A Method for Determining Optimum Foaming Conditions of Modified Asphalt by Viscosity

Abstract

The invention discloses a method for determining the optimum foaming condition of modified asphalt through viscosity, comprising the following steps: determining the optimum foaming temperature T SBS and T RUB ;Calculate the optimal viscosity range; test the viscosity of the asphalt to be tested, and calculate the temperature T corresponding to the optimal viscosity range 1 ~T 2 , and the temperature T corresponding to the median value of the viscosity range mid ;Determine the optimal water consumption of the asphalt to be tested, carry out the foaming test under the proposed range of water consumption, calculate the viscosity energy of each water consumption in the same time period, and the water consumption when the viscosity energy changes the most is the optimal foaming water Quantity w opt . The present invention utilizes the existing foaming data, and the foaming temperature can be directly determined by the viscosity of the asphalt to be tested, and the test variables are reduced from two to one, which greatly reduces the amount of experiments; the direct index affecting the mixing effect ( Viscosity energy) replaces the traditional indirect index as the basis for determining the optimal water consumption, and the obtained results have better consistency with the actual mixing effect, which is beneficial to reduce the mixing temperature of the warm mix.

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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