Multiscale Study on Low Temperature Crack Resistance Mechanism of Steel Slag Asphalt Mixture

The objective of this paper was to study low temperature crack resistance mechanism of steel slag asphalt mixture(SAM). Thermal stress restrained specimen test (TSRST) and three-point bending test were carried out to evaluate the low-temperature crack resistance of SAM and basalt asphalt mixture (BA...

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Bibliographic Details
Published in:Journal of Wuhan University of Technology. Materials science edition 2024, Vol.39 (3), p.705-715
Main Authors: Bai, Xuefeng, Wang, Lan, Chen, Xiunan
Format: Article
Language:English
Subjects:
Asphalt
Asphalt mixes
Basalt
Calcite
Calcium carbonate
Cementitious Materials
Chemistry and Materials Science
Crack propagation
Digital imaging
Elastic deformation
Failure modes
Low temperature
Low temperature resistance
Materials Science
Phase composition
Slag
Steel
Surface roughness
Thermal stress
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Summary:The objective of this paper was to study low temperature crack resistance mechanism of steel slag asphalt mixture(SAM). Thermal stress restrained specimen test (TSRST) and three-point bending test were carried out to evaluate the low-temperature crack resistance of SAM and basalt asphalt mixture (BAM). Based on the digital image correlation technique (DIC), the strain field distribution and crack propagation of SAM were analyzed from the microscopic point of view, and a new index, crack length factor ( C ), was proposed to evaluate the crack resistance of the asphalt mixture. The crystal phase composition and microstructure of steel slag aggregate (SA) and basalt aggregate (BA) were studied by X-ray diffraction (XRD) and scanning electron microscopy (SEM) to explore the low-temperature crack resistance mechanism of SAM. Results show that the low-temperature crack resistance of SAM is better than that of BAM; SAM has good integrity and persistent elastic deformation, and its bending failure mode is a hysteretic quasi-brittle failure; The SA surface is evenly distributed with pores and has surface roughness. SA has the composition phase of alkaline aggregate-calcite (CaCO 3 ), so it has good adhesion to asphalt, which reveals the mechanism of excellent low-temperature crack resistance of SAM.
ISSN:1000-2413
1993-0437
DOI:10.1007/s11595-024-2929-z