Editorial: Trends and Advanced Materials for Pavement and Road Infrastructure

Welcome to the special issue of 2021 “Trends and Advanced Materials for Pavement and Road Infrastructure”. A year with the Covid-19 pandemic has caused great impacts on all aspects of society worldwide. With the current challenges, this special issue offers four interesting technical papers comprising research on bitumen modification, pavement noise, waste material, and modeling of concrete bridges. In the last decade, research into the alteration of road materials has progressed significantly. This is because the material used has a dominant role, particularly in determining pavement performance, and is closely related to the sustainability of road construction. It is also a significant aspect to be considered in road construction and maintenance for its long-term performance. Various research topics are available to address this issue and extend the pavement’s service life with several new techniques emerging in the field of advanced materials for pavement and road infrastructure. Hence, the editorial team believes it is important to pay special attention to this issue. In the present issue of Frontiers in Materials, two of the four articles accepted deal with the different aspects of asphalt modification, and the rest cover pavement modelling. The first paper by Suo et al. addressed the applicability of waste corn oil and soybean oil in the performance recovery of aged bitumen in recycled asphalt mixture. The materials were tested for physical properties, viscosity, and detailed rheological characteristics. It was concluded that the vegetable oil effectively reduces the viscosity and stiffness of the aged bitumen and improves fatigue and low temperature cracking resistance. The findings show improvement in the bitumen recovery with a recommendation that between 6 and 8% vegetable oil is suitable to be used in mixing with the aged bitumen. In recent years, the proliferation of plastic waste has become a global problem. In line with the aim of this research topic, Radeef et al. highlighted the effectiveness of using plastic waste as an additive in the asphalt mixture. Crushed granite aggregate with a size of 14mm and shredded plastic waste in the range of 5–10mmwere applied in the study. The authors concluded that the addition of plastic waste using the dry process leads to deviation in the aggregate structure (high plastic content). Asphalt mixtures modified with 1% plastic waste via dry method showed significant enhancement in the asphalt pavement performance. Preventive maintenance techniques for asphalt pavements such as micro-surface (MS) have the advantages of waterproofing and crack sealing. Chen et al. presented their study on the surface texture of pavements with low-noise micro-surface using three-dimensional imaging technology. In the investigation, five low-noise MS were systematically analyzed and compared based on surface texture and noise. A three-dimensional digital texture model (3D-DTM) of MS surface texture was Edited and reviewed by: John L. Provis, The University of Sheffield, United Kingdom


Trends and Advanced Materials for Pavement and Road Infrastructure
Welcome to the special issue of 2021 "Trends and Advanced Materials for Pavement and Road Infrastructure". A year with the Covid-19 pandemic has caused great impacts on all aspects of society worldwide. With the current challenges, this special issue offers four interesting technical papers comprising research on bitumen modification, pavement noise, waste material, and modeling of concrete bridges.
In the last decade, research into the alteration of road materials has progressed significantly. This is because the material used has a dominant role, particularly in determining pavement performance, and is closely related to the sustainability of road construction. It is also a significant aspect to be considered in road construction and maintenance for its long-term performance. Various research topics are available to address this issue and extend the pavement's service life with several new techniques emerging in the field of advanced materials for pavement and road infrastructure. Hence, the editorial team believes it is important to pay special attention to this issue.
In the present issue of Frontiers in Materials, two of the four articles accepted deal with the different aspects of asphalt modification, and the rest cover pavement modelling.
The first paper by Suo et al. addressed the applicability of waste corn oil and soybean oil in the performance recovery of aged bitumen in recycled asphalt mixture. The materials were tested for physical properties, viscosity, and detailed rheological characteristics. It was concluded that the vegetable oil effectively reduces the viscosity and stiffness of the aged bitumen and improves fatigue and low temperature cracking resistance. The findings show improvement in the bitumen recovery with a recommendation that between 6 and 8% vegetable oil is suitable to be used in mixing with the aged bitumen.
In recent years, the proliferation of plastic waste has become a global problem. In line with the aim of this research topic, Radeef et al. highlighted the effectiveness of using plastic waste as an additive in the asphalt mixture. Crushed granite aggregate with a size of 14 mm and shredded plastic waste in the range of 5-10 mm were applied in the study. The authors concluded that the addition of plastic waste using the dry process leads to deviation in the aggregate structure (high plastic content). Asphalt mixtures modified with 1% plastic waste via dry method showed significant enhancement in the asphalt pavement performance.
Preventive maintenance techniques for asphalt pavements such as micro-surface (MS) have the advantages of waterproofing and crack sealing. Chen et al. presented their study on the surface texture of pavements with low-noise micro-surface using three-dimensional imaging technology. In the investigation, five low-noise MS were systematically analyzed and compared based on surface texture and noise. A three-dimensional digital texture model (3D-DTM) of MS surface texture was constructed using a series of digital image processing techniques. The authors found that the digital image processing techniques are very helpful in analyzing the pavement texture characteristics and are also a promising tool to optimize the design of low-noise MS.
Time-dependent responses of cracked structures are complex due to the intertwined effects between creep-shrinkage and cracking. Our final paper highlights the lack of an effective numerical model to accurately predict the nonlinear pattern of long-term deflections. Therefore, Tong et al. proposed the gradient nonlocal enhanced micro pre-stress-solidification theory with finite elements. From the proposed model, they found that the proposed model reflects the creep and shrinkage properties of concrete with respect to underlying moisture transport and heat transfer.
In general, we hope that the detailed research presented in this special issue provides a better understanding and interest to all researchers and practitioners who are focused on the recent developments and advancements in analyzing pavement performance and road infrastructure.