RU2451647C1 - Method of aligning metallic dispersion-reinforcement elements in concrete - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: method relates to portland cement-based concrete with metal reinforcement, and specifically in form of dispersion-reinforcement elements. The method of aligning metallic dispersion-reinforcement elements in concrete involves preparing concrete, adding metallic dispersion-reinforcement elements and pouring the concrete mixture into a vibration mould. An aggregate with fineness modulus 1, 1.5, 2 is added to the concrete. Dispersion-reinforcement elements with diameter 1-2 mm and length 30-60 mm is added while mixing constantly. The obtained mixture is then poured into a vibration mould and simultaneously exposed to vibration and an electromagnetic field with induction 0.12-0.36 T.

EFFECT: improved operational properties, low material consumption, automation of production lines for producing concrete articles, providing dispersion-reinforcement elements contained in a concrete mixture, needed for spatial orientation which meets operating conditions of the structure.

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Description

The method relates to concrete based on Portland cement, with metal reinforcement, namely in the form of dispersed reinforcing elements.

A known method of pre-mixing steel-fiber concrete mixture followed by compaction methods of vibration, roller molding, centrifugation (BCH 56-97 "Design and the main provisions of the technology of production of concrete structures", 1997, developed by NIIIZhB, MNIITEP and the company "Fiber concrete"), including the preparation of concrete mixtures, preparation of fiber reinforcement, subsequent mixing of fiber reinforcement with the mixture, molding of the mixture, compaction of the mixture, heat-moisture treatment, formwork of the finished product liya, warehousing.

The disadvantage of this method is that the fibers are randomly located in the concrete, which does not allow the full use of their properties.

The objective of the proposed method is to give the dispersed reinforcing elements contained in the concrete mixture, the necessary spatial orientation corresponding to the working conditions of the structure, to use its properties more efficiently.

The problem is solved by applying an electromagnetic field while vibrating the concrete mixture.

The essence of the invention lies in the fact that aggregate with a fineness modulus of 1, 1.5, 2 is added to concrete, with continuous mixing, dispersed reinforcing elements with a diameter of 1-2 mm, a length of 30-60 mm are uniformly fed into it, then the resulting mixture is loaded into a vibration formwork and simultaneously affect it with vibration and an electromagnetic field with induction 0.12-0.36 T.

Figure 1 presents the sequence diagram of the proposed method for the orientation of metal dispersion reinforcing elements in concrete, including the preparation of concrete mix in concrete mixer 1, the addition of dispersion reinforcing elements in concrete mix 2, loading the finished concrete mix in vibrodeck 3, the simultaneous impact on the concrete mixture electromagnetic field 4 and vibration 5.

The proposed method of orientation of metal dispersion reinforcing elements in concrete is as follows.

Fine-grained concrete is selected containing sand with a particle size modulus of 1; 1.5; 2 in order not to impede the orientation (rotation) of the dispersion-reinforcing elements in concrete. Mixing of prepared concrete with dispersed reinforcing elements takes place in a concrete mixer with a uniform supply of dispersed reinforcing elements into it to prevent their clumping, as well as for their uniform distribution in the entire volume of the concrete mixture. Dispersed reinforcing elements of factory manufacture from steel wire are used, with a diameter of 1-2 mm, a length of 30-60 mm for the best orientation in a concrete mix.

Thus prepared mixture is loaded into a vibration formwork, which is placed in a device that creates an electromagnetic field, and at the same time vibration and electromagnetic devices are turned on. The choice of electromagnetic field induction depends on the viscosity of the concrete mixture, the size of the dispersion-reinforcing elements, the density of the reinforcement, as well as the optimal energy consumption. It is known (Matus E.P. Magnetic field orientation of steel wire segments in concrete mixes / E.P. Matus, V.G. Bezborodov // Transactions of NGASU - Novosibirsk: NGASU. 1999 - Issue 3 (4) - P.29- 34.) that the magnitude of electromagnetic induction can be calculated by the following formula:

B = 2.5 · k · l / (m · d),

Where:

k is the ultimate shear stress during the rotation of the dispersion-reinforcing element;

l is the length of the dispersion reinforcing element;

m is the saturated magnetization of steel;

d is the diameter of the dispersion reinforcing element.

Based on their formulas, the electromagnetic field for the orientation of the dispersion-reinforcing elements should have an induction of 0.12-0.36 T and this value of electromagnetic induction should apply to the entire volume of the concrete mixture in which the dispersion-reinforcing elements are oriented, this value of electromagnetic induction is due to the viscosity concrete mix, the size of the dispersed reinforcing elements, the density of reinforcement, as well as the optimal energy consumption.

Thus, this method of orienting dispersion-reinforcing elements in concrete by an electromagnetic field with the simultaneous impact of vibration allows you to orient the dispersion-reinforcing elements in the entire volume of concrete, more fully use their properties when working with this structural element, which will increase its operational properties, and will allow to economically consume materials, due to the lower consumption of dispersion-reinforcing elements and concrete, as well as in the manufacturing process of reinforced concrete products, you can not use rod ar Aturi that will automate the production lines for the manufacture of concrete products.

Claims (1)

A method of orienting metal dispersion reinforcing elements in concrete, including preparing concrete, adding metal dispersion reinforcing elements to it, loading the concrete mixture into a vibrodeck, characterized in that aggregate with a particle size of 1, 1.5, 2 is added to the concrete, with continuous with stirring, dispersed reinforcing elements with a diameter of 1-2 mm, a length of 30-60 mm are uniformly fed into it, then the resulting mixture is loaded into a vibration formwork and simultaneously exposed to it by vibration and an electromagnetic field with induction 0.12-0.36 T.

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