Effects of Anti-Stripping Additives on Moisture Sensitivity of Warm Porous Asphalt Mixtures
Presence of water in porous asphalt pavement may lead to adhesive failure at binder-aggregate interface and cohesive failures within the binder-filler mastic which attribute to stripping. This paper presents the effects of porous asphalt incorporating Sasobit® prepared with hydrated lime and a newly developed anti-stripping known as Pavement Modifier (PMD). Specimens were compacted at various temperatures and tested on air voids, coefficient of permeability and the indirect tensile strength test (ITS) for dry and conditioned specimens. The resistance to moisture damage was determined from the ratio of dry and conditioned specimens. It was found that, specimens prepared with PMD exhibits better tensile strength and greater resistance to moisture damage at 125°C compared to specimens prepared with hydrated lime. The decreasing of compaction temperature significantly decreases ITS value but increased the air voids and coefficient of permeability. Increase of air voids resulted in a decrease of resistance to moisture damage. Therefore, incorporating PMD filler in porous mixes has improved moisture damage compared to those specimens incorporating hydrated lime.
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