RU112088U1 - DEVICE FOR ACTIVATION OF WATER MIXING CONCRETE MIX - Google Patents

Abstract

The utility model relates to the production of concrete, concrete products and structures, and in particular to devices for activating mixing water of concrete mixture. Water and additives for concrete are dosed by dispensers 1 and 2, respectively, and fed into the supply tank 3. The additives are mixed with water by device 4. Next, the resulting water is circulated in a closed cycle, passing through homogenizer 5 and activator 6, including electric, ultrasonic and magnetic water treatment. Activated water is exposed to an electric field of 500 V / cm. Exposure to a magnetic field is carried out at a strength of 4200 E. The ultrasonic field is provided by a piezoelectric emitter excited by a voltage of 500 V and a frequency of 17 kHz. Circulation in a closed cycle is carried out from 2-20 times (depending on the requirements for the mobility of the concrete mixture), after which the water is fed through the three-way valve 7 to the mixing of the concrete mixture or to the storage tank.

Description

The utility model relates to the building materials industry and can be used in the production of concrete, concrete products and structures.

A device for activating mixing water of a concrete mixture containing a dispenser of water and additives, a consumable capacity and electrodes (patent RU 2188758) is known. However, this device does not allow for the joint activation of water with additives and does not provide the necessary strength of concrete.

The task of the technical solution is to increase the mobility with increased preservation of the concrete mixture, as well as to increase the strength of concrete, concrete products and structures.

The technical result is to obtain highly mobile concrete mixtures with high shelf life and concrete with high strength.

The task is achieved in that the device for activating the mixing water of the concrete mixture containing the dispensers of water and additives and the supply tank, according to the proposed technical solution, further comprises a homogenizer, an activator and a three-way valve, and the supply tank is made in the form of a mixer with a mixing device. The activator contains blocks of electrical, ultrasonic and magnetic activation of water. As a homogenizer use a dispersant or cavitator, or an emulsifier, or a rotary pulsation apparatus.

Mixing additives with water in the recirculation mode allows you to maintain the stability of the activated water, which significantly reduces the number of recirculation cycles and, accordingly, reduces the process time. Homogenization of water with additives for concrete enhances the effect of the latter, significantly reducing their specific consumption. Under the influence of ultrasound, the degassing of water and the passivation of electrodes are enhanced. Magnetic activation of water for mixing concrete mixes intensifies cement hydration processes in the early stages of hardening and accelerates the release of smaller crystals, which leads to a decrease in porosity and an increase in the density of concrete, and, consequently, their strength. Under the influence of an electric field, water is saturated with metal ions of soluble electrodes and a further process of degassing of water occurs, which also enhances the efficiency of water activation by a magnetic field. In this case, the preservation of the activity of water obtained according to the proposed device increases up to 7 days (with magnetic treatment - only 15-20 hours). Thus, the combined effect of electric, ultrasonic and magnetic fields on water with mechanical intensification in the recirculation mode complements and enhances the action of everyone, changing the structure of water and, ultimately, providing high mobility with increased preservation of concrete mixtures and high strength concrete.

A device for implementing the activation of mixing water of the concrete mixture is presented in figure 1. The device comprises a water dispenser 1 and an additive dispenser 2, a supply container 3, a mixing device 4, a homogenizer 5, an activator 6, a three-way valve 7.

The device operates as follows. Water and additives for concrete are dosed by dispensers 1 and 2, respectively, and fed into the supply tank 3. The additives are mixed with water by device 4. Next, the resulting water is circulated in a closed cycle, passing through homogenizer 5 and activator 6, including electric, ultrasonic and magnetic water treatment. Activated water is exposed to an electric field of 500 V / cm. Exposure to a magnetic field is carried out at a strength of 4200 E. The ultrasonic field is provided by a piezoelectric emitter excited by a voltage of 500 V and a frequency of 17 kHz. Circulation in a closed cycle is carried out from 2-20 times (depending on the requirements for the mobility of the concrete mixture), after which the water is fed through the three-way valve 7 to the mixing of the concrete mixture or to the storage tank.

Tests of activated water obtained according to the proposed device was carried out on a concrete grade M300. The composition of the concrete mixture is presented in Table 1. The test results of the concrete mixture and concrete are presented in Table 2.

Table 1 Concrete grade Cement M500 DO, kg River sand
kg Sand enriched, kg Gravel, fr. 5-20 mm, kg Water, l Plasticizer S-3, kg M300 280 210 650 1220 130 1.4

The determination of the mobility and preservation of the concrete mixture was carried out in accordance with GOST 10181-94 “Concrete mixtures. Test methods ”, compressive strength of concrete - in accordance with GOST 10180-90“ Concretes. Methods for determining the strength of control samples. "

8 experiments were carried out (with No. 1-7 using activated water prepared according to the invention, and No. 8 control, using non-activated water). The number of water recirculation cycles ranged from 1 to 20. The preservation of the mobility of the concrete mixture was determined within 90 minutes after its preparation. To control the dynamics of the set strength of concrete samples, a compression test was carried out after 1, 7 and 28 days.

From table 2 it follows that the activation of mixing water with the number of recirculation cycles from 2 to 20 significantly increases the mobility of the concrete mixture in comparison with the control. So, with one cycle of recirculation, the sediment of the concrete cone after 30 minutes was 4 cm, and after 60 minutes the mixture completely lost mobility. At 20 cycles of recirculation, the cone sludge was 2 cm, and after 60 minutes the mixture also completely lost its mobility, while the concrete strength increased to 42.3 MPa. Optimum results were shown by experiment No. 4 with 8 cycles of recirculation of mixing water. The persistence of the mobility of the concrete mixture with an increase in recirculation cycles of more than 8 is sharply reduced. This is due to the enhanced properties of activated water, as a result of which the hardening of the concrete mix proceeds faster and more intensively. Nevertheless, a large number of recycling cycles allows to obtain concrete with a strength of up to 38% more than the strength of control samples (42.3 MPa in experiment No. 7 versus 30.7 MPa in experiment No. 8). The optimum mode of mixing water activation was selected as the mode with the number of cycles of 8, while high mobility of the concrete mixture (sediment cone 20 cm) and its persistence over a long period of time (90 minutes) are observed. Samples obtained in this mode are characterized by increased strength (by 26% compared to control samples).

Using the proposed technical solution allows to obtain concrete mixtures with high mobility and its preservation, as well as concrete with high strength characteristics. Deep homogenization of mixing water with additives and mechanical intensification of the process can significantly enhance the effect of the additives used. The use of an activator based on the action of electric, ultrasonic and magnetic fields, together with homogenization, can significantly increase the mobility of the concrete mix and its persistence over a long period of time, as well as produce high-strength concrete.

table 2 Experience number Number of water recirculation cycles Concrete Mix Characterization Concrete characteristic Cone draft, cm Compressive strength, 1 day, MPa Compressive strength, 7 days, MPa Compressive Strength, 28 days, MPa 1 min 15 minutes 30 minutes 60 min 90 min The claimed one one 16 fourteen four - - 11.7 23.9 33,4 2 2 eighteen 16 eleven 3 - 12.5 24.8 34.6 3 5 twenty 19 eighteen 17 fifteen 12.7 26.2 36.3 four 8 twenty twenty 19 eighteen 17 14.3 29.8 38.7 5 12 twenty eighteen 9 2 - 13.3 29.6 37.9 6 16 twenty 16 5 one - 14.3 31,2 39.8 7 twenty 21 fifteen 2 - - 14.8 33.8 42.3 Control 8 0 fourteen 10 four - - 4.4 21,2 30.7

Claims (3)

1. A device for activating mixing water of a concrete mixture containing dispensers of water and additives and a consumable container, characterized in that the device further comprises a homogenizer, activator and a three-way valve, and the consumable container is made in the form of a mixer with a mixing device. 2. The device according to claim 1, characterized in that the activator contains blocks of electrical, ultrasonic and magnetic activation of water. 3. The device according to claim 1, characterized in that as a homogenizer use a dispersant, or cavitator, or emulsifier, or a rotary pulsation apparatus.