橡胶混凝土耐久性试验研究

发布时间：2018-07-15 19:08

【摘要】：将废旧轮胎等橡胶制品粉碎制成不同规格的橡胶颗粒，然后将橡胶颗粒以一定的掺配方式掺入混凝土中，所形成的复合材料称为橡胶混凝土。已有研究和工程实践表明，与普通混凝土相比，橡胶混凝土的抗压、抗拉等静力性能有所下降，但其耐久性能、抗冲击性能、热工性能等均得到不同程度的改善，且橡胶混凝土的研制和应用为废旧橡胶的回收再利用提供了新的途径，具有显著的环保效益。但与力学性能研究相比，橡胶混凝土的耐久性能研究较少，且缺乏系统性的研究和规律性的结论，阻碍了橡胶混凝土的推广应用。本文以橡胶混凝土的耐久性能为研究对象，以试验研究为主要手段，将5-8目、30-40目、60-80目等三种粒径的橡胶颗粒，按5%、10%、15%的比率等体积取代混凝土中的细骨料制备了橡胶混凝土，重点对橡胶混凝土的抗冻融循环性能、抗氯离子渗透性能、抗碳化性能等耐久性指标进行了系统研究，并研究了冻融循环和氯离子渗透二种情况的耦合作用，得出了随橡胶粒径和掺量变化对橡胶混凝土各耐久性指标的影响规律，基于试验结果和已有经验公式，建立了各耐久性指标的劣化模型。研究结果表明，橡胶颗粒的掺入明显改善了混凝土的抗冻融循环性能和抗氯离子渗透性能，，橡胶颗粒粒径越小改善效果越明显，抗冻融循环性能改善的最佳掺量为10%，抗氯离子渗透性能改善的最佳掺量为5%；橡胶颗粒的掺入可以改善混凝土的抗碳化性能，但效果不明显，最优掺量为10%；冻融循环后橡胶混凝土的抗氯离子渗透性能下降明显，且随着冻融循环次数的增加下降趋势越来越明显，综合考虑抗冻融循环性和抗氯离子渗透性能，最优掺量为10%。
[Abstract]:Rubber particles of different specifications are made from rubber products such as waste tires, and then rubber particles are mixed into concrete in a certain way. The composite material is called rubber concrete. The research and engineering practice show that compared with ordinary concrete, the static properties of rubber concrete, such as compressive and tensile resistance, are decreased, but the durability, impact resistance and thermal performance of rubber concrete are improved to some extent. The development and application of rubber concrete provide a new way for recycling waste rubber. However, compared with the study of mechanical properties, the study of durability of rubber concrete is less, and lack of systematic research and regular conclusion, which hinders the popularization and application of rubber concrete. In this paper, taking the durability of rubber concrete as the research object and taking the experimental study as the main means, three kinds of rubber particles, such as 5-8 mesh, 30-40 mesh and 60-80 mesh, were prepared by replacing the fine aggregate in the concrete at the ratio of 51010% to 15%, and the rubber particles of 5-8 mesh, 30-40 mesh and 60-80 mesh were substituted for the fine aggregate in the concrete. The durability indexes of rubber concrete, such as anti-freezing and thawing cycle performance, chloride ion penetration resistance and carbonation resistance, are studied systematically, and the coupling effects between freeze-thaw cycle and chloride ion permeation are studied. The influence of rubber particle size and content on the durability index of rubber concrete is obtained. Based on the experimental results and empirical formulas, the deterioration model of each durability index is established. The results show that the mixing of rubber particles obviously improves the freeze-thaw resistance and chloride ion permeability of concrete, and the smaller the size of rubber particles, the more obvious the improvement effect is. The optimum content of improving the anti-freeze-thaw cycle performance is 10%, the best content of improving the chlorine ion permeation property is 5%, the addition of rubber particles can improve the carbonation resistance of concrete, but the effect is not obvious, the optimum content is 10%. After freeze-thaw cycle, the resistance to chloride ion permeability of rubber concrete decreased obviously, and with the increase of freeze-thaw cycle times, the decreasing trend was more and more obvious. Considering the anti-freezing and thawing cycle resistance and chloride ion permeation performance, the optimum content was 10.
【学位授予单位】：沈阳大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU528

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