CN112028563A - Preparation method of C40 inorganic coating anti-freezing concrete and method for spraying coating - Google Patents
Preparation method of C40 inorganic coating anti-freezing concrete and method for spraying coating Download PDFInfo
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- CN112028563A CN112028563A CN202010703881.9A CN202010703881A CN112028563A CN 112028563 A CN112028563 A CN 112028563A CN 202010703881 A CN202010703881 A CN 202010703881A CN 112028563 A CN112028563 A CN 112028563A
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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
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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
- 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 of C40 inorganic coating anti-freezing concrete and a method for spraying a coating thereof, belonging 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, 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 C40 inorganic coating antifreeze concrete used in alpine regions and a preparation method thereof.
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 method for spraying the coating thereof, wherein the inorganic coating and the outer coating 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 water reducing agent into a forced stirrer, stirring for 5min, adding an additive, stirring for 2min, and solidifying to obtain a concrete test piece;
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 a high penetration enhancing sealant with XT-HPS.
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 method for spraying a C40 inorganic coating antifreeze concrete coating 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) wetting the concrete surface by using a pneumatic watering can filled with clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant on the whole concrete surface once when the surface layer cannot be exposed to the clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant again after the surface layer is dried in the air for 2-10 minutes, and drying the sealant to obtain the concrete.
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 XT-HPS high penetration enhancement sealant (composite type) (hereinafter referred to as XT-HPS composite 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.
The concrete surface is moistened by using a pneumatic watering can filled with clear water, attention is paid to the fact that no clear water exists on the surface, the XT-HPS environment-friendly high-permeability reinforcing sealant is sprayed on the whole concrete surface for one time, and after the surface layer is dried in the air for a few minutes, the XT-HPS environment-friendly high-permeability reinforcing sealant is sprayed again. The XT-HPS environment-friendly high-permeability reinforced sealant can improve the overall bonding strength of concrete, can block crack expansion and water intrusion in the concrete freeze-thawing process, and prevents concrete 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.
The surfaces of the sand and the stone are rubbed with each other to form a new section, and the section is easy to mix with the slurry and has 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-HPS environment-friendly high-permeability reinforced sealant is uniformly sprayed on the surface of 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-HPS environment-friendly high-permeability reinforced sealant is 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 performances of the concrete are 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 C40 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 water reducing agent into a forced stirrer, stirring for 5min, adding an additive, stirring for 2min, and solidifying to obtain a concrete test piece;
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 a high penetration enhancing sealant with XT-HPS.
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 method for spraying a C40 inorganic coating antifreeze concrete coating 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) wetting the concrete surface by using a pneumatic watering can filled with clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant on the whole concrete surface once when the surface layer cannot be exposed to the clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant again after the surface layer is dried in the air for 2-10 minutes, and drying the sealant to obtain the concrete.
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-HPS environment-friendly high-permeability reinforced sealant | — |
| Water reducing agent | Polycarboxylic acid water reducing agent |
A method for preparing C40 inorganic coating antifreeze concrete, comprising 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-HPS environment-friendly high-permeability reinforcing sealant.
The XT-HPS environment-friendly high-permeability reinforced sealant 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, wetting the surface of the concrete by using a pneumatic watering can filled with clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant on the whole surface of the concrete after paying attention to the fact that the surface cannot contain clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant on the whole surface of the concrete after 5 minutes, drying the surface layer in the air, and drying the surface layer in the air to obtain the XT-HPS environment-friendly high-permeability reinforced sealant.
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 C40 inorganic coating anti-freeze concrete prepared by the mixture ratio is carried out according to the rapid 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 freezing resistance test of the C40 inorganic coating concrete is 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 C40 inorganic coating antifreeze 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, 47.08GPa and 10.0213kg 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 respectively 120.00%, 101.66% and 0.05%, and the compressive strength and the dynamic elastic modulus are increased, which shows that the concrete with the mixing ratio has good frost resistance by 300 times of freeze thawing circulation, the hydration reaction of the concrete is promoted to increase the strength, the mass loss rate is far lower than 5%, the national standard of the test method for the long-term durability and the durability of common concrete (GBJ82-85) is reached, meanwhile, the mass loss rate of the concrete is extremely low due to the internal blending surface spraying of the inorganic coating, the compressive strength is far higher than the standard of C40 concrete, no crack is generated on the surface of the concrete after 300 times of freeze thawing circulation, 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 (7)
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 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;
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.
2. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: 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.
3. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the coating is a high penetration enhancing sealant with XT-HPS.
4. 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.
5. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: the sand uses natural medium sand in the II area.
6. The method for preparing the C40 inorganic coating antifreeze concrete of claim 1, wherein: and curing the concrete test piece in water.
7. A method for spraying a C40 inorganic coating antifreeze concrete coating 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) wetting the concrete surface by using a pneumatic watering can filled with clear water, spraying the XT-HPS environment-friendly high-permeability reinforced sealant on the whole concrete surface for 2-10 minutes, spraying the XT-HPS environment-friendly high-permeability reinforced sealant after the surface layer is dried, and drying to obtain the concrete.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425305A (en) * | 2011-12-28 | 2012-04-25 | 广州市恒盛建设工程有限公司 | Concrete penetration and sealing composite waterproof construction method |
| CN104058678A (en) * | 2013-04-15 | 2014-09-24 | 上海建工材料工程有限公司 | Highly-antifreezing highly-slump retaining self-compacting C40 concrete |
| CN108033744A (en) * | 2017-11-20 | 2018-05-15 | 马鞍山豹龙新型建材有限公司 | A kind of production method of the powder ash air-entrained concrete building block of surface spraying waterproofing agent |
| CN108623246A (en) * | 2017-03-24 | 2018-10-09 | 北京市小红门混凝土有限责任公司 | Frost-resistant concrete and preparation method thereof |
| CN109704664A (en) * | 2019-03-13 | 2019-05-03 | 北京琦正德科技有限责任公司 | A method of improving cured concrete antifreezing grade |
-
2020
- 2020-07-21 CN CN202010703881.9A patent/CN112028563A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425305A (en) * | 2011-12-28 | 2012-04-25 | 广州市恒盛建设工程有限公司 | Concrete penetration and sealing composite waterproof construction method |
| CN104058678A (en) * | 2013-04-15 | 2014-09-24 | 上海建工材料工程有限公司 | Highly-antifreezing highly-slump retaining self-compacting C40 concrete |
| CN108623246A (en) * | 2017-03-24 | 2018-10-09 | 北京市小红门混凝土有限责任公司 | Frost-resistant concrete and preparation method thereof |
| CN108033744A (en) * | 2017-11-20 | 2018-05-15 | 马鞍山豹龙新型建材有限公司 | A kind of production method of the powder ash air-entrained concrete building block of surface spraying waterproofing agent |
| CN109704664A (en) * | 2019-03-13 | 2019-05-03 | 北京琦正德科技有限责任公司 | A method of improving cured concrete antifreezing grade |
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Application publication date: 20201204 |