Steel fiber/polymer fiber dual-fiber reinforced concrete and preparation method thereof

A fiber-reinforced, polymer technology, applied in the field of concrete, can solve the problems of reduced concrete strength and no contribution to concrete strength, and achieves the effect of less initial cracks, no construction procedures and processes, and broad promotion prospects.

Inactive Publication Date: 2011-03-16
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of polymer fibers does not contribute to the improvement of the strength of concrete. On the contrary, the addition of a large amount of polymer fibers has a certain effect on the strength of concrete.

Method used

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  • Steel fiber/polymer fiber dual-fiber reinforced concrete and preparation method thereof
  • Steel fiber/polymer fiber dual-fiber reinforced concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Raw materials for preparing steel fiber / polymer fiber double fiber reinforced concrete:

[0029] (1) Cement: Ordinary Portland cement with a strength grade of 32.5;

[0030] (2) Sand: river sand, apparent density 2.65g / cm 3 , bulk density 1400kg / m 3 , porosity 47.2%, mud content 1%, fineness modulus 2.8, medium sand;

[0031] (3) Crushed stone: artificially rolled granite crushed stone, particle size <20mm;

[0032] (4) Steel fiber: sheared steel fiber, length 30mm, equivalent diameter 0.69mm, aspect ratio 45, tensile strength > 755MPa;

[0033] (5) Polymer fiber: polypropylene fiber or polyacrylonitrile fiber, bundled monofilament, length 12 / 19mm, diameter 20 / 38μm, tensile strength > 500MPa;

[0034] (6) Water reducer: KJ-5 high-efficiency water reducer, high concentration, powder.

[0035]The preparation method of steel fiber / polymer fiber double fiber reinforced concrete is as follows:

[0036] (1) Clean the sand and gravel and keep them in a dry state;

[003...

Embodiment 2

[0043] Raw materials for preparing steel fiber / polymer fiber double fiber reinforced concrete:

[0044] (1) Cement: Ordinary Portland cement with a strength grade of 32.5;

[0045] (2) Sand: river sand, apparent density 2.65g / cm 3 , bulk density 1400kg / m 3 , porosity 47.2%, mud content 1%, fineness modulus 2.8, medium sand;

[0046] (3) Crushed stone: artificially rolled granite crushed stone, particle size <20mm;

[0047] (4) Steel fiber: sheared steel fiber, length 30mm, equivalent diameter 0.69mm, aspect ratio 45, tensile strength > 755MPa;

[0048] (5) Polymer fiber: polypropylene fiber or polyacrylonitrile fiber, bundled monofilament, length 12 / 19mm, diameter 20 / 38μm, tensile strength > 500MPa;

[0049] (6) Water reducer: KJ-5 high-efficiency water reducer, high concentration, powder.

[0050] The preparation method of steel fiber / polymer fiber double fiber reinforced concrete is as follows:

[0051] (1) Clean the sand and gravel and keep them in a dry state;

[00...

Embodiment 3

[0058] Raw materials for preparing steel fiber / polymer fiber double fiber reinforced concrete:

[0059] (1) Cement: Ordinary Portland cement with a strength grade of 32.5;

[0060] (2) Sand: river sand, apparent density 2.65g / cm 3 , bulk density 1400kg / m 3 , porosity 47.2%, mud content 1%, fineness modulus 2.8, medium sand;

[0061] (3) Crushed stone: artificially rolled granite crushed stone, particle size <20mm;

[0062] (4) Steel fiber: sheared steel fiber, length 30mm, equivalent diameter 0.69mm, aspect ratio 45, tensile strength > 755MPa;

[0063] (5) Polymer fiber: polypropylene fiber or polyacrylonitrile fiber, bundled monofilament, length 12 / 19mm, diameter 20 / 38μm, tensile strength > 500MPa;

[0064] (6) Water reducer: KJ-5 high-efficiency water reducer, high concentration, powder.

[0065] The preparation method of steel fiber / polymer fiber double fiber reinforced concrete is as follows:

[0066] (1) Clean the sand and gravel and keep them in a dry state;

[00...

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Abstract

The invention relates to steel fiber / polymer fiber dual-fiber reinforced concrete and a preparation method thereof, and the preparation method is as follows: pouring cement, sand and stones into a mixing device according to the weight ratio of 1: 1.45-2.20: 1.78-2.73, further putting steel fiber into the mixture according to the steel fiber-concrete volume ratio of 0.6-0.8%: 1, and mixing uniformly; preparing water according to the water-cement weight ratio of 0.30-0.48:1, putting a high-efficient water reducing agent into the mixture according to the high-efficient water reducing agent-cement weight ratio of 0.3-1.2%: 1, putting into the water according to the proportion of 0.6-1.2kg polymer fiber per 1m3 concrete, stirring uniformly and obtaining the mixture; and putting the mixture into a concrete mixing device, stirring uniformly and then obtaining the steel fiber / polymer fiber dual-fiber reinforced concrete. The concrete has excellent quality and can be applied in the fields of rigid bridge deck pavement of concrete bridges and overlaying of old cement and concrete pavements.

Description

technical field [0001] The invention relates to concrete used for rigid paving of concrete bridge decks and overlaying of new and old cement concrete road surfaces, in particular to steel fiber / polymer fiber double-fiber reinforced concrete and a preparation method thereof. Background technique [0002] The function of bridge deck pavement is to protect the roadway slab of the integral part of the main girder from the direct wear of vehicle tires or crawlers, prevent the main girder from being eroded by rainwater, and play a certain role in distributing the concentrated load of vehicle wheel weight. The primary goal of pavement design is to control crack propagation and minimize cracking due to shrinkage, temperature and fatigue stresses. Therefore, the bridge deck pavement requires a certain strength, and can meet various requirements such as crack resistance, impact resistance, and wear resistance. Considering that the corners of each plate at the joint are prone to crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06
CPCC04B14/06C04B28/02
Inventor 汤立群黄少新刘逸平李朝文黄小清苏镇洪刘泽佳
Owner SOUTH CHINA UNIV OF TECH
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