| 纲纤维混凝土结构上的优点 |
| 添加时间：2017/5/18 14:32:29 浏览次数： |
| 与传统的钢筋混凝土相比, 纲纤维混凝土具有许多结构上的优点, 钢纤维呈三维均匀分布, 使混凝土的应力在结构材料的横截面及其长度方向更加均匀分散, 避免了应力集中, 故能有效地减少裂缝或阻止裂缝的引伸和扩展, 只要掺入数量较少的钢纤维就能明显地减少混凝土的开裂.Grzybowski和Shah指出, 只要掺入0 .25 %～ 0 .50 %(体积分数, 下同)的圆直钢纤维于混凝土中, 即能减小由于干缩而形成的裂缝宽度达80 %以上, 且随着纤维掺量的增加, 形成裂缝的时间亦得到延缓, 而Bentur认为掺钢纤维水泥浆体的开裂与纤维同基体间的界面状况及其粘结力有很大的关系, 本研究通过掺钢纤维水泥砂浆的抗裂性、钢纤维的粘结性能和恒定荷载冲击等一系列实验室试验, 对不同品种和掺量钢纤维混凝土的抗裂性能进行了试验和分析研究. Compared with the traditional reinforced concrete, steel fiber concrete has many advantages in structure, the steel fiber in the three-dimensional uniform distribution, the stress of the concrete structure material in the direction of cross section and its length is more evenly dispersed, avoid the stress concentration, so it can effectively reduce or prevent cracks extension and extension, as long as the incorporation of a small number of steel fiber can obviously reduce the cracking of concrete. Create the Shah, and points out that, as long as adding 0. 25% ~ 0. 50% (volume fraction, the same below) of the round straight steel fiber in concrete, which can decrease due to drying shrinkage and crack width of more than 80%, and with the increase of fiber content, also get delay time of crack formation, and Bentur think mixing steel fiber cracking of cement paste and the status and bond between fiber and matrix interface has a lot to do, this study by mixing the crack resistance of steel fiber cement mortar, steel fiber bonding performance and a series of laboratory tests, such as a constant load, with different varieties and dosage of steel fiber reinforced concrete crack resistance test and analyses research. |
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