A New Type of Crumb Rubber Asphalt Mixture: A Dry Process Design and Performance Evaluation

Abstract

To obtain a crumb rubber asphalt mixture with excellent performance, this study combined trans-polyoctenamer rubber (TOR), crumb rubber, and other additives to establish a new type of crumb rubber (CRT). The objective of this study was to design and evaluate the road performance of the new type of crumb rubber asphalt mixture (CRTAM) with a skeleton dense texture through a dry process. First, the skeleton intrusion compact volume method was used to optimize the grading of coarse and fine aggregates, and the design of the CRTAM gradation was carried out through the same and unequal volume replacement grading method. Then, three types of road performance were analyzed: high-temperature stability, low-temperature crack resistance, and water stability. The results showed that 2% and 2.5% CRT met a low-temperature index with equal volume substitution, and the six gradations obtained by unequal volume replacement with 2% CRT complied with the requirements of a skeleton dense texture. When the substitution ratio was 1.5 and 0.5, the high-temperature performance was better. In addition, when the substitution ratio was 0.5, the flexural strain energy density was the highest and the low-temperature performance was the best. Including considerations of economic benefits, it is recommended that the CRT content be 2% and the substitution ratio be 0.5.

Study on Properties and Micro-Mechanism of RHB-SBS Composite-Modified Asphalt

“…To alleviate the pressure of non-renewable energy shortage and contribute to the “double carbon” goal, an economical, practical, and environmentally friendly composite material is needed to modify asphalt [ 1 ]. Compared with matrix asphalt, SBS-modified asphalt shows great advantages in various properties under high-temperature and low-temperature conditions.…”

Evaluación experimental de la resistencia del concreto modificado con caucho

“…Se han realizado numerosos estudios para mejorar sus propiedades mecánicas, mediante la sustitución de parte del agregado pétreo por caucho obtenido de neumáticos desechados (Topcu, 1995;Khatib & Bayomy, 1999;Retama & Ayala, 2017) (figura 1). En comparación con las mezclas de caucho empleadas en pavimentación asfáltica, su uso es limitado en material PCC (Huang, Li, Pang, & Eggers, 2004;Shu & Huang, 2014;Ma, Dai, Fu, Liu, Dong, & Huang, 2020). El empleo de granulado para reemplazar parte del agregado fino o grueso mejora algunas de sus propiedades mecánicas, mientras que otras se reducen, como su resistencia a la compresión (Khatib & Bayomy, 199;Xue & Pei, 2018;Li, Stubblefield, Garrick et al, 2004).…”

“…En tanto que Sadowski y Pietras (2014) hicieron ensayos con la mezcla de concreto y caucho como subrasante, o en carreteras, en probetas sometidas a compresión uniaxial cíclica y flexión cíclica. Más recientemente, Ma et al (2020) desarrollaron un nuevo método para mejorar el rendimiento de la mezcla asfáltica, modificada con caucho granulado y a la que se incorporan aditivos para diseñar el proceso seco de la mezcla.…”

Building Sustainable Pavements: Investigating the Effectiveness of Recycled Tire Rubber as a Modifier in Asphalt Mixtures

“…Furthermore, researchers have also investigated potential improvements to the traditional technique. Ma et al [31], for example, investigated the combination of transpolyoctenamer rubber (TOR), crumb rubber, and other additives to establish a new type of crumb rubber (CRT) to determine its effect on performance. Beyond this technique, and with the positive outcomes regarding potential advantages of rubber-based material inclusion within AC mixes, a newer technique has emerged that included the end-of-life rubber material within AC mixes.…”