CN104196131A - Method for plugging cast-in-situ concrete slab or base-plate crack with microbe-sedimented calcium carbonate - Google Patents
Method for plugging cast-in-situ concrete slab or base-plate crack with microbe-sedimented calcium carbonate Download PDFInfo
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Abstract
The invention discloses a method for plugging a cast-in-situ concrete slab or base-plate crack with microbe-sedimented calcium carbonate. The method includes preparation of plugging materials, plugging of the cast-in-situ concrete slab crack and plugging of the cast-in-situ base-plate crack. A method for preparation of the plugging materials includes preparation of calcium source solutions, preparation of nutrient salt solutions and preparation of microbial solutions; a method for plugging of the cast-in-situ concrete slab crack includes that the pressure grouting mode is adopted on base of the crack, the top surface and bottom surface of the plugged crack are sealed with rubber tapes, and water solutions are ensured to flow out with bacteria filtered within the crack; a rubber hose is inserted in the bottom of the other end of the crack, and an injector is connected with the rubber tube; the injector is utilized to inject the microbial solutions, the nutrient salt solutions and the calcium source solutions with the volume ratio of 1:1:1, and fluid is ensured to seep from the position of a gauze; grouting work is repeated once every 24 hours for 5 days; the gauge, the rubber tube, the injector and the sealing rubber tapes are removed. By the method, problems of durability of rusting and the like caused by exposure of steel bars inside plates can be effectively solved.
Description
Technical field
The present invention relates to a kind of Prevention Technique of cracks on concrete roofing board, especially a kind of microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab floor or base plate crack method.
Background technology
At present, along with the raising of people's living standard, to house, use the requirement of function also more and more higher.The house of large bay structure, when meeting comfortableness, also causes concrete floor to produce the common quality defect in crack, not only affects attractive in appearance, Ye Gei resident family brings sense of insecurity, also form the passage of seepage simultaneously, had a strong impact on use function, and caused many quality disputes.
In present stage residential project, a lot of places provide against and use prestressed porous plate, and Bars In Poured Concrete Slab has improved structural integrity and durability.Someone thinks superseded precast plate and adopts cast-in-situ floor just can control crack.In fact contrary, floor cracking phenomena is more general, and fracture pattern has more diversity.This is confirmed by the quality dispute occurring repeatedly.
The basic reason that concrete cast-in-place slab produces shrinkage crack is concrete volume-diminished during setting and harden in air, and fixed when its surrounding, particularly bearing wall produces constraint to plate, can produce tensile stress and cause crack in the time of can not free shrink.Along with popularizing of Concrete Pumping Technology and premixed concrete technology, concrete turns to concentrated stirring from the Site in past, from dry, low moving sexual deviation large fluidity pumping of concrete cast.In order to reach technological requirement, cement consumption increases, and water/binder ratio increases, and sand coarse aggregate ratio increases, and aggregate size reduces, and these factors have all been impelled a large amount of appearance of crack of reinforced concrete in situ plank.
Although say that concrete is to allow work with cracking, the crack causing because of reasons such as contractions does not affect structural safety.But the crack that some is larger, width is large, up/down perforation, has affected the durability of floor and attractive in appearance; Meanwhile, because resident family lacks corresponding professional knowledge, think that building has larger potential safety hazard more.In addition, the passage that the crack that basement bottom board occurs probably becomes ground water seepage, causes indoor humidity, ponding, mouldy, has affected the normal use of resident family.
For the shrinkage crack of concrete cast-in-place slab appearance, conventionally adopt the processing method of epoxy resin sealing, can stop air to enter inside concrete and cause that reinforcing bar gets rusty.But epoxy resin belongs to organic material, As time goes on easily aging, and also tack of materials is large, is difficult for pouring in tiny crack.
Microorganism induction tosca shutoff crack technology is exactly to arise at the historic moment in this case, and it is comprised of the biochemical reaction of series of complex: it is NH by urea decomposition that some basophilous microorganisms can utilize the urease self producing
3and CO
2, along with the increase of the ammonia quantity decompose generating can cause, the rising of pH in surrounding environment make CO
2in solution with CO
3 2-form exist.If at this moment there is Ca in the surrounding of bacterium
2+, electronegative organic monolayer film chelating Ca constantly in bacterial cell
2+, will cause calcium carbonate crystal deposition.
Before this new material solidifies, viscosity is very low, by negative pressure, may penetrate into depths, crack, not only utilize microbe deposition mineral matter to reach the effect of shutoff, and can automatically find the position of leakage to carry out effective antiseepage, reach and detect the effect two-in-one with shutoff, this seems particularly important in some complex environments.The stable in properties such as calcite of utilizing microorganism induction deposition to generate are good with the associativity of concrete material.Antiacid, the alkali resistant of the concrete material after reparation, freeze thawing resistance circulation, anti-carbonization and the ability such as impervious are all improved, and can not lose efficacy because of the aging of material.
The application of the Cheng Xiao of Tsing-Hua University brightness patent < < microorganism cause cement or concrete and production method and application > > (CN200810105947.3), propose to utilize the fluid,matching that can produce the Pasteur bacillus bacterium liquid of urase and contain urea and mineral calcium salt to mix, reaction under certain condition gets final product to obtain microorganism cause cement or concrete method, but does not provide especially the method specifically mending a split about cracks on concrete roofing board.
Chinese patent application 200810019165.8 discloses a kind of microorganism reparation method for recovering cement-based material crack and nutrient solution and reparation nutrient solution of utilizing.It adopts microbial inoculum and repairs in nutrient solution injected water mudstone crack, carries out maintenance.But the method useless relating to, injected concrete grammar, the step in crack by bacterium liquid and reparation nutrient solution.
Jia Qiang (ZL201110412162.2) (ZL201110413188.9) utilizes this principle to carry out shutoff to Cracked Concrete with " method of sealing vertical cracks of basement concrete structures by using microbial grouting " in patent " method of plugging horizontal fissures of basement concrete structure by grouting microorganisms " just, but the method is the shutoff that the wall body slit for concrete basement carries out, and upper on the horizontal members such as cast-in-situ floor and basement bottom board, lower through crack not yet proposes effective treating method, and the calcium chloride solution adopting is that calcium source easily causes the corrosion of steel bar in concrete.
Summary of the invention
The object of the invention is the problem that concrete cast-in-place slab easily produces shrinkage crack, utilize microbiological precipitation of CaCO 3 technology, a kind of microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab floor or base plate crack method are provided.
For achieving the above object, the present invention adopts following technical proposals:
A method for microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab cracks on floor slab, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; The present invention selects calcium nitrate (Ca (NO
3)
2) solution or calcium acetate (Ca (CH
3cOO)
2) solution, concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, the present invention selects urea (CO (NH
2)
2) solution, concentration is 1mol/L;
(3) preparation of microorganism, the present invention adopts Pasteur bacillus, adopts fermentation tank culture.In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L.Wherein yeast extract (organic nitrogen source) and ammonium sulfate (inorganic nitrogen-sourced) is for bacterial growth provides nutrition, the adjustable solution acid alkalinity of NaOH (PH=9), and nickel chloride is as catalyzer and accelerate the growth of bacterium.With liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution.Incubation time is set as 20h, and Temperature Setting is 30 ℃, and for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; Cultivation finishes the rear enzymatic activity OD600 with conductivity method detection bacterium liquid and is greater than 1.
The shutoff of B, Pouring Concrete Floor Slab Crack
Because end face and the bottom surface in cast-in-situ floor crack can provide construction space for shutoff, be the density that guarantees shutoff, the present invention adopts the mode of crack base pressure perfusion to operate:
(1) for preventing that calcium source solution, nutrient salt solution and bacterium liquid that the cementation of fissures is used run off, and seal with adhesive tape in end face and the bottom surface of through crack.In the wide scope of the about 1cm in end face one end, crack, with gauze, seal, can guarantee that the aqueous solution flows out and bacterium is filtered in crack.In crack other end bottom, insert sebific duct, syringe is connected with sebific duct.
(2) with syringe, in crack, inject bacterium liquid, nutrient salt solution and calcium source solution respectively.Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze place has liquid to ooze out.
(3) slip casting work repeats once at interval of 24h, continues 5 days.
(4) remove the adhesive tape of gauze, sebific duct, syringe and sealing.
The method in micro-raw deposition calcium carbonate blocking concrete Bars In Poured Concrete Slab base plate crack, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; The present invention selects calcium nitrate (Ca (NO
3)
2) solution or calcium acetate (Ca (CH
3cOO)
2) solution, concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, the present invention selects urea (CO (NH
2)
2) solution, concentration is 1mol/L;
(3) preparation of microorganism, the present invention adopts Pasteur bacillus, adopts fermentation tank culture.In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L.Wherein yeast extract (organic nitrogen source) and ammonium sulfate (inorganic nitrogen-sourced) is for bacterial growth provides nutrition, the adjustable solution acid alkalinity of NaOH (PH=9), and nickel chloride is as catalyzer and accelerate the growth of bacterium.With liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution.Incubation time is set as 20h, and Temperature Setting is 30 ℃, and for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; Cultivation finishes the rear enzymatic activity OD600 with conductivity method detection bacterium liquid and is greater than 1.
The shutoff in B, cast-in-situ concrete base plate crack
Due to cast-in-situ concrete base plate only crannied end face can be used as construction space, the solution that therefore prevents perfusion by a large amount of seepage flow in crack to the key that becomes shutoff in the foundation soil of base plate below;
(1) at the crack location of base plate, with electric drill, hole, aperture is greater than the diameter of the sebific duct of insertion, and the degree of depth enters at the bottom of plate 2-3cm in foundation soil, behind clear hole, inserts some sebific ducts, and the spacing along fracture length direction between some sebific ducts is 0.5m;
(2) on sebific duct top, connect a funnel, pour into the mixed liquor of bacterium liquid, nutrient salt solution and calcium source solution at funnel, three's volume ratio is 1:1:1, and mixed liquor relies on deadweight to flow in foundation soil, until the mixed liquor liquid level in funnel no longer drop to.Now, the tosca institute shutoff that the space in soil has been generated, transmission coefficient obviously reduces.
(3) extract after sebific duct, the end face in crack is sealed with adhesive tape.In the wide scope of the about 1cm in end face one end, crack, with gauze, seal.At crack other end end face, hole to the Slit bottom degree of depth, insert sebific duct, syringe is connected with sebific duct.
(4) with syringe, in crack, inject bacterium liquid, nutrient salt solution and calcium source solution respectively.Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze place has liquid to ooze out.
(5) slip casting work repeats once at interval of 24h, continues 5 days.
(6) remove the adhesive tape of gauze, sebific duct, syringe and sealing.
The present invention can effectively solve the endurance issues such as corrosion that in plate, Exposed reinforcement causes.Meanwhile, deposition product (calcium carbonate) is identical with ingredients of concrete, can as the organic materials such as epoxy resin, not have problem of aging; The coefficient of thermal expansion of material is also consistent, can not ftracture because of variations in temperature.In addition, bacterium liquid, nutrient salt solution and calcium source solution three good penetrability can be full of crack under pressure state, are particularly suitable for tiny and processing deep layer crack.
Accompanying drawing explanation
Fig. 1 is the generalized section of the Cracks of Cast-in-Situ Concrete Floor shutoff of embodiment 1;
Generalized section to foundation soil grouting when Fig. 2 is the concrete cast-in-situ base plate crack shutoff of embodiment 2;
The generalized section of fracture grouting when Fig. 3 is the concrete cast-in-situ base plate crack shutoff of embodiment 2;
Wherein 1, concrete cast-in-place slab free from flaw place, 2, crack, 3, adhesive tape, 4, gauze, 5, syringe, 6, sebific duct, 7, funnel, 8, foundation soil.
The specific embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1:
The method of microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab cracks on floor slab, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; The present invention selects calcium nitrate (Ca (NO
3)
2) solution or calcium acetate (Ca (CH
3cOO)
2) solution, concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, the present invention selects urea (CO (NH
2)
2) solution, concentration is 1mol/L;
(3) preparation of microorganism, the present invention adopts Pasteur bacillus, adopts fermentation tank culture.In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L.Wherein yeast extract (organic nitrogen source) and ammonium sulfate (inorganic nitrogen-sourced) is for bacterial growth provides nutrition, the adjustable solution acid alkalinity of NaOH (PH=9), and nickel chloride is as catalyzer and accelerate the growth of bacterium.With liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution.Incubation time is set as 20h, and Temperature Setting is 30 ℃, and for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; Cultivation finishes the rear enzymatic activity OD600 with conductivity method detection bacterium liquid and is greater than 1.
The shutoff of B, Pouring Concrete Floor Slab Crack, as shown in Figure 1,
Because end face and the bottom surface of concrete floorslab through crack 2 can provide construction space for shutoff, the periphery of concrete floorslab through crack 2 is concrete cast-in-place slab free from flaw place 1, for guaranteeing the density of shutoff, the present invention adopts the mode of crack base pressure perfusion to operate:
(1) for preventing that calcium source solution, nutrient salt solution and bacterium liquid that the cementation of fissures uses run off, end face and adhesive tape 3 sealings for bottom surface in the crack 2 of concrete floorslab.In gauze 4 sealings for the wide scope of the about 1cm in end face one end, crack, can guarantee that the aqueous solution flows out and bacterium is filtered in crack.In crack other end bottom, insert sebific duct 6, syringe 5 is connected with sebific duct 6.
(2) with syringe 5, in crack, inject bacterium liquid, nutrient salt solution and calcium source solution respectively.Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze place has liquid to ooze out.
(3) slip casting work repeats once at interval of 24h, continues 5 days.
(4) remove the adhesive tape 3 of gauze 4, sebific duct 6, syringe 5 and sealing.
Embodiment 2:
The method in microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab base plate crack, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; The present invention selects calcium nitrate (Ca (NO
3)
2) solution or calcium acetate (Ca (CH
3cOO)
2) solution, concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, the present invention selects urea (CO (NH
2)
2) solution, concentration is 1mol/L;
(3) preparation of microorganism, the present invention adopts Pasteur bacillus, adopts fermentation tank culture.In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L.Wherein yeast extract (organic nitrogen source) and ammonium sulfate (inorganic nitrogen-sourced) is for bacterial growth provides nutrition, the adjustable solution acid alkalinity of NaOH (PH=9), and nickel chloride is as catalyzer and accelerate the growth of bacterium.With liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution.Incubation time is set as 20h, and Temperature Setting is 30 ℃, and for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; Cultivation finishes the rear enzymatic activity OD600 with conductivity method detection bacterium liquid and is greater than 1.
The shutoff in B, cast-in-situ concrete base plate crack, as shown in Figure 2 and Figure 3,
Because cast-in-situ concrete base plate only has the end face in crack 2, can be used as construction space, the solution that therefore prevents perfusion by a large amount of seepage flow in crack to the key that becomes shutoff in the foundation soil 8 of base plate below;
(1) in 2 positions, crack of base plate, with electric drill, hole, aperture is greater than the glue of insertion, 6 diameter, and the degree of depth enters at the bottom of plate 2-3cm in foundation soil 8, behind clear hole, inserts some sebific ducts 6, and the spacing along fracture length direction between some sebific ducts 6 is 0.5m;
(2) on sebific duct 6 tops, connect a funnel 7, at funnel 7, pour into the mixed liquor of bacterium liquid, nutrient salt solution and calcium source solution, three's volume ratio is 1:1:1, and mixed liquor relies on deadweight to flow in foundation soil 8, until the mixed liquor liquid level in funnel 7 no longer drop to.Now, the tosca institute shutoff that the space in soil has been generated, transmission coefficient obviously reduces.
(3) extract after sebific duct 6, by adhesive tape 3 sealings for the end face in crack 2.In wide gauze 4 sealings for scope of the about 1cm in end face one end, crack.In crack, 2 other end end faces are holed to the Slit bottom degree of depth, insert sebific duct 6, and syringe 5 is connected with sebific duct 6.
(4) use syringe 52 interior injection bacterium liquid, nutrient salt solution and calcium source solution to crack respectively.Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack 3, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze 4 places have liquid to ooze out.
(5) slip casting work repeats once at interval of 24h, continues 5 days.
(6) remove the adhesive tape 3 of gauze 4, sebific duct 6, syringe 5 and sealing.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (2)
1. a method for microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab cracks on floor slab, is characterized in that, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; Adopt calcium nitrate solution or calcium acetate solution that concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, adopting concentration is 1mol/L urea liquid;
(3) preparation of microbial inoculum, adopts Pasteur bacillus, and uses fermentation tank culture; In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L, with liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution, incubation time is set as 20h, Temperature Setting is 30 ℃, for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; The enzymatic activity OD600 that cultivation finishes rear bacterium liquid is greater than 1;
The shutoff of B, Pouring Concrete Floor Slab Crack
Because end face and the bottom surface in cast-in-situ floor crack can both provide construction space for shutoff, be the density that guarantees shutoff, adopt the mode of crack base pressure perfusion to operate:
(1) for preventing that calcium source solution, nutrient salt solution and bacterium liquid that the cementation of fissures is used run off, and seal with adhesive tape in end face and the bottom surface of through crack; In the wide scope of end face one end, crack 1cm, with gauze, seal, can guarantee that the aqueous solution flows out and bacterium is filtered in crack; In crack other end bottom, insert sebific duct, syringe is connected with sebific duct;
(2) with syringe, in crack, inject bacterium liquid, nutrient salt solution and calcium source solution respectively; Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze place has liquid to ooze out;
(3) slip casting work repeats once at interval of 24h, continues 5 days;
(4) remove the adhesive tape of gauze, sebific duct, syringe and sealing.
2. the method in microbiological precipitation of CaCO 3 blocking concrete Bars In Poured Concrete Slab base plate crack, is characterized in that, comprising:
The preparation of A, plugging material
(1) preparation of calcium source solution, for tosca provides calcium ion; Adopt calcium nitrate solution or calcium acetate solution that concentration is 1mol/L;
(2) preparation of nutrient salt solution, for microbial growth and breeding provide nutriment, adopts the urea liquid that concentration is 1mol/L;
(3)) the preparation of microbial inoculum, adopts Pasteur bacillus, and uses fermentation tank culture; In fermentation tank, pack pure water into, every premium on currency adds following material and is mixed with culture medium solution: yeast extract 20g/L, ammonium sulfate 10g/L, NaOH 2g/L and nickel chloride 10umol/L, with liquid-transfering gun, Pasteur bacillus is seeded in culture medium solution, incubation time is set as 20h, Temperature Setting is 30 ℃, for guaranteeing to supply with the oxygen of bacterium abundance, vibration bed rotating speed is 210r/min; The enzymatic activity OD600 that cultivation finishes rear bacterium liquid is greater than 1;
The shutoff in B, cast-in-situ concrete base plate crack
Due to cast-in-situ concrete base plate only crannied end face can be used as construction space, the solution that therefore prevents perfusion by a large amount of seepage flow in crack to the key that becomes shutoff in the foundation soil of base plate below;
(1) at the crack location of base plate, with electric drill, hole, aperture is greater than the diameter of the sebific duct of insertion, and the degree of depth enters at the bottom of plate 2-3cm in foundation soil, behind clear hole, inserts some sebific ducts, and the spacing along fracture length direction between some sebific ducts is 0.5m;
(2) on sebific duct top, connect a funnel, pour into the mixed liquor of bacterium liquid, nutrient salt solution and calcium source solution at funnel, three's volume ratio is 1:1:1, and mixed liquor relies on deadweight to flow in foundation soil, until the mixed liquor liquid level in funnel no longer drop to; Now, the tosca institute shutoff that the space in soil has been generated;
(3) extract after sebific duct, the end face in crack is sealed with adhesive tape; In the wide scope of end face one end, crack 1cm, with gauze, seal; At crack other end end face, hole to the Slit bottom degree of depth, insert sebific duct, syringe is connected with sebific duct;
(4) with syringe, in crack, inject bacterium liquid, nutrient salt solution and calcium source solution respectively; Three's volume ratio is 1:1:1, before injection, should estimate the volume in crack, and the total amount of filling liquid should be greater than crevice volume, guarantees that gauze place has liquid to ooze out;
(5) slip casting work repeats once at interval of 24h, continues 5 days;
(6) remove the adhesive tape of gauze, sebific duct, syringe and sealing.
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