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

This study was conducted to analyze and reform the anti-icing porous asphalt (AIPA) mixture, which was prepared using 4wt% of anti-icing filler (AIF) by replacing mineral filler. The AIF is a chemical material, which has a fine gradation identical to the mineral filler and is slowly consumed by reacting with water to generate heat in the pavement. Therefore, since the AIPA without mineral filler showed weak performance due to poorer asphalt-aggregate binding power, an experimental study was conducted for reforming AIPA by adding 2~4% of mineral filler in addition to using 3 wt% of AIF, with maintaining 16% or higher effective air void ratio and 6 wt% of asphalt content. The hydrated lime (HL) was used for stripping control as a filler material in addition to limestone powder (LP). The deformation strength (S_D), indirect tensile strength under dry (ITS_dry) and wet (ITS_wet) conditions, tensile strength ratio (TSR), and Contabro loss (CL) were evaluated for various AIF-LP-HL (A:L:H) ratios. The AIPA mix with 4 wt% AIF without filler showed the poorest performance in the five-property test results, but the performance was improved in all five-property tests by increasing filler ratio. The excellent performance was achieved by using (A:L:H) ratios of (3:3:1) and (3:2.5:1.5). These mixes showed 66% and 106% increases in S_D and ITS_wet, respectively. The TSR was improved to be 0.89, on average, from 0.67, and CL was reduced down to 18.45%, on average, from 43.4% at –20°C, compared with the AIAP mix with 4 wt% AIF without filler. Therefore, it was found that the AIAP mix without filler was obviously improved by increasing filler material ratio up to 4% in all five performance test results.