Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete

A technology of steel fiber reinforced concrete and reinforced concrete, which is applied in the direction of manufacturing tools, ceramic molding machines, etc., can solve the problems of low effective utilization efficiency of steel fibers and increased raw material costs, and achieves increased raw material costs, improved flexural strength, and tensile strength. improved effect

Active Publication Date: 2010-12-15
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, the distribution density of effective steel fibers must reach a certain value to truly resist cracking. For this problem, the method of increasing the overall content of steel fibers is generally used in engineering, so that even if the steel fibers are randomly distributed, the steel fibers along the direction of tensile stress are still There is enough quantity to bear the corresponding load, and the performance of concrete can be improved. The disadvantage of this is that the effective utilization efficiency of steel fibers in concrete is very low, and a large part of steel fibers cannot play their due role, which also leads to the preparation The cost of raw materials for steel fiber reinforced concrete has increased significantly

Method used

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  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete
  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete
  • Method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0044] The first step is to prepare the steel fiber concrete mixture

[0045] According to the known design method, the mass ratio of the concrete components whose strength grade is C40 is water: cement: fly ash: sand: stone: high-efficiency water reducer: steel fiber = 180: 375: 75: 780: 990:2.2:47 Weigh the required amount of water, cement, fly ash, sand, stone, high-efficiency water reducer and steel fiber. The steel fiber used is made of low carbon steel by cutting technology, with a diameter of 0.5mm and a length of The diameter ratio is 40. Put the weighed cement, fly ash, sand and stone into the dry material of the mixer and mix evenly, then put in all the weighed steel fibers while stirring until evenly mixed, then add the weighed mixing water and high-efficiency water reducing agent, continue to stir for 90 seconds, and the slump of the concrete mixture is 160mm;

[0046] The second step, pouring into the test mold

[0047] Pour the steel fiber concrete mixture pre...

Embodiment 2

[0057] The first step is to prepare the steel fiber concrete mixture

[0058] According to the known design method, the mass ratio of the concrete components whose strength grade is C55 is water: cement: fly ash: sand: stone: superplasticizer: steel fiber=170:385:95:775: 980:3.0:117 Weigh the required amount of water, cement, fly ash, sand, stone, high-efficiency water reducer and steel fiber, the steel fiber used is made of low carbon steel material by cutting technology, with a diameter of 0.5mm and a length of The diameter ratio is 40. Put the weighed cement, fly ash, sand and stone into the dry material of the mixer and mix evenly, then put in all the weighed steel fibers while stirring until evenly mixed, then add the weighed mixing water and high-efficiency water reducing agent, continue stirring for 300 seconds, and the slump of the concrete mixture is 40mm;

[0059] The second step, pouring into the test mold

[0060] Pour the steel fiber concrete mixture prepared i...

Embodiment 3

[0070] The first step is to prepare the steel fiber concrete mixture

[0071] According to the known design method, the mass ratio of the concrete components whose strength grade is C45 is water: cement: fly ash: sand: stone: superplasticizer: steel fiber=165:430:0:815: 970:3.2:59 Weigh the required amount of water, cement, fly ash, sand, stone, high-efficiency water reducer and steel fiber, the steel fiber used is made of low carbon steel material by cutting technology, with a diameter of 0.5mm and a length of The diameter ratio is 40. Put the weighed cement, fly ash, sand and stone into the dry material of the mixer and mix evenly, then put in all the weighed steel fibers while stirring until evenly mixed, then add the weighed mixing water and high-efficiency water reducing agent, continue to stir for 180 seconds, and the slump of the concrete mixture is 135mm;

[0072] The second step, pouring into the test mold

[0073] Pour the steel fiber concrete mixture prepared in ...

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Abstract

The invention discloses a method and special equipment for preparing unidirectionally-distributed steel fiber reinforced concrete and relates to fiber reinforced concrete. The method comprises the following key steps of: pouring a prepared steel fiber concrete mixture into a nonmetallic test mold and putting the test mold into a cavity in a framework of a coil of the special equipment for preparing the unidirectionally-distributed steel fiber reinforced concrete; putting the coil and the test mold on a vibrating table of the special equipment; switching on a direct current power supply of the special equipment to electrify the coil so as to form a magnetic field; applying the magnetic field to the prepared steel fiber concrete mixture so as to orient steel fiber; and keeping the direction of the magnetic field accordant with that of pulling stress during test piece testing or in a working state, wherein the special equipment consists of the vibrating table, the coil and the direct current power supply. Compared with steel fiber reinforced concrete prepared by the conventional method, the unidirectionally-distributed steel fiber reinforced concrete prepared by the method and the special equipment of the invention has breaking strength increased by 25 to 100 percent or saves the steel fiber by 25 to 60 percent.

Description

technical field [0001] The technical proposal of the present invention relates to fiber reinforced concrete, specifically a method for preparing unidirectional distribution steel fiber reinforced concrete and special equipment thereof. Background technique [0002] Concrete is a widely used structural material in civil engineering, transportation, water conservancy, nuclear power and many other projects. Concrete is characterized by high compressive strength, low tensile strength and small ultimate strain, and is a brittle material. Due to these characteristics, the concrete has poor toughness and is easy to crack. The concrete in the tensile stress area of ​​ordinary structural concrete in engineering is generally worked with cracks. The steel bars at the cracks cannot be effectively protected by concrete, and may corrode prematurely, which has a great impact on the durability of the structure. Adding steel fibers is one of the most effective ways to improve the crack res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/087B28B1/52B28B11/24C04B28/00C04B14/48
Inventor 慕儒赵全明田稳苓
Owner HEBEI UNIV OF TECH
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