CN105948553A - Sulfate-resistant anti-corrosion agent for cement-based material - Google Patents
Sulfate-resistant anti-corrosion agent for cement-based material Download PDFInfo
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- CN105948553A CN105948553A CN201610325829.8A CN201610325829A CN105948553A CN 105948553 A CN105948553 A CN 105948553A CN 201610325829 A CN201610325829 A CN 201610325829A CN 105948553 A CN105948553 A CN 105948553A
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- Prior art keywords
- cement
- metakaolin
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- concrete
- sulfate
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Classifications
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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
-
- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/61—Corrosion inhibitors
-
- 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
- C04B2111/2015—Sulfate resistance
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a sulfate-resistant anti-corrosion agent for a cement-based material. The sulfate-resistant anti-corrosion agent is prepared from components in parts by weight as follows: 60-90 parts of metakaolin, 1-10 parts of calcium stearate, 5-20 parts of barium carbonate and 0.1-1 part of lithium carbonate. Fly ash can be added, and the mass ratio of the fly ash to the metakaolin is 1:2. The consumption of the metakaolin is 6%-8% that of cementing materials in concrete, a little metakaolin is used, and the cost of concrete is reduced; calcium stearate is also used as a dispersing agent of metakaolin, the agglomeration of the metakaolin in the cement is reduced, and the utilization efficiency of the metakaolin is greatly improved; besides, BaCO3 and Li2CO3 serving as inorganic salt can improve the dispersity of the cement, the water consumption of the cement with normal consistency is reduced, and the work performance of concrete is improved; the corrosion resistance coefficient index of the anti-corrosion agent reaches 1.14 or above.
Description
Technical field
The invention belongs to building material technical field, relate to a kind of cement-based material additive, concrete a kind of cement-based material is with anti-
Sulfate preservative.
Background technology
Current Portland cement becomes in world wide inner concrete engineering with the economic advantages of its brilliance and service behaviour to be applied the most
Construction material widely.Concrete once be it is believed that it is that one can work under the conditions of any climatic environment, in this embodiment it is not even necessary to
The material of any maintenance cost, until its endurance issues is by more and more researcher extensive concerns.Concrete is due to durable
Property deficiency make a lot of building not up to service life occur as soon as non-mechanical property destroy, cause serious economic loss.At coagulation
In the destruction of soil component, sulfate is that in all environmental factorss, complexity and hazardness are maximum to the corrosion failure of cement concrete
A kind of.
China coastline is long, saline and alkaline, region, salt lake is more, and these region sulphates contents are the highest, and sulfate is to coagulation
The erosion of soil structure engineering is particularly acute, and the engineering such as many power stations, dam, tunnel, highway, harbour and airport is not reaching
Just there occurs before intended design service life expansion, ftracture, inefficacy etc. destroys.Additionally, xoncrete structure or component are at it
Other environmental factors effects being the most also subject to, such as: ambient temperature, relative humidity, drying and watering cycle, various load, freeze
Melting circulation etc., these factors are probably being overlapped mutually of one or more to the effect of concrete, easily to the ground of building with
And building lower concrete component produces bigger erosion, affect stability and the safety of concrete component, to person property
Safety produces and threatens.
One of important content that the resisting erosion of sulfate ability improving cement concrete has become as in concrete durability design.Mesh
Before, the sulfuric-resisting salt corrosion of cement concrete can consider from following several directions: 1) appropriate design concrete match ratio is when adopted
With appropriate maintaining process.But shortcoming is resisting erosion of sulfate poor effect；2) special cement-sulfate-resistant cement is used.Although
The cement concrete resisting erosion of sulfate using sulfate-resistant cement to prepare is respond well, but sulfate-resistant cement manufacturer is few,
The source of goods is in short supply, and freight is higher, and construction costs is high；3) subject to the region of sulphate corrosion at concrete and carry out coating protection.
Adopting shortcoming in this way is that protection is relatively costly, and big multicoat be organic compound, uvioresistant and ageing-resistant performance not
Good, easily come off thus fail to reach to protect purpose.Also there is the product of a small amount of similar concrete antiseptic agent in recent years on market, have
Material composition more, complex manufacturing technology, and the condition of use is harsh, relatively costly；Some early stage resisting erosion of sulfate are imitated
The best, anaphase effect does not reaches requirement.Such as number of patent application be 201110029460.3 Chinese patent disclose " a kind of tool
Have the antirust for reinforced concrete of sulfate-resistant corrosion function ", its raw material by multiple extender, metasilicate, mineral admixture,
Hydroxyl hydroxy acid salt etc. form.Extender is calcium sulphoaluminate-calcium oxide expansion agents and the mixture of calcium sulphoaluminate class extender or sulfur aluminum
Acid calcium-calcium oxide, metasilicate be sodium metasilicate, metasilicic acid bury, one or more compositions in potassium metasilicate, hydroxyl hydroxy acid
Salt is one or more compositions in zinc gluconate, maltonic acid sodium, potassium gluconate, and mineral admixture is also levigate ore deposit
One or both compositions in slag, silica flour, relate to raw material variety more, prepare the most complicated.Additionally, this patent is in preparation work
Skill needs to be preheated to Organic substance 50 DEG C, is subsequently adding active component and alkali matter, mix to dissolve, be eventually adding silicon ash,
Its complicated process of preparation.The most such as number of patent application be 201010256189.2 Chinese patent disclose " agent on crack resistance of concrete sulfate
Corroding preservative " its raw material consists of super finely ground slag, sulphoaluminate cement clinker, anhydrite, though component is few, but its sulfuric-resisting
Salt corrosion coefficient the most only between 0.89-0.93, resisting erosion of sulfate DeGrain.
Summary of the invention
The present invention be directed to the problem that prior art exists, propose a kind of cement-based material sulfate corrosion-resistance preservative, its composition
Material is simple, and technique is more simple, and antiseptic effect is notable.
A kind of cement-based material sulfate resistance preservative, its composition meter by weight is as follows:
Metakaolin 60-90 part；Calcium stearate 1-10 part；Brium carbonate 5-20 part；Lithium carbonate 0.1-1 part.
By such scheme, it is also added into flyash；Its consumption and higher territory mass ratio are 1:2.
By such scheme, described flyash conformance with standard GB 1596-2005 " flyash in cement, concrete " is advised
II level ash requirement, specific surface area >=600m2/kg。
By such scheme, described metakaolin is formed through 600 DEG C～800 DEG C of calcinings by Kaolin, and key component is amorphous silicic acid
Salt, specific surface area >=2500m2/ Kg, its 28d pozzolanic activity index is more than 110%.
By such scheme, described sulfate resistance preservative consumption in cement based gel rubber material is 7-13wt%.
By such scheme, metakaolin 84 parts；Calcium stearate 5 parts；Brium carbonate 10 parts；Lithium carbonate 1 part.
By such scheme, metakaolin 60 parts；30 parts of flyash；Calcium stearate 3.2 parts；Brium carbonate 6.2 parts；Lithium carbonate
0.6 part.
Metakaolin (MK): one, the particle diameter of MK is more much smaller than the particle diameter of cement granules, it is possible to pack portion hole, carries
High slurry internal particle bulk density, limits Ca (OH)2, the growing space of C-S-H gel, block intercommunicating pore passage, carry
High concrete density, its two, MK can promote cement early hydration by nucleus effect, thus reduce in early days that slurry porosity is also
Refinement aperture.Its three, MK can with hydrated cementitious produce Ca (OH)2Reaction generates C-S-H gel, further air-free concrete
Structure.Its four, MK replaces part of cement grog, to 3CaO Al in cement2O3(C3A) total content of mineral has certain dilute
Release effect, thus decrease the generation of the dilatancy products such as entringite, enhance the concrete resistivity to sulfate.Its five,
The most easily by the Ca (OH) of sulfate attack in Behavior of Hardened Cement Paste hydrated product2Amount along with MK occur secondary response consumed in a large number, prolong
Generating of property entringite increases with the difficulty existed late.
Brium carbonate BaCO3: can be with the SO in encroached water mudstone4 2-Reaction, generates and least holds labile BaSO4, thus more
Further add the degree of compaction of concrete；Next avoids retardance suppression entringite (AFt) and CaSO4Generation.
Lithium carbonate Li2CO3: the single carbon type aquation carbon aluminum of generation can be reacted with hydrolysis product of cement list sulfur type calcium sulphoaluminate (AFm)
Acid calcium (Cm), promotes to change containing Al low expansion product in opposite directions in cement, Li simultaneously2CO3It is again a kind of soluble carbonate salt,
Thus the CaO that dissociates out from entringite is easy to and Li2CO3Reaction forms the CaCO that dissolubility is low3, thus cause calcium vitriol
The generation that stone is gradually decomposed in suppression cement in entringite, thus improve the sulphate-corrosion resistance energy of Behavior of Hardened Cement Paste.
Calcium stearate: calcium stearate absorption forms layer of hydrophobic thin film, the sulfate in encroached water mudstone at cement particle surface
React difficulty with the hydrated product of cement to increase.
Metakaolin volume in cement concrete is generally about the 10%-15% of gel material content, and consumption is excessive, cost
Higher；The dispersibility of metakaolin is poor, can produce " reunion " phenomenon in concrete, and the quality making concrete is unstable；
Metakaolin also has water absorption, can increase the denseness of concrete in concrete during a large amount of use, reduces the workability of concrete
Energy.
The present invention compared with prior art has the advantage that and good effect:
In the present invention, metakaolin consumption is only equivalent to about the 6%-8% of gel material content in concrete, and consumption is low, reduces
The cost of concrete；Calcium stearate is also used simultaneously as the dispersant of metakaolin, reduces metakaolin agglomeration in cement,
Drastically increase the utilization ratio of metakaolin；Meanwhile, BaCO3And Li2CO3The dispersion of cement can be improved as inorganic salt
Property, reduce the normal consistency water requirement of cement, improve the workability of concrete.
The sulfate corrosion-resistance preservative raw material of the present invention is readily available, and the simplest raw material forms, and processing technology is simple, can
Strong operability, mixes through simple and mechanical, has significant Social benefit and economic benefit.
Product of the present invention is salt and mineral admixture, nontoxic, has no adverse effects environment.Additionally, the sulfur resistive of the present invention
Hydrochlorate corrodes preservative to have increase early age strength of concrete, accelerates cement setting hardening, raising agent on crack resistance of concrete Chloride Attack,
Anti-carbonation, anti-drying and watering cycle ability, in preservative addition concrete, the workability to fresh concrete has no adverse effect, permissible
Significantly improve technical specification and the economic indicator of concrete, reduce the follow-up maintenance cost of concrete component.
The coefficient index against corrosion of sulfate corrosion-resistance preservative of the present invention reaches more than 1.14.Sulfate corrosion-resistance preservative performance refers to
Mark complies fully with technology requirement relevant in " agent on crack resistance of concrete Sulfates corrodes preservative " (JC/T 1011-2006), agent on crack resistance of concrete
Sulfate attack test reaches KS120 grade.
Detailed description of the invention
Embodiment 1
Application in mortar, its match ratio is as follows:
In preservative, each component and weight percent content thereof are as follows:
MK:84 part, is formed through 600 DEG C～800 DEG C of calcinings by Kaolin, and key component is amorphous silicate, specific surface area
≥2500m2/ Kg, its 28d pozzolanic activity index is more than 110%；
Calcium stearate: 5 parts, analytical pure, purity >=99%；
Brium carbonate: 10 parts, analytical pure, purity >=99%；
Lithium carbonate: 1 part, analytical pure, purity >=99%.
The sulfate corrosion-resistance preservative for concrete related performance indicators made by the present embodiment proportioning is as follows:
Setting time: presetting period 145min, final setting time 4.2h；
Compressive strength rate: 7d compressive strength rate 116%, 28d compressive strength rate 127%；
Expansion rate: ld expansion rate 0.034%, 28d expansion rate 0.176%；
The coefficient of expansion: 1.00；
Coefficient against corrosion: 1.14.
Embodiment 2
Application in mortar, its match ratio is as follows:
In preservative, each component and weight percent content thereof are as follows:
MK:60 part, is formed through 600 DEG C～800 DEG C of calcinings by Kaolin, and key component is amorphous silicate, specific surface area
≥2500m2/ Kg, its 28d pozzolanic activity index is more than 110%；
Calcium stearate: 3.4 parts, analytical pure, purity >=99%；
Brium carbonate: 2.5 parts, analytical pure, purity >=99%；
Lithium carbonate: 0.1 part, analytical pure, purity >=99%.
Flyash: 30 parts, for industry byproduct, conformance with standard GB 1596-2005 " flyash in cement, concrete "
The II level ash requirement of regulation, key component is vitreous body Al2O3And SiO2, specific surface area >=600m2/kg；
The sulfate corrosion-resistance preservative for concrete related performance indicators made by the present embodiment proportioning is as follows:
Setting time: presetting period 166min, final setting time 4.5h；
Compressive strength rate: 7d compressive strength rate 108%, 28d compressive strength rate 131%；
Expansion rate: ld expansion rate 0.025%, 28d expansion rate 0.146%；
The coefficient of expansion: 1.24；
Coefficient against corrosion: 1.38.
Embodiment 3
Application in concrete (C40), its match ratio is as follows:
In preservative, each component and weight percent content thereof are as follows:
MK:60 part, is formed through 600 DEG C～800 DEG C of calcinings by Kaolin, and key component is amorphous silicate, and specific surface area >=
2500m2/ Kg, its 28d pozzolanic activity index is more than 110%；
Flyash: 30 parts, for industry byproduct, conformance with standard GB 1596-2005 " flyash in cement, concrete "
The II level ash requirement of regulation, key component is vitreous body Al2O3And SiO2, specific surface area >=600m2/kg；
Calcium stearate: 3.2 parts, analytical pure, purity >=99%；
Brium carbonate: 6.2 parts, analytical pure, purity >=99%；
Lithium carbonate: 0.6 part, analytical pure, purity >=99%.
The sulfate corrosion-resistance preservative for concrete related performance indicators made by the present embodiment proportioning is as follows:
Setting time: presetting period 136min, final setting time 3.9h；
Compressive strength rate: 7d compressive strength rate 110%, 28d compressive strength rate 141%；
Expansion rate: ld expansion rate 0.028%, 28d expansion rate 0.101%；
The coefficient of expansion: 1.01；
Coefficient against corrosion: 1.28.
Embodiment 4
Application in concrete (C40), its match ratio is as follows:
In preservative, each component and weight percent content thereof are as follows:
MK:80 part, is formed through 600 DEG C～800 DEG C of calcinings by Kaolin, and key component is amorphous silicate, and specific surface area >=
2500m2/ Kg, its 28d pozzolanic activity index is more than 110%；
Calcium stearate: 6.4 parts, analytical pure, purity >=99%；
Brium carbonate: 12.4 parts, analytical pure, purity >=99%；
Lithium carbonate: 1.2 parts, analytical pure, purity >=99%.
The sulfate corrosion-resistance preservative for concrete related performance indicators made by the present embodiment proportioning is as follows:
Setting time: presetting period 150min, final setting time 4.9h；
Compressive strength rate: 7d compressive strength rate 107%, 28d compressive strength rate 121%；
Expansion rate: ld expansion rate 0.018%, 28d expansion rate 0.123%；
The coefficient of expansion: 0.99；
Coefficient against corrosion: 1.15.
In above-mentioned two embodiments, the manufacture method of sulfate corrosion-resistance preservative for concrete is as follows: by levigate for MK to specific surface area >=
2500m2/ kg, then by satisfactory raw material by match ratio precise；Mechanical mixture is uniformly.
Above-mentioned two embodiments are all using sulfate corrosion-resistance preservative volume 10wt% as experimental condition, according to " agent on crack resistance of concrete
Sulfate attack preservative " prescriptive procedure is tested in (JC/T 1011-2006) standard.
In above-mentioned two embodiments the indices of sulfate corrosion-resistance preservative for concrete all reach Concrete Resist Reinforcing Sulfate Corrosion prevent
Rotten agent " indices requirement in (JC/T 1011-2006), the especially coefficient against corrosion of embodiment two reaches 1.28, is significantly larger than
Standard coefficient against corrosion 0.85, illustrates that preservative resisting erosion of sulfate effect is notable.
Claims (7)
1. a cement-based material sulfate resistance preservative, it is characterised in that composition meter by weight is as follows:
Metakaolin 60-90 part；Calcium stearate 1-10 part；Brium carbonate 5-20 part；Lithium carbonate 0.1-1 part.
2. cement-based material sulfate resistance preservative as claimed in claim 1, it is characterised in that be also added into flyash；Fine coal
Ash consumption is 1:2 with higher territory mass ratio.
3. cement-based material sulfate resistance preservative as claimed in claim 2, it is characterised in that described flyash meets II level
Ash requirement, specific surface area >=600m2/kg。
4. cement-based material sulfate resistance preservative as claimed in claim 1, it is characterised in that described metakaolin is by Kaolin
Form through 600 DEG C～800 DEG C of calcinings, specific surface area >=2500m2/ Kg, its 28d pozzolanic activity index is more than 110%.
5. cement-based material sulfate resistance preservative as claimed in claim 1, it is characterised in that described sulfate resistance preservative exists
Consumption in cement based gel rubber material is 6-8wt%.
6. cement-based material sulfate resistance preservative as claimed in claim 1, it is characterised in that metakaolin 84 parts；Stearic
Acid calcium 5 parts；Brium carbonate 10 parts；Lithium carbonate 1 part.
7. cement-based material sulfate resistance preservative as claimed in claim 2, it is characterised in that metakaolin 60 parts；Fine coal
Ash 30 parts；Calcium stearate 3.2 parts；Brium carbonate 6.2 parts；Lithium carbonate 0.6 part.
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Cited By (8)
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| CN112028531A (en) * | 2020-08-24 | 2020-12-04 | 潍坊纵横建材有限公司 | Concrete corrosion-proof rust-proof composite additive and preparation method thereof |
| CN112358253A (en) * | 2020-09-25 | 2021-02-12 | 桐乡市钟大建材有限公司 | Special anti-corrosion concrete for building and production system thereof |
| CN113200689A (en) * | 2021-05-18 | 2021-08-03 | 山东崇正特种水泥有限公司 | Production method for improving sulfate erosion resistance and chloride permeability resistance of portland cement |
| CN113403901A (en) * | 2021-05-22 | 2021-09-17 | 山东高速工程建设集团有限公司 | Cement modified soil roadbed filling process |
| CN114560719A (en) * | 2022-03-09 | 2022-05-31 | 中国建筑第二工程局有限公司 | Foamed lightweight soil material for high sulfate erosion resistance environment, preparation and application |
| CN116283087A (en) * | 2023-03-01 | 2023-06-23 | 四川省建筑科学研究院有限公司 | High-durability concrete for drainage pipeline and application thereof |
| CN116496021A (en) * | 2023-05-19 | 2023-07-28 | 日照海工研新材料有限公司 | Marine corrosion inhibitor and preparation method thereof |
| CN117467292A (en) * | 2023-10-30 | 2024-01-30 | 山东高速建设管理集团有限公司 | Sulfate erosion resistant protective coating for concrete surface layer and application thereof |
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| CN112028531A (en) * | 2020-08-24 | 2020-12-04 | 潍坊纵横建材有限公司 | Concrete corrosion-proof rust-proof composite additive and preparation method thereof |
| CN112028531B (en) * | 2020-08-24 | 2022-06-17 | 潍坊纵横建材有限公司 | Concrete corrosion-proof rust-proof composite additive and preparation method thereof |
| CN112358253A (en) * | 2020-09-25 | 2021-02-12 | 桐乡市钟大建材有限公司 | Special anti-corrosion concrete for building and production system thereof |
| CN112358253B (en) * | 2020-09-25 | 2022-05-17 | 桐乡市钟大建材有限公司 | Special anti-corrosion concrete for building and production system thereof |
| CN113200689A (en) * | 2021-05-18 | 2021-08-03 | 山东崇正特种水泥有限公司 | Production method for improving sulfate erosion resistance and chloride permeability resistance of portland cement |
| CN113403901A (en) * | 2021-05-22 | 2021-09-17 | 山东高速工程建设集团有限公司 | Cement modified soil roadbed filling process |
| CN113403901B (en) * | 2021-05-22 | 2022-09-09 | 山东高速工程建设集团有限公司 | Cement modified soil roadbed filling process |
| CN114560719A (en) * | 2022-03-09 | 2022-05-31 | 中国建筑第二工程局有限公司 | Foamed lightweight soil material for high sulfate erosion resistance environment, preparation and application |
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