Method for testing interfacial strength between semi-flexible pavement asphalt mixture skeleton and cement mortar

Abstract

The invention provides a method for testing interfacial strength between a semi-flexible pavement asphalt mixture skeleton and cement mortar and belongs to the technical field of pavement material strength test. The problem that the interfacial mechanical strength between a semi-flexible pavement asphalt mixture skeleton and cement mortar is difficultly tested by the current test method is solved.The method disclosed by the invention comprises the following steps: manufacturing a semi-flexible pavement test piece through a laboratory test by adopting a nano-indenter test method; performing test sample cutting treatment on the semi-flexible pavement according to test instrument requirements, and selecting a sample with representative material interface characteristic for later use; and finally, performing indentation test on the sample characteristic interface by using a nanoindentor, thereby obtaining the interfacial mechanical strength characteristics of the semi-flexible pavement characterized by mechanical parameters of the material interface, such as hardness, elasticity modulus, creep function, fracture toughness, interface bonding force and the like. The method disclosed bythe invention has the characteristics of being simple, convenient and intuitive and can be promoted to evaluation of service conditions of the built pavement, the test parameters can be docked with anumerical simulation method, and development of the numerical simulation method is promoted.

Description

technical field [0001] The invention relates to a method for testing the interface strength of a semi-flexible pavement asphalt mixture skeleton and cement mortar, and belongs to the technical field of pavement material strength testing. Background technique [0002] Semi-flexible pavement is a new type of composite pavement structure formed by pouring special cement mortar with good fluidity and high strength based on open-graded large-void asphalt mixture. Semi-flexible pavement combines the advantages of seamless flexible pavement and high driving comfort with the advantages of strong bearing capacity, wear resistance and durability of rigid pavement. [0003] Semi-flexible pavement is more complex than ordinary pavement due to its paving method and constituent materials, and its strength formation mechanism is also quite different from that of asphalt pavement and cement pavement, and the mechanical behavior at the interface is even more complicated. [0004] The resear...

AI Technical Summary

Problems solved by technology

[0011] The purpose of the present invention is to provide a method for testing the interface strength of asphalt mixture skeleton and cement mortar on semi-flexible pavement. By performing nano-indentation test and analysis on the cross-section interface of existing semi-flexible pavement test pieces, it is difficult to test semi-flexible pavement with current test methods. The problem of mechanical strength of asphalt mixture skeleton and cement mortar interface provides new ideas for the study of microscopic mechanics of pavement materials

[0013] In order to solve the current difficulty in testing the interface strength between the asphalt mixture skeleton and cement mortar on semi-flexible pavements, the present invention uses a nano-indentation test method to first make semi-flexible pavement test pieces through indoor tests; It is required to cut the test sample, and select a sample with representative material interface characteristics for backup; finally, use a nano-indentation instrument to perform an indentation test on the characteristic interface of the sample to obtain the elastic modulus, creep, and interface bonding force of the material interface and other mechanical parameters, and analyze and process the parameters