Comprehensive Performance Evaluation and Cost Analysis of SBS-Modified Bioasphalt Binders and Mixtures

Document Type

Article

Publication Date

9-22-2017

Department

Department of Civil, Environmental, and Geospatial Engineering

Abstract

Developing new sustainable materials such as bioasphalt has become a research trend in recent years. In this study, bioasphalt modified with the addition of styrene-butadiene-styrene (SBS) was investigated to research whether it can replace petroleum asphalt binder of 50 penetration grade (50#) in road performance at a lower price. A series of laboratory tests were carried out to evaluate the performance of SBS-modified bioasphalt binders and mixtures, including penetration, softening point, ductility, rutting, moisture susceptibility, and low-temperature cracking. The SBS-modified bioasphalt was prepared with different of bio-oil content: 0, 5, 10, 15, and 20%. Moreover, a comprehensive evaluation was applied to all types of asphalt and a recommended selection of asphalts was provided. The research showed that the performance of SBS-modified bioasphalt could satisfy the specification requirements of 50# base binder when bio-oil concentration was less than 15%. The high-temperature stability of SBS bioasphalt mixture was worse than that of the 50# base binder mixture to some degree, but could still satisfy the specification requirements. The SBS-modified bioasphalt mixture had better thermal crack resistance and water stability than the 50# base binder mixture, and it had better adhesion at low temperatures, reaching its maximum adhesion value with an aggregate loss of 4.33% when the bio-oil content was 10%. The SBS-modified bioasphalt with 10% bio-oil (S110) is thus recommended according to the performance evaluation and cost analysis. Furthermore, from the standpoint of environmental protection and economic benefits, S110 has good development prospects.

Publication Title

Journal of Materials in Civil Engineering

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