Field Evaluation of Cold In-Place Recycling of Asphalt Concrete, HR-303, 1993

(1993) Field Evaluation of Cold In-Place Recycling of Asphalt Concrete, HR-303, 1993. Transportation, Department of

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Abstract

The average thickness of the existing asphalt cement concrete (ACC) along route E66 in Tama County was 156 mm (6.13 in.). The rehabilitation strategy called for widening the base using the top 75 mm (3 in.) of the existing ACC by a recycling process involving cold milling and mixing with additional emulsion/rejuvenator. The material was then placed into a widening trench and compacted to match the level of the milled surface. The project had the following results: (1) Cold recycled ACC pavement provided adequate pavement structure for a low volume road; (2) Premature cracking of the ACC in the widened pavement area was caused by compaction of the mix over a saturated subgrade; and (3) Considerably less transverse and longitudinal cracking was observed with 75 mm (3 in.) of cold recycled ACC and a 50 mm (2 in.) hot mix ACC overlay than with a conventional hot mix overlay with no cold recycling. More research should be done on efficient construction procedures and incorporating longer test sections for proper evaluation.

Item Type: Departmental Report
Keywords: Asphalt pavements, Cold in-place recycling, Cold weather, Driver rehabilitation, Low volume roads, Milling, Pavement cracking, Pavement widening, Recycling, Rehabilitation
Subjects: Transportation > Pavements
Transportation
Transportation > Research
Transportation > Research > Concrete
Transportation > Design and Construction
ID Code: 16067
Deposited By: Iowa DOT Library
Deposited On: 11 Feb 2014 13:08
Last Modified: 22 Sep 2014 11:43
URI: http://publications.iowa.gov/id/eprint/16067