Performance evaluation on nano ZnO/SBR composite modified emulsified asphalt and micro-surfacing mixture
In order to study the composite modification effect and road performance of nano-ZnO and SBR on emulsified as-phalt,the paper carried out the performance characterization and evaluation of nano-ZnO/SBR composite modified emulsified as-phalt,and studied the effect of nano-ZnO particles on the road performance of emulsified asphalt and micro-surfacing mixture.The research shows that nano-ZnO has a significant impact on the fluid characteristics(particle size,modulus,etc.)of emulsified asphalt.When the nano-ZnO content is 2％and 3％,it improves the high-temperature performance indicators such as softening point,non-recoverable flexibility and SPG grade of residue.Within the range of 0～3％content,the high temperature grade of emulsified as-phalt can reach SPG70.When the nano-modified emulsified asphalt is applied to micro-surfacing mixture,it shows fast demulsifi-cation speed and high early strength of mixture.When the nano-ZnO content is more than 2％,the workability of emulsified as-phalt slurry decreases and demulsification cannot be controlled.
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