Effect of waste oil rejuvenators on hot in-place recycled SMA pavement
Source abstract
Abstract
Hot In-place Recycling (HIR) asphalt pavement often contains more than 90 % Reclaimed Asphalt Pavement (RAP), frequently leading to issues such as poor crack resistance and durability. Specifically, HIR of Stone Mastic Asphalt (HIR-SMA) often suffers from insufficient compaction, resulting in performance degradation . This study aims to explore rejuvenators derived from waste oil that can significantly enhance the performance of HIR-SMA. Five waste oil rejuvenators were selected, including Waste Soybean Oil (WSO), Palm Oil (PO), Epoxidized Soybean Oil (ESO), Tall Oil (TO), and Waste Engine Oil (WEO). Recycled asphalt lab samples were modified with five rejuvenators at various dosages and tested for asphalt basic properties, with differences analyzed using infrared spectroscopy . Furthermore, the compactability , fatigue resistance , crack resistance at medium and low temperatures, moisture stability, and rutting resistance of HIR-SMA were tested. Finally, the waste oil rejuvenators were applied in a highway maintenance project in Jiangxi Province, with the field construction effectiveness assessed through a non-nuclear asphalt density gauge. The results show that WSO, PO, and ESO rejuvenators exhibit better rejuvenation effects compared to TO and WEO, restoring aged asphalt performance close to virgin asphalt. This is primarily attributed to their high ester content . The addition of rejuvenators effectively reducing the compaction energy required and enhancing compactibility of HIR-SMA. Additionally, WSO rejuvenated mixtures demonstrated a fourfold increase in fatigue life and improved crack resistance at medium temperatures by 9–15 %, albeit with reduced low-temperature crack resistance by 13–30 %. The addition, both waste oils also decreased rutting and moisture stability but remained within acceptable limits. At last, field construction measurements of waste oil-rejuvenated SMA by HIR indicated that WSO is more suitable for HIR construction.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Asphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Concrete and Cement Materials Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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