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Title: VARIABILITY ANALYSIS OF HOT-MIX ASPHALT CONCRETE CONTAINING HIGH PERCENTAGE OF RECLAIMED ASPHALT PAVEMENT
Accession Number: 00731077
Record Type: Component
Record URL: Availability: Find a library where document is available Abstract: A research project was undertaken to evaluate the production and construction variability of hot-mix asphalt concrete (HMAC) containing large quantities of recycled asphalt pavement (RAP) material. Four construction projects were selected. Two of the projects used 35% RAP material, while the other two used 40% and 50% RAP, respectively. The projects differed in size with total hot-mix ranging from 12,000 to 30,000 tons. In all cases, dedicated RAP stockpiles were used. A series of tests was performed at both the hot-mix plant laboratory and the University of Texas (UT) asphalt laboratory. The tests at the plant included extraction, gradation, and asphalt content using nuclear gauge. A number of specimens were also compacted and shipped to the Texas Department of Transportation Materials and Tests Division for Hveem stability testing. Asphalt recovery, penetration, and viscosity tests for both HMAC and RAP were conducted at the UT laboratory. Each day, four sublots were sampled. The results obtained from the tests were analyzed. The gradation and asphalt content deviations, air voids, penetrations and viscosities, and stabilities were included in the analysis. Pay adjustment factors were determined for gradation and asphalt content deviation, as well as for air voids. In general, these high-percentage RAP projects indicated higher variability than a typical HMAC project without RAP. The gradations of plant-produced mixtures were finer than the job mix formula target gradations, possibly because of aggregate crushing during the milling operation.
Supplemental Notes: This paper appears in Transportation Research Record No. 1543, Design and Construction of Asphalt Overlays and Hot-Mix Asphalt Construction Practices.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Solaimanian, MTahmoressi, MPagination: p. 89-96
Publication Date: 1996
Serial: ISBN: 0309059186
Features: Figures
(14)
; References
(6)
; Tables
(4)
TRT Terms:
Adjustment factors; Aggregate gradation; Air voids; Asphalt content; Asphalt pavements; Chemical analysis; Construction; Hot mix asphalt; Hveem test; Laboratory tests; Nuclear gages; Payment; Production; Recycled materials; Resource extraction; Soil penetration test; Stability (Mechanics); Stockpiling; Variables; Viscosity
Uncontrolled Terms: Old TRIS Terms: Subject Areas: Construction; Finance; Highways; Materials; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings
Files: TRIS, TRB
Created Date: Feb 3 1997 12:00AM
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