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Adhesion Properties Between Rubber Asphalt Mastic and Aggregate: Verification from Surface Free Energy Theory and
Huajia Yin1, Shenyang Cao2,3, Fucheng Guo4
1Gansu Jiayuguan Highway Development Center, Jiayuguan 735100, China.
None:
The adhesive properties between rubber asphalt mastic and aggregate are crucial to rubber asphalt mixtures' stability and moisture resistance. This paper employs surface free energy (SFE) theory and molecular dynamics (MD) to examine the bond strength and debonding behavior at the rubber asphalt mastic-aggregate interface. The results showed that the dispersion fraction of RC1.0 was 7.12 mJ/m2 higher than that of RA, and the limestone mineral powder improved the adhesion properties of rubberized asphalt to aggregate and the anti-stripping properties. SiO2 and CaCO3 are contributors to the van der Waals and electrostatic forces between rubber asphalt-aggregate, respectively. The high concentration of mineral powder has a bridging effect in rubber asphalt mastic-aggregate. CaCO3 filler is more pronounced in enhancing the adhesion properties of rubber asphalt-aggregate. CaCO3 mineral powder mainly improves the anti-debonding ability of rubber asphalt-aggregate by reducing the thickness of water film between rubber asphalt-aggregate.
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