微钢纤维与骨料粒径匹配效应的研究

发布时间：2018-04-07 18:19

本文选题：钢纤维　切入点：骨料粒径　出处：《安徽理工大学》2017年硕士论文

【摘要】：在当代社会建设中,随着科学技术的进步与发展,建筑行业里也出现了一个又一个新的世界纪录,建筑行业正向着更高、更强、更好的方向去创新发展。钢纤维混凝土应运而生,钢纤维混凝土是将乱向分布的短钢纤维掺入到普通混凝土中形成的一种新型的多相复合材料。这些乱向分布的钢纤维能够有效地阻碍混凝土内部宏观裂缝的形成及微裂缝的扩展,能够较好地改善了混凝土的抗拉、抗弯、抗冲击及抗疲劳性能,具有较好的延性,因此钢纤维混凝土在抗震结构中得到了广泛的应用。目前,众观当代国内外学者,已有很多对钢纤维混凝土有了比较深入的研究,本文将结合前人的研究,着重对微钢纤维与骨料粒径匹配效应的研究。通过在混凝土中加入不同含量的钢纤维与不同大小粒径粗骨料,进而更加深入地研究钢纤维混凝土与粗骨料粒径匹配关系及相关性能的影响。本文选取1种微钢纤维直径为0.2 mm,长度为13 mm(长径比为65)及4种不同粒径的粗骨料,骨料粒径分别为0mm、5-10 mm、10-15 mm、15-20 mm。实验设计了 2种不同强度等级的混凝土,强度分别为C30、C50;3种不同的纤维掺量,掺量分别为0%、1%、2%,实验过程分别研究C30、C50混凝土在掺杂不同粒径粗骨料与不同含量钢纤维之后相关性能。本实验分4批完成,在C30、C50混凝土中分4种不同粒径的粗骨料混凝土,在每种粒径骨料的混凝土中加入3种不同含量的钢纤维,共设计了 24组,其中C30、C50混凝土各12组,在每组试件中制作了 3个150mm**150 mm*300 mm应力应变试块、3 个 150 mm*150 mm*300 mm劈裂抗拉试块、3 个 100 mm*100 mm*400 mm长方体弯曲韧性试块、2个150 mm*150 mm*300mm用作切割的外观试块(此试块在本文中不作过多阐述),共有264个试块。通过对各试块性能研究,得出圆柱体轴心抗压强度与粗骨料粒径关系,圆柱体轴心抗压强度与纤维掺量关系,圆柱体轴心抗压强度与骨料粒径和纤维掺量两者匹配效应关系;劈裂抗拉强度与粗骨料粒径关系,劈裂抗拉强度与纤维掺量关系,劈裂抗拉强度与骨料粒径和纤维掺量两者匹配效应关系;弯曲韧性与粗骨料粒径关系,弯曲韧性与纤维掺量关系,应力-应变与粗骨料粒径关系,应力-应变与纤维掺量关系。研究成果对工程实际应用和理论研究有着一定的参考价值。
[Abstract]:In the construction of contemporary society, with the progress and development of science and technology, the construction industry has also appeared a new world record one after another. The construction industry is moving towards higher, stronger and better direction to innovate and develop.Steel fiber reinforced concrete (SFRC) is a new type of multiphase composite material, which is formed by mixing short steel fibers randomly distributed into ordinary concrete.These disorderly distributed steel fibers can effectively hinder the formation of macroscopic cracks and the propagation of micro-cracks in concrete, and can improve the tensile, flexural, impact and fatigue resistance of concrete, and have good ductility.Therefore, steel fiber reinforced concrete (SFRC) has been widely used in seismic structures.At present, many scholars at home and abroad, there have been a lot of more in-depth research on steel fiber concrete, this paper will combine with previous research, focusing on the micro-steel fiber and aggregate particle size matching effect.By adding different content of steel fiber and coarse aggregate of different size into concrete, the matching relation between steel fiber concrete and coarse aggregate and the influence of relative properties were studied.In this paper, a kind of micro-steel fiber with a diameter of 0.2 mm, a length of 13 mm (ratio of length to diameter 65) and four kinds of coarse aggregate with different sizes are selected. The diameter of aggregate is 0 mm ~ 5 ~ 10 mm ~ 10 mm ~ (-15) mm ~ (15) mm ~ (15) mm ~ (-1).Three 150mm**150 mm*300 mm stress-strain test blocks were made in each set of specimens, and three 150 mm*150 mm*300 mm split tensile test blocks and three 100 mm*100 mm*400 mm cuboid bending ductile blocks were made, and 2 150 mm*150 mm*300mm were used as external cut test blocks.There are 264 test pieces in this paper.The relationship between axial compressive strength of cylinder and diameter of coarse aggregate, axial compressive strength of cylinder and fiber content, matching effect of axial compressive strength of cylinder with diameter of aggregate and fiber content are obtained by studying the properties of each sample.The relationship between splitting tensile strength and coarse aggregate particle size, split tensile strength and fiber content, the matching effect between splitting tensile strength and aggregate diameter and fiber content, the relationship between bending toughness and coarse aggregate particle size, the relationship between splitting tensile strength and fiber content, the relationship between splitting tensile strength and fiber content, the relationship between splitting tensile strength and fiber content, the relationship between splitting tensile strength and fiber content,The relationship between flexural toughness and fiber content, between stress-strain and coarse aggregate particle size, and between stress-strain and fiber content.The research result has certain reference value to the engineering practical application and the theory research.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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