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A special issue of Buildings (ISSN 2075-5309). This special issue belongs to the section "Building Materials, and Repair & Renovation".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 20208

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Dr. Huayang Yu

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Guest Editor

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510000, China
Interests: pavement; smart road construction; green materials; binder; intelligent transportation
Special Issues, Collections and Topics in MDPI journals

Dr. Tao Wang

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Guest Editor

School of Civil Engineering, Beijing Jiaotong University, Beijing, China
Interests: binder material; smart road construction; green materials; intelligent transportation; pavement structure
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Future road pavement materials should develop in the direction of high performance, multi-variety, and comprehensive utilization and achieve coordination between materials and the environment while taking the road of sustainable development. Traditional materials should improve both their performance and their varieties. The future development trend of traditional road materials is how to better play to their respective advantages while improving their relatively weak aspects, thereby expanding their application scope and developing and innovating new types of pavement materials on the existing material varieties. Increasing the development of composite materials is another trend in the development of pavement materials in the future. In the current era of more and more mature technology, the emergence of a completely new material is a very difficult thing. However, it is a quick and effective method to compound existing materials and avoid weaknesses. Take the ecological environment as an important factor to guide the progress of pavement materials, for example. The topics of interest in this Special Issue on innovation in pavement materials include but are not limited to green preparation and production of materials, environmentally harmonized materials, degradable materials, and solid waste utilization.

Dr. Huayang Yu
Dr. Tao Wang
Guest Editors

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Keywords

pavement materials
combined material
smart materials
environmentally harmonized materials
green material
binder

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Related Special Issue

Innovation in Pavement Materials: 2nd Edition in Buildings (4 articles)

Published Papers (12 papers)

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Research

14 pages, 11176 KiB

Open AccessArticle

Influence of Buried Pipeline Leakage on the Development of Cavities in the Subgrade

by Xianghua Chen, Wenxin Chen, Liyuan Zhao and Yekai Chen

Buildings 2023, 13(7), 1848; https://doi.org/10.3390/buildings13071848 - 21 Jul 2023

Cited by 2 | Viewed by 1229

Abstract

The rapid pace of urbanization has led to an increasing frequency of road collapses, posing a significant threat to urban traffic safety. Underground pipeline leakage stands out as the primary cause of such collapses. This paper presents a macroscopic analysis of the subgrade seepage erosion process caused by pipeline leakage. Model tests were conducted to investigate the formation mechanism and explore the influence of water level, water flow rate, and soil type. The study revealed that the subgrade seepage erosion caused by pipeline leakage undergoes four distinct stages: infiltration, slow erosion, rapid erosion, and erosion convergence. Soil erosion shares similarities with sand erosion in its developmental process. The water level plays a pivotal role in determining the shape and size of the eroded area caused by sand seepage erosion. The size of the erosion cavities formed during the soil seepage erosion increased along with the increase in the water flow rate. The size of the erosion cavity increased by up to 55.7% when the flow rate was increased by three times. In addition, clay soils do not undergo significant erosional damage but do produce significant settlement. The soil erosion process caused by underground leakages in pipelines was investigated using model tests in this study, which provided valuable information for researchers performing an in-depth analysis of the mechanism of roadbed cavities generated by urban underground pipeline leakage, which is critical for safeguarding people’s travel safety and decreasing social and economic losses. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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21 pages, 5224 KiB

Open AccessArticle

Clustering of Asphalt Pavement Maintenance Sections Based on 3D Ground-Penetrating Radar and Principal Component Techniques

by Huimin Liu, Jianhao Zheng, Jiangmiao Yu, Chunlong Xiong, Weixiong Li and Jie Deng

Buildings 2023, 13(7), 1752; https://doi.org/10.3390/buildings13071752 - 10 Jul 2023

Cited by 1 | Viewed by 983

Abstract

Asphalt pavement maintenance section classification is an important prerequisite for accurately determining asphalt pavement maintenance needs and formulating accurate maintenance plans. This paper introduces the three-dimensional (3D) ground-penetrating radar (GPR) pavement internal crack rate index on the basis of an original road surface performance data matrix, and the dimensionality of the road section classification data matrix was reduced through the principal component technique. An analysis of variance was used to compare the significance of the differences in the results for road section classification using different clustering methods and different clustering data and to investigate the influence of the clustering method, principal component technique and crack rate index on the maintenance road section classification results. The results showed that the principal component technique could reduce the dimensionality of the data matrix by 33% and retain more than 84% of the information. There was a genetic relationship between the clustering data and the technical characteristics of the classified sub-sections, and the internal crack rate was important for the characterisation of internal defects in asphalt pavement sub-sections and the determination of maintenance needs. The results of section classification varied considerably between clustering methods, and the choice of clustering method had a relationship to the pavement maintenance objectives. The dynamic clustering method combined with principal component analysis could significantly improve the significance of the differences in the clustering results, effectively improving the division of maintenance sections. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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22 pages, 1784 KiB

Open AccessArticle

Energy Consumption and Carbon Emission Analysis of Typical Regeneration Methods for Asphalt Pavements

by Jie Mao, Yongqiang Zhu, Qiwei Chen and Huayang Yu

Buildings 2023, 13(6), 1569; https://doi.org/10.3390/buildings13061569 - 20 Jun 2023

Cited by 3 | Viewed by 2307

Abstract

A quantitative evaluation was conducted on the energy consumption and carbon emissions during the asphalt pavement regeneration process, and the energy consumption and emission ratios during the construction and raw material production stages of the cold and hot regeneration process were obtained. This study applies the theory of life cycle assessment to propose an evaluation framework and calculation method suitable for quantitatively evaluating the environmental impact of the asphalt pavement regeneration process. Firstly, based on the life cycle evaluation theory, the evaluation framework and calculation method applicable to the quantitative study of the environmental impact of asphalt pavement regeneration processes are discussed, and the calculation formulae for the comprehensive energy consumption and comprehensive carbon emission of asphalt pavement regeneration are derived. It is found that the energy consumption and emission in the hot regeneration process account for 50~70% of the total process in the construction stage, and 50~65% of the total process in the cold regeneration process in the raw material production stage. Compared with the milling and resurfacing process, the energy consumption and carbon emission of the asphalt pavement regeneration process are reduced by about 16~66%, and the carbon emission is reduced by about 14~53%, so the energy saving and emission reduction benefits are more significant. The amount of RAP mixing, transportation distance of raw materials and pavement regeneration depth have a great influence on the energy consumption and emission of pavement regeneration. It can provide scientific guidance for the quantitative evaluation of the environmental impact of asphalt pavement regeneration, with a view to providing energy-saving and emission reduction level data support for technology improvement and engineering decisions. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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25 pages, 9353 KiB

Open AccessArticle

Research on the Conservation Methods of Qu Street’s Living Heritage from the Perspective of Life Continuity

by Shaojie Wang, Qian Guo, Jingjing Yuan, Huaqi Li and Bohuai Fu

Buildings 2023, 13(6), 1562; https://doi.org/10.3390/buildings13061562 - 19 Jun 2023

Cited by 2 | Viewed by 1670

Abstract

In the current context of urban development transformation and the gradual decline of historic and cultural districts, new demands have been raised for the preservation of such districts. The question of how to effectively safeguard historically and culturally significant districts, imbued with the vibrant essence of indigenous life, has become a topic worthy of contemplation. This paper takes the historical and cultural district of Leizhou Qu Street as a case study, using the concept of continuity of life as its focal point. Employing methods such as on-site observation, questionnaire surveys, and case studies, this paper investigates and evaluates the core community through identification and collaboration, and proposes corresponding preservation strategies and subsequent maintenance approaches. In doing so, the paper aims to achieve community identity, cultural heritage transmission, and the continuity of life. The findings reveal that the method of protecting the living heritage through continuity of life is applicable to historically and culturally significant districts that still thrive with the vibrancy of daily life, and this method can be effectively implemented. This research deepens our understanding of the concept of living heritage preservation in historic and cultural districts, further substantiating and implementing the principle of continuity of life in their preservation. The study also aims to provide valuable insights and references for the preservation of similar heritage sites. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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21 pages, 5499 KiB

Open AccessArticle

Research on the Rolling Process of SMA-13 Asphalt Surface Layer for Bridge Decks Based on Compaction and Skid Resistance Equilibrium Problems

by Zhilin Zhou, Wenting Zhang, Guosong Liang, Bo Chen and Junjian Yan

Buildings 2023, 13(6), 1510; https://doi.org/10.3390/buildings13061510 - 12 Jun 2023

Viewed by 1423

Abstract

In order to solve the equilibrium problem related to compaction degree, structural integrity of skid resistance, and skid resistance of asphalt wearing layer on a concrete bridge deck, the influence of rolling mode on compaction degree, structural integrity of skid resistance, and skid resistance performance was analyzed according to compaction curve characteristics, image processing technology, and laser method from the compaction mechanism and temperature control of rolling equipment. The results showed that the compaction degree and rolling times of an SMA-13 asphalt wearing course on the bridge deck could be characterized by a logarithmic model, and the model parameters had clear physical significance. Compared with the vibratory roller, the oscillation roller could achieve a greater and more stable compaction degree of the mixture and maintain a better density, compaction degree, and void ratio after 5 times of oscillation rolling. The pavement wear characteristics were extracted by a digital image method. The results showed that with the increase in rolling times, the rolling temperature decreased gradually, and the wear rate of surface texture increased significantly. The multiscale evaluation of pavement antiskid performance by a laser method showed that the surface structure gradually decreased and tended to be stable (1.2 mm) with the increase in rolling times of the vibratory roller, the microscopic texture density increased with the increase in rolling times, and the proportion of acute angle (<90°) in the peak angle of the surface texture profile decreased with the increase in rolling times. The SMA-13 asphalt wearing course on the bridge deck was rolled by a vibratory roller for 6 times, so as to achieve the balance of compaction degree, structural integrity, and skid resistance. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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22 pages, 7499 KiB

Open AccessArticle

The Development of a New Thermoplastic Elastomer (TPE)-Modified Asphalt

by Rui Dong, Aodong Gao, Ying Zhu, Bin Xu, Jierong Du and Shujiang Ping

Buildings 2023, 13(6), 1451; https://doi.org/10.3390/buildings13061451 - 2 Jun 2023

Cited by 7 | Viewed by 2264

Abstract

The use of (recycled) plastics and (waste) vulcanized rubber powder is the main polymer of raw materials, and composite organic additives are selected to fully combine with asphalt components. The physical and chemical reactions between different components are completed in dynamic mixing, establishing a morphology structure similar to thermoplastic elastomers (TPEs), and a thermoplastic highly asphaltized alloy material. TPE-modified asphalt not only significantly improves the high-temperature stability of the base asphalt, but also has the social and economic value of rational utilization of resources and turning waste into treasure. There are very few studies on the preparation of modified high-viscosity asphalt formulations using rubber and plastic as modifiers. In this study, rubber, plastic, and plasticizers were added to the base asphalt, and the TPE modifier formulations were developed through the research of new TPE modifier series and functional formulations, preparation process, and its modified asphalt properties. Meanwhile, the preparation method of the rubber–plastic alloy modifier was determined. The performance of the TPE-modified asphalt was verified through performance verification tests to evaluate the modification effect of the modifier on the base asphalt. The test results showed that the penetration, softening point, ductility, and viscosity indexes of the TPE-modified asphalt developed through the proposed formulation, and it met the specification requirements for high-viscosity modified asphalt. Rubber and plastic modifiers significantly improved the high-temperature stability of the base asphalt. In addition, the rubber–plastic modifier had a significant tackifying effect, with a dynamic viscosity of 60 °C and a Brinell rotational viscosity much greater than asphalt and rubber asphalt. The microscopic mechanism of the newly developed TPE-modified asphalt was analyzed by fluorescence microanalysis. The results showed that the rubber–plastic modifier fully swelled in the asphalt and was uniformly dispersed in the asphalt as a floc. The network structure of activated waste rubber powder-modified asphalt was more uniform and dense, resulting in good performance of the modified asphalt, and stable storage of modified asphalt was obtained. Through appropriate formulation, the comprehensive performance of the TPE-modified asphalt obtained met the requirements of pavement application and construction, providing a good theoretical basis for promoting TPE-modified asphalt. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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22 pages, 8129 KiB

Open AccessArticle

Feasibility of Pellet Material Incorporating Anti-Stripping Emulsifier and Slaked Lime for Pothole Restoration

by Kyung-Nam Kim and Tri Ho Minh Le

Buildings 2023, 13(5), 1305; https://doi.org/10.3390/buildings13051305 - 17 May 2023

Viewed by 1235

Abstract

Climate change has caused a surge in abnormal weather patterns, leading to a rise in cracks, plastic deformation, and pothole damage on road surfaces. In order to fabricate a ready-mix admixture of warm asphalt mixture (WMA) for pothole restoration, this study aimed to develop a neutralized anti-stripping material in pellet form by extruding a combination of slaked lime and a liquid emulsifier additive. Slaked lime (1% by weight of aggregate) was chosen for its ability to enhance moisture resistance, while a liquid emulsifier (wax + vegetable oil + surfactant + water) was added to create a pellet-type stripping inhibitor for WMA. After successfully fabricating the pellet admixture, this study evaluated the performance of two asphalt mixtures: conventional Slaked Lime Hot Mix Asphalt (LHMA) and the Pellet-Type Anti-Stripping Warm Mix Asphalt (PWMA). Several compatibility tests were conducted to evaluate the quality of the developed material. The results showed that the fatigue resistance of the developed material (PWMA) improved by over 20%, indicating an extended fatigue life for the pavement. The LHMA and PWMA met the quality standard for asphalt mixtures, with a TSR value of approximately 83%. Both mixtures demonstrated improved rutting resistance compared to HMA. The PWMA required 16,500 cycles, while the LHMA required 19,650 cycles to reach a settlement of 20 mm, indicating better moisture resistance than the control mix (13,481 cycles). The modified mixture performed properly in the Cantabro test, with loss rates below 20%, indicating their ability to retain their aggregate structure. The PWMA also showed superior resistance to plastic deformation, with a 12.5% lower phase angle (35°) at a reduced frequency of 10⁻³. In general, the application of PWMA not only prolongs the pavement lifespan but also reduces the production temperature by over 20 °C, leading to lower emissions and energy consumption. This makes it an environmentally friendly option for pavement applications and contributes to sustainable road construction practices. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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15 pages, 3396 KiB

Open AccessArticle

Polyolefin Elastomer Modified Asphalt: Performance Characterization and Modification Mechanism

by Zhen Ye and Yuechao Zhao

Buildings 2023, 13(5), 1291; https://doi.org/10.3390/buildings13051291 - 16 May 2023

Cited by 5 | Viewed by 1563

Abstract

The rapid growth of traffic load and volume has put forward higher requirements for road durability. To extend the service life of roads, this work investigated the feasibility of using polyolefin elastomers with a two-phase molecular structure to simultaneously improve the high and low-temperature performance of asphalt. The characteristics of the polyolefin modifier were evaluated by differential scanning calorimetry first. Following evaluation, the storage stability, workability, and rheological properties of modified polyolefin-modified asphalt were measured through softening point difference, rotary viscosity, dynamic shear rheometer, and bending beam rheometer. Additionally, the engineering performance of modified asphalt mixtures was also investigated through Marshall stability, wheel-tracking, and three points bending experiments. The results show that polyolefin has two glass transition points which facilitate the simultaneous improvement of the high and low-temperature properties of asphalt. Meanwhile, no concerns are found about the storage stability and workability of polyolefin-modified asphalt. Furthermore, the results of rheological properties indicate that polyolefin can significantly enhance the deformation resistance at high-temperature and cracking resistance at low-temperature of asphalt binders. While the fatigue performance of the polyolefin-modified asphalt is slightly reduced, the residual Marshall stability, dynamic stability, and ultimate tensile strain of the asphalt mixture containing 8% polyolefin are 1.05 times, 1.31 times, and 1.17 times those of the control sample, respectively. The results of infrared spectroscopy demonstrate that there is no chemical reaction between the polyolefin-modified and the virgin asphalt. The improvement of polyolefin on asphalt performance can be explained by the existence of both “rigid” and “flexible” structures in polyolefin. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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17 pages, 3477 KiB

Open AccessArticle

The Effect of Aging on the Molecular Distribution of Crumb Rubber Modified Asphalt Based on the Gel Permeation Chromatography Test

by Tao Wang, Zixuan Chen, Yi Wang, Yaping Cui, Yunhong Sun, Ruiling Ning, Yu Tian and Yi Zhang

Buildings 2023, 13(5), 1165; https://doi.org/10.3390/buildings13051165 - 28 Apr 2023

Cited by 6 | Viewed by 1301

Abstract

Asphalt aging is one of the main causes of asphalt pavement cracking, loosening and other issues. On a macro level, the asphalt hardens and becomes more brittle, while on a micro level, the chemical composition and molecular weight distribution change. This is a very complicated physicochemical process. Gel permeation chromatography (GPC) is a powerful technical tool for understanding the mechanism of asphalt aging and expressing the asphalt aging process. GPC can be used to measure the distribution and content of each component in the asphalt aging process. The mechanism of action of crumb rubber modified asphalt has not been fully elucidated due to its complex composition. This study investigated the molecular weight of crumb rubber modified asphalt before and after aging, and filtered asphalt based on gel permeation chromatography. The results indicated that crumb rubber itself experiences severe degradation following PAV aging and that a significant number of macromolecular materials are incorporated into the asphalt phase, causing changes in key parameters. The average molecular weight (M_w) and dispersion (D) of crumb rubber modified asphalt are directly related. At the same time, the M_w of crumb rubber modified asphalt has a positive correlation with LMS content, while SMS content has a negative correlation with M_w. The increase in crumb rubber content has a positive impact on the material interaction, and the molecular weight distribution of crumb rubber modified asphalt is affected by the reaction degree of the crumb rubber in asphalt. The complex physical and chemical reaction of crumb rubber in asphalt has a direct impact on the external macro rheological properties of asphalt. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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14 pages, 3580 KiB

Open AccessArticle

Applicability of Standard Rheological Evaluation Methods for High Content SBS Polymer Modified Asphalts

by Hongru Yao, Tao Wang, Qiang Wang, Yadong Cao and Xiaolong Zhou

Buildings 2023, 13(5), 1156; https://doi.org/10.3390/buildings13051156 - 27 Apr 2023

Cited by 4 | Viewed by 1159

Abstract

High content SBS polymer modified asphalt (HCPMA) can serve as pavements under heavy traffic and a wide range of temperatures. However, the applicability and validity of standard rheological evaluation methods to characterize HCPMA are still unclear. In this study, the influence of SBS content on the conventional properties and rheological behavior of HCPMA was analyzed. A higher content of SBS can improve the performance grade of the asphalt binder to PG100-34. The slope of the J_nr-σ linear curves from the MSCR under various stress levels decreases when the SBS content increases. The slope of the J_nr-σ linear curves can replace J_nr_diff as an indicator of stress sensitivity. A higher content of SBS can also decrease the flexural creep stiffness and increase the creep rate of the binders. The binder fatigue resistance parameter increases and the binder yields at higher strain, with increasing SBS content. These results show that a higher content of SBS can further improve the resistance to rutting, thermal cracking, and fatigue. Current standard rheological methods should be modified when evaluating HCPMA. The results also show that conventional tests are not valid for evaluating the performance of HCPMA. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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19 pages, 39308 KiB

Open AccessArticle

Study on the Rheological Properties of Formic Acid Lignin Modified Asphalt

by Meng Cai, Chao Peng and Cheng Cheng

Buildings 2023, 13(3), 655; https://doi.org/10.3390/buildings13030655 - 28 Feb 2023

Cited by 2 | Viewed by 1602

Abstract

Lignin is a major waste product of biofuel and paper industries that can be used as a modifier to improve the relevant properties of asphalt. To investigate the effect of lignin and formic acid lignin wood incorporations into asphalt and the effect on asphalt binder that was unaged and aged for 85 min, 5 h, and 10 h, a series of tests were conducted, including high- and low-temperature rheological tests by a dynamic shear rheometer (DSR), followed by Fourier transform infrared spectroscopy (FTIR) tests, and finally by gel permeation chromatography (GPC). The test results show that the additions of lignin and formic acid lignin could improve the high-temperature performance and fatigue capacity of asphalt. In addition, at the glass-transition temperature, it was observed that the additions of lignin and formic acid lignin into asphalt can effectively improve cracking at low temperatures; however, the quantity of lignin and formic acid lignin should be controlled. Fourier transform infrared spectroscopy tests showed that the purity of lignin treated with formic acid decreased, and degradation and formylation of the same formic acid-treated lignin occurred, indicating that the lignin underwent chemical changes following acid treatment. The analysis of the results by gel permeation chromatography (GPC) showed that, with aging, the average molecular weight (Mw) of lignin-modified asphalt decreased. The reason was that lignin and formic acid lignin were cracked during aging, which reduced their molecular weights. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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17 pages, 3890 KiB

Open AccessArticle

Influence of Complex Service Factors on Ravelling Resistance Performance for Porous Asphalt Pavements

by Zhihao Cheng, Shaopeng Zheng, Naixing Liang, Xiao Li and Libin Li

Buildings 2023, 13(2), 323; https://doi.org/10.3390/buildings13020323 - 21 Jan 2023

Cited by 5 | Viewed by 1561

Abstract

The study aims to analyze the influence of complex service factors on ravelling resistance performance for large-void asphalt pavements by carrying out tests on environmental and vehicle factors, conducting ultraviolet aging, freeze–thaw cycles, as well as vehicle speed simulated tests with the Rotating Surface Abrasion Test, vehicle tests, and traffic volume tests, and by making a correlation analysis between the Cantabro Abrasion test and Rotating Surface Abrasion Test. The result shows that environmental factors significantly affect the ravelling resistance performance of drainage asphalt pavements. With the increase in the times of UV aging and freeze–thaw cycles, the ravelling loss rate of asphalt specimens shows a tendency to increase, and the combined test of UV aging and freeze–thaw cycles aggravated the ravelling damage of asphalt specimens. Meanwhile, vehicle factors have a significant attenuation effect on the ravelling resistance performance of drainage asphalt pavements. With the increase in the speed, pressure, and times of the Rotating Surface Abrasion, the ravelling loss rate of asphalt specimens shows a steady tendency to increase. Furthermore, there exists a good correlation between the Rotating Surface Abrasion speed, pressure, times, and the ravelling loss rate. Finally, the two test results of the Cantabro Abrasion test and Rotating Surface Abrasion test are consistent in their changes during single/composite factor analysis, confirming the feasibility of using the Rotating Surface Abrasion test index to characterize the change in the ravelling resistance performance of drainage asphalt pavements. Full article

(This article belongs to the Special Issue Innovation in Pavement Materials)

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