Testing method for interface adhesion performance of road asphalt mixture

Abstract

The invention discloses a testing method for the interface adhesion performance of a road asphalt mixture. The method comprises the steps of performing sample preparation on original asphalt; performing short-term aging and sample preparation; performing pressure aging and sample preparation; performing a water freezing and thawing testing and salt freezing and thawing testing; preparing an aggregate test specimen; testing surface free energy parameters of asphalt and the aggregate test specimen; determining the asphalt and aggregate interface adhesion performance; comparing interface adhesion performance indexes of various asphalt and aggregates on different conditions so as to select asphalt road materials suitable for being used under different climate environments. According to the testing method, asphalt and aggregate interface adhesion work on the drying condition, peeling work of an asphalt and aggregate interface on the water condition and a water stability index determined by the ratio of the adhesion work to the peeling work can be effectively calculated and obtained for different asphalt and aggregates under the different temperatures, aging conditions and different freezing and thawing cycle condition effects; scientific basis is provided for quality inspection and engineering characteristic evaluation of a cold region asphalt road material product.

Description

technical field [0001] The invention relates to a test method for the adhesion performance of materials, in particular to a test method for the interface adhesion performance between asphalt and aggregates. Including ordinary asphalt and modified asphalt mixture under the action of rotary film oven aging, pressure aging, temperature, water freezing and deicing salt erosion freeze-thaw cycle, the adhesion work of asphalt and aggregate interface, peeling work and water stability index test. It belongs to the field of road construction. Background technique [0002] Asphalt mixture is the basic material for paving asphalt pavement, and the interface adhesion 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 centimet...

AI Technical Summary

Problems solved by technology

The principle of water boiling method and water immersion method is to reflect the interface adhesion performance by testing the percentage of asphalt and aggregate peeling area. This method has the following problems: it is affected by human subjective factors, and the error is large. Due to the small aggregate area, The irregular area is complex, so it is difficult to measure the percentage of the peeled area. Since this method is carried out in constant temperature water under certain conditions, the test of the peeled area is more difficult due to the refraction of water. Therefore, the boiling method and the water immersion method are not the same. Not advisable; photoelectric colorimetry is to place a certain amount of asphalt mixture samples in an aqueous dye solution of known concentration, and the bare surface of the aggregate peeled off due to water immersion will absorb the dye, so that the concentration of the dye in the aqueous solution will decrease. Measuring the change of dye concentration, so as to judge the state of interface bonding

However, since the mechanics theory, chemical reaction theory, molecular orientation theory, electrostatic theory and surface structure theory are suitable for describing the adhesion mechanism of asphalt and mineral materials qualitatively, and the calculation of evaluation indexes of these theories is very complicated, specific index sizes should be used It is not easy to measure the adhesion of asphalt and mineral aggregates