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Visco-elastic characterisation of zeolite modified asphalt binder considering phase transformation and air void interaction
A recent warm mix asphalt technology uses zeolite powders as an additive to reduce production temperature and improve workability. With an increase in temperature, water is released from the zeolite crystalline structure and vaporised into bubbles within the binder, and thus gas, fluid, and solid phases simultaneously exist in the modified binders. The effective complex modulus of the modified binders is measured by dynamic shear rheometer tests at different temperatures and frequencies. A micromechanics-based visco-elastic model is developed to interpret the test results and reproduce the master curves of modified binders with different proportions of zeolite based on the master curve of the pure binder. The self-consistent method adopted considers the effect of zeolite powders. At higher temperatures, the distribution of vapour voids is approximated as a hexagonal distribution. The interaction between neighbouring spherical voids is considered and the effective visco-elastic properties are predicted. The predictions of the model agree well with the experiments. The closed-form formulation developed can be used to make the specifications of warm mix asphalt pavement production and construction. This modelling approach can further be extended to polymer modified asphalt, asphalt emulsions, and other foaming processed materials.
Visco-elastic characterisation of zeolite modified asphalt binder considering phase transformation and air void interaction
A recent warm mix asphalt technology uses zeolite powders as an additive to reduce production temperature and improve workability. With an increase in temperature, water is released from the zeolite crystalline structure and vaporised into bubbles within the binder, and thus gas, fluid, and solid phases simultaneously exist in the modified binders. The effective complex modulus of the modified binders is measured by dynamic shear rheometer tests at different temperatures and frequencies. A micromechanics-based visco-elastic model is developed to interpret the test results and reproduce the master curves of modified binders with different proportions of zeolite based on the master curve of the pure binder. The self-consistent method adopted considers the effect of zeolite powders. At higher temperatures, the distribution of vapour voids is approximated as a hexagonal distribution. The interaction between neighbouring spherical voids is considered and the effective visco-elastic properties are predicted. The predictions of the model agree well with the experiments. The closed-form formulation developed can be used to make the specifications of warm mix asphalt pavement production and construction. This modelling approach can further be extended to polymer modified asphalt, asphalt emulsions, and other foaming processed materials.
Visco-elastic characterisation of zeolite modified asphalt binder considering phase transformation and air void interaction
Yin, H. M. (author) / Lai, B. (author)
Road Materials and Pavement Design ; 13 ; 279-299
2012-06-01
21 pages
Article (Journal)
Electronic Resource
English
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