RU170083U1 - Composite reinforcing bar based on basalt multifilament yarn - Google Patents

Abstract

The utility model relates to the field of construction. The technical result is ensured by the fact that the composite reinforcing bar based on a basalt complex thread, profiled along the entire length of the bar, is made in the form of a thin plate of epoxy binder, in the center of which there is a bearing element in the form of a basalt complex thread impregnated and coated with an epoxy binder, and the edges of the epoxy binder plate are given longitudinal corrugation in the plane of the plate along the entire length of the rod in the form of triangular ubtsov, and has a space from the base to the tooth surface basalt multifilament yarn. 2 ill.

Description

The utility model relates to the field of construction.

Composite rod is known from the prior art (RU 2430220, IPC E04C5 / 07. Date of publication: 09/27/2011).

Composite rod of high-strength polymer for reinforcing binding media, including fibers combined into bundles, formed by torsion of bundles, the diameter of bundles being 25-47% of the diameter of the rod, and the number of bundles should be at least 3, and the number of torsions of bundles per meter The rod is in the range of 5-120.

The disadvantage of the proposed device is the insufficient mechanical engagement of the ledges on the surface of the reinforcement in the cement matrix, the smoothness of the formed ledges.

Known patent RU 2509653 "Composite fittings", IPC B32B17 / 04 , C08J5 / 04 , C08L63 / 00 , E04C5 / 07 (Date of publication: 20.03.2014).

The composite reinforcement contains a rod with a winding made of a fibrous filler impregnated with a polymeric binder based on epoxy resin and hardener. The reinforcement contains, wt.%: Fiber filler 60-80% and a binder 20-40%, where the binder includes, wt.%: Epoxy-novolac resin 50-60, amine hardener 40-50. Epoxy novolac resin contains, wt.%: Diane epoxy resin 47-80%, a modifier based on polyethers containing glycidyl groups, 10-25%, a product obtained by epoxidizing an oligomer of hydroxyphenylene from alkylresorcinol, 10-28%.

In this technical solution, each strand of reinforcement is impregnated with a cured polymer resin, and in the process of manufacturing the reinforcement, voids are formed between the strands, which are also filled with resin. The voids filled with the cured resin significantly reduce the bearing capacity of the reinforcement and give it brittleness due to the greater brittleness of the cured resin compared to fibers.

The closest is the technical solution according to patent RU 2431026, IPC E04C5 / 07, publication date: 10/10/2011, "Composite reinforcing element".

The composite reinforcing element for dispersed concrete reinforcement from a section of mineral fiber roving according to the first embodiment is made of one twisted roving impregnated with a polymer binder. The composite reinforcing element for dispersed concrete reinforcement from a section of mineral fiber roving according to the second embodiment is made of two rovings twisted together and impregnated with a polymer binder. The composite reinforcing element according to the first and second options can be made in the range of diameters of 0.1-2.0 mm, length not less than the diameter and can be profiled along the entire length or part of the length, can also be impregnated with a polymer binder in the surface layer. The composite reinforcing element according to the second embodiment can be made of various mineral fibers.

The disadvantages of the proposed options are the insufficient efficiency of the joint work of the proposed reinforcement with concrete, the difficulty in manufacturing reinforcing elements when working with roving segments of small length and diameter, and low filling efficiency with the proposed elements of the cement matrix. The implementation of the impregnation with a polymer binder in the surface layer does not ensure the joint work of roving fibers in the reinforcing element. The proposed devices are designed for dispersed reinforcement, which eliminates their workability, does not allow to control the nature of the reinforcement. In addition, dispersed reinforcement is ineffective for stretched and flexible structural elements. For stretched and bent elements, directional reinforcement is most effective. When adding the proposed devices to the matrix, it is difficult to achieve its effective filling, which makes unpredictable the behavior of structures experiencing tension in bending.

The technical problem, the solution of which is the claimed utility model, is to increase the efficiency of joint work of reinforcement with concrete, which involves:

the formation of a workable reinforcing structure;

the exclusion of the point of contact of the surface of the reinforcement with the cement matrix;

ensuring the compatibility of the work of the fibers in the composition of the formed rod;

full inclusion in the work under load of fibers along the entire diameter of the rod;

formation of a self-anchoring surface at the reinforcing bar.

The technical result is ensured by the fact that a composite reinforcing bar based on a basalt complex filament, profiled along the entire length of the bar, is made in the form of a thin plate of epoxy binder, in the center of which there is a bearing element in the form of a basalt complex filament, impregnated and coated with an epoxy binder, and the edges epoxy binder plates give longitudinal corrugation in the plane of the plate along the entire length of the rod in the form of triangular teeth, and there is also an indent from the base of the tooth to the surface of a basalt complex thread.

The proposed construction is illustrated by the circuits shown in FIG. 12.

Figure 1 shows a composite reinforcing bar based on a basalt complex thread of the proposed design.

Figure 2 shows a cross section of a composite reinforcing bar based on a basalt complex thread of the proposed design.

The composite reinforcing bar based on a basalt complex thread is made in the form of a thin plate of epoxy binder 2, in the center of which there is a carrier element in the form of a basalt complex thread 1. The edges of the plate are processed to give them linear corrugation in the form of teeth 3 in the plane of the plate (Fig. 1 )

In the cross section, the reinforcement is formed by basalt fibers, combined into a complex thread 1 by twisting around the longitudinal axis and processing with a polymer binder. The fibers that make up the basalt complex thread are continuous along the entire length of the thread. The basalt multifilament yarn is continuous along the entire length of the composite reinforcing bar. The thread has a circular shape in cross section (Fig. 2).

To ensure the compatibility of the work of the fibers in the moldable reinforcing bar, the basalt multifilament yarn 1 is treated with an epoxy binder 2. The epoxy binder completely impregnates the basalt multifilament yarn, thereby combining the individual fibers that make up the yarn in the rod. This ensures a uniform distribution of stresses over the entire diameter of the rod and, therefore, more fully incorporates a basalt multifilament yarn under load. Due to the complete impregnation, the strength properties of the product are improved. An epoxy binder covers the basalt complex yarn on the upper and lower sides of the plate and thereby forms a protective layer on top and bottom of the basalt yarn. On the sides are excess epoxy binder, processed in such a way as to anchor the reinforcing bar in concrete. The excess epoxy binder is given the shape of teeth 3. The teeth are formed 3-5 mm high with an indent from the axis of the rod to the base of the tooth 3 mm. Indentations 4 from the basalt multifilament yarn to the base of the tooth are necessary to prevent cracks in the epoxy layer from appearing under load, exposing the surface of the basalt yarn and thereby creating weakened zones of the reinforcing material.

The cured epoxy binder fixes the position of the basalt multifilament yarn and shapes the reinforcing bar.

Distinctive features of the invention from the above prototype are the following:

basalt fibers are used as the load-bearing material in the reinforcing bar;

the bearing element of the reinforcing bar is made in the form of a basalt complex thread;

an epoxy adhesive binder is used as an impregnation;

complete impregnation of the basalt complex filament with an epoxy binder;

a transverse profile in the form of corrugations with teeth is created only in the plane of the plate along the entire length of the reinforcing element;

the length of the reinforcing element is chosen equal to the length of the reinforced structure;

Anchoring of the reinforcing element in the matrix is carried out by engaging the teeth of the epoxy binder, and not due to the shape of the rod.

Due to the presence of these features, a new design of a composite reinforcing bar based on a basalt complex thread has been created. The inventive utility model has high strength properties. The tensile strength of a composite reinforcing bar based on a basalt complex yarn is an average of 330 MPa, which puts the claimed utility model on a par with steel reinforcement in strength.

The inventive utility model has the convenience of laying in the matrix due to the fact that it is a rod, the position of which in the manufacture of the building element can be controlled.

The inventive utility model has the ability to self-anchor in the matrix due to the ledges formed in the plane of the plate in the form of teeth.

During hardening of the cement stone, an aggressive environment forms, in the contact zone “fiber-cement matrix” neoplasms appear as a result of the interaction of calcium hydroxide of Portland cement with silicon oxide of the fiber, dissolution of the surface layer and thinning of the fibers are observed. Processing and coating of the basalt complex filament with an epoxy binder provides additional protection for thin basalt fibers constituting the basalt complex filament from exposure to the alkaline environment of concrete, reduces the likelihood of a coagulation layer on the surface of the fibers, the effect of which on the adhesion of basalt fibers to the cement matrix is negative.

Claims (1)

A composite reinforcing bar based on a basalt complex filament, profiled along the entire length of the bar, characterized in that it is made in the form of a thin plate of epoxy binder, in the center of which is a carrier element in the form of a basalt complex filament, impregnated and coated with an epoxy binder, and the edges of the plate are made of epoxy binder gives longitudinal corrugation in the plane of the plate along the entire length of the rod in the form of triangular teeth, and there is also an indent from the base of the tooth to the basalt surface multifilament yarn.

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