Abstract
Natural zeolite (NZ), synthetic zeolite (SZ) and sasobit (S) additives have been utilized by many for warm-mix asphalt (WMA) mixtures production. However, the engineering properties of WMA mixtures under long-term aging (LTA) process still need to be determined. This paper examines the effect of laboratory aging process in accordance to AASHTO R30 on WMA (NZ, SZ, and S) mixtures by characterizing Marshall stability, Marshall quotient, indirect tensile strength, tensile strength ratio, flexural strength, and creep compliance. The results from this study indicated that at the α = 0.05 level: (1) the difference in the Marshall stability, unconditioned tensile strength, conditioned tensile strength, flexural modulus, and stiffness modulus as a function of the LTA effects between NZWMA and SZWMA mixtures was found to be statistically insignificant, whilst, the difference in the creep compliance was found statistically significant; (2) the difference in the Marshall stability, unconditioned tensile strength, conditioned tensile strength, and creep compliance as a function of the LTA effects between SZWMA and SWMA mixtures was found to be statistically significant, whilst, the difference in the flexural and stiffness modulus was found statistically insignificant; (3) the performance of WMA mixtures after LTA ranked in an increased order as follows: NZWMA ˃SZWMA˃SWMA; and (4) all mixtures (i.e., NZWMA, SZWMA, and SWMA) satisfy the minimum requirements of 8kN stability, 2–4 mm flow, and 14% voids in mineral aggregate, except for SWMA mixture which not satisfies voids in mineral aggregate requirements after LTA.
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Acknowledgements
The writer wishes to extend his appreciation to the Materials Laboratory, Mosul university, R.P. Iraq for technical assistance, as well as to Dora refinery, and Areej Al-Furat company that provided the materials used in this study.
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Al-Hadidy, A.I., Khalid, S.A. Effect of Long-Term Aging on the Tensile Strength, Flexural Strength and Creep Behaviour of Asphalt Mixtures Containing Different WMA Additives. Int. J. Pavement Res. Technol. 17, 435–445 (2024). https://doi.org/10.1007/s42947-022-00246-y
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DOI: https://doi.org/10.1007/s42947-022-00246-y