Optimizing rejuvenator content in asphalt concrete to enhance its durability

Espinoza-Luque, Arturo F.; Al‐Qadi, Imad L.; Özer, Hasan

doi:10.1016/j.conbuildmat.2018.05.256

Cited by 41 publications

(12 citation statements)

References 26 publications

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“…The increased stiffness associated with RAP (4) can accelerate cracking rates if not designed properly, which can deter producers and state agencies from increasing RAP allowances (1,5). Similar issues arise with the use of RAS, and even more careful consideration is needed because of the high binder content and very high stiffness associated with the binder contained in RAS (6)(7)(8)(9). Mixture performance testing can provide confidence when designing with these materials, especially in the case of high binder replacement levels.…”

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confidence: 99%

“…It appeared that virgin performance grade high-temperature (PGHT) drop or rejuvenator agent (RA) implementation could improve the cracking resistance. Researchers used four different dosages of a rejuvenator (0%, 3%, 6%, and 9% of binder weight) and tested plant-produced samples containing 14% RAP with two levels of aging, namely, unaged and short-term aged ( 6 ). Results from a semicircular bending (SCB) cracking test and Hamburg wheel track tests (HWTT) showed that with higher rejuvenator dosage, higher rutting and lower cracking was predicted.…”

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confidence: 99%

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Performance Evaluation of Asphalt Mixtures with Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Missouri

Jahangiri

Majidifard

Meister

et al. 2019

Transportation Research Record: Journal of the Transportation R

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This study investigates the performance of eighteen different dense-graded asphalt mixtures paved in Missouri. The sections contain a wide range of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), and different types of additives. The large number of sections investigated and the associated breadth of asphalt mixtures tested provided a robust data set to evaluate the range, repeatability, and relative values provided by modern mixture performance tests. As cracking is one of the most prevalent distresses in Missouri, performance tests such as the disk-shaped compact tension test (DC[T]) and Illinois flexibility index test (I-FIT) were used to evaluate the cracking potential of the sampled field cores. In addition, the Hamburg wheel tracking test (HWTT) was employed to assess rutting and stripping potential. Asphalt binder replacement (ABR) and binder grade bumping at low temperature were found to be critical factors in low-temperature cracking resistance as assessed by the DC(T) fracture energy test. Six sections were found to perform well in the DC(T) test, likely as a result of binder grade bumping (softer grade selection) or because of low recycling content. However, all of the sections were characterized as having brittle behavior by the I-FIT flexibility index. Service life and ABR were key factors in the I-FIT test. Finally, a performance-space diagram including DC(T) fracture energy and HWTT rut depth was used to identify mixtures with higher usable temperature interval (UTImix), some of which contained significant amounts of recycled material.

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confidence: 99%

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confidence: 99%

Performance Evaluation of Asphalt Mixtures with Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Missouri

Jahangiri

Majidifard

Meister

et al. 2019

Transportation Research Record: Journal of the Transportation R

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“…Safety, durability and construction efficiency of road infrastructure are the key objectives pursued by civil engineers and researchers [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…[54,55]. (2) Construction quality. The quality of asphalt pavement construction is affected by many factors, such as the temperature of mixing, paving and compaction, particle segregation, etc.…”

Section: Introductionmentioning

confidence: 99%

Design of a Novel Road Pavement Using Steel and Plastics to Enhance Performance, Durability and Construction Efficiency

et al. 2021

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Durability is one important problem that pavement engineers need to address in pavement’s long service life. Furthermore, easily recycled pavement materials, and safe and efficient pavement construction are also important areas for development in road engineering. For these reasons, a new asphalt steel plastic (ASP) pavement structure was proposed with an asphalt mixture forming the surface layer, and steel plate and plastic materials functioning as the main load-bearing layers. Based on a comprehensive performance review and cost-benefit analysis, stone mastic asphalt (SMA) is recommended to be used as the surface layer; and A656 steel plate and acrylonitrile butadiene styrene (ABS) plastic materials should be the main load-bearing layer, on top of a foundation layer made with graded crushed stones. A glass fiber reinforced polymer (GFRP) insulation layer is recommended for use between the steel plate and ABS. Mechanical properties of the ASP pavement were analyzed using the finite element method. Laboratory tests were conducted to verify the thermal insulation performance of GFRP, the high-temperature stability and the fatigue resistance of ASP pavement. Results show that some of the mechanical properties of ASP pavement (with a structure of 80 mm SMA asphalt mixture, 8 mm steel plate, 140 mm ABS and 200 mm crushed stones) are comparable with conventional long-life pavement (with 350 mm asphalt layer overlaying 400 mm graded crushed stones). Dynamic stability of the ASP slab specimens can reach 10,000 times/mm, and the fatigue life is about twice that of SMA. Besides, the ASP pavement can be prefabricated and assembled on-site, and thus can greatly improve construction efficiency. From the lifecycle perspective, ASP pavement has many advantages over traditional pavements, such as durability, lower environmental footprint and recyclability, making it is worth further research.

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“…However, having and/or injecting an optimum amount of rejuvenator is one of the key aspects of achieving the desired material properties and enhanced performance characteristics [17]. Balanced rejuvenating design based on multicriteria evaluation has been used by many researchers to optimize the rutting, cracking, and fatigue performances of asphalt binders [18,19]. Koudelka et al [20] used two rheological parameters: the Glower-Rowe (G-R) parameter obtained from the dynamic shear rheometer (DSR) tests and the delta T c (ΔT c ) obtained from the bending beam rheometer (BBR) tests to determine the optimum dosages of recycling agents.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Physical and Rheological Properties of Rejuvenated Styrene‐Butadiene‐Styrene‐Modified Asphalt Binders

Chen

Wang

Zhang

et al. 2020

Advances in Materials Science and Engineering

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To evaluate the physical and rheological properties of rejuvenated styrene-butadiene-styrene-modified asphalt (SBSMA) binders designed for rapid in-place pavement recycling, an aged SBSMA binder was rejuvenated with three rejuvenators (i.e., Types I, II, and III) in different dosages. The physical properties of rejuvenated SBSMA were obtained to determine the optimal type and dosage of rejuvenators for the first and second rejuvenation. Performance grade (PG) tests, multiple stress creep recovery (MSCR) tests, and linear amplitude sweep (LAS) tests were conducted to measure the rheological properties using the dynamic shear rheometer (DSR) and bending beam rheometer (BBR). The results exhibited that the rejuvenators could soften the multiple aged binder and enhance its high- and low-temperature performance. The rejuvenation effect of rejuvenator Type I with the optimal dosage of 6∼8% was the most appropriate for the first rejuvenation. The optimal dosage of the second rejuvenation was 10∼12%. The addition of rejuvenators decreased the rutting factor G∗/sin δ, creep stiffness (S), delta Tc (ΔTc) parameter, recovery response (R), and yield stress of rejuvenated SBSMA. On the other hand, an increase in the rate of relaxation (m-value), nonrecoverable creep compliance (Jnr), and yield strain of rejuvenated SBSMA was recorded. Overall, the study findings indicated an improvement in the elastic properties of rejuvenated SBSMA, which contributes to improving the rutting, thermal, and fatigue cracking resistance of asphalt binder and ultimately the response of asphalt pavements.

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Optimizing rejuvenator content in asphalt concrete to enhance its durability

Cited by 41 publications

References 26 publications

Performance Evaluation of Asphalt Mixtures with Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Missouri

Performance Evaluation of Asphalt Mixtures with Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Missouri

Design of a Novel Road Pavement Using Steel and Plastics to Enhance Performance, Durability and Construction Efficiency

Evaluating the Physical and Rheological Properties of Rejuvenated Styrene‐Butadiene‐Styrene‐Modified Asphalt Binders

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