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Fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect and its preparation

A porous concrete, fiber-reinforced technology, applied in the field of construction, to avoid secondary damage, improve storage modulus, and improve absorption capacity.

Active Publication Date: 2018-12-11
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the explosion-proof aspect of existing concrete, the present invention provides fiber-reinforced porous explosion-proof concrete and a preparation method thereof

Method used

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  • Fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect and its preparation
  • Fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect and its preparation
  • Fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect and its preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1: Fiber-reinforced porous explosion-proof concrete with interconnected hole structure and hexagonal concave fiber structure unit directional ordered dense array reinforcement

[0044] A fiber-reinforced porous explosion-proof concrete with a negative Poisson's ratio effect, the fiber-reinforced porous explosion-proof concrete is composed of a porous concrete matrix with a connected pore structure and a number of special fiber structural units; the fiber structural units are arranged in parallel Composed of two layers of fiber hinges, the fiber hinge is a hexagonal concave structure; the concave angle is β 1 =90°, the layer spacing is 15mm, the diameter of the circumscribed circle of the hexagonal axisymmetric polygon is 24mm, and the fiber is a fiber bundle with a diameter of 5mm spun from a steel fiber with a diameter of 0.2mm. Each fiber structure unit also includes fixed fiber bundles in the vertical direction, and the plane of the fiber hinge of each layer ...

Embodiment 2

[0061] Example 2: Fiber-reinforced porous explosion-proof concrete with connected hole structure and hexagonal concave fiber structure unit directional and ordered compartment array reinforcement

[0062] The difference from Example 1 is that the fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect, the fiber structure unit is composed of three layers of fiber hinges arranged in parallel, and the concave angle is β 1 =120°, the layer spacing is 20mm, the diameter of the circumscribed circle of the hexagonal axisymmetric polygon is 20mm, and the fiber is a fiber bundle with a diameter of 4mm spun from a steel fiber with a diameter of 0.1mm. The multiple fiber structure units that make up the explosion-proof fiber concrete are oriented and ordered interlayer arrays (special concave / ordinary structure levels alternately and orderly arranged fiber concrete), such as Figure 6 as shown in b. The gelling material is Portland cement, and the foam stabi...

Embodiment 3

[0065] Example 3: Fiber-reinforced porous explosion-proof concrete with interconnected hole structure and hexagonal concave fiber structure unit oriented and orderly interlayer cross mosaic array reinforcement

[0066] Different from Example 1, the fiber-reinforced porous explosion-proof concrete with negative Poisson's ratio effect, the fiber structure unit is composed of 4 layers of fiber hinges arranged in parallel, and the concave angle is β 1 =150°, the layer spacing is 30mm, the diameter of the circumscribed circle of the hexagonal axisymmetric polygon is 50mm, and the fiber is a fiber bundle with a diameter of 6mm spun from a steel fiber with a diameter of 0.6mm. The plurality of fiber structural units that make up the explosion-proof fiber concrete are directional and ordered interlayer cross mosaic arrays (special concave / common structure ABA strip mosaic arrangement type fiber concrete), such as Figure 6 as shown in c. The gelling material is expansive cement and t...

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Abstract

The invention discloses fiber-reinforced porous explosion-proof concrete with a negative poisson's ratio effect. The fiber-reinforced porous explosion-proof concrete consists of a porous concrete base body which is of an intercommunicating pore structure or an inwards sunken hole structure, and a reinforcing body array consisting of a plurality of fiber structure units with special forms, wherein each fiber structure unit with the special form consists of 2 to 4 layers of fiber hinges distributed in parallel, and an interlayer spacing is 10 to 50 mm; the fiber hinges are of axisymmetric polygonal structures with inwards sunken corners; the diameter of an external circle of each axisymmetric polygon is 9 to 54 mm. By combination of the porous concrete base body with the negative poisson's ratio effect and the specially-formed fiber structure units with the negative poisson's ratio effect, the minimum poisson's ratio of the original porous concrete base body can be -0.53 and -0.98 respectively, and the energy storage modulus is increased by 320 percent and 418 percent; the absorption capacity of an explosive load is improved more substantially, and the original structure cannot be damaged to an extremely large extent.

Description

technical field [0001] The invention belongs to the field of construction, and relates to a fiber-reinforced porous concrete and a preparation method thereof, in particular to a fiber-reinforced porous explosion-proof concrete with a negative Poisson's ratio effect and a preparation method thereof. Background technique [0002] In recent years, domestic and international explosions have emerged one after another. The most direct measure against personal and property damage caused by explosive loads is to design effective explosion-proof materials for infrastructure. However, the design concept of traditional concrete is mainly to improve its own strength, which cannot play a positive role in the dredging of the explosion process and the elimination of energy transfer. From the perspective of mechanics, the basic problem of explosion is energy rather than force. Therefore, when the load strength exceeds the strength critical value, traditional concrete realizes energy relea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B28/04C04B28/14C04B28/34C04B28/06C04B38/02
CPCC04B28/00C04B28/04C04B28/06C04B28/14C04B28/34C04B2111/40C04B2201/50C04B38/02C04B24/383C04B22/08C04B2103/302C04B14/48C04B24/04
Inventor 马衍轩张颖锐杨蒙蒙管泽鑫李子哲黄胜扬汪鹤健
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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