Method for evaluating dispersion uniformity of basalt fibers in light-transmitting asphalt mixture

Abstract

The invention discloses a method for evaluating dispersion uniformity of basalt fibers in a light-transmitting asphalt mixture. The method comprises the following steps: step 1, preparing a basalt fiber epoxy asphalt mixture test piece with good light-transmitting performance; step 2, performing slice cutting on the prepared and formed test piece; 3, under the irradiation of a white light lamp, a high-definition camera is used for shooting the cut piece, and a two-dimensional section image is obtained; step 4, extracting a fiber bundle cluster in the image by adopting image processing software, and defining a characteristic index for evaluating the fiber dispersion degree at the same time; and step 5, judging the dispersion uniformity grade of the basalt fibers in the light-transmitting asphalt mixture according to the characteristic indexes. According to the method for evaluating the dispersion uniformity of the basalt fibers in the light-transmitting asphalt mixture, the dispersion uniformity of the basalt fibers in the light-transmitting asphalt mixture can be quantitatively analyzed, and a theoretical basis and a practical reference are provided for further improving the pavement performance of the basalt fiber asphalt mixture.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for evaluating the uniformity of basalt fiber dispersion in basalt fiber light-transmitting asphalt concrete. Background technique [0002] At present, the commonly used asphalt in my country is a thermoplastic black organic polymer compound material. When encountering high temperature, the traditional asphalt will have a relative displacement with the aggregate in the mixture. Such displacement will help repair some fine cracks in the mixture. , but at the same time the traditional asphalt mixture will also produce some diseases, such as rutting, crowding and so on. As a new type of asphalt mixture, high toughness cold mix epoxy asphalt mixture is very different from the commonly used asphalt mixture in performance and function. Different from traditional asphalt, high toughness cold mix epoxy asphalt is a transparent or translucent thermosetting material. Un...

AI Technical Summary

Problems solved by technology

However, the basalt fibers currently used in road engineering are mainly clustered or cloth-shaped in actual engineering. If the undispersed bundled fibers are directly added to the mixture for mixing, they will not be easily dispersed in the formed epoxy asphalt mixture. It has been proved that uneven fiber dispersion in asphalt mixture will significantly reduce the road performance and service life of the mixture

The theory of fiber spacing clearly points out that the prerequisite for fibers to play a role is that the fibers have good dispersion in the mixture. However, due to the limitation of technical means, there is still a lack of methods for directly evaluating the dispersion form of basalt fibers in asphalt mixtures. The dispersion in epoxy asphalt mixture will significantly affect the road performance and service life of epoxy asphalt concrete

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