CN110143789A - A kind of self-repair concrete and preparation method thereof - Google Patents
A kind of self-repair concrete and preparation method thereof Download PDFInfo
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- CN110143789A CN110143789A CN201910284720.8A CN201910284720A CN110143789A CN 110143789 A CN110143789 A CN 110143789A CN 201910284720 A CN201910284720 A CN 201910284720A CN 110143789 A CN110143789 A CN 110143789A
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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
- 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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- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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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)
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- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention provides a kind of self-repair concretes and preparation method thereof, when there is crack in concrete, it builds to form reticular structure between regeneration PP staple fiber, to reduce the number of crack generation, and there is certain drawing-resistant function between PP staple fiber, crack can be prevented further to develop, so that the density of regeneration concrete structure is further improved；Water and air enters crack simultaneously, bring back to life the bacterial spore in kaolin interlayer dormant state, it decomposes the calcium lactate in kaolin and then generates calcium carbonate, gathered in crack with this, grown, pass through chemical bonds between adjacent calcium carbonate crystal, calcium carbonate occurs to be chemically bonded and then be bonded together with the hydroxyl of cement and aggregate surface, crack is gradually just sealed, is repaired, it is finally reached the selfreparing of concrete, it does not need to spend a large amount of manpower and material resources that can achieve the purpose that repair comprehensively, be with a wide range of applications.
Description
Technical field
The present invention relates to concrete fields, and in particular to a kind of self-repair concrete and preparation method thereof.
Background technique
Concrete is firm, durable and relatively cheap, is most commonly used construction material in the world.However, the presence in crack
Durability and its safety of concrete structure can be reduced.Microcrack is almost the inevitable feature of normal concrete.These
Crack not only influences the integrality of concrete structure, but also water and chemical substance can infiltrate into inside concrete by crack,
So that microcrack is formed a continuous network, substantive influence is generated to the permeability of concrete, to make concrete to invading
The resistivity decline that corrosion substance enters, such as water and chemical substance can be caused by crack permeating corrosion concrete substrates
Steel bar corrosion, accelerating structure aging, and then shorten service life.
And not all initial micro-crack can all develop into harmful or unstable crackle.Many research reports, certain
In the case of, the small crack in concrete can heal.This phenomenon is referred to as " self-healing " of concrete.The main reason for self-healing
It is considered as the process based on chemistry, physics and machinery.It is reported that precipitation of calcium carbonate is the most important of influence autogenous healing
Factor.Other than the self healing of concrete, crack can also be repaired by the way that specific consolidant is added in matrix.For
The self-healing ability of concrete is improved, there has been proposed various consolidants, most of consolidants are chemicals,
Nearest bacterium is also studied by a part of scholar as self-healing agent.
Method currently used for distress in concrete reparation mainly include surface preparation, leak stopping method, completion method, grouting method,
Structural strengthening method etc..These methods can realize the reparation of distress in concrete under certain condition, but all there is respective lack
Point.Surface preparation can only repair the surface layer in crack, and repairing effect is poor, and price is generally more expensive；Leak stopping method often uses asphalt mixtures modified by epoxy resin
The chemical materials such as rouge, poly- propylhomoserin, these materials are different from the thermal expansion coefficient of cement-based material, and compatibility is poor, and a part
Chemical classes material has certain environmental contamination；Completion method has damage structure, is not suitable for concrete primary structure member；It fills
Slurry processes technique is more demanding, and integral strength is low；Structural strengthening and repairing method is complicated for operation, higher cost.So there is still a need for find more
Add excellent distress in concrete restorative procedure.
Summary of the invention
Above-mentioned conventional repair method takes a series of remedial measure again after mainly artificially observing cracking initiation
Crack is repaired, not only to expend a large amount of manpower and material resources, but also some inevitable cracks are difficult to be found, and go out for concrete
Existing crack and cause its structure durability and safety to go wrong, and a kind of self-repair concrete be provided and preparation method thereof.
The technical scheme adopted by the invention is that:
A kind of self-repair concrete, including following raw material composition:
Further, its ratio of mud of the self-repair concrete is 0.37~0.42, and sand coarse aggregate ratio is 35~40%.
Further, the coarse aggregate is continuous grading rubble, and 5~15mm of granular size, the fine aggregate is river sand,
Fineness modulus 2.3~2.6.
Further, the repair materials are the kaolin containing calcium lactate and bacterial spore.
Further, the preparation method of the repair materials is to use contain calcium lactate, yeast extract in a vacuum
Mixed aqueous solution kaolin is impregnated twice, every time impregnate 6h or more, then again with bacterial spore suspension to kaolin
10~20min of dipping is carried out, after each impregnation, by kaolin at lower drying 5 days or more of 37 DEG C, that is, obtains and repairs material
Material --- the kaolin containing calcium lactate and bacterial spore.
Further, the mass fraction of calcium lactate is in the mixed aqueous solution of the calcium lactate, yeast extract
6.5%~8.5%, the mass fraction of yeast extract is 0.08%~0.12%, and the bacterial spore suspension concentration is
107CFU/mL, bacterium are bacillus.
Further, the regeneration PP staple fiber is PP broken material by melting, spinning gained, fibre length 0.5
~19cm.
Further, the miberal powder is one or both of flyash, silicon ash.
Further, the water-reducing agent is poly carboxylic acid series water reducer.
The present invention also provides a kind of preparation methods of self-repair concrete, specifically comprise the following steps:
(1) preparation of repair materials: being in a vacuum 6.5%~8.5% calcium lactate, quality point with containing mass fraction
Number is that the mixed aqueous solution of 0.08%~0.12% yeast extract impregnates twice kaolin, impregnates 6h or more every time,
Then 10~20min of dipping is carried out to kaolin with bacterial spore suspension again, after each impregnation, by kaolin at 37 DEG C
Lower drying 5 days or more to get the kaolinic repair materials containing calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It in small mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get selfreparing coagulation
Soil.
Advantageous effects: the present invention provides a kind of self-repair concrete, the miberal powder of addition is to reduce concrete
Alkalinity be suitble to bacterial spore existence；Kaolin is intumescent book clay, protects matrix not using it as bacterial spore
Internal reservoir is only represented, the survival ability of bacterial spore can also be increased, and constitutes the structural element of concrete；When mixed
It when crack occurs in solidifying soil, regenerates and builds to form reticular structure between PP staple fiber, to reduce the number of crack generation, and PP
There is certain drawing-resistant function between staple fiber, crack can be prevented further to develop, so that the density of regeneration concrete structure
It is further improved；Water and air enters crack simultaneously, brings back to life the bacterial spore in kaolin interlayer dormant state,
Decompose kaolin in calcium lactate so that generate calcium carbonate, gathered in crack with this, grown, adjacent calcium carbonate crystal it
Between by chemical bonds, calcium carbonate and the hydroxyl of cement and aggregate surface occur to be chemically bonded to be bonded together in turn, crack
It gradually just sealed, repaired, be finally reached the selfreparing of concrete, do not need to spend a large amount of manpower and material resources that can reach complete
The purpose that face is repaired, is with a wide range of applications.
Specific embodiment
The present invention is further described below in conjunction with specific embodiment, but does not limit the scope of the invention.
Portland cement rank used is 42.5 grades.
Embodiment 1
Self-repair concrete the preparation method is as follows:
(1) preparation of repair materials: in a vacuum with containing mass fraction be 8.5% calcium lactate, mass fraction is
The mixed aqueous solution of 0.12% yeast extract impregnates twice kaolin, impregnates 7h every time, then uses bacterial spore again
Suspension carries out dipping 20min to kaolin, after each impregnation, by kaolin in 37 DEG C of lower drying 6 days to get containing
The kaolinic repair materials of calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It is put into fog room and is conserved for 24 hours in small mold, after jolt ramming, remove mold and be numbered, then dislocation curing box carries out standard and supports
Shield is to get self-repair concrete.
Embodiment 2
Self-repair concrete the preparation method is as follows:
(1) preparation of repair materials: in a vacuum with containing mass fraction be 7.5% calcium lactate, mass fraction is
The mixed aqueous solution of 0.09% yeast extract impregnates twice kaolin, impregnates 7h every time, then uses bacterial spore again
Suspension carries out dipping 15min to kaolin, after each impregnation, by kaolin in 37 DEG C of lower drying 6 days to get containing
The kaolinic repair materials of calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It in small mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get selfreparing coagulation
Soil.
Embodiment 3
Self-repair concrete the preparation method is as follows:
(1) preparation of repair materials: being in a vacuum 7% calcium lactate, mass fraction 0.12% with containing mass fraction
The mixed aqueous solution of yeast extract impregnates twice kaolin, impregnates 8h every time, then uses bacterial spore suspension pair again
Kaolin carries out dipping 20min, after each impregnation, by kaolin in 37 DEG C of lower drying 7 days to get containing calcium lactate
With the kaolinic repair materials of bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It in small mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get selfreparing coagulation
Soil.
Embodiment 4
Self-repair concrete the preparation method is as follows:
(1) preparation of repair materials: in a vacuum with containing mass fraction be 6.5% calcium lactate, mass fraction is
The mixed aqueous solution of 0.08% yeast extract impregnates twice kaolin, impregnates 9h every time, then uses bacterial spore again
Suspension carries out dipping 20min to kaolin, after each impregnation, by kaolin in 37 DEG C of lower drying 8 days to get containing
The kaolinic repair materials of calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It in small mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get selfreparing coagulation
Soil.
Embodiment 5
Wherein silicon ash and the adding proportion of flyash in parts by weight are silicon ash: flyash=1:2.
The ratio of mud is 0.4, sand coarse aggregate ratio 38.1%.
Self-repair concrete the preparation method is as follows:
(1) preparation of repair materials: in a vacuum with containing mass fraction be 7.5% calcium lactate, mass fraction is
The mixed aqueous solution of 0.1% yeast extract impregnates twice kaolin, impregnates 7h every time, then uses bacterial spore again
Suspension carries out dipping 10min to kaolin, after each impregnation, by kaolin in 37 DEG C of lower drying 6 days to get containing
The kaolinic repair materials of calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；By the reparation of surplus stock and step (1)
Material pours into inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified big
It in small mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get selfreparing coagulation
Soil.
Comparative example 1
This comparative example is formed with embodiment 5 and preparation method is identical, the difference is that being not added with silicon ash and flyash.
Comparative example 2
This comparative example is formed with embodiment 5 and preparation method is identical, the difference is that being not added with regeneration PP staple fiber.
Comparative example 3
This comparative example is formed with embodiment 5 and preparation method is identical, the difference is that being not added with repair materials.
Standard curing 56 days after concrete formation, are then tested for the property each embodiment.
Test carries out in accordance with the following methods:
(1) quickly chloride ion transport coefficient test: using GB/T 50082-2009 " normal concrete long-term behaviour and resistance to
Long method for testing performance " standard method test.
(2) intensity test: compression strength is according to GB/T 50107-2010 " test of concrete strength review approach ".
Test result is shown in Table 1.
1 self-repair concrete performance test table of table
Self-repair concrete of the invention, the miberal powder of addition are to reduce the alkalinity of concrete to be suitble to bacterial spore
Existence；Kaolin is intumescent book clay, and the protection matrix using it as bacterial spore not only represents internal reservoir, also
The survival ability of bacterial spore can be increased, and constitute the structural element of concrete；When there is crack in concrete, regeneration
It builds to form reticular structure between PP staple fiber, to reduce the number of crack generation, and there is certain resist between PP staple fiber
Drawing effect, can prevent crack from further developing, so that the density of regeneration concrete structure is further improved；Simultaneously
Water and air enters crack, brings back to life the bacterial spore in kaolin interlayer dormant state, decomposes the calcium lactate in kaolin
And then calcium carbonate is generated, gathered in crack with this, grown, passes through chemical bonds, carbonic acid between adjacent calcium carbonate crystal
Calcium occurs to be chemically bonded and then be bonded together with the hydroxyl of cement and aggregate surface, and crack is gradually just sealed, repaired, most
Reach the selfreparing of concrete eventually.
By embodiment 5 compared with comparative example 1, silicon ash and flyash, quick chloride ion transport are not added in comparative example 1
Coefficient is big compared with embodiment 5, this is because the presence of silicon ash and flyash can improve concrete neutral and alkali environment, makes under alkalinity
Drop, is conducive to bacterial spore and survives, and since concrete alkalinity is larger so that the decline of bacterial spore survival rate, leads in comparative example 1
Cause repair materials that cannot play repair well, the crack of generation cracking cannot repair, and quick chloride ion is moved
It is big to move coefficient ratio embodiment 5, i.e., it is impervious poor.
By embodiment 5 compared with comparative example 2, due to being not added with regeneration PP staple fiber in comparative example 2, make the anti-of comparative example 2
Compressive Strength is lower, this is because be added in embodiment regeneration PP staple fiber after, regenerate PP staple fiber between build to be formed it is netted
Structure, to reduce the number of crack generation, while the drawing-resistant function between PP staple fiber can prevent the further hair in crack
Exhibition, so that the density of regeneration concrete structure is further improved.
By embodiment 5 compared with comparative example 3, repair materials are not added in comparative example 3, with the reality for being added to repair materials
Example 5 is applied to compare with comparative example 1, comparative example 2, quick chloride ion transport coefficient is maximum, although regeneration PP staple fiber there are energy
The number in crack is reduced to a certain extent, but if things go on like this crack still has, and by further expansion, does not repair
The presence of material, crack cannot repair, so that quick chloride ion transport coefficient is gradually increased in concrete, impermeability decline,
Compression strength decline, finally influences concrete structure durability and safety.
In conclusion self-repair concrete of the invention has preferable impervious, compression strength, the reparation material of addition
Material makes concrete have the autonomous ability for repairing crack.
Claims (10)
1. a kind of self-repair concrete, which is characterized in that formed including following raw material:
2. a kind of self-repair concrete according to claim 1, which is characterized in that its ratio of mud of the self-repair concrete
It is 0.37~0.42, sand coarse aggregate ratio is 35~40%.
3. a kind of self-repair concrete according to claim 1, which is characterized in that the coarse aggregate is that continuous grading is broken
Stone, 5~15mm of granular size, the fine aggregate are river sand, fineness modulus 2.3~2.6.
4. a kind of self-repair concrete according to claim 1, which is characterized in that the repair materials are to contain calcium lactate
With the kaolin of bacterial spore.
5. a kind of self-repair concrete according to claim 4, which is characterized in that the preparation method of the repair materials
To be impregnated twice with the mixed aqueous solution containing calcium lactate, yeast extract to kaolin in a vacuum, impregnating 6h every time
More than, 10~20min of dipping then is carried out after each impregnation to kaolin with bacterial spore suspension again, kaolin exists
Lower drying 5 days or more of 37 DEG C, i.e. acquisition repair materials --- the kaolin containing calcium lactate and bacterial spore.
6. a kind of self-repair concrete according to claim 5, which is characterized in that the calcium lactate, yeast extract
The mass fraction of calcium lactate is 6.5%~8.5% in mixed aqueous solution, the mass fraction of yeast extract is 0.08%~
0.12%, the bacterial spore suspension concentration is 107CFU/mL, bacterium are bacillus.
7. a kind of self-repair concrete according to claim 1, which is characterized in that the regeneration PP staple fiber is broken for PP
Material is by obtained by melting, spinning, fibre length is 0.5~19cm.
8. a kind of self-repair concrete according to claim 1, which is characterized in that the miberal powder is flyash, in silicon ash
One or two.
9. a kind of self-repair concrete according to claim 1, which is characterized in that the water-reducing agent is polycarboxylic-acid diminishing
Agent.
10. the preparation method of described in any item a kind of self-repair concretes according to claim 1~9, which is characterized in that specific
Include the following steps:
(1) preparation of repair materials: in a vacuum with containing mass fraction be 6.5%~8.5% calcium lactate, mass fraction is
The mixed aqueous solution of 0.08%~0.12% yeast extract impregnates twice kaolin, impregnates 6h or more every time, then
10~20min of dipping is carried out to kaolin with bacterial spore suspension again, it is after each impregnation, kaolin is lower dry at 37 DEG C
Dry 5 days or more to get the kaolinic repair materials containing calcium lactate and bacterial spore, for use；
(2) each raw material is weighed according to the ratio, water-reducing agent is soluble in water, for use；The repair materials of surplus stock and step (1) are fallen
Enter inside blender, first carries out dry mixing；
(3) water dissolved with water-reducing agent of step (2) is then added, then is stirred, the material being stirred is poured into unified size
It in mold, is put into fog room and is conserved for 24 hours after jolt ramming, then dislocation curing box carries out standard curing to get self-repair concrete.
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| CN111592302A (en) * | 2020-05-18 | 2020-08-28 | 上海昊丰混凝土有限公司 | Fiber concrete and preparation method thereof |
| CN112573866A (en) * | 2020-12-08 | 2021-03-30 | 成都精准混凝土有限公司 | Self-repairing concrete and preparation method and application thereof |
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| CN112573866A (en) * | 2020-12-08 | 2021-03-30 | 成都精准混凝土有限公司 | Self-repairing concrete and preparation method and application thereof |
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Application publication date: 20190820 |