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A kind of micro-nano fiber reinforced concrete and preparation method thereof

A fiber reinforced concrete technology, applied in the field of building materials, can solve the problems of affecting the mechanical properties of concrete, fiber agglomeration, affecting the bonding force between fibers and substrates, etc., to enhance mechanical properties and durability, improve pore structure, and dense microstructure. Effect

Active Publication Date: 2020-10-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although fiber is an ideal concrete reinforcement material, during the doping process, the fiber is prone to agglomeration, which greatly affects the bonding force between the fiber and the base material, and affects the mechanical properties of concrete.

Method used

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  • A kind of micro-nano fiber reinforced concrete and preparation method thereof
  • A kind of micro-nano fiber reinforced concrete and preparation method thereof
  • A kind of micro-nano fiber reinforced concrete and preparation method thereof

Examples

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preparation example Construction

[0043] The preparation method of concrete reinforced with micro-nano fibers includes the process of preparing nanofibers by electrospinning; specifically, the electrospinning process includes: adding a polymer to a solvent and magnetic stirring to obtain an electrospinning solution; electrospinning The silk solution is added to the nozzle for electrospinning to obtain nanofibers; as an optional embodiment, the concentration of the electrospinning solution is set to 10-30%, and the time of magnetic stirring is set to not less than 6 hours; the voltage of the electrospinning Set it to 10-30kV, set the propulsion speed of the spinning solution to 0.3-5mL / h, set the receiving distance from the spinneret to the drum at 15-30cm, set the spinning environment temperature to 20-45°C, and set the relative humidity of the surrounding environment to 30-80%.

[0044] The preparation method of concrete reinforced by micro-nano fibers includes the process of modifying the surface of nanofibe...

Embodiment 1

[0047] In Example 1, the micro-nano fiber-reinforced concrete includes thermoplastic polyurethane nanofibers, polyethylene-polypropylene blended microfibers, nano-silica, and also includes coarse aggregate, fine aggregate, water, and cement. The preparation process is as follows:

[0048] The preparation of thermoplastic polyurethane nanofibers by electrospinning technology specifically includes: adding high-molecular polymers into solvents, performing magnetic stirring, as an electrospinning solution; adding the prepared electrospinning solution into the nozzle, and performing electrospinning to obtain Nanofiber membrane; dry the nanofiber membrane to fully evaporate the solvent.

[0049] Hydrophilic modification of prepared thermoplastic polyurethane nanofibers and polyethylene-polypropylene blended microfibers by plasma surface treatment method; specifically includes: using low-temperature plasma to initiate acrylic acid surface grafting on the surface of electrostatic nanof...

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Abstract

The invention discloses micro-nano fiber reinforced concrete. The concrete comprises micro fiber with the surface provided with a first hydrophilic group and nano-fiber with the surface provided witha second hydrophilic group, wherein the content of the micro fiber in the concrete is set to be 2-5%, and the content of the nano-fiber in the concrete is set to be 5-10%. The nano fiber thins thick holes by filling hole structures between cement hydration products, the hole structure in the concrete is improved, the microstructure of the concrete is more compact, and harmful hole formation is effectively limited. The reinforced concrete obtained by blending the micro fiber, the nano-fiber and cement overcomes the characteristic of multiscale fracture, the nano-fiber and the micro fiber whichhave the surfaces provided with the hydrophilic groups and have the high elastic modulus greatly improve the mechanical property of the concrete, by adding additives, the mechanical property and the durability of the concrete are further enhanced, and the micro-nano fiber reinforced concrete with high bending resistance, high strength and high toughness is obtained.

Description

technical field [0001] The application belongs to the technical field of building materials, and in particular relates to micro-nano fiber-reinforced concrete and a preparation method thereof. Background technique [0002] As the most widely used geotechnical material in the world today, concrete has been widely used in engineering fields. However, traditional concrete has disadvantages such as poor crack resistance, low toughness, and obvious brittleness, which affect the appearance and service life of buildings to a certain extent. The most important thing is that it will seriously threaten people's lives and property safety. In order to reduce the accidents caused by the defects of concrete materials, it is necessary to comprehensively improve the quality of concrete. [0003] The strength and toughness of concrete are usually improved by adding minerals, fibers and polymer materials, but there is no high-bending concrete yet. Although fiber is an ideal concrete reinfor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B16/10C04B16/06
CPCC04B16/10C04B28/00C04B14/00C04B14/062C04B16/0675C04B16/0625C04B20/006
Inventor 李从举
Owner UNIV OF SCI & TECH BEIJING
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