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Roadside bioretention and permeable pavements have proven effectiveness in rainwater filtration and waterlogging mitigation, but conventional street design approach could not accommodate their work in conjunction. In this research, possible roadside facilities allowing water transmission from permeable pavements and bioretention to the pipe system are proposed. Hydraulic properties of the comprised elements were analyzed, including rainfall intensity, permeable pavements, soil layers and pipe systems. A transformation method was formulated to obtain a successive time-intensity formula from conventional design parameters to describe the rainfall behavior, and therefore the water retention capacity of the bioretention could be considered. A test section of 1.6 km combining permeable pavements and roadside bioretention was constructed, and its hydraulic performance was predicted based on the proposed design method and Storm Water Management Model (SWMM). The research results suggest that the bioretention facilities and permeable pavements cooperate well in the test section. In a light rain event, the proposed street has favorable performance in rainwater collection and filtration. In a relatively intense rainstorm event, the street collects and filters water in the initial stage, but will have similar hydraulic performance to a conventional street once the retention facilities are saturated. Thus, no reduction in diameters of drainage pipes from conventional designs is suggested in similar projects.
Yiqing Dai; Jiwang Jiang; Xingyu Gu; Yanjing Zhao; Fujian Ni. Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice. Sustainability 2020, 12, 8288 .
AMA StyleYiqing Dai, Jiwang Jiang, Xingyu Gu, Yanjing Zhao, Fujian Ni. Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice. Sustainability. 2020; 12 (19):8288.
Chicago/Turabian StyleYiqing Dai; Jiwang Jiang; Xingyu Gu; Yanjing Zhao; Fujian Ni. 2020. "Sustainable Urban Street Comprising Permeable Pavement and Bioretention Facilities: A Practice." Sustainability 12, no. 19: 8288.
In order to investigate the fatigue cracking resistance of engineered cementitious composites (ECC) used in in total life pavement, the semi-circular bending (SCB) test and improved three-point bending fatigue test (ITBF) were utilized in this study. The digital image correlation (DIC) method was also utilized to track the surface strain fields of specimens during the SCB test. X-ray computed tomography (CT) and digital image processing (DIP) technologies were applied to measure the internal-crack distribution of the ITBF specimen. The results of the SCB test showed that the fatigue cracking damage process of ECC can be divided into three stages and that the cracking stable propagating stages occupied the main part, which indicates that ECC has excellent ductility and toughness and could work very well with existing cracks. The ITBF results showed that the fatigue cracking resistance of ECC was better than epoxy asphalt concrete (EAC). In addition, the internal-crack distribution along the depth direction of the ITBF specimen could be presented well by the image pixel statistical (IPS) method based on CT scanning of image slices. It could be found that multiple cracks propagate simultaneously in ECC, instead of a single crack, under the OSBD pavement working condition.
Yanjing Zhao; Jiwang Jiang; Fujian Ni; Lan Zhou. Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement. Applied Sciences 2019, 9, 3577 .
AMA StyleYanjing Zhao, Jiwang Jiang, Fujian Ni, Lan Zhou. Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement. Applied Sciences. 2019; 9 (17):3577.
Chicago/Turabian StyleYanjing Zhao; Jiwang Jiang; Fujian Ni; Lan Zhou. 2019. "Fatigue Cracking Resistance of Engineered Cementitious Composites (ECC) under Working Condition of Orthotropic Steel Bridge Decks Pavement." Applied Sciences 9, no. 17: 3577.
Semi-Circular Bending (SCB) test has been used widely to investigate the cracking behaviour of asphalt mixtures, and fracture parameters can be obtained. In this paper, heterogeneous fracture modelling technology is presented to simulate crack evolution in asphalt mixtures under SCB test. Digital image processing methods are employed to generate 2-dimensional (2D) scanned images of an asphalt mixture cutting surface. Finally, a 2D heterogeneous numerical model is created for an asphalt mixture specimen, and the numerical cohesive crack model is utilised to estimate the crack resistance of the interface based on a laboratory fracture test. The inception and propagation of main macrocracks are carefully studied for the asphalt mixture. Load–displacement curves are plotted, and corresponding tensile strength and fracture strain energy density are calculated. The analysing results of numerical simulation are proved to be quite consistent with the actual experimental test results, and the reliability of the numerical model is verified.
Yanjing Zhao; Fujian Ni; Lan Zhou; Jiwang Jiang. Heterogeneous fracture simulation of asphalt mixture under SCB test with cohesive crack model. Road Materials and Pavement Design 2016, 18, 1411 -1422.
AMA StyleYanjing Zhao, Fujian Ni, Lan Zhou, Jiwang Jiang. Heterogeneous fracture simulation of asphalt mixture under SCB test with cohesive crack model. Road Materials and Pavement Design. 2016; 18 (6):1411-1422.
Chicago/Turabian StyleYanjing Zhao; Fujian Ni; Lan Zhou; Jiwang Jiang. 2016. "Heterogeneous fracture simulation of asphalt mixture under SCB test with cohesive crack model." Road Materials and Pavement Design 18, no. 6: 1411-1422.