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Title: EFFECT OF MIXING TEMPERATURE AND STOCKPILE MOISTURE ON ASPHALT MIXTURES
Accession Number: 00459230
Record Type: Component
Availability: Find a library where document is available Abstract: Studies have indicated that mixtures produced in drum plants have workability and short-term performances equal to those of mixtures produced in conventional plants and that long-term performance will be equivalent. This work, however, has led to questions about the effect of lower mixing temperatures and higher aggregate moisture contents. In addition, there is a need for information on the effects of stockpile and asphalt-mixture moisture contents for conventional batch and drum plants for use in developing cost-effective specifications. To determine these effects, the Center for Transportation Research at the University of Texas at Austin and the Texas State Department of Highways and Public Transportation initiated a series of field experiments to evaluate the engineering properties of asphalt mixtures produced with a range of stockpile moisture contents, a range of mixing temperatures, and both drum and conventional batch plants. The first phase of the study, discussed here, involved a variety of aggregate types and different plants in Texas. Mixing temperatures ranged from 175 deg F to 325 deg F and stockpile moisture contents varied from dry to saturated. The engineering properties evaluated were Hveem stability, tensile strength, resilient modulus, and moisture susceptibility characteristics. Essentially, for the studies conducted, there were no significant effects produced by stockpile moisture and mixing temperatures for either batch or drum plants. Both plants were able to remove most of the moisture although this probably increased fuel costs and lowered possible production rates. Density was the major factor that affected the engineering properties and was indirectly related to mixing temperature.
Supplemental Notes: Publication of this paper sponsored by Committee on Characteristics of Bituminous Paving Mixtures to Meet Structural Requirements. 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: Monograph Accession #: 01419475
Authors: Kennedy, Thomas WHuber, Gerald AEditors: Kaplan, Elizabeth WPagination: pp 35-46
Publication Date: 1985
Serial: ISBN: 0309039509
Media Type: Print
Features: Figures
(12)
; References
(6)
; Tables
(2)
TRT Terms: Uncontrolled Terms: Subject Areas: Construction; Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Oct 31 1986 12:00AM
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