RU2753433C1 - Method for manufacturing sulfur concrete - Google Patents

Abstract

FIELD: construction materials production.

SUBSTANCE: invention relates to the production of building materials, in particular to the manufacture of concrete products and road surfaces. The method for manufacturing concrete using technical sulfur as a binder includes dosing of mineral fillers and sulfur, mixing them in a mixer, unloading from the mixer and molding at ambient temperature, followed by high-frequency exposure to a broadband emitter with a frequency of 40-50 kHz for 3-10 minutes to ensure the transition of sulfur from a solid aggregate state to a liquid, cooling and setting of the binder due to contact with the mineral filler.

EFFECT: simplification and reduction of the cost of the process of manufacturing sulfur concrete, acceleration of the process of gaining the strength of sulfur concrete, increasing productivity.

1 cl, 1 tbl

Description

The invention relates to the field of production of building materials, in particular to the manufacture of concrete products and road surfaces.

Sulfur concrete is a modern composite material, which is based on inert aggregates and fillers that serve as a structural frame, and a binder - technical sulfur with modifying additives.

Structures made of sulfur concrete have high thermal insulation properties, strength, they are resistant to the chemical attack of acids, salts, oils, etc. ...

There is a known method for the production of concrete using technical sulfur as a binder (RF patent for invention No. 2655859, publ. 05/29/2018), including loading the components into bins, heating the components, dosing the components and mixing them in the mixer. The components of the mixture are loaded into three bins, two of which are loaded with inert components, and one with sulfur. The first stage of heating is carried out in the bins with loaded components. From the heated hoppers through the feeders, each component of the mixture is directed to its own auger-heater. The second stage of heating the components is carried out in the heating screws. From the augers-heaters, all components of the mixture are sent to a multicomponent batcher for weighing. After that, from the multicomponent dispenser through the loading window with a shutter, the components are directed to at least one heated mixer, in which the third heating stage is performed, during which the mixture is heated to 130-140 ° C. Stirred and then through the discharge chute with a shutter is unloaded from the mixer.

There is a known method (RF patent for invention No. 2223991, published on 02/20/2004), including the modification of sulfur, mixing the modified sulfur with bitumen and mixing the resulting sulfur bitumen with a mineral filler, and the bitumen is preheated to a temperature of 125-170 ° C and activated by cavitation-acoustic exposure, then sulfur is modified by introducing 0.5-10.0 wt.% of activated bitumen and cavitation-acoustic exposure for 5-15 minutes at a temperature of 125-170 ° C, after which the modified sulfur and activated bitumen are mixed in weight ratios (0.03-1): 1 by cavitation-acoustic impact at a circulation rate of 3-10.

The disadvantages of this method include the need for preliminary activation of bitumen, which complicates the technology, as well as insufficient strength of the resulting material.

A known method of producing a mixture for sulfur concrete (RF patent for invention No. 2401819, publ. 20.10.2010), including the modification of sulfur by introducing bitumen into it in an amount of 1-8 wt.% At a temperature of 125-155 ° C and exposure for 1 -10 min with low frequency ultrasound; mixing of modified sulfur with a mixture of mineral filler heated to 125-155 ° C - sand, crushed stone and fly ash with molten sulfur in a weight ratio of fly ash with sulfur (0.2-3.0): 1, with a weight ratio of modified sulfur to the specified mixture (0.001-0.05): 1. To obtain a mixture for sulfur concrete for a road surface, 5-20 wt.% Of bitumen is additionally introduced into the specified heated mixture of a mineral filler and molten sulfur.

The disadvantage of the known solutions is the significant energy consumption for heating all the components that make up the sulfur concrete and its further maintenance in a heated state until full use. In addition, special machines are required to deliver hot sulfur concrete to the application site.

The claimed invention is aimed at reducing energy costs for the production of sulfur concrete and simplifying the process of delivering the components of the mixture to the paving site.

The technical result is to simplify and reduce the cost of the process of manufacturing sulfur concrete, accelerate the process of gaining strength of sulfur concrete, and increase productivity.

The technical result is achieved due to the fact that the method of making concrete using technical sulfur as a binder includes dosing mineral fillers and sulfur, mixing them in a mixer, unloading from the mixer and molding at ambient temperature, followed by high-frequency exposure to a broadband radiator with a frequency of 40-50 kHz for 3-10 minutes to ensure the transition of sulfur from a solid state of aggregation to a liquid state, by cooling and setting the binder due to contact with the mineral filler.

The sulfur concrete of the present invention includes technical sulfur, which is mixed with a mineral filler (quarry sand, quarry crushed stone) at any ambient temperature. Technical sulfur, used as a binder, provides the composition's resistance to aggressive media, increased frost resistance, and high tensile strength to bending loads.

Sand and crushed stone are fillers and provide the strength characteristics of the composition.

In this case, for the modification of sulfur, various modifiers based on diene hydrocarbons (dicyclopentadiene), olefinic hydrocarbons, and oil refining wastes can be used.

The resulting mixture is unloaded into molds, processing is carried out for 3-10 minutes with a broadband directional emitter with a power of at least 50 kW with an operating frequency range of 40-50 kHz, followed by cooling for 5-10 minutes, the finished samples are removed from the mold. In general, the duration of treatment depends on the power of the emitter.

The road surface can be obtained in the same way. In addition, the mixture can be compacted using a vibrator. In the case of paving, the equipment is installed on a P5770C ABG paver or equivalent.

High-frequency exposure to electromagnetic waves with a resonance frequency close to the resonance frequency of sulfur atoms (43.33 kHz) allows selectively heating only the sulfur contained in the mixture to the melting point, while the contact of sulfur in a molten state with an unheated mineral filler after turning off the emitter , ensures its rapid cooling and hardening.

Below is a table illustrating examples of using the proposed method:

Table 1

Example 1 Example 2 Example 3 The composition of the mixture Technical sulfur, wt.h. 1 1 1 Crushed stone, parts by weight 4.5 3.4 2.5 Sand, parts by weight 4.2 3.2 2,3 Characteristics of finished samples Compressive strength, MPa 85 83 80 Flexural strength, MPa 11.5 11.3 11.0 Tensile strength, MPa eight eight 7 Strengthening time, min 3 5 6

Strength tests were carried out at a compression rate of 1000 N / s using a press in which the prepared test pieces were placed. The tests were carried out until the samples were completely destroyed.

To prepare a mixture for sulfur concrete, quarry sand was used, for example, sand from crushing screenings, the grain size of which is up to 5 mm, and quarry crushed stone with a grain size of 5-40 mm.

The resulting composition of sulfur concrete has high strength characteristics and a short curing time.

The proposed method is characterized by the possibility of application in a wide temperature range from -30 to +50 ° C.

The proposed method improves the energy efficiency of the process of molding products and laying the road surface from sulfur concrete by eliminating the need to preheat the components of the mixture. In addition, products obtained by this method are characterized by a high rate of strength gain and product readiness for use.

Claims (1)

A method of making concrete using technical sulfur as a binder, including dosing mineral fillers and sulfur, mixing them in a mixer, unloading from the mixer and shaping at ambient temperature, characterized in that after shaping, a high-frequency effect is carried out with a broadband emitter with a frequency of 40-50 kHz within 3-10 minutes to ensure the transition of sulfur from a solid state of aggregation to a liquid state, followed by cooling and setting of the binder due to contact with the mineral filler.