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Plant-mixed hot recycled asphalt mixture and its preparation method

A technology of asphalt mixture and heat regeneration, which is applied in the field of road engineering, can solve the problems such as difficulty in increasing the amount of waste and old materials, and achieve the effects of good texture, good fusion, and obvious economic benefits

Active Publication Date: 2019-01-25
HEILONGJIANG ZHONGXIN ROAD & BRIDGE MATERIAL CO LTD
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that it is difficult to increase the amount of waste and old materials in the plant-mixed heat-recycled asphalt mixture when the performance basis of the asphalt mixture is satisfied, the purpose of the invention is to provide a plant-mixed heat-recycled asphalt mixture and its preparation method. Recycled asphalt mixture has high content and high regeneration efficiency; the new mixture has uniform texture, stable performance and meets the performance requirements of hot mix asphalt mixture

Method used

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  • Plant-mixed hot recycled asphalt mixture and its preparation method
  • Plant-mixed hot recycled asphalt mixture and its preparation method
  • Plant-mixed hot recycled asphalt mixture and its preparation method

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Experimental program
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preparation example Construction

[0018] The present invention also provides a method for preparing the above-mentioned plant-mixed hot recycled asphalt mixture, comprising the following steps:

[0019] A. Put the old milling material, heavy aromatics and acrylamide into the preheating cylinder, heat it to 80-110°C, transfer it to the mixing tank, and mix it at 150-170°C for 15-30s;

[0020] B. Add new aggregate and half of new asphalt, heat to 180-200°C, and mix for 15-30s;

[0021] C. Add the other half of new asphalt, mineral powder and regenerant, heat to 180-200°C, mix for 30-60s, and take out the pot at 140-170°C to obtain factory-mixed hot recycled asphalt mixture.

[0022] In the plant-mixed heat-recycled mixture of the present invention, the original asphalt pavement is layered and milled to recover, crushed and processed into a suitable particle size, and the plant-mixed heat regeneration is carried out by adding new asphalt, regeneration agent, and new aggregates. First of all, the old milling mate...

Embodiment

[0026] The old milling material used in the experiment is the material of the same source and the same particle size. First, the old material is sampled, and then the sample is subjected to an extraction test. The asphalt content of the milling old material is 11.21%. A sieving test was carried out on the old aggregate obtained from the extraction test, and the test results are shown in Table 1. The old asphalt after the extraction test was recovered by rotary evaporation method, and the performance index test was carried out. The test results are shown in Table 2.

[0027] Table 1 Collection and distribution of old aggregate ore

[0028]

[0029]

[0030] Table 2 Determination of properties of old milling materials

[0031]

[0032] The new aggregate is limestone, and the mineral powder is limestone mineral powder. The relative density of the new aggregate was tested, and the test results are shown in Table 3.

[0033] Table 3 Experimental results of relati...

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Abstract

The invention belongs to the technical field of road engineering, and concretely relates to a plant hot-mix recycled asphalt mixture and a preparation method thereof. The plant hot-mix recycled asphalt mixture and the preparation method thereof are provided against the problem of difficult improvement of the admixture of wastes in the plant hot-mix recycled asphalt mixture on the basis of meeting the performances of the asphalt mixture. The recycled mixture comprises, by weight, 70-90 parts of milling wastes, 10-15 parts of heavy aromatic hydrocarbons, 10-15 parts of acrylamide, 15-30 parts of new aggregates, 3-6 parts of mineral powder, 3-6 parts of new asphalt and 2-5 parts of a regenerant. The recycled asphalt mixture has the advantages of high admixture and high recycling efficiency; and a new mixture has uniform texture and stable performances, and meets performance requirements of the hot-mix asphalt mixture.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a plant-mixed hot recycled asphalt mixture and a preparation method thereof. Background technique [0002] After more than ten years of rapid development of my country's highways, a large number of asphalt pavements will enter the period of major and medium repairs. Compared with traditional asphalt pavement maintenance methods, asphalt pavement regeneration can save a lot of raw materials such as asphalt and gravel, save engineering investment, and at the same time help to deal with waste and protect the environment, so it has significant economic benefits, social and environmental benefits. With people's attention to environmental protection, social benefits, and technological progress, asphalt pavement recycling technology has attracted more and more attention. [0003] Plant-mix hot recycling is a technology in which recycled cold milled pavement materia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B26/26
CPCC04B26/26C04B2201/20C04B18/167C04B24/124C04B24/00C04B14/28C04B14/04C04B14/14C04B24/08C04B24/283
Inventor 徐萌祝序博牟惠跃李文辉
Owner HEILONGJIANG ZHONGXIN ROAD & BRIDGE MATERIAL CO LTD
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