Production method of polypropylene crude fiber and application method of combination polypropylene crude fiber and organic nano materials in sprayed concrete

A technology of organic nanomaterials and sprayed concrete, which is applied in the direction of single-component polypropylene artificial filament, melt spinning method, stretch spinning method, etc., can solve the problems of crack resistance, impermeability and fire resistance, which affect the safety and timely support It can reduce the waste of engineering materials, lighten the weight, and improve the bonding force and friction force.

Inactive Publication Date: 2012-11-28
林 英男
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the common practice is to use shotcrete mixed with steel fibers, but it has certain disadvantages, such as: the high price of steel fibers will lead to an increase in project cost, and there is a high rebound rate (conventional steel fiber sprayed back The elastic rate is 25%-30%), the primary spray layer is thin (usually only about 5mm), and the dust is large during spraying (the dust mass concentration is usually 270mg per cubic meter). At the same time, because the concrete contains steel fibers, the spraying construction process It is easy to damage the construction equipment, and it is easy to agglomerate and block the pipe, etc., which affects the timeliness of safety support and construction progress, and its performance in crack resistance, impermeability, and fire protection is also insufficient, and the steel fiber has poor corrosion resistance and long-term durability. not ideal
And another kind of existing construction method: Hanging steel wire mesh shotcrete also has troubles in construction, affects the timeliness of safety support, affects the construction progress, and has the disadvantages of poor corrosion resistance and unsatisfactory long-term durability.

Method used

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  • Production method of polypropylene crude fiber and application method of combination polypropylene crude fiber and organic nano materials in sprayed concrete
  • Production method of polypropylene crude fiber and application method of combination polypropylene crude fiber and organic nano materials in sprayed concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Example 1: In this example, sprayed concrete with a strength grade of CF30 is prepared, and ordinary Portland cement with the label P.O42.5R is used. The water-cement ratio is 0.48, the sand rate is 60%, and the slump is 14-18cm, use 900 parts of sand, 680 parts of gravel, 3 parts of polypropylene crude fiber, 350 parts of cement, 8 parts of organic nanomaterials, and 208 parts of water. Put the materials into the forced mechanical stirring equipment in order until they are evenly stirred , adopt the shotcrete produced by the proportioning of this embodiment, the shot rebound rate is about 7%, the thickness of a spray layer can reach more than 500mm, and the dust concentration is reduced to 30%. When it adopts the cement of ordinary silicate 42.5#, 28 The daily strength can reach more than 45Mpa.

Embodiment 2

[0054] Embodiment 2: In this embodiment, the sprayed concrete whose strength grade is CF30 is prepared, and ordinary Portland cement whose label is P.O42.5R is used, the water-cement ratio is 0.48, the sand ratio is 60%, and the slump is 14-18cm, use 942 parts of sand, 691 parts of stone, 4 parts of polypropylene crude fiber, 221 parts of cement, 11 parts of organic nanomaterials, and 260 parts of water. Put the materials into the forced mechanical stirring equipment in order until they are evenly stirred , adopt the shotcrete produced by the proportioning of this embodiment, the shot rebound rate is about 7%, the thickness of a sprayed layer can reach more than 500mm, and the dust concentration is reduced to 35%. When it adopts the cement of ordinary silicate 42.5#, 28 The daily strength can reach more than 45Mpa.

Embodiment 3

[0055] Example 3: In this example, sprayed concrete with a strength grade of CF30 is prepared, and ordinary Portland cement with the label P.O42.5R is used. The water-cement ratio is 0.48, the sand rate is 60%, and the slump is 14-18cm, use 987 parts of sand, 701 parts of stone, 5 parts of polypropylene crude fiber, 388 parts of cement, 13 parts of organic nanomaterials, and 230 parts of water. Put the materials into the forced mechanical stirring equipment in order until they are evenly stirred , adopt the shotcrete produced by the proportioning of this embodiment, the shot rebound rate is about 8%, the thickness of a sprayed layer can reach more than 500mm, and the dust concentration is reduced to 35%. When it adopts the cement of ordinary silicate 42.5#, 28 The daily strength can reach more than 45Mpa.

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Abstract

The invention discloses a production method of polypropylene crude fiber and an application method of the combination of the polypropylene crude fiber and organic nano material combined in sprayed concrete. The application method is characterized by comprising the following components in parts by weight according to the feeding sequence: 900 parts-1226 parts of sands, 680 parts-820 parts of stones, 3-14 parts of polypropylene crude fiber, 350 parts-516 parts of cement, 8 parts-60 parts of organic nano materials, 208 parts-312 parts of water and an additive, and stirring uniformly to form the sprayed concrete. In short, due to the adoption of the polypropylene crude synthetic fiber and the organic nano composite materials, the performances of crack control, permeability prevention, bending resistance, toughness, fatigue resistance, impact resistance, frost resistance and fire resistance and explosion resistance of the crude fiber sprayed concrete can be improved obviously.

Description

technical field [0001] The invention discloses a method for realizing shotcrete, in particular to a polypropylene crude fiber used in engineering applications such as railway tunnels, mine tunnels, water conservancy engineering traffic tunnels, water diversion tunnels, underground workshop caverns, engineering slopes, subways, etc. The manufacturing method and the application method of polypropylene coarse fiber and organic nanometer composite in shotcrete. Background technique [0002] In existing construction projects, such as railway tunnels, mine tunnels, water conservancy engineering traffic tunnels, water diversion tunnels, underground plant caverns, engineering slopes, subways and other engineering applications, shotcrete technology is usually used as engineering support. In the prior art, the common practice is to use shotcrete mixed with steel fibers, but it has certain disadvantages, such as: the high price of steel fibers will lead to an increase in project cost, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/08D01D5/16D01D10/02D02J3/00D01F6/06C04B28/00C04B16/06C04B24/20
Inventor 林英男
Owner 林 英男
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