再生骨料的强化处理与掺加纤维对再生混凝土性能影响

发布时间：2018-06-07 13:04

本文选题：再生粗骨料 + 骨料多角度性　；参考：《北京交通大学》2014年硕士论文

【摘要】：本学位论文试验研究了骨料处理和掺加纤维对再生骨料混凝土性能的影响。论文对三种骨料(天然骨料NA、再生骨料RA、经过渗透结晶处理的再生骨料RA-1)的性能进行了测试,并对天然骨料及再生粗骨料的多角度性进行了尝试性表征。选择了三种增强再生骨料混凝土性能的方法：1、用渗透结晶材料对再生骨料进行处理；2、在再生骨料混凝土中加入聚丙烯纤维；3、在再生骨料混凝土中加入钢纤维。通过力学性能试验及耐久性能试验检验了三种增强方法的效果。论文主要分为两个部分：1、对粗骨料性能的研究。对天然骨料、再生骨料、处理后的再生骨料的级配性能、表观密度、吸水率和吸水性、压碎指标及坚固性的测试；对骨料的多角度性进行了表征,对比了天然粗骨料和再生粗骨料的差异。2、对再生骨料混凝土性能的研究。通过制备两个水胶比(0.26、0.60)共计十种混凝土来研究对骨料进行渗透结晶处理、聚丙烯纤维增强及钢纤维增强对再生骨料混凝土性能的影响。结果表明再生骨料RA的性能较差不仅体现在表观密度低、级配差、吸水率高、压碎指标差、坚固性指标差,在颗粒形状多角度性指标上也与天然骨料有较大差距。三种改良方法均有一定效果,其中对再生骨料进行渗透结晶处理在0.26水胶比能够显著提高再生骨料混凝土力学性能中的抗压强度和劈裂抗拉强度；掺加钢纤维在0.26水胶比的情况下亦能在不改变抗压强度的同时显著提高再生骨料混凝土的劈裂抗拉强度和断裂能；聚丙烯纤维的增强仅体现在对断裂能的提升上,且在0.60水胶比时的效果要好于0.26水胶比的,聚丙烯纤维的掺入对再生骨料混凝土的抗氯离子渗透能力有一定削弱作用。
[Abstract]:In this dissertation, the effect of aggregate treatment and fiber addition on the properties of recycled aggregate concrete was studied. In this paper, the properties of three kinds of aggregates (natural aggregate NA, recycled aggregate RA-1) were tested, and the multi-angle properties of natural aggregate and regenerated coarse aggregate were investigated. Three methods to enhance the performance of recycled aggregate concrete were selected: 1. The recycled aggregate was treated with osmotic crystallization material. Polypropylene fiber was added to recycled aggregate concrete and steel fiber was added to recycled aggregate concrete. The results of three reinforcement methods were tested by mechanical property test and durability test. The paper is divided into two parts: 1, the performance of coarse aggregate. The gradation performance, apparent density, water absorption and water absorption, crushing index and firmness of natural aggregate, recycled aggregate and treated recycled aggregate were tested. The performance of recycled aggregate concrete was studied by comparing the difference between natural coarse aggregate and recycled coarse aggregate. Ten kinds of concrete were prepared with two water-binder ratios of 0.26 ~ 0.60) to study the effects of percolation and crystallization of aggregate, reinforcement of polypropylene fiber and reinforcement of steel fiber on the properties of recycled aggregate concrete. The results show that the poor performance of recycled aggregate RA is not only reflected in low apparent density, grade difference, high water absorption, poor crushing index, poor firmness index, but also has a big gap with natural aggregate in the multi-angle index of particle shape. Among the three improved methods, the compressive strength and the splitting tensile strength of recycled aggregate concrete can be significantly improved by the permeation crystallization treatment of recycled aggregate at 0.26 water-binder ratio. Under the condition of 0.26 water-binder ratio of steel fiber, the splitting tensile strength and fracture energy of recycled aggregate concrete can be significantly improved without changing the compressive strength, and the reinforcement of polypropylene fiber is only reflected in the enhancement of fracture energy. When the ratio of water to binder is 0.60, the effect is better than that of 0.26. The addition of polypropylene fiber weakens the chloride penetration resistance of recycled aggregate concrete to some extent.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528

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