| (1)Cement,ground granulated blast furnace slag(GGBS)and fly ash are regarded as a set of mix,fine aggregate and coarse aggregate are regarded as another set of mix.The effect of GGBS,cement and sand ratio on the workability and compressive strength of high performance concrete is analyzed with the combined mix design theory,which can achieve the optimization of mix.(2)the different amount of polypropylene fiber was added to the high performance concrete with fly ash and GGBS.The effect of polypropylene fiber on the mechanical strength and durability of high performance concrete is obtained through laboratory tests.The experimental results show that polypropylene fiber can improve the impact resistance,flexural strength,flexural toughness,frost resistance and impermeability of high performance concrete,reduce shrinkage rate,but it has no effect on compressive strength..(3)By establishing the finite element model of pavement structure,the mechanical response of asphalt pavement paved concrete pavement under vehicle temperature load and dynamic load is studied.The results show that the coupling stress of the overlay is the smallest under interlayer continuous state.Increasing the thickness of the overlay and the old asphalt layer and ensuring the better bearing capacity of the old road can reduce the tensile stress of the concrete overlay.(4)Considering the concrete paving design parameters uncertainty and variability,The Monte Carlo algorithm for the reliability of the cement concrete overlay is realized by MATLAB programming,and the reliability function with the target of reliability is obtained.The results show that there is a positive correlation between the thickness of the overlay,the bending strength of the design,the equivalent resilience modulus of the old road surface and the output variables,and there is a negative correlation between the cumulative equivalent axis and the elastic modulus of concrete and the output variables. |
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