A test method for moisture distribution in foamed asphalt cold recycled mixture

Abstract

The invention discloses a test method for water distribution in foamed asphalt cold recycled mixture, belonging to the technical field of road asphalt mixture test. The test method is to use a hyperspectral image acquisition system to obtain a hyperspectral image of a foamed asphalt cold recycled mixture specimen; by processing the hyperspectral image data, the moisture content of each pixel in the specimen is obtained; using a normal distribution model The moisture distribution in the specimen is fitted, and the moisture distribution characteristics in the specimen are described by the two-dimensional feature vector composed of position parameters and shape parameters. The present invention can realize accurate and high-efficiency testing of the moisture distribution in the foamed asphalt cold recycled mixture, can more comprehensively and intuitively describe the distribution characteristics and changing rules of the moisture in the foamed asphalt cold recycled mixture, and provide a basis for the subsequent optimization design of the mix ratio and Computer simulation analysis provides a solid foundation.

Description

technical field [0001] The invention belongs to the technical field of highway asphalt mixture test, and relates to a method for testing the water distribution in foamed asphalt cold recycled mixture. Background technique [0002] Foamed asphalt cold recycled mixture must add a certain amount of water during the mixing and molding process of asphalt foam and recycled mixture. This is one of the most significant differences between foamed asphalt cold recycled mixture and ordinary asphalt mixture. Asphalt foam The water consumption and mixing water consumption of the mixture are also the key design indicators of the foamed asphalt cold recycled mixture. Water is the carrier for the uniform dispersion of foamed asphalt in the mixture. However, the higher the water content, the better the dispersion effect of foamed asphalt and the better the performance of the mixture. Excessive moisture will over-wet the surface of the mixture, resulting in a decrease in the intercalation fo...

AI Technical Summary

Problems solved by technology

[0003] At present, gravimetric method, neutron small-angle diffraction method, CT scanning imaging method, etc. are mostly used in the water distribution test of foamed asphalt cold recycled mixture, but each method has its own defects.

Although the gravimetric method is simple to operate, the error is too large; the neutron source required for small-angle neutron diffraction tests is generally a neutron reactor or a metamorphic neutron source, which requires nuclear fuel, which makes the test difficult and the test risk is huge; CT scan imaging In the process of signal conversion, tiny signals are easily lost in the process of digital-to-analog / analog-to-digital conversion, and its imaging accuracy is limited, and it cannot reflect micro-water droplets smaller than 10 microns.

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