Emulsified asphalt concrete material cured by microwave heating and its preparation method

A technology of emulsified asphalt and microwave heating, which is applied in construction, roads, road repairs, etc. It can solve problems such as difficulty in realization, failure to open traffic as soon as possible, difficulties in emulsifiers and emulsification stabilization additives, etc., and achieve easy and convenient construction and compaction The quality is easy to control and the effect of breaking through the limitation of heat preservation conditions

Inactive Publication Date: 2011-12-28
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the wide variety of asphalt properties produced in various places, one emulsifier cannot adapt to all different types of asphalt emulsification, which brings difficulties to the production of emulsified asphalt, resulting in premature splitting and demulsification of emulsified asphalt during transportation and storage, resulting in material Great waste, increasing the cost of emulsified asphalt application
[0005] Secondly, due to the wide variety of aggregates in various places, when the stable emulsified asphalt is sprayed with aggregates, it will immediately break the emulsion, which will bring difficulties to the uniform mixing of concrete and reduce the adhesion between emulsified asphalt and aggregates.
In order to reasonably control the timing of emulsified asphalt demulsification, it is necessary to develop a special emulsifier and emulsification stabilizer for each aggregate, which is difficult to achieve in the actual application process and brings great difficulties to the promotion of emulsified asphalt concrete materials.
[0006] Third, the emulsified asphalt still contains water after the concrete is formed, and it needs to be completely evaporated to produce sufficient cohesive force, which results in low early strength of the emulsified asphalt concrete and cannot be opened to traffic as soon as possible, which is also an important aspect of the emulsified asphalt concrete pavement One of the disadvantages
[0007] Fourth, it is not only necessary to satisfy emulsified asphalt in the process of storage and transportation without breaking the emulsification, but also meet the timely breaking of aggregates, which is contradictory; at the same time, it is necessary to adapt to various types of asphalt and aggregates of different lithologies. The development of general-purpose emulsifiers and emulsification stabilizers has brought great difficulties, which further affects the road performance of emulsified asphalt concrete materials

Method used

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  • Emulsified asphalt concrete material cured by microwave heating and its preparation method
  • Emulsified asphalt concrete material cured by microwave heating and its preparation method
  • Emulsified asphalt concrete material cured by microwave heating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In the preparation of emulsified asphalt mixture, based on the total mass of the mixture, aggregate accounts for 84%, mineral powder accounts for 4%, cement accounts for 3%, and emulsified asphalt accounts for 9%; the gradation (mass ratio) is shown in Table 1.

[0035] Table 1 Aggregate grading table

[0036]

[0037] Raw material selection:

[0038] Aggregate: Basalt aggregate produced in Zhejiang, with a density of 2.821g / cm 3 , Adhesion to asphalt is grade 4, crush value is 10.1%, particle size is 0.075mm~9.5mm, continuous gradation;

[0039] Mineral powder: Limestone ore powder produced in Jingyang, Shaanxi, with a density of 2.711g / cm 3 , The hydrophilic coefficient is 0.83;

[0040] Cement: P.O42.5R cement produced by Shaanxi Qinling Cement Co., Ltd., with qualified stability and strength grade meeting the requirements of "General Portland Cement Standard" (GB175-2007).

[0041] Emulsified asphalt with microwave heating demulsification: the stability is less than 2% for 5 d...

Embodiment 2～12

[0048] The raw materials and their mass mixing ratios of the concrete in Examples 2-12 are shown in Table 3. The concrete was produced according to the preparation method described in Example 1, and the demulsification time and final molding temperature are shown in Table 4.

[0049] Table 3 The mass ratio of concrete raw materials (%)

[0050]

[0051] Table 4 Demulsification temperature and final pressure temperature of concrete

[0052]

[0053] Test example:

[0054] The emulsified asphalt mixture specimens formed in Examples 1-12 were placed at room temperature for 3 days, and the road performance test was carried out with reference to "Test Regulations for Highway Engineering Asphalt and Asphalt Mixtures" (JTJ052-2000).

[0055] Determination of Marshall stability

[0056] Using a Marshall compactor, the hammer weight is 4536g, and the free fall height is 457.2mm. According to the degree of compaction, the initial compaction is 25 times on both sides of the specimen to reach 50% ...

Embodiment 13

[0076] According to the concrete raw material ratio in Example 1, Example 13 was prepared according to the conventional emulsified asphalt concrete production method. The curing age was the same as that of Example 1. The road performance is shown in Table 9.

[0077] Table 9 Results of concrete road performance test

[0078]

[0079] Table 9 shows that, compared with emulsified asphalt concrete prepared by conventional production methods, the road performance of emulsified asphalt concrete heated by microwave is greatly improved.

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Abstract

The invention discloses a microwave heated and cured emulsified asphalt concrete material and a preparation method thereof. The emulsified asphalt concrete comprises the following components by mass: 79%-88% of basalt or limestone aggregate, 3%-6% of limestone mineral powder, 1%-4% of ordinary portland cement, 8%-11% of microwave heated and demulsified emulsified asphalt. The preparation method consists of the steps of: mixing the aggregate, mineral powder and cement at normal temperature for 1min, adding the microwave heated and demulsified special emulsified asphalt, and mixing the mixture for 2min, spreading out and pre-pressing the mixture to compactness of 50%, conducting microwave heating to a temperature above 50DEG C and implementing demulsification for draining, continuing heating the mixture to a temperature above 100DEG C, and carrying out final pressing, thus obtaining the concrete material. The method of the invention employs demulsification for draining after microwave heating as well as final pressing for curing, so that the demulsification time of the emulsified asphalt is controllable, and the pavement performance of the emulsified asphalt concrete is greatly improved. Being green and environmentally friendly as well as construction convenient, the method provided in the invention is suitable for application of the emulsified asphalt concrete to high-grade pavement layers, rapid pavement maintenance, asphalt concrete factory prefabrication, and other fields.

Description

Technical field [0001] The present invention involves an emulsifiers for emulsion asphalt concrete materials paved on the road surface, especially a macro -heated emulsified asphalt concrete material and their preparation methods. Background technique [0002] Microwave is an electromagnetic wave with frequency from 300MHz ~ 300GHz.Under the action of a microwave electromagnetic field, the polar molecules in the medium material have changed from the original heat movement state to the intercharge of the microwave electromagnetic field.high.Microwave heating is currently the most advanced asphalt pavement material heating method. It has the advantages of fast speed, uniform heating, small temperature gradient, low calories, no light fire, no weak seams and weaknesses, high repairs and no pollution, and other pollution.It can realize the repetitive use of old asphalt materials, meet the requirements of national energy conservation, emission reduction, and environmental protection, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B26/26E01C19/02E01C19/10
Inventor 赵鹏王振军艾涛袁斌赵仕兵
Owner CHANGAN UNIV
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