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Synergistic Effect of Hydrated Lime and Warm Mix Asphalt Additive on Properties of Recycled Asphalt Mixture Subjected to Laboratory Ageing

Reclaimed Asphalt Pavement (RAP) is often used with Warm Mix Asphalt (WMA) additive to reduce the production temperature and limit emission at the asphalt plant and worksite. Despite sustainable utilization of RAP, the long-term performance of recycled mix is still quite concerning, and thus researc...

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Bibliographic Details
Published in:International journal of pavement research & technology 2023-07, Vol.16 (4), p.968-982
Main Authors: Mondal, Abhijit, Islam, Sk Sohel, Ransinchung R.N., G. D.
Format: Article
Language:English
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Summary:Reclaimed Asphalt Pavement (RAP) is often used with Warm Mix Asphalt (WMA) additive to reduce the production temperature and limit emission at the asphalt plant and worksite. Despite sustainable utilization of RAP, the long-term performance of recycled mix is still quite concerning, and thus research focus on the risk of premature pavement distress. This study is a novel approach to examine the individual and the combined effect of hydrated lime and a warm mix additive (Sasobit) on the long-term performance of the recycled mix. The recycled mixture is comprised of 50% RAP in this study. The study simulated short-term ageing and long-term ageing as per the standard AASTHO R30 ageing protocols on the recycled mix. The properties of recycled mixtures were investigated by Marshall stability, indirect tensile strength, moisture susceptibility, rutting, ravelling resistance, stiffness modulus, and fatigue cracking test. Laboratory findings suggest that the recycled control mix is highly affected by the long-term ageing concerning higher moisture susceptibility, lower fatigue, and cracking resistance properties. However, the individual presence of the additive limits the extent of ageing, where hydrated lime acted as a multifunctional additive, and warm mix additive decreased the moisture and rutting resistance of the mixture in long-term ageing. But it is interesting to note that mix treated with both the additives produce considerable performance enhancement by lowering the ageing and simultaneously depicts higher fatigue and cracking resistance performance of the said mix. Such a result is attributed to the fact that hydrated lime and warm mix additive modify the oxidation kinetics of the mix positively and react with the oxidation products thereby rendering the mix free from deleterious effects.
ISSN:1996-6814
1997-1400
DOI:10.1007/s42947-022-00173-y