| 目前应用较多的钢纤维主要有以下几种 |
| 添加时间：2018/10/8 14:26:27 浏览次数： |
| (1) 钢丝切断制成的短纤维:该种纤维的制作工艺比较简单, 所得的钢纤维抗拉强度较高, 不足之处是其表面光滑, 因此与混凝土基体之间的粘结强度较低. (1) Short fibers made by cutting steel wires: This kind of fibers has a relatively simple manufacturing process, and the tensile strength of the steel fibers obtained is higher. The defect is that the surface of the steel fibers is smooth, so the bond strength between the steel fibers and the concrete matrix is lower. (2) 薄板剪切钢纤维:该种纤维的制作工艺与第一种相似, 原料是同所需纤维长度一样宽的薄钢板, 再经剪切制成, 在剪切中钢纤维稍带弯曲和扭曲, 这样能增加粘结强度. (2) Shearing steel fiber: This kind of fiber is similar to the first one. The raw material is the same as the required fiber length of thin steel plate, and then made by shearing, in shearing steel fiber slightly bending and twisting, which can increase the bonding strength. (3)钢锭铣削钢纤维:采用钢锭为原料, 用铣刀进行切削制成的纤维, 这种纤维的特点是轴向发生扭曲, 并用通过改进刀具可以使纤维表面产生粗糙面, 此外, 前两种纤维在生产过程中表面或多或少会粘有油污等杂质, 而该纤维的生产方法可确保其表面的洁净.因此用该方法制得的钢纤维与混凝土基体的粘结强度要高于前两种钢纤维. (3) Ingot milling of steel fibers: fibers made from ingots by milling with a milling cutter, characterized by axial distortion and rough surfaces on the surface of the fibers by means of improved cutting tools. In addition, the surface of the first two fibers may be more or less contaminated with impurities such as oil during production, and the production of the fibers Therefore, the bond strength between steel fiber and concrete matrix prepared by this method is higher than that of the first two steel fibers. 钢纤维混凝土的增强机制是基于定向钢纤维的存在限制了混凝土裂缝的形成和扩展, 钢纤维与混凝土的粘结性能对这种限制起着主导作用.而且钢纤维的外形不同影响作用亦不同.对于光滑表面的钢丝、剪切钢纤维而言, 由于它的表面粘结力小, 只能对产生裂缝的内部应力起传递作用, 即在可见裂缝形成后, 钢丝纤维的锚端阻止裂缝的扩展, 而将作用在裂缝上的应力分散传播到其它方向, 所以钢丝或剪切纤维只能限制可见裂缝的延伸.与此不同的是铣削钢纤维与水泥基体之间具有较强的粘结力, 因为它有较大的接触面积, 在硬化水泥浆体内, 铣削钢纤维的整个长度都呈现锚固形, 所以它能在最大程度上阻止混凝土内裂缝的形成. The reinforcement mechanism of steel fiber reinforced concrete (SFRC) is based on the fact that the existence of directional steel fibers limits the formation and propagation of cracks in concrete, and the bond between steel fibers and concrete plays a leading role in this limitation. The surface bonding force is small and can only transfer the internal stress which produces the crack. That is to say, after the crack is formed, the anchor end of the steel fiber prevents the crack from spreading, and the stress acting on the crack is dispersed to other directions, so the steel wire or the shear fiber can only limit the visible crack extension. There is a strong bond between D and cement matrix because it has a large contact area. In the hardened cement paste, the whole length of milling steel fiber is anchored, so it can prevent the formation of cracks in concrete to the greatest extent. |
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