A method for preparing a reclaimed material mixture from waste bitumen in a large ratio

Abstract

A method for preparing a reclaimed material mixture from waste bitumen in a large ratio is disclosed. The method includes following steps: subjecting a recovered waste bitumen mixture to crushing andsieving by adopting a sieve hole size of 4.75 mm or 9.6 mm as a boundary point so as to obtain a waste fine aggregate and a waste coarse aggregate; separately detecting gradation of the fine waste aggregate and the waste coarse aggregate and the waste bitumen content in a form of a bitumen aggregate ratio; treating the waste aggregates; measuring the waste coarse aggregate treated and meeting requirements of the specifications; heating the waste coarse aggregate to 200-500 DEG C; adding the waste coarse aggregate to a blending cylinder; adding the waste fine aggregate into the blending cylinder after the waste fine aggregate is measured; adding new bitumen in a needed amount; then adding a regenerating agent the weight of which is 0.3-0.5% of the weight of the aggregates; fully stirring the mixture to reach a discharge temperature required by the current technical specifications; discharging the product; and conveying the product to a bin for later use. The method has advantages of a high waste material utilization rate, high safety, environment protection and a low cost.

Description

technical field [0001] The invention belongs to the technical field of road construction, and in particular relates to a method for preparing a large-scale waste asphalt regenerated mixture. Background technique [0002] After the road asphalt pavement has been used for a period of time, due to physical and chemical effects such as geology, hydrology, natural climate, and repeated rolling of vehicle loads, it will inevitably be damaged to varying degrees and require maintenance and repairs, or due to road upgrades, etc., will affect the original There are asphalt pavements that are abandoned or excavated. In China alone, tens of thousands of tons and hundreds of millions of tons of waste asphalt mixtures are discarded every year. This will lead to the continuous generation of waste piles that occupy land and pollute the environment, and at the same time continue to mine accordingly Tens of thousands of tons and hundreds of millions of tons of new sand and gravel are used f...

AI Technical Summary

Problems solved by technology

[0004] 1. Due to the lack of technical improvement of waste asphalt materials, the utilization rate of waste asphalt mixtures is low (≤30%), which makes the recycling value of old material resources small (the utilization rate of old materials is low in the process. in small cases or even increase the cost);

[0005] 2. During the drying process of waste asphalt mixture, a large amount of asphalt smoke will be mixed into the exhaust outlet of the drying equipment and discharged together, which is not conducive to environmental protection, and will also cause the efficiency of the dust removal system to decrease and be damaged;

[0006] 3. Since the new and old materials are equipped with independent drying systems, the equipment capital investment and heat energy consumption increase, which greatly increases the production cost of recycled asphalt mixture;

[0007] 4. In order to prevent the old asphalt from being scorched during the production process, the temperature of the old sand and gravel aggregate should not be too high, resulting in a low discharge temperature of the recycled asphalt mixture and excessive cooling during transportation, which is not conducive to paving construction;

[0008] 5. During the production process, the old asphalt mixture will adhere to the screening system due to its heating, resulting in the inability to accurately control the gradation of the recycled asphalt mixture, resulting in high quality hazards;

[0009] 6. Because the old asphalt mixture contains waste asphalt, it will adhere to equipment parts during the heating production process, and long-term use will cause equipment damage and related performance decline

[0011] The present invention aims at the shortcomings of unscientific technology, waste of resources, low utilization rate, high cost, unfavorable environmental protection, etc. existing in the current method of using old asphalt mixture. production method