24 May 2014
Hydrated lime has been known as an additive for asphalt mixtures from their very beginning. It experienced a strong interest during the 1970s in the USA, when moisture damage and frost became some of the most pressing pavement failure modes of the time.
Given its extensive use in the past 40 years in the USA, hydrated lime has been seen to be a multifunctional additive for asphalt mixtures:
- it improves moisture damage and freeze-thaw resistance,
- it reduces chemical ageing of the bitumen
- it improves the mechanical properties of the mix.
Given that all the above properties impact the durability of asphalt mixtures, road managers report that hydrated lime increases durability by 25%.
This paper explains why hydrated lime is so effective in asphalt mixtures.