Evaluation of fracture resistance of asphalt mixes involving steel slag and RAP: Susceptibility to aging level and freeze and thaw cycles

Fakhri, Mansour; Ahmadi, Amin

doi:10.1016/j.conbuildmat.2017.09.116

Cited by 82 publications

(16 citation statements)

References 50 publications

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“…Due to the instability and uncleanness of steel slag fine aggregate, it would weaken the pavement performance of asphalt mixture [26,27]. In addition, the lager specific surface area of steel slag fine aggregate would cause more volume expansion and additional bitumen consumption in comparison with SSCA [28,29]. Considering engineering performance and economy, basalt fine aggregate was used as fine aggregate in this study, and steel slag fine aggregate was not adopted.…”

Section: Properties Test Values Specificationmentioning

confidence: 99%

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

et al. 2019

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Porous asphalt mixtures with steel slag (PAM-SS), as an eco-friendly and low-cost pavement material, are conducive to addressing the issue of urban floods and natural resource shortages. The primary objective of this paper was to explore the feasibility of the application of PAM-SS for seasonal frozen regions, and ascertain the optimal replacement percentage of natural aggregate. Steel slag coarse aggregate (SSCA) was used to replace basalt coarse aggregate (BCA) at four levels (25%, 50%, 75%, 100%) by equal volume. The volume characteristics, mechanical properties, low-temperature cracking resistance, water stability, and freeze-thaw (F-T) durability of the mixture were assessed. The results indicated that the low-temperature cracking resistance of the mixture was significantly enhanced and acoustic emission (AE) energy was uniformly released by the incorporation of steel slag. Furthermore, the porosity, permeability, Marshall stability (MS), and the resistance against water damage and F-T cycles were also significantly improved. Based on the experimental results, the complete replacement of natural aggregate is advisable to obtain an optimal overall performance.

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Section: Properties Test Values Specificationmentioning

confidence: 99%

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

et al. 2019

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“…The research results showed that gradation had a significant effect on the mechanical strength and road performance of asphalt mixtures [ 21 , 22 ]. Based on engineering experience, four gradations were selected, as shown in Table 4 .…”

Section: Resultsmentioning

confidence: 99%

“…This spatial three-dimensional network structure not only ensured that the mixture had a certain strength, but also prevented excessive deformation of the mixture when the asphalt was softened under high temperature conditions. Therefore, in actual engineering applications, a small content of cement was generally added to improve the water stability, early strength and rutting resistance of CRME [ 21 , 23 , 24 ].…”

Section: Resultsmentioning

confidence: 99%

Research on Low Temperature Performance of Emulsified Asphalt Cold Recycled Mixture and Improvement Measures Based on Fracture Energy

et al. 2020

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At present, there are no specific indicators and requirements for the low-temperature crack resistance of emulsified asphalt cold recycled mixture (CRME) in the Chinese road mixture specifications. In order to expand the application of this technology in the asphalt surface layer in cold areas, this paper studied the influence of 10 influencing factors on the low-temperature anti-cracking performance of CRME through the semicircular bending test (SCB) with fracture energy as the evaluation index. The research results show that the fracture energy index of the SCB test can be used to evaluate the low temperature crack resistance of CRME. After 10 kinds of influencing factors were analyzed, it was found that the biggest factor affecting the low-temperature cracking resistance of the mixture was the recycling agent, which had an effect on the fracture energy index of over 60%. Followed by cement, fiber and compaction work, the degree of influence exceeded 30%. Finally, combined with engineering application experience, some specific measures to improve the low-temperature anti-cracking performance of CRME were proposed.

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“…Omranian et al (2018) [8] found that the stiffening of an asphalt mixture by aging increment is beneficial until a certain level based on the higher energy requirement necessary to reach failure, while the detrimental effects of aging are observed once the aging conditioning crosses the fracture resistance level given for an optimal mix. Fakhri et al (2017) [31] found that laboratory simulation of aging reduces the fracture resistance of asphalt mixes in terms of both critical strain energy release rate (Jc) and flexibility index (FI), however, the statistical comparison shows that the reduction is only significant in case of flexibility index. The results also depend on reclaimed asphalt (RA) content.…”

Section: Introductionmentioning

confidence: 99%

Influence of Laboratory Long-Term Aging on Selected Fracture Parameters of Asphalt Mixtures

2021

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The paper presents the influence of laboratory aging simulation on fracture properties determined on 150 variants of asphalt mixtures. The fracture properties were determined by two different test approaches—semi-circular bending test (SCB test) and three-point bending test on beam specimens (3-PB test). The aging was simulated according to one of the methods defined in EN 12697-52 (storage of test specimens in chamber at temperature of 85 °C for 5 days). The evaluated group of variants covered asphalt mixtures for all road layers. The group was further divided according to used bituminous binder (unmodified vs. modified) and reclaimed asphalt content. The results showed that strength parameters (flexural strength and fracture toughness) increase with aging. It further shows that fracture work provides more complex information about the cracking behavior. For the aging indexes, it was found that for mixtures with modified binders and mixtures which did not contain reclaimed asphalt (RA), the values were higher. The aging indexes for fracture work showed different results for both performed tests.

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Evaluation of fracture resistance of asphalt mixes involving steel slag and RAP: Susceptibility to aging level and freeze and thaw cycles

Cited by 82 publications

References 50 publications

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

Laboratory Evaluation on the Performance of Porous Asphalt Mixture with Steel Slag for Seasonal Frozen Regions

Research on Low Temperature Performance of Emulsified Asphalt Cold Recycled Mixture and Improvement Measures Based on Fracture Energy

Influence of Laboratory Long-Term Aging on Selected Fracture Parameters of Asphalt Mixtures

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