Effect of Layered Double Hydroxides(LDHs)on Anti-aging Properties of SBS Modified Asphalt
In order to enhance the anti-aging performance of styrene-butadiene-styrene(SBS)modified bitumen(SMB),SMB was modified by the special structure of layered double hydroxides(LDHs)in this study.The effect of LDHs on the physical properties,high or low temperature rheological properties and chemical structure of SMB was studied.The result showes that the addition of LDHs can improve the elastic properties of SMB and enhance its high-temperature stability;After aging,oxidation reactions of bitumen molecules caused the increase of oxygen-containing functional groups(S=O and C=O)content in SMB.At the same time,the SBS molecular chains broke down,which resulted in the decrease of carbon-carbon double bonds(C=C)content in SMB.All the changes made the physical properties,high-temperature rutting resistance,and low-temperature fatigue cracking resistance of SMB deteriorated.And SMB became hard and brittle;The addition of LDHs can prevent the oxidation reaction of bitumen molecules and the breaking of SBS molecular chains to retard the aging of bitumen molecules and SBS degradation,mitigate the damage to the physical properties and high or low temperature rheological properties of SMB,and enhance the anti-aging capacity of SMB,which provide technical support for the long-life SMB pavement.
SBS modified bitumen(SMB)layered double hydroxides(LDHs)physical propertiesrheological propertieschemical structureanti-aging capacity
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