大掺量橡胶沥青同步碎石封层的试验研究

Experimental Study on High Content Rubber Asphalt Synchronous Crushed Stone Sealing Layer

将橡胶沥青中橡胶粉掺量提升的研究和应用愈发增多,其中大掺量橡胶沥青适用于同步碎石封层的应用场景,可有效起到应力吸收的功能性作用,充分发挥大掺量胶粉具有优异弹性与疲劳特性的特点,大掺量胶粉的橡胶沥青同步碎石封层以层间的抗剪性能为基础,通过研究对比材料性能、用量及路用性能。研究将通理论法和力学-经验设计方法设计同步碎石下封层的配合比,以层间抗剪强度为设计指标,选取斜剪试验进行模拟,进行大掺量橡胶沥青同步碎石封层材料的组成设计试验。并以普通掺量下即18%橡胶沥青制作碎石封层的性能对比,以此为实现大掺量橡胶沥青在同步碎石封层中的应用,解决半刚性基层反射裂缝的问题,实现废旧轮胎的高质化、高效化再利用进行基础技术储备。试验结果显示:基于力学-经验法或理论法均可以设计出性能更优良的大掺量橡胶沥青同步碎石封层,两者差异不大,相对18%橡胶沥青制作碎石封层,大掺量橡胶沥青同步碎石封层具有很高的抗拉强度、抗剪强度和动稳定度。

The research and application of increasing the amount of rubber powder in rubber asphalt are increasing,in which the large amounts of rubber asphalt are suitable for the application scenario of synchronous crushed stone sealing layer,which can effectively play a functional role in stress absorption and fully utilize the excellent elasticity and fatigue characteristics of large amounts of rubber powder.This rubber asphalt synchronous crushed stone sealing layer with large amounts of rubber powder is based on the shear resistance between layers,and through research and comparison of material properties,dosage and road performance.The theoretical method and the mechanical-empirical design method are used to design the mix ratio of synchronous crushed stone lower sealing layer.With the interlayer shear strength as the design index,the oblique shear tests will be selected to simulate the composition design test of large-amount rubber asphalt synchronous crushed stone sealing layer material.And compared with the performance of using 18%rubber asphalt as a crushed stone seal layer at a normal dosage,the application of large-amount rubber asphalt in synchronous crushed stone seal layers is achieved,which solves the problem of reflection cracks in semi-rigid base layers,and achieve the high-quality and efficient reuse of waste tires for basic technical reserves.The experimental results show that the mechanical empirical method or the theoretical method can be used to design the high-performance large-amount rubber asphalt synchronous crushed stone sealing layers,with little difference between the two.Compared with 18%rubber asphalt used for crushed stone sealing layers,the large-amount rubber asphalt synchronous crushed stone sealing layer has the high tensile strength,shear strength,and dynamic stability.