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首页> 外文期刊>Cement & concrete composites >Effect of shrinkage reducing agent on pullout resistance of high-strength steel fibers embedded in ultra-high-performance concrete
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Effect of shrinkage reducing agent on pullout resistance of high-strength steel fibers embedded in ultra-high-performance concrete

机译：收缩减少剂对超高性能混凝土嵌入式高强度钢纤维拉伸电阻的影响

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摘要

The interfacial bond strength of long high-strength steel fibers embedded in ultra-high-performance concrete (UHPC) reinforced with short steel microfibers was investigated by conducting single-fiber pullout tests. In particular, the influence of the addition of a shrinkage-reducing to a UHPC matrix on the pullout resistance of high-strength steel fibers was investigated. The addition of a shrinkage-reducing agent produced a noticeable reduction in the fiber pullout resistance owing to the lower matrix shrinkage, although the reduction of pullout resistance differed according to the type of fiber. Long smooth and twisted steel fibers were highly sensitive to the addition of the shrinkage-reducing agent whereas hooked fibers were not. Among the various high-strength steel fibers tested, twisted steel macrofibers showed the highest interfacial bond resistance, although twisted fibers embedded in UHPC showed slip softening pullout behavior rather than the typical slip hardening behavior observed in mortar.
机译：通过进行单纤维拉出试验研究了用短钢微纤维嵌入超高性能混凝土（UHPC）中嵌入的长高度高度钢纤维的界面粘结强度。特别地，研究了在高强度钢纤维的拉伸电阻上加入收缩降低到UHPC基质的影响。由于较低的矩阵收缩，添加收缩降低剂的加入减少了纤维拉伸电阻的显着降低，尽管根据纤维类型的拉伸电阻的降低不同。长光滑和扭曲的钢纤维对添加收缩降低剂的高度敏感，而钩状纤维不是。在经过测试的各种高强度钢纤维中，扭钢大纤维显示出最高的界面粘合性，尽管嵌入在UHPC中的扭曲纤维显示出滑动软化的拉出行为，而不是在砂浆中观察到的典型滑动硬化行为。

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