Horizontal rib enhanced basalt chopped fiber bundle core column micro rib and preparation method

Abstract

The invention discloses a horizontal rib enhanced basalt chopped fiber bundle core column micro rib and a preparation method and belongs to the field of novel composite materials. The micro rib is prepared from chopped monofilament fibers, a chopped fiber bundle core column, a bonding and impregnating agent, continuous fibers and a horizontal rib, wherein the chopped monofilament fibers and the continuous fibers are both basalt fibers, the chopped fiber bundle core column is formed by 500 to 1500 parallel monofilament fibers which are bundled and bonded by the bonding and impregnating agent, hardened and cut, and the horizontal rib is formed by the continuous basalt fibers which are horizontally and perpendicularly wound to the fiber bundle core column. The micro rib has high elastic modulus and high tensile strength, especially has higher sectional rigidity; the micro rib further can improve the agglomeration phenomenon in a concrete stirring process, so that the micro ribs can be more evenly distributed in a matrix; meanwhile, the horizontal rib on the surface of the micro rib can improve bonding strength and toughness between the micro rib and the concrete matrix; in addition, the micro rib has good corrosion resistance and can improve durability of concrete.

Description

technical field [0001] The invention relates to a micro-reinforcement and a preparation method of a transverse rib-reinforced basalt chopped fiber bundle core column, belonging to the field of new composite materials. Background technique [0002] Basalt fibers have different advantages than steel fibers when it comes to resisting cracks in concrete. [0003] Steel fiber has high tensile strength and elastic modulus (strength 1000N / mm 2 left and right, the elastic modulus is about 210GPa); in addition, there is a good bonding performance between the wavy or end hook-shaped steel fiber and the concrete interface ( figure 1 ); but the steel fiber has the problem of corrosion, because the concrete structure usually works with cracks in the normal use stage, the appearance of cracks aggravates the durability of the concrete structure caused by the steel fiber corrosion, especially in coastal high temperature, high humidity, high salt The joint effect of the environment will si...

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Problems solved by technology

[0006] 2) The bonding performance between the basalt bundled fibers and the matrix is ​​mainly provided by the friction / shear stress τ on the fiber surface ( Figure 4 ); compared with the basalt bundled fibers, the bonding performance between the steel fiber at the end hook and the concrete matrix mainly depends on the oblique extrusion force γ( Figure 5 ), the bearing capacity continues to rise after debonding; we have also imitated steel fibers and bent the ends of basalt bundled fibers, but due to its low elastic modulus and stiffness, it will be pulled quickly during the stress process straight

[0007] 3) And when used as basalt bundled fibers, the bonding and sizing agent mainly gathers on the outer layer of the fiber bundle, and there is a problem of uneven penetration into the inner fibers and a small penetration depth ( Figure 6a ), which in turn leads to inhomogeneous distribution of tensile stress in the normal cross-section when the fiber is stretched ( Figure 7 shown by the dotted line)

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