Exploration of the design theory of crack-resistant rejuvenator for warm-mix recycled asphalt mixtures with high RAP contents

Pei, Zhongshi; Yi, Junyan; Meng, Xu; Ai, Xinman; Cao, Junyi; Hu, Wei; Gao, Libo; Feng, Decheng

doi:10.1016/j.jclepro.2023.135855

Cited by 16 publications

(2 citation statements)

References 44 publications

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“…When the proportion of RAP in the recycled mixture is high, it is necessary to add a regenerant to reactivate aged asphalt and restore its performance [9]. The degree of fusion of old asphalt after the addition of regenerant affects the modulus of recycled asphalt [10], and it is also necessary to determine the moduli of hot-recycled asphalt mixture, especially the dynamic modulus and bending stiffness modulus, which are key parameters in asphalt mixture design [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Chen¹,

Liu

Feng

et al. 2023

Materials

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Generally, the dynamic modulus and bending stiffness modulus are used to evaluate the mechanical properties of asphalt mixture, and they are also used as basic parameters for asphalt mixture design. Therefore, a study was conducted on changes in the dynamic modulus and bending stiffness modulus of hot-recycled asphalt mixture with high levels of reclaimed asphalt pavement (RAP) under the influence of different factors: dosage of regenerant, curing temperature, and curing time. The performance of reclaimed asphalt pavement (RAP) was first evaluated. Then, the hot-recycled asphalt mixture was adjusted and designed in order to conduct modulus experiments, composed of the dynamic modulus test and three-point bending test. Finally, the influencing factors were not only qualitatively but also quantitatively analyzed to clarify the change laws of the mechanical parameters of hot-recycled asphalt mixture. The results showed that the modulus of the recycled asphalt mixture first decreased, then increased, and then decreased with increasing dosage of regenerant. As the curing time or temperature increased, the modulus first decreased and then increased. In terms of the dynamic modulus of the hot-recycled asphalt mixture, the curing time had the greatest impact, followed by dosage of the regenerant and curing temperature. For bending stiffness modulus, the influence of dosage of the regenerant was the greatest, followed by curing time and curing temperature. For the bending stiffness modulus of hot-recycled asphalt mixture, the curing conditions had a greater influence compared with the dynamic modulus.

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Section: Introductionmentioning

confidence: 99%

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Chen¹,

Liu

Feng

et al. 2023

Materials

Self Cite

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“…The in situ Falling Weight Deflectometer (FWD) tests and laboratory tests on extracted cores conducted on Italian highways exhibit similar consequences [ 17 ]. However, the lower mixing temperatures used in the production of recycled asphalt mixtures make it difficult for the additives, especially the rejuvenator, to diffuse and interact with the aged asphalt [ 18 ]. The resistance to moisture damage and permanent deformation of asphalt mixtures may degrade equally because of the wet aggregates and the lack of electrochemical tendency between the binder and aggregate surface at low mixing temperatures [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Feasibility Analysis of Polyurethane-Prepolymer-Modified Bitumen Used for Fully Reclaimed Asphalt Pavement (FRAP)

Sun,

Wang,

Sun

et al. 2023

Materials

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Asphalt pavement recycling technology with high reclaimed asphalt pavement (RAP) content has always been limited by unsatisfactory pavement performance and the rising cost of pavement materials. To address these challenges, polyurethane-prepolymer-modified bitumen (PPB) was proposed to be utilized as the asphalt binder of fully reclaimed asphalt pavement (FRAP) in this study. The proper formula of the PPB binder was determined based on a range of tests. The rheological behavior and tensile properties of the PPB binder were then investigated, and the economic cost of materials was discussed as well. Results revealed that the PPB system can be obtained through chemical synthesis using readily available raw materials. The reaction of polyurethane prepolymer and chain extender provides PPB with significant improvement in temperature susceptibility, rutting resistance, and tensile properties. It is also demonstrated in this study that the PPB mixture containing 100% RAP, on the whole, takes advantage of cost-saving especially compared to the epoxy asphalt mixture. Therefore, the PPB binder exhibits a favorable application prospect in FRAP.

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Prediction and evaluation the moisture damage resistance of rejuvenated asphalt mixtures based on neural network

Luo

Guo

Gao

et al. 2023

Construction and Building Materials

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Exploration of the design theory of crack-resistant rejuvenator for warm-mix recycled asphalt mixtures with high RAP contents

Cited by 16 publications

References 44 publications

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Feasibility Analysis of Polyurethane-Prepolymer-Modified Bitumen Used for Fully Reclaimed Asphalt Pavement (FRAP)

Prediction and evaluation the moisture damage resistance of rejuvenated asphalt mixtures based on neural network

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