Road agencies and road owners are often looking for solutions to decrease their maintenance costs, and therefore their lifecycle costs. As a result, they typically look at the quality parameters that affect the lifetime of the road.
As pavements age, cracking often begins with the formation of microcracks. These then coalesce to form pavement-damaging macrocracks. Hydrated lime particles reduce cracking, as the lime reacts with elements within the bitumen, forming larger pieces that are better able to intercept and deflect microcracks. This prevents microcracks from growing into the larger cracks that contribute to pavement failure.
North American state road agencies estimate that hydrated lime increases the durability of asphalt mixtures from 20 to 50% in lifetime. In Europe, French road managers have suggested that the beneficial effects of hydrated lime increase durability by 25%, in terms of wearing course service life expectancy. By this concept of using hydrate in asphalt layers, the carbon footprint of road construction can be reduced by 23%. (Source: EuLA)