CN112025968A - Processing method of high-compactness concrete precast slab capable of preventing surface cracking - Google Patents
Processing method of high-compactness concrete precast slab capable of preventing surface cracking Download PDFInfo
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- CN112025968A CN112025968A CN202010975932.3A CN202010975932A CN112025968A CN 112025968 A CN112025968 A CN 112025968A CN 202010975932 A CN202010975932 A CN 202010975932A CN 112025968 A CN112025968 A CN 112025968A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/0081—Embedding aggregates to obtain particular properties
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/08—Producing shaped prefabricated articles from the material by vibrating or jolting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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Abstract
The invention discloses a processing method of a high-compactness concrete precast slab capable of preventing surface cracking, which belongs to the technical field of concrete precast slabs and can realize the innovative introduction of defoaming knot net rods, the defoaming knot net rods are uniformly distributed through a uniform magnetic field before solidification, then the defoaming knot net rods are forced to move from the concrete to the surfaces of two sides, bubbles in the concrete can be effectively eliminated, so that the compactness of the formed concrete is improved, the defect of air holes is greatly improved, after the defoaming knot net rods move to the surface of the concrete, the splitting action of the defoaming knot net rods is triggered in a heating mode, so that the defoaming knot net rods are contacted with the adjacent defoaming knot net rods and combined into a net, a high-strength connecting surface is formed through melting and resolidification of phase change nodes, a net-shaped reinforced structure is formed on the surface of the concrete, the contractility is triggered when the temperature is reduced, and the phenomena of water seepage and cracking on the surface of the concrete are prevented, effectively improving the forming strength and compactness of the concrete.
Description
Technical Field
The invention relates to the technical field of concrete precast slabs, in particular to a processing method of a high-compactness concrete precast slab with an anti-surface crack function.
Background
The prefabricated slab is a floor slab used in the early construction of the 20 th century, and is a module or a plate used in engineering. Because the concrete prefabricated member is produced and processed in a prefabricating field and is directly transported to a construction site for installation, the prefabricated member is called a prefabricated plate. When the precast slab is manufactured, a hollow model is firstly nailed by wood boards, reinforcing steel bars are distributed at the hollow part of the model, cement is used for filling the hollow part, after the hollow part is dried, the wood boards are knocked off, and the residual precast slab is the precast slab. Precast slabs are used in many applications in construction, such as cement slabs covered in ditches beside highways; the cement boards used as heat insulation layers on the roof are prefabricated boards.
Although the prefabricated slabs can be prefabricated uniformly at the rear of a factory and then transported to a site for use, the prefabricated slabs are very convenient and quick, the construction cost can be effectively reduced, the strength of the prefabricated slabs is not as good as that of a cast-in-place reinforced concrete structure, particularly the surface strength is reduced, the phenomena of surface water seepage and cracking easily occur, the surface is easily dropped after mechanical impact is applied, and the safety quality and the service life are seriously influenced.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a processing method of a high-compactness concrete precast slab with anti-surface cracking, which can realize the innovative introduction of defoaming knot net rods after concrete pouring, and uniform distribution of the defoaming knot net rods through a uniform strong magnetic field before solidification, then force the defoaming knot net rods to move from the concrete to the surfaces of two sides by changing the magnetic field, and can effectively eliminate bubbles in the concrete in the migration process, thereby improving the compactness after concrete molding, greatly improving the defect of air holes, triggering the splitting action of the defoaming knot net rods in a heating mode after the defoaming knot net rods migrate to the surface of the concrete, so as to contact with the adjacent defoaming knot net rods and combine into a net, forming a high-strength connecting surface through melting and resolidification of phase change nodes, forming a net-shaped reinforcing structure on the surface of the concrete, and the shrinkage force is triggered when the temperature is reduced, so that the surface of the concrete is effectively shrunk, the phenomena of water seepage and cracking on the surface of the concrete are prevented, and the forming strength and the compactness of the concrete are effectively improved.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
A processing method of a high-compactness concrete precast slab with surface cracking prevention comprises the following steps:
s1, weighing and uniformly mixing the raw materials, wherein the raw materials comprise the following components in parts by weight: 270 parts of Portland cement 265-containing materials, 170 parts of water 165-containing materials, 730 parts of fine sand 725-containing materials, 1050 parts of gravel 1000-containing materials, 75-85 parts of mineral powder, 75-80 parts of fly ash, 10-20 parts of polycarboxylic acid water reducing agent, 5-10 parts of composite early strength agent and 2-5 parts of defoaming agent;
s2, brushing a layer of mold release oil in the precast slab mold, pouring the mixed raw materials into the mold, and uniformly vibrating for 10-30S;
s3, uniformly throwing defoaming caking net rods into the mold, applying a uniform magnetic field to force the defoaming caking net rods to be uniformly distributed in the mold, and closing the mold after standing;
s4, after changing the magnetic field, carrying out adsorption distribution on the bubble-eliminating net rods on the upper and lower surfaces of the die, and carrying out auxiliary elimination on bubbles in the raw materials in the migration process;
and S5, heating the mould, triggering the splitting action of the defoaming and knotting net rods, and knotting the defoaming and knotting net rods and the adjacent defoaming and knotting net rods into a net, and demoulding and taking out the formed concrete.
Further, the composite early strength agent is prepared by mixing sodium chloride and anhydrous sodium sulphate according to the mass ratio of 1: 0.8-1.2.
Further, defoaming knot net stick is including the basic post and a plurality of division strip and the magnetism knot lamella that connect gradually, division strip and magnetism knot lamella correspond to be connected, and basic post can play basic setting effect to establish good combined action with the concrete, thereby improve defoaming knot net stick's whole bearing capacity, the division strip can drive the magnetism knot lamella and expand the division action under specific condition, thereby combines into the net with adjacent magnetism knot lamella.
Further, the inner end of the magnetic knot net valve is inlaid and connected with an embedded magnetic block, the embedded magnetic block is mutually close to one end and wrapped by a magnetic isolation sleeve, the embedded magnetic block can endow the magnetic knot net valve with magnetism, not only can respond to an external magnetic field to be distributed and migrated, but also can improve the smoothness of contact connection through magnetic attraction after the division of the magnetic knot net valve, and the magnetic isolation sleeve can shield the magnetic field in a specific direction to avoid blocking the expansion and division actions of the magnetic knot net valve.
Furthermore, the outer end of the magnetic net flap is connected with a plurality of phase change nodes which are uniformly distributed, the phase change nodes are connected with defoaming connecting-assisting fiber bundles in an embedded mode, the defoaming connecting-assisting fiber bundles penetrate through the phase change nodes and are connected with the magnetic net flap, the phase change nodes support and position the defoaming connecting-assisting fiber bundles in a normal state, the phenomenon that the defoaming connecting-assisting fiber bundles are seriously deformed in the migration process is avoided, bubbles in concrete can be eliminated efficiently, after the phase change nodes are heated and melted, the melted phase change nodes can be guided through the bending and detention effects of the defoaming connecting-assisting fiber bundles so as not to be excessively leaked into the concrete, and therefore after the phase change nodes are contacted with the adjacent magnetic net flaps, the phase change nodes are solidified in a film forming mode along with the reduction of temperature and high-strength connection between a pair of magnetic net flaps is established, thereby effectively strengthening and shrinking the concrete and improving the cracking phenomenon of the concrete surface.
Furthermore, be connected with thermal energy between the junction of splitting strip and foundation post and lead the ball, thermal energy leads the ball and keeps away from foundation post one end and is connected with the heat-conducting wire, and the heat-conducting wire runs through magnetism knot lamella and extends to the outside, and the heat-conducting wire can absorb external heat fast and transmit to the phase transition node on the magnetism knot lamella and the thermal energy in the splitting strip leads the ball, and thermal energy leads the ball and forces the splitting strip to week side bending after the thermal expansion to drive magnetism knot lamella and expand the splitting, trigger the action of melting of phase transition node simultaneously, and then realize again after contacting with adjacent magnetism knot lamella and connect.
Furthermore, the phase change node is made of a low-melting-point alloy material mixed with magnetic nano powder, the defoaming connection-assisting fiber bundle is formed by bundling magnetic fibers, the low-melting-point alloy material mixed with the magnetic nano powder is not prone to leaking into concrete due to magnetism after being melted, loss is caused, connection failure of the magnetic net flaps or too low strength is further caused, and the alloy material has certain strength to strengthen and contract the concrete.
Furthermore, the foundation column is made of a high-hardness metal material, the split strips are made of a high-elasticity alloy material, and the magnetic net flaps are made of a heat-conducting metal material.
Further, in the step S5, the heating is performed by high-temperature steam curing, and the heating temperature is higher than the melting point of the phase change node.
Further, in the step S5, when the steam curing condition is not provided, the concrete is demolded when the concrete is solidified, then a layer of plastic film is covered on the surface of the concrete, and the plastic film is watered once every 2 to 4 hours in the day and once every 4 to 6 hours at night, wherein the curing time is 7 to 10 days.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the scheme can realize the innovative introduction of the defoaming knot net rods after concrete pouring, and the defoaming knot net rods are uniformly distributed through a uniform magnetic field before solidification, then the defoaming knot net rods are forced to move from the concrete to the surfaces of two sides through changing the magnetic field, bubbles in the concrete can be effectively eliminated in the migration process, so that the compactness after the concrete is formed is improved, the air hole defect is greatly improved, after the defoaming knot net rods migrate to the surface of the concrete, the defoaming knot net rods are triggered to split through a heating mode, so that the defoaming knot net rods are contacted with the adjacent defoaming knot net rods and combined into a net, a high-strength connecting surface is formed through melting and resolidification of phase change nodes, a net-shaped reinforcing structure is formed on the surface of the concrete, and the contractility is triggered when the temperature is reduced, so that the surface of the concrete is effectively shrunk, and the phenomena of water seepage and cracking on the surface of the concrete are prevented, effectively improving the forming strength and compactness of the concrete.
(2) Defoaming knot net stick is including the basic post and a plurality of division strip and the magnetism knot lamella that connect gradually, and division strip and magnetism knot lamella correspond and connect, and basic post can play basic setting effect to establish good combining action with the concrete, thereby improve defoaming knot net stick's whole bearing capacity, the division strip can drive magnetism knot lamella and expand the division action under specific condition, thereby combines into the net with adjacent magnetism knot lamella.
(3) The inner end of the magnetic knot net valve is inlaid and connected with an embedded magnetic block, the embedded magnetic block is mutually close to one end and is wrapped with a magnetic isolation sleeve, the embedded magnetic block can endow the magnetic knot net valve with magnetism, not only can respond to an external magnetic field to distribute and migrate, but also can improve the smoothness of contact connection through magnetic attraction action after the magnetic knot net valve is split, and the magnetic isolation sleeve can shield the magnetic field in a specific direction to assist in improving the connection contraction strength, so that the magnetic isolation sleeve is prevented from obstructing the unfolding and splitting actions of the magnetic knot net valve.
(4) The outer end of the magnetic net flap is connected with a plurality of phase change nodes which are uniformly distributed, the phase change nodes are connected with defoaming connecting-assisting fiber bundles in an embedded mode, the defoaming connecting-assisting fiber bundles penetrate through the phase change nodes and are connected with the magnetic net flap, the phase change nodes support and position the defoaming connecting-assisting fiber bundles in a normal state, the phenomenon that the defoaming connecting-assisting fiber bundles are seriously deformed in the migration process is avoided, bubbles in concrete can be eliminated efficiently, after the phase change nodes are heated and melted, the melted phase change nodes can be guided through the bending and detention effects of the defoaming connecting-assisting fiber bundles so as not to be excessively leaked into the concrete, and therefore after the phase change nodes are contacted with the adjacent magnetic net flaps, along with the reduction of temperature, the phase change nodes are solidified in a film forming mode and establish high-strength connection between a pair of magnetic net flaps, and further, the concrete is effectively strengthened and shrunk, improving the cracking phenomenon of the concrete surface.
(5) The thermal expansion division ball is connected between the connecting part of the division bar and the foundation column, one end of the thermal expansion division ball, which is far away from the foundation column, is connected with a heat conducting wire, the heat conducting wire penetrates through the magnetic net clack and extends to the outside, the heat conducting wire can quickly absorb external heat and transmit the heat to a phase change node on the magnetic net clack and the thermal expansion division ball in the division bar, the thermal expansion division ball forces the division bar to bend towards the periphery after being heated and expanded, thereby driving the magnetic net clack to expand and divide, and simultaneously triggering the melting action of the phase change node, and further realizing connection after contacting with the adjacent magnetic net clack.
(6) The phase change node is made of a low-melting-point alloy material mixed with magnetic nano powder, the defoaming connection assisting fiber bundle is formed by bundling magnetic fibers, the low-melting-point alloy material mixed with the magnetic nano powder is not prone to leaking into concrete due to magnetism after being melted, loss is caused, then the magnetic net flap is failed to be connected or the strength is too low, and the alloy material has certain strength to strengthen and shrink the concrete.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic structural diagram of the defoaming knot net rod in a distribution state according to the present invention;
FIG. 3 is a schematic structural diagram of the defoaming knot net rod in a migration state according to the present invention;
FIG. 4 is a schematic structural view of the defoaming and netting rod of the present invention in a netting state;
FIG. 5 is a schematic view of the defoaming net rod according to the present invention;
FIG. 6 is a schematic structural view of the defoaming knotted net rod of the present invention in a normal state;
fig. 7 is a schematic structural diagram of the defoaming knot net rod in a splitting state.
The reference numbers in the figures illustrate:
1 defoaming knot net rod, 11 base columns, 12 splitting strips, 13 magnetic knot net flaps, 2 phase change nodes, 3 defoaming connection-assisting fiber bundles, 4 heat conducting wires, 5 thermal expansion division balls, 6 embedded magnetic blocks and 7 magnetism isolating sleeves.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1 to 4, a method for processing a high-compactness concrete precast slab with surface crack prevention includes the following steps:
s1, weighing and uniformly mixing the raw materials, wherein the raw materials comprise the following components in parts by weight: 265 parts of portland cement, 165 parts of water, 725 parts of fine sand, 1000 parts of crushed stone, 75 parts of mineral powder, 75 parts of fly ash, 10 parts of polycarboxylic acid water reducing agent, 5 parts of composite early strength agent and 2 parts of defoaming agent;
s2, brushing a layer of mold release oil in the precast slab mold, pouring the mixed raw materials into the mold, and uniformly vibrating for 10S;
s3, uniformly throwing defoaming caking net rods 1 into the mold, applying a uniform magnetic field to force the defoaming caking net rods 1 to be uniformly distributed in the mold, and closing the mold after standing;
s4, after changing the magnetic field, carrying out adsorption distribution on the bubble-eliminating net rods 1 on the upper and lower surfaces of the die, and carrying out auxiliary elimination on bubbles in the raw materials in the migration process;
and S5, heating the mould, triggering the splitting action of the defoaming knot net rods 1, combining the defoaming knot net rods 1 with the adjacent defoaming knot net rods to form a net, and demoulding and taking out the formed concrete.
The composite early strength agent is prepared by mixing sodium chloride and anhydrous sodium sulphate according to the mass ratio of 1: 0.8.
Referring to fig. 5, the defoaming net rod 1 includes a base column 11, a plurality of splitting bars 12 and magnetic net flaps 13, the splitting bars 12 are connected with the magnetic net flaps 13, the base column 11 can perform a base shaping function and establish a good combination function with concrete, so as to improve the overall bearing capacity of the defoaming net rod 1, and the splitting bars 12 can drive the magnetic net flaps 13 to perform unfolding and splitting actions under specific conditions, so as to combine with the adjacent magnetic net flaps 13 to form a net.
The foundation column 11 is made of high-hardness metal materials, the splitting strips 12 are made of high-elasticity alloy materials, and the magnetic net petals 13 are made of heat-conducting metal materials.
Referring to fig. 6-7, the inner end of the magnetic net petal 13 is connected with the embedded magnetic block 6 in an embedded manner, one end of the embedded magnetic block 6, which is close to each other, is wrapped with the magnetic isolating sleeve 7, the embedded magnetic block 6 can give magnetism to the magnetic net petal 13, and not only can respond to an external magnetic field to distribute and migrate, but also can improve the smoothness of contact connection through magnetic attraction after the magnetic net petal 13 is split, and assist in improving connection contraction strength, and the magnetic isolating sleeve 7 can shield the magnetic field in a specific direction to avoid blocking the unfolding and splitting actions of the magnetic net petal 13.
The outer end of the magnetic net flap 13 is connected with a plurality of phase change nodes 2 which are uniformly distributed, the phase change nodes 2 are connected with defoaming connection-assisting fiber bundles 3 in an embedded manner, the defoaming connection-assisting fiber bundles 3 penetrate through the phase change nodes 2 and are connected with the magnetic net flap 13, the phase change nodes 2 support and position the defoaming connection-assisting fiber bundles 3 in a normal state, and the phenomenon that the defoaming connection-assisting fiber bundles 3 are seriously deformed in the migration process is avoided, so that bubbles in concrete can be efficiently eliminated, and after the phase change nodes 2 are heated and melted, the melted phase change nodes 2 can be guided through the bending and detention effects of the defoaming connection-assisting fiber bundles 3 and are prevented from excessively leaking into the concrete, so that after the phase change nodes 2 are contacted with the adjacent magnetic net flaps 13, along with the reduction of temperature, the phase change nodes 2 are solidified in a film forming manner and establish high-strength connection between a pair of magnetic net flaps 13, thereby effectively strengthening and shrinking the concrete and improving the cracking phenomenon of the concrete surface.
The thermal expansion division ball 5 is connected between the connection part of the division bar 12 and the base column 11, the thermal expansion division ball 5 is made of a material which expands when heated, preferably a material with a large thermal expansion coefficient, one end of the thermal expansion division ball 5, which is far away from the base column 11, is connected with the heat conduction wire 4, the heat conduction wire 4 penetrates through the magnetic joint net clack 13 and extends to the outside, the heat conduction wire 4 can rapidly absorb external heat and transmit the external heat to the phase change node 2 on the magnetic joint net clack 13 and the thermal expansion division ball 5 in the division bar 12, the thermal expansion division ball 5 forces the division bar 12 to bend towards the peripheral side after being heated and expanded, so that the magnetic joint net clack 13 is driven to be unfolded and divided, meanwhile, the melting action of the phase change node 2 is triggered, and then the connection is realized after the division ball is contacted.
In the step S5, the heating is performed by high-temperature steam curing, and the heating temperature is higher than the melting point of the phase change node 2.
And step S5, when the steam curing condition is not available, demoulding when the concrete is solidified, then covering a layer of plastic film on the surface of the concrete, watering once at 2-4 hours in the daytime and watering once at 4-6 hours at night, wherein the curing time is 7-10 days.
Example 2:
referring to fig. 1 to 4, a method for processing a high-compactness concrete precast slab with surface crack prevention includes the following steps:
s1, weighing and uniformly mixing the raw materials, wherein the raw materials comprise the following components in parts by weight: 268 parts of portland cement, 168 parts of water, 728 parts of fine sand, 1025 parts of crushed stone, 80 parts of mineral powder, 78 parts of fly ash, 15 parts of polycarboxylic acid water reducing agent, 8 parts of composite early strength agent and 3 parts of defoaming agent;
s2, brushing a layer of mold release oil in the precast slab mold, pouring the mixed raw materials into the mold, and uniformly vibrating for 20S;
s3, uniformly throwing defoaming caking net rods 1 into the mold, applying a uniform magnetic field to force the defoaming caking net rods 1 to be uniformly distributed in the mold, and closing the mold after standing;
s4, after changing the magnetic field, carrying out adsorption distribution on the bubble-eliminating net rods 1 on the upper and lower surfaces of the die, and carrying out auxiliary elimination on bubbles in the raw materials in the migration process;
and S5, heating the mould, triggering the splitting action of the defoaming knot net rods 1, combining the defoaming knot net rods 1 with the adjacent defoaming knot net rods to form a net, and demoulding and taking out the formed concrete.
The composite early strength agent is prepared by mixing sodium chloride and anhydrous sodium sulphate according to the mass ratio of 1:1.
The remainder was in accordance with example 1.
Example 3:
referring to fig. 1 to 4, a method for processing a high-compactness concrete precast slab with surface crack prevention includes the following steps:
s1, weighing and uniformly mixing the raw materials, wherein the raw materials comprise the following components in parts by weight: 270 parts of portland cement, 170 parts of water, 730 parts of fine sand, 1050 parts of crushed stone, 85 parts of mineral powder, 80 parts of fly ash, 20 parts of polycarboxylic acid water reducing agent, 10 parts of composite early strength agent and 5 parts of defoaming agent;
s2, brushing a layer of mold release oil in the precast slab mold, pouring the mixed raw materials into the mold, and uniformly vibrating for 30S;
s3, uniformly throwing defoaming caking net rods 1 into the mold, applying a uniform magnetic field to force the defoaming caking net rods 1 to be uniformly distributed in the mold, and closing the mold after standing;
s4, after changing the magnetic field, carrying out adsorption distribution on the bubble-eliminating net rods 1 on the upper and lower surfaces of the die, and carrying out auxiliary elimination on bubbles in the raw materials in the migration process;
and S5, heating the mould, triggering the splitting action of the defoaming knot net rods 1, combining the defoaming knot net rods 1 with the adjacent defoaming knot net rods to form a net, and demoulding and taking out the formed concrete.
The composite early strength agent is prepared by mixing sodium chloride and anhydrous sodium sulphate according to the mass ratio of 1: 1.2.
The remainder was in accordance with example 1.
The invention can introduce the defoaming knot net rods 1 after concrete pouring innovatively, and uniformly distribute the defoaming knot net rods 1 through a uniform magnetic field before solidification, then force the defoaming knot net rods 1 to move from the concrete to the surfaces of two sides by changing the magnetic field, and effectively eliminate bubbles in the concrete in the migration process, thereby improving the compactness of the formed concrete and greatly improving the defect of air holes, after the defoaming knot net rods 1 migrate to the surface of the concrete, the breaking action of the defoaming knot net rods 1 is triggered in a heating mode, so that the defoaming knot net rods 1 are contacted with the adjacent defoaming knot net rods 1 and combined into a net, a high-strength connecting surface is formed through melting and resolidification of the phase change nodes 2, a net-shaped reinforcing structure is formed on the surface of the concrete, and a shrinkage force is triggered when the temperature drops, thereby effectively shrinking the surface of the concrete and preventing the surface of the concrete from water seepage and cracking, effectively improving the forming strength and compactness of the concrete.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. A processing method of a high-compactness concrete precast slab capable of preventing surface cracking is characterized by comprising the following steps of: the method comprises the following steps:
s1, weighing and uniformly mixing the raw materials, wherein the raw materials comprise the following components in parts by weight: 270 parts of Portland cement 265-containing materials, 170 parts of water 165-containing materials, 730 parts of fine sand 725-containing materials, 1050 parts of gravel 1000-containing materials, 75-85 parts of mineral powder, 75-80 parts of fly ash, 10-20 parts of polycarboxylic acid water reducing agent, 5-10 parts of composite early strength agent and 2-5 parts of defoaming agent;
s2, brushing a layer of mold release oil in the precast slab mold, pouring the mixed raw materials into the mold, and uniformly vibrating for 10-30S;
s3, uniformly throwing defoaming and knotting net rods (1) into the mold, applying a uniform magnetic field to force the defoaming and knotting net rods (1) to be uniformly distributed in the mold, and closing the mold after standing;
s4, after changing the magnetic field, carrying out adsorption distribution on the bubble-eliminating net rods (1) on the upper and lower surfaces of the die, and carrying out auxiliary elimination on bubbles in the raw materials in the migration process;
and S5, heating the mould, triggering the splitting action of the defoaming knot net rods (1), combining the defoaming knot net rods with the adjacent defoaming knot net rods (1) to form a net, and demoulding and taking out the formed concrete.
2. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 1, characterized in that: the composite early strength agent is prepared by mixing sodium chloride and anhydrous sodium sulphate according to the mass ratio of 1: 0.8-1.2.
3. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 1, characterized in that: defoaming knot net stick (1) is including basic post (11) and a plurality of division strip (12) and magnetism knot flap (13) that connect gradually, division strip (12) and magnetism knot flap (13) correspond and connect.
4. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 3, characterized in that: the magnetic net valve is characterized in that the inner end of the magnetic net valve (13) is connected with an embedded magnetic block (6) in an embedded mode, and one end, close to each other, of the embedded magnetic block (6) is wrapped with a magnetic isolation sleeve (7).
5. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 3, characterized in that: magnetism knot lamella (13) outer end is connected with a plurality of evenly distributed's phase transition node (2), inlay on phase transition node (2) and be connected with the defoaming and help even tow (3), and the defoaming helps even tow (3) to run through phase transition node (2) and be connected with magnetism knot lamella (13).
6. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 3, characterized in that: the split bar is characterized in that a thermal expansion division guiding ball (5) is connected between the joint of the split bar (12) and the base column (11), one end, far away from the base column (11), of the thermal expansion division guiding ball (5) is connected with a heat conducting wire (4), and the heat conducting wire (4) penetrates through the magnetic net claying clack (13) and extends to the outer side.
7. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 5, characterized in that: the phase change node (2) is made of a low-melting-point alloy material mixed with magnetic nano powder, and the defoaming connection-assisting fiber bundle (3) is formed by bundling magnetic fibers.
8. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 3, characterized in that: the foundation column (11) is made of a high-hardness metal material, the splitting strips (12) are made of a high-elasticity alloy material, and the magnetic net petals (13) are made of a heat-conducting metal material.
9. The method for processing the high-compactness concrete precast slab with the surface crack prevention function according to claim 1, characterized in that: in the step S5, the heating is performed in a high-temperature steam curing mode, and the heating temperature is higher than the melting point of the phase change node (2).
10. The method for processing the precast concrete slab with high compactness and surface crack resistance according to claim 9, wherein the method comprises the following steps: and in the step S5, when steam curing conditions are not provided, demoulding is carried out when the concrete is solidified, then a layer of plastic film is covered on the surface of the concrete, watering is carried out once every 2-4 hours in the daytime and once every 4-6 hours at night, and the curing time is 7-10 days.
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Cited By (1)
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| CN113005925A (en) * | 2021-03-30 | 2021-06-22 | 何怡 | Method for repairing crack of concrete bridge deck of bridge |
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