PURPOSES : This study was conducted to evaluate the physical properties of micro-foamed asphalt binders. Surfactants and water-soluble anti-stripping agent were used to improve the performance of the foamed asphalt binder, and a domestically developed foamed asphalt generator was used for the micro-foamed asphalt binder. The results of this study can be used as technical data for the domestic application of foamed asphalt technology. METHODS : To evaluate the physical properties of the micro-foamed asphalt binder, basic properties such as penetration, viscosity, softening point, and ductility were evaluated. Additionally, DSR and BBR tests were performed to confirm the change in the performance grade of the micro-formed asphalt binder when using surfactants, water-soluble anti-stripping agent, and water. RESULTS : Of the results of evaluating the physical properties of the micro-foamed asphalt binder containing surfactant confirmed that the kinematic viscosity was reduced by 12.5% compared with the straight asphalt binder, which indirectly confirmed that compaction is possible even at low temperatures when producing the asphalt mixture. In addition, the PG grade of straight asphalt and micro-foamed asphalt binder was PG 64-22. This result indicates that surfactants, water-soluble anti-stripping agent, and water did not significantly affect the PG grade of the asphalt binder. CONCLUSIONS : The properties of the micro-foamed asphalt binder were confirmed through the evaluation of the physical and rheological properties of the foamed asphalt binder to which the surfactant and water-soluble anti-stripping agent were applied, and we determined that it can be used as a technical material for the revitalization of Korean foamed asphalt technology.

PURPOSES : This paper presents a quality evaluation of Korean foamed asphalt, which uses the maximum expansion ratio and half-life method. The maximum expansion ratio and half-life method are used to determine the optimum water content to produce a foamed asphalt mixture. The foamed asphalt mixture according to determine an optimum water content with this method; the mixture quality was compared with hot mix asphalt mixture. METHODS : For the foamed asphalt mixed design, the water content was determined in addition to the Marshall mixing design method. The water content was determined using the ratio of the maximum to minimum volume and the time for the volume to decrease to half of the maximum volume. We conducted stability, indirect tensile strength, tensile strength ratio, dynamic immersion, and absorption rate tests to compare the foamed and hot mixed asphalt mixtures. RESULTS : The foam asphalt mixture exhibited less performance reduction due to temperature change than the hot mixed asphalt mixture. Most of the two mixture types exhibited similar performance. In addition, both mixtures should use an anti-stripping agent to improve water resistance. CONCLUSIONS : As a result of the laboratory test, the foamed asphalt mixture was able to ensure a similar performance to the hot-mixed asphalt mixture.