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Title:

THEORETICAL ASPHALTIC CONCRETE EQUIVALENCES

Accession Number:

00205732

Record Type:

Component

Abstract:

THEORETICAL ASPHALTIC CONCRETE EQUIVALENCES WERE CALCULATED ON A CONTINUOUS HOURLY OR FOURTH HOURLY BASIS FOR A 245-DAY PERIOD. FOR THESE CALCULATIONS EQUIVALENCE WAS DEFINED AS THAT THICKNESS OF BASE NECESSARY TO REPLACE ONE INCH OF SURFACING FOR EQUAL DEFLECTION. DEFLECTIONS WERE CALCULATED USING THE LAYER ELASTIC THEORY AND THE RESULTS OF STATIC AND DYNAMIC LAB TESTS OF THE PAVEMENT MATERIALS IN THE FREQUENCY DOMAIN. THE MATERIALS INVESTIGATED WERE TWO ASPHALTIC CONCRETE SURFACINGS AND THREE ASPHALTIC CONCRETE BASES. THE EFFECT OF TESTING SPECIMENS WITH H/D RATIOS OF LESS THAN TWO WAS INVESTIGATED. THE SUB-GRADE WAS THAT DETERMINED FROM THE 1960 TRENCHINGS AT THE AASHO ROAD TEST AND THE CONTINUOUS HOURLY TEMPERATURE DATA WERE THOSE REPORTED BY THE ASPHALT INSTITUTE. CONTINUOUS 19-KIP SINGLE-AXLE LOADINGS MOVING AT 50 MPH WERE ASSUMED FOR THE PRINCIPAL CALCULATIONS. THE EFFECTS OF DIFFERENT LOADINGS WERE EXAMINED AS FUNCTIONS OF WEIGHT, SPEED, TIME, AND CONTACT AREA TOGETHER WITH THE EFFECTS OF DIFFERENT SUBGRADES AND LAYER THICKNESSES. IT WAS CONCLUDED THAT THERE IS NO UNIQUE EQUIVALENCE AND THAT THE INCLUSION OF A FAILURE TERM IS NECESSARY TO THE THEORETICAL CALCULATION OF EQUIVALENCE FOR GIVEN MATERIALS, ENVIRONMENT AND LOADINGS. /AUTHOR/

Supplemental Notes:

Paper sponsored by Committee on Flexible Pavement Design. 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 Accession #:

01410183

Authors:

Coffman, Bonner S
Ilves, George
Edwards, William

Pagination:

pp 95-119

Publication Date:

1968

Serial:

Highway Research Record

Issue Number: 239
Publisher: Highway Research Board

Media Type:

Print

Features:

Figures (14) ; References (17) ; Tables (7)

Uncontrolled Terms:

Computation

Old TRIS Terms:

Subject Areas:

Highways; Pavements

Files:

TRIS, TRB

Created Date:

Jan 31 1994 12:00AM

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