Laboratory evaluation of foamed asphalt mixtures with 100% RAP and rejuvenator

Jeong, M. Myung; Kim, Sungun; Shen, Junan

doi:10.1080/14488353.2020.1794329

Cited by 2 publications

(1 citation statement)

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“…The results showed that when the compaction temperature was 115 • C, the rutting depth of FWMA-B was reduced by 0.3 mm compared to that of FWMA-A after 20,000 cycles. Jeong, M. M. [37] and others analyzed the effect of a rejuvenator on foam asphalt mixtures containing 100% RAP. They found that adding a 6% rejuvenator improves its resistance to cracking but significantly decreases its structural integrity.…”

Section: Introductionmentioning

confidence: 99%

Compaction Characteristics of a Foam Asphalt Hot In-Place Recycling Asphalt Mixture

Sun,

Guo,

et al. 2023

Buildings

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This study investigates the application of foam asphalt (FA) to enhance the compaction effectiveness of a hot in-place recycling asphalt mixture (HIR-AM) during the HIR process of old road surfaces. Initially, the process parameters for FA preparation were determined through expansion-rate and half-life tests. Subsequently, the study focused on evaluating the impact of FA on the compaction quality of HIR-AM. Performance assessments were conducted through rutting tests, low-temperature bending tests, Hamburg wheel tracking tests, dynamic modulus analyses, and various other experiments to evaluate the road performance of HIR-FAM. Finally, the research findings were validated through practical engineering applications, and the construction process for HIR-FAM was summarized. The research results reveal that the optimal foaming temperature for SBS asphalt is 170 °C, with an ideal water content of 1.7%. Under the same compaction temperature, HIR-FAM demonstrated a significant reduction in void content, ranging from 3.8% to 21.2% compared to HIR-AM. Moreover, a higher proportion of FA usage resulted in a more substantial decrease in void content. Compared to HIR-AM, HIR-FAM exhibited notable improvements, including an 11.6% increase in dynamic stability, a 13.4% enhancement in bending strength, a 13.3% increase in maximum bending strain, an 8.1% improvement in residual stability, and an 8.5% boost in freeze–thaw splitting strength. Furthermore, HIR-FAM demonstrated superior water-thermal stability and resistance to low-frequency loads. Paving a test road verified that the adoption of foam asphalt in thermal recycling led to a compaction density increase of over 0.79% compared to traditional in situ thermal recycling sections, with improved compaction uniformity.

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Section: Introductionmentioning

confidence: 99%