A rapid detection method for high-temperature and low-temperature service performance of road petroleum asphalt

Abstract

The invention discloses a pavement petroleum asphalt high temperature and low temperature using performance rapid detection method, and belongs to the field of pavement engineering. According to the pavement petroleum asphalt high temperature and low temperature using performance rapid detection method, a dynamic shear rheometer is adopted, organic combination of time scanning and frequency scanning is realized, and asphalt high temperature performance and low temperature performance are obtained via one time of scanning experiment. The pavement petroleum asphalt high temperature and low temperature using performance rapid detection method comprises following steps: 1, dynamic shear time scanning and frequency scanning of pavement petroleum asphalt are carried out using the dynamic shear rheometer so as to obtain different asphalt frequency scanning curves in a certain temperature range; 2, a temperature-rut factor change curve is drawn for regression analysis, and asphalt high temperature evaluation is carried out; and 4, parallel displacement of different temperature scanning curves is carried out based on time-temperature equivalence principle so as to obtain displacement factors, fitting is carried out based on WLF equation derived formula, pavement petroleum asphalt glass-transition temperature is obtained via back calculation, and low temperature pavement using performance rapid determination is carried out. Compared with the prior art, the pavement petroleum asphalt high temperature and low temperature using performance rapid detection method possesses following advantages: the pavement petroleum asphalt high temperature and low temperature using performance rapid detection method is rapid, and is high in efficiency, credibility, and applicability.

Description

technical field [0001] The invention relates to the field of road engineering, and specifically provides a method for quickly detecting the high-temperature and low-temperature service performance of road petroleum asphalt. Background technique [0002] Road petroleum asphalt plays an important role in asphalt mixture, excluding the factors of mixture gradation, the behavior of asphalt binder largely determines the road performance of asphalt mixture. According to the requirements of my country's current "Technical Specifications for Asphalt Mixture Pavement Construction in Highway Engineering" (JTG F40-2004), the performance indicators of asphalt mainly include a series of indicators such as high temperature, low temperature and anti-aging indicators, among which the high temperature and low temperature performance of road petroleum asphalt is the The most important index directly related to the performance of the pavement. There are many characterization methods for asphal...

AI Technical Summary

Problems solved by technology

Unclear initial value assignment leads to poor data reproducibility, which is not conducive to promotion; in addition, some algorithms require manual participation in a large number of written calculations, the process is extremely complicated, and the parallelism is not good

[0012] Second, there is no clear range of applicable asphalt types for the corresponding derivation formula

There are many types of modified asphalt in road engineering, and the mechanical properties are extremely complex. There is no clear explanation on how to judge the applicability of asphalt to the WLF derivation equation

[0013] Third, about the rutting factor and the glass transition temperature T g The utilization of the two indicators is relatively isolated, and separate tests are used to evaluate the high-temperature and low-temperature performance of asphalt, which cannot be integrated into the same detection process. Since the mechanical behavior of asphalt follows the Boltzmann linear superposition principle, its mechanical properties are significantly affected by heating history and stress history. How to set the parameter conditions in the two processes to avoid the mutual influence of the two steps is not clear at present

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