Abstract
This research has used crumb rubber in asphalt mixture as a part of the coarse and fine aggregate. Three sieve sizes of crumb rubbers were used in asphalt mixture No. 4, No. 8 and No. 50, with five percent of asphalt cements (4, 4.5, 5, 5.5 and 6%) by weight and four percent of crumb rubbers (10, 20, 30 and 40%) by weight used as an aggregate for preparing asphalt mixture specimens. The Hot Mix Asphalt (HMA) Marshal test method for asphalt mixture specimens was used; 72 specimens were prepared for evaluation of Marshall Properties (flow, Stability, bulk density, air void percentage and void in mineral aggregate). Previous studies showed that the crumb rubber has further effects on the performance of asphalt mixture by increasing its Marshall flow, stability, air voids and decreasing the bulk density. It is concluded that the crumb rubber as a fine aggregate improves the stability and flow with respect to a crumb rubber as a coarse aggregate.
Highlights
Transport Engineering is an application of scientific principles and technology in the planning, design, operation and management of transportation facilities in a manner that is safe, fast, convenient, easy, economical and environmentally friendly to transport people and goods
Crumb rubber in cold mixtures based on the idea of maximizing the valorization of recycled materials together was developed by Pettinari and Simone (2015)
Cetin (2013) studied the effects of crumb rubber size and concentration on the performance of porous asphalt mixtures; the purpose of the research was to investigate the effect of size distribution and concentration of crumb rubber on the performance characteristics of porous asphalt mixture
Summary
Transport Engineering is an application of scientific principles and technology in the planning, design, operation and management of transportation facilities in a manner that is safe, fast, convenient, easy, economical and environmentally friendly to transport people and goods. It is a major branch of civil engineering that is divided into four major sections: Roads engineering, trains engineering, airports engineering, ports and waterways engineering. Two dissimilar gradations of crumb rubber have been approved for the production of a cold recycled mixture stabilized with bitumen and cement. It was concluded that the gradation of the approved crumb rubber wisely affects the compaction and mechanical properties of the mixture
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