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                當前位置:鋼纖維混凝土的生產和施工需要注意的事項
                鋼纖維混凝土的生產和施工需要注意的事項
                [來源:http://www.www.tjejtrampet.com] [作者:aowl] [日期:18-08-03] [瀏覽次數:]
                鋼纖維混凝土的生產和施工需要注意:1) 攪拌。鋼纖維混凝土生產中的關鍵問題是如何保證鋼纖維在混凝土中均勻分布,防 止形成纖維結團(纖維越細、越長,摻量越高,其分散性就越差)。因此,為保證鋼纖維在 混凝土中的均勻分布,宜采取先干后濕的攪拌工藝。即先將鋼纖維和粗細骨料干攪拌,把纖 維打散,然后再加人其他材料濕拌,且每次攪拌量不大于攪拌機公稱容量的1/3,并適當延 長攪拌時間。2) 坍落度。鋼纖維材料密度較大,混凝土容易出現分層、離析,而且坍落度損失也較 大??赏ㄟ^上調膠凝材料用量和提高砂率的方法,適當加大出廠坍落度,若到達施工現場時 坍落度仍無法滿足要求,可后加減水劑上調對落度。3) 泵機功率。由于鋼纖維混凝土密度較大,栗送時與輸送管道的摩擦較大,所以泵的 功率應比普通混凝土大20%。4) 防止混凝土離析、分層。由于鋼纖維材質密度大,因此,當混凝土拌合物澆筑傾落 的自由高度超過1.5m時,應采用串筒、斜槽、溜管等措施,防止混凝土離析、分層。 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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