Journal of the Korean Asphalt Institute ISSN:2234-0785(Print) 2635-9553(Online) 한국아스팔트학회지

Waste glass bottles are usually reused as glass bottles again after screening, cleaning and/or crushing and melting for recycling purpose. The glass aggregate (GFA) can be used in replace of natural fine aggregate (NFA) as construction material like as production of asphalt mixtures. In USA and Europe, the GFA, which was produced from crushed waste glass bottles, have been used for making asphalt mixtures under the name of the Glassphalt. Recently, Korea Circulation Resource Distribution Center and Construction & Transportation Business Division conducted a study to replace 50% of NFA with GFA to produce asphalt mixture. In this study, the performance test of the GFA asphalt mixture to apply for the base course was carried out. Deformation strength (S_D) was performed to evaluate the rutting resistance. The moisture sensitivity was evaluated by the deformation strength ratio (S_DR) test and tensile strength ratio (TSR), and the indirect tensile strength (ITS) was measured to evaluate the crack resistance. As are results, S_D and ITS of GFA asphalt mixture for base layer showed similar to the normal hot-mix asphalt (HMA) mixture. S_DR was also similar to HMA. The mixture containing the GFA showed similar properties for rutting resistance, crack resistance, and moisture susceptibility as compared to normal HMA, and was satisfied the criterion of base layer specifications. However, It is consider that the absorption rate of GFA is closed to zero, so that the asphalt cannot be absorbed to the GFA during the production of the asphalt mixture. This is the source of low bonding strength of the mixture, resulting in reduced stripping and rutting resistances. Therefore it was judged that additional measure should be taken to use the GFA asphalt mixture in surface layer.