Evaluation Research On Low Temperature Performance Of A Certain Rubber Asphalt Concrete

Along with the high-speed development of our national economy and comprehensive national strength growing increasingly, highway construction in the national infrastructure construction plays a more and more important role. And because the bituminous pavement has good overall performance, drive comfort is strong, quick construction quickly, repair maintenance is convenient wait for an advantage, in the highway construction in the proportion has increased year by year. However, due to traffic load has increased year by year, the dramatic changes in environmental factors, as well as non-standard construction operation and other reasons, asphalt pavement early damage is also plagued by various national highway builder. The method not only can improve the ability of resistance to various diseases of asphalt pavement, without too much investment, has become the hot issue concerned by all circles expert.Rubber asphalt is through the discarded automobile tires at room temperature under the conditions of the pulverization, formed certain fine rubber powder particles, then the rubber powder particles in high temperature conditions and matrix asphalt mix, and after full swelling reaction, and the formation of a new asphalt pavement cementing materials. Rubber asphalt in asphalt added with crumb rubber, improves the matrix asphalt low temperature crack resistance, high temperature stability and fatigue performance. At the same time, with the widespread adoption of SBS modified asphalt, asphalt rubber with low cost economic advantage. At present, recycling of solid waste is the state pay more attention to issues, rubber asphalt is widely used in some extent to solve a large number of scrap tire recycling problem, is gradually by the state and relevant departments in charge of construction 's favor.The rubber asphalt and 90 # asphalt penetration, ductility, softening point, elastic recovery and adhesion and the basic performance indicators of indoor experimental study. Aimed at the northeast of the seasonally frozen areas environmental characteristics, were low penetration, ductility at low temperature and low temperature elastic recovery test of asphalt rubber, the proportion of traffic 90 # asphalt has discretion warming needle penetration, low temperature ductility, low temperature elastic recovery capability. At the same time, more than 90 # rubber asphalt softening point of asphalt has bigger rise, high temperature stability is more prominent. Through the use of electromagnetic furnace, the adhesion of asphalt rubber and 90 # asphalt coarse aggregate for high power and long time boiling test, quantitative obtained remarkable advantages of asphalt rubber spalling resistance.The rubber asphalt and asphalt production 90 # asphalt concrete test piece, mainly pony Richelle specimen, rutting plate specimens as well as by rutting plate specimen is cut into small beam specimens, and the corresponding experimental research on road performance. The track plate specimens of 60 DEG C high temperature rutting test and 45 DEG C temperature rut test, the rubber asphalt in high temperature area or the low temperature region has good high temperature stability. The pony Richelle specimen by low temperature splitting test, the small beam specimen bend test at low temperature and low temperature impact toughness test, the rubber asphalt has better stability at low temperature. The pony Marshall test piece Marshall stability test, tensile test and freeze-thaw splitting test, the rubber asphalt has good water stability. The pony Richelle specimen by indirect tensile fatigue test, the rubber asphalt has good fatigue performance.This article through the dynamic compression test and indirect tensile stiffness ( dynamic ) modulus test, through comparing the corresponding kinetic parameters, the dynamic characteristics of rubber asphalt. Through the dynamic compression test, analyzed the rubber asphalt in different frequency load under dynamic compressive modulus and the lagging phase angle change rule. Through the analysis of the dynamic compressive modulus, the rubber asphalt concrete dynamic compressive modulus in the whole test frequency range were less than 90 # dynamic modulus of asphalt concrete, rubber powder obviously increases the flexibility of asphalt concrete, is beneficial to improve the rubber asphalt concrete at low temperature stability. The lagging phase angle analysis, the rubber asphalt concrete phase angle in the whole test frequency range change is not big, basically tends to be a straight, description of the loading frequency on rubber asphalt concrete the lagging phase angle by load frequency effect. By indirect tensile stiffness ( dynamic ) modulus test, analysis of different test temperature dynamic indirect tensile stiffness modulus variation, reached rubber asphalt concrete affected by temperature is small, especially in the low temperature condition, the rubber asphalt concrete can provide good deformation resistance, with a high temperature deformation resistance ability.This paper uses the Cooper test machine to 30℃, 40℃and 50℃of the creep test, through the extraction of relevant parameters, analysis of the viscoelastic properties of asphalt rubber. Under the same temperature, the rubber asphalt concrete creep deformation were less than 90 # asphalt concrete, which indicated that the rubber powder to improve the asphalt concrete creep properties. Through the calculation of the unloading rebound modulus, found in relatively low temperature conditions, two kinds of asphalt concrete modulus of resilience of difference is not big, but at high temperature rubber asphalt concrete modulus of resilience is far higher than the 90 # asphalt concrete, indicated that the rubber asphalt concrete high temperature advantages.