Polyformaldehyde fiber improved geopolymer recycled concrete

A technology of recycled concrete and polyoxymethylene fibers, which is applied in cement production and other directions, can solve the problems of inability to distribute uniformly, reduce strength and toughness, and be expensive, achieve high practical value and promotion value, improve long-term stability, and excellent alkali resistance. Corrosive effect

Inactive Publication Date: 2020-11-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the relatively large weight of steel fiber, the dispersion effect is not good, and it cannot be evenly distributed in concrete, and the price is expensive, which limits its application.
However, glass fiber is unstable in alkaline medium, and the durability of glass fiber concrete is poor. Its strength and toughness will be reduced due to atmospheric corrosion, and it will gradually degenerate into ordinary concrete.

Method used

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  • Polyformaldehyde fiber improved geopolymer recycled concrete
  • Polyformaldehyde fiber improved geopolymer recycled concrete
  • Polyformaldehyde fiber improved geopolymer recycled concrete

Examples

Experimental program
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Effect test

Embodiment

[0013] This embodiment proposes a polyoxymethylene fiber with flexural strength to improve geopolymer recycled concrete and its improvement method. Common synthetic fibers include polypropylene fiber, polyacrylonitrile fiber, polyvinyl alcohol fiber, polyoxymethylene (POM) fiber etc. In this embodiment, considering the addition of polyoxymethylene fiber to the recycled concrete of geopolymer to prepare polyoxymethylene fiber geopolymer recycled concrete, this embodiment selects polyoxymethylene fibers with a length of 6 mm and 12 mm, and studies that the volume content of polyoxymethylene fibers is 0 respectively. %, 0.25%, 0.5%, 0.75%, and 1% of the mechanical properties of geopolymer recycled concrete, and their formula ratios are shown in the table below:

[0014]

[0015]

[0016] In the present embodiment, the polyoxymethylene fiber physical performance parameters are as follows:

[0017] Fiber type Length (mm) Diameter (μm) Density (g / cm 3 )

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Abstract

The invention discloses a polyformaldehyde fiber improved geopolymer recycled concrete. Polyformaldehyde fibers with a length of 6 mm or 12 mm and a total mass ratio of 0.25%-1% are added. Through theabove scheme, polyformaldehyde fibers are doped into concrete, the reinforcing effect on the flexural strength, compressive strength and ductility of concrete is remarkable, the excellent alkali corrosion resistance of polyformaldehyde fibers can resist alkalinity in the concrete, the long-term stability of the concrete is improved, and the polyformaldehyde fibers have a very high practical valueand popularization value in the technical field of geopolymer recycled concrete.

Description

technical field [0001] The invention relates to the technical field of geopolymer concrete, in particular to polyoxymethylene fiber-improved geopolymer recycled concrete. Background technique [0002] Geopolymer recycled concrete (GRC) is a new type of green concrete material that uses geopolymers to completely replace cement as a cementitious material, and at the same time, uses recycled aggregates to replace natural aggregates in whole or in part. GRC not only recycles waste concrete, reducing CO2 emissions during concrete production, but also utilizes industrial waste such as fly ash. And studies have shown that recycled aggregates are more suitable for use in geopolymer concrete, and the mechanical properties of geopolymer recycled concrete are better than ordinary concrete and ordinary recycled concrete. However, like ordinary concrete, geopolymer recycled concrete has disadvantages such as high brittleness, low tensile strength, and unstable volume. The fiber can imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06
CPCC04B16/0675C04B28/006C04B18/04C04B14/00C04B18/08C04B12/04C04B22/062C04B22/002Y02P40/10
Inventor 石宵爽杨富花代金芯栾晨晨张聪梁永宸
Owner SICHUAN UNIV
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