CN110156362A - A kind of cement-based material self repairing agent and its application by sulfate radical excitation - Google Patents
A kind of cement-based material self repairing agent and its application by sulfate radical excitation Download PDFInfo
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- CN110156362A CN110156362A CN201910358614.XA CN201910358614A CN110156362A CN 110156362 A CN110156362 A CN 110156362A CN 201910358614 A CN201910358614 A CN 201910358614A CN 110156362 A CN110156362 A CN 110156362A
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- cement
- based material
- repairing agent
- self repairing
- microcapsules
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0016—Granular materials, e.g. microballoons
- C04B20/002—Hollow or porous granular 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
- 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
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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 kind of cement-based material self repairing agent excited by sulfate radical and its applications.The cement-based material self repairing agent relies primarily on the microcapsules therein with sulfate radical response cracking and realizes selfreparing, self-repairing microcapsule volume is the 1 ~ 4% of cementitious material, microorganism self repairing agent is wrapped up in capsule, self repairing agent quality accounts for microcapsules quality 10% ~ 40%.The microcapsules cement-based material self repairing agent is added in cement-based material forming process, in concrete cracking, by the sulfate ion excitation in environment microcapsules are cracked, to discharge the microorganism self repairing agent in microcapsules；Microorganism generates carbonate by mineralization, it reacts to form the carbonate mineral with gelatification with the calcium ion in crack, the crack that cement-based material generates during military service is filled up, harmful ion is reduced and enters cement-based material, effectively increase cement-based material durability.
Description
Technical field
The invention belongs to civil engineering materials and microbiology interdisciplinary science technical field, and in particular to one kind is by sulfate radical
The cement-based material self repairing agent of excitation and its application.
Background technique
Cement-based material is still the maximum material of usage amount in society as a kind of important construction material.With building
Industry is built to the high request of building life and the energy-saving and emission-reduction demand of cement base industry itself, the durability of cement-based material be as
Modern important research direction.However, the influence of the brittleness and Service Environment of cement-based material itself, makes opening for cement-based material
It splits inevitable；If failing to be repaired in time after cracking, outside water and etching medium will constantly from System of Detecting Surface Defects For Material by
It gradually penetrates into, the deterioration of cement-based material is finally caused to accelerate.Therefore, the crack for repairing cement-based material is to extend cement matrix
Expect one of the important means of service life, nearly ten years, the repairing of cement-based material is carried out due to having using microbial mineralization technology
Good prospect and be concerned.Under suitable condition, most of bacteriums can induce the precipitating of carbonate, therefore, micro-
Biology induces carbonate deposition (MICP) and is just widely used in applications in civil engineering.The principle of microorganism self-healing concrete be
Carbonate deposition bacterium, nutriment and precipitating presoma are added in concrete in whipping process.After cracking, crack surfaces/week
The bacterium enclosed will be activated, and precipitate C aCO3With healed cracks, this technology is not only advantageous to promote the strong of cement-based material
Degree, durability can also fill crack, and cement-based material is helped to realize the effect of selfreparing.
In macroscopical concrete when microbe selfreparing, the lot of challenges faced, as the pH in concrete is up to
12.5~13, this is an exacting terms for bacterium.Further, since the continuous progress of aquation, cement base matrix is gradually
As fine and close structure.Under long-age, most of aperture is less than 0.5 μm, and bacterium size is within the scope of 1~3 μm of m.Therefore, matrix
Interior bacterium is probably extruded and crushes.In view of these conditions, influenced to protect bacterium not by mal-condition, most
It is good that bacterium is encapsulated before addition, seem extremely urgent for the exploitation of carrier.
Summary of the invention
In view of the deficiencies of the prior art, the purpose of the present invention is to provide a kind of cement-based materials excited by sulfate radical certainly
Renovation agent and its application, the self repairing agent include the self-repairing microcapsule with sulfate ion responsiveness；The micro- glue of the selfreparing
Include the self repairing agent of microorganism base in capsule, eco-compatibility is good, and the cement-based material self repairing agent method of administration it is simple and
Later period does not need manual intervention, can timeliness remedial cement based material crack.
To solve the deficiencies in the prior art, the technical scheme adopted by the invention is as follows:
A kind of cement-based material self repairing agent excited by sulfate radical, the self repairing agent are with the micro- of sulfate radical response cracking
Capsule realizes selfreparing, and the microcapsules volume is the 1-4% of cementitious material quality；Microorganism is wrapped up in the microcapsules to review one's lessons by oneself
Multiple agent, quality account for the 10-40% of microcapsules quality；The microorganism self repairing agent is made of bacterial strain and soluble calcium source,
The ability that there is the bacterial strain mineralising to generate carbonate.
Be as improved, microcapsules be barium alginate base hydrogel, microcapsules by the sulfate radical in environment from
When son excitation, it may occur that destroy and crack, to discharge microorganism self repairing agent therein.
It is that the bacterial strain is colloid bacillus cereus, Alkaliphilic bacillus or the spherical shape of bacillus as improved
One or more mixing in bacillus.
It is that the sulfate ion excitation concentration is greater than 0.02mol/L as improved.
It is that the cement-based material self repairing agent uses under normal temperature environment as improved.
It is that the cement-based material is the composite gel material based on cement, the plural gel material as improved
It further include flyash, miberal powder or metakaolin in material.
It is that the solubility calcium source is one in calcium nitrate, calcium lactate, calcium formate, calcium acetate or calcium chloride as improved
Kind or it is a variety of compound.
Application based on above-mentioned self-repairing cement-base material in maintenance cement-based material.
The utility model has the advantages that
Compared with prior art, present invention has an advantage that
1, different from previous self-repairing cement-base material, self-repairing cement-base material provided by the invention can be by environment
Sulfate radical excites and discharges self repairing agent, to realize crack autogenous healing, also has to lower sulfate ion concentration environment
Good responsiveness；
2, come from other inorganic admixtures of incorporation or the realization cement-based material selfreparings such as organic adhesion agent are different, in the present invention
The self repairing agent of encapsulation is microorganism base self repairing agent；It can be extended certainly using microcapsules protection microorganism self repairing agent
The duration of repairing performance；
3, the present invention is acted on by microbial mineralization to realize crack autogenous healing, is formed by the carbonate mine with gelatification
Object, mineralogical stabiliser is good, water resistance is strong, can effectively fill up the crack that cement-based material generates during military service.
Detailed description of the invention
Fig. 1 is barium alginate base self-repairing microcapsule of the microorganism self repairing agent volume at 40%；
It in sodium sulfate concentration is the broken cracking situation in 0.03mol/L environment that Fig. 2, which is barium alginate base self-repairing microcapsule,；
Fig. 3 is cementitious material (cement) and sand amount ratio is 1:3, when microcapsules volume accounts for the 1% of cementitious material, test specimen crack 14
Reparation situation after it, before (a) is repaired, after (b) repairing.
Specific embodiment
The object of the present invention is to provide a kind of cement-based material by sulfate ion excitation selfreparing in environment, the cement
Sill includes the self-repairing microcapsule with sulfate ion responsiveness；Reviewing one's lessons by oneself comprising microorganism base in self-repairing microcapsule
Multiple agent.Eco-compatibility is good, and the cement-based material self repairing agent method of administration is simple and the later period does not need manual intervention, can and
When property remedial cement based material crack.
The microcapsules comprising microorganism self repairing agent of certain volume are added in cement-based material molding whipping process, from
And cement-based material test specimen after molding is prepared, ventilation maintenance is carried out under room temperature environment, finally observes cement-based material examination
The self-healing effect of part.
Bacillus used in the present invention specifically includes colloid from Chinese industrial Microbiological Culture Collection administrative center
Bacillus, Alkaliphilic bacillus, Bacillus sphaericus.
Embodiment 1
A kind of cement-based material self repairing agent excited by sulfate radical, which is suitable under normal temperature environment, described to review one's lessons by oneself
Multiple agent is that the microcapsules with sulfate radical response cracking realize selfreparing, and the microcapsules volume is the 1% of cementitious material quality；
Microorganism self repairing agent is wrapped up in the microcapsules, microorganism self repairing agent quality accounts for the 10% of microcapsules quality；Micro- life
Object self repairing agent is made of colloid bacillus cereus and soluble calcium source, mass ratio 1:10.The solubility calcium source group is nitre
Sour calcium.
The preparation method of the above-mentioned cement-based material self repairing agent excited by sulfate radical, comprising the following steps:
(1) colloid bacillus cereus and calcium nitrate are mixed, is stirred evenly, it is ensured that slurry is not stratified；
(2) microcapsules of the hydrogel of barium alginate base are prepared by orifice method；
(3) microcapsules obtained are placed in 35 DEG C of baking oven and are dried to get cement-based material self repairing agent.
Above-mentioned self repairing agent is used in cement-based material test specimen, cement-based material test specimen is prepared under 25 DEG C of environment,
Cement and sand are added in tap water, cement quality are added in whipping process by middle cement 450g, sand 1350g, tap water 225g
1% self repairing agent, stirring form to obtain test specimen.
Crack is manufactured after standard curing 7d, test specimen is placed under the conditions of environment temperature is 25 DEG C and carries out immersion ventilation maintenance,
Environment sulfate ion concentration is 0.03mol/L, is imitated after conserving 14d by microscopic Crack Self-healing in Cementitious Materials
Fruit, as a result as shown in figure 3, area repair rate is close to 98%.
Embodiment 2
A kind of cement-based material self repairing agent excited by sulfate radical, which is suitable under normal temperature environment, described to review one's lessons by oneself
Multiple agent is that the microcapsules with sulfate radical response cracking realize selfreparing, and the microcapsules volume is the 1% of cementitious material quality；
Microorganism self repairing agent is wrapped up in the microcapsules, microorganism self repairing agent quality accounts for the 10% of microcapsules quality；Micro- life
Object self repairing agent is made of colloid bacillus cereus and soluble calcium source.The solubility calcium source group is that calcium chloride and calcium lactate mix
It forms.
Above-mentioned self repairing agent is used in cement-based material test specimen, cement-based material test specimen is prepared under 25 DEG C of environment,
Cement and sand are added in tap water, cement quality are added in whipping process by middle cement 450g, sand 1350g, tap water 225g
1% self repairing agent, stirring form to obtain test specimen.
Crack is manufactured after standard curing 7d, test specimen is placed under the conditions of environment temperature is 25 DEG C and carries out immersion ventilation maintenance,
Environment sulfate ion concentration is 0.1mol/L, passes through microscopic Crack Self-healing in Cementitious Materials effect after conserving 14d,
Area repair rate is close to 95%.
Embodiment 3
A kind of cement-based material self repairing agent excited by sulfate radical, which is suitable under normal temperature environment, described to review one's lessons by oneself
Multiple agent is that the microcapsules with sulfate radical response cracking realize selfreparing, and the microcapsules volume is the 1% of cementitious material quality；
Microorganism self repairing agent is wrapped up in the microcapsules, microorganism self repairing agent quality accounts for the 30% of microcapsules quality；Micro- life
Object self repairing agent is made of colloid bacillus cereus and soluble calcium source, mass ratio 1:10.
Above-mentioned self repairing agent is used in cement-based material test specimen, cement-based material test specimen is prepared under 20 DEG C of environment,
Middle low calcium cementitious material (mixed with a large amount of Class F fly ash in cementitious material) 450g, sand 1350g, tap water 225g, by cement and
Sand is added in tap water, and the self repairing agent of cement quality 1% is added in whipping process, and stirring forms to obtain test specimen.
Crack is manufactured after standard curing 7d, test specimen is placed under the conditions of environment temperature is 20 DEG C and carries out immersion ventilation maintenance,
Environment sulfate ion concentration is 0.1mol/L, passes through microscopic Crack Self-healing in Cementitious Materials effect after conserving 14d,
Area repair rate is close to 90%.
Embodiment 4
A kind of cement-based material self repairing agent excited by sulfate radical, which is suitable under normal temperature environment, described to review one's lessons by oneself
Multiple agent is that the microcapsules with sulfate radical response cracking realize selfreparing, and the microcapsules volume is the 1% of cementitious material quality；
Microorganism self repairing agent is wrapped up in the microcapsules, microorganism self repairing agent quality accounts for the 40% of microcapsules quality；Micro- life
Object self repairing agent is made of Alkaliphilic bacillus and calcium lactate.
Above-mentioned self repairing agent is used in cement-based material test specimen, cement-based material test specimen is prepared under 25 DEG C of environment,
Cement and sand are added in tap water, cement quality are added in whipping process by middle cement 450g, sand 1350g, tap water 225g
1% self repairing agent, stirring form to obtain test specimen.
Crack is manufactured after standard curing 28d, test specimen is placed under the conditions of environment temperature is 25 DEG C and carries out immersion ventilation maintenance,
Environment sulfate ion concentration is 0.1mol/L, passes through microscopic Crack Self-healing in Cementitious Materials effect after conserving 14d,
Area repair rate is close to 90%.
Embodiment 5
A kind of cement-based material self repairing agent excited by sulfate radical, which is suitable under normal temperature environment, described to review one's lessons by oneself
Multiple agent is that the microcapsules with sulfate radical response cracking realize selfreparing, and the microcapsules volume is the 1% of cementitious material quality；
Microorganism self repairing agent is wrapped up in the microcapsules, microorganism self repairing agent quality accounts for the 10% of microcapsules quality；Micro- life
Object self repairing agent is made of colloid bacillus cereus and soluble calcium source.
Above-mentioned self repairing agent is used in cement-based material test specimen, cement-based material test specimen is prepared under 25 DEG C of environment,
Cement and sand are added in tap water, cement quality are added in whipping process by middle cement 450g, sand 1350g, tap water 225g
1% self repairing agent, stirring form to obtain test specimen.
Crack is manufactured after standard curing 60d, test specimen is placed under the conditions of environment temperature is 25 DEG C and carries out immersion ventilation maintenance,
Environment sulfate ion concentration is 0.1mol/L, passes through microscopic Crack Self-healing in Cementitious Materials effect after conserving 14d,
Area repair rate is close to 89%.
The sulfate ion response type self-repairing cement-base material, reparation product fracture filling effect is preferable, has preferably
Self-reparing capability.
The foregoing is only a preferred embodiment of the present invention, the scope of protection of the present invention is not limited to this, it is any ripe
Know those skilled in the art within the technical scope of the present disclosure, the letter for the technical solution that can be become apparent to
Altered or equivalence replacement are fallen within the protection scope of the present invention.
Claims (8)
1. a kind of cement-based material self repairing agent excited by sulfate radical, it is characterised in that: the self repairing agent is with sulfuric acid
The microcapsules of root response cracking realize selfreparing, and the microcapsules volume is the 1-4% of cementitious material quality；In the microcapsules
Microorganism self repairing agent is wrapped up, quality accounts for the 10-40% of microcapsules quality；The microorganism self repairing agent is by bacterial strain and can
Dissolubility calcium source composition, the ability that there is the bacterial strain mineralising to generate carbonate.
2. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, it is characterised in that: micro- glue
Capsule is the hydrogel of barium alginate base.
3. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, it is characterised in that: described
Bacterial strain be the colloid bacillus cereus of bacillus, one or more mixing in Alkaliphilic bacillus or Bacillus sphaericus.
4. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, it is characterised in that: described
Sulfate ion excitation concentration be greater than 0.02mol/L.
5. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, it is characterised in that: described
Cement-based material self repairing agent uses under normal temperature environment.
6. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, it is characterised in that: described
Cement-based material is the composite gel material based on cement, further includes flyash, miberal powder or inclined in the composite gel material
Kaolin.
7. a kind of cement-based material self repairing agent excited by sulfate radical according to claim 1, which is characterized in that described
Soluble calcium source is one or more compound in calcium nitrate, calcium lactate, calcium formate, calcium acetate or calcium chloride.
8. based on it is described in claim 1 it is a kind of by sulfate radical excite cement-based material self repairing agent maintenance cement-based material
Middle application.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111056799A (en) * | 2019-12-27 | 2020-04-24 | 北京东方雨虹防水技术股份有限公司 | Hydrogel-encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method |
| WO2023065628A1 (en) * | 2021-10-21 | 2023-04-27 | 江苏科技大学 | Marine concrete additive and preparation method therefor and use thereof |
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Cited By (3)
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| CN111056799A (en) * | 2019-12-27 | 2020-04-24 | 北京东方雨虹防水技术股份有限公司 | Hydrogel-encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method |
| CN111056799B (en) * | 2019-12-27 | 2022-04-19 | 北京东方雨虹防水技术股份有限公司 | Hydrogel-encapsulated bacterial spore self-repairing material with pH responsiveness and cement-based concrete self-repairing method |
| WO2023065628A1 (en) * | 2021-10-21 | 2023-04-27 | 江苏科技大学 | Marine concrete additive and preparation method therefor and use thereof |
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Application publication date: 20190823 |