USE OF ASPHALT EMULSIONS FOR IN-PLACE RECYCLING: OREGON EXPERIENCE

Author(s)
ROGGE, DF DEPT OF CIVIL ENGINEERING, CORVALLIS, OREGON, USA HICKS, RG DEPT OF CIVIL ENGINEERING, CORVALLIS, OREGON, USA SCHOLZ, TV DEPT OF CIVIL ENGINEERING, CORVALLIS, OREGON, USA ALLEN, D OREGONDEPT OF TRANSPORTATION, BEND, USA
Year
Abstract

An overview of the use of emulsified asphalts for cold in-place recycling (CIR) of asphalt pavements by the Oregon Department of Transportation (ODOT) is presented. Project selection, design, construction, and inspection considerations are presented. ODOT has successfully used both CMS-2S (now called CMS-2RA) and high-float emulsions for recycling. Typical projects have been recycled to depths of 2 to4 in, followed by either a chip seal or an open-graded emulsion mix. A brief overview of the CIR process is followed by a discussion ofproject selection. Finally, a discussion of problems experienced and appropriate preventive and remedial measures is presented. Significant findings include the following: (a) careful project selection is important to CIR project success; (b) the maintenance of proper proportions of emulsion and mix water is the biggest challenge in the field (the estimation procedure presented provides a good starting point and the discussion of construction control provides criteria for adjustments to meet changing field conditions); and (c) excess moisture for construction must be allowed to leave the mat before sealing, which should take place before winter condition.s

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Publication

Library number
I 857859 IRRD 9306
Source

TRANSPORTATION RESEARCH RECORD L20418 WASHINGTON DC USA 0361-1981 REPORT 1992 1342 PAG: 1-8 T6

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