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Thermal properties of hydrated lime-modified asphalt concrete and modelling evaluation for their effect on the constructed pavements in service

Al Ashaibi, AAIH; Wang, Y; Albayati, A; Byzyka, J; Scholz, M; Weekes, L

Thermal properties of hydrated lime-modified asphalt concrete and modelling evaluation for their effect on the constructed pavements in service Thumbnail


Authors

AAIH Al Ashaibi

A Albayati

J Byzyka

M Scholz

L Weekes



Abstract

Flexible pavements are subjected to three main distress types: fatigue crack, thermal crack, and permanent deformation. Under severe climate conditions, thermal cracking particularly contributes
largely to a considerable scale of premature deterioration of pavement infrastructure worldwide. This challenge is especially relevant for Europe, as weather conditions vary significantly
throughout the year. Hydrated lime (HL) has been recognized as an effective additive to improve the mechanical properties of asphalt concrete for pavement applications. Previous research has
found that a replacement of conventional limestone dust filler using hydrated lime at 2.5% of the total weight of aggregates generated an optimum improvement in the mechanical properties of the asphalt concrete mixes used for all three purposed layers (i.e., wearing, levelling, and base) at atmospheric temperatures from mild to relatively high. This paper reports on a continuous experimental test for the thermal properties of the optimized hydrated lime-modified mixes. The experiment
together with that conducted before provides the required data to characterize the thermomechanical constitutive relations of the optimized hydrated lime-modified mixes. The obtained thermal
and mechanical properties thereafter were implemented in a numerical modelling study for a scenario involving pavement exposed to coupled thermal and traffic service conditions. The study has demonstrated that using HL in mineral filler enhances the thermal properties of asphalt concrete, which, however, showed little influence on the local temperature profiles within the pavement structure. The thermal effect is pronounced under the coupled thermomechanical conditions for a pavement exposed to both traffic and climatic impacts. The HL pavement has about 1.5% less deformation, and 39% less stress level under traffic loading only, but the thermal effect increases the maximum total internal tensile stress level by 26% in the HL pavement in winter season. The modelling analysis has shown that the local maximum tensile stress dominates in the surface region of the HL pavement. It will help to reduce the workload of crack repairing and in long term help on saving costs and efforts of maintenance.

Citation

Al Ashaibi, A., Wang, Y., Albayati, A., Byzyka, J., Scholz, M., & Weekes, L. (2022). Thermal properties of hydrated lime-modified asphalt concrete and modelling evaluation for their effect on the constructed pavements in service. Sustainability, 14(13),

Journal Article Type Article
Acceptance Date Jun 23, 2022
Publication Date Jun 27, 2022
Deposit Date Aug 1, 2022
Publicly Available Date Aug 1, 2022
Journal Sustainability
Publisher MDPI
Volume 14
Issue 13
Publisher URL https://doi.org/10.3390/su14137827
Additional Information Funders : Ph.D. studentship sponsored by the government of Libya.

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