Method for testing interfacial bond behavior of road asphalt mixture

Abstract

The invention discloses a method for testing interfacial bond behavior of a road asphalt mixture, filling the blank of a method for testing interfacial bond behavior of asphalt and aggregate in an asphalt mixture under the conditions of freezing and thawing cycle, temperature aging, pressure aging and ultraviolet radiation aging. According to the technical scheme, the method comprises the following steps: performing sample preparation on an asphalt mixture; performing water freezing and thawing, salt freezing and thawing, temperature aging, pressure aging, ultraviolet radiation aging and three-point bending test on a semicircular test piece; and testing strain fields such as interfacial bond degenerative process, interfacial crack conditions, crack development tendency and interfacial debonding between the asphalt and aggregate specific to the influence of different asphalt mixtures on different aging conditions and different freezing and thawing cycle conditions, and calculating to obtain interfacial bond behavior fracture energy and fracture toughness property. According to the method, materials and grading types of the asphalt mixtures can be selected under different conditions, so that a scientific basis is provided for quality inspection and engineering characteristic evaluation of asphalt pavement material products in cold, strong ultraviolet ray districts.

Description

technical field [0001] The invention relates to a test method for the bond performance of materials, in particular to a test method for the interface bond performance of asphalt mixtures. Including ordinary asphalt and modified asphalt mixture under the action of rotary film oven aging, pressure aging, ultraviolet aging, water freezing and deicing salt erosion freeze-thaw cycle, the interface fracture energy and fracture toughness index test of asphalt and aggregate. It belongs to the field of road construction. Background technique [0002] Asphalt mixture is the basic material for paving asphalt pavement, and the interface bonding performance between asphalt and aggregate directly affects the performance and service life of asphalt pavement. Asphalt mixture is a complex multi-phase, multi-scale heterogeneous particle-reinforced composite material, which is composed of asphalt binder and aggregate, and the scale of each component varies from microns to centimeters. The pe...

AI Technical Summary

Problems solved by technology

Scanning electron microscopy (SEM) can observe the microstructure of asphalt mixture interface, but it can only observe the damaged interface, and it cannot be used with test loading equipment to study the change of the interface during the failure process. The mixture is anisotropic, and the test of its interface failure process is of great significance to the final failure result. Therefore, the SEM method has the disadvantage that the failure process cannot be studied; the optical interference technology test method uses the interference principle of light to test the sample. The degree of damage is tested, and the test process has high requirements for light, and the light is easily disturbed by external factors during the test, which makes the test process more complicated and the result is not easy to achieve. At the same time, it is impossible to collect real-time data on the damage process of the specimen; The laser speckle test method is widely used in stress and strain testing in solid mechanics due to its advantages of uniform spot formation, high quality spot formation, and stable light. However, due to the high energy of the spots formed by laser speckle, The surface temperature of the test piece is high, and the asphalt mortar in the asphalt mixture is prone to fluid properties at high temperatures, which eventually leads to structural damage of the test piece, which has a great impact on the test results, so laser speckle testing is not suitable for roads Asphalt