Performance grades, environmental and economic investigations of reclaimed asphalt pavement materials

Xiao, Feipeng; Su, Ningyi; Yao, Shenglei; Amirkhanian, Serji; Wang, Jingang

doi:10.1016/j.jclepro.2018.11.126

Cited by 83 publications

(12 citation statements)

References 26 publications

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“…Kim et al [15] tested dynamic modulus and repeated loads of cold recycling mixture and found that performance characteristics of recycling mixture were influenced by its asphalt content, temperature, and loads. Xiao et al [16] discussed high-and low-temperature performance grades, energy consumption, and greenhouse gas emission of recycled asphalt mixture. They indicated that the content of aging binder in recycling asphalt mixture could affect energy consumption, greenhouse gas emission, and cost reduction.…”

Section: State Of the Artmentioning

confidence: 99%

Post-Evaluation System of Cold Central-Plant Recycling Technology for Old Asphalt Pavement

Jing¹,

Song²,

Ye³

et al. 2019

JESTR

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Cold central-plant recycling (CCPR) is a technical method for the repair and maintenance of old asphalt pavement. However, this method lacks a complete evaluation system. In this study, various influencing factors were investigated and analyzed to establish a comprehensive and systematic evaluation system for CCPR pavement. A full-life staged evaluation system for CCPR pavement was established from perspectives of old pavement investigation and design, construction technology, management, and pavement performance and benefits. This evaluation system covered 5 level-1 indexes, 19 level-2 indexes, and 30 level-3 indexes, which were introduced in the present study. Weights of different indexes were determined by combining various evaluation methods, such as improved analytic hierarchy process and fuzzy comprehensive evaluation, and mutual influences of indexes. The CCPR pavement was evaluated based on the G316 repair and maintenance projects in Hanzhong of Shaanxi Province of China in 2017. Results demonstrate that the performance and benefits of CCPR pavement have the highest weight. Three level-1 indexes, namely, old pavement investigation and design, construction technology, and pavement performance, are evaluated to be good, while benefits and management are excellent. The overall evaluation score is 84.8, and the overall grade is good. The evaluation results conform to practical engineering situations. The proposed evaluation system can provide references to evaluate CCPR pavement.

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Section: State Of the Artmentioning

confidence: 99%

Post-Evaluation System of Cold Central-Plant Recycling Technology for Old Asphalt Pavement

Jing¹,

Song²,

Ye³

et al. 2019

JESTR

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show abstract

“…Another advantage of using RAP is that it helps to reduce the amount of expensive new asphalt binders used in asphalt paving mixes. Xiao et al [10] revealed that more than 100 million tons of RAP was collected for reuse in the United States, thereby saving about 61.4 million cubic yards of landfill space. The use of reclaimed asphalt pavement becomes attractive because of its effectiveness in terms of reducing costs and preserving the environment.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and Environmental Assessment of Asphalt Mixture Modified with a Compound of Reclaimed Asphalt Pavement and Waste Polyethylene

Boarie,

Abdelsalam,

Gamal

et al. 2024

Buildings

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The use of reclaimed asphalt pavement (RAP) in manufacturing asphalt concrete has become indispensable all over the world. This is due to the limited number of areas that are required to stockpile scraped pavement, as well as a lack of natural aggregate, which is necessary in manufacturing asphalt concrete. Thus, this research aims to evaluate the mechanical characteristics and environmental impact of using RAP and waste polyethylene in hot mix asphalt (HMA). RAP was added to hot mix asphalt in proportions of 25%, 50%, 75%, and 100% instead of the same amount of coarse aggregate. Then, the optimum RAP hot mix asphalt was modified by adding polyethylene in proportions of 1%, 2%, 3%, and 4% into the hot mix asphalt. The Marshall mix design was used to define the optimum asphalt content. As a final point in this experimental work, tests on the loss of stability, indirect tensile strength, and wheel loading tracking were performed to assess the performance of asphalt mixes modified with RAP and polyethylene in different conditions. A life cycle assessment (LCA) was applied using the ReCipe 2016 Endpoint method to evaluate the environmental impacts of these mixtures using the SimaPro software, V9.1. The laboratory tests showed that the mixture containing 50% RAP instead of the same amount of coarse aggregate and 2% polyethylene recorded better Marshall characteristics than the control mixture and the mixture with RAP alone. Finally, the modified hot mix asphalt with added RAP and polyethylene not only achieved superior performance in rutting, water damage resistance, and the stiffness modulus of bituminous mixtures, but it has been verified that there is no serious risk to the environment.

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“…The variability of RAP materials seriously affects the stability of the performance of hot recycled asphalt mixtures [21], which is one of the main reasons for limiting the maximum addition ratio of RAP. Montañez [22] found that there is significant variability in the mechanical response and performance of the evaluated RAPs, suggesting the necessity of taking into account the variability of RAP when fabricating asphalt mixtures with RAP obtained from different sources.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Refined Separation on the Properties of Reclaimed Asphalt Pavement Materials

Wang,

Dou,

Wang

et al. 2024

Buildings

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Refined separation not only controls the variability of reclaimed asphalt pavement (RAP), but also improves the mixing ratio of RAP and the quality of recycled asphalt mixtures. This study examines RAP treated with various refined separation frequency parameters, analyzes the variation rules and the variability of RAP aggregate gradation, asphalt content, asphalt properties, and aggregate properties, and calculates the maximum mixing percentage of coarse RAP material by using the gradation variability control method and the asphalt content variability control method. The results show that the variability of gradation and asphalt content of coarsely separated RAP is considerable, and a refined separation process significantly reduces the variability of gradation and asphalt content of RAP; the agglomeration of RAP decreases with an increase in the refined separation frequency; and the RAP agglomeration of three kinds of RAPs (E1, E2, and E3) under a refined separation frequency of 55 Hz reduces by 6.40%, 4.30%, and 4.30%, respectively, as compared with that of coarsely separated RAPs. The asphalt content of the refined separation RAP gradually decreases with an increase in frequency, and the asphalt content of E1 and E2 (55 Hz) was only 0.95% and 1.10%, respectively. The maximum percentage of RAP in recycled asphalt mixtures was calculated using the gradation variability control method and the asphalt content variability control method, respectively. The maximum proportions of RAP were 45% and 33% for A1 (0 Hz), respectively, and the maximum proportions of RAP for E1 (55 Hz) were all 100%. The results of the two methods show that the process of refined separation can increase the maximum proportion of blended RAP materials. They also demonstrate that the refined separation process can increase the maximum blending ratio of coarse RAP materials, thereby improving the quality of the RAP, increasing the proportion of RAP blending, and ensuring the quality of the recycled asphalt mixture. In conclusion, the refined separation process holds promise for maximizing the potential value of RAP and optimizing its recycling, environmental, and economic benefits.

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Performance grades, environmental and economic investigations of reclaimed asphalt pavement materials

Cited by 83 publications

References 26 publications

Post-Evaluation System of Cold Central-Plant Recycling Technology for Old Asphalt Pavement

Post-Evaluation System of Cold Central-Plant Recycling Technology for Old Asphalt Pavement

Laboratory and Environmental Assessment of Asphalt Mixture Modified with a Compound of Reclaimed Asphalt Pavement and Waste Polyethylene

The Effect of Refined Separation on the Properties of Reclaimed Asphalt Pavement Materials

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