自密实钢纤维全轻混凝土配合比设计及钢纤维分布规律试验研究

发布时间：2018-05-04 10:40

本文选题：自密实 + 全轻混凝土　；参考：《华北水利水电大学》2017年硕士论文

【摘要】：对于自密实轻骨料混凝土,钢纤维的加入,使自密实轻骨料混凝土在轻质高强的性能上又增加了其抗裂性、韧性,使之更能符合新型建筑材料的要求。本文对目前国内外的有关研究成果进行了较为系统的总结。并通过自密实混凝土的研究方法的绝对体积法,参考轻骨料混凝土的配合比设计方法并采用钢纤维替代粗骨料的计算方法对自密轻骨料混凝土进行配合比设计和相关的试验研究。本文采用试验的方法配制出满足自密实性能的自密实钢纤维全轻混凝土,并研究了钢纤维体积率、骨料粒径等因素对混凝土拌合物工作性能的影响,及骨料粒径对钢纤维分布规律的影响。其中钢纤维分布规律是本文研究的重点。本试验主要研究内容与结果如下:1、按照《自密实混凝土应用技术规程》(JGJ/T283-2012)中混凝土拌合物工作性能的测试方法,分别测试自密实钢纤维全轻混凝土拌合物的填充性、间隙通过性和抗离析性,并分析各因素对混凝土拌合物工作性能的影响规律,确定所拌制混凝土的适用范围。结果表明,骨料粒径和钢纤维掺量对工作性能的影响先降低后增加。所配置的自密实钢纤维全轻混凝土基本全部满足工作性能要求。2、以水胶比为0.31,波浪形钢纤维为基准,研究钢纤维体积分数为0%、0.8%、1.2%、1.6%是对自密实钢纤维全轻混凝土骨料最大粒径分别为M10、M16、M20工作性能的影响。结果表明:钢纤维体积率1.2%,骨料粒径为M10时,工作性能最好。3、以水胶比为0.31,波浪形钢纤维为基准,研究钢纤维体积分数为1.2%时骨料粒径M19,M16,M20对钢纤维分布规律的影响。研究结果表明:M10分布规律最均匀,M16和M20近似相同。
[Abstract]:For self-compacting lightweight aggregate concrete, the addition of steel fiber can increase the crack resistance and toughness of self-compacting lightweight aggregate concrete in light and high strength, so that it can meet the requirements of new building materials. In this paper, the research results at home and abroad are systematically summarized. And through the absolute volume method of self-compacting concrete research, According to the design method of mix ratio of lightweight aggregate concrete and the calculation method of replacing coarse aggregate with steel fiber, the mix ratio design and related experimental study of self-compacting lightweight aggregate concrete are carried out. In this paper, the self-compacting steel fiber all-light concrete is prepared by means of experiment. The effects of the volume ratio of steel fiber and the particle size of aggregate on the working performance of concrete mixture are studied. And the effect of aggregate particle size on the distribution of steel fiber. The distribution of steel fiber is the focus of this paper. The main contents and results of this experiment are as follows: 1. According to the test method of the performance of the concrete mixture in JGJ / T283-2012), the filling properties of the self-compacting steel fiber total light concrete mixture are tested respectively. The effects of various factors on the performance of concrete mixture were analyzed and the applicable range of concrete was determined. The results show that the effect of aggregate particle size and steel fiber content on the working properties decreases first and then increases. The fully lightweight self-compacting steel fiber concrete has basically met the working performance requirement of 0.2.The reference is the water-binder ratio of 0.31 and the wavy steel fiber. The effect of steel fiber volume fraction of 0 and 0.8% and 1.6% on the working performance of self-compacting steel fiber whole light concrete aggregate with maximum particle size of M10 / M16 / M20 was studied. The results show that when the volume ratio of steel fiber is 1.2 and the aggregate particle size is M10, the working performance is the best. The effect of aggregate size M19 M16 / M20 on the distribution of steel fiber is studied on the basis of water / binder ratio of 0.31 and wavy steel fiber as the reference point, when the volume fraction of steel fiber is 1.2, the effect of aggregate size M19 / M16 / M20 on the distribution of steel fiber is studied. The results show that the distribution law of M10 is approximately the same as M16 and M20.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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