United States Department of Transportation
i
Hydrated Lime and Liquid Anti-Strip Additives: Moisture-Induced Damage Resistance Study
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2024-02-01
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[PDF-9.38 MB]
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Edition:Final Report January 2022 - February 2024
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Abstract:Stripping is a critical surface and or subsurface pavement distress affecting asphalt pavements and is caused by moisture infiltration and stressed by freeze-thaw cycles and traffic loading, leading to the loss of bond or adhesion between the aggregate and the asphalt binder. UDOT has used 1 percent hydrated lime by slurry pugmill mixing in all our asphalt mixtures since the early 90s. The use of hydrated lime has since eliminated almost all performance issues caused by stripping. Industry representatives have asked if modern binder additives could replace the use of hydrated lime slurry in our mixtures. This study demonstrated the increased value of hydrated lime over the suggested liquid anti-strip additives. The study included testing four asphalt mixtures using the AASHTO T 283 Lottman Test, with 5 freeze-thaw cycles. All four mixtures showed excellent stripping resistance when treated with hydrated lime, testing on average 25 percent better than no additive. Two asphalt mixtures showed lesser improvements in stripping resistance when treated with the liquid additives instead of hydrated lime. Two mixtures did not show improved stripping resistance when treated with the liquid-additives.
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