Method for measuring silt content of recycled powder of asphalt concrete

Abstract

The invention relates to the technical field of building material determination, in particular to a method for determining the silt content of asphalt concrete recycled powder. The method includes the following steps: (1) cleaning and drying or naturally drying same gravel aggregate for producing asphalt concrete, preparing stone powder with zero silt content by a test mill, performing screening, and reserving a sample for later use; (2) selecting a gravel raw material, drying a similar or same soil sample around a mine, preparing silt powder, performing screening, and preserving the prepared sample with the silt powder content of 100% for later use; (3) preparing fixed values of mixed powder with different silt powder contents according to a known ratio, putting the mixed powder into a 1000ml beaker, adding 500ml distilled water or deionized water, carrying out a methylene blue test, determining methylene blue MB values corresponding to the different silt powder contents, and making a standard curve for later use through linear fitting; and (4) measuring the methylene blue MB value of the asphalt concrete recycled powder according to the method in the step (3), carrying out backward deduction according to a standard curve or a linear fitting formula, and quantitatively analyzing the content of the silt powder in the asphalt recycled powder.

Description

technical field [0001] The invention relates to the technical field of measuring building materials, in particular to a method for measuring the mud content of recycled asphalt concrete powder. Background technique [0002] The production of asphalt concrete fine aggregate in Southwest China is mainly produced by machine-made sand. However, the content of stone powder in machine-made sand is relatively high (usually about 13%). Calculated per ton of asphalt concrete produced, it produces about 35kg of recycled asphalt concrete powder. According to the existing standard, the maximum amount of asphalt concrete recycled powder can not exceed 25% of the total mineral powder content. Calculated according to the total mineral powder content of 5%, about 22.5kg of asphalt concrete recycled powder is produced per ton of asphalt concrete. The annual small-scale asphalt concrete is calculated based on the production capacity of 600,000 tons of asphalt concrete, and 13,500 tons of soli...

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