自密实高性能混凝土配合比优化设计及计算探讨

发布时间：2018-05-29 09:09

本文选题：配合比 + 优化设计　；参考：《混凝土》2017年10期

【摘要】：应用全计算方法,以粉煤灰、磨细钢渣粉、矿渣微粉、硅灰作为掺合料,进行混凝土配合比设计,通过全计算方法的系数、分别修正用水量和砂率,降低砂率和胶凝材料总量。与原全计算方法相比较,通过修改的全计算方法获得的取值在0.84~0.88范围内;当掺F-2型复合掺合料时,取值范围为0.91~0.93;掺F-1型和掺F-2型的复合掺合料时的砂率相差较小。采用优化后的配合比配制的C45混凝土的电通量小幅下降,在砂率和胶凝材料总量降低后,提高了混凝土抗渗透性能。结合工程实例,对计算后的配合比进行调整,结果表明工程实体在浇筑过程中,混凝土具有良好的上翻效果,中间无振捣,且一次成型。在待料期间,自密实混凝土坍落度损失变化较小,其流动性与和易性均满足指标要求。
[Abstract]:In this paper, using fly ash, fine steel slag powder, slag powder and silica fume as admixture, the mix ratio of concrete is designed. The water consumption and sand rate are corrected by the coefficient of the whole calculation method, and the sand rate and the total amount of cementing material are reduced. Compared with the original total calculation method, the value obtained by the modified total calculation method is in the range of 0.84 ~ 0.88, when F-2 type compound admixture is added, the value range is 0.910.93, and the sand ratio difference between F-1 type and F-2 type composite admixture is smaller. The electric flux of C45 concrete prepared with optimized mix ratio decreased slightly, and the permeability resistance of concrete was improved after the decrease of sand ratio and the total amount of cementing material. Combined with engineering examples, the calculated mix ratio is adjusted. The results show that the concrete has a good upturn effect, no vibration in the middle, and one molding in the process of pouring. During the waiting period, the slump loss of self-compacting concrete changes little, and its fluidity and easiness meet the requirements of the index.
【作者单位】：连云港职业技术学院建筑工程学院;安徽理工大学土木建筑学院;贵州顺康路桥咨询有限公司;
【基金】：2016年江苏省省级新型墙体材料专项基金项目
【分类号】：TU528

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