Warm mix recycled asphalt mixture with high RAP (Reclaimed Asphalt Pavement) mixing amount and high performance and preparation method of warm mix recycled asphalt mixture

Abstract

The invention provides a warm mix recycled asphalt mixture with a high RAP (Reclaimed Asphalt Pavement) mixing amount and high performance and a preparation method of the warm mix recycled asphalt mixture, and belongs to the technical field of highway construction materials. The mixture is prepared from the following components in percentage by mass: 50 to 70 percent of RAP material, 28.2 to 47.2 percent of aggregate and 1.8 to 2.8 percent of newly-doped asphalt and warm mix regenerant; the content of the warm mix regenerant is 0.3 to 0.5 percent of the mass of the newly-doped asphalt. The preparation method comprises the following steps of reclaiming and stacking of the RAP material, crushing and screening of a reclaimed material, stacking and detection of a reference material in different bins, and preparation of the warm mix recycled asphalt mixture. The RAP material, the aggregate, the asphalt and the warm mix regenerant are taken according to the requirement of raw material proportioning and are subjected to mixing treatment according to a conventional production technique of a hot-mixed asphalt mixture, wherein the mixing temperature is 120 to 140DEG C, and the mixing time is 20 to 35s, and finally the recycled asphalt mixture is obtained. The warm mix recycled asphalt mixture has the advantages of high RAP mixture ratio, low heating and constructing temperature, good constructability, easiness and pavement performance, low energy consumption, low emission and the like.

Description

technical field [0001] The invention relates to a high-RAP content high-performance warm-mix recycled asphalt mixture and a preparation method thereof, belonging to the technical field of road construction materials. Background technique [0002] For a long time, the warm-mix recycling technology of asphalt mixture has been one of the hot research directions in the field of road engineering. Especially with the sustained and rapid development of my country's national economy, after experiencing large-scale road construction, the focus of the road industry has gradually shifted to the large and medium repair and maintenance of roads, and a large amount of recycled asphalt pavement materials (referred to as "RAP material"), about 4% of the RAP material is bitumen, and 96% is aggregate of various grades. Waste asphalt has a certain use value, if it is discarded directly, it will not only cause serious waste of resources, but also go against the protection of the ecological envi...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a high RAP mixing technology in view of the current situation of low RAP content, high mixing temperature, high energy consumption, and low utilization rate of old asphalt pavement materials in the existing recycled asphalt mixture mixing technology. Quantitative high-performance warm-mix recycled asphalt mixture and its preparation method, through the pretreatment of old materials and the use of warm-mixing agent, increase the amount of RAP in road warm-mix recycled asphalt mixture, reduce mixing temperature and energy consumption, and solve the problem of asphalt recycled asphalt mixture The problem of poor performance of material path

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