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Flat plate magnetic field orienting device and method for preparing unidirectionally oriented steel fiber reinforced concrete

A technology of steel fiber reinforced concrete and magnetic field orientation, which is applied to clay preparation devices, cement mixing devices, chemical instruments and methods, etc. There is no problem of lifting, etc., to achieve the effect of improved bending toughness, improved flexural strength, and convenient movement.

Pending Publication Date: 2020-06-02
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reinforcement effect of steel fibers different from the direction of tensile stress is small, so the reinforcement effect of steel fiber reinforced concrete materials along the direction of stress is weakened.
For the random distribution of steel fibers in floor engineering such as road surfaces and bridge decks, the vertically arranged steel fibers are parallel to the crack surface, which cannot fully play the role of bridging cracks, thus affecting the crack resistance and flexural strength of the material. Lifting effect, reducing the reinforcing effect of steel fibers on the material

Method used

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  • Flat plate magnetic field orienting device and method for preparing unidirectionally oriented steel fiber reinforced concrete
  • Flat plate magnetic field orienting device and method for preparing unidirectionally oriented steel fiber reinforced concrete
  • Flat plate magnetic field orienting device and method for preparing unidirectionally oriented steel fiber reinforced concrete

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specific Embodiment 1

[0041] The flat magnetic field orientation device 1 has a size of 300mm×100mm×25mm, and is composed of four larger bar magnets 21 aligned with the same poles and arranged side by side. The bar magnet is a commercially available alnico bar magnet with a length of 300 mm, a section width of 25 mm, and a height of 25 mm, and the surface magnetic induction is 0.1T.

[0042] S1, the strength grade determined according to the known design method is C30. The mass mix ratio of the components is water: cement: sand: stone: water reducer: steel fiber = 180: 380: 835: 975: 3.6: 47, which is called Take the required amount of water, cement, sand, stone, high-efficiency water reducer, and steel fiber. The steel fiber used is low-carbon steel material, steel wire cut-off hook type, with a diameter of 0.5mm and a length of 30mm. Put the weighed water, cement, sand and stone into the mixer and mix thoroughly for 120s, sprinkle steel fibers evenly and add the weighed mixing water and high-effi...

specific Embodiment 2

[0048] The flat magnetic field orientation device 1 has a size of 300mm×100mm×25mm, and is composed of four larger bar magnets 21 aligned with the same poles and arranged side by side. The bar magnet is a commercially available alnico bar magnet with a length of 300 mm, a section width of 25 mm, and a height of 25 mm, and the surface magnetic induction is 0.1T.

[0049] S1, the strength grade determined according to the known design method is C35. The mass mix ratio of the components is water: cement: sand: stone: water reducer: steel fiber = 180: 400: 860: 930: 4: 62, which is called Take the required amount of water, cement, sand, stone, high-efficiency water reducer, and steel fiber. The steel fiber used is a low-carbon steel wire with a cut end hook type, a diameter of 0.5mm, and a length of 30mm. Put the weighed water, cement, sand and stone into the mixer and mix thoroughly for 120s, sprinkle steel fibers evenly and add the weighed mixing water and high-efficiency water ...

specific Embodiment 3

[0055] The flat magnetic field orientation device 1 has a size of 300mm×100mm×25mm, and is composed of four larger bar magnets 21 aligned with the same poles and arranged side by side. The bar magnet is a commercially available alnico bar magnet with a length of 300 mm, a section width of 25 mm, and a height of 25 mm, and the surface magnetic induction is 0.1T.

[0056] S1, the strength grade determined according to the known design method is C35. The mass mix ratio of the components is water: cement: sand: stone: water reducing agent: steel fiber = 180: 400: 900: 900: 4.2: 78, which is called Take the required amount of water, cement, sand, stone, high-efficiency water reducer, and steel fiber. The steel fiber used is low-carbon steel material, steel wire cut-off hook type, with a diameter of 0.5mm and a length of 30mm. Put the weighed water, cement, sand and stone into the mixer and mix thoroughly for 120s, sprinkle steel fibers evenly and add the weighed mixing water and hi...

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Abstract

The invention provides a flat plate magnetic field orienting device and method for preparing unidirectionally oriented steel fiber reinforced concrete. The device comprises a flat plate which is formed by multiple bar magnets through homopolar alignment and parallel fixed combination. According to the method for preparing unidirectionally oriented steel fiber reinforced concrete by the flat platemagnetic field orienting device, when the steel fiber reinforced concrete is prepared and poured into a designated area with a known method in the field and subjected to vibration, the flat plate magnetic field orienting device is placed in any surface of a steel fiber reinforced concrete mixture which is liquefied under vibration, the magnetic field produced by the device can magnetize steel fibers which are randomly disoriented in the concrete mixture and drive the steel fibers to rotate to the same direction, and after the steel fiber reinforced concrete is hardened, the unidirectionally oriented steel fiber reinforced concrete is prepared. The method has the advantage that the method can be applied to direction control of the steel fibers in structural concrete such as floors, pavements and slabs in practical engineering sites.

Description

technical field [0001] The invention relates to a method for preparing unidirectionally oriented steel fiber concrete, in particular to a flat plate magnetic field orientation device for preparing unidirectionally oriented steel fiber concrete and a method for preparing unidirectionally oriented steel fiber concrete through the flat magnetic field oriented device. The magnetic field orients the steel fibers. Background technique [0002] Steel fibers can hinder the expansion of micro-cracks and the formation of macro-cracks in concrete, thereby effectively improving the tensile properties of concrete. At the same time, the incorporation of steel fibers also improves the toughness and impact resistance of concrete materials, and its crack resistance to cracks greatly improves the durability of concrete materials and prolongs their service life. Since the development of steel fiber concrete, it has played an important role in floors, highway pavements, and bridge decks. In r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28C5/40
CPCB28C5/40B28C5/402
Inventor 慕儒刘昊奇卿龙邦赵全明王晓伟
Owner HEBEI UNIV OF TECH
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