钢纤维简介

      钢纤维是当今世界各国普遍采用的混凝土增强材料。钢纤维混凝土中乱向分布的钢纤维主要作用是阻碍混凝土内部微裂缝的扩展和阻滞宏观裂缝的发生和发展。在受荷（拉、弯）初期，水泥基料与纤维共同承受外力，当混凝土开裂后，横跨裂缝的纤维成为外力的主要承受者。因此钢纤维混凝土与普通混凝土相比具有一系列优越的物理和力学性能。

钢纤维分类

      1、按外形划分有:平直形钢纤维(a)、压棱形钢纤维(b)、波形钢纤维(c)、弯钩形钢纤维(de)、大头形钢纤维(f)、双尖形钢纤维(g)、集束钢纤维(h)等等。

      2、按截面形状划分有:圆形(a)、矩形(b)、槽型(c)、不规则性(d)。

      3、按生产工艺划分有:切断钢纤维(用细钢丝切断)，剪切钢纤维(用薄钢板、带钢剪切)，铣削型钢纤维(用厚钢板或钢锭切削)，熔抽钢纤维(用熔融钢水抽制)。较有前途的是溶抽钢纤维，价格较低。

      4、按材质划分有:普碳钢纤维(抗拉强度一般在3002500MPa)，不锈钢纤维(按材质有304,310,330,430,446等)，其他金属纤维(铝纤维、铜纤维、钛纤维以及合金纤维)。

      5、按表面涂覆状态划分有:无涂覆层，表面涂环氧树脂，镀锌等。工业上大量使用的是无涂覆层的普通钢纤维。

      6、按施工工艺分类有:喷射用、浇注用。

      7、按直径尺寸分类有:普通钢纤维(直径d>0.08mm)，超细钢纤维(直径d0.08mm)，超细钢纤维主要用于增强塑料及石棉摩擦材料。

钢纤维特性

      钢纤维具有抗裂、抗冲击性能强、耐磨强度高、与水泥亲合性好，可增加构件强度，延长使用寿命等优点。

      1、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，其抗压强度提高1080（C50以上混凝土提高幅度显着），抗拉强度提高50100，抗弯强度提高5080，抗剪强度提高50100。试验表明，长度为515mm，长径比为1030的超短钢纤维抗压强度提高幅度较短纤维大得多，但抗拉强度、抗折强度较短纤维低得多。

      2、具有 的抗冲击性能；材料抵抗冲击或震动荷载作用的性能，称为冲击韧性，在公路水泥混凝土纤维材料钢纤维JT/T通常的纤维掺量下，冲击抗压韧性可提高27倍，冲击抗弯、抗拉等韧性可提高几倍到几十倍。

      3、收缩性能明显改善；在通常的纤维掺量下，钢纤维混凝土较普通混凝土的收缩值降低79。

      4、抗疲劳性能显着提高；钢纤维混凝土的抗弯和抗压疲劳性能比普通混凝土都有较大改善。当掺有1.5钢纤维抗弯疲劳寿命为1×106次时，应力比为0.68，而普通混凝土仅为0.51；当掺有2钢纤维混凝土抗压疲劳寿命达2×106次时，应力比为0.92，而普通混凝土仅为0.56。

      5、耐久性能显着提高；由于钢纤维混凝土抗裂性、整体性好，因而耐冻融性、耐热性、耐磨性、抗气蚀性和抗腐蚀性均有显着提高。

钢纤维用途

      钢纤维是一种性能优良、应用广泛的新型复合建筑材料，用它配制的混凝土已广泛用于：公路、机场、桥梁、隧道、涵洞、涵管、港口、海洋工程、水利水电工程、市政工程、水厂、游泳池、污水处理厂、堤防护坡、防爆放浪设施、矿山井巷、桩顶桩尖、铁路、轨枕、停车场、粮库、冶金耐火、军事工程、各种工业民用建筑的框架抗震节点及其他抗震结构、刚性防水屋面、地下室、工业厂房地面、混凝土井盖、井篦、电缆沟盖板及破损混凝土结构的修补加固、工程建筑物增强等。

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英文翻译

Steel fiber profile

Steel fiber concrete reinforced material is generally used to is in the world today. Steel fiber reinforced concrete in the disorderly to the distribution of main effect of steel fiber is the expansion of the internal micro cracks in concrete and block macroscopic crack occurrence and development. At the initial stage of the lotus (tensile, bending) the cement binders with fiber under external force, after concrete cracking, across the fracture of fibers become the main force to bear. So steel fiber reinforced concrete and ordinary concrete compared with a series of excellent physical and mechanical properties.

Classification of steel fiber

1, according to the shape classification are: flat steel fiber (a), pressure prismatic steel fiber (b), waveform steel fiber (c), curved hook steel fiber (d/e), big head shape steel fiber (f), double pointed steel fiber (g), the cluster steel fiber (h), and so on.

2, according to the cross section shape classification are: round, rectangular (b) (a), groove type (c), irregularity (d).

3, according to the production technology division are: to cut off the steel fiber with thin wire (cut), the shear steel fiber (shear) with thin plates, strip steel, milling steel fiber (cutting) with a thick steel plate or steel ingot, melt pumping steel fiber (molten steel and drawing). The most promising is pumping steel fiber, the lowest price.

4, according to the material is divided into: carbon-steel fiber (tensile strength is in commonly 300 300 mpa), stainless steel fiber (according to the material 346, etc.), other metal fibre (aluminum fiber, copper fiber, titanium and alloy).

5, according to the surface coating state division are: no coating layer, epoxy resin coating, galvanized, etc. Is widely used in industry is no ordinary steel fiber coating layer.

6, according to the construction technology of classification are: injection in, pouring in.

7, according to the size of diameter of classification are: the ordinary steel fiber (d > 0.08 mm) in diameter, ultrafine steel fiber diameter d (0.08 mm) or less, ultrafine steel fiber is mainly used for reinforced plastic and asbestos friction material.

Steel fiber USES

Steel fiber is a kind of excellent performance, widely used new type of composite building material, made of concrete with it has been widely used in highways, airports, Bridges, tunnels, culverts, the culvert, port, Marine engineering, water conservancy and hydropower engineering, municipal engineering, water, swimming pools, sewage treatment plant, embankment slope protection, explosion-proof turn facilities, mine, pile cap pile tip, rail, sleeper, parking lot, grain depot, metallurgy refractory, the framework of military engineering, all kinds of industrial and civil construction and other seismic structure, seismic node rigid waterproof roof, basement, industrial workshop floor, concrete manhole cover, well grate, in cable trench cover plate, and the repair of damaged concrete structure strengthening and enhancing the engineering building, etc.

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