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Method for measuring working time of plant mixed emulsified asphalt cold recycled mixtures

A technology of cold recycled mixture and emulsified asphalt, applied in the direction of material inspection products, etc., can solve the problems of relying on subjective judgment and the results vary greatly, and achieve the effect of easy mastery and simple operation

Inactive Publication Date: 2019-03-29
GANSU CHANGLONG HIGHWAY MAINTENANCE TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is no unified method for determining the working time of emulsified asphalt cold recycled mixture, which mainly depends on subjective judgment, which leads to great differences in the results obtained by different testers

Method used

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  • Method for measuring working time of plant mixed emulsified asphalt cold recycled mixtures
  • Method for measuring working time of plant mixed emulsified asphalt cold recycled mixtures

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Embodiment

[0027] Example A method for measuring the working time of emulsified asphalt cold recycled mixture, comprising the following steps:

[0028] ⑴Preparation plant mixed emulsified asphalt cold recycled mixture:

[0029] 4.0 parts of emulsified asphalt (3.0% emulsifier), 1.5 parts of cement, 1.5 parts of mineral powder, 3.0 parts of pre-wet water, 80 parts of milling material, and 10 parts of crushed stone (parts by weight, the total mass is 4050g). Then add the milling material and gravel to the asphalt mixture mixing pot in proportion, add pre-wet water, and stir for 90 seconds; then add emulsified asphalt, and stir for 90 seconds; finally add mineral powder and cement, and stir for 90 seconds to complete the preparation. Repeat the above steps to complete the preparation of 9 parts of mixture mixture.

[0030] Start the timer after each mix is ​​blended.

[0031] ⑵ Loading samples to simulate the transportation process:

[0032] Place a Φ148mm×20mm circular stainless steel g...

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Abstract

The invention relates to a method for measuring working time of plant mixed emulsified asphalt cold recycled mixtures. The method comprises the following steps of: (1) mixing a plant mixed emulsifiedasphalt cold recycled mixture according to a designed mix proportion, and starting timing; (2) placing a circular stainless steel gasket in in a circular test mold, loosening the mixed cold recycled mixture into the test mold for levelling, placing another circular stainless steel gasket on the mixture and balancing the weight, and simulating the transplantation process of the mixture in a material vehicle; (3) simulating a paving process after placing the mixture together with the test mold at a specified health temperature for prescribed health time; (4) loading the poured mixture into a rotary compaction test mold in three layers and carrying out tamping for 25 times; (5) simulating the compaction process; (6) carrying out demolding, measuring the height of a molded test piece and preserving the heat; and (7) testing the splitting strength of the molded test piece at 25 DEG C to determine a time from the beginning of the molded piece corresponding to the maximum splitting strength AT 25 DEG C to the compaction completion time as the working time of the mixture. The method is simple to operate and accurate.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a method for measuring the workable time of a plant-mixed emulsified asphalt cold recycled mixture. Background technique [0002] The success or failure of the plant-mixed emulsified asphalt cold recycled mixture technology is closely related to the working time of the emulsified asphalt. If the paving and rolling of the mixture is carried out before the working time is reached, the final cohesion of the mixture is only provided by the emulsified asphalt which is mechanically rolled to promote demulsification, which will affect the formation of the final strength of the mixture; If the mixture is rolled after a while, it will appear that the mixture cannot be formed, rolled and sticky, or even loose and unable to form strength. Therefore, the determination of working hours is particularly important. [0003] At present, there is no unified method for determining the workable tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/42
CPCG01N33/42
Inventor 曹青霞张军林马元功张富奎魏定邦赵静卓王晖丁民任国斌吴来帝魏强王雪娟陈鹏雷鹏斗
Owner GANSU CHANGLONG HIGHWAY MAINTENANCE TECH RES INST CO LTD
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