Test method for determining blending degree of new and old asphalt in cold recycling mixture

Abstract

The invention belongs to the technical field of cold recycling asphalt pavement of urban roads, airport roads, highways and the like, and particularly relates to a test method for determining the blending degree of new and old asphalt in a cold recycling mixture. Firstly, emulsified asphalt or foamed asphalt made of decolorized asphalt is used as new asphalt after water evaporates, the new asphaltand the old asphalt are fully blended in different proportions, color of the blended asphalt is collected and stored as standard chroma, and other test materials are prepared; then mixing and stirring are carried out according to the design ratio, the chroma of the cold recycling mixture is collected, and the proportion of the old asphalt in the asphalt of the mineral aggregate surface is obtained by comparing the chroma of the cold recycling mixture with the standard chroma; and finally, the blending degree of the new asphalt and the old asphalt is calculated according to a formula. By usingthe test method, the mixing state of the old asphalt and the new asphalt of the cold recycling asphalt mixture can be determined quickly and accurately, and therefore, the production technology can be improved and the mixing ratio of materials can be adjusted so as to improve the useperformance of the cold recycling asphalt pavement and prolong the service life of the cold recycling asphalt pavement.

Description

technical field [0001] The invention belongs to the technical field of cold recycled asphalt pavement of urban roads, airport roads and highways, and in particular relates to a test method for measuring the blending degree of new and old asphalt in cold recycled mixtures. Background technique [0002] my country's road development has shifted from "construction-oriented" to "construction and maintenance" in an all-round way. The existing roads with a total mileage of nearly 5 million kilometers have more than 90% of their pavement structure as asphalt pavement. The designed service life of asphalt pavement usually does not exceed 15 years. In engineering practice, under the joint action of natural environment and heavy traffic, asphalt pavement is prone to aging and damage. Therefore, many high-grade highway asphalt pavements in our country have entered a large-scale maintenance period. The maintenance and renovation of asphalt pavement will produce about 100 million tons o...

AI Technical Summary

Problems solved by technology

In cold recycled asphalt mixture, RAP is usually used as a mineral material. The old asphalt in RAP cannot be effectively integrated and function with emulsified asphalt or foamed asphalt, which will not only cause waste of resources, but also hinder cold recycled asphalt The mixing and compaction of the mixture will cause the void ratio of the formed pavement to be too large and the degree of compaction to be insufficient, which may lead to early defects such as rutting and water damage on the cold recycled asphalt pavement

Therefore, how to accurately measure the mixing state of new and old asphalt in cold recycled asphalt mixture has become very important. However, for cold recycled asphalt mixture, there is still a lack of effective and fast test methods and methods to measure the mixing state of old and new asphalt. Accurate Measurement and Research

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