A test method for measuring the characteristic parameters of an interface transition zone of asphalt mixture

Abstract

The invention discloses a test method for measuring the characteristic parameters of an interface transition zone of asphalt mixture. According to the phenomenon of mechanical property changes existing in an interface transition zone between aggregate and asphalt mortar, the method utilizes a nanoindentor to perform a micromechanical property test at the interface between the aggregate and the mortar in an asphalt mixture sample, equidistantly sets measuring points from the aggregate phase to the asphalt mortar phase to obtain the load-indentation depth curve of each point, calculates a modulus value, determines the number of the measuring points according to the modulus and indentation depth changing trend of each measuring point, and estimates the thickness of the interface transition zone by combining the distribution and interval of the measuring points, and therefore, the sticking coefficient of the interface transition zone can be calculated, and the quantitative characterizationof the thickness, mechanical properties, interaction strength and other characteristic parameters of the aggregate-asphalt mortar interface transition zone can be realized.

Description

technical field [0001] The invention relates to the technical field of asphalt mixture microstructure and mechanical properties, in particular to a test method for measuring characteristic parameters of an asphalt mixture interface transition zone. Background technique [0002] Interface transition zone of asphalt mixture: The interface phase or the interface transition zone is an important part of the composite multiphase material, which has an important influence on the properties of the composite material. Asphalt mixture is a typical composite material composed of asphalt, aggregate, mineral powder, etc. There is an interfacial transition zone between the aggregate phase and the asphalt mortar phase composed of asphalt and mineral powder. From the micro-mechanism point of view, the damage of asphalt mixture under the comprehensive action of temperature, humidity and external load can be generally divided into two types: adhesive damage and cohesive damage. Cohesive damag...

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Problems solved by technology

However, the commonly used macroscopic performance experiments in existing studies cannot characterize the interfacial transition zone and its related properties at the microscopic level, and it is also difficult for various microscopy techniques to distinguish the interfacial transition zone from the asphalt cement phase due to similar composition and microscopic morphology. , which seriously hinders the characterization and exploration of the interfacial transition zone, resulting in a clear gap in the researchers' understanding of the asphalt mixture interface transition zone.

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