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

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...

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.

Images