Abstract This paper describes the steel fiber effect on the crack permeability and crack surface topography of concrete subjected to freeze-thaw damage. The sequential crack permeability of steel fiber reinforced concrete are investigated by a vacuum permeability set-up. The topographical analysis is applied on the crack surface by an invented 3-D laser scanning equipment. The results show that the crack permeability of concrete is less than the value predicted by the Poiseuille flow model and their difference decreases gradually with the crack widening. With increment of steel fiber dosage and freeze-thaw damage level, the effect of steel fiber on reducing the crack permeability becomes strong. Topographical analysis illustrates that both steel fiber and freeze-thaw damage enhance the roughness of concrete crack surface. The relationship between roughness number of crack surface and material permeability parameter α follows an exponential function, which can be employed to quickly estimate the crack permeability of concrete.

中文翻译：

---

钢纤维对冻融损伤混凝土裂纹渗透率演化及裂纹面形貌的影响

摘要 本文描述了钢纤维对冻融损伤混凝土裂缝渗透性和裂缝表面形貌的影响。通过真空渗透性装置研究了钢纤维混凝土的连续裂缝渗透性。通过发明的3-D激光扫描设备对裂纹表面进行地形分析。结果表明，混凝土裂缝渗透率小于泊肃叶流模型预测值，且随着裂缝的扩大，其差异逐渐减小。随着钢纤维用量和冻融损伤程度的增加，钢纤维降低裂纹渗透率的作用越来越强。地形分析表明，钢纤维和冻融损伤都增加了混凝土裂缝表面的粗糙度。