| 纤维混凝土具有良好的材料性能 |
| 添加时间：2018/12/19 13:40:07 浏览次数： |
| 钢纤维的生产工艺中,主要问题是怎样有效的将纤维材料均匀的分散于混凝土内,避免纤维成团或密结。这与混凝土的投料次序有很大关系,一般应先将骨料与细集料进行干拌,然后加入已疏散的纤维材料,经搅拌均匀在加入水泥和水。若水泥和水加入过早,纤维吸水后,在水的表面张力和纤维之间的吸附力作用下,加之水泥的粘结作用,纤维结块成团,直接影响纤维的均匀性,这样会大大降低钢纤维的性能。 In the production process of steel fiber, the main problem is how to effectively distribute the fiber material evenly in concrete to avoid the agglomeration or densification of the fiber. This is closely related to the order of concrete feeding. Generally, aggregate and fine aggregate should be dry mixed first, then evacuated fiber material should be added, and cement and water should be added evenly after mixing. If cement and water are added too early, the surface tension of water and the adsorptive force between the fibers, together with the bonding effect of cement, the agglomeration of the fibers will directly affect the uniformity of the fibers, which will greatly reduce the performance of the steel fibers. 钢纤维混凝土具有良好的材料性能,与普通混凝土相比,其抗压强度提高2——20%;弯拉强度提高20——50%;劈裂抗拉强度提高20——40%;耐磨性能提高40%左右,其物理力理性能完全可以满足城市道路工程及检查井盖等配套构件需求技术指标。纤维粗糙而洁净的表面,能与混凝土中的水泥浆体牢固的结合,这是铣削钢纤维提高混凝土各种性能的根本原因。 Compared with ordinary concrete, steel fiber reinforced concrete has good material properties, and its compressive strength is increased by 2-20%, flexural strength by 20-50%, splitting tensile strength by 20-40%, and wear resistance by 40%. Its physical and mechanical properties can fully meet the technical requirements of supporting components such as urban road engineering and well cover inspection. Coarse and clean surface of fiber can be firmly combined with cement paste in concrete, which is the fundamental reason for milling steel fiber to improve various properties of concrete. 钢纤维砼表面湿润不少于7d,时间越长越好,用湿的草袋铺在表面或用养护材料。纤维转换梁保养时避免接触风、太阳、雨水等,应对施工梁体进行挡风、防雨等封闭处理。对于纤维转换梁,拆模时间应严格控制在达到规范规定的混凝土28d强度之后。如果遇冬季施工,可按常规办法采取防冻措施。 The surface of steel fiber reinforced concrete is wet for not less than 7 days. The longer the time, the better. Use wet straw bags to spread on the surface or use curing materials. When maintaining the fiber transfer beam, avoid contact with wind, sun, rain and so on. The construction beam body should be closed for wind and rain protection. For the fiber transfer beam, the demoulding time should be strictly controlled after reaching the concrete strength of 28d specified in the code. If winter construction occurs, anti-freezing measures can be adopted according to conventional methods. |
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