Evaluation on the mechanical performance of recycled asphalt mixtures incorporated with high percentage of RAP and self-developed rejuvenators

Zhang, Jizhe; Guo, Chenchen; Chen, Tingting; Zhang, Wenwu; Yao, Kai; Fan, Chao; Liang, Ming; Guo, Chunhui; Yao, Zhenqiang

doi:10.1016/j.conbuildmat.2020.121337

Cited by 54 publications

(13 citation statements)

References 32 publications

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“…This means that HMA mixtures with RAP materials (C30-C50) have lower fatigue lives at the strain levels below 800 le as compared to the control mixture (C), whereas the fatigue lives of these mixtures are higher than the control mixture at the strain level of 800 le. Zhang et al [3] also reported the lower fatigue life of mixtures with RAP materials at the strain level of 100 le. In another study conducted by Bharath et al [41], it was reported that the addition of RAP materials leads to a decrease in the fatigue life of asphalt mixtures, according to the results of indirect tensile fatigue test in the stresscontrolled mode.…”

Section: Four-point Beam Fatigue Test Resultsmentioning

confidence: 94%

“…The recycling of reclaimed asphalt pavement (RAP) has contributed to lessening the environmental and economic problems associated with the construction or rehabilitation of asphalt pavements with solely virgin materials [1,2]. It was found by researchers that due to the fact that the addition of RAP materials into asphalt mixtures increases the stiffness, the rutting resistance of mixtures with RAP materials is higher than the reference mixture [3]. In addition, due to the strong bonding between aggregates and asphalt binder in highly aged RAP materials, asphalt mixtures with RAP materials have better resistance against moisture damages [4].…”

Section: Introductionmentioning

confidence: 99%

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Experimental assessment and modeling of fracture and fatigue resistance of aged stone matrix asphalt (SMA) mixtures containing RAP materials and warm-mix additive using ANFIS method

et al. 2021

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In this research, the fracture and fatigue resistance of short and long-term aged hot and warm mix (HMA and WMA) stone matrix asphalt (SMA) mixtures containing 0%, 30%, 40%, and 50% RAP materials were investigated using semi-circular bending (SCB) and four-point beam fatigue (4 PB) test methods. It is further noted that three temperatures (-20 °C, 0 °C, and 20 °C) were considered for the SCB test to take the viscoelastic behavior of asphalt mixtures into account. The adaptive neuro-fuzzy interface system (ANFIS) method was utilized to model the fracture and fatigue parameters obtained from each test so as to cut back on the time and cost for conducting the tests. The results indicated that the incorporation of RAP materials into HMA mixtures decreased the fatigue life and fracture resistance as compared to the control mixture at lower temperatures, even though an increase in the fracture resistance was observed at the intermediate temperature. It is further noted that the addition of WMA additive into SMA mixtures containing 50% RAP materials resulted in a better fracture resistance as compared to the control mixture. However, the WMA additive incorporation led to shorter fatigue lives as compared to the corresponding HMA mixtures. Moreover, although long-term aging reduced the fracture resistance of HMA mixtures, its application resulted in a better fracture resistance in WMA mixtures. Also, long-term aging had a less adverse effect on the fatigue life of WMA mixtures as compared to HMA mixtures. It was also observed that the ANFIS model could estimate the fracture and fatigue parameters with great precision.

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Section: Four-point Beam Fatigue Test Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Experimental assessment and modeling of fracture and fatigue resistance of aged stone matrix asphalt (SMA) mixtures containing RAP materials and warm-mix additive using ANFIS method

et al. 2021

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“…The creep slope and stripping slop represent the deformation rate of RAM in rutting deformation and moisture damage, and larger values imply higher possibility of rutting destruction and moisture damage. The stripping inflection point (SIP), as a shift point from creep process to stripping process, its presence means the beginning of asphalt film peeling off from the surface of the aggregate [ 16 ]. As shown in Figure 10 , all steel slag RAM do not reach the SIP.…”

Section: Resultsmentioning

confidence: 99%

“…Roja et al illustrated that the asphalt mixture with 35% RAP content revealed the highest dynamic modulus the least fracture resistance [ 15 ]. Zhang et al found that the recycled asphalt mixture had a lower fatigue life than new asphalt mixture and the gap was enlarged with the ascending RAP content [ 16 ]. Some approaches to characterize and classify the RAP were applied to promote its popularization and utilization [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Quantitative Assessment of Road Performance of Recycled Asphalt Mixtures Incorporated with Steel Slag

Wang

Yang

et al. 2022

Materials

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Circular utilization of reclaimed asphalt pavement (RAP) has received extensive attention for its economic and environmental benefits. The application of recycled asphalt mixtures (RAM) in the upper layer of asphalt pavement faces the issue of inferior anti-slip performance and durability. This study aims to recycle steel slag as virgin aggregates in RAM and quantitatively evaluate the service performance of RAM with steel slag. Steel slag and basalt RAM were firstly fabricated and the five different RAP contents were involved. Then tests of Marshall stability, indirect tensile strength and Cantabro spatter loss were conducted to investigate the moisture susceptibility of RAM. Moreover, their high temperature stability, crack resistance and skid resistance were characterized. Indirect tensile fatigue test combined with Hamburg wheel tracking test were carried out to discuss the durability of RAM. The comprehensive performance of RAM with steel slag were quantitatively assessed based on an improved radar chart evaluation method. The results show that involving steel slag reveals a remarkable enhancement function on water stability, high and low temperature performance, skid resistance and fatigue resistance of RAM. Steel slag RAM with 50% RAP content demonstrates a rutting depth of 7.60 mm and a creep slope of 2.54 × 10−4, indicating its superior durability in high temperature and water environment. Compared with the comprehensive evaluation function of 0.5336 for basalt RAM with 30% RAP dosage, steel slag RAM reaches 0.7801, which represents its preferable road performance.

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“…It was found that the increase in RAP content (0–100%) significantly influenced the properties of recycled asphalt mixtures [ 13 ]. The annual production of RAP in China can reach up to 220 million tons, for which the relative low utilization rate is far from enough to meet the needs of waste recycling and landfill space reduction [ 14 ]. It is a urgent demand and great challenge to design the asphalt mixtures with a high RAP content and evaluate their performance in the result of an increment in the stiffness of aged asphalt binder [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

Wei

Zhu

et al. 2021

Materials

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Recycling of reclaimed asphalt pavement (RAP) has gradually emerged as a hot topic in the current research of building materials. Manufacturing the recycled asphalt mixture with a high RAP content still remains a major challenge due to the problem of inferior water damage resistance and fatigue cracking resistance. The aim of this study is to evaluate the servicing performance of recycled asphalt mixture with high percentage of RAP and assess its environmental impact on volatile organic compounds (VOCs) emission. To further explore the intrinsic factor on the performance of a recycled asphalt mixture, the mixed asphalt binder with a different content of extracted RAP binder was firstly investigated. The results show that the larger the content of RAP binder, the lower the mechanical indexes and VOCs emission. There exists an internal relationship between the chemical composition and VOCs release behavior with the variation of the recycled asphalt binder content. Based on the results of mixed recycled asphalt binder, the road servicing performance of a rather high utilization of RAP (i.e., 50%, 60%, and 70%) was assessed. It was found that the reuse of RAP aggregates has little influence on the volume performance of recycled asphalt mixture, and servicing performances still meet the construction requirements in spite of a descending trend. Moreover, a significant reduction effect on VOCs emission was found in the mixing stage of recycled asphalt mixture, indicating that the VOCs emission can be decreased by 94.82% when the content of RAP aggregates increases to 70%. The recycling of RAP with a high content contributes to the sustainable development of road engineering and the construction of green pavements.

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Evaluation on the mechanical performance of recycled asphalt mixtures incorporated with high percentage of RAP and self-developed rejuvenators

Cited by 54 publications

References 32 publications

Experimental assessment and modeling of fracture and fatigue resistance of aged stone matrix asphalt (SMA) mixtures containing RAP materials and warm-mix additive using ANFIS method

Experimental assessment and modeling of fracture and fatigue resistance of aged stone matrix asphalt (SMA) mixtures containing RAP materials and warm-mix additive using ANFIS method

Quantitative Assessment of Road Performance of Recycled Asphalt Mixtures Incorporated with Steel Slag

Environmental Impact on VOCs Emission of a Recycled Asphalt Mixture with a High Percentage of RAP

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