Comparison of Winter Temperature Profiles in Asphalt and Concrete Pavements PDF Download
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Author: Jeremy Brooks Dye
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Book Description
The regression equation predicting the number of subsurface freeze-thaw cycles provided estimates that did not correlate well with measured values. Consequently, an entirely different analysis must be conducted with different input variables. Data that were not available for this research but are likely necessary in estimating the number of freeze-thaw cycles under the pavement include pavement layer thicknesses, layer types, and layer moisture contents.
Author: Jeremy Brooks Dye
Publisher:
ISBN:
Category :
Languages : en
Pages : 74
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Book Description
The regression equation predicting the number of subsurface freeze-thaw cycles provided estimates that did not correlate well with measured values. Consequently, an entirely different analysis must be conducted with different input variables. Data that were not available for this research but are likely necessary in estimating the number of freeze-thaw cycles under the pavement include pavement layer thicknesses, layer types, and layer moisture contents.
Author: Jeremy Brooks Dye
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 74
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Book Description
The regression equation predicting the number of subsurface freeze-thaw cycles provided estimates that did not correlate well with measured values. Consequently, an entirely different analysis must be conducted with different input variables. Data that were not available for this research but are likely necessary in estimating the number of freeze-thaw cycles under the pavement include pavement layer thicknesses, layer types, and layer moisture contents.
Author: J. S. Corlew
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Hui Li
Publisher: Butterworth-Heinemann
ISBN: 0128034963
Category : Technology & Engineering
Languages : en
Pages : 389
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Book Description
About 90 percent of this excessive heat is due to buildings and pavements that absorb and store solar heat (According to the Green Buildings Council). The only reference that focuses specifically on pavements, Pavement Materials for Heat Island Mitigation: Design and Management Strategies explores different advanced paving materials, their properties, and their associated advantages and disadvantages. Relevant properties of pavement materials (e.g. albedo, permeability, thermal conductivity, heat capacity and evaporation rate) are measured in many cases using newly developed methods. Includes experimental methods for testing different types of pavements materials Identifies different cool pavement strategies with their advantages and associated disadvantages Design and construct local microclimate models to evaluate and validate different cool pavement materials in different climate regions
Author: Robert Kenneth Wolfe
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 116
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Book Description
The application of elastic theory to the design of overlays on existing pavement requires that a modulus of elasticity be assigned to the existing structural system. Estimates of elastic modulus are obtained from dynamic deflection reading in the field; but asphalt is a highly temperature-sensitive visco-elastic material and deflections not corrected to a standard temperature can produce misleading results. It is therefore the objective of the present study to develop a procedure for estimating an effective modulus of elasticity for a layer of asphaltic concrete in which some temperature gradient exists because of the combined influences of solar radiation, wind, air temperature, cloud cover and other variables specific to time and location which cause temperature variation within the pavement layer. Two models are presented from the achievement of that objective.
Author: Dong Wang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Accurate prediction of pavement temperature profile is essential to better characterize the mechanistic properties of paving materials and predict pavement responses under traffic and environmental loadings. In practice, characterizing the field temperature profiles are desired in order to calculate the moduli of various pavement layers, analyze Falling Weight Deflectometer (FWD) testing data, as well as assess the load transfer efficiency across joints in concrete pavements. To facilitate estimation of pavement temperature profiles, one-dimensional (1-D) analytical solutions for temperature profiles in multi-layered pavements have been derived using the method of separation of variables and the Laplace transforms. The derived theoretical solutions consider the pavement geometries, material thermal properties, solar radiation, and air temperature. Field validation justified that these analytical solutions generate reasonable temperature profiles in the concrete slab of a four-layered continuously reinforced concrete pavement (CRCP) test section. The main advantages of these solutions are that they can rapidly predict the pavement temperature profile for short time durations, e.g., a few days, with limited input data. Under the assumption of axisymmetric thermal conditions, analytical solution for two-dimensional (2-D) temperature profiles in a multi-layered pavement system has been derived using the Hankel transform and the method of separation of variables, and validated for predicting the temperature profile in the concrete slab of a four-layered CRCP test section. Finally, rapidly varying temperature profiles in pavement systems due to transient thermal loadings generated by vertical take-off aircraft engines are systematically studied. 1-D analytical solutions for temperature fields in a two-layered pavement system using Laplace transforms are proposed for two different surface boundary conditions, i.e., specified transient surface temperature and mixed boundary condition involving heat flux emanating from the aircraft engine. Furthermore, 2-D axisymmetric temperature field in a homogeneous half-space subjected to transient thermal loading was solved using the specified surface temperature condition. Two solution methods, one based on the Hankel transforms and the method of separation of variables while another based on the Hankel and Laplace transforms, were introduced. Numerical experiments suggest that the combined results based on those two methods give reasonable approximation to the rapidly varying temperature profile.
Author: Asphalt Institute
Publisher:
ISBN: 9781934154175
Category : Asphalt
Languages : en
Pages : 102
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Book Description
Author: Per Just Andersen
Publisher:
ISBN:
Category : Concrete
Languages : en
Pages : 118
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Book Description
This report describes the use of tables developed to help determine problems that may result from early thermal effects in concrete. The thermal behavior of concrete can be estimated from a knowledge of concrete temperature, air temperature, type of cement, and content of cement in the mixture. The thermal effects tables can be used to predict whether too high a temperature will be reached in the pavement; whether early thermal cracking will result from larger differences between the temperature of the concrete slab and the temperature of either the air or the base; or whether there is a risk of early cracking of the concrete. Examples of the use of the table are given along with guidelines for avoiding undesirable thermal effects.
Author: José Ludwig Figueroa
Publisher:
ISBN:
Category : Pavements
Languages : en
Pages : 172
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Book Description
The performance of asphalt concrete pavements is in part affected by the seasonal variations of the resilient modulus of the AC layer and of the subgrade soil. To determine the variation of these parameters throughout Ohio, seven moisture-temperature-rainfall recording stations, previously installed during an Ohio Department of Transportation-funded project, and two additional ones installed during this project, were monitored for an additional period of 2-1/2 years, These stations, located to include various climatic zones and the four most common soil types within the state, recorded air, asphalt concrete and subgrade soil temperature, rainfall and moisture content (or degree of saturation) of the subgrade soil on a two-hour basis. Recorded data led to the development of polynomial equations to calculate the average asphalt concrete pavement temperature from the air temperature and to the division of the state into three temperature zones: Northern, Central and Southern. Recorded depths of frost penetration indicated average depths of 45 to 61 cm. within the southern zone and of 70 to 52 cm. within the northern zone. Similarly, the northern and the southern zones experience an average of 7 to 12 and 4 to 5 freeze-thaw cycles, respectively. The degree of saturation calculated from moisture and temperature sensor readings varied form about 90% to 100% throughout the monitoring period. The late spring to early summer consistently led to a higher degree of saturation at all depths. Finally, a method to back calculate the resilient modulus of subgrade soils (Eri) at the break point from measured FWD deflections was developed. Seasonal averages of this modulus were obtained at each of six station locations where FWD testing was conducted. Seasons were ranked in terms of expected higher resilient modulus. The designated "fall" testing period (early fall) showed the highest followed by "summer," "winter" and "spring" in decreasing order. Determined monthly and seasonal variation of material properties will find immediate application as inputs in mechanistic-empirical pavement design procedures.
Author: John W. Henault
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 170
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Book Description
