What is the percentage of hydrated lime and water in a slurry HMA mix?

In a slurry Hot Mix Asphalt (HMA) application, the percentage of hydrated lime typically used in conjunction with water is crucial for achieving the desired properties of the mix. The correct answer indicates a ratio of 1 part hydrated lime to 3 parts water, which is a common proportion used in practice. This mixture is designed to ensure adequate dispersion of the lime, enhancing the adhesion between asphalt and aggregates, improving overall performance, and increasing resistance to moisture damage.

The chosen ratio allows for effective hydration and activation of the lime, which contributes to the chemical reactions that improve the durability and longevity of the asphalt mix. Such a mixture is particularly beneficial in preventing stripping, where water separates asphalt from aggregates, thereby maintaining the integrity of the pavement.

Understanding this ratio and its implications in slurry HMA mixes is essential for practitioners to achieve optimal performance in pavement applications.