新型橡胶颗粒沥青混合料特性试验研究

发布时间：2018-11-04 13:43

【摘要】：新世纪以来橡胶工业发展迅速，废旧橡胶制品日渐增多，以废旧橡胶轮胎为代表的废旧橡胶处理成为目前亟需解决的问题。许多研究者对此进行了大量研究，其中将废旧橡胶轮胎粉碎成颗粒铺筑路面是废旧轮胎回收的主要方式之一。本文将橡胶颗粒以集料的形式加入到沥青混合料中，形成橡胶颗粒沥青混合料，并进行了混合料特性的试验研究，取得具有一定工程实用价值的研究成果。基于AC-13连续型密级配的橡胶颗粒沥青混合料，对不同等级路面情况下，橡胶颗粒沥青混合料的水稳定性进行了试验研究。研究表明，在一级公路的沥青混合料中，加入橡胶颗粒后，沥青混合料的冻融前后的劈裂强度均出现降低；对于1-2mm的橡胶颗粒沥青混合料其冻融劈裂强度比均大于80%，满足规范要求；在低等级公路的沥青混合料中，细集料的增加，，提高了试件的密实度，降低了空隙率，在一定程度上提高了沥青混合料的水稳定性。通过冻融循环试验，研究了不同掺量的橡胶颗粒沥青混合料在多次冻融循环条件下其耐久性的变化情况，并应用灰色系统理论对试验结果进行预测分析。研究表明，沥青混合料的空隙率对劈裂抗拉强度影响较大，合适的橡胶颗粒掺量也可以取得较好的耐久性；建立的GM(1,1)模型可靠性较好，可以对冻融循环条件下橡胶颗粒沥青混合料的劈裂抗拉强度及空隙率的短期内发展情况进行预测。通过低温弯曲试验，对橡胶颗粒沥青混合料的低温抗裂性进行了研究，引入应变能密度值全面评价沥青混合料的低温抗裂性。研究表明，沥青混合料在掺加胶粒后，橡胶颗粒沥青混合料试件的破坏微应变均超过2300，满足冬寒区的技术指标；在胶粒掺量为1%左右时具有较大的弯曲应变能密度值，此时橡胶颗粒沥青混合料具有较好的低温抗裂性；随着温度的下降，沥青混合料破坏时的最大弯拉强度增大，弯拉应变降低，劲度模量增大。
[Abstract]:Since the rapid development of rubber industry in the new century, the waste rubber products are increasing day by day. The waste rubber treatment represented by waste rubber tires has become a problem that needs to be solved at present. Many researchers have done a lot of research on this, among which crushing waste rubber tires into granular pavement is one of the main ways of recycling waste tires. In this paper, rubber particles are added to asphalt mixture in the form of aggregate to form rubber grained asphalt mixture. The experimental study on the mixture characteristics is carried out, and the research results with certain practical engineering value are obtained. Based on the AC-13 continuous gradation of rubber granular asphalt mixture, the water stability of rubber particle asphalt mixture with different grade pavement was studied experimentally. The results show that the splitting strength of asphalt mixture decreases before and after freeze-thaw when rubber particles are added in the asphalt mixture of first class highway. For the rubber grained asphalt mixture of 1-2mm, the ratio of freeze-thaw splitting strength is more than 80, which meets the requirements of the specification. In the asphalt mixture of low grade highway, the increase of fine aggregate improves the compactness of the specimen, reduces the void ratio, and improves the water stability of the asphalt mixture to a certain extent. Through freeze-thaw cycle test, the change of durability of rubber granular asphalt mixture under several freeze-thaw cycles was studied, and the test results were predicted and analyzed by grey system theory. The results show that the porosity of asphalt mixture has a great influence on the splitting tensile strength, and the proper rubber particle content can also obtain better durability. The established GM (1 / 1) model is reliable and can be used to predict the short term development of split tensile strength and void ratio of rubber granular asphalt mixture under freeze-thaw cycle. The low temperature crack resistance of rubber granular asphalt mixture was studied by low temperature bending test. The strain energy density was introduced to evaluate the low temperature crack resistance of asphalt mixture. The results show that the microstrain of rubber particle asphalt mixture is more than 2300, which can meet the technical requirements of winter and cold regions. When the content of rubber particles is about 1%, the flexural strain energy density is larger, and the rubber grained asphalt mixture has good cracking resistance at low temperature. With the decrease of temperature, the maximum flexural tensile strength, flexural strain and stiffness modulus of asphalt mixture are increased.
【学位授予单位】：河南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U414

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