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.
Highlights
IntroductionEver-increasing traffic and growing axle loads have urged engineers and practitioners to use and adopt unconventional asphalt materials for the improvement of pavement performance [1,2,3,4]
Ever-increasing traffic and growing axle loads have urged engineers and practitioners to use and adopt unconventional asphalt materials for the improvement of pavement performance [1,2,3,4].Crumb rubber (CR), which is used as a modifier for asphalt, has been proven to endow asphalt with improved properties, i.e., better rutting resistance, fatigue resistance, water stability, antireflective cracking ability, and decreased road costs [5,6,7]
It was found that the viscosity of crumb rubber-modified asphalt (CRMA) will increase no matter what kind of rubber addition method is used
Summary
Ever-increasing traffic and growing axle loads have urged engineers and practitioners to use and adopt unconventional asphalt materials for the improvement of pavement performance [1,2,3,4]. Crumb rubber (CR), which is used as a modifier for asphalt, has been proven to endow asphalt with improved properties, i.e., better rutting resistance, fatigue resistance, water stability, antireflective cracking ability, and decreased road costs [5,6,7]. Crumb rubber-modified asphalt (CRMA) and crumb rubber asphalt mixtures (CRAMs) are very popular in engineering and research. Bressi et al [9] showed that the science and technology of the recycling of waste tire rubber is developing rapidly all over the world. It was found that the viscosity of CRMA will increase no matter what kind of rubber addition method is used
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