高韧性水泥基复合材料强度尺寸效应试验研究与正交分析

发布时间：2018-07-03 05:34

本文选题：尺寸效应 + 高韧性水泥基复合材料　；参考：《中国材料进展》2017年06期

【摘要】：尺寸效应是水泥基材料的固有特性,它与材料的配合比、强度以及结构组成等因素有关。高韧性水泥基复合材料是一种新型复合材料,具有优异的韧性,但同时其结构组成与普通混凝土相比也具有较大差异。然而,目前针对尺寸效应的研究大多限于普通混凝土和高强混凝土,并且尚无相关标准对高韧性水泥基复合材料尺寸效应的处理作出规范。为了探究该种复合材料的抗压强度尺寸效应,本文采用两种不同尺寸的立方体试件,对16组不同配合比的高韧性水泥基复合材料进行了单轴抗压试验和正交分析,研究了纤维掺量、水胶比、粉煤灰掺量和砂胶比这4个因素对材料强度尺寸效应的影响情况。试验结果表明:与普通混凝土相比,高韧性水泥基复合材料的脆性特征明显减小;诸因素对尺寸效应影响的主次顺序为水胶比纤维掺量粉煤灰掺量砂胶比,其中水胶比和纤维掺量的影响均非常显著,而砂胶比对尺寸效应影响甚微。
[Abstract]:Size effect is the inherent characteristic of cement based materials, which is related to the mix ratio, strength and structure composition of the material. High toughness cement matrix composite is a new type of composite with excellent toughness, but its structural composition is also different from that of ordinary concrete. However, most of the research on dimensional effect is limited to ordinary concrete and high strength concrete, and there is no standard to deal with the dimensional effect of high toughness cement matrix composites. In order to investigate the size effect of compressive strength of this kind of composite, the uniaxial compression test and orthogonal analysis of 16 groups of high toughness cement matrix composites with different mix ratio were carried out by using two kinds of cube specimens of different sizes. The effects of fiber content, water / binder ratio, fly ash content and sand / binder ratio on the strength and size effect of the material were studied. The experimental results show that the brittleness of high toughness cement matrix composites is obviously reduced compared with ordinary concrete, and the primary and secondary order of the effects of various factors on the size effect is the ratio of water to binder ratio of fiber to fly ash, and the ratio of sand to binder to fly ash. The effects of water / binder ratio and fiber content are very significant, while the size effect of sand / binder ratio has little effect.
【作者单位】：后勤工程学院军事土木工程系;后勤工程学院训练部;
【基金】：重庆市高校优秀成果转化资助重点项目(KJZH14220)
【分类号】：TU528

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