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Arc-shaped steel fiber, manufacturing mold and method and concrete applying steel fiber

A fiber-reinforced concrete and arc-shaped technology, which is applied in the field of manufacturing molds and methods and concrete and arc-shaped steel fibers using the steel fiber, can solve the problems of limited crack control effect, small improvement of control effect, and restriction of SIFCON performance, etc., to achieve Good bonding effect and enhanced bridging efficiency

Active Publication Date: 2021-11-12
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing different steel fiber types only adjust their geometric parameters on the original basis, and still belong to the "one-dimensional" size fiber, which does not improve the size of the fiber in all directions. The potential "interlocking" effect depends too much on the geometry of the fiber ends and the positional relationship between fibers, and it is difficult to achieve a good crack control effect in all directions, which restricts the further improvement of SIFCON's performance to a certain extent
[0003] Chinese patent CN201120344944.2 discloses an end-hook steel fiber, which rolls the steel fiber into a bow-shaped main structure, and then bends two ends to set the anchoring section, but the size of the main part is still too large In other directions, it belongs to "one-dimensional" size fibers, and it is difficult to use the bridging between two fibers to form a closed space in the matrix to inhibit the development of cracks, and the control effect on crack development is limited
[0004] Chinese patent CN200920236174.2 discloses a wavy micro-steel fiber, which rolls the steel fiber into a wavy shape, with peaks and troughs, and the size of a single direction is much larger than that of other directions, which also belongs to "one-dimensional" size fibers. It only has a good crack bridging effect in one direction, but cannot play a good bridging effect in the other direction.

Method used

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  • Arc-shaped steel fiber, manufacturing mold and method and concrete applying steel fiber
  • Arc-shaped steel fiber, manufacturing mold and method and concrete applying steel fiber
  • Arc-shaped steel fiber, manufacturing mold and method and concrete applying steel fiber

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preparation example Construction

[0041] Based on the above-mentioned infiltrated fiber concrete, the present invention also proposes a preparation method of infiltrated fiber concrete, comprising the following steps,

[0042] 1) Cover the entire mold with arc-shaped steel fibers, so that a plurality of arc-shaped steel fibers are connected;

[0043] 2) Inject cement slurry (or mortar) into the mold to form infiltrated fiber concrete. Because its main body is in the shape of an arc, the fibers in the matrix are connected with each other, please refer to image 3 , and the "occlusal force" generated by mutual hooking is theoretically much greater than the mechanical interlocking force produced by the end "interlocking" effect between the traditional end-hook steel fibers, making it more difficult for the present invention to be pulled out from SIFCON, and the fibers The interconnection between them helps the load to transmit farther, allowing the larger volume of SIFCON to participate in the force

[0044] In a...

Embodiment 1

[0055] Use a steel wire with a nominal tensile strength of 1100MPa, a diameter of 0.55mm, and a length of 44.00mm, which is prepared according to the above steps, and the anchorage section is set, wherein the radius R of the arc section 1 1 is 10.00mm, the radius R of the small arc segment 2 2 is 4.50mm, the length L of the straight line segment 3 2 is 2.48mm, the radian θ from the center of the circle to the two ends of the fiber is 5π / 4, and the straight-line distance L between the two ends of the fiber 1 It is 25.53mm, and the aspect ratio of steel fiber is 80.

Embodiment 2

[0057] Use a steel wire with a nominal tensile strength of 600MPa, a diameter of 0.50mm and a length of 31.00mm, prepare it according to the above steps, and set the anchoring section, where the radius R of the arc section 1 1 is 7.00mm, the radius R of the small arc segment 2 2 is 2.55mm, the length L of the straight line segment 3 2 is 2.15mm, the radian θ from the center of the circle to the two ends of the fiber is 4π / 3, and the straight-line distance L between the two ends of the fiber 1 It is 15.21mm, and the aspect ratio of steel fiber is 62.

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Abstract

The invention provides an arc-shaped steel fiber which is characterized in that a main body of the arc-shaped steel fiber is an arc, anchoring sections can be arranged at the two ends of the fiber in order to improve anchoring of the fiber in a base body, each anchoring section can be composed of one or more continuously-arranged end hooks, and each end hook is composed of an arc section and a linear section. Aiming at overcoming that a one-dimensional size fiber in a base body has defects in a bridging mechanism and the crack inhibition capability, the arc-shaped steel fiber with the two-dimensional size characteristic is prepared,the arc-shaped steel fibers are paved on the whole mold in advance, through the mutual hooking effect of the arc-shaped steel fibers, the two-time bridging effect of the arc-shaped steel fibers on base body cracks and the advantage effect that two fibers can form a closed space in a base body to restrain crack propagation, the inhibition efficiency of crack propagation is improved, and the basic mechanical property of the seepage pouring fiber concrete is greatly improved.

Description

technical field [0001] The invention relates to the technology of infiltrated fiber concrete, in particular to an arc-shaped steel fiber, a manufacturing mold and method, and concrete using the steel fiber. Background technique [0002] The preparation process of infiltrated fiber concrete (Slurry infiltrated fiber concrete, referred to as SIFCON) is different from that of traditional concrete. It needs to be pre-filled with steel fibers in the mold, and the resulting fiber network is infiltrated by the stirred cement paste (or mortar) Prepared, the fiber volume ratio can reach 5% to 20%, and it has obvious strain hardening performance under tension and compression after hardening. It is a promising high-strength and high-toughness material. and other fields are widely used. The shape of the steel fiber used by SIFCON has a significant impact on its mechanical properties. Traditional steel fibers usually have hook-end, straight and wavy fibers. The size of these fibers in o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/48C04B28/00B21F1/02B21F23/00B21F11/00B21F1/00
CPCC04B14/48C04B28/00B21F1/026B21F23/00B21F11/00B21F1/00C04B14/06C04B18/08C04B18/146C04B2103/302Y02W30/91
Inventor 潘云锋李贺东李亚彪王敏嘉
Owner ZHEJIANG SCI-TECH UNIV
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