聚丙烯纤维增强水泥基复合材料界面过渡区的纳米力学性能-硅酸盐学报.PDF

第 44 卷第 2 期 硅 酸 盐 学 报 Vol. 44 ，No. 2 2 0 1 6 年 2 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY February ，2016 DOI ：10.14062/j.issn.0454-5648.2016.02.13 聚丙烯纤维增强水泥基复合材料界面过渡区的纳米力学性能 胡 杰，徐礼华，邓方茜，池 寅，刘素梅 (武汉大学土木建筑工程学院，武汉 430072) 摘 要：研究了不同水灰比条件下聚丙烯纤维增强水泥基复合材料界面过渡区(ITZ)的纳米力学性能。通过纳米压痕试验测试 界面过渡区及其附近区域的载荷–深度(P–h) 曲线，运用Oliver-Pharr 方法得到各测点弹性模量和压痕硬度，采用高倍显微镜成 像与扫描电子显微镜技术绘制了界面过渡区微结构表征云图。利用反褶积法对水泥基体及界面过渡区的弹性模量及压痕硬度 进行多峰拟合，得到了各相的频率分布。结果表明：不同水灰比条件下界面过渡区的厚度均处于 10~20 μm 之间，且其弹性 模量和压痕硬度均低于水泥基体的；随着水灰比的变化，界面过渡区水化产物的成分及体积分数也产生相应改变。 关键词：聚丙烯纤维；水泥基复合材料；纳米压痕技术；界面过渡区；物相；微观力学性能 中图分类号：TU525.9 文献标志码：A 文章编号：0454–5648(2016)02–0268–11 网络出版时间：2016–01–25 12:48:49 网络出版地址：/kcms/detail/11.2310.TQ1248.017.html Nanoscale Mechanical Properties of Interfacial Transition Zone between Polypropylene Fiber and Cement Matrix HU Jie, XU Lihua , DENG Fangqian , CHI Yin, LIU Sumei (School of Civil Engineering, Wuhan University, Wuhan 430072, China) Abstract: The nanoscale mechanical properties of interfacial transition zone (ITZ) in polypropylene fiber reinforced cementitious composite for different water/cement ratios were investigated. The load–depth(P–h) curves of ITZ were determined via nanoindentation test. The corresponding elastic modulus and hardness were calculated by the Oliver-Pharr method. The microstructure nephograms were obtained by high–resolution microscopy and scanning electron microscopy. Furthermore, the frequency distribution of different phases in ITZ and cement was determined by a multi-peak fitting deconvolution method. The results indicate that the ITZs width ranged from 10 μm to 20 μm appears in all the ca