钢纤维是由****硬拉钢丝制成,“粘结成排”的钢纤维能够保证更加简单、快速、均匀的混合,而两端的弯钩形状加强与混凝土的握裹力;对裂缝控制,提高工程效能有很好的效果;抵抗大幅度温度变化带来的混凝土剥落方面具有很好的效果。与普通混凝土相比,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,显著提高结构的疲劳性能及其耐久性。尤其是韧性可增加l0-20倍。
Steel fibers are made of * * * * hard drawn steel wires, and the "bonded into rows" of steel fibers can ensure simpler, faster, and more uniform mixing. The shape of the hooks at both ends enhances the gripping force with concrete; It has a good effect on crack control and improving engineering efficiency; It has a good effect in resisting concrete spalling caused by significant temperature changes. Compared with ordinary concrete, it can not only improve the tensile, shear, bending, wear and crack resistance, but also greatly enhance the fracture toughness and impact resistance of concrete, significantly improving the fatigue performance and durability of the structure. Especially, toughness can increase by 10-20 times.
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l-2%,而按重量计每立方米混凝土中掺70-100Kg左右钢纤维,钢纤维的长度宜为25-60mm,直径为0.25-1.25mm,长度与直径的****比值为50-700。钢纤维与普通混凝土相比,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,显著提高结构的疲劳性能及其耐久性。尤其是韧性可增加l0-20倍。
Steel fiber reinforced concrete is a relatively uniform and multi-directional reinforced concrete formed by adding a small amount of fibers from low-carbon steel, stainless steel, and fiberglass to ordinary concrete. The amount of steel fiber added is generally 1-2% by volume, and about 70-100Kg of steel fiber is added per cubic meter of concrete by weight. The length of steel fiber should be 25-60mm, with a diameter of 0.25-1.25mm and a * * * * ratio of length to diameter of 50-700. Compared with ordinary concrete, steel fibers can not only improve the tensile, shear, bending, wear and crack resistance, but also greatly enhance the fracture toughness and impact resistance of concrete, significantly improving the fatigue performance and durability of structures. Especially, toughness can increase by 10-20 times.
国内外对钢纤维的作用机理和钢纤维混凝土的基本性能做了大量研究,现归纳如下:1.强度和重量比值增大。这是钢纤维混凝土具有****经济性的重要标志。2.具有较高的抗拉、抗弯、抗剪和抗扭强度。在混凝土中掺入适量钢纤维,其抗拉强度提高25%——50%,抗弯强度提高40%——80%,抗剪强度提高50%——100%
A large amount of research has been conducted both domestically and internationally on the mechanism of action of steel fibers and the basic properties of steel fiber reinforced concrete, which can be summarized as follows: 1. The ratio of strength to weight increases. This is an important symbol of the economic viability of steel fiber reinforced concrete. 2. It has high tensile, bending, shear, and torsional strength. Adding an appropriate amount of steel fibers to concrete can increase its tensile strength by 25-50%, flexural strength by 40-80%, and shear strength by 50-100%