Lime is used in hot-mix asphalt as an anti-stripping additive and as mineral filler. In the United states, numerous state transportation departments have found that incorporating hydrated lime into hot-mix asphalt adds years to the life of a highway, thus making the addition very cost-effective.
The addition of hydrated lime can reduce stripping, rutting, cracking and aging. Hydrated lime substantially improves each of these properties when used alone, and also works well in conjunction with polymer additives, helping to create pavement systems that will perform to the highest expectations for many years.
Lime is also used to upgrade marginal aggregates. In addition to the chemical effects that reduce stripping potential and the aging impact resulting from oxidative hardening, the filler effect improves resistance to high-temperature rutting and adds fracture toughness at low temperatures.