A fiber-increased and viscosified micro-surface overlay

A technology of micro-surfacing and micro-surfacing mixture, which is applied in the field of asphalt road maintenance, can solve the problems of little research on the bonding performance of micro-surfacing overlays, the influence of micro-surfacing overlay service life, and the movement of micro-surfacing overlays. and other problems, to achieve superior impermeability, improve road performance, and improve the effect of interlayer bonding performance

Inactive Publication Date: 2017-05-24
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although micro-surfacing can significantly improve the comprehensive performance of the original pavement, some current engineering research shows that micro-surfacing related technologies still need further research.
In some parts of western and northern parts of my country, the temperature in winter is very low. During the popularization and application of micro-surface overlays in these areas, they face the test of low-temperature crack resistance performance, and often have cracks or cracks caused by low-temperature cracking. Low-temperature cracking is more likely to occur in the case of sudden temperature drop or large temperature difference, which will seriously affect the service life of the micro-surface overlay
In addition, the overlay on the micro-surface of the original pavement is a thin-layer structure. Under the combined action of vertical load and horizontal load, the tangential stress generated may As a result, it is necessary to improve the bonding performance between the micro-surfacing overlay and the original pavement. However, there are few studies on the bonding performance of the micro-surfacing overlay.

Method used

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  • A fiber-increased and viscosified micro-surface overlay
  • A fiber-increased and viscosified micro-surface overlay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 0.4g of water-based epoxy resin and 0.2g of neoprene latex to 200g of anionic emulsified asphalt, and stir well to obtain an interlayer adhesive. A 300mm×300mm×50mm AC-13 asphalt concrete slab was formed with a rutting plate trial mold to simulate the original asphalt pavement, and the interlayer adhesive was evenly applied to the asphalt concrete slab with a brush.

[0018] The sepiolite fibers were soaked in nitric acid with a mass fraction of 98% for 6 hours, washed with water, and then heated at 400°C for 3 hours to obtain surface-treated sepiolite fibers.

[0019] Then mix 250 parts of aggregate, 25 parts of cationic emulsified asphalt, 7 parts of cement, 0.125 parts of pitch-based carbon fiber, 0.125 part of surface-treated sepiolite fiber and 20 parts of water to prepare the micro-surface mixture, And spread the just-mixed micro-surface mixture rapidly onto the above-mentioned rut plate that has been brushed with the interlayer adhesive, and scrape it flat wi...

Embodiment 2

[0022] Add 0.5g of water-based epoxy resin and 0.7g of neoprene latex to 300g of anionic emulsified asphalt, and stir well to obtain an interlayer adhesive. A 300mm×300mm×50mm AC-13 asphalt concrete slab was formed with a rutting plate trial mold to simulate the original asphalt pavement, and the interlayer adhesive was evenly applied to the asphalt concrete slab with a brush.

[0023] The sepiolite fibers were soaked in 98% nitric acid for 7 hours, washed with water, and heated at 430°C for 4 hours to obtain surface-treated sepiolite fibers.

[0024] Then according to 250 parts of aggregate, 26 parts of cationic emulsified asphalt, 7 parts of cement, 0.1 part of pitch-based carbon fiber, 0.2 part of surface-treated sepiolite fiber and 19.6 parts of water, the micro-surface mixture is mixed by weight percentage, And spread the just-mixed micro-surface mixture rapidly onto the above-mentioned rut plate that has been brushed with the interlayer adhesive, and scrape it flat with ...

Embodiment 3

[0027] Add 0.6g of water-based epoxy resin and 1.4g of neoprene latex to 400g of anionic emulsified asphalt, and stir well to obtain an interlayer adhesive. A 300mm×300mm×50mm AC-13 asphalt concrete slab was formed with a rutting plate trial mold to simulate the original asphalt pavement, and the interlayer adhesive was evenly applied to the asphalt concrete slab with a brush.

[0028] The sepiolite fibers were soaked in 98% nitric acid for 8 hours, washed with water, and heated at 460°C for 5 hours to obtain surface-treated sepiolite fibers.

[0029] Then according to 250 parts of aggregate, 27 parts of cationic emulsified asphalt, 7 parts of cement, 0.1 part of pitch-based carbon fiber, 0.3 part of surface-treated sepiolite fiber and 19.2 parts of water, the micro-surface mixture is mixed by weight percentage, And spread the just-mixed micro-surface mixture rapidly onto the above-mentioned rut plate that has been brushed with the interlayer adhesive, and scrape it flat with ...

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Abstract

The invention discloses a fiber-added and tackified micro-surfacing overlay, which belongs to the technical field of asphalt road maintenance. According to the technical scheme of the invention, the fiber-added and tackified micro-surfacing overlay is characterized in that an interlayer bonding agent and a micro-surfacing mixture are laid on an asphalt pavement in sequence from bottom to top, wherein the interlayer bonding agent is composite modified anionic emulsified asphalt; and the micro-surfacing mixture is a composite fiber modified micro-surfacing mixture. The technical process of the micro-surfacing overlay material is applicable to maintenance of the asphalt pavements in low temperature regions under heavy-load channelized traffic conditions and has the advantages of outstanding low temperature crack resistance and good interlayer bonding performance.

Description

technical field [0001] The invention belongs to the technical field of asphalt road maintenance, and in particular relates to a fiber-increased and viscosified micro-surface overlay. Background technique [0002] With the increase of the age of asphalt pavement in our country, the increase of traffic volume, and under the action of complex climate factors, the asphalt pavement is prone to early disease phenomena such as cracks, ruts, potholes, and anti-skid performance attenuation. These diseases seriously affect the The service level of asphalt pavement has become an important subject that needs to be solved urgently in the field of highway engineering research. Thin-layer overlay maintenance technology can effectively restore the flatness of the original asphalt pavement, improve the anti-skid ability, and increase the comfort and safety of driving. In the thin-layer overlay maintenance technology, micro-surfacing is widely used in the maintenance construction of high-gra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C7/24C04B26/26
Inventor 张庆蒋凯白正宇汪德才杨林房立黄茹梦石敏宋世理
Owner HENAN NORMAL UNIV
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