A method for preparing curb stones from pavement recycled materials and the prepared curb stones

Abstract

The invention relates to the technical field of recycling of building materials, in particular to a method for preparing curb stones from recycled pavement materials and the prepared curb stones. The method comprises the steps of mixing pavement reclaimed materials with different particle sizes and a magnetizer in a certain proportion, and then performing electromagnetic heating to prepare a road curb green body. Compared with the current situation where the old material is low in content and basically coarse aggregate, this method realizes 100% utilization of RAP material, fully utilizes the recycled fine material with relatively high asphalt content, and saves the new asphalt in the preparation process. The addition of the material greatly reduces the cost; the electromagnetic heating method is simpler than the existing heating and mixing method, and avoids the defect of easy sticking to the pot due to the high asphalt content in the recycled material.

Description

technical field [0001] The invention relates to the technical field of recycling of building materials, in particular to a method for preparing curb stones from recycled pavement materials and the prepared curb stones. Background technique [0002] With the development of the economy and the increase of traffic volume and axle load, more and more pavement diseases appear on the asphalt pavement, such as cracks, potholes, ruts, looseness, etc. The road surface gradually enters the period of medium repair and overhaul. The renovation of the original road surface is basically by milling or excavating the original road surface, and then adding new asphalt pavement. This process can obtain a large amount of recycled asphalt pavement from the original road surface. (RAP). According to estimates, the asphalt pavement old materials produced annually in major and medium repair projects of trunk roads alone amount to 160 million tons. RAP materials piled up like mountains, on the on...

AI Technical Summary

Problems solved by technology

RAP materials piled up like mountains, on the one hand, occupy a large area and are difficult to handle, affecting the surrounding environment, which is not conducive to the coordinated development of resources and the environment; on the other hand, old asphalt and old aggregates have utilization value. Still increasing the use of new aggregates and new asphalt will not only increase the cost of the road surface, but also increase the construction cost

[0003] The existing method of making curbstones from pavement recycled materials is generally heating waste materials-mixing-adding new asphalt-pouring into molds to form. This method is cumbersome to operate. Adhesion during the process, so the use of fine aggregates with relatively high asphalt content is limited, and in order to compensate for the loss of asphalt during the heating process, new asphalt needs to be added during mixing, and in order to ensure product adhesion, prepare raw materials Binders will also be added to increase the cost

[0004] In view of the outstanding problems existing in the current recycling of pavement materials, industry insiders concluded that: first, the utilization rate is low, and the total recycling rate of old materials is less than 30%; The amount is less than 30%, and all of them are coarse aggregates (due to the high content of asphalt in fine aggregates, secondary aging is caused during the heating process and it is easy to be bonded in the heating cylinder); the third is that the use value is low, and the asphalt surface material It is used as backfilling material for grass roots or even roadbeds, and expressway pavement materials are used for low-grade highways; fourth, the research and development of recycling technology, materials and equipment are backward, lacking comprehensive and systematic research, and the research and development of new materials and new equipment in various special links is far behind not meet actual needs

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