Coarse aggregation characteristic method for emulsified asphalt cold-recycled mixture

Abstract

The invention discloses a coarse aggregation characteristic method for an emulsified asphalt cold-recycled mixture. A series of indexes and algorithms are used to research spatial distribution condition, main-axis direction and particle shape features of coarsely aggregated particles in the emulsified asphalt cold-recycled mixture. The method comprises analysis on the spatial distribution condition of the coarsely aggregated particles, analysis on the main axis direction of the coarsely aggregated particles, and analysis on the shape feature of the coarsely aggregated particles. An image of the coarsely aggregated particles is obtained on the basis of CT scanning test, spatial distribution and main axis direction of the coarsely aggregated particles in the emulsified asphalt cold-recycled mixture are analyzed, the uniformity of cold-recycled test pieces in different molding manners and different grading as well as compacting effects in the different molding manners are evaluated, the indexes of the flatness ratio FER, the angularity index AI and the surface texture index STI of the roughly aggregated particles are calculated, and the shape feature of the roughly aggregated particles in a cold material is compared with that in a hot material.

Description

technical field [0001] The invention relates to a coarse aggregate characteristic analysis method of emulsified asphalt cold recycled mixture, mainly through a series of indicators and algorithms to study the spatial distribution of coarse aggregate particles in emulsified asphalt cold recycled mixture, the direction of the main axis and the particle shape characteristic. Background technique [0002] According to the applicant's knowledge, the emulsified asphalt in-situ cold recycling technology adopts special recycling unit equipment to mill and regenerate the old asphalt pavement, which can recycle 100% of the old asphalt mixture, and only add new aggregate when necessary To adjust the gradation of cold recycled mixture. After long-term road use and the external environment, as well as the mechanical action in the milling regeneration process, the edges and corners of the surface of the old material particles are polished, but as the particles are broken, a new broken su...

AI Technical Summary

Problems solved by technology

Further research shows that the main axis direction of the aggregate particles of the rotating specimen tends to be horizontal, while the distribution of the main axis direction of the aggregate particles of the rubbing specimen is less uniform

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