Increasing the Durability of Asphalt Mixture Against Moisture: A Case Study in Iran

Background: Hydrated Lime (HL) has been known as an additive for asphalt mixture durability. It is observed to be the most effective additive when moisture damage becomes one of the most pressing pavement failure modes. Methods: The use of HL is a known technique to increase durability and decrease stripping phenomena in asphalt mixtures. In this research, we intended to study the effect of adding HL, by presenting laboratory examinations on different aggregates using with one percent of HL additive and investigating the changes in some main HMA design factors. Results: Test results have been used in Zanjan-Tabriz highway (section 9), which is the longest freeway of Iran. Texas boiling water test (ASTM D3625) was used as a primary investigation of aggregate trend to stripping and Lottman test (AASHTO T283) for testing the indirect tensile strength of asphalt mixtures. Asphalt Mixture durability against moisture was evaluated by TSR ratio, MRR and fatigue index. Conclusion: Results, wholly, confirmed beneficial effects of HL on asphalt mixture durability and stripping Phenomena, for the samples of this project.