CN112047672A - Preparation method and spraying process of C40 inorganic coating anti-freezing concrete - Google Patents
Preparation method and spraying process of C40 inorganic coating anti-freezing concrete Download PDFInfo
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
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- C—CHEMISTRY; METALLURGY
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/62—Coating or impregnation with organic materials
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01—MEASURING; TESTING
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a preparation method and a spraying process of C40 inorganic coating antifreeze concrete. Pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min; placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min; mixing, adding cement, fly ash, polycarboxylic acid water reducer and water, stirring for 5min, adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent, and stirring for 2min at a stirring speed of 3-6r/min to obtain a concrete test block; and curing the concrete test block in water for 28 days, and spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and an XT-SS environment-friendly surface sealing agent. The invention adds the inorganic coating and the external inorganic coating, improves the waterproof and bonding performance of the concrete, and improves the frost resistance and durability of the concrete.
Description
Technical Field
The invention relates to a preparation method and a spraying process of C40 inorganic coating anti-freezing concrete, belonging to the technical field of concrete.
Background
Most areas in China belong to severe cold regions, and the requirement on the frost resistance of buildings is high. Under the conditions of severe cold and extreme temperature difference, the internal and external contraction of the conventional concrete is inconsistent, so that the internal stress of the concrete is increased, and cracks are generated.
In order to improve the frost resistance of concrete, an inorganic coating is usually added to the concrete, and the bonding property and the waterproof property of the concrete are enhanced depending on the performance of the inorganic coating. However, in the later stage of concrete curing, fine cracks still can be generated inside concrete due to large temperature difference between the inside and the outside in severe cold areas, and the internal cracks gradually increase along with continuous freezing and melting, so that the strength of the whole concrete construction building is influenced.
Disclosure of Invention
In view of the above, the invention provides a preparation method and a spraying process of C40 inorganic coating antifreeze concrete, wherein the inorganic coating and the external inorganic coating are added to improve the waterproof and bonding properties of the concrete, thereby improving the antifreeze durability of the concrete.
The invention solves the technical problems by the following technical means:
the invention relates to a preparation method of C40 inorganic coating antifreeze concrete, which comprises the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) mixing, adding cement, fly ash, polycarboxylic acid water reducer and water, stirring for 5min, adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent, and stirring for 2min at a stirring speed of 3-6r/min to obtain a concrete test block;
4) and curing the concrete test block in water for 28 days, and spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and an XT-SS environment-friendly surface sealing agent.
An XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1:1 form an additive.
The cement, the fly ash, the sand, the stones, the additive and the water are mixed in parts by weight of 350-400: 40-45: 750-800: 950-1000: 4-4.5: 150-200.
The XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and the XT-SS environment-friendly surface sealant form an outer coating.
The stones are continuously graded with a particle size of 5-25 mm.
The sand uses natural medium sand in the II area.
Class F class I fly ash is used as fly ash.
A spraying process of C40 inorganic coating anti-freeze concrete comprises the following steps:
1) taking out the concrete test block from the water, cleaning impurities on the surface and naturally airing for 24 hours;
2) spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface for 2-10 minutes, and spraying again after the surface layer is dried;
3) and after 24 hours, cleaning the surface by using clean water, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried after 2-10 minutes.
By adopting the technical scheme, the sand and the stones are used as basic lapping frameworks of the concrete, the quantity of the stones is large, and the sand is filled in gaps among the stones and forms the basic lapping frameworks of the concrete with the stones. After the cement and the fly ash are dissolved in water, viscous slurry is formed, and the slurry is wrapped outside the lapping frameworks to enhance the bonding effect between the lapping frameworks, so that the strength of the concrete basic framework is improved. The XT-HPA is added into concrete to raise the adhesion and prevent concrete shrinkage crack.
In addition, the admixture comprises XT-HPA penetration type and polycarboxylic acid water reducing agent. The XT-HPA penetration type can improve the bonding property between the concrete lap joint framework and the slurry, and the polycarboxylic acid water reducing agent added into the concrete can further reduce the water consumption and increase the bonding strength between the lap joint frameworks.
Further, the admixture comprises XT-HPA permeable water reducing agent and polycarboxylic acid water reducing agent in a weight ratio of 1: 1.
By adopting the technical scheme, after the surface impurities are taken out from water and cleaned and naturally dried for 24 hours, the concrete surface is wetted by using a pneumatic watering can filled with clear water, the surface can not be exposed to bright water, the XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent is sprayed on the whole concrete surface, and the surface layer is dried in the air after a few minutes and then sprayed again. And after 24 hours, cleaning the surface by using clean water, and spraying the XT-SS environment-friendly surface sealant once after the surface layer is dried in the air for a few minutes. The XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and the XT-SS environment-friendly surface sealant can improve the overall bonding strength of concrete, can block crack expansion and water intrusion in the freeze-thaw process of the concrete, and prevent the concrete from segregation and delamination.
By adopting the technical scheme, the stones with 5-25mm continuous gradation are used as basic lapping frameworks, the sizes of the stones are different, the stones with smaller particles are filled among the stones with larger particle sizes, and the concrete frameworks with different lapping levels are integrally formed. The natural medium sand in the area II has smaller grain diameter and is filled in gaps among stones, so that the strength of the lapped framework is further enhanced. The F class I fly ash has low hydration heat and contains a large amount of active silica and alumina, so that the cement is more fully hydrated. In addition, the active silica and the alumina have smaller particle sizes and are filled among cement particles, so that the compactness of concrete can be improved.
Through multiple experiments, the concrete prepared by using the proportion has good compression resistance, and the strength loss is small after multiple freeze-thaw cycles.
Further, a preparation method and a spraying process of the C40 inorganic coating antifreeze concrete comprise the following steps:
the method comprises the following steps: introducing sand and pebbles into respective raw material bins for pre-homogenization;
step two: stirring the sand and the stones in a forced stirrer for 2 min;
step three: adding cement, fly ash and a water reducing agent into a forced stirrer, stirring for 5min, adding an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent, and stirring for 2 min;
step four: concrete test pieces and test blocks are maintained in water for 28 days, and XT-HPA environment-friendly high-permeability inorganic crystal waterproof agent (permeable type) (hereinafter referred to as XT-HPA permeable type) and XT-SS environment-friendly surface sealant (sealed type) (hereinafter referred to as XT-SS sealed type) are sprayed.
By adopting the technical scheme, after the sand and the stones are pre-homogenized, the surfaces of the sand and the stones are mutually rubbed to form a new tangent plane, so that the sand and the stones are easily mixed with the slurry, and the adhesion is strong.
When the concrete is prepared, sand and stones for constructing the concrete framework are uniformly stirred in advance, and then the sand and the stones are mixed with cement, fly ash and a water reducing agent to form a uniformly dispersed concrete system. And then, an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent is added and stirred, and the slurry, the sand and the stones are bonded by an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent solution, so that the coating is tighter.
By adopting the spraying technical scheme of the invention, the XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and the XT-SS environment-friendly surface sealant are uniformly sprayed on the surface of the concrete, so that an inorganic waterproof layer is formed on the surface of the concrete, and the bonding and waterproof effects are better.
The invention has the following beneficial effects:
1. the continuous graded stones and sands are mutually filled and overlapped to form a stable concrete framework, so that the compressive strength of the concrete is increased.
2. The XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent is added into the concrete, so that the bonding effect between the basic lap joint framework of the concrete and the gel substance is improved.
3. The XT-HPA environment-friendly high-permeability inorganic crystal waterproof agent and the XT-SS environment-friendly surface sealant are sprayed on the surface of the concrete, so that an inorganic waterproof layer is formed on the surface of the concrete, and the bonding and waterproof performance of the concrete is improved.
4. The water reducing agent is a polycarboxylic acid water reducing agent, so that the bonding strength of the lap joint framework and the gel substance in the concrete is further improved.
Drawings
FIG. 1 is a flow chart of the preparation process of the inorganic coating antifreeze concrete of the invention.
Detailed Description
A preparation method of C40 inorganic coating antifreeze concrete comprises the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) mixing, adding cement, fly ash, polycarboxylic acid water reducer and water, stirring for 5min, adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent, and stirring for 2min at a stirring speed of 3-6r/min to obtain a concrete test block;
4) and curing the concrete test block in water for 28 days, and spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and an XT-SS environment-friendly surface sealing agent.
An XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1:1 form an additive.
The cement, the fly ash, the sand, the stones, the additive and the water are mixed in parts by weight of 350-400: 40-45: 750-800: 950-1000: 4-4.5: 150-200.
The XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and the XT-SS environment-friendly surface sealant form an outer coating.
The stones are continuously graded with a particle size of 5-25 mm.
The sand uses natural medium sand in the II area.
Class F class I fly ash is used as fly ash.
A spraying process of C40 inorganic coating anti-freeze concrete comprises the following steps:
1) taking out the concrete test block from the water, cleaning impurities on the surface and naturally airing for 24 hours;
2) spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface for 2-10 minutes, and spraying again after the surface layer is dried;
3) and after 24 hours, cleaning the surface by using clean water, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried after 2-10 minutes.
Example 1
The invention will be described in detail below with reference to the accompanying figure 1 and specific examples: the invention is further described in detail with reference to fig. 1, in the following, a preparation method and a spraying process of the C40 inorganic coating antifreeze concrete of this embodiment.
The raw materials related to the invention are all commercially available, and the specific specifications and manufacturers are shown in table 1.
TABLE 1 Specifications of raw materials used in the examples
A preparation method and a spraying process of C40 inorganic coating antifreeze concrete comprise the following steps:
the method comprises the following steps: 785kg of sand and 999kg of pebbles are introduced into respective raw material bins for pre-homogenization;
step two: 785kg of sand and 999kg of stones are put in a forced stirrer to be stirred for 2 min;
step three: adding 396kg of cement, 44kg of fly ash and 2.2kg of water reducing agent into a forced stirrer, stirring for 5min, adding 2.2kgXT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent, and stirring for 2 min;
step four: and curing the concrete test piece and the test block in water for 28 days, and spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and an XT-SS environment-friendly surface sealing agent.
The XT-HPA penetration type and XT-SS sealing type spraying method comprises the following steps:
s1, taking out the concrete test block and the test piece from the water, cleaning the surface impurities and naturally airing for 24 hours;
s2, spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface for a plurality of minutes, and spraying again after the surface layer is dried;
and S3, cleaning the surface by using clear water after 24 hours, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried in the air after a few minutes.
Wherein the admixture comprises the following components in percentage by weight of 1:1 XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and polycarboxylic acid water reducing agent.
The freeze-thaw cycle test of the inorganic coating anti-freezing concrete prepared by the mixture ratio is carried out according to the fast freeze-thaw test regulation in the test method for the long-term durability and the durability of common concrete (GBJ82-85), and the dynamic elastic modulus and the quality of the test are tested; the compressive strength is in accordance with GB/T50081-2002 Standard of mechanical Properties test methods of ordinary concrete.
The frost resistance of the inorganic coating concrete is tested as follows: placing the concrete test block and the test piece which are maintained in the water saturation state for 28 days into a rubber barrel, placing the rubber barrel into a rapid freeze-thaw circulating machine for freeze-thaw circulating test, wherein the water surface is 2cm higher than that of the concrete test block and the test block, the concrete test block and the test block are in the water saturation state in the freeze-thaw process, and the compression strength, the dynamic elastic modulus and the quality are tested every 50 times of freeze-thaw circulation. The freezing resistance coefficient, the relative dynamic elastic modulus and the mass loss are respectively obtained for 300 times, and the three types of test data are specifically shown in table 2.
Table 2 shows three types of test data of the inorganic coating anti-freeze concrete
From the above data, the initial compressive strength, the dynamic elastic modulus and the mass of the concrete prepared by the above formulation are 68.15MPa, 47.78GPa and 9.8313kg respectively, and the concrete can bear enough strength. After 300 times of circulating freeze thawing, the freeze resistance coefficient, the relative dynamic elastic modulus and the mass loss rate are 85.21%, 99.69% and 1.21% respectively, wherein the relative dynamic elastic modulus is far higher than 60%, and the mass loss rate is far lower than 5%, so that the national standard of testing method of long-term durability and durability of common concrete (GBJ82-85) is met, meanwhile, the mass loss rate of the concrete is extremely low due to the spraying of the inner blending surface of the inorganic coating, the compressive strength is far higher than that of C40 concrete, no crack is generated on the surface of the concrete after 300 times of the freeze thawing cycle, the strength is reduced slightly, and the concrete has good freeze resistance.
The admixture uses an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1:1, so that the using amount of water in concrete is reduced, and the viscosity of the slurry is increased. The bonding between the lapping skeleton formed by the sand and the stones and the slurry is firmer under the action of an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent, so that the frost resistance of the concrete is improved.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. A preparation method of C40 inorganic coating antifreeze concrete is characterized by comprising the following steps:
1) pouring sand and pebbles into respective raw material bins for pre-homogenization, wherein the pre-homogenization time is 5-10min, and the stirring speed is 5-10 r/min;
2) placing the pre-homogenized sand and gravel in a forced stirrer, and stirring at a speed of 3-6r/min for 2 min;
3) mixing, adding cement, fly ash, polycarboxylic acid water reducer and water, stirring for 5min, adding XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent, and stirring for 2min at a stirring speed of 3-6r/min to obtain a concrete test block;
4) and curing the concrete test block in water for 28 days, and spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and an XT-SS environment-friendly surface sealing agent.
2. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and a polycarboxylic acid water reducing agent in a weight ratio of 1:1 form an additive.
3. The method for preparing the C40 inorganic coating antifreeze concrete of claim 2, wherein: the cement, the fly ash, the sand, the stones, the additive and the water are mixed in parts by weight of 350-400: 40-45: 750-800: 950-1000: 4-4.5: 150-200.
4. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and the XT-SS environment-friendly surface sealant form an outer coating.
5. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the stones are continuously graded with a particle size of 5-25 mm.
6. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the sand uses natural medium sand in the II area.
7. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: class F class I fly ash is used as fly ash.
8. A spraying process of C40 inorganic coating anti-freeze concrete is characterized by comprising the following steps:
1) taking out the concrete test block from the water, cleaning impurities on the surface and naturally airing for 24 hours;
2) spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface for 2-10 minutes, and spraying again after the surface layer is dried;
3) and after 24 hours, cleaning the surface by using clean water, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried after 2-10 minutes.
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