CN106699004B - A kind of precoating surfaces method for cement-based material crack selfreparing - Google Patents
A kind of precoating surfaces method for cement-based material crack selfreparing Download PDFInfo
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- CN106699004B CN106699004B CN201710045212.5A CN201710045212A CN106699004B CN 106699004 B CN106699004 B CN 106699004B CN 201710045212 A CN201710045212 A CN 201710045212A CN 106699004 B CN106699004 B CN 106699004B
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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
- 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
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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
- C04B41/4572—Partial coating or impregnation of the surface of the substrate
-
- 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
- C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
- C04B41/48—Macromolecular compounds
- C04B41/4803—Polysaccharides, e.g. cellulose, or derivatives thereof
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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
- C04B41/62—Coating or impregnation with organic materials
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Architecture (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Materials For Medical Uses (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of precoating surfaces methods for cement-based material crack selfreparing, comprising the following steps: (1) will be configured to bacterium solution with the immobilized colloid bacillus cereus bacterium powder of nutrients；(2) hydrophilic thickeners are added into bacterium solution, obtain repairing liquid；(3) weak acid pretreatment fluid is prepared, sprays weak acid pretreatment fluid first to cement-based material surface before liquid is repaired in spraying；(4) liquid is repaired in spraying after cement-based material surface sprays weak acid pretreatment fluid 10min.Repairing test the result shows that, calcium carbonate can be settled out in 7d at cement-based material crack, after continuous repair 30d, averagely splitting width 0.4mm microcrack below can repair completely.
Description
Technical field
It is the invention belongs to the interdisciplinary science technology of microbiological art and civil engineering materials field, in particular to a kind of micro-
The coating method of biological self repairing agent.
Background technique
Cement-based material is presently the most extensive construction material, becomes current or even later a very long time already
Interior mostly important construction material.However, problem of Cracking can be rated as " cancer " of cement-based material and annoying numerous cement always
Concrete research personnel.Crack is easily generated with cement-based material under the influence of ambient enviroment in use, so that
Corrosive media is easy to invade material internal, damages to concrete itself and pre-buried reinforcing bar, dramatically shortens
The service life of concrete structure, causes huge economic loss and security risk.
The methods of traditional restorative procedure such as inorganic matter reparation, organic matter reparation is widely used, but due to concrete knot
Structure is complicated and minute crack detection difficult, and mending a split becomes time and effort consuming and expense is huge.It applies on cement-based material surface
The method of precoating microbiocidal self repairing agent, can save the link of Crack Detection, when crack occurs microorganism in water and
It induces mineralising to generate calcium carbonate-filled cement-based material crack region under the action of air, realizes the self-healing of distress in concrete,
With great economic benefit and social benefit.
Summary of the invention
In order to improve the self-healing capability of cement-based material, structure durability is improved, the object of the present invention is to provide one kind
For the precoating surfaces method of cement-based material crack selfreparing, once cement base generates crack, microorganism is in water and air
Under the action of induction mineralising generate calcium carbonate-filled crack area, realize Crack Self-healing in Cementitious Materials.
To achieve the above object, the technical solution adopted by the present invention are as follows:
A kind of precoating surfaces method for cement-based material crack selfreparing, comprising the following steps:
(1) bacterium solution will be configured to the immobilized colloid bacillus cereus bacterium powder of nutrients；
(2) hydrophilic thickeners are added into bacterium solution, obtain repairing liquid；
(3) weak acid pretreatment fluid is prepared, sprays weak acid pretreatment fluid first to cement-based material table before liquid is repaired in spraying
Face；
(4) liquid is repaired in spraying after cement-based material surface sprays weak acid pretreatment fluid 10min.
In step (1), the concentration of bacterium solution is 0.5~1.0g/mL.
In step (1), the concentration for being added to hydrophilic thickeners in bacterium solution after hydrophilic thickeners is 0.3~0.8g/mL.
In step (2), hydrophilic thickeners are sodium alginate.
In step (2), after adding hydrophilic thickeners, repairing the bacterial strain concentration in liquid is 109~1010cell/mL。
In step (3), weak acid pretreatment fluid is acetic acid.
The pH=5 of the weak acid pretreatment fluid.
In step (4), spraying repairs liquid twice, and twice of spray time interval is 5min.
The utility model has the advantages that compared with prior art, the present invention having the advantage that
1, compared with traditional restorative procedure, coating self repairing agent in surface has the microorganism of mineralization ability can be certainly later
Innervation knows the generation in crack, induces mineralization product to fill crack at crack in time, realizes the selfreparing in crack；
2, the present invention can save huge Crack Detection and manpower renewal expense, improve structure durability；
3, compared with existing repairing method of microorganism, using the coating method can to avoid externally plus calcium source dependence,
Avoid additional calcium source to the adverse effect of cement-based material while reducing cost；
The present invention realizes the selfreparing to cement-based material crack, the inorganic mineral carbonic acid that crack area induces mineralising to generate
The compatibility of calcium and matrix is good and environmental-friendly.
Detailed description of the invention
Fig. 1 is the reparation feelings by the crack restorative procedure mean breadth 0.20mm continuous repair 30d different larval instar of the invention
Condition；
Fig. 2 is the reparation feelings by the crack restorative procedure mean breadth 0.40mm continuous repair 30d different larval instar of the invention
Condition；
Fig. 3 is the reparation feelings by the crack restorative procedure mean breadth 0.60mm continuous repair 30d different larval instar of the invention
Condition；
Comparative situation of the different in width crack using method of the invention that Fig. 4 is in different larval instar remediation efficiency.
Specific embodiment
Colloid bacillus cereus used in the present invention (Bacillus mucilaginous) is from Chinese industrial microbial bacteria
Kind collection, number 21698.
Precoating surfaces method for cement-based material crack selfreparing of the invention realizes cement-based material crack
Selfreparing, steps are as follows:
(1) colloid bacillus cereus (Bacillus mucilaginous) freeze-dried vaccine powder is obtained: by colloid bacillus cereus
(Bacillus mucilaginous) be inoculated in sterilizing after culture medium solution, every liter of culture medium contain 10~12g of sucrose,
Na2HPO4·12H2O2~3g, MgSO40.5~0.6g, CaCO30.8~1.5g.KCl0.2~0.3g, (NH4)2SO40.3~
0.6g, 0.2~0.4g of yeast extract, and controlling pH is 7~8, shaken cultivation 12h, obtains containing colloid at 30~37 DEG C
The bacterium solution of bacillus (Bacillus mucilaginous), through 6000~8000rpm high speed centrifugation, 10~15min at 4 DEG C
Afterwards, it removes after upper layer culture medium substance plus deionized water, is subsequently placed in freeze drier that be dried to bacterium powder in -10 DEG C spare.
(2) repair liquid prepare: by with the immobilized colloid bacillus cereus bacterium powder of nutrients be formulated as concentration be 0.5~
1.0g/mL bacterium solution adds hydrophilic thickeners sodium alginate into bacterium solution, in bacterium solution the concentration of hydrophilic thickeners be 0.3~
0.8g/mL, the bacterial strain concentration repaired in liquid at this time is about 109~1010cell/mL；
(3) pre- low acidified processing: preparing the acetic acid pretreatment fluid of pH=5, and it is pre- to spray weak acid first before liquid is repaired in spraying
Treatment fluid；
(4) repair liquid spraying: liquid two is repaired in spraying after cement-based material surface sprays a weak acid pretreatment fluid 10min
Time, spray time interval 5min twice；
(5) maintenance is repaired: the test specimen after coating processing being fractureed using pressure and the steel wire for inlaying different-diameter is precast
Then test specimen is placed in standard concrete fog room and conserves by the crack of different in width.It records and tests different reparation ages
Repairing effect, repairing test the result shows that, calcium carbonate, continuous repair 30d can be settled out in 7d at cement-based material crack
Afterwards, averagely splitting width 0.4mm microcrack below can repair completely.
Embodiment 1
(1) sucrose 10g, Na are weighed2HPO4·12H2O 2g、MgSO40.5g、CaCO31.0g、KCl0.2g、(NH4)2SO40.5g, yeast extract 0.3g dissolve in deionized water, are configured to required culture medium solution, and adjusting pH is 7,125
Colloid bacillus cereus is seeded in cooling culture medium solution by high-temperature sterilization 25min at DEG C, the shaken cultivation 12h at 35 DEG C, vibration
Swinging frequency is 170r/min, and incubation time is for 24 hours；
(2) by cultured bacterium solution high speed centrifugation 10min, centrifuge speed 8000rpm, temperature control is at 4 DEG C, removing
After the culture medium substance of upper layer plus deionized water, it is subsequently placed in freeze drier that bacterium powder is dried in -10 DEG C is spare；
(3) colloid bacillus cereus bacterium powder is formulated as 0.5g/mL bacterium solution, hydrophilic thickeners alginic acid is added into bacterium solution
Sodium, the concentration of hydrophilic thickeners is 0.3g/mL in bacterium solution；The bacterial strain concentration repaired in liquid at this time is about 109cell/mL；
(4) the acetic acid pretreatment fluid for preparing pH=5, sprays a treatment fluid in standard cement mortar time surface, 10min
Twice of reparation liquid is sprayed afterwards, is spaced 5min；
(5) by the test specimen surrounding after coating processing with adhesive tape ring around and using pressure fracture and inlay respectively 0.2mm,
The steel wire of 0.4mm, 0.6mm diameter precasts the crack of respective width, and then test specimen is placed in standard concrete fog room and is supported
Shield.
Record and test the repairing effect that 5d, 10d, 20d and 30d repair age, repairing test the result shows that, in 5d
It is settled out a large amount of calcium carbonate at cement-based material crack, after continuous repair 30d, averagely splits width 0.4mm microcrack below
It can achieve complete reparation, as shown in Figs. 1-3.
Embodiment 2
(1) sucrose 12g, Na are weighed2HPO4·12H2O 3g、MgSO4 0.6g、CaCO3 0.8g、KCl 0.3g、(NH4)2SO40.3g, yeast extract 0.2g dissolve in deionized water, are configured to required culture medium solution, and adjusting pH is 8,
High-temperature sterilization 25min at 125 DEG C, colloid bacillus cereus is seeded in cooling culture medium solution, the shaken cultivation at 35 DEG C
12h, frequency of oscillation 170r/min, incubation time is for 24 hours；
(2) by cultured bacterium solution high speed centrifugation 10min, centrifuge speed 8000rpm, temperature control is at 4 DEG C, removing
After the culture medium substance of upper layer plus deionized water, it is subsequently placed in freeze drier that bacterium powder is dried in -10 DEG C is spare；
(3) colloid bacillus cereus bacterium powder is formulated as 1.0g/mL bacterium solution, hydrophilic thickeners alginic acid is added into bacterium solution
Sodium, the concentration of hydrophilic thickeners is 0.5g/mL in bacterium solution, and the bacterial strain concentration repaired in liquid at this time is about 1010cell/mL；
(4) the acetic acid pretreatment fluid for preparing pH=5, sprays a treatment fluid in standard cement mortar time surface, 10min
Twice of reparation liquid is sprayed afterwards, is spaced 5min；
(5) by the test specimen surrounding after coating processing with adhesive tape ring around and using pressure fracture and inlay respectively 0.2mm,
The steel wire of 0.4mm, 0.6mm diameter precasts the crack of respective width, and then test specimen is placed in standard concrete fog room and is supported
Shield.
Record and test the repairing effect that 5d, 10d, 20d and 30d repair age, repairing test the result shows that, in 5d
It is settled out a large amount of calcium carbonate at cement-based material crack, after continuous repair 30d, averagely splits width 0.4mm microcrack below
It can achieve complete reparation.
Embodiment 3
(1) sucrose 11g, Na are weighed2HPO4·12H2O 2g、MgSO4 0.6g、CaCO3 1.5g、KCl 0.3g、(NH4)2SO40.6g, yeast extract 0.4g dissolve in deionized water, are configured to required culture medium solution, and adjusting pH is 7,
High-temperature sterilization 25min at 125 DEG C, colloid bacillus cereus is seeded in cooling culture medium solution, the shaken cultivation at 35 DEG C
12h, frequency of oscillation 170r/min, incubation time is for 24 hours；
(2) by cultured bacterium solution high speed centrifugation 10min, centrifuge speed 8000rpm, temperature control is at 4 DEG C, removing
After the culture medium substance of upper layer plus deionized water, it is subsequently placed in freeze drier that bacterium powder is dried in -10 DEG C is spare；
(3) colloid bacillus cereus bacterium powder is formulated as 0.8g/mL bacterium solution, hydrophilic thickeners alginic acid is added into bacterium solution
Sodium, the concentration of hydrophilic thickeners is 0.8g/mL in bacterium solution, and the bacterial strain concentration repaired in liquid at this time is about 1010cell/mL；
(4) the acetic acid pretreatment fluid for preparing pH=5, sprays a treatment fluid in standard cement mortar time surface, 10min
Twice of reparation liquid is sprayed afterwards, is spaced 5min；
(5) by the test specimen surrounding after coating processing with adhesive tape ring around and using pressure fracture and inlay respectively 0.2mm,
The steel wire of 0.4mm, 0.6mm diameter precasts the crack of respective width, and then test specimen is placed in standard concrete fog room and is supported
Shield.
Record and test the repairing effect that 5d, 10d, 20d and 30d repair age, repairing test the result shows that, in 5d
It is settled out a large amount of calcium carbonate at cement-based material crack, after continuous repair 30d, averagely splits width 0.4mm microcrack below
It can achieve complete reparation.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (4)
1. a kind of precoating surfaces method for cement-based material crack selfreparing, it is characterised in that: the following steps are included:
(1) bacterium solution will be configured to the immobilized colloid bacillus cereus bacterium powder of nutrients；
(2) hydrophilic thickeners are added into bacterium solution, obtain repairing liquid；Hydrophilic thickeners are sodium alginate；It is added to hydrophilic
Property thickener after in bacterium solution the concentration of hydrophilic thickeners be 0.3~0.8g/mL；After adding hydrophilic thickeners, repair in liquid
Bacterial strain concentration be 109~1010cell/mL；
(3) weak acid pretreatment fluid is prepared, sprays weak acid pretreatment fluid first to cement-based material surface before liquid is repaired in spraying；It is weak
Low-kappa number liquid is acetic acid；
(4) liquid is repaired in spraying after cement-based material surface sprays weak acid pretreatment fluid 10min.
2. the precoating surfaces method according to claim 1 for cement-based material crack selfreparing, it is characterised in that:
In step (1), the concentration of bacterium solution is 0.5~1.0g/mL.
3. the precoating surfaces method according to claim 1 for cement-based material crack selfreparing, it is characterised in that:
PH=5 of the weak acid pretreatment fluid.
4. the precoating surfaces method according to claim 1 for cement-based material crack selfreparing, it is characterised in that:
In step (4), spraying repairs liquid twice, and twice of spray time interval is 5min.
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| CN110863668B (en) * | 2019-11-13 | 2021-02-02 | 同济大学 | Microbial self-repairing method suitable for constructed reinforced concrete structure |
| CN111024692B (en) * | 2019-11-22 | 2022-03-08 | 东南大学 | Method for observing crack repair condition of microorganism self-repairing concrete |
| CN111170765B (en) * | 2020-01-07 | 2021-12-31 | 北京建中新材科技有限公司 | Multi-component concrete surface reinforcing agent and reinforcing method thereof |
| CN113216682B (en) * | 2021-05-20 | 2022-11-29 | 江苏大学 | Method for repairing vertical surface cracks in situ by using calcium carbonate precipitation induced by microorganisms |
| CN113307655B (en) * | 2021-05-31 | 2022-07-12 | 中建安装集团有限公司 | Cement-based external curing and internal protecting material and preparation method thereof |
| CN114197915B (en) * | 2022-01-12 | 2023-05-05 | 上海申继交通科技有限公司 | Minimally invasive self-healing waterproof method for roof |
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| CN102584073A (en) * | 2012-03-02 | 2012-07-18 | 东南大学 | Additive for crack self-repairing cement-base material, use method thereof and cement-base material |
| CN104261736A (en) * | 2014-09-15 | 2015-01-07 | 东南大学 | Preparation method of cement-based material having deep self-repairing function |
| CN104529217A (en) * | 2014-11-19 | 2015-04-22 | 同济大学 | Microbial composite additive used for cement-based material cracking self-repairing and applications thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102584073A (en) * | 2012-03-02 | 2012-07-18 | 东南大学 | Additive for crack self-repairing cement-base material, use method thereof and cement-base material |
| CN104261736A (en) * | 2014-09-15 | 2015-01-07 | 东南大学 | Preparation method of cement-based material having deep self-repairing function |
| CN104529217A (en) * | 2014-11-19 | 2015-04-22 | 同济大学 | Microbial composite additive used for cement-based material cracking self-repairing and applications thereof |
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