Method for predicting dynamic modulus of asphalt mixture through complex modulus of asphalt mortar

Abstract

The invention discloses a method for predicting the dynamic modulus of an asphalt mixture through the complex modulus of asphalt mortar. The method comprises the following steps: 1, constructing an asphalt mixture dynamic modulus prediction model; 2, manufacturing an asphalt mortar test mold in a prediction environment; 3, setting five working temperatures of the dynamic shear rheological test; 4, obtaining a relation curve of the angular frequency and the complex modulus of the asphalt mortar test mold at five working temperatures; 5, obtaining a relation main curve of the angular frequency and the complex modulus of the asphalt mortar test mold at the reference temperature; 6, fitting the CAM model; and 7, predicting the dynamic modulus of the asphalt mixture. According to the method, the prediction model of the dynamic modulus of the asphalt mixture is provided by utilizing the complex modulus data of multiple asphalt mastic with different powder-to-rubber ratios and the dynamic modulus data of multiple asphalt mixtures, the method can be suitable for common asphalt types, the dynamic modulus of the asphalt mixture can be predicted according to the complex modulus of the asphalt mastic, and the method is simple, rapid and high in practicability. Good application prospects are realized.

Description

Technical field [0001] The present invention belongs to the field of asphalt mixture dynamic modulus predicting technology, which involves a method of predicting asphalt mixture dynamic modular modulus through asphalt glue plural modulus. Background technique [0002] The dynamic mode of asphalt mixture is one of the parameters of the mechanical characteristics of the characteristic material derived from the theory of viscosity. The derivation of the theory of viscosity can characterize the stress strain relationship between the mixture at different temperatures and loading frequencies. However, the current mixture dynamic modulus is difficult to obtain accurately, because test asphalt mixture dynamic modulus requirements have high requirements for equipment, and the mechanics test machines that can accurately control mild dynamic loads must be accurately controlled. It is difficult to popularize in design and construction units; in the design stage, the details of the materials ...

AI Technical Summary

Problems solved by technology

At present, the dynamic modulus of asphalt mixture is often estimated directly based on past engineering experience. This method is simple to use, but the recommended modulus is only suitable for local materials and climate characteristics, and my country currently accumulates dynamic modulus engineering data. There are fewer regions and it is difficult to apply

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