Ten-Year Performance Evaluation of Asphalt-Rubber Surface Mixes

Abstract

In 1988, the Florida legislature passed a bill directing the Florida Department of Transportation (FDOT) to investigate the feasibility and potential use of ground tire rubber (GTR) in asphalt-concrete mixtures. To address this legislative mandate, the FDOT planned and constructed three test projects to define performance that would allow for rational decisions about the use of GTR in Florida. A major finding of a 10-year performance evaluation of these test sites is that the wet process addition of rubber improved the crack resistance of surface mixtures. State Road 16 test sections with wet process rubberized mixes showed about 1 to 6 percent cracked areas, depending on the amount of rubber, whereas those with virgin asphalt or dry-mixed asphalt rubber showed about 30 percent cracked areas. In addition, the cracking data collected during this evaluation appear to suggest that an effective optimum rubber content is within the 10 to 15 percent range. The long-term performance evaluation program of the three test projects is described here and its findings are discussed.

Modul elastičnosti asfalta s bitumenom modificiranim gumenim granulatom kao vezivom

“…This crumb rubber modified bitumen, which has beneficial engineering characteristics of both ingredients, is then used for asphalt mixtures [3,4,6]. Currently, the characteristics of asphalt mixtures made using the wet process are better compared to the dry process [7,8].…”

“…During this production process, in which disadvantages of the traditional wet process have been eliminated, a special kind of rubber modified bitumen is produced by incorporating bitumen and crumb rubber [7,8]. The CSRB is a binder made of bitumen (85 ± 2 m/m%), crumb rubber (15±2 m/m%), and a special multifunctional additive (0,3 ± 0,2 m/m%).…”

Agregados de garrafa PET tornam o asfalto mais resistente após irradiação com luz visível

“…No entanto o crescente número de veículos tem estimulado modificações das propriedades dos asfaltos (BHAGEERATHY, et al, 2014). Por muitas décadas vários pesquisadores têm tentado alterar o asfalto por meio da adição de fibras e borrachas (CHOUBANE et al, 1999;SWAMI et al, 2012). Países europeus bem como o Brasil têm introduzido polímeros na mistura asfáltica desde a década de 70 como importante estratégia de reuso do plástico lançado ao meio ambiente (RAMOS et al, 1995;BERNUCCI et al, 2008;BERNUCCI et al 2008;AHMADINIA et al, 2011;CNT 2016).…”

Using Crump Rubber (CR) of Scrap Tire in Hot Mix Asphalt Design

“…The use of CRM asphalt is environmental friendly solution, since the use of this material partially reduces the need for new raw materials and improves the performances and life cycle of asphalt pavements (Miriam, 2009;Choubane et al, 1999). Several researchers studied the CRM asphalt.…”