格的纤维不仅能显著改善水泥基复合材料的早期强度，且对其后期强度的发展也很有利。
关键调：PVA纤维；长径比：体积掺量；调桌流动度：抗折强度
中图分类号：TV431*.3
文献标识码：A
文章编号：10058249（2018）04-0019-04
Yin Kangting, Sun Haiyan, Gong Aimin, Zhao Dingzhu
(School of water conservancy and HydropowerEngineering,Yunnan Agricultural University,Kunming,650201)
Abstract: The effects of three kinds of PVA fibers with long diameter ratio and three different volume contents on the flow and mechanical properties of cementbased composites were studied. The results show that with the increase of the volume of fiber volume, the flow degree of the mixing table in each group shows a gradual decreasing trend. Under the same volume, the fiber with the diameter of 31 m and the length Gmm has a more significant effect on the dynamic mixing of the mixing material. The bulk density of the PVA fiber is controlled within O.4 % as the suitable volume range of fiber volume. As the age increases, the flexural strength and compressive strength of the three kinds of fiber reinforced cement composites are inereased with the increase of the volume of fiber volume, and the effect of the PVA fiber on the flexural strength of the cement based composite is more than that of the cement matrix composites, The compressive strength was 40 m diameter, 12 mm length of the fiber than the other two kinds of fiber can not only improve the early strength of cement based composite materials, and the development of the late strength is also beneficial.
Keywords: PVA fiber; aspeet ratio; volume content; flow rate of adjusting table; flexural strength
混凝土等传统水泥基建筑材料是脆性材料，抗拉强度低、抗裂性差和脆性大的缺点严重影响水泥基金项目：云南农业大学自然科学青年科研基金项目（项目编号2016ZR15），云南农业大学科技创新创业行动基金项目（项目编号2018ZKY149）
作者简介：股康辑（1995～），女，在读研究生，主要从事水工材料研究。Email：1175824762@qq.com
通讯作者：孙海燕（1979-），女，副教授，硕士生导师，主要从事新材料的研究。E-mail：shy0474@163.com
收稿日期：2018-06-10 万方数据
基材料的发展。为克服该缺陷，近年来逐渐发展起来一种基于细观力学设计、微观物理力学原理设计的乱向分布短纤维增强水泥基复合材料，国外将其称为工程水泥基复合材料（ECC)，其超强的韧性、应变硬化特性、多缝开裂特性等优越的性能被认为是一种极有应用前景的建筑复合材料（1]，该材料受拉承载力可继续增长，从而可使材料伴随着多缝开裂出现应变硬化现象[2]。吴宗伟院士认为纤维是增强水泥基复合材料性能的重要材料【3]，纤维加人到水泥基材料中可使材料的抗拉，抗弯等性能得以改善。
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