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Title: RESILIENT MODULUS PROPERTIES OF ASPHALT RUBBER MIXES FROM FIELD DEMONSTRATION PROJECTS IN MARYLAND
Accession Number: 00714837
Record Type: Component
Availability: Find a library where document is available Abstract: Results of resilient modulus (M sub r) response obtained from field cores of a newly constructed Maryland State Highway Administration demonstration project concerning the performance of asphalt rubber mixtures are presented. The test project involves over 12.5 km of US-340 and MD-140 highways, contains 30 test sections, and utilizes 14 different mixtures (1 conventional control mix and 13 rubber mixes). Six types of plant-blended wet process asphalt rubber mixtures, two types of manufacturer preblended asphalt rubber (Neste SAR and Bitumar Ecoflex), two types of dry process patented Plus Ride, and three types of a generic dry process rubber-modified mix were evaluated. The analysis of 180 field cores with the Baladi indirect test fixture with three transducer directions is presented. In addition to describing the results of the M sub r test program for all of the mixtures investigated, statistical analysis of variance (ANOVA) studies were conducted to evaluate field core horizontal anisotropy, compare among the five M sub r prediction models currently available, and quantify five sources of variance associated with the M sub r field evaluation program. It was found that no horizontal anisotropy is present in field cores. Another study conclusion was the fact that the assumption of a Poisson's ratio value when using only horizontal or longitudinal transducers yields statistically different results for the M sub r response compared with models that calculate the Poisson's ratio based on both vertical and horizontal deformations or models that use only the vertical measurements in conjunction with an assumed Poisson's ratio. Finally, the component variance analysis indicated that the largest source of variability is associated with the orientation of the diametral plane during the M sub r test. This variance was found to be greater than even the within-section, between-section, and between-mix sources of variability.
Supplemental Notes: This paper appears in Transportation Research Record No. 1492, Hot-Mix Asphalt Design, Testing, Evaluation, and Performance. 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: Hot-mix asphalt design, testing, evaluation, and performance Monograph Accession #: 01399807
Language: English
Authors: Ayres Jr, MWitczak, M WPagination: p. 96-107
Publication Date: 1995
Serial: ISBN: 309061563
Features: Figures
(8)
; References
(4)
; Tables
(7)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Data and Information Technology; Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Dec 4 1995 12:00AM
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