China
Africa
Explore chapters and articles related to this topic
Estimation of durability of new surface courses using accelerated load test and expert's opinions
Published in Inge Hoff, Helge Mork, Rabbira Garba Saba, Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields, Volume 3, 2022
B. Kalman, D. Lo Presti, G. Di Mino, K. Mantalovas, E. Keijzer, T. Pary, L. Neves, R. Kleizienė
There are many different mechanisms which potentially and eventually put a limit on the service life of a surface course. Three main components for the degradation of the surface courses are ageing, climate and traffic. Ageing is usually a consequence of oxidation or UV light. Climate puts stress on the road surface through freeze-thaw cycles; presence of water; extreme temperatures and temperature cycles. Traffic induces stresses and strain on the surface course. The surface course is also a part of the road structure and thus protects to higher or lesser extent the other parts of the structure. If other layers in the structure fails, this will eventually have consequences for the surface course.
Flexible and composite pavement
Published in Malcolm Copson, Peter Kendrick, Steve Beresford, Roadwork, 2019
Malcolm Copson, Peter Kendrick, Steve Beresford
Recycling the existing road surface has emerged as a good cost effective method in many recent trials. Two key issues are being addressed, the quality of the material to be recycled and the type of binder added to make the rejuvenated asphalt mix work. Two techniques may be used – either the ex situ or the in situ method.
Business Response
Published in Prasad Modak, Environmental Management towards Sustainability, 2018
As described above, ISO 14001 (2015) adopted a Lifecycle Approach where identification of environmental aspects/impacts was recommended using a life-cycle perspective. A road construction company, for example, was expected to come up with ideas such as recycling/reuse (where top layers of the road surface can be reused while resurfacing) and use recycled material (e.g., Use of plastics as binder material and use of fly ash).Table 4.2 shows a comparison between ISO 14001 (2004) and ISO 14001 (2015) EMS.
Pedestrian fatality and impact speed squared: Cloglog modeling from French national data
Published in Traffic Injury Prevention, 2018
Speed estimation was possible in cases where police reports included the following: A scale drawing of the crash, showing final positions of vehicle and pedestrian, impact points, any traces left by the vehicle, and vehicle direction before the crash.A description of road conditions, particularly the road surface.Photographs of the crash scene allowing estimation of impact severity.Witness statements specifying the sequence of events.
Investigation on self-healing performance of asphalt mixture containing microcapsules and survival behaviour of microcapsules
Published in International Journal of Pavement Engineering, 2023
Yun Chen, Xiaoping Ji, Botong Si, Zhengming Zhang, Dongye Shao, Shiyu Zhu, Shupeng He
Asphalt mixture, which has high flatness and good economy, is the preferred material for highway construction worldwide. However, the cracks produced under repeated loads and the external environment seriously affect the life of asphalt pavement (Jiang et al.2020). The temperature sensitivity of the asphalt material is relatively large. Under the condition of relatively high temperature, the asphalt has a certain flow ability. The cracks generated on the road surface can be slowly healed by the diffusion of the asphalt (Xiang et al. 2020, Wang et al. 2022). However, under the repeated action of ambient temperature and pavement load, the repair capacity of asphalt is not sufficient to repair the cracks that appeared in the pavement in time (Kim et al.2014).
Sub-catchment-based urban flood risk assessment with a multi-index fuzzy evaluation approach: a case study of Jinjiang district, China
Published in Geomatics, Natural Hazards and Risk, 2023
Xuejin Ying, Ting Ni, Mingxia Lu, Zongmin Li, Yi Lu, Olusola Bamisile, Mark Pelling
Second, a combination of nature-based solutions can be applied in residential and commercial areas (Sichuan Provincial Department of Housing and Urban-Rural Development 2017). For higher-risk areas with denser residential and commercial buildings, such as the Feicuicheng court in the Feicuicheng neighbourhood committee, Beverly court in the Jiahong road neighbourhood committee, Huangjing garden court in the Huangjing neighbourhood committee, green roofs accounting for 40% of the building roof area can be applied. In addition, permeable materials can be used for road reconstruction in the higher-risk areas, combined with the ecological grassland on the roadside to increase the water permeability of the road surface.