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Author: William H. Parcells
Publisher:
ISBN:
Category : Motor vehicles
Languages : en
Pages : 36
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Book Description
Develops and refines methods for pre-evaluating aggregates and paving mixtures so that predictions can be made covering skid resistance properties of proposed and in service pavement types.
Author: William H. Parcells
Publisher:
ISBN:
Category : Motor vehicles
Languages : en
Pages : 36
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Book Description
Develops and refines methods for pre-evaluating aggregates and paving mixtures so that predictions can be made covering skid resistance properties of proposed and in service pavement types.
Author: Sand Aldagari
Publisher:
ISBN: 9781369538816
Category : Pavements, Asphalt
Languages : en
Pages : 256
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Book Description
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.
Author: Arash Rezaei
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1108
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Book Description
Author: Rudolph Reuven Hegmon
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 184
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Book Description
A correlation has been established between skid resistance measurements with the newly adopted test tire (ASTM E501) and the previous standard test tire (ASTM E249). The correlation is based on a large scale field test program, supported by laboratory tests on a high speed facility. Both tires respond in a similar way to changing test conditions, but tire E501 is expected to measure about 4 percent higher than tire E249 under standard test conditions at 40 mph. Prediction equations and the associated estimated variances are given for an all-inclusive correlation, as well as separate equations for three speeds (20, 40, and 60 mph) and separate equations for each of the four pavements used in this program. Limited tests on dry pavements also show generally higher readings with tire E501.
Author:
Publisher:
ISBN:
Category : Motor vehicles
Languages : en
Pages : 76
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Book Description
Author:
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 230
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Book Description
Report on the activities of the National Highway Traffic Safety Administration and the Federal Highway Administration under the Highway Safety Act of 1966.
Author:
Publisher: AASHTO
ISBN: 1560514280
Category : Pavements
Languages : en
Pages : 87
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Highway research
Languages : en
Pages : 52
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Book Description
Author: United States. National Highway Traffic Safety Administration
Publisher:
ISBN:
Category : Automobiles
Languages : en
Pages : 224
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Book Description
