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With their quick drainage, enhanced skid-resistance under wet conditions, noise-reducing effect, and lessened splashing and spraying, porous asphalt pavements are now receiving more and more attention. Since research and application of porous asphalt pavements has just started in China at present, there are no corresponding design and construction specifications. Therefore, it is essential to verify the design through actual field performance monitoring on such pavement as those of the Yan-Tong Expressway. This highway is ideal for such an investigation since it includes a section of porous asphalt surface together with stone mastic asphalt and another type of dense graded surface in the same section. The major parameters of the assessment consist of permeability and skid-resistance that are essential to porous asphalt pavements and rutting depth under heavy traffic. We use a simulation model to predict the rutting depth in the short term. The results show that porous asphalt pavement performs well under the heavy truck traffic volume on the Yan-Tong Expressway.
This book is about how you listen and what you hear, about how to have a dialogue with the sounds around you. Marcia Jenneth Epstein gives readers the impetus and the tools to understand the sounds and noise that define their daily lives in this groundbreaking interdisciplinary study of how auditory stimuli impact both individuals and communities. Epstein employs scientific and sociological perspectives to examine noise in multiple contexts: as a threat to health and peace of mind, as a motivator for social cohesion, as a potent form of communication and expression of power. She draws on a massive base of specialist literature from fields as diverse as nursing and neuroscience, sociology and sound studies, acoustic ecology and urban planning, engineering, anthropology, and musicology, among others, synthesizing and explaining these findings to evaluate the ubiquitous effects of sound in everyday life. Epstein investigates speech and music as well as noise and explores their physical and cultural dimensions. Ultimately she argues for an engaged public dialogue on sound, built on a shared foundation of critical listening, and provides the understanding for all of us to speak and be heard in such a discussion. Sound and Noise is a timely evaluation of the noise that surrounds us, how we hear it, and what we can do about it.
This report summarizes the construction and early performance of a field trial of a Porous Friction Course (PFC) in Indiana. The PFC is compared to an adjacent section of Stone Matrix Asphalt (SMA) constructed at the same time using the same binder, coarse aggregate and fiber. Those mixes are also compared to a similar conventional Hot Mix Asphalt (HMA) surface constructed one to two months earlier. This evaluation shows that the PFC produces significantly lower noise levels than the HMA and SMA as measured by both the pass-by and close-proximity methods. The SMA produces higher noise levels than the HMA. The PFC also had the highest surface texture, as measured by the Circular Texture Meter; the HMA had the lowest texture. Data from the Circular Texture Meter and Dynamic Friction Tester were combined to determine the International Friction Index (FN60). The PFC provided the highest friction value, followed by the SMA. Both the PFC and SMA had substantially higher friction values than the HMA even though they were tested before opening the road to traffic. The friction values for the PFC and SMA are expected to increase after traffic wears away the binder film coating the protruding aggregate particles. The PFC also reduced splash and spray and improved visibility during rain events, as observed qualitatively. Long term performance of the PFC should be monitored to determine how long these benefits last, but initially the PFC appears to offer an efficient and economical way to reduce noise and maintain or even improve friction and visibility.
Functional Pavements is a collection of papers presented at the 6th Chinese-European Workshop (CEW) on Functional Pavement Design (Nanjing, China, October 18-21, 2020). The focus of the CEW series is on field tests, laboratory test methods and advanced analysis techniques, and cover analysis, material development and production, experimental characterization, design and construction of pavements. The main areas covered by the book include: • Asphalt binders for flexible pavements • Asphalt mixture evaluation and performance • Pavement construction and maintenance • Pavement Surface Properties and Vehicle Interaction • Cementitious materials for rigid pavements • Pavement geotechnics and environment Functional Pavements aims at contributing to the establishment of a new generation of pavement design methodologies in which rational mechanics principles, advanced constitutive models and advanced material characterization techniques shall constitute the backbone of the design process. The book will be much of interest to professionals, academics and practitioners in pavement engineering and related disciplines as it should assist them in providing improved road pavement infrastructure to their stakeholders.
NCHRP Report 583 explores the effects of subsurface drainage features on pavement performance through a program of inspection and testing of the subsurface drainage features present in the Long-Term Pavement Performance SPS-1 (flexible hot-mix asphalt pavement) and SPS-2 (rigid portland cement concrete pavement) field sections.
Rapid deterioration of pavements depends on both objective and subjective factors. This study investigates the relationships among six parameters?climate, traffic volume, distress, friction, longitudinal profile, and transverse profile?related to asphalt pavement performance. For this purpose, LTPP InfoPave, the largest pavement performance database provided by the Long-Term Pavement Performance (LTPP) program, is used. The LTPP InfoPave data exhibit the characteristics of five V's (volume, velocity, variety, value, veracity) of "big data." The correlation analyses are conducted on the basis of the LTPP program's Specific Pavement Study-3 experiments. Analysis results for the data from 1987 to 2005 reveal that the average block cracking area and average raveling area are highly correlated with a correlation coefficient of maximum 0.85. The average mean roughness index (MRI) is correlated with the average block cracking area and the average raveling area with correlation coefficients 0.59 and 0.64, respectively. The results also indicate that smoothness and surface distress have relatively lower correlation; these results are consistent with the previously published results. In addition, for the traffic volume data from 1990 to 2014, the MRI is found to be higher at higher traffic volume, indicating rougher pavement, but this difference is statistically insignificant (correlation coefficient, 0.423). At the beginning and end of the section, traffic volume is highly correlated with friction, having correlation coefficients of 0.711 and 0.646, respectively. This study serves as a reference for the use of big data to gain an in-depth understanding of pavement performance, and engineers can continue to explore the application of the LTPP program using big data computing approaches.
Premature damage is currently the main problem with heavy-duty asphalt pavements. In order to decrease such premature damage, it is necessary to develop a new design system meeting the requirements of heavy-duty pavements. Based on considerable field investigations and mechanistic analysis, a five-phase design procedure, including data collection, structural combination design, structural thickness design, material testing and examination, and a final decision, was established. The procedure is a comprehensive design tool employing performance-related structural design consideration and mechanistic-based material design consideration that can link performance analysis, structural design, and material design (tests). After consideration of the extensive pavement performance data collected and subsequent analysis, relevant design equations and design criteria were proposed, including whole life asphalt pavement structural behavior equations, life cycle cost analysis models, field fatigue equations, and a shear-based rutting prediction model. As research progressed, test roads and pilot roads were constructed in ten provinces of China, and the first test road has been used successfully for 15 years.
The Virginia Department of Transportation constructed a 2.52-acre parking lot of porous asphaltic pavement in Warrenton, Virginia. Runoff from the lot was collected and monitored for quantity, detention time, and quality. Prior to the lot opening for public use, three storms were successfully monitored. After the lot was opened to the public, four storms were monitored to ascertain whether traffic affected the lot's performance. It was determined that the lot was not performing as desired in the detention of runoff because of the slope across the parking lot, thus this portion of the research effort was terminated. The structural strength of the pavement has been monitored and has performed well for four years. Two recommendations that address design considerations were made as a result of this study. 1. The permeability of the underlying soil layers should be determined and considered as the main criterion in the design. 2. The subgrade and riding surface of a porous asphaltic pavement should not have any slope.
Structural Behavior of Asphalt Pavements provides engineers and researchers with a detailed guide to the structural behavioral dynamics of asphalt pavement including: pavement temperature distribution, mechanistic response of pavement structure under the application of heavy vehicles, distress mechanism of pavement, and pavement deterioration performance and dynamic equations. An authoritative guide for understanding the key mechanisms for creating longer lasting pavements, Structural Behavior of Asphalt Pavements describes the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performances, and demonstrates the process of pavement analyses and designs, approaching science from empirical analyses.
Functional Pavement Design is a collections of 186 papers from 27 different countries, which were presented at the 4th Chinese-European Workshops (CEW) on Functional Pavement Design (Delft, the Netherlands, 29 June-1 July 2016). The focus of the CEW series is on field tests, laboratory test methods and advanced analysis techniques, and cover analysis, material development and production, experimental characterization, design and construction of pavements. The main areas covered by the book include: - Flexible pavements - Pavement and bitumen - Pavement performance and LCCA - Pavement structures - Pavements and environment - Pavements and innovation - Rigid pavements - Safety - Traffic engineering Functional Pavement Design is for contributing to the establishment of a new generation of pavement design methodologies in which rational mechanics principles, advanced constitutive models and advanced material characterization techniques shall constitute the backbone of the design process. The book will be much of interest to professionals and academics in pavement engineering and related disciplines.