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Title:

TWO-DIMENSIONAL FINITE DIFFERENCE TECHNIQUES APPLIED TO TRANSIENT TEMPERATURE CALCULATIONS IN HOT-MIX ASPHALT CONCRETE WINDROWS

Accession Number:

00215688

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309021871

Abstract:

THE APPLICATION OF FINITE-DIFFERENCE TECHNIQUES TO A PROBLEM IRRESOLVABLE BY ANALYTICAL METHODS, REVEALED SIGNIFICANT QUANTITATIVE INFORMATION ABOUT COOLING RATES OF HOT-MIX ASPHALT CONCRETE WINDROWS UNDER VARIED ENVIRONMENTAL CONDITIONS. THIS STUDY CALCULATES THE CHANGES WITH TIME IN AVERAGE BULK TEMPERATURE OF SUCH WINDROWS OF DIFFERENT SIZES AND INITIAL TEMPERATURES UNDER THE FOLLOWING ENVIRONMENTAL CONDITIONS: THE BASE MATERIAL TEMPERATURE, THE AMBIENT TEMPERATURES, THE NET ABSORBED SOLAR RADIATION, AND THE WIND VELOCITY. THE ANALYTICAL SOLUTION OF THE MATHEMATICAL MODEL DESCRIBING THE WINDROW AND ITS IMMEDIATE SURROUNDINGS CANNOT BE OBTAINED. THEREFORE, THE APPROACH USED WAS A 2-DIMENSIONAL TRANSIENT HEAT BALANCE MODEL FORMULATED BY EXPLICIT FINITE-DIFFERENCE TECHNIQUES IN FORTRAN-IV. THE RESULTS OF THE FINITE-DIFFERENCE SOLUTION WERE THOSE READILY PREDICTED BY THE LAWS OF HEAT TRANSFER. THE MOST SIGNIFICANT VARIABLE AFFECTING THE COOLING RATES WAS THE SIZE OF THE WINDROW. THE LARGE WINDROWS, HAVE A LOWER SURFACE-TO-VOLUME RATIO THAN SMALLER WINDROWS, WERE LESS AFFECTED BY ALL ENVIRONMENTAL CONDITIONS (THE MOST SEVERE CASE USED WAS 10 F BASE TEMPERATURE, 10 F AMBIENT TEMPERATURE, OVERCAST DAY, AND STILL WIND), THE TEMPERATURE DROP AFTER 30 MINUTES WAS 67 F FOR A 2- BY 1-FT WINDROW BUT ONLY 24 F FOR A 6- BY 3-FT WINDROW. THE COMPUTER PROGRAMS DEVELOPED IN THE STUDY MAY BE USED TO CALCULATE BULK TEMPERATURE VERSUS TIME CURVES FOR AN ALMOST LIMITLESS NUMBER OF COMBINATIONS OF WINDROW SIZES, INITIAL TEMPERATURES, ENVIRONMENTAL CONDITIONS, AND COOLING TIMES.

Supplemental Notes:

Publication of this paper sponsored by Committee on Flexible Pavement Construction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.

Monograph Title:

Construction

Monograph Accession #:

01410367

Authors:

Fishback, J W
Dickson, P F

Pagination:

pp 32-38

Publication Date:

1973

Serial:

Highway Research Record

Issue Number: 454
Publisher: Highway Research Board

Conference:

52nd Annual Meeting of the Highway Research Board

Location: Washington District of Columbia, United States
Date: 1973-1-22 to 1973-1-26

ISBN:

0309021871

Media Type:

Digital/other

Features:

Figures (5) ; References (1) ; Tables (1)

Old TRIS Terms:

Subject Areas:

Construction; Geotechnology; Highways

Files:

TRIS, TRB

Created Date:

Jun 5 1974 12:00AM

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