Tongji University

Mingchen Li

Lijun Sun

Liping Liu

Qingbing Lu

Lingxiao Liu

The present disclosure provides a method and system for quantifying a degree of blending of virgin and aged asphalt in HRAM. The method includes the following steps: first, constructing a relational equation between the microscale modulus of recycled asphalt in a fully blended state and the content of the aged asphalt; measuring the microscale modulus of the recycled asphalt, the microscale modulus of the aged asphalt, the microscale modulus of the virgin asphalt, and the content of the aged asphalt in the HRAM in situ; inputting the dates above into the relational equation to obtain the microscale modulus of the recycled asphalt in the fully blended state; and based on the microscale modulus of the recycled asphalt measured in situ and the microscale modulus of the recycled asphalt in the fully blended state, obtaining the degree of blending of the virgin and aged asphalt in the HRAM.

Method and system for quantifying degree of blending of virgin and aged asphalt in hot recycled asphalt mixtures (HRAM)

The present invention provides a method for preparing a hot-mixed asphalt mixture, and relates to the technical field of road engineering. In the present invention, asphalt and aggregates are preheated separately, where the aggregates include coarse aggregates and fine aggregates; the coarse aggregates, part of the fine aggregates and asphalt that are preheated are subjected to a first mixing to obtain a first mixture; the remaining fine aggregates are added to the first mixture for a second mixing to obtain a second mixture; and a mineral powder is added to the second mixture for a third mixing, and discharging is conducted to obtain a hot-mixed asphalt mixture.

Method for preparing hot-mixed asphalt mixture

Disclosed is a method for determining a mixing temperature of an asphalt mixture which includes the following steps: S, obtaining a test result of surface energy of hot-melt asphalt; S, obtaining, according to a calculation formula for total adhesion work and in combination with the test result of the surface energy of the hot-melt asphalt, total adhesion work of an asphalt and aggregate interface at different mixing temperatures; S, determining a temperature range corresponding to peak values of the total adhesion work of the asphalt and aggregate interface; and S, calculating a median value of the temperature range determined in S, so as to determine an optimum mixing temperature of the asphalt mixture.

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Shanghai, China

Mingchen Li