| 钢纤维混凝土的发展现状分 |
| 添加时间：2017/5/22 11:53:53 浏览次数： |
| 钢纤维混凝土的发展现状分析 The development of steel fiber concrete is analyzed 1. 钢纤维混凝土。钢纤维混凝土是在普通混凝土中掺入少量低碳钢、不锈钢和玻璃钢的纤维后形成的一种比较均匀而多向配筋的混凝土。钢纤维的掺入量按体积一般为1%~2%，而按重量计每立方米混凝土中掺70~100kg钢纤维，钢纤维的长度宜为25~60mm，直径为0.25~1.25mm，长度与直径的最佳比值为50~700。与普通混凝土相比，它不仅能改善抗拉、抗剪、抗弯、抗磨和抗裂性能，而且能大大增强混凝土的断裂韧性和抗冲击性能，显著提高结构的抗疲劳性能及其耐久性，尤其是韧性可增加10~20倍。我国对钢纤维混凝土与普通混凝土力学性能做了比较试验，当钢纤维掺入量为15%~20%、水灰比为0.45时，其抗拉强度增长50%~70%，抗弯强度增长120%~180%，抗冲击强度增长10~20倍，抗冲击疲劳强度增长15~20倍，抗弯韧性增长14~20倍，耐磨损性能也明显改善。因此，钢纤维混凝土比素混凝土具有更优越的物理和力学性能。 Steel fiber concrete. Steel fiber reinforced concrete is in the ordinary concrete added a small amount of low carbon steel, stainless steel and glass fiber reinforced plastic fiber after the formation of a more uniform and multidirectional reinforcement of concrete. Steel fiber mortar is commonly 1% ~ 2% by volume, and weight meter per cubic meter of 70 ~ 100 kg of steel fiber in concrete, steel fiber length appropriate for 25 ~ 60 mm, 0.25 ~ 1.25 mm diameter, length and the diameter of the best ratio of 50 ~ 700. Compared with ordinary concrete, it can not only improve the tensile, shear, bending, anti-wear and crack resistance, and can greatly enhance the fracture toughness and impact resistance of concrete, significantly improve the anti-fatigue performance and durability of the structure, especially the toughness increases 10 to 20 times. Mechanical properties of steel fiber reinforced concrete and ordinary concrete in our country do the comparison test, when steel fiber mixed with 15% ~ 15%, water cement ratio of 0.45, the tensile strength increased by 50% ~ 70%, the flexural strength increased by 120% ~ 120%, the impact strength increased 10 ~ 20 times, the impact fatigue strength increase 15 ~ 20 times, flexural toughness increase 14 ~ 20 times, wear-resisting performance is obviously improved. Therefore, steel fiber reinforced concrete has superior physical and mechanical properties. |
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