Performance changes of hot recycled asphalt mixture in different layers under coupling of multiple aging factors

Zhang, Zhuang; Han, Sen; Han, Xiao; Dong, Shihao; Yao, Tengfei

doi:10.1016/j.conbuildmat.2020.121343

Cited by 14 publications

(6 citation statements)

References 23 publications

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“…Because the coupling impact of freeze-thaw cycles and asphalt aging needs to be considered and the effect of basalt fiber content on it is not apparent, the number of freeze-thaw cycles (Badeli et al, 2018;Nian et al, 2018b), aging time (Sirin et al, 2019;Zhang, Z. et al, 2021), and basalt fiber content will have an obvious effect on the asphalt (Guo et al, 2020;Wang et al, 2018). Since the performance index of asphalt involves multiple independent variables, the data are complex, and there are many influencing factors.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Pavement Performance of Basalt Fiber-Reinforced Asphalt Mixture Under the Coupling Effect of Freeze-Thaw Cycles and Aging

Liang

Luo

2022

Front. Mater.

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Due to the significant temperature difference and high solar radiation in high-altitude areas, the asphalt pavement has been in freeze-thaw cycles and radiation service conditions for a long time, resulting in a shorter service life. To extend the service life of asphalt pavement in high-altitude areas, this study uses basalt fiber to toughen the asphalt mixture, and the service characteristics of the asphalt pavement under the coupled effects of freeze-thaw cycles and aging were evaluated. First, the freeze-thaw cycles, aging time, and basalt fiber content were selected as independent variables to conduct the Box–Behnken design (BBD) test design. Consequently, the corresponding response surface model was established. Based on the rutting test, three-point bending test, and indirect tensile test, the optimum content of basalt fiber was obtained. Finally, the fatigue properties of the asphalt mixture by the four-point bending fatigue test were compared under the optimum content. The results showed the consequences of freeze-thaw cycles will reduce the road properties of asphalt and give rise to damage to the asphalt; among them, the indirect tensile strength was decreased by 21.7% at most (the number of freeze-thaw cycles from 10 to 30). Aging will reduce the fatigue life of the asphalt mixture, but its dynamic stability, flexural tensile strength, and slitting strength will be enhanced to a certain extent; among them, the dynamic stability can be improved by up to 28.1% (aging from 4 to 12 h). Basalt fiber can increase the flexural tensile strength, dynamic stability, and spitting strength; the optimum content is 0.35% of asphalt mixtures. Furthermore, the fatigue life of basalt fiber-reinforced asphalt mixture can be significantly improved, which can reduce the influence of freeze-thaw cycles and aging. In addition, the unit price of basalt fiber-reinforced asphalt mixture is only 6.9% higher than that of SBS-modified asphalt mixture, which has significant economic benefits. Under experimental conditions, the effect of aging on the properties of the asphalt mixture is greater than that of the freeze-thaw cycle. This research shows that careful consideration of the road behavior of basalt fiber-reinforced asphalt mixture under freeze-thaw cycles and aging is essential for the pavement durability design.

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Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Pavement Performance of Basalt Fiber-Reinforced Asphalt Mixture Under the Coupling Effect of Freeze-Thaw Cycles and Aging

Liang

Luo

2022

Front. Mater.

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“…The fractions of saturates, aromatics, resins, and asphaltenes (SARA) are modified when aromatics decrease and asphaltenes increase over time [12]. Upon being exposed to water, heat, and ultraviolet (UV) rays during its lifespan, the asphalt succumbs to ageing that affects its pavement performance [13]. In fact, asphalt ageing is generally divided into short-term ageing (STA) and long-term ageing (LTA); the STA process includes transporting, mixing, paving, and rolling of asphalt.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, asphalt ageing is generally divided into short-term ageing (STA) and long-term ageing (LTA); the STA process includes transporting, mixing, paving, and rolling of asphalt. Asphalt becomes aged and hardened when its light components turn volatile due to high temperature [13]. Asphalt ageing leads to poor workability, cohesiveness, fatigue resistance, as well as fatigue and thermal cracking.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

et al. 2021

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Reclaimed asphalt pavement (RAP) has received much attention recently due to its increased use in hot mix asphalt (HMA) pavements to enhance pavement sustainability. The use of aged asphalt in RAP, which is highly oxidised and has lost its properties due to exposure to traffic loads and climatic conditions throughout its lifespan, can cause asphalt mixtures to stiffen and embrittle, thus negatively affecting the behaviour of asphalt mixtures. This issue may be resolved by including rejuvenating agents that can restore both physical and rheological properties of aged asphalt by increasing maltene fractions and decreasing asphaltene. However, the high restoration capacity of any kind of rejuvenating agent does not assure the durability of restored aged asphalt. This study explored the performance and durability of rejuvenated asphalt mixtures embedded with several types of rejuvenators identified from the extensive literature review. The study serves as a significant reference to predict future challenges in rejuvenating aged asphalt.

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“…Huang Qibo [ 31 ] studied the components of recycled asphalt mixture regenerant. Zhang Zhuang [ 32 ] found that the regenerant mixed with a viscosity reducer can effectively improve the low-temperature cracking resistance of aged asphalt, and the high-temperature rutting resistance can also fulfill the standard. Haddadi Sogol Sadat [ 33 ] found that the regenerant did not chemically react with the old asphalt.…”

Section: Introductionmentioning

confidence: 99%

Research Hotspots and Development Trends on Recycled Construction Materials in Pavement Engineering: A Bibliometric Evaluation

et al. 2021

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Road recycling technology is gradually becoming a research focus in road construction due to natural resource shortages. It is therefore necessary to carry out deep and extensive analysis of the huge amount of publications in the research area of recycling technology in road construction. Based on three databases (Web of Science, Compendex and Scopus) and VOSviewer visualization software, this study conducts a bibliometric analysis of the literature in the field of recycled construction materials in pavement engineering. The global research publications were reviewed to quantitatively identify the literature characteristics. A number of publications, document types, research areas and keywords were used to achieve the general statistics of this reviewed literature. H-index, publication number and citations per publication were used to evaluate the academic contributions by country, institution and journal. The results show that the most productive country and institution for publications are the USA and Chang’an University from China, respectively, followed by China and Wuhan University of Technology. In recent years, researchers have generally paid attention to two main approaches: the application of rubber modified asphalt and the performance enhancement of recycled pavement.

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Performance changes of hot recycled asphalt mixture in different layers under coupling of multiple aging factors

Cited by 14 publications

References 23 publications

Laboratory Investigation on Pavement Performance of Basalt Fiber-Reinforced Asphalt Mixture Under the Coupling Effect of Freeze-Thaw Cycles and Aging

Laboratory Investigation on Pavement Performance of Basalt Fiber-Reinforced Asphalt Mixture Under the Coupling Effect of Freeze-Thaw Cycles and Aging

A Review on the Durability of Recycled Asphalt Mixtures Embraced with Rejuvenators

Research Hotspots and Development Trends on Recycled Construction Materials in Pavement Engineering: A Bibliometric Evaluation

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