High-performance concrete pavements enhanced by hybrid fibers

A high-performance concrete and hybrid fiber technology, applied in the field of pavement materials, can solve the problems of reducing fiber reinforcement effect, reducing fiber strength, and low bonding force, so as to improve tensile and flexural strength, reduce cracks, and passivate stress concentration Effect

Inactive Publication Date: 2016-07-27
宁波时科新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, polypropylene coarse fibers are hydrophobic and have low adhesion to concrete, thus greatly reducing the reinforcing effect of the fibers
In order to improve the bonding force between fibers and concrete, fibers are often subjected to heterogeneous treatment or surface indentation treatment, but this treatment will seriously reduce the strength of fibers

Method used

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  • High-performance concrete pavements enhanced by hybrid fibers
  • High-performance concrete pavements enhanced by hybrid fibers
  • High-performance concrete pavements enhanced by hybrid fibers

Examples

Experimental program
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Embodiment Construction

[0020] Preferred embodiments of the present invention are described in detail below.

[0021] A hybrid fiber-reinforced high-performance concrete pavement is prepared by first mixing one or more of a mechanical modifier, a silane coupling agent, and an inorganic modified filler with polypropylene particles in proportion, and then melt-stretching. into modified polypropylene coarse fibers; then put the modified polypropylene coarse fibers and polymer fine fibers into the concrete and mix them well until they are uniform. The hybrid fiber concrete specimens were prepared according to the test standards, poured after full mixing, and cured in a water bath for 28 days. Table 1 shows the specimen information of mixed fiber reinforced concrete, in which control group 1 is plain concrete, control group 2 is concrete reinforced with modified polypropylene coarse fibers, and control group 3 is concrete reinforced with polymer fine fibers; Table 2, 3 and 4 respectively characterize the...

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Abstract

The invention discloses high-performance concrete pavements enhanced by hybrid fibers and particularly discloses pavement concrete to which modified polypropylene crude fibers and polymer micro fibers are added.The modified polypropylene crude fibers are prepared in a mode that an organic modifying agent, a silane coupling agent and inorganic modified filler are subjected to melt-spinning and cold-stretching after being modified.The modified polypropylene crude fibers can effectively limit and delay generation and development of macrocrack; the polymer micro fibers can block expansion of original defects and micro cracks of concrete.The modified polypropylene crude fibers and the polymer micro fibers work in a cooperative mode, a hybrid effect can be generated, and crack resistance, stretch resistance, impact resistance, wear resistance, seepage resistance, bending resistance, fatigue resistance, shrinkage resistance, corrosion resistance, freeze thawing resistance and the like of concrete are greatly improved.The concrete can be widely applied to concrete pavements, such as a road pavement, a bridge floor, an airfield pavement, an urban road pavement, a port pavement, a traffic tunnel and an industrial building ground, engineering quality of the concrete pavements is remarkably improved, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of pavement materials, and relates to a concrete pavement, in particular to a high-performance concrete pavement added with mixed fibers. Background technique [0002] Asphalt and concrete are the most commonly used pavement materials at home and abroad. Asphalt pavement is favored by many countries in the world for its good mechanical properties, flat and wear-resistant surface, smooth and comfortable driving performance, short construction period and easy maintenance and repair. However, asphalt pavement is a flexible pavement. In road sections with high temperature, heavy traffic, and many heavy-duty vehicles, asphalt pavement is very prone to permanent deformation and plastic flow, resulting in concave-convex deformation of the pavement structure layer and poor durability. Concrete pavement is a rigid pavement with good strength, stiffness, stability and durability, so it is widely used in various pavement projec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B16/06C04B14/38C04B20/00C04B111/34
CPCC04B14/386C04B16/0633C04B16/0658C04B16/0683C04B16/0691C04B20/0052C04B2111/0075C04B2111/20C04B2111/27C04B2111/343C04B2111/346
Inventor 石峰殷石
Owner 宁波时科新材料科技有限公司
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