Sampling method of solution method for asphalt component separation

Abstract

The invention discloses a sampling method of a solution method for asphalt component separation. The sampling method comprises the steps that a round-bottom flask is weighed; matrix asphalt is added to the round-bottom flask; activated normal heptane is added to the round-bottom flask; heating and mixing are conducted to allow the matrix asphalt to be sufficiently dissolved in activated normal heptane; the matrix asphalt is boiled, transferred to a dark place for standing, and filtered with filter paper to form a filtrate; the filtrate is subjected to constant volume with activated normal heptane; a plurality of parts of isometric filtrate subjected to the constant volume are measured; reduced pressure distillation is conducted for removing activated normal heptane; and then corresponding parts of asphaltene-free asphalt samples are obtained. The sampling method solves the problems that the sampling is inaccurate in the existing asphalt component separation sampling, and the aging is caused by repetitive heating of the asphalt. With the adoption of the sampling by the solution method, multiple parts of asphalt samples for a component separation experiment can be obtained once; the operation is simple; the sampling is uniform; the experiment efficiency and the accuracy and reliability of an experiment result are improved; and pollution to experiment instruments is reduced.

Description

technical field [0001] The invention relates to a solution method sampling method for separation of asphalt components. Background technique [0002] According to the provisions of asphalt chemical composition test in highway engineering asphalt and asphalt mixture test regulations (JTG E20-2011), it is necessary to weigh 1 ± 0.1g (m) of the sample (for samples with less than 10% asphaltene) or 0.5±0.01g (for samples with more than 10% asphaltene), accurate to 0.1mg. In the existing sampling process, first heat and melt the asphalt in the vat until there is no obvious stagnation when stirring with a glass rod, then pour it into a stainless steel rice tank or porcelain evaporating dish, and put the asphalt in the oven before doing the asphalt four-component experiment Heat to 135°C, after the asphalt is completely melted (until there is no obvious stagnation when stirring with a glass rod), take it out and pour it into a 19# ground-mouth Erlenmeyer flask with constant weight...

AI Technical Summary

Problems solved by technology

Although the heated asphalt becomes slightly thinner, the softening time is extremely short, requiring the experimenter to take samples as soon as possible (within 1 minute), the human error is large, and the asphalt is easy to contaminate other instruments such as electronic balances during sampling

At the same time, the specification requires that "the same sample should be tested in parallel at least twice". Since there is no special sampling method, the asphalt needs to be reheated each time, which makes the asphalt very easy to age, seriously affects the content of component separation, and makes the experimental data inaccurate

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