CN112028561A - Preparation method and surface spraying process of C40 inorganic coating anti-freeze concrete - Google Patents
Preparation method and surface spraying process of C40 inorganic coating anti-freeze concrete Download PDFInfo
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- CN112028561A CN112028561A CN202010702560.7A CN202010702560A CN112028561A CN 112028561 A CN112028561 A CN 112028561A CN 202010702560 A CN202010702560 A CN 202010702560A CN 112028561 A CN112028561 A CN 112028561A
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- C—CHEMISTRY; METALLURGY
- 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
- 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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- C—CHEMISTRY; METALLURGY
- 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
- 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
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
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- C—CHEMISTRY; METALLURGY
- 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
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/70—Coating or impregnation for obtaining at least two superposed coatings having different compositions
-
- C—CHEMISTRY; METALLURGY
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Aftertreatments Of Artificial And Natural Stones (AREA)
Abstract
The invention discloses a preparation method and a surface spraying process of C40 inorganic coating anti-freeze concrete, and belongs to the technical field of concrete. Pre-homogenizing sand and stones in respective raw material bins; placing the pre-homogenized sand and gravel in a forced stirrer to stir for 2 min; adding cement and a water reducing agent into a forced stirrer, stirring for 5min, adding an additive and water, stirring for 2min, and solidifying to obtain a concrete test piece; curing the concrete sample for 28 days, and spraying a coating to obtain C40 inorganic coating anti-freezing concrete; the weight portion ratio of the cement to the sand to the stones to the admixture to the water is 400-450: 750-800: 950-1000: 4-5: 150-200. The invention has simple formula and good freezing resistance and durability, and is suitable for various engineering projects in alpine regions.
Description
Technical Field
The invention relates to a preparation method and a surface spraying process of C40 inorganic coating anti-freezing concrete used in alpine regions.
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
The invention aims to provide a preparation method of C40 inorganic coating antifreeze concrete and a surface spraying process thereof, wherein an inorganic coating and an external inorganic coating are added to improve the waterproof and bonding properties of the concrete, thereby improving the antifreeze durability of the concrete.
The above object of the present invention is achieved by the following technical solutions: a preparation method of C40 inorganic coating antifreeze concrete comprises the following steps:
1) pre-homogenizing sand and stones in respective raw material bins;
2) placing the pre-homogenized sand and gravel in a forced stirrer to stir for 2 min;
3) adding cement and a polycarboxylic acid water reducing agent into a forced stirrer, stirring for 5min, adding an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent and water, stirring for 2min, and solidifying to obtain a concrete sample;
4) curing the concrete sample for 28 days, and spraying a coating to obtain C40 inorganic coating anti-freezing concrete; the weight portion ratio of the cement to the sand to the stones to the admixture to the water is 400-450: 750-800: 950-1000: 4-5: 150-200.
The additive consists of 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.
The coating is XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and XT-SS environment-friendly surface sealing agent.
The stones are continuously graded with a particle size of 5-25 mm.
The sand uses natural medium sand in the II area.
And curing the concrete test piece in water.
A surface spraying process of C40 inorganic coating anti-freeze concrete comprises the following steps:
1) taking out the concrete test block and the test piece from the water, cleaning impurities on the surface of the concrete test block and the test piece, and naturally airing the concrete test block and the test piece 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 then 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.
The additive comprises an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent (permeable type) (hereinafter referred to as XT-HPA permeable type) and a polycarboxylic acid water reducing agent in a weight ratio of 1: 1; the external coating adopts an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent (permeable type) (hereinafter referred to as XT-HPA permeable type) and an XT-SS environment-friendly surface sealing agent (sealing type) (hereinafter referred to as XT-SS sealing type).
The sand and the stones are used as basic lapping frameworks of the concrete, the quantity of the stones is larger, and the sand is filled in gaps among the stones and forms the basic lapping frameworks of the concrete together with the stones. Cement and a water reducing agent are dissolved in water to form viscous slurry, and the slurry is wrapped on the outside of the lap joint frameworks to enhance the bonding effect between the lap joint 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.
The additive comprises XT-HPA permeable 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.
The additive comprises XT-HPA permeable type and polycarboxylic acid water reducing agent in a weight ratio of 1: 1.
And taking out the concrete from water, cleaning impurities on the surface of the concrete, naturally airing the concrete for 24 hours, wetting the surface of the concrete by using a pneumatic spraying pot filled with clear water, spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface after paying attention to the fact that the surface cannot contain clear water, and spraying the XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent after the surface layer is aired for a few minutes. 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.
The continuous graded stones with the size of 5-25mm 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 layers 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.
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.
After the sand and the stones are pre-homogenized, the surfaces of the sand and the stones are rubbed with each other to form new sections, and the new sections are easily mixed with the slurry and have strong adhesion.
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 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.
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.
In conclusion, 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.
Detailed Description
A preparation method of C40 inorganic coating antifreeze concrete comprises the following steps:
1) pre-homogenizing sand and stones in respective raw material bins;
2) placing the pre-homogenized sand and gravel in a forced stirrer to stir for 2 min;
3) adding cement and a polycarboxylic acid water reducing agent into a forced stirrer, stirring for 5min, adding an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent and water, stirring for 2min, and solidifying to obtain a concrete sample;
4) curing the concrete sample for 28 days, and spraying a coating to obtain C40 inorganic coating anti-freezing concrete; the weight portion ratio of the cement to the sand to the pebbles to the admixture to the water is 440: 785: 999: 4.4: 176.
the additive consists of 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.
The coating is XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and XT-SS environment-friendly surface sealing agent.
The stones are continuously graded with a particle size of 5-25 mm.
The sand uses natural medium sand in the II area.
And curing the concrete test piece in water.
A surface spraying process of C40 inorganic coating anti-freeze concrete comprises the following steps:
1) taking out the concrete test block and the test piece from the water, cleaning impurities on the surface of the concrete test block and the test piece, and naturally airing the concrete test block and the test piece 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 then 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 present invention is described in further detail below with reference to fig. 1.
The raw materials according to the present invention are all commercially available, and specific specifications are shown in table 1.
TABLE 1 Specifications of raw materials used in the examples
| Components | Specification of |
| Cement | 42.5 grade ordinary portland cement |
| Sand | Natural medium sand in zone II |
| Stone | Crushed stone of 5-25mm |
| XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent | — |
| XT-SS environment-friendly surface sealant | — |
| Water reducing agent | Polycarboxylic acid water reducing agent |
A preparation method of C40 inorganic coating antifreeze concrete and a surface spraying process thereof 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: 440kg of cement and 2.2kg of water reducing agent are added into a forced stirrer to be stirred for 5min, and then 2.2kgXT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent is added to be stirred 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 5 minutes, and then spraying again after the surface layer is dried;
and S3, cleaning the surface by using clean water after 24 hours, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried after 5 minutes.
The admixture comprises the following components in percentage by weight: 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 56.663MPa, 44.52GPa and 9.7733kg respectively, and the concrete can bear enough strength. After 300 times of cyclic freeze thawing, the freeze resistance coefficient, the relative dynamic elastic modulus and the mass loss rate are 115.71%, 104.56% and-0.05% respectively, the compressive strength, the dynamic elastic modulus and the mass are increased, which shows that the concrete with the mixing ratio has good frost resistance by 300 times of freeze thawing cycles, the hydration reaction of the concrete is promoted to increase the strength, and the national standard of testing method of long-term durability and durability of common concrete (GBJ82-85) is reached, meanwhile, the compressive strength of the concrete is far higher than the standard of C40 concrete due to the spraying of the inner surface of the inorganic coating, no crack is generated on the surface of the concrete after 300 times of freeze thawing cycles, the strength is reduced slightly, and the concrete has good frost 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.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (6)
1. A preparation method of C40 inorganic coating antifreeze concrete is characterized by comprising the following steps:
1) pre-homogenizing sand and stones in respective raw material bins;
2) placing the pre-homogenized sand and gravel in a forced stirrer to stir for 2 min;
3) adding cement and a polycarboxylic acid water reducing agent into a forced stirrer, stirring for 5min, adding an XT-HPA environment-friendly high-permeability inorganic crystalline waterproof agent and water, stirring for 2min, and solidifying to obtain a concrete sample;
4) curing the concrete sample for 28 days, and spraying a coating to obtain C40 inorganic coating anti-freezing concrete; 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 weight portion ratio of the cement to the sand to the stones to the admixture to the water is 400-450: 750-800: 950-1000: 4-5: 150-200.
2. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the coating is XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent and XT-SS environment-friendly surface sealing agent.
3. 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.
4. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the sand uses natural medium sand in the II area.
5. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: and curing the concrete test piece in water.
6. A surface spraying process of C40 inorganic coating anti-freeze concrete is characterized by comprising the following steps:
1) taking out the concrete sample from the water, cleaning impurities on the surface of the concrete sample, and naturally airing the concrete sample for 24 hours;
2) spraying an XT-HPA environment-friendly high-permeability inorganic crystalline waterproofing agent on the whole concrete surface for 2-10min, and spraying again after the surface layer is dried;
3) and after 24 hours, cleaning the surface by using clean water, performing 2-10min, and spraying XT-SS environment-friendly surface sealant once after the surface layer is dried.
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