Research On Variability Of Quality Of Asphalt Airport Pavement Material

Asphalt pavement in airport as the platform of arriving and departing flights, ensure the quality of it building has important significance to the platform of airport safe operation. Due to the process of construction quality of asphalt pavement is a dynamic, so a higher research on the variability of construction required, and also grasping quality change mechanism, which providing theoretical basis for site construction and quality control. After the analysis of domestic airport asphalt pavement construction data, a large number of indoor and outdoor tests were done in the research, including the variability of the quality of modified asphalt and asphalt cement, the variability of the mineral aggregate gradation and segregation of asphalt mixture, and the variability of the quality of the adhesive layer.The thesis through the data summary on domestic airport asphalt pavement construction,found in the construction of modified asphalt performance, aggregate size, packing and uniformity of asphalt pavement layer and binder etc is existence biggish variability; The type of SBS has influence on the performance of modified asphalt. Star and linear SBS modified asphalt have their advantage each other; The perfomance of factory modified asphalt not better always than field modified asphalt, so the modified mothed should be choosen according to the demond, modified condition and field condition; According to the disadvantage of tube test, new device for storage stability of SBS modified asphalt is developed. it is found that its distinguish ability is better than tube test, and the deviation of soften point is less than that of tube test. Then it is suggeted that the time for storage is 24h, and the evaluation index is deviation of soften point between uper and lower; Asphalt cement is apparently showing non-newton fluid characteristics in viscosity trials, and the test of viscosity is reduce with shearing rate.In the test, lime is the most sensitive according to the shearing rate,then is cement and powder is the worst, and asphalt cement viscosity is increased sensitivity with the increase percentage of filler and asphalt; Because of different equipment quality, operators and experience level of equipment maintenance, the influence of factors such as the white tower of the mixture of different control precision obviously different gradation; Gradation have significant influence on mixture dynamic stability, and the quality control requirements within the scope of the mixture dynamic stability may also appear nearly doubled, the change of correlation analysis proves whatever gradation parameters or volume index can not efficiently estimate mixture dynamic stability; The correlation of remnants stability and freeze-thaw splitting strength is not good, the freeze-thaw splitting strength is better distinguish different mixtures compared with remnants stability, and porosity of asphalt mixture is the main factors influencing the water stability; Through the research of shear upper plate about asphalt mixture composite, the study found in composite material composition of interlayer shear properties has an important influence, so the study on bonding degree between layers and field application should use the same way. According to the test of variable amount of shear strength under composite, and then recommend the reference optimum mix amount dose with different material of adhesion.