Method for determining optimal foaming condition of modified asphalt through viscosity

Abstract

The invention discloses a method for determining the optimal foaming condition of modified asphalt through viscosity. The method comprises the following steps: determining the optimal foaming temperature TSBS and TRUB; calculating an optimal viscosity range; testing the viscosity of the asphalt to be tested, and calculating the temperature T1 to T2 corresponding to the optimal viscosity range andthe temperature Tmid corresponding to the median of the viscosity range; determining the optimal water consumption of asphalt to be measured, performing a foaming test in a planned water consumption range, calculating the viscosity energy of each water consumption in the same time period, and the water consumption when the viscosity energy change is maximum being the optimal foaming water consumption wopt. According to the method, the foaming temperature of the asphalt to be tested can be directly determined through the viscosity of the asphalt to be tested by utilizing the existing foaming data, and two test variables are reduced to one test variable, so that the experimental quantity is greatly reduced. The direct index (viscosity energy) influencing the mixing effect replaces the traditional indirect index to be used as the basis for determining the optimal water consumption, and the obtained result has better consistency with the actual mixing effect, thereby being beneficial to lowering the mixing temperature of the warm-mixed mixture.

Description

technical field [0001] The invention discloses a method for determining the optimum foaming condition of foamed asphalt, which belongs to the technical field of road engineering. Background technique [0002] In recent years, the construction of high-grade highways in my country has been continuously intensified, and the mileage of highway maintenance has continued to increase. Roads are the lifeblood of my country's infrastructure, and a large number of engineering projects are put into construction every year. However, at present, the hot mixing method is still mainly used to produce the mixture, which not only consumes a lot of fuel, but also emits a large amount of harmful gas and dust, which seriously affects the environment and poses a hazard to the health of construction workers. Warm mixing technology can greatly reduce the emission of harmful gases and smoke. Compared with hot mix asphalt mixture, relevant studies have shown that the production temperature of warm...

AI Technical Summary

Problems solved by technology

Although the expansion rate has a certain relationship with the viscosity of foamed asphalt, it does not fully reflect its viscosity, because the expansion rate is also related to the surface tension of the asphalt

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