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Abstract

To improve the performance of asphalt pavement, this paper prepared waste rubber powder/lake asphalt composite modified asphalt and waste rubber powder/rock asphalt composite modified asphalt, respectively, the high-temperature and low-temperature rheological properties of the composite modified asphalt were studied by dynamic shear rheometer and bending beam rheology test, and the modification mechanism of the composite modified asphalt was analyzed in combination with the infrared spectroscopy test method. The research results show that compared with matrix asphalt, the complex modulus of the two composite modified asphalts, namely rubber powder/lake asphalt and rubber powder/rock asphalt at 62 °C has increased by 423.0% and 562.6%, respectively. Meanwhile, waste rubber powder can reduce or even eliminate the adverse effects of natural asphalt on low-temperature performance. By taking the composite modified asphalt of rubber powder/lake asphalt as an example, under the test conditions of −12, −18, and −24 °C, the creep stiffness is reduced by 35%, 43%, and 36%, respectively compared with the matrix asphalt. Among the two types of composite modified asphalts, waste rubber powder and natural asphalt mainly play a physical filling role.

Publication Date

6-18-2022

DOI

10.14048/j.issn.1671-2579.2022.03.039

First Page

219

Last Page

224

Submission Date

May 2025

Reference

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