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The Role Of Aggregate Type And Gradation Upon Pavement And Skid Resistance
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Book Synopsis The Role of Aggregate Type and Gradation Upon Pavement and Skid Resistance by : Eldridge Augustus Whitehurst
Download or read book The Role of Aggregate Type and Gradation Upon Pavement and Skid Resistance written by Eldridge Augustus Whitehurst and published by . This book was released on 1970 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Relationship of Aggregate Microtexture to Asphalt Pavement Skid Resistance by : Anthony Luce
Download or read book Relationship of Aggregate Microtexture to Asphalt Pavement Skid Resistance written by Anthony Luce and published by . This book was released on 2007 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregate properties are one of the important factors that influence the asphalt pavement skid resistance. This paper presents a detailed analysis of aggregate texture and its relationship to pavement skid resistance. A new method is developed for the evaluation of aggregate resistance to polishing. This method relies on the Micro-Deval test as the mechanism for polishing aggregates and the Aggregate Imaging System (AIMS) for quantifying the change in texture due to polishing. The results show that the Micro-Deval test is an effective method for polishing aggregates within a short time. Also, the AIMS texture analysis is able to rapidly and accurately quantify the influence of polishing on texture. The verification of the new method was achieved through measuring the skid resistance of pavements constructed using three different aggregate sources and three different aggregate gradations. The skid resistance was found to be related not only to average aggregate texture, but also to the texture distribution within an aggregate sample. The developed method can be used in models for predicting the change in asphalt pavement skid resistance as a function of aggregate texture, mixture properties, and environmental conditions.
Book Synopsis Effects of the Geometric Characteristics and Gradation of the Aggregates on the Skid Resistance of Bituminous-aggregate Mixtures by : Taghi Ebrahimzadeh
Download or read book Effects of the Geometric Characteristics and Gradation of the Aggregates on the Skid Resistance of Bituminous-aggregate Mixtures written by Taghi Ebrahimzadeh and published by . This book was released on 1971 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Skid Resistance of Highway Pavements by :
Download or read book Skid Resistance of Highway Pavements written by and published by ASTM International. This book was released on 1973 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Skid Resistance by : Delmar L. Bloem
Download or read book Skid Resistance written by Delmar L. Bloem and published by . This book was released on 1971 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of a Prediction Model for Skid Resistance of Asphalt Pavements by : Arash Rezaei
Download or read book Development of a Prediction Model for Skid Resistance of Asphalt Pavements written by Arash Rezaei and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The skid resistance of asphalt pavement is a major characteristic that determines the driving safety on a road, especially under wet surface conditions. Skid resistance is primarily a function of the microtexture and macrotexture of a pavement surface. Microtexture is influenced by aggregate surface characteristics and is required to disrupt the continuity of surface water film and attain frictional resistance between the tire and the pavement surface. Macrotexture is affected mostly by mixture design or aggregate gradation and contributes to skid resistance by providing drainage paths of water that can be otherwise trapped between a tire and a pavement surface. The increase in macrotexture contributes to preventing hydroplaning and improving wet frictional resistance, particularly at high speeds. While much research has been conducted in the past to identify material factors that affect skid resistance, there is still a need to develop a model for predicting asphalt pavement skid resistance as a function of mixture characteristics and traffic level. The purpose of this study was to develop such a model based on extensive laboratory experiments and field measurements involving different mixture types and aggregate sources. The model incorporates functions that describe the resistance of aggregates to polishing and aggregate size distribution. The aggregate resistance to polishing was quantified by measuring aggregate texture using the Aggregate Imaging System (AIMS) before and after polishing in the Micro-Deval device. The analysis in this dissertation demonstrates how this model can be used to design mixtures and classify aggregates that provide desirable skid resistance levels.
Book Synopsis Development of Prediction Models for Skid Resistance of Asphalt Pavements by : Sand Aldagari
Download or read book Development of Prediction Models for Skid Resistance of Asphalt Pavements written by Sand Aldagari and published by . This book was released on 2017 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pavement skid resistance is one of the primary factors in highway safety. Pavements with adequate skid resistance reduce the number of crashes in wet conditions. The friction between pavement surface and vehicle tires is related to the macrotexture and microtexture of pavement surface. The macrotexture of asphalt pavement is dependent on aggregate gradation, while the microtexture is dependent on aggregate shape characteristics. Aggregates with angular shape and rough texture provide higher level of skid resistance compared to aggregates with smooth surface. In addition, pavement surfaces with high macrotexture provide higher skid resistance compared to those with low macrotexture. There were two main objectives of this study. The first object was to investigate and examine the surface and friction characteristics of various test sections of asphalt mixtures as well as seal coat surfaces. The test sections included different asphalt mixture types (e.g., dense graded, stone matrix asphalt, porous friction course), seal coat grades (Grade 1, Grade 2, and Grade 3), aggregate types (e.g., limestone, gravel, granite, sandstone), and the test sections were located in regions with different environmental conditions. The second objective was to develop a predictive model for skid resistance of seal coat surfaces and validate and revise an existing skid prediction model for asphalt pavements. Field testing primarily included measurements of coefficient of friction using a dynamic friction tester, pavement surface texture using a circular texture meter, and skid number using a skid trailer. The measurements were conducted on the outer lane where pavement surfaces experience significant polishing rates because most of the trucks use that lane. The resistance of aggregate to polishing and abrasion was studied using laboratory test methods. Several analytical models were developed to predict the friction and skid resistance of asphalt pavements and seal coat surfaces over their service life. These models incorporate parameters that describe aggregate resistance to abrasion and polishing, aggregate shape characteristics, aggregate gradation, and traffic level. These models were developed based on comprehensive field testing and aggregate laboratory characterization. Good correlations were found between the developed models and experimental data. The results demonstrated that aggregate and surface characteristics as well as traffic level have significant effect on skid resistance and rate of skid reduction. These models can be used during the mix design procedure to optimize the aggregate selection and aggregate gradation to produce mixtures with proper friction. In addition, these models can be incorporated in a Project Management System (PMS) at the network level to plan and program preventive maintenance activities to ensure that pavements have adequate skid resistance.
Book Synopsis Predicting Asphalt Mixture Skid Resistance Based on Aggregate Characteristics by : Eyad Masad
Download or read book Predicting Asphalt Mixture Skid Resistance Based on Aggregate Characteristics written by Eyad Masad and published by . This book was released on 2009 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Aggregates and Mineral Fillers on Asphalt Mixture Performance by : Richard C. Meininger
Download or read book Effects of Aggregates and Mineral Fillers on Asphalt Mixture Performance written by Richard C. Meininger and published by ASTM International. This book was released on 1992 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: Resulting from the Symposium on [title], held in December 1991, at the ASTM Standardization Meetings in San Diego, this volume comprises 19 papers in four sections: aggregates; mineral fillers; mixture evaluation; and fatigue, modeling, and theoretical. Member price, $52. Annotation copyright Book N
Book Synopsis Field Evaluation of Asphalt Mixture Skid Resistance and Its Relationship to Aggregate Characteristics by : Eyad Masad
Download or read book Field Evaluation of Asphalt Mixture Skid Resistance and Its Relationship to Aggregate Characteristics written by Eyad Masad and published by . This book was released on 2010 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the findings from the research that was carried out as part of Phase II of TxDOT Project 0-5627. The research included measurements and analysis of mechanical and physical properties of aggregates used in surface mixes in the state of Texas. These properties were aggregate shape characteristics measured using the Aggregate Imaging System (AIMS), British Pendulum value, coarse aggregate acid insolubility, Los Angeles weight loss, Micro-Deval weight loss, and Magnesium sulfate weight loss. In addition, a database of field skid number measurements that were collected over a number of years using the skid trailer was developed. The Dynamic Friction Tester (DFT) and Circular Texture Meter (CTMeter) were used to measure friction and texture, respectively, of selected asphalt pavement sections. These data and measurements were used to carry out comprehensive statistical analyses of the influence of aggregate properties and mixture design on skid resistance value and its variability. Consequently, a method and software were developed for predicting asphalt pavement skid resistance. This method requires inputs that describe aggregate resistance to polishing, mixture gradation, and traffic. The developed software can be used to select the mixture type and aggregate source that are needed to achieve the required level of skid resistance for a given service life.
Book Synopsis Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields by : Inge Hoff
Download or read book Eleventh International Conference on the Bearing Capacity of Roads, Railways and Airfields written by Inge Hoff and published by CRC Press. This book was released on 2021-11-10 with total page 501 pages. Available in PDF, EPUB and Kindle. Book excerpt: Innovations in Road, Railway and Airfield Bearing Capacity – Volume 1 comprises the first part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.
Book Synopsis Laboratory Evaluation of Friction Loss and Compactability of Asphalt Mixtures by :
Download or read book Laboratory Evaluation of Friction Loss and Compactability of Asphalt Mixtures written by and published by . This book was released on 2012 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study aimed to develop prediction models for friction loss and laboratory compaction of asphalt mixtures. In addition, the study evaluated the effect of compaction level and compaction method on skid resistance and the internal structure of asphalt mixtures. The predictive model for friction loss was developed based on parameters that describe aggregate texture and angularity before and after polishing, aggregate gradation, and polishing cycles in the laboratory. Squared-shape slabs of asphalt mixtures were prepared in the laboratory using a linear kneading compactor and polished using a wheel-polishing device. The frictional characteristics were measured after different intervals of polishing cycles. Mixtures with coarser aggregate gradation were found to have better skid resistance than those with fine aggregate gradation. The friction loss model was found to correlate very well with the experimental measurements. The predictive model for laboratory compaction of asphalt mixtures was developed based on parameters that describe aggregate shape characteristics, aggregate gradation, binder content, and binder properties at compaction temperatures. The researchers executed intensive laboratory experiments to quantify the effect of these parameters on the compaction of asphalt mixture in the laboratory. Two models that describe slope and intercept of the laboratory compaction curves of asphalt mixtures were developed. These models showed strong correlations between the predicted values and the measured ones. These models provide essential inputs to quantify the compaction effort needed to compact asphalt mixtures. In the last phase of this study, the researchers evaluated the effect of compaction level and compaction method on skid resistance and internal structure of asphalt pavements. The vibratory roller was found to yield a smoother surface than the static roller. In addition, the results confirmed that the vibratory roller was more effective in reducing the air voids than the static roller. Moreover, the test sections compacted using the vibratory roller had more uniform air void distribution compared to the test sections compacted using the static roller.
Book Synopsis Superpave Mix Design by : Asphalt Institute
Download or read book Superpave Mix Design written by Asphalt Institute and published by . This book was released on 2001-01-01 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Impact of Aggregate Gradation and Type on Asphalt Mixture Characteristics by : Darren Glenn Hazlett
Download or read book Impact of Aggregate Gradation and Type on Asphalt Mixture Characteristics written by Darren Glenn Hazlett and published by . This book was released on 1990 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis addresses the impact of aggregate gradation and type on Hot Mix Asphaltic Concrete (HMAC) characteristics. Several different, but related topics are covered and results from several experiments are presented. An overview of HMAC is presented, covering factors affecting mixture characteristics and performance in addition to a review of the literature relating to aggregate gradation and type. The results of a study of construction data from the Texas State Department of Highways and Public Transportation (SDHPT) are presented. Two laboratory studies were conducted relating to asphalt content, aggregate gradation and aggregate type. The summarized results and interpretations of these results are included. The economic impact of specifications changes currently proposed by the SDHPT to improve HMAC quality is addressed. Finally, conclusions and recommendations are drawn based on all preceding material.
Book Synopsis The Effect of Aggregate Type and Mix Design on the Wet Skid Resistance of Bituminous Pavement by : David Crenshaw Mahone
Download or read book The Effect of Aggregate Type and Mix Design on the Wet Skid Resistance of Bituminous Pavement written by David Crenshaw Mahone and published by . This book was released on 1995 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report (1) identified and characterized Virginia's nonpolishing aggregates in terms of their wet skid resistance, (2) compared the standard ASTM E 274-90 skid test to the British Accelerated Polishing Machine (BAPM) and British PendulumTester (BPT) system for pre-evaluating the skid resistance of nonpolishing aggregates, (3) compared the effect of different asphalt mixtures on pavement surface macrotexture using the ASTM E 965-87 sand patch method, and (4) briefly considered the effect of texturing on pavement surface friction. Recommendations for Virginia's Wet Accident Reduction Program (WARP) were drawn up from the results of these studies. Fifty-seven sources of nonpolishing aggregates, representing 18 lithologies, were studied. Skid testing of the 18 lithologies was carried out on 1,246 bituminous pavements, using the ASTM E 274-90 procedure. The aggregate groups showing the highest wet friction ranking were Valley Gravel, Fine Grained Granite, Lovingston Granite, Coastal Plain Gravel, and Diabase. Aggregates consistently exhibiting the lowest skid resistance were Aplite, Arch Marble, Slate, and Triassic Hornfels. The BAPM-BPT system showed little correlation with the skid test results. No significant differences were found between the overall skid numbers generated on 1-2 and S-5 asphalt mixes, but two trends were noted: 1) 1-2 pavements showed a faster decrease in skid resistance than S-5 pavements as accumulated traffic increased, and 2) where platy aggregates such as Slate and Arch Marble were used, S-5 pavements exhibited consistently higher long-term skid resistance than 1-2 pavements. One hundred and five sand patch tests were conducted to measure pavement surface macrotexture during the study. Macrotexture depth showed a higher correlation with skid numbers than any other factor investigated. Mixes exhibiting low skid resistance may do so because of rapid aggregate wear or the tendency of platy aggregate to orient horizontally, which both lower macrotexture depth. A brief survey of the effect of texturing suggests that Virginia's WARP should consider including pavement texturing as an alternative to repaving for wet accident hot spots.
Book Synopsis Airfield and Highway Pavement 2013 by : Imad L. Al-Qadi
Download or read book Airfield and Highway Pavement 2013 written by Imad L. Al-Qadi and published by . This book was released on 2013 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of the 2013 Airfield & Highway Pavement Conference: Sustainable and Efficient Pavements, held in Los Angeles, California, June 9-12, 2013 contains 123 peer-reviewed papers that focus on the latest developments and cutting-edge technological improvements in pavements and pavement sustainability. Topics include: advanced modeling, design, and analysis of pavements; construction and rehabilitation techniques; asphalt characterization and testing; recycling materials in pavements; pavement quality control/quality assurance; pavement sustainability and life-cycle assessment; nondestructive testing and evaluation; pavement management systems; and airfield and pavement case studies. This proceedings will be of interest to researchers, designers, project/construction managers, and contractors.
