Method for testing moisture distribution in foamed asphalt cold recycled mixture

Abstract

The present invention discloses a method for testing moisture distribution in a foamed asphalt cold recycled mixture, and belongs to the technical field of highway asphalt mixture tests. According tothe testing method, a hyperspectral image collection system is used for obtaining a hyperspectral image of a foamed asphalt cold recycled mixture test piece; a moisture content of each pixel in the test piece is obtained by processing hyperspectral image data; fitting is performed on moisture distribution states in the test piece by using a normal distribution model, and moisture distribution characteristics in the test piece are described by using a two-dimensional characteristic vector consisting of a position parameter and a shape parameter. According to the testing method, the moisture distribution in the foamed asphalt cold recycled mixture can be accurately and efficiently tested, and moisture distribution characteristics and a moisture distribution change rule in the foamed asphaltcold recycled mixture can be described more comprehensively and directly, thereby providing a solid foundation for a subsequent proportioning optimization design and computer simulation analysis.

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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