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Anti-explosion and anti-shock multi-stage heterogeneous fiber precast composite concrete and its preparation method

A prefabricated body and concrete technology, applied in the direction of chemical instruments and methods, manufacturing tools, hydraulic material layered products, etc., can solve the problems of inability to achieve concrete impact resistance, negative Poisson's ratio effect is not obvious, and fiber cannot be applied Concrete and other problems to achieve the effect of improving three-dimensional random distribution, reducing secondary damage, and improving compression resistance

Active Publication Date: 2020-11-24
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the negative Poisson's ratio effect of the double-helix fiber structure involved in this application is relatively limited, and the negative Poisson's ratio effect only exists in the double-helix fiber structure itself, and the chopped double-helix fiber is mixed in concrete, and the concrete The overall negative Poisson's ratio effect is not obvious, and the impact resistance and blast resistance of concrete cannot be greatly improved
In addition, the application has a narrow range of fiber types and cannot be applied to all types of fiber concrete, and the bonding performance of the fibers with the concrete matrix after treatment with unmodified epoxy resin is not ideal, and it is easy to peel off from the concrete matrix under load , reducing the comprehensive performance of concrete

Method used

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  • Anti-explosion and anti-shock multi-stage heterogeneous fiber precast composite concrete and its preparation method
  • Anti-explosion and anti-shock multi-stage heterogeneous fiber precast composite concrete and its preparation method
  • Anti-explosion and anti-shock multi-stage heterogeneous fiber precast composite concrete and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The secondary heterogeneous fiber prefabricated body with negative Poisson's ratio effect is formed by weaving several secondary heterogeneous fibers in warp and weft. The secondary heterogeneous fiber is formed by winding multi-level auxiliary fibers on the core fiber; the core fiber is a low modulus fiber, and the secondary auxiliary fiber is a high modulus fiber with different elastic modulus. The distance between the core fibers of adjacent secondary heterogeneous fibers is 20mm. Described low modulus fiber is polyvinyl alcohol fiber; Polyvinyl alcohol fiber: long fiber, diameter is the fiber bundle of 450 μm, elongation at break is 7%, modulus of elasticity is 43GPa, and density is 1.30g / cm 3 , has good acid and alkali resistance.

[0029] The primary auxiliary fiber is an aramid fiber with an elastic modulus of 50 GPa, a diameter of 150 μm, and a helix angle of 6°; the second-level auxiliary fiber is an aluminum silicate fiber with an elastic modulus of 480 GPa a...

Embodiment 2

[0037] Embodiment 2: Different from Embodiment 1,

[0038] For the three-level heterogeneous fiber preform with negative Poisson's ratio effect, the distance between the core fibers of adjacent three-level heterogeneous fibers is 50 mm. Described low modulus fiber is polyethylene fiber; Polyethylene fiber: bundle monofilament, diameter is the fiber bundle of 380 μm, elastic modulus is 4000MPa, elongation at break is 15%, and density is 0.91g / cm 3 .

[0039] The first-level auxiliary fiber is aramid fiber with an elastic modulus of 85GPa, a diameter of 243 μm, and a helix angle of 7°; the second-level auxiliary fiber is an ultra-high molecular weight polyethylene fiber with an elastic modulus of 130GPa and a diameter of 151 μm, and the helix angle is 15°; the third-level auxiliary fibers are steel fibers and carbon fibers, wherein the elastic modulus of the steel fibers is 210 GPa, the elastic modulus of the carbon fibers is 200 GPa, and the diameters of the steel fibers and t...

Embodiment 3

[0047] Embodiment 3: Different from Embodiment 1,

[0048] For the four-level heterogeneous fiber preform with negative Poisson's ratio effect, the distance between the core fibers of adjacent four-level heterogeneous fibers is 80 mm. Described low modulus fiber is polypropylene fiber; Polypropylene fiber: bundle-shaped monofilament long fiber, diameter is the fiber bundle of 410 μm, and density is 0.91g / cm 3 , elastic modulus of 3500MPa, elongation at break of 17%, flexible chain fiber, strong acid and alkali resistance.

[0049] The primary secondary fiber is a polyarylate fiber with a modulus of elasticity of 50Gpa, a diameter of 270 μm, and a helix angle of 5°; the secondary secondary fiber is a polybenzobisoxazole fiber with a modulus of elasticity of 56Gpa. The diameter is 220 μm, the helix angle is 12°; the third-level auxiliary fiber is ultra-high molecular weight polyethylene fiber, the elastic modulus is 65Gpa, the diameter is 143 μm, and the helix angle is 18°; the...

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Abstract

The invention provides an anti-explosion and anti-shock multi-stage heterogeneous fiber prefabricated body composite concrete and a preparation method thereof. Multi-level heterogeneous fiber prefabricated bodies arranged in parallel in multiple layers are arranged in the anti-explosion and impact-resistant concrete. The multi-level heterogeneous fiber preform is formed by weaving several multi-level heterogeneous fibers in warp and weft. The multi-level heterogeneous fiber is formed by winding multi-level auxiliary fibers on the core fiber; the core fiber is a low-modulus fiber, and the multi-level auxiliary fibers are high-modulus fibers with different elastic moduli. The anti-explosion and impact-resistant concrete, through the gradient spiral design and three-dimensional layered arrangement of multi-level auxiliary fibers in the prefabricated body, significantly improves the negative Poisson's ratio effect of the prefabricated body and effectively exerts it in the matrix. Compared with the existing concrete, the strength, toughness, energy dissipation modulus and storage energy modulus of the anti-explosion and anti-shock multi-stage heterogeneous fiber prefabricated composite concrete are greatly improved, and can effectively prevent material damage from causing fragments to splash , to reduce secondary damage to personnel and building structures.

Description

technical field [0001] The invention belongs to the field of construction, and relates to an explosion-resistant and impact-resistant fiber concrete and a preparation method thereof, in particular to an explosion-resistant and impact-resistant multi-stage heterogeneous fiber prefabricated composite concrete and a preparation method thereof. Background technique [0002] In recent years, frequent explosion accidents at home and abroad have caused serious threats to buildings and human life and property. This is due to the fact that the explosion accident occurred in a short period of time, suffered a very large impact load, and the change time was very fast, so it was difficult to take effective countermeasures to reduce the injury. Generally speaking, high-strength concrete has a large elastic modulus, high brittleness, and low ductility. When it explodes, it will produce large and numerous fragments, causing certain damage. Incorporating fibers into concrete can increase t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B13/14C04B20/00C04B16/06C04B14/46C04B14/48C04B14/38D03D15/242D03D15/267D03D15/275D03D15/283D03D15/47D03D15/50
CPCC04B20/0052D03D15/00D02G3/04D02G3/36C04B16/0641C04B16/0691C04B14/4656C04B16/0625C04B14/386C04B14/48C04B16/0683C04B16/0675C04B16/0633C04B14/4625E04C5/07B28B3/022B28B23/04
Inventor 马衍轩徐亚茜李梦瑶于霞朱鹏飞宋晓辉段玉莹马巧玲
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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