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Grading method of cold recycled mixture

A cold recycled mixture and grading technology, applied in the direction of roads, road repair, roads, etc., can solve the problem of low strength, and achieve the effects of improving strength, improving grading accuracy, and increasing the proportion of additions

Inactive Publication Date: 2021-03-26
詹海强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although asphalt cold recycled mixture technology has been popularized and applied in large quantities, due to the low strength of some existing cold recycled mixtures, it can only be used for rural roads and roads that do not require high road surfaces.

Method used

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  • Grading method of cold recycled mixture
  • Grading method of cold recycled mixture
  • Grading method of cold recycled mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1: A method for grading cold recycled mixtures, wherein the cold recycled mixtures include: 16 parts of basalt stones with a particle size of 20mm-30mm, 50 parts of road milling with a particle size of 0-10mm, granules 30 parts of road milling with a diameter of 10mm-30mm, 2 parts of cement, 2 parts of mineral powder, 3.5 parts of emulsified asphalt, and 3-5 parts of water. The above materials are mixed for asphalt mixture grading, and geotechnical impact tests are carried out for different water contents. The tests are as follows:

[0046] test count Moisture content (%) Maximum dry density (g / cm 3 )

[0047] It can be seen from the above that the optimum water content in the molded cold recycled specimen is 3.8%, and the corresponding maximum dry density is 2.287g / cm 3 .

Embodiment 2

[0048] Embodiment 2: A method for grading cold recycled mixtures, wherein the cold recycled mixtures include: 16 parts of basalt stones with a particle size of 20mm-30mm, 50 parts of road milling with a particle size of 0-10mm, granules 30 parts of road milling with a diameter of 10mm-30mm, 2 parts of cement, 2 parts of mineral powder, 2.5-4.5 parts of emulsified asphalt, and 3.8 parts of water. Mix the above materials for asphalt mixture grading, and conduct splitting experiments for different amounts of emulsified asphalt. The test is as follows:

[0049] test count Amount of emulsified asphalt (%) Dry splitting strength (MPa) Wet splitting strength (MPa) 1 2.5 0.66 0.61 2 3 0.75 0.67 3 3.5 0.76 0.68 4 4 0.72 0.62 5 4.5 0.68 0.63

[0050] It can be seen from the above that the maximum dry splitting strength can be obtained when the mass fraction of the optimum emulsified asphalt is 3.5 phr in the molded cold recycled spe...

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Abstract

The invention belongs to the technical field of asphalt pavement cold recycling, and particularly relates to a grading method of a cold recycled mixture. The production method comprises the followingspecific production steps: milling an asphalt concrete surface layer, crushing and screening through a crushing and screening device to obtain milled materials with the specifications of 0-10mm and 10-30mm, and mixing the milled materials according to a certain proportion; metering the milling material prepared in the previous step through a milling material metering and conveying device, and thenconveying the milling material to a mixing device; respectively metering the new aggregate, cement, mineral powder, emulsified asphalt and water through a metering and conveying device, and conveyingthe metered materials to a mixing device. The mixing device is used for stirring the mixture, then the finished mixture is discharged to the storage bin through the discharging port of the mixing device to be temporarily stored, anti-segregation measures of the mixture are taken in the storage period, evaporation of water is prevented, and the production efficiency of the cold recycled mixture can be effectively improved by adopting the method.

Description

technical field [0001] The invention belongs to the technical field of asphalt pavement cold regeneration, and in particular relates to a gradation method of cold recycled mixture. Background technique [0002] Asphalt pavement cold recycling technology, as a road maintenance method, mills and recycles waste asphalt pavement (Rec laid aimed Asphalt Pavement, RAP for short) and adds new aggregates to meet the gradation design requirements. Cement hydration in asphalt mortar, asphalt demulsification produces cohesive force and aggregate cementation enhances cohesive force. Through construction technology and reasonable maintenance, a new flexible structural layer of asphalt mixture is formed, which reduces the generation of reflection cracks and can reach the density level. With the performance index of hot mix asphalt mixture, it has the advantages of resource saving, energy saving, emission reduction, and cost saving; it is a low-carbon, environmentally friendly and economic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C19/10
CPCE01C19/1004E01C19/1072E01C19/1077
Inventor 不公告发明人
Owner 詹海强
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