Spiral basalt micro-rib and preparation method thereof

Abstract

The invention provides a spiral basalt micro-rib and a preparation method thereof, and belongs to the field of novel composite materials. The micro-rib comprises basalt monofilament fibers and an alkali-resistant impregnating compound. After 500-1500 parallel basalt monofilament fibers are bundled and bonded through the alkali-resistant impregnating compound, extrusion forming, spiral twisting, secondary impregnating, drying hardening and cutting are sequentially conducted to obtain the spiral basalt micro-rib. The manufacturing process of the micro-rib is simple, the section rigidity is high, the micro-rib is not prone to caking and brittle failure after being mixed into concrete, and the upper limit of the mixing amount of the micro-rib in fresh concrete can be remarkably improved. The spiral structure of the micro-rib can improve the bonding performance between the micro-rib and concrete, and can bridge cracks and limit crack propagation more effectively, so that the mechanical property and durability of the concrete are remarkably improved. In addition, the micro-rib has good alkali resistance and chlorine salt corrosion resistance, and can improve the durability of concrete.

Description

technical field [0001] The invention relates to a spiral basalt micro-reinforcement and a preparation method thereof, belonging to the field of novel composite materials. Background technique [0002] Basalt fiber has the advantages of high tensile strength (>3000MPa), good corrosion resistance, and good thermal stability. Compared with glass fiber, basalt fiber is more green and environmentally friendly; the total energy consumption (13MJ) required to produce per kilogram of basalt fiber is 46% lower than that of glass fiber (24MJ), and the alkali resistance of basalt fiber is higher. Glass fiber (14.5wt% ZrO 2 ) is quite, more suitable for the strong alkaline environment (pH>12.5) of the concrete matrix. Compared with steel fiber, basalt fiber has better resistance to chloride ion erosion. When used as a reinforcing material in concrete, it can avoid the corrosion problem similar to steel fiber and ensure that basalt fiber has good corrosion resistance in concrete ...

AI Technical Summary

Problems solved by technology

The area enclosed by the bond-slip curve of the straight micro-reinforcement is smaller ( figure 2 ), the sliding energy dissipation capacity of micro-reinforcement is weak, and the toughening effect on concrete is poor

[0007] 3) The manufacturing process of ribbed micro-reinforcement is more complicated; in addition, the transverse rib may peel off from the core column of chopped fiber bundles during the stress process, resulting in a decrease in the toughening effect of ribbed micro-reinforcement on concrete

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