CN110759702B - High freeze-thaw resistance marine concrete preparation kiln - Google Patents

High freeze-thaw resistance marine concrete preparation kiln Download PDF

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Publication number
CN110759702B
CN110759702B CN201911123300.8A CN201911123300A CN110759702B CN 110759702 B CN110759702 B CN 110759702B CN 201911123300 A CN201911123300 A CN 201911123300A CN 110759702 B CN110759702 B CN 110759702B
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bevel gear
fixed
annular
cabin
gear
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CN110759702A (en
Inventor
陈喜旺
张登平
李强
王军
孔凡敏
王丽丽
李燕伟
王杰之
张弯
李威
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BCEG Advanced Construction Materials Co Ltd
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BCEG Advanced Construction Materials Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26Silicates of the alkali metals
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20Resistance against chemical, physical or biological attack
    • C04B2111/24Sea water resistance
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

Abstract

The invention discloses a high freeze-thaw resistance marine concrete preparation kiln, and relates to the technical field of marine concrete, wherein freeze-thaw resistance marine concrete comprises a component A and a component B, wherein the component A comprises portland cement, broken stone, yellow sand and a water reducing agent; the component B is silicon carbide modified water glass. The preparation method comprises preparing component A according to a ratio, and adding component A into a stirring cabin for fully stirring; weighing water glass and silicon carbide powder, putting into a reaction cabin, and fully reacting under a water bath condition to obtain a component B; and fully stirring the component A and the component B for 0.5 to 1 hour at normal temperature to obtain a final product. The freeze-thaw resistant marine concrete has the advantage of improving the freeze-thaw resistance of the marine concrete, and in addition, the preparation method has the advantage of improving the compressive strength of the freeze-thaw resistant marine concrete.

Description

High freeze-thaw resistance marine concrete preparation kiln
Technical Field
The invention relates to the technical field of marine concrete, in particular to a high freeze-thaw resistance marine concrete preparation kiln.
Background
At present, marine concrete mostly refers to concrete used in ocean engineering, and is used in structures frequently subjected to spray impact.
The prior art can refer to Chinese invention patent with publication number CN106431026A, which discloses a silicon-aluminum based marine concrete material and a preparation method thereof, and the method comprises the steps of mixing and grinding mineral admixture, portland cement clinker and diagenetic agent to prepare silicon-aluminum based cementitious material; mixing the prepared silicon-aluminum-based cementing material, aggregate, an additive and water, and uniformly stirring; pouring the prepared silicon-aluminum-based marine concrete slurry into a mould for curing to prepare the silicon-aluminum-based marine concrete material. The silicon-aluminum based gel material is added in the preparation process, so that the durability and seawater corrosion resistance of the final product are improved.
However, the marine concrete has low freeze-thaw resistance due to large temperature difference between the early and late days in the marine, river and lake environments, and cannot meet the requirement that the marine concrete is in a low-temperature environment for a long time.
Disclosure of Invention
Aiming at the defects in the prior art, the first object of the invention is to provide the high freeze-thaw resistance marine concrete which has the advantage of improving the freeze-thaw resistance of the marine concrete.
The second purpose of the invention is to provide a preparation method of the high freeze-thaw resistance marine concrete, which has the advantage of improving the compressive strength of the freeze-thaw resistance marine concrete.
In order to achieve the first object, the invention provides the following technical scheme:
the high-freeze-thaw resistance marine concrete is prepared from the following components in parts by mass of 50-200: 1, wherein the component A is prepared from the following raw materials in parts by weight: 4-5 parts of portland cement, 10-12 parts of broken stone, 6-8 parts of yellow sand and 0.05-0.1 part of a water reducing agent; the component B is silicon carbide modified water glass.
Through adopting above-mentioned technical scheme, the silicic acid gel that precipitates when sodium silicate hardens can block up the inside space of concrete to change the pore structure of concrete, reduce the heat conductivility of concrete through changing pore structure, thereby reduce the influence of ambient temperature to the concrete, improve the freeze-thaw resistance ability of concrete. By adding the silicon carbide into the water glass, the quality of the water glass in unit volume is improved, and the filling degree of the water glass to the concrete pore structure is enhanced.
The invention is further configured to: the water reducing agent comprises one or a combination of more of polycarboxylate, lignosulfonate and sulfonated melamine formaldehyde resin.
By adopting the technical scheme and adding the water reducing agent, the possibility of influence on concrete slump caused by adding the silicon carbide modified water glass into the mixed material can be reduced
In order to achieve the second object, the invention provides the following technical scheme:
a preparation method of high freeze-thaw resistance marine concrete comprises the following steps: preparing a component A according to a ratio, and putting the component A into a concrete preparation kiln; the concrete preparation kiln comprises a reaction cabin and a stirring cabin fixed at the bottom of the reaction cabin; fully stirring the component A in the stirring cabin at normal temperature;
weighing the materials in a mass ratio of 100-120: 1, putting the water glass and the silicon carbide powder into the reaction cabin, and fully reacting in a water bath at 60-75 ℃ to obtain a component B;
and opening a blanking valve arranged at the bottom of the reaction cabin to enable the component B to fall into the stirring cabin, and fully stirring the component A and the component B for 0.5-1h at normal temperature to obtain a final product.
By adopting the technical scheme, the reaction between the silicon carbide and the water glass is carried out under the water bath condition, the water glass is partially cured by heating, the whole moisture content of the mixed water glass and concrete is reduced, and the compressive strength and the flexural strength of the final product are improved.
The invention is further configured to: the reaction cabin comprises an outer shell and an annular inner wall fixed on the inner top surface of the outer shell; the annular inner wall divides the space in the outer shell into a circular inner cavity and an annular outer cavity; a blanking valve used for preventing materials from falling into the stirring cabin is arranged on the inner circumferential surface of the annular inner wall; the bottom of the blanking valve is provided with a stirring component; a water bath cabin is fixed on the outer peripheral surface of the annular inner wall; a hot water inlet pipe and a cold water inlet pipe for injecting water into the water bath cabin and a water outlet pipe for discharging water flow out of the water bath cabin are respectively arranged on the outer peripheral surface of the outer shell in a penetrating manner; an annular baffle is rotatably arranged in the water bath cabin, and a driving device for driving the annular baffle to rotate is arranged in the outer shell;
the stirring assembly comprises a motor mounting box fixed at the bottom of the blanking valve, a motor arranged in the motor mounting box and a stirring shaft fixedly connected with the output end of the motor.
Through adopting above-mentioned technical scheme, throw into silicon carbide powder and water glass respectively and react the under-deck, hot water inlet tube pours into hot water into to the water bath under-deck into, and after the reaction, the result falls into the stirring under-deck by the unloading valve. The cold water inlet pipe injects cold water into the water bath cabin, so that the water bath cabin is cooled, the reaction of the silicon carbide and the water glass is facilitated to be carried out under the water bath condition, the integral moisture content of the mixed water glass and concrete is reduced, and the compressive strength and the flexural strength of a final product are improved.
The invention is further configured to: the driving device comprises an annular through hole formed in the outer peripheral surface of the water bath cabin, a first bevel gear ring fixed on the outer peripheral surface of the annular baffle, a transmission bevel gear rotatably arranged on the inner peripheral surface of the outer shell, a second bevel gear ring rotatably arranged at the bottom of the annular outer cavity, a driven gear fixed on one side of the transmission bevel gear, which is far away from the annular through hole, and a driving gear rotatably arranged on the outer peripheral surface of the stirring cabin; the first bevel gear ring is rotatably arranged in the annular through hole; the transmission bevel gear is meshed with the first bevel gear ring and the second bevel gear ring respectively; the driven gear is meshed with the driving gear; and a transmission mechanism for driving the driving gear to rotate is arranged between the driving gear and the motor.
By adopting the technical scheme, after the transmission mechanism drives the driving gear to rotate, the driving gear drives the first bevel gear ring and the second bevel gear ring to rotate respectively through the transmission bevel gear. The first conical tooth ring drives the annular baffle to rotate, and the opening and closing states of the hot water inlet pipe, the cold water inlet pipe and the water outlet pipe are convenient to adjust through the rotation of the annular baffle, so that water injection and drainage of the water bath cabin are convenient.
The invention is further configured to: the transmission mechanism comprises a limiting circular pipe fixed on the inner circumferential surface of the stirring cabin, a gear mounting box fixed at the bottom of the motor mounting box, a driving bevel gear fixed on the outer circumferential surface of the stirring shaft and a driven bevel gear rotatably mounted on one side, close to the limiting circular pipe, of the gear mounting box; an internal threaded pipe is fixed on one side of the driven bevel gear, which is close to the driven gear; the driving bevel gear is meshed with the driven bevel gear; the internal thread pipe internal thread is connected with the screw thread axle, be provided with the direction subassembly that drive screw thread axle removed along internal thread pipe axial between screw thread axle and the spacing pipe.
Through adopting above-mentioned technical scheme, the motor drives the (mixing) shaft and rotates the in-process, and initiative bevel gear drives driven bevel gear and rotates, and driven bevel gear drives the internal thread pipe and rotates. The threaded shaft moves towards one side close to the driving gear under the guiding action of the guiding assembly. Through setting up transmission device, the motor of being convenient for drives the driving gear and rotates when control (mixing) shaft pivoted.
The invention is further configured to: the guide assembly comprises an extension shaft fixed at one end of the threaded shaft, which is far away from the driven bevel gear, a square limiting piece fixed on the outer peripheral surface of the extension shaft, a strip-shaped through hole formed in the inner peripheral surface of a limiting circular tube, a circular through hole formed in one side, which is close to the limiting circular tube, of the driving gear, and a limiting groove formed in the side wall of the circular through hole and used for being plugged with the square limiting piece; the square limiting piece is connected with the strip-shaped through hole in a sliding mode along the axial direction of the limiting circular tube.
Through adopting above-mentioned technical scheme, the threaded spindle contacts with spacing pipe, and the bar through-hole provides the guide effect for square spacing piece to make the internal thread pipe rotate the in-process drive screw axial and be close to driving gear one side and remove. After the square limiting piece moves to be inserted into the limiting groove, the threaded shaft rotates along with the internal threaded pipe, and the threaded shaft drives the driving gear to rotate through the square limiting piece. The moving direction of the threaded shaft is convenient to adjust through the turning of the motor, and the water injection and drainage conditions in the water bath cabin are adjusted under the condition that the stirring shaft does not stop rotating.
The invention is further configured to: the blanking valve comprises a fixing ring fixed on the inner peripheral surface of the annular inner wall, a supporting column fixedly connected with the inner peripheral surface of the fixing ring and a plurality of rotating shafts uniformly distributed on the outer peripheral surface of the supporting column along the circumferential direction of the supporting column; a fan-shaped baffle is fixed on the peripheral surface of each rotating shaft, and a baffle bevel gear is fixed at one end of each rotating shaft, which is far away from the support column; the inner bottom surface of the annular outer cavity is rotatably provided with an inner conical toothed ring, the outer peripheral surface of the inner conical toothed ring is fixedly connected with the inner peripheral surface of the second conical toothed ring, and the baffle bevel gear is meshed with the inner conical toothed ring.
Through adopting above-mentioned technical scheme, the second taper ring rotates the back and drives interior taper ring and rotate, and interior taper ring drives baffle bevel gear and rotates, and baffle bevel gear passes through the axis of rotation and drives fan-shaped baffle rotation, is convenient for make the material in the reaction chamber fall to the stirring cabin after the fan-shaped baffle upset in, the motor of being convenient for drives the opening of (mixing) shaft pivoted in-process realization unloading valve to fall to the stirring cabin after realizing that water glass and carborundum react and mix with A component.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. by adding water glass, the pore structure of the concrete is changed, and the freeze-thaw resistance of the concrete is improved;
2. silicon carbide is added into the water glass, so that the quality of the water glass in unit volume is improved, and the filling degree of the water glass to a concrete pore structure is enhanced;
3. the water glass is partially solidified by heating, so that the whole moisture content of the mixed water glass and concrete is reduced, and the compressive strength and the flexural strength of a final product are improved.
Drawings
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a cross-sectional view of a highlighted annular baffle of the present invention;
FIG. 3 is a cross-sectional view of the highlighting transfer mechanism of the present invention;
FIG. 4 is an enlarged schematic view at A in FIG. 3;
FIG. 5 is a schematic view showing the structure of the blanking valve of the present invention.
In the figure: 1. a reaction cabin; 11. an outer housing; 111. a hot water inlet pipe; 112. a cold water inlet pipe; 113. a water outlet pipe; 12. an annular inner wall; 13. a circular inner cavity; 14. an annular outer cavity; 2. a stirring chamber; 3. a discharge valve; 31. a fixing ring; 32. a support bar; 33. a support pillar; 34. a fan-shaped baffle plate; 35. a rotating shaft; 36. a baffle bevel gear; 37. an inner tapered toothed ring; 4. a stirring assembly; 41. a motor mounting box; 42. a motor; 43. a stirring shaft; 5. a water bath cabin; 51. an annular baffle; 6. a drive device; 61. an annular through hole; 62. a first bevel ring; 63. a drive bevel gear; 64. a second conical gear ring; 65. a driven gear; 66. a driving gear; 67. a feed through hole; 7. a transport mechanism; 71. a limiting circular tube; 711. a strip-shaped through hole; 72. a gear mounting box; 73. a drive bevel gear; 74. a driven bevel gear; 75. an internally threaded tube; 751. a spring; 752. a circular limiting sheet; 76. a threaded shaft; 77. a square limiting sheet; 78. a circular through hole; 781. a limiting groove; 79. an extension shaft.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "bottom" and "top," "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example 1: the high-freeze-thaw resistance marine concrete comprises the following components in percentage by mass: 1, the A component is prepared from 4 parts of portland cement, 10 parts of crushed stone, 6 parts of yellow sand and 0.05 part of polycarboxylate. The component B is silicon carbide modified water glass.
A preparation method of high freeze-thaw resistance marine concrete comprises the following steps:
preparing the component A according to the proportion, and putting the component A into a concrete preparation kiln. The concrete preparation kiln comprises a reaction cabin 1 and a stirring cabin 2 fixed at the bottom of the reaction cabin 1. The component A is fully stirred for 1 hour in the stirring cabin 2 under the condition of normal temperature.
Weighing the components in a mass ratio of 100: 1, putting the water glass and the silicon carbide powder into a reaction cabin 1, and reacting for 30min under the water bath condition of 60 ℃ to obtain a component B.
And opening a blanking valve 3 at the bottom of the reaction cabin 1 to enable the component B to fall into the stirring cabin 2, and fully stirring the component A and the component B for 0.5h at normal temperature to obtain a final product.
As shown in fig. 1 and 2, the reaction chamber 1 includes an outer shell 11 and an annular inner wall 12 fixed to an inner top surface of the outer shell 11; the annular inner wall 12 divides the space inside the outer housing 11 into a circular inner chamber 13 and an annular outer chamber 14. The outer shell 11 is a cylindrical barrel. A blanking valve 3 for preventing the materials from falling into the stirring cabin 2 is arranged on the inner circumferential surface of the annular inner wall 12; the bottom of the blanking valve 3 is provided with a stirring component 4.
As shown in fig. 1 and 3, the stirring assembly 4 includes a motor mounting box 41 fixed at the bottom of the blanking valve 3, a motor 42 mounted in the motor mounting box 41, and a stirring shaft 43 fixedly connected to an output end of the motor 42. The stirring shaft 43 is used for stirring the materials in the stirring chamber 2. The motor 42 is an asynchronous motor.
As shown in fig. 1 and 2, an annular water bath chamber 5 is fixed to the outer peripheral surface of the annular inner wall 12. The outer peripheral surface of the water bath cabin 5 is provided with a hot water inlet, a cold water inlet and a water outlet. A hot water inlet pipe 111 for injecting water to the hot water inlet, a cold water inlet pipe 112 for injecting water to the cold water inlet, and a water outlet pipe 113 for discharging water from the water bath compartment 5 are formed in the outer peripheral surface of the outer case 11. The stirring chamber 2 is a cylindrical barrel body with an open top, and a feeding through hole 67 for communicating the stirring chamber 2 is formed in the bottom of the outer shell 11. Silicon carbide powder and water glass are respectively put into the reaction cabin 1, 60-75 ℃ water flow is injected into the water bath cabin 5 through the hot water inlet pipe 111, so that components in the reaction cabin 1 react under the water bath condition, and after the reaction is finished, a product falls into the stirring cabin 2 through the discharging valve 3. The cold water inlet pipe 112 injects water flow of 4 ℃ into the water bath cabin 5, so as to cool the water bath cabin 5, and the water flow flows out of the water bath cabin 5 through the water outlet pipe 113.
As shown in fig. 2, an annular baffle 51 is rotatably mounted in the water bath compartment 5, and a first through hole for communicating with the hot water inlet, a second through hole for communicating with the cold water inlet, and a third through hole for communicating with the water outlet are formed in the inner peripheral surface of the annular baffle 51. The outer shell 11 is provided with a driving device 6 for driving the annular baffle 51 to rotate. In the process that the driving device 6 drives the outer shell 11 to rotate, when the first through hole is communicated with the hot water inlet, the second through hole, the cold water inlet, the third through hole and the water outlet are in a staggered state, so that the hot water inlet pipe 111 can conveniently inject water into the water bath cabin 5. When the second through hole and the cold water inlet and the third through hole are in a communicated state with the water outlet, the first through hole and the hot water inlet are in a staggered state, so that the cold water inlet pipe 112 can conveniently inject water into the water bath cabin 5 for cooling, and meanwhile, water flows out from the water outlet.
As shown in fig. 1 and 2, the driving device 6 includes an annular through hole 61 opened on the outer peripheral surface of the water bath compartment 5, a first bevel gear ring 62 fixed on the outer peripheral surface of the annular baffle 51, a transmission bevel gear 63 rotatably mounted on the inner peripheral surface of the outer housing 11, a second bevel gear ring 64 rotatably mounted on the bottom of the annular outer chamber 14, a driven gear 65 fixed on the side of the transmission bevel gear 63 away from the annular through hole 61, and a driving gear 66 rotatably mounted on the outer peripheral surface of the stirring compartment 2. The first bevel ring gear 62 is rotatably mounted in the annular through hole 61. The transmission bevel gear 63 meshes with a first bevel ring gear 62 and a second bevel ring gear 64, respectively. The driven gear 65 meshes with the drive gear 66. Referring to fig. 3, a transmission mechanism 7 for driving the driving gear 66 to rotate is disposed between the driving gear 66 and the motor 42. After the transmission mechanism 7 drives the driving gear 66 to rotate, the driving gear 66 drives the first bevel gear ring 62 and the second bevel gear ring 64 to rotate respectively through the transmission bevel gear 63. The first bevel ring gear 62 rotates the ring-shaped shutter 51.
As shown in fig. 1, the transmission mechanism 7 includes a limit circular tube 71 fixed to the inner circumferential surface of the stirring chamber 2, a gear mounting box 72 fixed to the bottom of the motor mounting box 41, and, with reference to fig. 3 and 4, a drive bevel gear 73 fixed to the outer circumferential surface of the stirring shaft 43, and a driven bevel gear 74 rotatably mounted to the inner side wall of the gear mounting box 72 on the side close to the limit circular tube 71. An internal threaded pipe 75 is fixed on one side of the driven bevel gear 74 close to the driving gear 66, an installation through hole is formed in one side of the gear installation box 72 close to the limiting circular pipe 71, and the internal threaded pipe 75 penetrates through the installation through hole. The stirring shaft 43 is arranged in the gear mounting box 72 in a penetrating way. The drive bevel gear 73 is engaged with the driven bevel gear 74. The internal thread pipe 75 is internally threaded with a threaded shaft 76, one end of the threaded shaft 76, which is far away from the driven bevel gear 74, is fixed with an extension shaft 79, and the outer peripheral surface of the extension shaft 79 is fixed with a square limiting piece 77. The inner peripheral surface of the limiting circular tube 71 is provided with a strip-shaped through hole 711 which axially penetrates through the limiting circular tube 71 along the limiting circular tube 71, and the square limiting sheet 77 is connected with the strip-shaped through hole 711 in a sliding manner along the axial direction of the limiting circular tube 71. The driving gear 66 is provided with a circular through hole 78 at the center of the surface, and the side wall of the circular through hole 78 is provided with a limit groove 781 for being inserted with the square limit plate 77. When the motor 42 drives the stirring shaft 43 to rotate, the driving bevel gear 73 drives the driven bevel gear 74 to rotate, and the driven bevel gear 74 drives the internal threaded pipe 75 to rotate. After the threaded shaft 76 is in contact with the limiting circular tube 71, the strip-shaped through hole 711 provides a guiding function for the square limiting sheet 77, so that the threaded shaft 76 is driven to move towards one side close to the driving gear 66 through the rotation of the internal threaded tube 75. After the square limiting piece 77 moves to be inserted into the limiting groove 781, the threaded shaft 76 rotates along with the internal threaded pipe 75, and the threaded shaft 76 drives the driving gear 66 to rotate through the square limiting piece 77. When the motor 42 drives the stirring shaft 43 to rotate reversely, the threaded shaft 76 moves away from the driving gear 66.
As shown in fig. 4, a spring 751 is fixed to one end of the internally threaded tube 75 close to the drive gear 66, and a circular stopper 752 is fixed to the outer peripheral surface of the threaded shaft 76. When the screw shaft 76 is disengaged from the stopper cylinder 71, the spring 751 is compressed, and the spring 751 applies an elastic force to the circular stopper 752 toward the side close to the drive gear 66.
As shown in fig. 2, the blanking valve 3 includes a fixing ring 31 fixed on the inner peripheral surface of the annular inner wall 12, and, with reference to fig. 5, four support rods 32 uniformly distributed on the inner peripheral surface of the fixing ring 31 along the circumferential direction of the fixing ring 31, support columns 33 fixed on the ends of the support rods 32, four rotation shafts 35 uniformly distributed on the outer peripheral surface of the support columns 33 along the circumferential direction of the support columns 33, and four fan-shaped baffles 34 respectively fixed on the outer peripheral surfaces of the four rotation shafts 35. One end of each rotating shaft 35 is rotatably connected with the supporting column 33, and the other end of each rotating shaft penetrates through the fixing ring 31. A baffle bevel gear 36 is fixed on one end of each rotating shaft 35 far away from the supporting column 33. An inner tapered ring 37 is fixed to the inner peripheral surface of the second tapered ring 64, and the baffle bevel gear 36 is engaged with the inner tapered ring 37. The second conical ring gear 64 rotates to drive the inner conical ring gear 37 to rotate, the inner conical ring gear 37 drives the baffle bevel gear 36 to rotate, and the baffle bevel gear 36 drives the sector baffles 34 to rotate through the rotating shaft 35.
The working principle of the embodiment is as follows:
when the motor 42 drives the stirring shaft 43 to rotate, the driving bevel gear 73 drives the driven bevel gear 74 to rotate, and the driven bevel gear 74 drives the internal threaded pipe 75 to rotate. After the threaded shaft 76 is in contact with the limiting circular tube 71, the strip-shaped through hole 711 provides a guiding function for the square limiting sheet 77, so that the threaded shaft 76 is driven to move towards one side close to the driving gear 66 through the rotation of the internal threaded tube 75. After the square limiting piece 77 moves to be inserted into the limiting groove 781, the threaded shaft 76 rotates along with the internal threaded pipe 75, and the threaded shaft 76 drives the driving gear 66 to rotate through the square limiting piece 77. The drive gear 66 rotates the first bevel ring gear 62 and the second bevel ring gear 64 via the drive bevel gear 63, respectively. The first conical ring gear 62 drives the annular baffle 51 to rotate, so as to adjust the open-close states of the hot water inlet, the cold water inlet and the water outlet.
Example 2: the high-freeze-thaw resistance marine concrete comprises the following components in percentage by mass of 100: 1, and the component A is prepared from 4.5 parts of portland cement, 11 parts of crushed stone, 7 parts of yellow sand, 0.04 part of sodium lignin sulfonate and 0.04 part of sulfonated melamine formaldehyde resin. The component B is silicon carbide modified water glass.
A preparation method of high freeze-thaw resistance marine concrete comprises the following steps:
preparing the component A according to the proportion, and putting the component A into a concrete preparation kiln. The concrete preparation kiln comprises a reaction cabin 1 and a stirring cabin 2 fixed at the bottom of the reaction cabin 1. The component A is fully stirred for 1.5 hours in the stirring cabin 2 under the condition of normal temperature.
Weighing the components in a mass ratio of 110: putting the water glass and the silicon carbide powder of the component 1 into a reaction cabin 1, and reacting for 45min under the water bath condition of 70 ℃ to obtain a component B.
And opening a blanking valve 3 at the bottom of the reaction cabin 1 to enable the component B to fall into the stirring cabin 2, and fully stirring the component A and the component B for 0.8h at normal temperature to obtain a final product.
Example 3: the high-freeze-thaw resistance marine concrete comprises the following components in percentage by mass of 200: 1, the component A is prepared from 5 parts of portland cement, 12 parts of crushed stone, 8 parts of yellow sand, 0.02 part of polycarboxylate and 0.08 part of calcium lignosulfonate. The component B is silicon carbide modified water glass.
A preparation method of high freeze-thaw resistance marine concrete comprises the following steps:
preparing the component A according to the proportion, and putting the component A into a concrete preparation kiln. The concrete preparation kiln comprises a reaction cabin 1 and a stirring cabin 2 fixed at the bottom of the reaction cabin 1. The component A is fully stirred in the stirring cabin 2 for 2 hours under the condition of normal temperature.
Weighing the components in a mass ratio of 120: 1, putting the water glass and the silicon carbide powder into a reaction cabin 1, and reacting for 60min under the water bath condition of 75 ℃ to obtain a component B.
And opening a blanking valve 3 at the bottom of the reaction cabin 1 to enable the component B to fall into the stirring cabin 2, and fully stirring the component A and the component B for 1 hour at normal temperature to obtain a final product.
Comparative example 1: comparative example 1 differs from example 1 in that the B component is water glass.
Comparative example 2: comparative example 2 and example 3 differ in that water glass and silicon carbide powder are reacted at room temperature.
Performance detection test: the final products obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to the following property tests, and the test results are shown in Table 1.
And respectively measuring the thermal conductivity, the freezing resistance, the compressive strength and the flexural strength of the final product according to the SL352-2018 hydraulic concrete test procedures.
TABLE 1
Measurement items Coefficient of thermal conductivity Mass loss rate of-18 to 8 ℃ freeze-thaw cycles 300 times% 28d compressive strength/MPa 28d flexural strength/MPa
Example 1 0.081 0.93 44.36 6.51
Example 2 0.085 0.92 44.57 6.55
Example 3 0.084 0.86 44.63 6.52
Comparative example 1 0.095 2.73 44.95 6.58
Comparative example 2 0.089 1.85 41.06 6.13
As can be seen from table 1, the final product obtained in example 1 has a lower thermal conductivity and a lower mass loss rate in a freeze-thaw cycle environment than in comparative example 1. Silicic acid gel precipitated during the hardening of the water glass blocks the internal pores of the marine concrete, thereby improving the internal pore structure of the marine concrete. The silicon carbide with smaller thermal expansion coefficient is used for modifying the water glass, so that the density of the water glass can be increased, the mass of the water glass in unit volume is increased, the plugging effect of the water glass on the pore structure of the marine concrete is enhanced, the heat conductivity coefficient of the marine concrete is reduced, and the mass loss rate of the marine concrete in a freeze-thaw cycle environment is reduced.
As can be seen from table 1, the compressive strength and the flexural strength of the final product obtained in example 3 are both improved compared to comparative example 2. During the modification process of the silicon carbide, the water glass can be partially solidified in a water bath heating mode, so that the moisture content in the water glass is reduced, the moisture content in the final product is reduced, and the compressive strength and the flexural strength of the final product are improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims (1)

1. A high freeze-thaw resistance marine concrete preparation kiln; the concrete preparation kiln comprises a reaction cabin (1) and a stirring cabin (2) fixed at the bottom of the reaction cabin (1);
the reaction cabin (1) comprises an outer shell (11) and an annular inner wall (12) fixed on the inner top surface of the outer shell (11); the annular inner wall (12) divides the space in the outer shell (11) into a circular inner cavity (13) and an annular outer cavity (14); a blanking valve (3) used for preventing materials from falling into the stirring cabin (2) is arranged on the inner circumferential surface of the annular inner wall (12); the bottom of the blanking valve (3) is provided with a stirring component (4); a water bath cabin (5) is fixed on the outer peripheral surface of the annular inner wall (12); a hot water inlet pipe (111) and a cold water inlet pipe (112) for injecting water into the water bath cabin (5) and a water outlet pipe (113) for discharging water flow out of the water bath cabin (5) are respectively arranged on the outer peripheral surface of the outer shell (11) in a penetrating manner; an annular baffle (51) is rotatably mounted in the water bath cabin (5), and a driving device (6) for driving the annular baffle (51) to rotate is arranged in the outer shell (11);
the stirring assembly (4) comprises a motor mounting box (41) fixed at the bottom of the blanking valve (3), a motor (42) mounted in the motor mounting box (41) and a stirring shaft (43) fixedly connected with the output end of the motor (42);
the driving device (6) comprises an annular through hole (61) formed in the outer peripheral surface of the water bath cabin (5), a first bevel gear ring (62) fixed on the outer peripheral surface of the annular baffle plate (51), a transmission bevel gear (63) rotatably installed on the inner peripheral surface of the outer shell (11), a second bevel gear ring (64) rotatably installed at the bottom of the annular outer cavity (14), a driven gear (65) fixed on one side, far away from the annular through hole (61), of the transmission bevel gear (63), and a driving gear (66) rotatably installed on the outer peripheral surface of the stirring cabin (2); the first conical tooth ring (62) is rotatably arranged in the annular through hole (61); the transmission bevel gear (63) is meshed with the first bevel gear ring (62) and the second bevel gear ring (64) respectively; the driven gear (65) is meshed with the driving gear (66); a transmission mechanism (7) for driving the driving gear (66) to rotate is arranged between the driving gear (66) and the motor (42);
the transmission mechanism (7) comprises a limiting circular tube (71) fixed on the inner circumferential surface of the stirring cabin (2), a gear mounting box (72) fixed at the bottom of the motor mounting box (41), a driving bevel gear (73) fixed on the outer circumferential surface of the stirring shaft (43) and a driven bevel gear (74) rotatably mounted on one side, close to the limiting circular tube (71), of the gear mounting box (72); an internal threaded pipe (75) is fixed on one side of the driven bevel gear (74) close to the driving gear (66); the driving bevel gear (73) is meshed with the driven bevel gear (74); a threaded shaft (76) is connected with the internal thread of the internal threaded pipe (75), and a guide assembly for driving the threaded shaft (76) to move axially along the internal threaded pipe (75) is arranged between the threaded shaft (76) and the limiting circular pipe (71);
the guide assembly comprises an extension shaft (79) fixed at one end, far away from the driven bevel gear (74), of the threaded shaft (76), a square limiting sheet (77) fixed on the outer peripheral surface of the extension shaft (79), a strip-shaped through hole (711) formed in the inner peripheral surface of the limiting circular tube (71), a circular through hole (78) formed in one side, close to the limiting circular tube (71), of the driving gear (66), and a limiting groove (781) formed in the side wall of the circular through hole (78) and used for being plugged with the square limiting sheet (77); the square limiting sheet (77) is connected with the strip-shaped through hole (711) in a sliding manner along the axial direction of the limiting circular tube (71);
the blanking valve (3) comprises a fixing ring (31) fixed on the inner circumferential surface of the annular inner wall (12), supporting columns (33) fixedly connected with the inner circumferential surface of the fixing ring (31), and a plurality of rotating shafts (35) uniformly distributed on the outer circumferential surface of the supporting columns (33) along the circumferential direction of the supporting columns (33); a fan-shaped baffle (34) is fixed on the peripheral surface of each rotating shaft (35), and a baffle bevel gear (36) is fixed at one end, far away from the supporting column (33), of each rotating shaft (35); the inner bottom surface of the annular outer cavity (14) is rotatably provided with an inner conical tooth ring (37), the outer peripheral surface of the inner conical tooth ring (37) is fixedly connected with the inner peripheral surface of a second conical tooth ring (64), and the baffle bevel gear (36) is meshed with the inner conical tooth ring (37).
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