CN112851240A - Winter fertilization micro-expansion concrete and preparation method thereof - Google Patents
Winter fertilization micro-expansion concrete and preparation method thereof Download PDFInfo
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- CN112851240A CN112851240A CN202110093986.1A CN202110093986A CN112851240A CN 112851240 A CN112851240 A CN 112851240A CN 202110093986 A CN202110093986 A CN 202110093986A CN 112851240 A CN112851240 A CN 112851240A
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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
- 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
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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
- 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
- C04B2111/29—Frost-thaw resistance
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- 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
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses winter application micro-expansion concrete and a preparation method thereof. A winter application micro-expansion concrete comprises water, cement, fly ash, machine-made sand, natural sand, broken stone, an anti-freezing agent and a composite additive; the composite additive comprises an expanding agent, calcium dodecyl benzene sulfonate and cetyl alcohol; the preparation method comprises the following steps: heating 25-35% of water to 40-45 ℃, and mixing the water with the composite additive and the antifreezing agent to obtain an aqueous solution of the additive; heating the residual amount of water to 75-85 ℃, and adding the aggregate; adding the rest raw materials and the water solution of the additive. The winter application micro-expansion concrete has the advantage of obviously improving the cracking resistance of the concrete in the low-temperature environment in winter.
Description
Technical Field
The application relates to the technical field of concrete, in particular to winter application micro-expansion concrete and a preparation method thereof.
Background
With the rapid development of economy, the construction industry of China is also rapidly developed, and the use amount of concrete is greatly increased. In the process of hydration and hardening of common reinforced concrete, concrete is shrunk to enable reinforcing steel bars in the structure to be subjected to compressive stress and concrete to be subjected to tensile stress, and the existing stress state in the structure enables the structure to be easy to crack.
At present, the method for solving the problem of concrete cracking is mainly to add a certain amount of expanding agent into common concrete to ensure that the concrete generates proper expansion and generates a certain chemical prestress under the conditions of reinforcing steel bars and other constraints, thereby compensating shrinkage and relieving cracked concrete.
However, in the low-temperature environment in winter in the north, the performance of the expanding agent is reduced after being frozen, excessive expanding agent is often required to be added into the concrete raw material to relieve the cracking of the concrete, but when the addition amount of the expanding agent is too large, the strength of the concrete is reduced, the strength of the concrete is not up to the standard, the service life of a concrete building is greatly shortened, and the maintenance cost of the concrete building is greatly increased.
Disclosure of Invention
In order to improve the crack resistance of concrete in a low-temperature environment in winter, the application provides winter application micro-expansion concrete and a preparation method thereof.
In a first aspect, the application provides a winter application micro-expansion concrete, which adopts the following technical scheme:
the winter micro-expansion concrete comprises, by weight, 162 parts of water 156-containing materials, 340 parts of cement 320-containing materials, 118 parts of fly ash 112-containing materials, 330 parts of machine-made sand 306-containing materials, 330 parts of natural sand 306-containing materials, 1147 parts of crushed stone 1103-containing materials, 9.2-9.8 parts of anti-freezing agents and 38-42 parts of composite additives; the composite additive comprises 16 (0.3-0.5) to 0.3-0.5 (by weight) of expanding agent, calcium dodecyl benzene sulfonate and cetyl alcohol.
By adopting the technical scheme, the freezing point of the concrete can be effectively reduced by doping the antifreezing agent, and the antifreezing performance of the concrete is improved; meanwhile, the swelling agent, the calcium dodecyl benzene sulfonate and the cetyl alcohol are doped, the reaction rate of the swelling agent and the calcium hydroxide in the cement paste can be cooperatively controlled, the speed of generating the ettringite swelling component is better matched with the self shrinkage rate of the concrete, and therefore the compactness of the concrete is improved, and the anti-cracking performance of the concrete in the low-temperature environment in winter is improved.
Preferably, the composite admixture further comprises sodium p-methoxy fatty amido benzene sulfonate and hydroxysuccinimide, wherein the weight ratio of the sodium p-methoxy fatty amido benzene sulfonate to the expanding agent is (0.1-0.3):16, and the weight ratio of the hydroxysuccinimide to the expanding agent is (0.1-0.3): 16.
By adopting the technical scheme, the limited expansion rate, the limited shrinkage rate and the freeze-thaw resistance of the concrete are less influenced by simultaneously doping the p-methoxy fatty amide benzene sulfonic acid sodium salt and the hydroxysuccinimide, but the compressive strength and the crack resistance of the concrete can be further improved.
Preferably, the antifreezing agent is an NRF-H104 type polycarboxylic acid type antifreezing agent.
By adopting the technical scheme, the NRF-H104 type polycarboxylic acid antifreezing agent integrates the functions of high-efficiency water reducing, cracking resistance, permeability resistance, freezing resistance, retarding, strengthening and plasticizing, has excellent comprehensive performance, and improves the durability of concrete.
Preferably, the swelling agent is a SY-G high-performance swelling agent.
By adopting the technical scheme, the SY-G high-performance expanding agent does not contain chloride ions and has no corrosion effect on the steel bar; the chemical erosion resistance is strong; no toxicity, no smell, no influence on water quality, and environmental protection.
Preferably, the cement is P042.5 Portland cement.
By adopting the technical scheme, the cement is relatively stable and has low hydration heat.
Preferably, the natural sand is zone II medium sand.
Preferably, the machine-made sand is zone II medium sand.
By adopting the technical scheme, the mineral admixture improves the microstructure and the hydration product composition inside the concrete, improves the blocking capability of the concrete to chloride ion transmission, has stronger curing capability to chloride ions due to the physical and chemical adsorption effect, is favorable for reducing the transmission speed of the chloride ions inside the concrete, and further improves the chloride ion permeation resistance of the concrete.
Preferably, the fly ash is type II fly ash.
By adopting the technical scheme, the fly ash mineral admixture has a plurality of comprehensive effects such as 'activity effect', 'interface effect', 'micro-filling effect' and 'water reducing effect'.
Preferably, the crushed stones are 5-25mm continuous graded crushed stones.
By adopting the technical scheme, the shrinkage of the concrete is reduced, and the durability of the structure is improved.
In a second aspect, the preparation method of the winter application micro-expansion concrete provided by the application adopts the following technical scheme:
a preparation method of winter fertilization micro-expansion concrete comprises the following steps:
(1) heating 25-35% of water to 35-45 ℃, adding the composite additive and the antifreezing agent, and stirring for 15-20 seconds to obtain an aqueous solution of the additive;
(2) heating the residual amount of water to 75-85 ℃, adding broken stone, natural sand and machine-made sand, stirring for 1-2min to uniformly mix and completely wet the aggregate, and cooling to 30-35 ℃ to prepare a first slurry;
(3) mixing the first slurry obtained in the step (2) with cement and fly ash, and stirring for 40-50 seconds to obtain a second slurry;
(4) and (4) mixing the aqueous solution of the additive and the second slurry obtained in the step (3), and stirring for 1-2min to obtain the winter application micro-expansion concrete.
By adopting the technical scheme, 25-35% of water is heated to 35-45 ℃, the composite additive and the antifreezing agent are added into the water to prepare the additive aqueous solution, the heating of the water temperature is favorable for the rapid dissolution of the composite additive in cold environments in winter, the dispersibility of the composite additive and the antifreezing agent in concrete is improved, and the self-action is fully exerted;
mixing the broken stone, the natural sand and the machine-made sand with the residual amount of water at the temperature of 75-85 ℃ to prepare first slurry; the self temperature of the broken stone and the natural sand is improved, the broken stone and the frozen blocks in the natural sand are dissolved, and the frozen blocks are prevented from influencing the compactness of the concrete. After the aggregate is fully wetted, the aggregate is more easily combined with the gel material;
cooling to 30-35 ℃, mixing and stirring the first slurry, cement and fly ash for 40-50 seconds to fully combine the aggregate and the gel material to prepare a second slurry; when the temperature is too high, the slump loss of the concrete is large, and when the temperature is lower, the concrete transportation distance is short in a low-temperature environment in winter;
and finally, mixing the aqueous solution of the additive with the second slurry, thereby not only improving the dispersibility of the composite additive in concrete, but also ensuring that the fusion of various raw materials is more uniform.
In summary, the present application has the following beneficial effects:
1. the antifreeze agent is added, so that the freezing point of the concrete can be effectively reduced, and the frost resistance of the concrete is improved; meanwhile, the swelling agent, the calcium dodecyl benzene sulfonate and the cetyl alcohol are doped, the reaction rate of the swelling agent and the calcium hydroxide in the cement paste can be cooperatively controlled, the speed of generating the ettringite swelling component is better matched with the self shrinkage rate of the concrete, and therefore the compactness of the concrete is improved, and the anti-cracking performance of the concrete in the low-temperature environment in winter is improved.
2. Meanwhile, the limited expansion rate, the limited dry shrinkage rate and the freeze-thaw resistance of the concrete are less influenced by the incorporation of the p-methoxy fatty acid amide sodium benzenesulfonate and the hydroxysuccinimide, but the compressive strength and the crack resistance of the concrete can be further improved.
3. The broken stones are 5-25mm continuous graded broken stones, so that the shrinkage of concrete is reduced, and the durability of the structure is improved.
Detailed Description
The present application will be described in further detail with reference to examples.
TABLE 1 sources of raw materials
TABLE 2 ingredient tables (unit: kg) of a winter micro-expansive concrete provided in examples 1 to 8
TABLE 3 ingredient table (unit: Kg) of a winter concrete for micro-expansion in winter provided in comparative examples 1 to 10
The micro-expansive concrete for winter season provided by the above examples and comparative examples is prepared by the following preparation method.
The preparation method of the winter fertilization micro-expansion concrete comprises the following steps:
(1) heating 30 percent of water to 40 ℃, adding the composite additive and the antifreezing agent into the water, and stirring for 15-20 seconds to obtain an aqueous solution of the additive;
(2) heating the rest of the raw materials to 80 ℃ by using 70% of water, adding broken stone, natural sand and machine-made sand, stirring for 1-2min to uniformly mix and completely wet the aggregate, and cooling to 35 ℃ to prepare first slurry;
(3) adding cement and fly ash into the first slurry, and stirring for 40-50 seconds to prepare a second slurry;
(4) and mixing the aqueous solution of the additive and the second slurry, and stirring for 1-2min to obtain the winter application micro-expansion concrete.
The above examples and comparative examples were subjected to various property tests, and the test results are shown in Table 4.
The performances of the expansion limiting rate and the dry shrinkage limiting rate are carried out according to GB50119-2013 technical Specification for concrete admixture application, and the expansion limiting rate of a concrete sample in water is 3d, 7d and 14d, and the dry shrinkage limiting rate of the concrete sample in water is 14d and in air is 28d are respectively tested.
The compressive strength is carried out according to GB/T50081-2016 standard of mechanical property test method for common concrete, and the 28d compressive strength of the concrete sample is measured.
The early crack resistance is carried out according to GB/T50081-2016 standard of mechanical property test method for common concrete, and the number of cracks in unit area and the total crack area in unit area are measured after concrete is poured for 24 hours.
The freeze-thaw resistance is carried out according to SL352-2018 'test procedure for hydraulic concrete', and the mass loss rate of the concrete sample is calculated after 300 times of anti-freezing circulation at-30 to 30 ℃.
TABLE 4 examination results of the expansion limiting ratio and the shrinkage limiting ratio of the concrete in examples 1 to 8 and comparative examples 1 to 10
TABLE 5 test results of compressive strength, early crack resistance, and freeze-thaw resistance of the concretes of examples 1 to 8 and comparative examples 1 to 10
As can be seen from tables 4 and 5, the winter application micro-expansion concrete provided by the embodiment of the application has good crack resistance in a low-temperature environment in winter, and the number of cracks per unit area is less than 10/m2The total cracking area per unit area is less than 130mm2/m2And example 7 is the best embodiment, and example 2 is the preferred embodiment.
By comparing the detection results of the examples 1-3 and the comparative examples 1-2, the fact that the incorporation of the NRF-H104 type polycarboxylic acid type antifreezing agent has no influence on the compressive strength of concrete is demonstrated, but the freezing and thawing resistance of the concrete can be obviously improved, and the crack resistance of the concrete can be obviously improved. The NRF-H104 type polycarboxylic acid antifreeze can effectively reduce the freezing point of concrete and improve the frost resistance of the concrete; and the water-cement ratio of the concrete can be effectively reduced, the compactness of the concrete is improved, and the crack resistance of the concrete is enhanced.
The test results of the comparative example 2, the examples 4 to 5 and the comparative examples 3 to 5 show that the high-performance expanding agent SY-G, the calcium dodecyl benzene sulfonate and the cetyl alcohol which are simultaneously doped can synergistically improve the expansion limiting rate and the dry shrinkage rate of the concrete, and the crack resistance of the concrete is improved to a certain extent, and the three are not necessary. The reason is that the SY-G high-performance expanding agent, the calcium dodecyl benzene sulfonate and the cetyl alcohol are simultaneously doped, the calcium dodecyl benzene sulfonate and the cetyl alcohol can synergistically control the reaction rate of the SY-G high-performance expanding agent and calcium hydroxide in cement slurry, the speed of generating the ettringite expanding component is better matched with the self contraction rate of the concrete, and therefore the compactness of the concrete is improved.
The test results of comparative example 2, examples 6 to 8 and comparative examples 6 to 10 show that the addition of p-methoxy fatty acid amido sodium benzenesulfonate and hydroxysuccinimide to example 2 has little influence on the expansion limiting rate, the shrinkage limiting rate and the freeze-thaw resistance of the concrete, but can further improve the compressive strength and the crack resistance of the concrete, and the addition of p-methoxy fatty acid amido sodium benzenesulfonate and hydroxysuccinimide has no defects.
The present embodiment is only for explaining the present application, and it is not limited to the present application, 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 application.
Claims (10)
1. A winter fertilization micro-expansion concrete is characterized in that: the raw materials comprise, by weight, 162 parts of water 156-activated carbon, 340 parts of cement 320-activated carbon, 118 parts of fly ash 112-activated carbon, 330 parts of machine-made sand 306-activated carbon, 330 parts of natural sand 306-activated carbon, 1147 parts of crushed stone 1103-activated carbon, 9.2-9.8 parts of antifreeze and 38-42 parts of composite admixture; the composite additive comprises 16 (0.3-0.5) to 0.3-0.5 (by weight) of expanding agent, calcium dodecyl benzene sulfonate and cetyl alcohol.
2. The winter fertilization micro-expansion concrete according to claim 1, wherein: the composite additive also comprises p-methoxy fatty amido sodium benzene sulfonate and hydroxysuccinimide, wherein the weight ratio of the p-methoxy fatty amido sodium benzene sulfonate to the expanding agent is (0.1-0.3):16, and the weight ratio of the hydroxysuccinimide to the expanding agent is (0.1-0.3): 16.
3. The winter fertilization micro-expansion concrete according to claim 1, wherein: the antifreezing agent is an NRF-H104 type polycarboxylic acid antifreezing agent.
4. The winter fertilization micro-expansion concrete according to claim 1, wherein: the expanding agent is a SY-G high-performance expanding agent.
5. The winter fertilization micro-expansion concrete according to claim 1, wherein: the cement is P. 042.5 Portland cement.
6. The winter fertilization micro-expansion concrete according to claim 1, wherein: the natural sand is the sand in the area II.
7. The winter fertilization micro-expansion concrete according to claim 1, wherein: the machine-made sand is sand in the area II.
8. The winter fertilization micro-expansion concrete according to claim 1, wherein: the fly ash is II type fly ash.
9. The winter fertilization micro-expansion concrete according to claim 1, wherein: the crushed stone is 5-25mm continuous graded crushed stone.
10. The method for preparing winter concrete according to any one of claims 1 to 9, wherein the method comprises the following steps: the method comprises the following steps:
(1) heating 25-35% of water to 35-45 ℃, adding the composite additive and the antifreezing agent, and stirring for 15-20 seconds to obtain an aqueous solution of the additive;
(2) heating the residual amount of water to 75-85 ℃, adding broken stone, natural sand and machine-made sand, stirring for 1-2min to uniformly mix and completely wet the aggregate, and cooling to 30-35 ℃ to prepare a first slurry;
(3) mixing the first slurry obtained in the step (2) with cement and fly ash, and stirring for 40-50 seconds to obtain a second slurry;
(4) and (4) mixing the aqueous solution of the additive and the second slurry obtained in the step (3), and stirring for 1-2min to obtain the winter application micro-expansion concrete.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716208A (en) * | 2022-04-24 | 2022-07-08 | 北京天地建设砼制品有限公司 | Winter fertilization micro-expansion concrete and preparation method thereof |
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| US20080096979A1 (en) * | 2004-11-08 | 2008-04-24 | Rubicon Research Pvt. Ltd. | Aqueous Pharmaceutical Coating |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080096979A1 (en) * | 2004-11-08 | 2008-04-24 | Rubicon Research Pvt. Ltd. | Aqueous Pharmaceutical Coating |
Non-Patent Citations (3)
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| 兰明章等: "《预拌砂浆实用检测技术》", 31 January 2008, 中国计量出版社 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114716208A (en) * | 2022-04-24 | 2022-07-08 | 北京天地建设砼制品有限公司 | Winter fertilization micro-expansion concrete and preparation method thereof |
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