Evaluation of Cold in-Place Recycled Mixtures on US-283

摘要

The Kansas Department of Transportation (KDOT) cold in-place recycle (CIR)approximately 120 to 160 km of pavement a year as a part of their 1-R maintenance program. Originally KDOT utilized asphalt emulsions (AE) as the additive in CIR mixtures, but based on performance concerns, KDOT currently utilizes type C fly ash. Recent research indicates that the use of CIR with asphalt emulsion and hydrated lime, introduced as ho6t slurry, provides improved performance. KDOT constructed two test sections on US-283 using type C fly ash and CSS-1 with hot lime slurry. Cores from the test sections and samples of the paving materials were obtained and a laboratory evaluation was undertaken to evaluate the performance of CIR mixtures using AE with hot lime slurry, and type C fly ash. Two additional asphalt emulsions were evaluated as well, CMS-1 and HFE-150. The cores and laboratory samples were tested for tensile strength, AASHTO T 283, resilient modulus and for rutting resistance and moisture damage using the Asphalt Pavement Analyzer (Georgia Rut Tester). Results indicate that the use of hot lime slurry improves the performance of CIR with AE, regardless of the emulsion used and that AE with hot lime slurry could be an alternative to the use of type C fly ash in CIR mixtures.