Laboratory Evaluation of Physical and Mechanical Properties of Recycled Asphalt Pavement

Thakur, Subhash C.; Han, Jie; Chong, Wai Kiong; Parsons, Robert L.

doi:10.1061/41104(377)31

Cited by 9 publications

(5 citation statements)

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“…The optimum wetness levels and maximum dry consistency of both RAPs were found to be 3.22% and 1.78 g/cm3, respectively. In both cases, RAPs had abrasion values of 38% and CBR values of 18% and 14%, respectively [25]. Address the possibility of employing construction debris from building and demolition used to build roads in Egypt.…”

Section: Propertiesmentioning

confidence: 99%

Comprehensive Review on Utilization of Construction Demolished Waste and Crumb Rubber for Sustainable Pavement Construction

Harinder,

Srujana,

Jai Charan Reddy

et al. 2024

J. Phys.: Conf. Ser.

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Several researchers are focusing on the utilization of Construction Demolished Waste (CDW) and Crumb Rubber (CR). They assess CDW’s acoustic, workability, durability, and mechanical properties. Numerous studies are addressing the benefits of using Crumb Rubber in various applications. Research has also shown that various fiber materials can be utilized to boost the strength of concrete. Some examples of typical fiber material are basalt, steel, glass, and polypropylene fibers. But the studies do not address the combination of CDW and CR with other fibers. This article discusses the state-of-the-art in CDW and CR properties with the respective combinations of fiber materials used in pavement engineering. Additionally, the literature review has been completely revised to understand the structural arrangement and material composition of particles for further research in the future.

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Section: Propertiesmentioning

confidence: 99%

Comprehensive Review on Utilization of Construction Demolished Waste and Crumb Rubber for Sustainable Pavement Construction

Harinder,

Srujana,

Jai Charan Reddy

et al. 2024

J. Phys.: Conf. Ser.

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“…Although the requirements of the major U.S. states (Thakur, 2010) on the proportion of old material blending are different, the blending rate is roughly 10-50%, and the survey found that most of the asphalt pavement maintained by plant mix hot regeneration technology has a better road performance to meet the requirements of use. In the United States, the plant mix hot regeneration maintenance and repair technology is mainly used in road and airport runway paving (Kandhal et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Effects of RAP Proportions on the Pavement Performance of Recycled Asphalt Mixtures

Wang

2022

Front. Mater.

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In-plant hot mix recycling technology has been widely used in maintenance and reconstruction due to its good recycling performance. However, the utilization rate of recycled asphalt pavement (RAP) is still only 10–25%, resulting in excessive accumulation and landfilling of RAP materials, which fails to promote the sustainable value of RAP in recycling. Therefore, this paper comprehensively explores the pavement performance of AC-20 ordinary asphalt recycled mixture and AC-13 modified asphalt recycled mixture with different proportions of RAP. The pavement performance test includes the dynamic modulus, rutting, dynamic creep, semicircular bending, and freeze-thaw splitting tests. The results show that, with the increase of RAP content, the mechanical properties and high-temperature properties of the two types of recycled asphalt mixtures are improved, the low temperature properties and moisture susceptibility properties are enhanced first and then weakened, and the best performance is reached when RAP content is 20 and 40%, respectively. According to the entire pavement performance test results, the influence of RAP content on AC-13 recycled modified asphalt mixtures is relatively smaller than that of AC-20 normal recycled asphalt mixtures. The addition of rejuvenator can improve the low-temperature performance and moisture susceptibility of recycled asphalt mixtures to a certain extent, especially for AC-20 ordinary recycled asphalt mixture. Consequently, it is suggested to use AC-13 recycled modified asphalt mixture in the upper layer of road; the RAP content can reach 20%, and rejuvenator can be used to improve its moisture susceptibility and low-temperature performance. AC-20 ordinary recycled asphalt mixture can be used in the middle surface layer, and the RAP content can reach 40%, or using AC-13 recycled modified asphalt mixture, the RAP content can reach 50%.

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“…Bennert et al ( 6 ) found that natural aggregates had higher shear strength than pure RAP mixes. Thakur et al ( 5 ) found a decrease in CBR values in RAP with increasing binder content and decreasing fines content. Bleakley and Cosentino ( 12 ) found that the limerock bearing ratio (LBR), a variation of the CBR test, for RAP fell short of acceptable limits; the researchers found that strength issues can be mitigated by using RAP blended with natural aggregates or by means of chemical stabilization.…”

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confidence: 99%

“…Over 100 million tons of RAP are milled annually in the United States ( 4 ). The amount of RAP produced often exceeds the amount that can feasibly be reused for hot mix asphalt (HMA) mixes ( 5 ). Excess RAP generated on site can be utilized near the site as a base course material, thus reducing material transportation costs.…”

mentioning

confidence: 99%

“…Fine RAP particles tend to be coated with hydrophobic asphalt, which reduces the ability to hold excess moisture ( 9, 10 ). Nokkaew et al ( 11 ) found the saturated hydraulic conductivity values for RAP range between 3.7 × 10 −5 m/s and 3.7 × 10 −4 m/s, when compacted to 95% of maximum dry density. As asphalt is a viscoelastic binding agent, RAP tends to show deformation over time under sustained stresses (creep), and numerous studies have shown that pavements with RAP base courses are susceptible to rutting ( 4, 12 ).…”

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confidence: 99%

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Long-Term Performance of Flexible Pavements Constructed on Recycled Base Layers

Titi

Qamhia

Ramirez

et al. 2022

Transportation Research Record: Journal of the Transportation R

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There has been an increased interest in using reclaimed asphalt pavement (RAP) aggregates as a base course in Wisconsin for the offered economic and environmental benefits. Laboratory studies showed that RAP can have resilient modulus values higher than typical natural aggregates, and can also have higher durability, especially in freeze–thaw cycles. However, it is also recognized that RAP exhibits temperature sensitivity and larger permanent deformations than natural aggregates. How these characteristics manifest themselves in the northern U.S. climates can only be assessed by long-term observation of field performance. Wisconsin Department of Transportation (WisDOT) has been using RAP as a base course for over 30 years. The qualitative assessment of WisDOT roads constructed with RAP showed they are performing adequately. However, this impression has not yet been verified quantitatively. This paper presents a quantitative assessment and comparisons for field performance of pavement test sections constructed with RAP and natural crushed aggregate (CA) base course layers in Wisconsin. The performance was evaluated using pavement distress surveys of roadways containing RAP and CA, falling weight deflectometer (FWD), dynamic cone penetrometer (DCP) tests, and analysis of WisDOT’s available data. Based on the field evaluation, the performance of the hot mix asphalt (HMA) pavements with RAP was found adequate and comparable to those with CA base course layers. A recommendation was given that WisDOT shall continue the practice of using RAP in base course layers of HMA pavements, given proper quality checks for materials, and proper quality control/quality assurance measures being applied during construction.

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Laboratory Evaluation of Physical and Mechanical Properties of Recycled Asphalt Pavement

Cited by 9 publications

References 0 publications

Comprehensive Review on Utilization of Construction Demolished Waste and Crumb Rubber for Sustainable Pavement Construction

Comprehensive Review on Utilization of Construction Demolished Waste and Crumb Rubber for Sustainable Pavement Construction

Investigation on the Effects of RAP Proportions on the Pavement Performance of Recycled Asphalt Mixtures

Long-Term Performance of Flexible Pavements Constructed on Recycled Base Layers

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