Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete
1
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China
2
Research Institute of Highway of Ministry of Transport, Beijing 100088, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(5), 741; https://doi.org/10.3390/ma12050741
Received: 31 January 2019
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Revised: 23 February 2019
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Accepted: 27 February 2019
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Published: 4 March 2019
(This article belongs to the Special Issue Sustainable Designed Pavement Materials)
In order to examine the geometric characteristics of BOF (blast oxygen furnace) slag coarse aggregate, the aggregate image measurement system (AIMS) was used to analyze the sphericity, gradient angularity and micro texture. Both volumetric and mechanical properties were studied to evaluate the influence of geometric characteristics of BOF slag coarse aggregate on asphalt concrete. The experimental results show that the BOF slag coarse aggregate has the characteristics of high sphericity, good angular performance and rough surface texture. The geometric characteristics of BOF slag has obvious influence on the volume performance of asphalt concrete. the higher sphericity of BOF slag causes an increase of the air voids of asphalt mixture. BOF slag coarse aggregate can effectively improve the road performances of asphalt concrete. BOF slag’s higher sphericity and angularity improve the moisture damage resistance and rutting resistance of asphalt concrete. Results indicate that better angularity can slightly enhance the moisture resistance property of asphalt concrete, but excessively high angularity of BOF slag coarse aggregates reduces the anti-rutting properties of asphalt mixture.
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MDPI and ACS Style
Kong, D.; Chen, M.; Xie, J.; Zhao, M.; Yang, C. Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete. Materials 2019, 12, 741. https://doi.org/10.3390/ma12050741
AMA Style
Kong D, Chen M, Xie J, Zhao M, Yang C. Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete. Materials. 2019; 12(5):741. https://doi.org/10.3390/ma12050741
Chicago/Turabian StyleKong, Dezhi, Meizhu Chen, Jun Xie, Meiling Zhao, and Chao Yang. 2019. "Geometric Characteristics of BOF Slag Coarse Aggregate and its Influence on Asphalt Concrete" Materials 12, no. 5: 741. https://doi.org/10.3390/ma12050741
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