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Crack self-healing bituminous concrete and preparation method thereof

An asphalt concrete, self-healing technology, applied in the field of asphalt concrete, can solve problems such as the influence of the self-healing ability of asphalt pavement cracks

Active Publication Date: 2012-11-21
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although all kinds of fibers can block the crack propagation of asphalt pavement, and can play a certain anti-cracking effect after adding, fibers with different physical and chemical properties and asphalt have different interactions and form different bonding interfaces. Different crack resistance mechanisms will also be produced under the action of load and deformation, which will have different effects on the crack self-healing ability of asphalt pavement

Method used

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  • Crack self-healing bituminous concrete and preparation method thereof
  • Crack self-healing bituminous concrete and preparation method thereof
  • Crack self-healing bituminous concrete and preparation method thereof

Examples

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preparation example Construction

[0018] The invention provides the preparation method of the above-mentioned crack self-healing asphalt concrete, including material preparation, mixing and molding processes, such as figure 1 As shown, the specific steps are as follows:

[0019](1) Material preparation: The quality of coarse aggregate, fine aggregate and filler is weighed in proportion according to the median value of densely graded asphalt concrete AC-13 gradation specified in JTG F40-2004, and the coarse aggregate, fine aggregate and filler Put them in an oven at 105°C±5°C and dry to constant weight; test the density of mineral aggregates and asphalt with various particle sizes according to the method specified in JTJ 052-2000 Test Procedures for Asphalt and Asphalt Mixtures in Highway Engineering; and then according to JTG F40— 2004 Appendix B.6 determines the asphalt ratio of asphalt concrete composed of coarse aggregate, fine aggregate, filler and asphalt, and the asphalt ratio of the crack self-healing c...

Embodiment 1

[0025] This embodiment provides a method for preparing crack self-healing asphalt concrete.

[0026] (1) Material preparation: The quality of porous basalt aggregates with a particle size of 1.18mm or more, limestone aggregates with a particle size of 1.18mm or less and finely ground limestone powder shall be in accordance with the densely graded asphalt concrete AC-13 grade specified in the specification JTG F40-2004 Mixing (see Table 1) median value is weighed in proportion, porous basalt aggregate, limestone aggregate and finely ground limestone powder are placed in an oven at 105°C ± 5°C and dried to constant weight; Test the density of porous basalt aggregates, limestone aggregates, ground limestone and heavy traffic AH-70 asphalt by the method specified in JTJ 052-2000 in the test procedure for mixtures (see Table 2); then determine according to JTG F40-2004 Appendix B.6 The asphalt ratio of the asphalt concrete composed of porous basalt aggregate, limestone aggregate, g...

Embodiment 2

[0040] The same part of this example and Example 1 will not be repeated, the difference is that 0.5% wt of the total mass of the porous basalt aggregate, limestone aggregate, ground limestone powder and heavy traffic AH-70 asphalt is mixed with steel fiber .

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Abstract

The invention relates to a crack self-healing bituminous concrete and a preparation method thereof. The bituminous concrete comprises coarse aggregate, fine aggregate, fillers, pitch, rigid fiber and flexible fiber, wherein the mixing amount of the rigid fiber is 0.50-2.5wt.% of the total amount of the coarse aggregate, the fine aggregate, the fillers and the pitch, and the mixing amount of the flexible fiber is 0.10-0.35wt.% of the total amount of the coarse aggregate, the fine aggregate, the fillers and the pitch. The preparation method of the concrete comprises the steps of weighing dried aggregates, placing the aggregates in a material containing disk, mixing the aggregates uniformly, preheating in a drying oven to the temperature of 180 DEG C, and heating the fillers separately to the temperature of 180 DEG C; preheating the pitch to the temperature ranging between 160 DEG C and 175 DEG C; drying the rigid fiber and the flexible fiber respectively for backup use according to the requirement; and firstly mixing the rigid fiber into the mixed aggregate with blending, then blending the aggregate and the liquid pitch, then blending with the fillers, then blending with the flexible fiber, and finally forming the bituminous concrete. According to the bituminous concrete and the preparation method, the low-temperature cracks of bituminous pavements are reduced to the minimum and can be healed spontaneously, early-stage cracking is avoided effectively, the service life of the bituminous pavements is prolonged, and the project implementation is convenient.

Description

technical field [0001] The invention relates to asphalt concrete, in particular to a rigid-flexible fiber composite modified asphalt concrete capable of improving the crack resistance of asphalt pavement and a preparation method thereof. Background technique [0002] Cracks are one of the most important diseases of asphalt pavement. The generation of cracks not only destroys the integrity, continuity and aesthetics of the pavement, but also creates conditions for freeze-thaw and water damage, which eventually leads to structural damage of the asphalt pavement, and has to invest a lot of manpower and material resources for repair or reconstruction. [0003] There are many factors that affect the quality of asphalt pavement, among which the performance of materials directly affects the function and service life of the pavement. Therefore, it is necessary to design an asphalt mixture with good comprehensive pavement performance and excellent crack resistance by starting with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/26C04B16/06C04B14/48
Inventor 高丹盈汤寄予赵军朱海堂张启明
Owner ZHENGZHOU UNIV
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