Laboratory Evaluation of Foamed Asphalt Stabilized Base Materials

摘要

Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement and/or recycled concrete with a binder. The pavement structural properties of the FASB material created by this process falls somewhere between conventional untreated graded aggregate base and hot mix asphalt. Mix designs were developed for six different combinations of aggregate types. Details of the mix design procedures, including the associated foamed asphalt and mixture tests, are provided along with a discussion of appropriate curing and soaking procedures and the effects of additives, mixing moisture content (MMC), compaction moisture content (CMC), and material storage after mixing. Higher indirect tensile strengths (ITS) in both soaked and unsoaked conditions were obtained in mixes containing recycled concrete and/or cement and that were compacted at 90% of optimum moisture content (OMC) immediately after mixing followed by curing at 40°C for 72 hours. MMC and the fines percentage did not significantly affect strength.