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Preparation method of regenerated asphalt mixture
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A technology of asphalt mixture and recycled asphalt, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of unfavorable asphalt precipitation, RAP aging, and reduce the performance of recycled asphalt mixture, so as to avoid secondary Secondary aging, short heating time, energy saving effect
Active Publication Date: 2019-09-06
YANGZHOU UNIV
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In this radiation heating method, the heat transfer process is from the outside of the RAP to its inside (from the surface to the inside), which is not conducive to the precipitation of old asphalt adsorbed by the recycled material; and the heating time is as long as 2-4 hours, resulting in RAP Further aging reduces the performance of the corresponding recycled asphalt mixture,
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[0014] A method for preparing recycled asphalt mixture, comprising the following steps:
[0015] Step 1. Heat the new aggregate, asphalt, and mineral powder to 160-165°C by means of thermal radiation heating;
[0016] Step 2. Use microwave heating to heat the recycled asphalt mixture to 150-155°C;
[0017] Step 3. Dry-mix the recycled asphalt mixture for 90s first, then add the heated new aggregate, asphalt, mineral powder and microwave-heated recycled asphalt mixture in sequence, and mix for 90s for each material added.
[0018] Step 4. Microwave the final mixed recycled asphalt mixture again, using microwave for 30s, intermittent for 30s, controlling the temperature at 150-155°C, and microwave heating for 6-8 cycles.
[0019] In a further embodiment, the mass percentage of ferric iron tetroxide in the recycled asphalt mixture in step 2 is greater than 3%.
[0020] In a further embodiment, the recycled asphalt mixture in step 2 is all kinds of old asphalt pavement binders t...
Embodiment 1
[0025] Such as figure 1 , 2 As shown, different dosages (30%, 40%, 50%) of regenerated asphalt mixture specimens were prepared by traditional heating and the present invention for comparative study.
[0026] The composition and mass ratio of AC-13 recycled asphalt mixture (30% RAP) are: 65 parts of new aggregate, 30 parts of recycled asphalt mixture, 5 parts of mineral powder, and 4.78 parts of asphalt
[0027] The composition and mass ratio of AC-13 recycled asphalt mixture (40% RAP) synthetic mineral materials are: 55 parts of new aggregate, 40 parts of recycled asphalt mixture, 5 parts of mineral powder, and 4.42 parts of asphalt
[0028] The composition and mass ratio of AC-13 recycled asphalt mixture (50% RAP) synthetic mineral materials are: 45 parts of new aggregate, 50 parts of recycled asphalt mixture, 5 parts of mineral powder, and 4.29 parts of asphalt
[0029] All the above ratios can meet the design requirements of the ratio in the "Technical Specifications for ...
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Abstract
The invention discloses a preparation method of a regenerated asphalt mixture. New aggregate, asphalt, mineral powder and other components are heated to 160-165 DEG C by using a heat radiation heatingmethod; an asphalt mixture recycled material is heated to 150-155 DEG C; the heated new aggregate, asphalt and mineral powder and microwave-heated asphalt mixture recycled material are mixed; and microwave-heating the missed regenerated asphalt mixture by using a method of 30 s of microwave heating and 30 s of intermittence, the temperature is controlled at 150-155 DEG C, and the microwave heating is carried out for 6-8 cycles to obtain the performance-enhanced regenerated asphalt mixture. According to the invention, microwave is used to heat RAP, which is short in heating time, saves a lot of energy and can greatly improve the performance of the regenerated asphalt mixture.
Description
technical field [0001] The invention belongs to road engineering technology, in particular to a method for preparing recycled asphalt mixture. Background technique [0002] At present, the recycling of RAP (waste and old asphalt mixture) is mainly applied to the surface layer of low-traffic roads and the cushion or subbase of high-grade roads with a certain amount of blending ratio. However, the aggregates recovered from the upper layer of asphalt are basically high-quality aggregates. The reason why they cannot be used in large quantities in the surface layer is that after mixing RAP, the old and new asphalt in the asphalt mixture cannot be fully integrated, resulting in the crack resistance of the asphalt pavement. , fatigue life and other related properties will have different degrees of decline. [0003] In the current RAP thermal regeneration process, the temperature of the mixture is raised to the temperature required for mixing and paving mainly through heat radiatio...
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