Abstract
To further reveal the road performance and noise reduction performance of open‐graded friction course (OGFC), the crumb rubber prepared by adding waste tires were considered, and the performance requirements of the material were put forward. To avoid the influence of rubber particle swelling on aggregate, the special gradation and mix proportion of OGFC mixture were designed, and the particle size of 4.75 mm was proposed as the control size. The test results show that the aggregate forms a good embedded structure. The resilient modulus, deformation performance, and fatigue performance of R‐OGFC asphalt mixture with different crumb rubber contents were studied. According to the test results, the rubber particle content under the best road performance and noise reduction effect was proposed. The results show that, after adding a certain amount of crumb rubber, the performance of asphalt mixture has been greatly improved, especially the dynamic stability has been improved by 84%. Although the resilient modulus has decreased by 10%, the creep performance has decreased by 37%, and the fatigue life has decreased by 31% (2% rubber content), the noise reduction can reach 3.6–8.6 dB, and the noise reduction performance is significant. This shows that the best content of rubber particles is between 1.5% and 2%, and the R‐OGFC mixture modified by rubber has a good application prospect.
Highlights
With the rapid increase of the number of motor vehicles [1], the noise and waste tire problems caused by it affect the urban environment more and more. erefore, the noise reduction technology of grinding waste tires into rubber powder [2, 3] applied to the road has been greatly developed
Bennert [22] found that open-graded friction course (OGFC) pavement with crumb rubber had better noise reduction effect than OGFC pavement without crumb rubber. rough long-term observation, Tehrani [23] found that the noise reduction effect of densegraded rubber asphalt pavement could be maintained for more than 6 years, while that of ordinary hot mix asphalt pavement was at most 4 years and that of open-graded asphalt mixture was less
On the premise of ensuring a certain air void, adding crumb rubber can improve the performance of the mixture. e purpose of this paper is to evaluate the technical performance of open-graded asphalt mixture (ROGFC) modified by dry process rubber. e volume substitution method is used for mix design. e high temperature performance, water stability, elastic performance, deformation performance, and fatigue performance of the mixture are tested, and the road performance of rubber asphalt is analyzed
Summary
With the rapid increase of the number of motor vehicles [1], the noise and waste tire problems caused by it affect the urban environment more and more. erefore, the noise reduction technology of grinding waste tires into rubber powder [2, 3] applied to the road has been greatly developed. Bueno [11] added waste tire rubber particles into asphalt pavement, evaluated the vibration reduction effect, and considered that crumb rubber asphalt pavement had greater porosity, so it had a good noise reduction effect. E service life of pavement can be effectively increased by using modifier such as waste rubber powder, increasing the number of polar functional groups of crumb rubber and improving the bonding ability and roughness between asphalt and aggregate [16]. Rough long-term observation, Tehrani [23] found that the noise reduction effect of densegraded rubber asphalt pavement could be maintained for more than 6 years, while that of ordinary hot mix asphalt pavement was at most 4 years and that of open-graded asphalt mixture was less. E porosity of open-graded asphalt mixture is larger, it is not as good as gap-graded asphalt mixture in mechanical properties; it has better noise reduction effect.
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