Concrete construction method for controlling setting time and special equipment thereof

Abstract

The present invention discloses a concrete construction method for controlling setting time and special equipment thereof. The technical solution comprises processes of mixing, pumping, extruding, forming, setting and hardening. An electric treatment of applying an external electric field to a concrete mixture is provided between the pumping and the extruding process. The mixture treated by the external electric field is immediately extruded through an extrusion outlet. The special equipment comprises a transporting pump, a transporting pipeline and an extrusion device. The extrusion device comprises an equipment for electrical process and the extrusion outlet. By adopting the construction solution and equipment in the present technical solution, an effect on rapid controlling or adjusting the concrete setting time is achieved and an early strength of concrete is rapidly and rationally enhanced. A requirement of adjusting concrete setting time at will before the forming process is met.

Claims

1. A concrete construction equipment for controlling setting time, comprising: a transporting pump, a transporting pipeline and an extrusion device; wherein the extrusion device comprises an electric treatment equipment and an extrusion outlet; the electric treatment equipment is connected with the transporting pipeline; the extrusion outlet is provided behind the electric treatment equipment; wherein the electric treatment equipment comprises an insulating pipeline and at least one set of electrodes in contact with a concrete mixture; and an electric field is formed between electrodes after being electrified; the concrete mixture comprises an activator agent; the activator agent comprises one or more of sodium hydroxide, potassium hydroxide, sodium carbonate, potassium carbonate, and water glass; wherein the at least one set of the electrodes in the electric treatment equipment comprises a central electrode arranged in a centre of the electric treatment equipment and a circular electrode arranged on an inner wall of the insulating pipeline; the circular electrode covers the whole inner wall of the insulating pipeline in a circumferential direction of the insulating pipeline; formed electric field intersects with a flowing direction of the mixture; the transporting pump is a power equipment for pressurizing, transporting and extruding the concrete mixture; the transporting pipeline is a pipeline connected between the transporting pump and the electrical treatment device and configured to bear pressure; the electrical treatment device is a device providing an external electric field to the concrete mixture and creating a current; and the extrusion outlet is an opening for extruding an electrically-treated mixture.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 shows a flow diagram of a concrete construction method for controlling setting time.

(2) FIG. 2 shows a composition diagram of a special equipment of a construction method for controlling setting time, wherein the direction of arrow indicates a flow direction of the mixture.

(3) FIG. 3 shows a cross section view of M-M in FIG. 2 when a set of electrodes consists of two electrodes: electrode A and electrode B.

(4) FIG. 4 shows a cross section view of M-M in FIG. 2 when a set of electrodes consists of three electrodes: electrode A, electrode B and electrode C.

(5) FIG. 5 shows a cross section view of M-M in FIG. 2 when in another condition, a set of electrodes consists of two electrodes: electrode A and electrode B.

DETAILED DESCRIPTION

(6) An embodiment is provide for further describing the technical solution of the present invention. However, the protection scope of the present invention is not limited to this.

(7) As shown in FIG. 1, the concrete construction method for controlling setting time, comprises the following processes:

(8) a. mixing: evenly mixing a concrete raw material with mixing water and aggregate to form a concrete mixture; the concrete raw material at least comprises an activator and a cementing material comprising a powdery active material containing silicon-aluminum oxides;

(9) b. pumping: pumping the concrete mixture to an extrusion device through a transporting pipeline;

(10) c. extruding: extruding the concrete mixture through an extrusion outlet;

(11) d. forming: forming a construction component with a required size and shape; and

(12) e. setting and hardening: setting and hardening the construction component;

(13) Between the step b pumping and the step c extruding, an electric treatment step of applying an external electric field to the concrete mixture is further included; the concrete mixture applied with the external electric field is immediately extruded through the extrusion outlet.

(14) Usually in the electric process with the external electric field, when the external electric field is an alternating current with 380V per meter, the mixture will coagulate and harden in 8 minutes; when the applied electric field is an alternating current with 110V per meter, the mixture will coagulate and harden in 11 minutes. The hydration rate of the cementing materials is significantly accelerated, and the setting time is well controlled. The mixture is immediately extruded after the electric process through the extrusion outlet (extrusion must be before the setting and the hardening processes in accordance with the requirements). The concrete raw materials comprise the cementing materials. the quality composition of the cementing materials comprises: 78 parts of the powdery active material containing silicon-aluminum oxides, 4 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 1 part of water-reducing agent, 1.5 parts of the retarder, 1 part of the swelling agent and 1.2 parts of the admixture. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material at least comprises homogenously-mixed one or more of granulated blast furnace slag powder, grinded steel cinder, fly ash and grinded calcined shale.

(15) The specific and common composition of the cementing material comprising the activator as well as the powdery active material containing silicon-aluminum oxides, is listed below in the table.

(16) TABLE-US-00001 TABLE 1 Common Common Common Common Common Common composition 1 composition 2 composition 3 composition 4 composition 5 composition 6 Composition of Sodium Sodium Potassium Sodium Sodium Potassium the cementing hydroxide carbonate hydroxide hydroxide hydroxide carbonate materials Granulated Water glass Sodium Sodium Water glass Sodium blast carbonate carbonate hydroxide furnace slag powder Grinded Fly ash Granulated Granulated Grinded grinded calcined blast blast slag calcined shale furnace slag furnace slag coal gangue powder powder Water Bayer Fly ash Grinded Grinded Grinded reducing process red steel cinder calcined calcined agent mud clay clay minerals minerals Swelling Retarder Admixture Swelling Phosphate Grinded agent agent slag calcined powder, shale

(17) The specific mass composition of the cementing materials can be in a range of:

(18) 1. 78 parts of powdery active material containing silicon-aluminum oxides, 4 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 1 part of a water reducing agent, 1 part of a retarder, 1 part of a swelling agent and 1.2 parts of an admixture. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material comprises homogenously-mixed one or more of granulated blast furnace slag powder, grinded steel cinder, fly ash, and grinded calcined shale;

(19) 2. 60 parts of powdery active material containing silicon-aluminum oxides, 3 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 2 part of a water reducing agent, 3 part of a retarder. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material comprises homogenously-mixed one or more of grinded steel cinder, fly ash, and grinded calcined shale;

(20) 3. 76 parts of powdery active material containing silicon-aluminum oxides, 4 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 1 part of a water reducing agent, 1.5 part of a retarder, 2 part of a swelling agent and 1.2 parts of an admixture. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material comprises homogenously-mixed one or more of granulated blast furnace slag powder, grinded steel cinder, fly ash, and grinded calcined shale;

(21) 4. 80 parts of powdery active material containing silicon-aluminum oxides, 5 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 3 part of a water reducing agent, 2 part of a retarder, 1 part of a swelling agent and 15 parts of an admixture. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material comprises homogenously-mixed one or more of granulated blast furnace slag powder, grinded steel cinder, and fly ash;

(22) 5. 75 parts of powdery active material containing silicon-aluminum oxides, 6 parts of the activator calculated as Na.sub.2O+0.658 K.sub.2O mixture, 5 part of a swelling agent and 10 parts of an admixture. The powdery active material containing silicon-aluminum oxides is a kind of powdery material with a pozzolanic activity and a specific surface area larger than 200 m.sup.2/kg, obtained through high-temperature treatment or high-temperature processing; main chemical compositions of the powdery active material are silicon-aluminum oxides. The active material comprises homogenously-mixed one or more of granulated blast furnace slag powder, grinded steel cinder, and grinded calcined shale.

(23) As shown in FIG. 2, FIG. 3, FIG. 4 and FIG. 5, the special equipment of a concrete construction method for controlling setting time in the technical solution comprises a transporting pump 1, a transporting pipeline 2 and an extrusion device 3. The extrusion device comprises an electric treatment equipment 31 and an extrusion outlet 32. The electric treatment equipment 31 is connected with the transporting pipeline 2 and extrusion outlet 32 is provided behind the electric treatment equipment. The electric treatment equipment 31 comprises the insulating pipeline 311 and the corresponding electrodes 312. The electrodes 312 are in contact with the concrete mixture and a voltage difference is provided between electrodes after being electrified. The transporting pump is a power equipment for pressurizing, transporting and extruding the concrete mixture; the transporting pipeline is a pipeline connected between the transporting pump and the electrical treatment device and configured to bear pressure; the electrical treatment device is a device providing an external electric field to the concrete mixture and creating a current; and the extrusion outlet is an opening for extruding an electrically-treated mixture. The electrodes can consist of electrode A 312 and electrode B312 as shown in FIG. 3, wherein the created electric field intersects with a direction of the mixture flowing; or can consist of electrode A312, electrode B312 and electrode C312 as shown in FIG. 4, wherein the created electric field intersects with a direction of the mixture flowing and 3 phase power supply is provided; or can consist of electrode A 312 and electrode B312 as shown in FIG. 5, wherein electrode A312 is an central electrode and electrode B312 is an circumferential electrode surrounding the central electrode and the created electric field intersects with a direction of the mixture flowing.

(24) The foregoing description of specific embodiments of the present invention is provided for the purpose of understanding the method and core idea of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations can be made based on the present invention without departing from the principles and spirits of the invention, which are also within the scope of the claims of the present invention.