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钢纤维混凝土的生产和施工需要注意的事项
[来源:http://www.gangxianwei51.com] [作者:aowl] [日期:18-08-03] [浏览次数:]
钢纤维混凝土的生产和施工需要注意:1) 搅拌。钢纤维混凝土生产中的关键问题是如何保证钢纤维在混凝土中均勻分布,防 止形成纤维结团(纤维越细、越长,掺量越高,其分散性就越差)。因此,为保证钢纤维在 混凝土中的均匀分布,宜采取先干后湿的搅拌工艺。即先将钢纤维和粗细骨料干搅拌,把纤 维打散,然后再加人其他材料湿拌,且每次搅拌量不大于搅拌机公称容量的1/3,并适当延 长搅拌时间。2) 坍落度。钢纤维材料密度较大,混凝土容易出现分层、离析,而且坍落度损失也较 大。可通过上调胶凝材料用量和提高砂率的方法,适当加大出厂坍落度,若到达施工现场时 坍落度仍无法满足要求,可后加减水剂上调對落度。3) 泵机功率。由于钢纤维混凝土密度较大,栗送时与输送管道的摩擦较大,所以泵的 功率应比普通混凝土大20%。4) 防止混凝土离析、分层。由于钢纤维材质密度大,因此,当混凝土拌合物浇筑倾落 的自由高度超过1.5m时,应采用串筒、斜槽、溜管等措施,防止混凝土离析、分层。 The production and construction of steel fiber concrete should be noted: 1) mixing. The key problem in the production of steel fiber concrete is how to ensure the uniform distribution of steel fiber in concrete to prevent the formation of fiber agglomeration (the finer and longer the fiber is, the higher the amount of fiber, the worse the dispersion is). Therefore, in order to ensure the uniform distribution of steel fibers in concrete, the dry and wet mixing process should be adopted. At first, the steel fiber and the coarse aggregate are stirred, the fiber is dispersed, and then other materials are added to wet mix, and the amount of mixing is not more than 1/3 of the nominal capacity of the mixer, and the stirring time is extended properly. 2) slump. The density of steel fiber material is large, and the concrete is prone to stratification and segregation, and the slump loss is also large. By increasing the amount of cementitious materials and increasing the sand rate, the slump of the plant can be increased properly. If the slump can not meet the requirements when the construction site is reached, the drop will be up-regulated after the addition and reduction of the water. 3) pump power. Because of the high density of steel fiber reinforced concrete and the high friction between chestnut and pipeline, the pump power should be 20% higher than ordinary concrete. 4) prevent segregation and stratification of concrete. As the material density of steel fiber is large, so when the free height of pouring of concrete mixture is more than 1.5m, some measures should be adopted to prevent the segregation and stratification of concrete.

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