Enhanced Storage Stability and Rheological Properties of Asphalt Modified by Activated Waste Rubber Powder.

Weihong Liu,Yishen Xu,Hongjun Wang,Jose Norambuena-Contreras,Benan Shu,Diego Barbieri

doi:10.3390/ma14102693

Weihong Liu, Yishen Xu + Show 4 more

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https://doi.org/10.3390/ma14102693

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Abstract

Segregation of waste crumb rubber powder (WR) modified asphalt binders the large-scale application of WR in asphalt. The method of microwave activation combined with chemical activation (KMWR) was proposed to improve storage stability and rheological properties of WR modified asphalt in this work. Storage stability and rheological properties of virgin asphalt, MWR modified asphalt, and KMWR modified asphalt were comparatively studied by the standard segregation test, bending beam rheometer (BBR) test, and dynamic shear rheometer (DSR) test. The effect of composite activation on waste rubber powder particles was studied by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), and Brunauer–Emmett–Teller (BET) tests. The main results showed that after the physical and chemical composite activation, the storage stability of waste rubber powder modified asphalt was significantly improved, WR modified asphalt had better crack resistance, better rutting resistance, and better fatigue performance. After physical and chemical activation, WR was desulfurized, and a large number of active groups was grafted on the WR particles.

Highlights

Published: 20 May 2021As a kind of high molecular polymer, rubber is widely used in tire products
Several works have been done on waste crumb rubber modified asphalt (WRMA) [9,10,11,12,13,14]
The morphology of the three kinds of WR was observed by scanning electron microscope (SEM) (QUANTA FEG 450 (FEI, Thermo Nicolet, WA, USA)

Summary

Introduction

Published: 20 May 2021As a kind of high molecular polymer, rubber is widely used in tire products. With the failure of rubber tires, these solid wastes put a lot of pressure on the environment [1,2]. Waste rubber tires have been used to produce more sustainable construction materials with thermophysical and energy harvesting purposes [3,4,5]. The waste rubber tires can be recycled and crushed into crumb to produce rubber powder modified asphalt for environment-friendly construction [8]. Several works have been done on waste crumb rubber modified asphalt (WRMA) [9,10,11,12,13,14]. It was proved that the addition of waste crumb rubber (WR) could improve the performance of asphalt, such as better rutting resistance [15,16,17], enhanced fatigue life [18,19], and moisture damage resistance [20]

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Conclusion