Utilization of steel slags to produce thermal conductive asphalt concretes for snow melting pavements

Jiao, Wenxiu; Sha, Aimin; Liu, Zhuangzhuang; Jian, Wei; Hu, Liqun; Li, Xinzhou

doi:10.1016/j.jclepro.2020.121197

Cited by 74 publications

(14 citation statements)

References 33 publications

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“…Additionally, as the steel slag content in asphalt mixtures increases, the thermal conductivity of the asphalt mixture first increases and then decreases (Barišić et al, 2017). Alkaline substances in steel slag can increase the concentration of asphalt components on the aggregate surface and enhance the adhesion between asphalt and steel slag (Jiao et al, 2020). Some heavy metals may also exist in steel slag.…”

Section: Introductionmentioning

confidence: 99%

Deformation of Steel Slag Asphalt Mixtures Under Normal Temperature Water Immersion

Wang

Zhang

2021

Front. Mater.

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To study the deformation resistance of steel slag asphalt mixtures (SSAMs) under rainy conditions, limestone–asphalt mixtures (LAMs) and SSAM were soaked in water at room temperature for 120 days and rutting tests and triaxial compression tests were carried out. The results show that the deformation resistance of SSAM was improved after 120 days of immersion, the cohesion did not decrease significantly, and the internal friction angle increased by 25.1%; the deformation resistance of LAM decreased significantly, the cohesion decreased by 27.1%, and the internal friction angle decreased by 21.1%. To better understand the reason for the increased anti-deformation ability, adhesion tests of asphalt and microscopic studies of the steel slag surface were performed. The experimental results showed that the cohesion of steel slag did not decrease significantly after immersion because of the excellent adhesion between steel slag and asphalt. The increased internal friction angle was caused by calcium hydroxide and other crystals formed on the surface of the steel slag mixture after immersion, which increased the surface roughness of the steel slag aggregates and the internal friction angle of the SSAM. The mechanical properties of semirigid asphalt pavement were analyzed by ANSYS. It was determined that the shear stress of this type of pavement is large, and it can easily produce permanent deformations. Under the influence of moisture, the anti-deformation ability of SSAMs can grow, which promotes the high-temperature deformation resistance of asphalt pavement. Based on a test road used for 2 years, the SSAM pavement exhibited no pavement problems, such as cracking, loosening, or rutting, which indicates good practical road performance.

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Section: Introductionmentioning

confidence: 99%

Deformation of Steel Slag Asphalt Mixtures Under Normal Temperature Water Immersion

Wang

Zhang

2021

Front. Mater.

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“…Research results verified that the mechanical performance of steel slags asphalt mixtures displayed better workability, stiffness, and resistance to moisture damage, fatigue cracking, and permanent deformation [24,25]. en, compared with traditional asphalt mixture, asphalt mixture incorporating steel slag owned better pavement performance besides environmental friendliness [26][27][28]. One concern was considered; the volume stability of steel slag would weaken its performance, while previous studies had concluded that steel slag exhibited fine volume stability due to its lower expansion rate meeting the specification requirements [29][30][31].…”

Section: Introductionmentioning

confidence: 60%

Investigation of Permanent Deformation Behavior of Steel Slag Asphalt Mixture under Indoor Simulation

Wei

Yang

Xie

et al. 2021

Advances in Civil Engineering

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Previous studies have indicated that steel slag can be used as a substitute for natural aggregates in asphalt mixture, while little attention has been paid to systematic investigation of the influences of various external environmental factors on deformation resistance of steel slag asphalt mixture. In order to understand the service behavior of steel slag asphalt mixture, its permanent deformation under different condition was investigated based on an indoor simulation test. The chemical composition, microscopic structure, surface texture, and volume stability of steel slag were firstly characterized. The uniaxial repeated loading test and standard wheel-tracking test were applied to evaluate the effect of temperature, stress levels, and water damage on the permanent deformation of AC-16 and AC-20 steel slag asphalt mixtures. The results indicate that a higher content of alkaline oxide and high-grade texture index existing in steel slag contribute to its strong absorptivity and adhesion of asphalt. The steel slag demonstrates fine volume stability due to its lower free-CaO (f-CaO) content, autoclave chalked ratio, and immersion expansion ratio. The permanent deformation of steel slag asphalt mixtures increases rapidly under higher stress and temperatures in contrast to lower increment at lower stress and temperatures. Asphalt mixtures at higher stress and higher temperatures and water condition exhibit larger rutting deformation and inferior rutting resistance. AC-16 steel slag asphalt mixture has superior resistance to permanent deformation than AC-20 asphalt mixture. Rutting factors show different degrees of impact in a decreasing order of temperature, water damage, and stress levels. The findings have significant implications for providing a theoretical basis for reusing steel slag in pavement construction and facilitating engineering application of steel slag asphalt mixture.

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“…The reasons lied in the strong adhesion between the steel slag aggregates and bitumen. The strong adhesion was associated with the peculiar porous characteristics, rough texture, and alkalinity of the steel slag [ 59 ]. Furthermore, it can be found that the middle- and high-energy events of the SS-100 were mainly centralized in the tensile mode, because the AE energy of tensile crack is substantially higher than that of shear crack [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

“…There were several reasons that accounted for it. On the one hand, the high strength and interlocking structure of the steel slag aggregates restrained the development of the macro-cracks in aggregates and binders, which weaken the phenomenon of brittle fracture of aggregates [ 59 ]. On the other hand, the rough and porous texture of the steel slag aggregates could absorb more structural bitumen [ 61 ].…”

Section: Resultsmentioning

confidence: 99%

Fracture Behavior of Permeable Asphalt Mixtures with Steel Slag under Low Temperature Based on Acoustic Emission Technique

Zhu

Liu

et al. 2020

Sensors

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Acoustic emission (AE), as a nondestructive testing (NDT) and real-time monitoring technique, could characterize the damage evolution and fracture behavior of materials. The primary objective of this paper was to investigate the improvement mechanism of steel slag on the low-temperature fracture behavior of permeable asphalt mixtures (PAM). Firstly, steel slag coarse aggregates were used to replace basalt coarse aggregates with equal volume at different levels (0%, 25%, 50%, 75%, and 100%). Then, the low-temperature splitting test with slow loading was used to obtain steady crack growth, and the crack initiation and propagation of specimens were monitored by AE technique in real time. From the low-temperature splitting test results, SS-100 (permeable asphalt mixtures with 100% steel slag) has the optimal low-temperature cracking resistance. Therefore, the difference of fracture behavior between the control group (permeable asphalt mixtures without steel slag) and SS-100 was mainly discussed. From the AE test results, a slight bottom-up trend of sentinel function was founded in the 0.6–0.9 displacement level for SS-100, which is different from the control group. Furthermore, the fracture stages of the control group and SS-100 could be divided based on cumulative RA and cumulative AF curves. The incorporation of 100% steel slag reduced the shear events and restrained the growth of shear cracking of the specimen in the macro-crack stage. Finally, the considerable drops of three kinds of b-values in the final phase were found in the control group, but significant repeated fluctuations in SS-100. In short, the fracture behavior of PAM under low temperature was significantly improved after adding 100% steel slag.

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Utilization of steel slags to produce thermal conductive asphalt concretes for snow melting pavements

Cited by 74 publications

References 33 publications

Deformation of Steel Slag Asphalt Mixtures Under Normal Temperature Water Immersion

Deformation of Steel Slag Asphalt Mixtures Under Normal Temperature Water Immersion

Investigation of Permanent Deformation Behavior of Steel Slag Asphalt Mixture under Indoor Simulation

Fracture Behavior of Permeable Asphalt Mixtures with Steel Slag under Low Temperature Based on Acoustic Emission Technique

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