Download or read book Distress Measurement and Interaction of Vehicles with Pavement Surfaces written by and published by . This book was released on 1982 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distress Measurement and Interaction of Vehicles with Pavement Surfaces written by and published by Transportation Research Board. This book was released on 1982-01-01 with total page 63 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Distress Measurement and Interaction of Vehicles with Pavement Surfaces written by and published by . This book was released on 1974 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book HRIS Abstracts written by and published by . This book was released on 1988 with total page 956 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Highway Safety Literature written by and published by . This book was released on 1984 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction Between Vehicles and Pavement Surfaces written by UNITED STATES. NATIONAL RESEARCH COUNCIL. TRANSPORTATION RESEARCH BOARD. and published by . This book was released on 1980 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements Specifications and Achievement of Smoothness for Pavement Construction written by James H. Woodstrom and published by Transportation Research Board. This book was released on 1990 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: This synthesis will be of interest to construction engineers, pavement designers, contractors, and others interested in construction of new highway pavements with smooth surfaces. Information is provided on the various devices and specifications that are being used to obtain smooth pavements. The public rates a pavement primarily on its smooth-riding characteristics and highway agencies recognize that constructing smooth pavements results in fewer problems later and lower annual maintenance costs. This report of the Transportation Research Board describes the devices and specifications highway agencies use to ensure that newly constructed pavements will provide a smooth ride.
Download or read book Distress Identification Manual for the Long term Pavement Performance Project written by and published by Strategic Highway Research Program (Shrp). This book was released on 1993 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Modeling and Analysis of Pavement Vehicle Interaction Dynamics for Pavement Distress Prediction written by Gamaleddine A. M. Elnashar and published by . This book was released on 2018 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increased road traffic combined with heavy vehicle loads lead to deterioration and distress of pavements and consequently reduces the life span of the paved roads. As a result, large amounts of financial and labor resources are spent every year to improve and maintain road infrastructures around the world. Traditionally, vehicle and pavement dynamics are treated as two separate areas of research. However, they are strongly coupled together through their contact points. Thus, one of the major concerns is to develop a more reliable dynamic pavement-vehicle interaction model to investigate and evaluate accurately both vehicle and pavement responses, and also to examine the pavement distress due to the severity of traffic loads. One of the most important distress modes in pavements is fatigue cracking. Despite the fact that there have been considerable efforts in recent years in fatigue performance evaluation and the design of flexible pavements, there is still a need for further studies in predicting fatigue cracking in terms of damage distribution considering the uncertainty and variability associated with the input parameters of pavement-vehicle interaction and traffic load repetitions. The main objective of this research study is to carry out an in-depth investigation of the dynamics of the pavement-vehicle interaction and the effect of coupling action on system response, as well as fatigue study of the pavement due to repeated traffic loads. The response of the pavement-vehicle coupled system supported by a linear visco-elastic foundation has been investigated. The vehicle is modeled as a two-degree-of-freedom quarter-vehicle model, and the pavement-foundation system is described by a simply supported Euler-Bernoulli beam resting on Pasternak foundation, while the tire is coupled to the flexible pavement with a single point contact. Galerkin method has been utilized to develop the governing differential equations of motion. Direct numerical integration approach based on implicit Newmark linear average acceleration technique has been used to solve the governing differential equations in order to evaluate the response of the coupled system. Results have been validated with previous research work and also compared with those of conventional uncoupled system. The effects of different parameters such as vehicle speed, road roughness, soil stiffness and suspension damping on the responses are then investigated. For the fatigue study of flexible pavements, a methodology, for modeling pavement damage and predicting fatigue cracking of flexible pavements is presented. The methodology is based on the combination of deterministic method and stochastic approach using Palmgren-Miner's hypothesis in which Poisson process is employed to characterize the actual repetitions of traffic load. Different models are then presented to estimate the fatigue life of the pavement surface layer. The results are compared and discussed.
Download or read book Automated Pavement Distress Collection Techniques written by Kenneth H. McGhee and published by Transportation Research Board. This book was released on 2004 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.
Download or read book Publications Catalog written by National Research Council (U.S.). Transportation Research Board and published by . This book was released on 1985 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Report No FHWA RD written by United States. Federal Highway Administration. Offices of Research and Development and published by . This book was released on 1974 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tire pavement Interaction Experimental Measurements and Modeling written by Mohammad O. Al-Assi and published by . This book was released on 2019 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing an adequate level of skid resistance is essential for the safety of motorists. Previous studies demonstrated that the number of crashes is reduced if pavements have sufficient friction, especially in wet conditions. Adequate pavement friction prevents the vehicle from sliding on the pavement surface and provides the grip needed to maintain control over the vehicle. The first phase of this study investigated experimentally the two major friction mechanisms (i.e., adhesion and hysteresis) that contribute to tire-pavement friction. It is postulated that the adhesion between rubber tires and pavements is highly influenced by the surface free energy. However, there are no previous studies carried out to investigate the adhesion between rubber tires and pavements using the surface free energy. The results demonstrated that adhesion friction can be quantified by measuring the surface free energy components of pavement surface aggregates and rubber materials. There was a fair correlation between the adhesive bond energy and the measured coefficient of friction. Higher adhesion between rubber materials and pavement surface provided higher friction. These results provide a fundamental understanding of the mechanisms of rubber-pavement friction and verification of the relationship between adhesion and friction. In addition, there was a strong correlation between friction and rubber rheological properties. Rubber materials with lower modulus provided higher friction compared to those with higher modulus. These results explain the change in skid resistance with temperature throughout the year. The second phase of this study examined different factors that affect skid resistance of pavement surfaces. These parameters included macrotexture, microtexture, and driving speed. The macrotexture of the pavement is related to aggregate gradation of the mix or surface texture pattern. The microtexture is influenced by the roughness of the aggregate particles and their resistance to abrasion and polishing under traffic. This study proposed a new model that can be used to estimate the skid number at a given speed between 20 mph and 60 mph as a function of both macrotexture and microtexture of pavement surface. This model was developed based on the measured frictional characteristics of field test sections. The proposed model can be used if the full-scale friction tester is not available or cannot be used due to the limited length of the test section (e.g., bridge deck). In addition, the model provides a tool to the pavement engineers to ensure adequate skid resistance at various operation speeds during the mix design stage and before the mix is used in the field. A given mix design can be modified to improve its frictional characteristics at early stage which leads to cost savings often spent on the application of surface treatments. The third phase of this study utilized the close-range photogrammetry (CRP) technique to measure the pavement macrotexture and microtexture. Texture parameters were calculated from the collected and analyzed images of the pavement surface. The results of the CRP texture measurements were compared to standard test methods. The CRP texture measurements had excellent correlation with the standard methods; however, the CRP offers simple and accurate, yet inexpensive alternative to the current methods used to measure surface macrotexture and microtexture. In addition, the CRP texture parameters were incorporated in the Persson friction model to predict skid friction as a function of rubber properties. The results demonstrated excellent correlation between measured and predicted friction. This study greatly simplified the texture parameter calculations needed in the Persson friction model with good accuracy.The last component of this study developed a 3D finite element model to investigate the effect of surface characteristics along with rubber properties on the contact stress between the standard skid test tire and pavement surface. Such simulation provides an in-depth understanding of tire-pavement interaction that would require expensive resources to examine in the field. Study parameters included various coefficient of friction, texture (e.g., smooth, and grooved), tire rolling conditions (fully skidding and free rolling) as well as temperature. The developed 3D FE model of the test tire was first validated with laboratory measurements before it was used to examine the effect of the study parameters on tire-pavement contact stresses. The results of the finite element simulations demonstrated that the stress distribution at the tire-pavement interface is non-uniform with maximum values towards the edges of the tire. These findings were consistent with the wearing pattern of the test tire in the field. In addition, the results also demonstrated that the shear stresses increased with surface friction while there was no significant change in the vertical stresses. The grooved surface exhibited higher vertical and shear stresses compared to pavement with smooth texture. The grooved texture is used to improve skid resistance and reduce the noise of pavement surfaces. In addition, temperature was found to have significant impact on the stresses at the tire-pavement interface. The finite element simulation results agreed with the laboratory and field measurements of pavement friction.
Download or read book Guide for Pavement Friction written by and published by AASHTO. This book was released on 2008 with total page 87 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains guidelines and recommendations for managing and designing for friction on highway pavements. The contents of this report will be of interest to highway materials, construction, pavement management, safety, design, and research engineers, as well as others concerned with the friction and related surface characteristics of highway pavements.
Download or read book Announcement of Highway Safety Literature written by and published by . This book was released on 1984 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The U S Department of Transportation s Comprehensive Truck Size and Weight Study Volume II Issues and Background written by and published by . This book was released on 2000 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1982 with total page 1094 pages. Available in PDF, EPUB and Kindle. Book excerpt:
