Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar
Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar
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DOI：
10.1016/j.cemconres.2009.05.002
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发表时间：
2009-08-01
影响因子：
11.4
通讯作者：
Lein, Hilde Lea
中科院分区：
文献类型：
--
作者：
Wang, Xiao Hui;Jacobsen, Stefan;Lein, Hilde Lea
采用纳米压痕和扫描电子显微镜研究了水胶比和硅灰掺量两组参数对钢纤维砂浆中钢纤维和纤维基质骨料界面区弹性模数和硬度分布的影响。讨论了界面过渡区中不同的界面结合条件。对于不含硅灰的试件，在低水胶比砂浆中，钢纤维与钢纤维和纤维-基质-骨料界面的粘结效果较好，而在高水胶比砂浆中，由于纤维下面不连续的渗漏空洞，纤维-基质粘结效果不是很好。另一方面，对于含有硅粉的试件，添加10%的硅粉后，钢纤维-基质界面上没有明显的弱117相，但由于钢纤维附近的空洞，硅灰对钢纤维-基质-骨料界面的影响不明显。(C)2009爱思唯尔有限公司。保留所有权利。
The characteristics of the profiles of elastic modulus and hardness of the steel fiber-matrix ana fiber-matrix-aggregate interfacial zones in steel fiber reinforced mortars have been investigated by using nanoindentation and Scanning Electron Microscopy (SEM), where two sets of parameters, i.e. water/binder ratio and content of silica fume were considered. Different interfacial bond conditions in the interfacial transition zones (ITZ) are discussed. For sample without silica fume, efficient interfacial bonds across the steel fiber-matrix and fiber-matrix-aggregate interfaces are shown in low water/binder ratio mortar; while in high water/binder ratio mortar, due to the discontinuous bleeding voids underneath the fiber, the fiber-matrix bond is not very good. On the other hand, for sample with silica fume, the addition of 10% silica fume leads to no distinct presence of weak 117 in the steel fiber-matrix interface; but the effect of the silica fume on the steel fiber-matrix-aggregate interfacial zone is not obvious due to voids in the vicinity of steel fiber. (C) 2009 Elsevier Ltd. All rights reserved.