CN110922130B - Preparation process of corrosion-resistant concrete - Google Patents
Preparation process of corrosion-resistant concrete Download PDFInfo
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- CN110922130B CN110922130B CN201911206083.9A CN201911206083A CN110922130B CN 110922130 B CN110922130 B CN 110922130B CN 201911206083 A CN201911206083 A CN 201911206083A CN 110922130 B CN110922130 B CN 110922130B
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- concrete
- coarse aggregate
- sand
- curing
- porous fiber
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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
- 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
- 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)
- 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 invention relates to the technical field of building materials, and discloses a preparation process of corrosion-resistant concrete, which comprises the following steps: 1) preparing sand-free porous coarse aggregate concrete; 2) uniformly stirring an adhesive, a curing agent, a filler, fine sand and the like; 3) injecting the slurry of the step 2) into the porous coarse aggregate concrete in the step 1) under the vacuum condition; 4) curing for 1-2 h by microwave or curing for 3-28 d at normal temperature. The process greatly improves the erosion resistance of the concrete, and the concrete has smaller shrinkage deformation.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a preparation process of corrosion-resistant concrete.
Background
Concrete structures are susceptible to chemical agents and environments due to their own porous nature, and thus have poor durability. In order to improve the durability of concrete, it is often necessary to add to the concrete some supplementary cementitious material: such as slag powder, fly ash, various metallurgical slag powders, etc., or by adding ultra-fine materials such as nano-materials, glass bead powder, or some additives such as water reducing agents, various emulsions, etc., or a combination of the above methods. However, the above methods do not fundamentally improve the durability of concrete.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a preparation process of corrosion-resistant concrete, which greatly improves the corrosion resistance of the concrete, and the concrete has smaller shrinkage deformation.
The technical scheme is as follows: the invention provides a preparation process of corrosion-resistant concrete, which comprises the following steps: 1) preparing sand-free porous fiber coarse aggregate concrete; 2) uniformly stirring an adhesive, a curing agent, a filler, fine sand and the like to obtain slurry; 3) injecting the slurry into the sand-free porous fiber coarse aggregate concrete in the step 1) under a vacuum condition; 4) and (3) performing microwave curing on the material obtained in the step 3) for 1-2 hours or curing at normal temperature for 3-28 days.
Further, after the step 1) and before the step 2), the method further comprises the following steps: and (3) performing steam curing on the sand-free porous fiber coarse aggregate concrete at the temperature of 40-90 ℃ for 3-12 h, or performing normal-temperature curing for 1-28 d.
Preferably, the vacuum degree of the vacuum condition in the step 3) is 600mmHg to 50 mmHg.
Preferably, the porosity of the sand-free porous fiber coarse aggregate concrete is 10-50%.
Preferably, the coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate.
Preferably, the porous aggregate is subjected to water saturation, cement paste coating and curing treatment before use.
Preferably, the adhesive is any one or a combination of the following: unsaturated polyester resin, vinyl ester, phenolic resin and epoxy resin.
Preferably, the filler is steel slag powder; the curing agent is methyl ethyl ketone peroxide.
Preferably, the fineness modulus of the fine sand is less than 1.0.
Has the advantages that: compared with the prior art, the invention has the following obvious advantages:
1) according to the invention, the adhesive and the curing agent are adopted to fill the macropores in the concrete in a manner of grouting into the sand-free porous fiber coarse aggregate concrete under a vacuum condition, so that the micropores in the concrete are blocked, the compactness of the concrete is improved, and the chemical corrosion resistance of the concrete is improved.
2) According to the invention, the porous coarse aggregate which is saturated with water and coated with slurry is adopted, and when the interior of the concrete matrix is lack of water, the water in the porous coarse aggregate can be transmitted to the interior of the concrete matrix, so that the effect of internal curing is achieved.
3) The invention adopts the steel slag powder as the filler, and effectively utilizes the solid waste steel slag. Because free calcium oxide in the steel slag powder can react with water, expansive calcium hydroxide can be formed at a later stage to cause concrete cracking. The steel slag powder is used as the filler in the adhesive and the curing agent, so that the contact between the steel slag powder and water is avoided, the reaction of the steel slag powder is avoided, and the utilization of the steel slag powder is promoted.
Detailed Description
The present invention will be described in detail with reference to the following embodiments.
Embodiment 1:
1) preparing sand-free porous fiber coarse aggregate concrete: the concrete comprises the following components in percentage by weight: 400 parts of PO42.5 cement, 1500 parts of coarse aggregate, 10 parts of fiber, 200 parts of water and 4 parts of water reducing agent. The coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate, and the treatment such as slurry coating, maintenance and the like needs to be carried out by water saturation and cement paste before use. The steam curing temperature of the sand-free porous fiber coarse aggregate concrete is 90 ℃, the curing time is 3h, and the porosity is 40%.
2) Uniformly stirring 50 parts of unsaturated polyester resin, 10 parts of methyl ethyl ketone peroxide, 30 parts of steel slag powder and 10 parts of fine sand with the fineness modulus being less than 1.0;
3) injecting the slurry obtained in the step 2) into the sand-free porous fiber coarse aggregate concrete in the step 1) under the vacuum condition of 400mmHg of vacuum degree;
4) and curing at normal temperature for 28 d.
Embodiment 2:
1) preparing sand-free porous fiber coarse aggregate concrete: the concrete comprises the following components in percentage by weight: 400 parts of PO42.5 cement, 1500 parts of coarse aggregate, 10 parts of fiber, 200 parts of water and 4 parts of water reducing agent. The coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate, and the treatment such as slurry coating, maintenance and the like needs to be carried out by water saturation and cement paste before use. The curing temperature of the sand-free porous fiber coarse aggregate concrete is 40 ℃, the curing time is 12h, and the porosity is 50%.
2) Uniformly stirring 30 parts of unsaturated vinyl ester, 5 parts of methyl ethyl ketone peroxide, 10 parts of steel slag powder and 55 parts of fine sand with the fineness modulus being less than 1.0;
3) injecting the slurry obtained in the step 2) into the sand-free porous fiber coarse aggregate concrete in the step 1) under the vacuum condition of 500 mmHg;
4) and curing at normal temperature for 3 d.
Embodiment 3:
1) preparing sand-free porous fiber coarse aggregate concrete: the concrete comprises the following components in percentage by weight: 500 parts of PO42.5 cement, 1200 parts of coarse aggregate, 10 parts of fiber, 200 parts of water and 4 parts of water reducing agent. The coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate, and the treatment such as slurry coating, maintenance and the like needs to be carried out by water saturation and cement paste before use. The curing temperature of the sand-free porous fiber coarse aggregate concrete is 20 ℃ at normal temperature, the curing time is 28d, and the porosity is 30%.
2) Uniformly stirring 50 parts of unsaturated phenolic resin, 20 parts of methyl ethyl ketone peroxide, 20 parts of steel slag powder and 10 parts of fine sand with the fineness modulus being less than 1.0;
3) injecting the slurry obtained in the step 2) into the sand-free porous fiber coarse aggregate concrete in the step 1) under the vacuum condition of 600 mmHg;
4) curing for 1h at 90 ℃ by microwave.
Embodiment 4:
1) preparing sand-free porous fiber coarse aggregate concrete: the concrete comprises the following components in percentage by weight: 500 parts of PO42.5 cement, 1500 parts of coarse aggregate, 10 parts of fiber, 200 parts of water and 4 parts of water reducing agent. The coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate, and the treatment such as slurry coating, maintenance and the like needs to be carried out by water saturation and cement paste before use. The curing temperature of the sand-free porous fiber coarse aggregate concrete is 20 ℃ at normal temperature, the curing time is 28d, and the porosity is 10%.
2) Uniformly stirring 60 parts of unsaturated epoxy resin, 20 parts of methyl ethyl ketone peroxide, 15 parts of steel slag powder, 5 parts of fine sand with the fineness modulus smaller than 1.0 and the like;
3) injecting the slurry obtained in the step 2) into the sand-free porous fiber coarse aggregate concrete in the step 1) under the vacuum condition of 150 mmHg;
4) curing for 2h at 60 ℃ by microwave.
Comparative example:
ordinary concrete of the same strength was prepared according to the compressive strengths of embodiments 1 to 4, and the mix ratio of the ordinary concrete was PO42.5 cement 400 parts, fine aggregate 700 parts, coarse aggregate 1100 parts, fiber 10 parts, water 200 parts, and water reducing agent 5 parts.
The performance evaluations of the embodiments 1 to 4 and the comparative example were carried out with reference to the Standard ordinary concrete mechanical test method (GB/T50081-2002) and the Standard ordinary concrete Long-term Performance and durability test method Standard (GB/T50082-2009).
The main performance indexes of embodiments 1 to 4 and the comparative example are shown in table 1.
TABLE 1
As can be seen from Table 1, compared with the concrete prepared by the conventional method (comparative example), the concrete prepared by the preparation method of the present invention has a much higher flexural strength than that of the conventional concrete, a much higher sulfate corrosion resistance than that of the conventional concrete, and a very low dry shrinkage value.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. The preparation process of the corrosion-resistant concrete is characterized by comprising the following steps of:
1) preparing sand-free porous fiber coarse aggregate concrete; the coarse aggregate in the sand-free porous fiber coarse aggregate concrete is porous aggregate; the porous aggregate is subjected to water saturation, cement paste coating and curing treatment before use;
2) uniformly stirring an adhesive, a curing agent, a filler and fine sand to obtain slurry; the adhesive is any one or combination of the following adhesives: unsaturated polyester resins, vinyl esters, phenolic resins, epoxy resins; the filler is steel slag powder; the curing agent is methyl ethyl ketone peroxide; the fineness modulus of the fine sand is less than 1.0;
3) injecting the slurry into the sand-free porous fiber coarse aggregate concrete in the step 1) under a vacuum condition;
4) and (3) performing microwave curing or normal-temperature curing on the material obtained in the step 3).
2. The process for preparing erosion resistant concrete according to claim 1, further comprising the following steps after step 1) and before step 2):
and (3) performing steam curing on the sand-free porous fiber coarse aggregate concrete at the temperature of 40-90 ℃ for 3-12 h, or performing normal-temperature curing for 1-28 d.
3. The process for preparing erosion resistant concrete according to claim 1, wherein the degree of vacuum of the vacuum condition in the step 3) is 600mmHg to 50 mmHg.
4. The process for preparing the erosion-resistant concrete according to claim 1, wherein in the step 4), the material obtained in the step 3) is cured for 1-2 hours by microwave or cured at normal temperature for 3-28 days.
5. The process for preparing erosion-resistant concrete according to any one of claims 1 to 4, wherein the porosity of the sand-free porous fiber coarse aggregate concrete is 10-50%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911206083.9A CN110922130B (en) | 2019-11-29 | 2019-11-29 | Preparation process of corrosion-resistant concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911206083.9A CN110922130B (en) | 2019-11-29 | 2019-11-29 | Preparation process of corrosion-resistant concrete |
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| CN110922130A CN110922130A (en) | 2020-03-27 |
| CN110922130B true CN110922130B (en) | 2021-09-07 |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103864355A (en) * | 2012-12-17 | 2014-06-18 | 南通众润混凝土有限公司 | Mixed type high-performance light concrete |
| CN105036612B (en) * | 2015-07-23 | 2016-10-26 | 南京道润交通科技有限公司 | High intensity ultra-tough resin concrete and manufacture method thereof |
| CN105461267A (en) * | 2015-12-27 | 2016-04-06 | 青岛宏宇环保空调设备有限公司 | Anti-corrosion concrete |
| KR101763664B1 (en) * | 2017-01-10 | 2017-08-02 | 동양특수콘크리트 (주) | Corrosion resistant manhole block and method for manufacturing the same |
| CN108341621A (en) * | 2018-02-28 | 2018-07-31 | 无锡金久泓科技有限公司 | A kind of resin concrete and preparation method thereof that fluorine monomer is modified |
| CN108358516A (en) * | 2018-04-27 | 2018-08-03 | 陈艳琳 | A kind of corrosion resistant concrete |
| CN108821677A (en) * | 2018-06-15 | 2018-11-16 | 重庆建工建材物流有限公司 | Ultralight big partial size haydite concrete and preparation method thereof for light cellular partition board |
| CN110092626B (en) * | 2019-06-04 | 2021-09-10 | 贵州中建建筑科研设计院有限公司 | Preparation method of lightweight aggregate concrete |
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