From both economical and ecological points of view, cold recycling is much more beneficial than hot recycling. However, due to not only the intrinsic properties of binding mechanisms but also the difficulties of process control, cold recycling did not gain common acceptance in Taiwanese paving industries. For the further development of environment-friendly paving materials and construction processes, this particular study investigated the engineering properties of foamed-asphalt-treated bases in Taiwan. Using a laboratory foaming plant, work was performed on local materials to produce foamed-asphalt-treated cold mixtures. The engineering properties of foamed-asphalt-treated mixes were tested and compared with those of hot recycled mixes. Test results show the benefits of utilizing high percentages (80%) of milled asphalt in foamed asphalt mixes. The optimum asphalt content of foamed asphalt mixes can be reduced from 3.5 to 2.0%, which is less than the mixes consisting of all new aggregate, and the moisture resistance of the mixture is enhanced. Resilience modulus and fatigue data show that foamed-asphalt-treated mixes perform as well as hot recycled mixes.
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