钢纤维-水泥基界面过渡区纳米力学性能-中国建筑材料联合会.pdf

第44 卷第8 期 硅 酸 盐 学 报 Vol. 44 ，No. 8 2 0 1 6 年 8 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY August ，2016 DOI ：10.14062/j.issn.0454-5648.2016.08.09 钢纤维-水泥基界面过渡区纳米力学性能 徐礼华，余红芸，池 寅，邓方茜，胡 杰 (武汉大学土木建筑工程学院，武汉 430072) 摘 要：研究不同水灰比条件下的钢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荷载–压痕深度曲线，运用Oliver-Pharr 方法研究了弹性模量和硬度分布规律并绘制相应的微结构表 征云图，结合扫描电子显微镜分析ITZ 形成机制。此外，利用反褶积法对ITZ 的弹性模量及压痕硬度的频率分布曲线进行多 峰拟合，得到了各相的频率分布。结果表明：不同水灰比样品界面过渡区的厚度均为40 μm 左右；在界面过渡区内，弹性模 量和压痕硬度的最弱点在距纤维表面20 μm 附近，且水灰比越大，弹性模量与压痕硬度值越小；随着水灰比的增大，界面过 渡区孔洞和低密度水化硅酸钙含量逐渐增高，高密度水化硅酸钙含量逐渐降低。 关键词：纳米力学性能；扫描电子显微镜；界面过渡区；微观结构 中图分类号：TU525.9 文献标志码：A 文章编号：0454–5648(2016)08–1134–13 网络出版时间：2016–07–22 09:02:05 网络出版地址：/kcms/detail/11.2310.TQ2102.009.html Nano-indentation Character of Interfacial Transition Zone Between Steel Fiber and Cement Paste XU Lihua , YU Hongyun, CHI Yin, DENG Fangqian , HU Jie (School of Civil Engineering, Wuhan University, Wuhan 430072, China) Abstract: The nanoscale mechanical properties of interfacial transition zone (ITZ) in steel fiber reinforced cementitious composite for different water-cement ratios were investigated. The load-crack depth (P-h) curves of ITZ were determined via nanoindentation test. The distribution of elastic modulus and hardness were calculated and mapped in a 2D plane by the Oliver-Pharr method. The formation mechanism of ITZ was analyzed. In addition, the frequency distribution of different phases in ITZ was determined by a multi-peak fitting deconvolution method. The results indicate that there is a interface width about 40 μm in all the cases. T