混杂钢纤维混凝土力学性能研究

发布时间：2018-05-12 10:19

本文选题：混杂钢纤维混凝土 + 抗压性能　；参考：《郑州大学》2017年硕士论文

【摘要】：钢纤维混凝土是将短钢纤维均匀分布于混凝土中能够产生增强增韧效果的复合建筑材料,其力学和耐久性能比普通混凝土有明显的提高,已在工程中得到了广泛的研究和应用。本文在已有钢纤维混凝土研究成果的基础上,研究了四种钢纤维中任意混杂其中两种不同类型钢纤维的钢纤维混凝土(SFRC)的抗压、抗剪、劈拉和弯曲韧性,主要研究内容和具体相关的试验成果如下所述:1.通过123个单一钢纤维混凝土以及两两混杂钢纤维混凝土立方体试块的抗压试验,研究钢纤维体积率、任意两种混杂钢纤维对混凝土受压性能的影响,得出各种钢纤维的增强系数及混杂钢纤维混凝土抗压强度的表达式。2.通过123个单一钢纤维混凝土以及两两混杂钢纤维混凝土立方体试块的劈拉强度试验,研究钢纤维体积率、任意两种混杂钢纤维对混凝土劈拉性能的影响,列举钢纤维混凝土劈拉强度和其它强度的联系,得出各种钢纤维的增强系数及混杂钢纤维混凝土劈拉强度的表达式。3.通过123个单一钢纤维混凝土以及两两混杂钢纤维混凝土试块的抗剪强度试验,研究钢纤维体积率、任意两种混杂钢纤维对混凝土抗剪性能的影响。列举钢纤维混凝土材料抗剪性能和其它强度的联系,得出各种钢纤维的增强系数及混杂钢纤维混凝土抗剪强度的表达式。4通过123个单一钢纤维混凝土以及两两混杂钢纤维混凝土小梁的弯曲试验,研究钢纤维体积率、任意两种混杂钢纤维对混凝土弯曲性能的影响,得出各种钢纤维的增强系数及混杂钢纤维混凝土抗折强度的表达式。5.通过123个单一钢纤维混凝土以及两两混杂钢纤维混凝土小梁的弯曲韧性试验,研究钢纤维体积率、任意两种混杂钢纤维对混凝土弯曲韧性的影响。据弯曲韧性荷载一挠度曲线,对比单一钢纤维混凝土以及两两混杂钢纤维混凝土小梁的弯曲韧度指数及承载能力变化系数。
[Abstract]:Steel fiber reinforced concrete (SFRC) is a kind of composite building material which distributes short steel fiber uniformly in concrete. Its mechanical and durability performance is obviously improved than that of ordinary concrete. It has been widely studied and applied in engineering. Based on the research results of steel fiber reinforced concrete (SFRC), the compressive, shear, splitting and flexural toughness of SFRCs with two different types of steel fibers are studied. The main research contents and related experimental results are as follows: 1. The effect of volume ratio of steel fiber and any two hybrid steel fibers on compressive properties of concrete was studied through compression tests of 123 steel fiber reinforced concrete (SFRC) and cube test blocks of pairwise hybrid steel fiber concrete (SFRC). The expressions of reinforcement coefficient of various steel fibers and compressive strength of hybrid steel fiber concrete are obtained. Based on the splitting tensile strength tests of 123 steel fiber reinforced concrete (SFRC) and steel fiber concrete cube specimens, the effects of volume ratio of steel fiber and any two hybrid steel fibers on the splitting tensile properties of concrete are studied. The relationship between splitting tensile strength and other strength of steel fiber concrete is listed, and the expressions of strengthening coefficient of various steel fibers and splitting tensile strength of hybrid steel fiber concrete are obtained. Based on the shear strength tests of 123 steel fiber reinforced concrete (SFRC) and steel fiber reinforced concrete (SFRC), the effects of volume ratio of steel fiber and any two kinds of hybrid steel fiber on the shear properties of concrete were studied. The relation between shear properties and other strength of steel fiber reinforced concrete is listed. The expressions of reinforcement coefficient of various steel fibers and shear strength of hybrid steel fiber concrete were obtained. 4. Through bending tests of 123 single steel fiber reinforced concrete and pairwise hybrid steel fiber concrete trabeculae, the volume ratio of steel fiber was studied. The effect of any two kinds of hybrid steel fibers on the flexural properties of concrete is studied. The reinforcement coefficient of various kinds of steel fibers and the expression of flexural strength of hybrid steel fiber concrete are obtained. Based on the bending toughness tests of 123 single steel fiber reinforced concrete and pairwise hybrid steel fiber concrete trabeculae, the effects of steel fiber volume ratio and any two hybrid steel fibers on the flexural toughness of concrete were studied. According to the flexural ductile load-deflection curve, the bending toughness index and load-bearing capacity change coefficient of single steel fiber reinforced concrete and pairwise hybrid steel fiber reinforced concrete trabeculae are compared.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.572

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