RU2536531C2 - Hydraulic dispersion-mixing unit to produce high-adhesion binding and fine concretes - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to the production of high-adhesion binding and fine concretes. The proposed hydraulic dispersion-mixing unit to produce high-adhesion binding and fine concretes comprises a frame and a screw auger. The screw auger blades have shaped holes that vary subject to the auger sizes: the number of holes increases from "n₁" at the auger initial part to "n_m" at the auger end part; the size of holes decreases from "k₁" at the auger initial part to "k_m" at the auger end part, all the holes being located radially around the circle on the surface of blades.

EFFECT: superfine suspension-emulsion binders with higher adhesion to a solid surface are obtained.

2 dwg, 1 tbl

Description

The invention relates to the construction of high-speed mixing of water-solids to obtain highly dispersed suspension-emulsion binders with increased adhesion to a solid surface, for example, cement concrete aggregates and other solid surfaces, due to smaller dispersed particles.

Known rotary concrete mixer SB-146 [1], which provides for a change in the placement of the blades for mixing the mortar and concrete aggregates:

- at an angle of 75 ° in a vertical position;

- at an angle of 45 ° and 38 ° to a plane, a plane perpendicular to the direction of movement;

- reducing the lower and increasing the upper lengths of the edges of the blades to maintain the working area.

The proposed technology allows to increase the strength of concrete samples only by 10 ... 12%. The installation of the mixer blades does not improve the uniformity of the mixture.

1. Known hydrodynamic mixer-activator [2], which promotes the activation of a viscous cement mixture to obtain a suspension by additional mixing with a supersonic stream of air to increase the degree of binder hydration by 1.3 ... 1.5 times.

The disadvantage of this technology is the two-stage loading of components and a large consumption of binder (470 ... 500 kg / m), a slight increase in strength properties (-18%).

2. Known high-speed screw mixers [3] with a design that allows:

- cause shear stress due to incisions in the disks in the immediate vicinity of the water;

- carry out the forcing of the liquid medium under the action of high pressures (35 MPa) through small annular gaps;

- carry out dispersion by ultrasound with a voltage of 5000 V high frequency through plates immersed in transformer oil to form a fountain, which is an ultrasonic field, for the formation of small droplets in dispersants.

The disadvantage of the proposed technology is a large energy consumption and a small amount of processed liquid, as well as the inability to disperse highly viscous media.

3. Differential screw mixer (prototype) [4]. The design of the mixer is a 2-shaft countercurrent screw mixer. Mixing of the concrete composition is carried out by the work of two auger blade devices rotating in opposite directions, having large gaps between the blades in both vertical and horizontal directions.

The disadvantage of the proposed technology is the unsatisfactory uniformity of the obtained fine-grained concrete mixtures due to the small area of the blades. The auger mixer has a complex structure: the loss of a number of blades will lead to an increase in time of an already heterogeneous concrete mixture.

The technical result of the invention is to obtain highly dispersed suspension-emulsion binders with increased adhesion to a solid surface.

The technical result is achieved by the fact that the hydraulic dispersion-mixing apparatus for producing highly adhesive cementitious and fine-grained concrete includes a skeleton and a screw auger. According to the invention, the screw screw blades have shaped holes that vary depending on the size of the screw: the number of holes increases from "n ₁ " in the initial to "n _m " in the final part of the screw; the size of the holes decreases from "k ₁ " in the initial to "k _m " in the final part of the screw; all holes on the surface of the blades are located radially around the circumference.

Figure 1 - is a diagram of a hydraulic dispersion-mixing apparatus for producing highly adhesive binders and fine-grained concrete; figure 2 is a section 1-1 of figure 1.

The proposed hydraulic dispersion-mixing apparatus for the production of highly adhesive cementitious and fine-grained concrete includes: 1 - screw auger, 2 - ball valve; 3 - receiving funnel; 4 - the principle of placement of figured holes.

The technical result is achieved by obtaining finer dispersed particles of high energy force in a droplet liquid of various sizes, which are formed during countercurrent dynamic jet collisions and shear stresses that can lead to the formation of a crystalline structure of cement stone and a significant reduction in the size of the binder mineral filler to colloidal suspension size.

Table 1 presents the test results of prototypes of fine-grained cement concrete with a cement / sand ratio of Ts / P-1/4.

Table Test results of prototypes of fine-grained cement concrete Bending Strength, kg / cm ² Compressive strength, kg / cm ² Normal 8.1 (B = 6) 95 (B = 74) Activated 13.5 (B = 11) 131 (B = 96)

In comparison with the known, the present invention has a simpler design. The strength of fine-grained cement concrete in bending increases by 66.7%, in compression by 37.9% in comparison with control samples.

Literature:

1. Bogomolov A.A. Investigation of the influence of the installation schemes of the blades in a rotary mixer on the energy intensity and quality of mixtures / A.A. Bogomolov, G.I. Chemerichko, V.D. Dimitrenko, A.I. Ermolov // All-Union Conference. Basic research and new technologies in building materials science. 4.6. Technique and technology of grinding, mixing and classification of materials. - Belgorod, 1989 .-- p. 68-69.

2. Danilov M.P. Preparation of concrete mixture with hydrodynamic activation of a binder / M.P. Danilov, V.E. Naumenko, V.A. Drake // All-Union Conference. Basic research and new technologies in building materials science. 4.6. Technique and technology of grinding, mixing and classification of materials. - Belgorod, 1989 .-- p. 74-75.

3. Kozhevnikov S.O. Methods for the dispersion of liquid media / S.O. Kozhevnikov, P.P. Guyumdzhyan // Information environment of the university. Materials of the XV international scientific and technical conference. - Ivanovo, 2008, - p. 865-868.

4. Paddle mixers. - URL: http://www.tsvetkovamila.ru/shnekia4.html. Date of treatment 06/27/2012.

Claims (1)

A hydraulic dispersion-mixing apparatus for producing highly adhesive cementitious and fine-grained concrete, including a skeleton, a screw screw, characterized in that the screw screw blades have shaped holes that vary depending on the size of the screw: the number of holes increases from "n ₁ " in the initial to " n _m "in the final part of the screw; the size of the holes decreases from "k ₁ " in the initial to "k _m " in the final part of the screw; all holes on the surface of the blades are located radially around the circumference.

Images