Assessing the effect of short and long-term aging on moisture damage of hot mix asphalt using two different methods

Arabani, Mahyar; Rahimabadi, Maryam Majd

doi:10.1080/10298436.2023.2168661

Cited by 7 publications

(4 citation statements)

References 24 publications

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“…Nevertheless, with the use of Wetfix and NHL, the decline in the adhesion strength of bitumen and aggregates decreased. This was confirmed in a research by Arabani et al [32].…”

Section: Pull-off Test Resultssupporting

confidence: 77%

“…Limestone aggregate is more resistant than granite aggregate because of the hydrophobic property of limestone aggregate. A similar result was indicated for wetfix additives in previous research by Arabani and Rahimabadi [6]. However, for the PG58-22 bitumen, the addition of Wetfix raised the modulus of elasticity in limestone aggregates by 30% in the dry state and 40% in the wet state; in granite aggregates, this value was raised by 40% in the dry state and 54% in the wet state.…”

Section: Pots ¼supporting

confidence: 88%

“…Following this, they were left at 25°C for an hour before being prepared for the tensile modulus test [28]. ITSM and MSR were determined based on Equations ( 5) and (6), respectively [29]. Finally, the MSR parameter (the ratio of wet samples' Mr to dry samples' Mr) was calculated.…”

Section: Aging Test Of Bitumen and Asphaltmentioning

confidence: 99%

“…Moisture damage and bitumen aging in the first stage separate the bitumen coating from the aggregate surface. Antistripping additives, e.g., liquid antistripping additives and various nanolimes, are usually incorporated to overcome this phenomenon [6].…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Wetfix and Nanohydrated Lime Additives on Bitumen Aging and the Cohesion and Adhesion Failure Mechanisms of Hot Asphalt Mixtures

Arabani

Abadi

Hamedi

2023

Advances in Civil Engineering

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Aging due to sunlight and the passage of time is an effective element in the occurrence of moisture damage in hot asphalt mixtures. Still, the effects of this parameter are scarcely considered in the experiments examining the moisture damage potential. Accordingly, this study investigated the effect of aging on the performance of hot asphalt mixtures and examined the improvement of moisture damage performance by using antistripping additives via mechanism and functional tests. Two types of aggregates (limestone and granite) with different degrees of moisture sensitivity, two types of bitumen (PG64-16 and PG58-22) with different performances, and two additives (Wetfix liquid additive and nanohydrated lime) as bitumen modifiers were used. Bitumen samples and asphalt mixtures were subjected to short- and long-term aging. The pull-off test was performed to explore the aging effect on different failure mechanisms (cohesion and adhesion), and the indirect tensile stiffness modulus (ITSM) test was conducted to study the asphalt mixture’s performance against moisture damage. The results specify that aging, in terms of hot asphalt mixture hardening in dry and wet conditions, decreased the MSR (resilient modulus wet to resilient modulus dry ratio), and this decline was greater in long-term aging. The pull-off test results exhibited that aging, especially in the long term, decreased the asphalt mixture’s adhesive strength in dry and wet conditions; this decline in adhesion was greater in the wet than in the dry state, and this difference decreased the wet-to-dry adhesion strength ratio (the pull-off ratio). The additives relatively improved the yield modulus of the asphalt mixture, but their effect was greater in the wet state. A comparison of the pull-off test results in cohesion and adhesion failure demonstrated that Wetfix was more effective in improving bitumen–aggregate adhesion, whereas nanohydrated lime was more effective in enhancing bitumen adhesion. The resilient modulus (Mr) ratio in wet-to-dry conditions indicated that nanohydrated lime had better effects on the overall performance of the aged asphalt mixture against moisture damage. To investigate the effect of additives on the performance of asphalt mixtures, a t-test was performed in all modes of control, short-term aging, and long-term aging. The findings showed the effect of Wetfix and nanohydrated lime on increasing the modulus of elasticity of the samples.

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“…Nevertheless, with the use of Wetfix and NHL, the decline in the adhesion strength of bitumen and aggregates decreased. This was confirmed in a research by Arabani et al [32].…”

Section: Pull-off Test Resultssupporting

confidence: 77%

Section: Pots ¼supporting

confidence: 88%