Hot in-plant reclaimed asphalt mixture

Abstract

The invention relates to a hot in-plant reclaimed asphalt mixture. The mixture includes the following components by mass percent: 30 to 50 percent of milling materials, 44 to 67 percent of newly collected materials, 1.5 to 4 percent of mineral powder, 1.5 to 4 percent of new asphalt, and ARA regenerant which is 0 to 10 percent of the mass of the recycled asphalt contained in the milling materials.The processing method includes the following steps: (1) extraction and analysis of the milling materials; (2) asphalt performance test; (3) regenerant addition; (4) formation of mixture of the recycled asphalt; (5) Marshall test or rotary compacting test; and (6) mixture performance test. The proportion of milling material RAP reaches as high as 50 percent in the engineering application of the hot recycled asphalt mixture, the milling material RAP can be applied to a middle layer, and the proportion is higher than the proportions of other hot recycled mixtures by more than 20 percent. The mixture can be applied to various grades, such as the AC type, SUPERPAVE, and the like, and the RAP proportion can respectively reach 30 percent or even more than 50 percent. When the mixture is used forpaving a road surface, the road performance can respectively meet the requirements on performance of a newly proportioned asphalt mixture, and the high temperature performance is even superior to thenewly proportioned asphalt mixture. Therefore, the invention has obvious economic benefit.

Description

Technical field [0001] The invention relates to a road paving mixture, in particular to a plant-mixed hot recycled asphalt mixture. Background technique [0002] After more than ten years of rapid development of highways in my country, a large number of asphalt pavements will enter the period of large and medium repairs. Compared with traditional asphalt pavement maintenance methods, asphalt pavement regeneration can save a lot of raw materials such as asphalt, sand and gravel, save engineering investment, and at the same time help treat waste materials and protect the environment, so it has significant economic and social and environmental benefits. With people's attention to environmental protection, social benefits, and technological advancement, asphalt pavement recycling technology has attracted more and more attention. [0003] There are many types of asphalt pavement regeneration technologies, and hot plant mixing regeneration is currently the most widely used asphalt pavem...

AI Technical Summary

Problems solved by technology

Although certain researches have been carried out in individual provinces and cities, some equipment manufacturers have also developed equipment for thermal plant mixed regeneration. Some units and institutions try to use more mature equipment and methods from abroad, but due to climate conditions and the nature of raw materials And construction technology and other reasons, the effect is not ideal

Generally speaking, due to the lack of systematic analysis and mature technology in China, it is still not possible to produce a hot mix asphalt mixture with good performance under the condition of using a large amount of waste materials.

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