Saskatchewan Highways and Transportation commonly uses hydrated lime and liquid anti-stripping additives to mitigate asphalt-aggregate stripping susceptibility of hot mix asphalt mixes. Based on empirical experience of observed field performance in Saskatchewan, the addition of lime is thought to not only improve stripping resistance, but also the mechanical behaviour of the mix. However, the addition of lime requires adequate voids in the mineral aggregate of the mix, and contractors have the added difficulty of handling lime during construction, making liquid anti-stripping products more appealing. Although the influence lime has on Saskatchewan mixes has been evaluated in the past, none of the investigations involved determining its effect in terms of fundamental mechanistic mix behaviour. This laboratory study investigated the mechanistic behaviour of a typical Saskatchewan hot mix asphalt concrete modified with hydrated lime, with a liquid anti-stripping additive, and without any anti-stripping treatment as control. For the covering abstract of this conference see ITRD number E211426.
Samenvatting