| Drainage asphalt pavement is a multi-void open grade asphalt pavement,which has the advantages of anti-sliding,noise reduction and improved driving comfort.It has attracted widespread attention of road workers in recent years;especially the combination of drainage asphalt mixture and high-viscosity asphalt.Use,to solve the problem of insufficient durability of the drainage road surface in the past.With the development of various high-viscosity modifiers,the research on the modification effect of different high-viscosity modifiers on asphalt has become a hot topic in the research of modified asphalt.In addition,with the use of drainage pavement more and more Research on the drainage performance of the drainage pavement and the performance study of the various structural layers of the drainage pavement are also more meaningful.Firstly,two high-viscosity modifiers A and B were selected to analyze the modification effects of these two high-viscosity modifiers on matrix asphalt and SBS modified asphalt from the three major indexes of asphalt,dynamic viscosity and storage stability.It is found that the modification effect of two high viscosity modifiers on SBS modified asphalt is better than that of matrix asphalt.The modification effect of B high viscosity modifier on the same asphalt is better than that of A high viscosity modifier;The best modification effect when the dosage is 9%.The softening point difference method was used to analyze the storage stability of high-viscosity asphalt.It was found that the storage time of high-viscosity asphalt should not exceed 72 h.3# and 4# high-viscosity asphalt were selected as binders,and the mix ratio of PAC-13 drainage asphalt mixture was designed.The best oil-stone ratio of the mixture was determined to be 4.7% by using the scattering experiment and the leak test.The road performance test of the mixture found that the road performance of the two mixtures meets the road performance requirements of the drainage asphalt mixture,and the road performance of the A mixture is better than that of the B mixture,and the anti-slip property is much better than the dense Asphalt mixture.Secondly,four kinds of PAC-13 mixtures with different porosities were selected,and AC-13 and SMA-13 were selected for comparison.The porosity,effective porosity and water permeability coefficient of the six kinds of mixtures were determined by laboratory test.PAC-was found.13 Porosity between 18% and 25%,the effective porosity is between 14% and 20%,the water permeability coefficient is between 1200ml/min and 2500ml/min,and the porosity and water permeability of AC-13 and SMA-13.The coefficients are very small,not one order of magnitude with PAC-13,and the commonly used 20% porosity PAC-13 mixture has a water permeability coefficient of 1800 ml/min.Finally,using bisar software to calculate the deflection and interlaminar bending stress of the drainage pavement with different combinations of three different drainage layer thicknesses under different upper porosity,it is found that the drainage pavement with the same structural combination uses different pores.When the upper layer of the rate is obtained,the road surface deflection and the maximum layer bottom tensile stress increase with the increase of the upper layer porosity;when the three structures use the upper layer of the same gap,the road surface deflection of the structural combination 1 And the maximum layer bottom tensile stress is less than the structural combination 2 is smaller than the structural combination 3,the structural combination 1 is used with the given weight in the traffic and medium traffic conditions,the combination 2 is only suitable for medium traffic,and the combination 3 is not applicable to the two traffic levels.,that is,the performance of the combination 1 is better than the combination 2 is better than the combination 3?... |
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