Abstract:
In order to analyze the influence of foaming effect of zeolite powder and residues on the performance of asphalt and mixture from construction to service, and to study the influence of zeolite powder on the performance of asphalt and warm mix asphalt tamar hoof fat lithotripsy(SMA) mixture, zeolite powder based on foaming viscosity reduction mechanism is used as warm mixing additive.According to the different stages of zeolite powder participating in SMA mixture mixing, comparative asphalt mortar viscosity test, thermogravimetric analysis, compaction characteristics of mixture and conventional road performance test are designed to analyze the effects of zeolite powder and its residues on asphalt properties. The results show that the foaming effect of zeolite powder can reduce the high temperature viscosity of asphalt in the initial stage of mixing, and the residue will slightly increase the viscosity of asphalt after the foaming effect. The influence of the residue of zeolite powder on asphalt is similar to that of the same amount of mineral powder, and has little effect on penetration, softening point, ductility and other conventional road properties. Through Marshall, flying, leakage, rutting, bending and TSR tests of warm mix and hot mix SMA mixture, the influence of zeolite powder residue and residual effect on the performance of the mixture are analyzed. When the zeolite powder dosage is 0. 3% of SMA mixture, the mechanical properties, particle adhesion, high temperature stability, low temperature crack resistance, water stability and other road properties of warm mix SMA mixture are slightly decreased compared with hot mix SMA mixture, which has no obvious influence on engineering application. The results show that zeolite powder can improve the performance of asphalt and warm SMA mixture. When the mixing and forming temperature is reduced by 20 ℃, the mechanical properties, flight resistance, high temperature stability and low temperature crack resistance of SMA mixture are slightly decreased, but the amplitude is small and has no significant influence on the road service.