CN111559882B - Concrete crack repairing additive and preparation and use methods thereof - Google Patents
Concrete crack repairing additive and preparation and use methods thereof Download PDFInfo
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- CN111559882B CN111559882B CN202010513375.3A CN202010513375A CN111559882B CN 111559882 B CN111559882 B CN 111559882B CN 202010513375 A CN202010513375 A CN 202010513375A CN 111559882 B CN111559882 B CN 111559882B
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- 239000004570 mortar (masonry) Substances 0.000 claims description 59
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- 238000003756 stirring Methods 0.000 claims description 31
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Images
Classifications
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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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- 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
-
- 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
- C04B2111/22—Carbonation resistance
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Architecture (AREA)
- Inorganic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete crack repair additive, in particular to an organic silicon resin emulsion modified high-molecular polymer crack repair additive and a preparation and use method thereof. Every 100 parts by weight of the repair additive comprises 2-20 parts by weight of organic silicon resin emulsion, 2-6 parts by weight of film forming additive, 1-7 parts by weight of water reducing agent, 0.2-1 part by weight of defoaming agent and the balance of water; the solid content of the organic silicon resin emulsion is 45-55 percent; the film forming agent is at least one of propylene glycol butyl ether, ethylene glycol monopropyl ether and propylene glycol methyl ether acetate. By controlling the organic silicon resin emulsion, the water reducing agent and the defoaming agent within the range, the strength, the coalescence, the film forming property and the stability of the organic silicon resin emulsion are fully exerted, and the cement mortar prepared by the repairing additive has good strength and durability and is suitable for repairing the concrete fine cracks of 0.3-2.5 mm.
Description
Technical Field
The invention relates to a concrete crack repair additive, in particular to an organic silicon resin emulsion modified high-molecular polymer crack repair additive, and a preparation method and a use method thereof.
Background
The existence of cracks on the concrete surface is a serious disaster affecting the durability of the concrete structure. Under the combined action of a series of internal and external factors such as water loss, uneven soil texture of a structural foundation, hydration temperature rise and the like, plastic shrinkage cracks, settlement shrinkage cracks, temperature cracks and the like with different degrees can be generated in the concrete. Because the concrete structure is exposed to the natural environment all year round, the surface fine micro cracks have the trend of developing towards penetrating cracks and deep cracks under the action of temperature stress and external force. The through cracks and deep cracks can seriously affect the integrity of the concrete structure, change the overall stress condition of the concrete structure, cause the damage of the concrete structure and seriously affect the durability and the safety of the concrete structure.
The durability of the concrete building is improved, fine cracks of 0.3-2.5 mm on the surface of the concrete are repaired, the safety and the service life of the building are ensured, and the method is a problem which needs to be solved urgently in the current building industry.
One common mode for treating concrete cracks in the industry at present is to adopt cement mortar for plastering, and fill the cracks after the cement mortar is solidified and hardened. The other method is to fill epoxy resin emulsion into the crack, but the epoxy resin has low compressive strength and bending strength, larger brittleness and lower ductility, is used as a single material for repairing the concrete crack, has the hidden trouble of secondary cracking of the concrete, and has poor durability of the repaired concrete.
In conclusion, the concrete repaired by the existing repairing material for the concrete fine gaps has the problems of poor strength and poor durability.
Disclosure of Invention
The invention aims to: aiming at the problems of poor strength and poor durability of the existing concrete repair material, the organic silicon resin emulsion modified high molecular polymer crack repair additive is provided, and has good fluidity and cohesiveness; the additive is mixed with cement, filler and sand for use, can effectively permeate into concrete fine cracks, and improves the strength performance and durability of structural concrete.
In order to achieve the purpose, the invention adopts the technical scheme that:
the concrete crack repairing additive comprises, by weight, 2-20 parts of organic silicon resin emulsion, 2-6 parts of film forming additive, 1-7 parts of water reducing agent, 0.2-1 part of defoaming agent and the balance of water per 100 parts of the additive; the solid content of the organic silicon resin emulsion is 45-55 percent; the film forming agent is at least one of propylene glycol butyl ether, ethylene glycol monopropyl ether and propylene glycol methyl ether acetate.
The crack repair additive is mixed with common cement mortar in proportion, and the mixture is fully stirred to form crack repair mortar which is suitable for repairing fine cracks of concrete.
The organic silicon resin emulsion has the advantages of high temperature resistance, electric insulation, radiation resistance, flame retardance, water resistance, corrosion resistance and the like, and a hard film can be formed on the surface of concrete after curing, so that the surface strength of the concrete is improved. The film forming additive is also called as a coalescing additive or a film forming agent, has higher flexibility, improves the stability of the organic silicon resin, can promote the plastic flow and elastic deformation of latex particles, improves the coalescing performance, promotes the high-molecular film forming, and improves the compactness of the film forming surface, thereby improving the impermeability of the repaired concrete.
The water reducing agent has strong stability, can be adsorbed on the surface of cement particles, and improves the dispersibility of a cement-water system through the action of electrostatic repulsion; meanwhile, the cement-water system is subjected to space blocking, so that extremely high water reducing rate is achieved, the cohesiveness of the mortar is increased, and the uniformity of the mortar is improved. The defoaming agent can reduce the surface tension of the foam locally. Meanwhile, the stability of the emulsion is improved, and the dispersibility of the added materials is improved.
The solid content of the organic silicon resin emulsion is 45-55%, which means that the weight percentage of the organic silicon resin in the emulsion is 45-55%. When the solid content of the organic silicon resin emulsion is in the range, the organic silicon resin emulsion has stable property and is easy to be mixed with other components. After the reaction of the organic resin emulsion is finished, water is separated from the system, the effective component of the organic resin emulsion is organic silicon resin, 2-20 parts of the organic resin emulsion with the solid content of 45% -55%, and the technicians in the field can reversely deduce the weight parts of the actually used emulsion according to the solid content of the actually used emulsion. The final component contains 0.9-11 weight parts of organic resin. In practice, it is necessary to use it in the form of a silicone resin emulsion, and the specific parts by weight and solids content can be adjusted as appropriate by those skilled in the art.
The composition with the combination and the weight portion proportion range enables the organic silicon resin emulsion to show excellent fluidity and film forming performance under the combined action of the water reducing agent, the defoaming agent and the film forming additive, and the additive can effectively permeate into concrete fine cracks and improve the compactness and the durability of structural concrete by mixing the additive with cement, filler and sand.
In a preferred embodiment of the present invention, the silicone resin emulsion is one or more of a silane-containing organic resin emulsion, a siloxane-containing organic resin emulsion, and a silicate-containing organic resin emulsion.
In a preferable embodiment of the present invention, the silicone resin emulsion is contained in an amount of 9 to 15 parts by weight based on 100 parts by weight of the additive.
With the increase of the content of the organic silicon resin emulsion, the surface strength and the impermeability of the repaired concrete are enhanced, but when the organic silicon resin is more than 15 parts, in the using process, because the viscosity of the organic silicon resin emulsion is increased, bubbles are increased in the stirring and mixing process, and the additives such as a defoaming agent and the like cannot be completely eliminated, so that the surface strength of the concrete is reduced. When the content of the organic silicon resin emulsion is within 9-15 parts by weight, the performance of the repaired concrete is better.
In a preferred embodiment of the present invention, when the viscosity of the silicone resin emulsion is 10 to 30mPa · s, the viscosity of the silicone resin emulsion is in the range of 10 to 30mPa · s, the fluidity of the mortar is improved, the mortar is favorably penetrated into the fine cracks, the shrinkage performance after film formation is improved, and the mortar is less likely to be broken.
In a preferable embodiment of the present invention, the content of the film forming agent is 2 to 4 parts by weight in 100 parts by weight of the additive.
In a preferred embodiment of the present invention, the water reducing agent is one or more of a polyhydroxy acid water reducing agent, a naphthalene water reducing agent, and a melamine water reducing agent. The three water reducing agents are high-efficiency water reducing agents, the water reducing rate can reach more than 20%, the water reducing agents have a strong dispersing effect on cement, the flowing property of cement mixtures can be greatly improved, the water consumption is greatly reduced, and the working performance of concrete is remarkably improved.
As a preferable scheme of the invention, the defoaming agent is one or more of polyoxyethylene ether and polyether modified polysiloxane defoaming agent. The defoaming agent has excellent performances of high temperature resistance, strong acid and strong alkali resistance, and is beneficial to improving the durability of thick concrete repair.
The concrete crack repair mortar comprises the concrete crack repair additive and powder; the weight ratio of the concrete crack repair additive to the powder is 1:4-1: 7; the powder comprises the following raw materials, by weight, 100-300 parts of cement, 30-100 parts of admixture and 100-250 parts of sand. Preferably, the weight ratio of the additive to the powder is 1:5 to 1:6, more preferably 1: 5.5.
The powder materials and the additives are mixed for use, and the addition of the admixture and the sand is beneficial to improving the dispersibility of the cement, playing a role of a microfiller, reducing the drying shrinkage of the mortar and improving the toughness of the mortar. When the proportion of the additive and the powder is controlled to be the above proportion, a plurality of tiny mechanical occlusions and inlays are formed after the repair mortar is cured to form a certain bonding strength, so that the repair mortar and the concrete have stronger bonding capability. The prepared mortar-repaired concrete has good bonding strength and good durability such as carbonization resistance, chloride ion corrosion resistance, freezing resistance and the like. In the repair slurry, the additive is used in an unchanged amount, and the surface strength of the repaired concrete is reduced and the impermeability is increased along with the increase of the powder proportion. When the ratio of the additive to the powder is 1:4-1:7, the comprehensive performance of strength and durability is better.
In a preferable embodiment of the present invention, the content of the cement in the powder is 30 to 40% by weight. Namely, the cement content is 30 to 40 parts by weight per 100 parts by weight of the powder.
The cement is beneficial to improving the anti-permeability performance, and the admixture and the sand can improve the toughness of the slurry, so that the strength performance is improved; when the proportion of the cement is too high, although the impermeability is increased, the crack due to drying shrinkage is easy to occur, and the strength performance is reduced.
As a preferable scheme of the invention, the admixture is at least one of fly ash, granulated blast furnace slag powder and silica fume.
In a preferable embodiment of the present invention, the strength of the cement is 42.5MPa or more, and the specific surface area of the cement is 370m or more2/kg；
The specific surface area of the admixture is more than or equal to 400m2Per kg; the sand is natural second-zone medium sand, and the fineness modulus is less than or equal to 2.3.
The admixture can improve the compactness and the strength of the mortar, the sand can improve the viscosity property, the compactness and the strength of the mortar, and the anti-abrasion performance is improved in the early stage.
The preparation method of the concrete repair mortar is characterized by comprising the following steps of weighing raw materials according to the proportion of the additive to the powder, placing the raw materials in a container, stirring for 2-10 minutes under the condition of 600r/min, standing, and stirring for 3-15 minutes under the condition of 3000r/min 1500-.
Firstly, stirring at a low speed to ensure that all components can be dispersed more spatially, and avoiding the agglomeration of powder to form agglomerated particles; and standing for half a minute, after large air bubbles are diffused, further mixing the additive and the powder through high-speed stirring, fully mixing the additive and the powder, fully contacting the components during high-speed stirring, performing pre-reaction, and better exerting the mortar performance.
The use method of the concrete repair mortar comprises the step of pumping the mortar into cracks in a grouting mode, wherein the pumping pressure is more than or equal to 2Mpa during grouting.
By adopting a grouting mode, the mortar can penetrate into the depth of a concrete fine crack of 0.3-2.5 mm, the crack is completely repaired, the condition that the mortar cannot completely penetrate and is not uniform is avoided, and the repairing effect of the mortar is fully exerted.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the concrete crack repairing additive disclosed by the invention fully exerts the strength, the coalescence, the film forming speed and the stability of the organic silicon resin emulsion by using the organic silicon resin emulsion, the water reducing agent and the defoaming agent and controlling the organic silicon resin emulsion, and the concrete repaired by using the repairing additive has good strength, cohesiveness, contractibility and permeability. The mortar can effectively permeate into the concrete fine cracks of 0.3-2.5 mm, and the strength performance and durability of the structural concrete are improved.
2. According to the concrete crack repair mortar disclosed by the invention, appropriate cement, admixture and sand are selected and reasonably mixed with the repair additive, so that the obtained mortar is excellent in comprehensive performance and excellent in strength and durability. Wherein the bonding strength can reach 9.5MPa, and the strength guarantee rate after repair reaches 81 percent; the material has good compressive strength and flexural strength; the chloride ion permeability 662C and 28d is resistant to carbonization depth of 4.2mm, the freeze-thaw resistance rate is 0.08%, the corrosion resistance coefficient is 106%, and the durability is good.
3. The application method of the concrete repair mortar disclosed by the invention is characterized in that the concrete repair mortar is injected into the crack in a grouting mode with the pump pressure being more than or equal to 2Mpa, so that the repair mortar obtained by the invention can reach the deep part of the crack, and the effect of a repair additive or the repair mortar is better exerted.
Drawings
FIG. 1 is a schematic view showing the state of the concrete crack repair additive of the present invention.
FIG. 2 is a schematic view showing the state of the powder component of the mortar for repairing concrete cracks of the present invention.
FIG. 3 is a schematic view showing the effect of the mortar for repairing concrete cracks.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The mortar in each example was subjected to performance testing by the following method.
Bond strength test method: breaking the general basic mortar according to the Polymer modified Cement mortar test Specification (DL/T5126-2001), bonding by using high molecular polymer mortar, curing the bonded test piece in a standard curing room with the temperature of 20 +/-3 ℃ and the relative humidity of more than 95%, and measuring the secondary breaking strength of the general basic mortar in different ages. Preparing a prism-shaped mortar test piece with the mixing ratio of 40mm multiplied by 160mm from the basic mortar, carrying out die maintenance in a standard maintenance room, breaking the test piece after 28 days, washing the section clean by a high-pressure water gun after breaking, wiping floating ash by alcohol, preparing mortar according to the mixing ratio after drying, coating the mortar to the section with the coating thickness of 1mm, bonding the mortar test piece, placing the bonded mortar test piece into the standard maintenance room for maintenance, and measuring the bending strength of the mortar for 3, 7 and 28 days. The flexural strength measured is the bond strength
The secondary compression strength test method comprises the following steps: manufacturing a cube standard test piece of 100mm multiplied by 100mm, curing for 28 days in a standard curing chamber with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95%, then carrying out compression treatment on the concrete by using special pressure detection equipment for the concrete, respectively carrying out stress load for 0.5s, 1s and 1.5s when the stress-strain curve of the concrete reaches a peak value, selecting the concrete with the crack of 0.3-2.5 mm as a test group, pouring crack repairing mortar into the crack, curing in the standard curing chamber, and measuring the cube compressive strength of the concrete in different repairing ages.
Resistance to chloride ion penetration: according to the requirement of a concrete chloride ion penetration resistance test, after curing for 28 days in a standard curing room with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95%, a concrete test block with the size of 100mm multiplied by 50mm is prepared, then a high polymer surface reinforcing agent is coated, after curing for 7, 14 and 28 days, vacuum water saturation is carried out on the concrete test block, the high polymer surface reinforcing agent is coated on the surface of the concrete, the concrete test block is subjected to vacuum water saturation, after water saturation, the test block is taken out and installed in a test groove, the sealing performance of the test block is checked, a sodium chloride solution with the concentration of 3% and a sodium hydroxide solution with the concentration of 0.3mol/L are injected into the test groove, the current value is recorded every 30 minutes, and the test is finished after 6 hours.
And (3) carbonization test: in the standard of test methods for long-term performance and durability of ordinary concrete (GB/T50082-2009), concrete test blocks coated with a high-molecular polymer surface reinforcing agent are placed into a carbonization box, the distance between the test blocks is 50mm, the concentration is kept at 20 +/-3%, the relative humidity is controlled at 70%, and the temperature is controlled at 20 +/-2 ℃. And taking out the test blocks according to different ages, splitting the test blocks, dripping 1% phenolphthalein alcohol solution, and measuring the carbonization depth of each measurement area by using a vernier caliper after 30 s.
And (3) freezing resistance test: and (3) soaking the concrete test block coated with the high molecular polymer surface reinforcing agent for 28 days in water, and taking out the test block after 4 days to measure the initial mass and the initial value of the transverse fundamental frequency of the test block. And (3) putting the test block into a freeze-thaw box for freeze-thaw cycle test, and measuring the quality and the transverse fundamental frequency of the test block after each 50 times of freeze-thaw cycles. And measuring the mass loss rate and the relative dynamic elastic modulus according to a formula.
Sulfate corrosion resistance: and respectively soaking the concrete test blocks coated with the high molecular polymer surface reinforcing agent for 28 days in plastic containers filled with 5% sodium sulfate solution and clear water for 28, 60, 90 and 150 days. The pH value and the temperature of the sodium sulfate solution are periodically checked, so that the pH value is kept between 6 and 8, and the temperature is kept at 25 +/-2 ℃. And (3) periodically detecting the compressive strength of the concrete soaked in different solutions, and calculating the corrosion resistance coefficient according to a formula.
Wherein K represents corrosion resistance (%);
R1-compressive strength (MPa) of concrete soaked in clear water;
R2compressive strength (MPa) of concrete soaked in solution.
The compressive strength and the flexural strength of the repaired concrete are represented by the bonding strength and the strength guarantee rate.
In the test results, the higher the bonding strength (unit is MPa), the better the bonding performance of the repair mortar and the concrete, and the stronger the capability of bonding the repair mortar and the concrete into a whole because a plurality of tiny mechanical occlusions and inlays are formed after the repair mortar is cured.
The strength guarantee rate is the percentage of the ratio of the compressive strength of the standard concrete sample to the compressive strength of the repaired concrete sample, and the higher the value is, the stronger the repairing capability of the concrete is.
The strength assurance rate after repair is calculated according to the following formula:
gamma-in the formula-the post-repair strength assurance (%);
f0-standard concrete test piece compressive strength (MPa);
fbcompressive Strength (MPa) of concrete specimen after mortar repair
The durability of the repaired concrete is characterized by chloride ion permeability resistance, 28d carbonization depth (mm) resistance, freezing resistance test (300 times of freeze-thaw cycle mass loss rate) and sulfate corrosion resistance (corrosion resistance coefficient).
The chlorine ion permeation resistance is evaluated by an electric flux method, and the smaller the current value C is, the stronger the chlorine ion permeation resistance is; the smaller the 28d carbonization resistance depth value is, the stronger the carbonization resistance is; the frost resistance test (300 times of freeze-thaw cycle mass loss rate) means that the mass loss rate of the concrete without the surface reinforcing agent and the mass loss rate of the concrete coated with the surface reinforcing agent are both within 5 percent, the standard requirement is met, and the lower the value, the better the frost resistance; the resistance to sulfate attack (corrosion resistance coefficient) is less than 100, which indicates that the concrete test block soaked in the sulfate solution starts to be damaged and the strength is reduced, and the higher the value, the stronger the resistance to sulfate attack.
Example 1
The raw materials were weighed out in the weight ratios of the components in table 1. Putting the raw materials into a stirrer, firstly stirring at low speed, preliminarily mixing the components, stirring at 500 revolutions per minute for 3 min; standing for 40s, and stirring at high speed of 2500 rpm for 5 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the silicone resin emulsion is 6683 silicone resin emulsion (mainly containing organosilane and silicate); the water reducing agent is a polyhydroxy acid water reducing agent; the defoaming agent is polyether defoaming agent; the film forming agent is propylene glycol butyl ether. The cement is 42.5 type ordinary portland cement; the admixture is fly ash; the sand is medium sand with fineness modulus of 2.2.
Example 2
The raw materials were weighed out in the weight ratios of the components in table 1. The preparation method is the same as example 1. Putting the raw materials into a stirrer, firstly stirring at a low speed, preliminarily mixing the components, wherein the stirring speed is 400 revolutions per minute, and the stirring time is 3 min; standing for 30s, and stirring at high speed of 2000 rpm for 4 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the organic silicon resin emulsion is SH9608 organic silicon resin emulsion (the main component is organic siloxane) of New Sihai company; the water reducing agent is a polyhydroxy acid water reducing agent; the defoaming agent is polyether defoaming agent; the film-forming agent is ethylene glycol monopropyl ether. The cement is 42.5 type portland cement; the admixture is granulated blast furnace slag powder; the sand is medium sand with fineness modulus of 2.2.
Example 3
The raw materials were weighed out in the weight ratios of the components in table 1. The preparation method is the same as example 1. Putting the raw materials into a stirrer, firstly stirring at low speed, preliminarily mixing the components, wherein the stirring speed is 600 revolutions per minute, and the stirring time is 2 min; standing for 20s, and stirring at high speed of 1500 rpm for 5 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the silicone resin emulsion is 6683 silicone resin emulsion of Dow Corning company; the water reducing agent is a naphthalene water reducing agent; the defoaming agent is polyether defoaming agent; the film forming agent is propylene glycol methyl ether acetate. The cement is ordinary portland cement; the admixture is silica fume; the sand is medium sand with fineness modulus of 2.1.
Example 4
The raw materials were weighed out in the weight ratios of the components in table 1. The preparation method is the same as example 1. Putting the raw materials into a stirrer, firstly stirring at a low speed, preliminarily mixing the components, wherein the stirring speed is 400 revolutions per minute, and the stirring time is 2 min; standing for 20s, and stirring at high speed of 2000 rpm for 4 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the silicone resin emulsion is 6683 silicone resin emulsion of Dow Corning company; the water reducing agent is a naphthalene water reducing agent; the defoaming agent is modified polysiloxane; the film forming agent is propylene glycol butyl ether. The cement is ordinary portland cement; the admixture is fly ash; the sand is medium sand with fineness modulus of 2.2.
Example 5
The raw materials were weighed out in the weight ratios of the components in table 1. The preparation method is the same as example 1. Putting the raw materials into a stirrer, firstly stirring at a low speed, preliminarily mixing the components, wherein the stirring speed is 400 revolutions per minute, and the stirring time is 2 min; standing for 60s, and stirring at high speed of 3000r/min for 4 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the organic silicon resin emulsion is SH9608 organic silicon resin emulsion of New Sihai company; the water reducing agent is melamine water reducing agent; the defoaming agent is modified polysiloxane; the film forming agent is propylene glycol methyl ether acetate. The cement is ordinary portland cement; the admixture is fly ash; the sand is medium sand with fineness modulus of 2.0.
Example 6
The raw materials were weighed out in the weight ratios of the components in table 1. The preparation method is the same as example 1. Putting the raw materials into a stirrer, firstly stirring at low speed, preliminarily mixing the components, stirring at 500 revolutions per minute for 3 min; standing for 40s, and stirring at high speed of 2000 rpm for 5 min. Obtaining the repair mortar material. The test results are shown in Table 1.
Wherein the silicone resin emulsion is a resin emulsion prepared by mixing a Dow Corning 6683 silicone resin emulsion and a New Sihai SH9608 silicone resin emulsion according to a ratio of 1: 1; the water reducing agent is melamine water reducing agent; the defoaming agent is modified polysiloxane; the film forming agent is propylene glycol methyl ether acetate. The cement adopts XX type sulphoaluminate cement; the admixture is silica fume; the sand is medium sand with fineness modulus of 2.2.
TABLE 1, EXAMPLES 1-6 Components content and Performance test results
From the test results in table 1, it can be seen that after the cement mortar is prepared by using the raw materials and the additive in the weight ratio, the concrete repaired by using the mortar of the present invention has excellent compressive strength and flexural strength as can be seen from the test results of the bond strength and the strength assurance rate. According to the test results of the chloride ion permeability resistance, the 28d carbonization depth resistance, the freeze-thaw resistance and the corrosion resistance coefficient, the concrete repaired by the mortar has good durability.
Comparative example 1
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
This comparative example differs from example 1 in that the silicone resin solution was 25 parts by weight.
Comparative example 2
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
This comparative example differs from example 1 in that the silicone resin solution was 30 parts by weight.
As is apparent from the test results of comparative example 1 and comparative example 2 in Table 2, when the proportion of the silicone resin emulsion is out of the range to be protected in the present application, the bond strength and the strength securing rate after repair are both reduced as compared with the result of example 1, and the compressive strength and the flexural strength of the concrete are both reduced as the amount of the silicone resin emulsion is increased. The strength requirement of concrete cannot be met.
Comparative example 3
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
The comparative example is different from example 1 in that the cement is 350 parts by weight.
Comparative example 4
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
The difference between the comparative example and the example 1 is that the admixture fly ash is 20 parts by weight.
Comparative example 5
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
The comparative example is different from example 1 in that the sand is 80 parts by weight.
As can be seen from the comparison between the test results of comparative examples 3 to 5 in Table 3 and the test results of example 1, when the amount of cement is out of the range as defined in the present application, or the amount of admixture used is less than the range as defined in the present application, or the amount of sand is less than the range as defined in the present application, the repaired crack is liable to undergo shrinkage cracking, deterioration in the chloride ion resistance, deterioration in the carbonization resistance, and deterioration in the freeze-thaw cycle resistance. The corrosion resistance coefficient is reduced. When the proportion of the powder is beyond the protection range of the application, the durability of the repaired concrete is reduced.
Comparative example 6
The raw materials were weighed out in the weight ratios of the components in table 2. The preparation method is the same as example 1. The test results are shown in Table 2.
This comparative example is different from example 1 in that the preparation was carried out by stirring at a high speed for 8 minutes without stirring at a low speed for 2500 rpm.
As can be seen from the comparison between the test results of comparative example 6 in Table 2 and example 1 in Table 1, the test results were reduced in both strength and durability when the components were directly stirred uniformly by the rapid stirring method. This is because direct rapid stirring leads to partial agglomeration of the powders and the formation of a large number of bubbles, the agglomeration and bubbles of these powders reducing the properties of the mortar.
Table 2, comparative examples 1 to 6 each component content and performance test results
Test example 1
The proportion of the components and the method in example 1 are adopted, the proportion of the silicone resin emulsion to the water is changed, and the proportion of other raw materials is the same as that in example 1. And when testing the content of the organic silicon resin emulsion, the performance of the repaired concrete.
Table 3, effect of silicone resin emulsion content on performance.
From the test results in table 3, it can be seen that when the silicone resin is added, as the content of the silicone resin emulsion increases, the adhesive strength and the strength assurance rate after repair tend to increase first and then decrease, and when the content is within a range of 9 to 15 parts by weight, the adhesive strength and the strength assurance rate after repair are superior. This is because, when the silicone resin is used in an amount of more than 15 parts, the viscosity of the silicone resin emulsion increases during use, and bubbles increase during mixing, and the surface strength of the concrete is reduced because the bubbles cannot be completely eliminated by using an auxiliary such as an antifoaming agent.
Test example 2
The proportion and the method of the components in example 1 are adopted, the type and the proportion of the film forming agent and the proportion of water are changed, and the proportion of other raw materials is the same as that in example 1. And testing the performance of the repaired concrete when different film-forming agent contents are tested.
TABLE 4 Effect of film Forming agent content on Properties
The test results in table 4 show that the bonding strength and the strength guarantee rate after repair are basically unchanged after the film forming agent is added, and the film forming agent also shows a basically unchanged trend along with the increase of the film forming agent, because the film forming agent improves the emulsion film forming, and the film forming agent volatilizes after the film forming, so that the strength performance of the resin cannot be influenced. However, when the film forming agent exceeds 6 parts, the permeation resistance to chloride ions is lowered. The influence of the film forming speed and the permeability is comprehensively considered, and when the weight of the film forming agent is 2-4 parts, the comprehensive performance is better.
Test example 3
The repair additive and the powder are prepared respectively by the component proportion and the method in the example 1. The proportions of the repair additive and powder were adjusted and the other components and amounts were the same as in example 1. And testing the performance of the repaired concrete under different proportions.
TABLE 5 Effect of additive to powder ratio on Properties
| Experiment number | 3-1(g) | 3-2(g) | 3-3(g) | 3-4(g) | 3-5(g) | 3-6(g) |
| Weight ratio of additive to powder | 1:4 | 1:5 | 1:6 | 1:7 | 1:8 | 1:9 |
| Adhesive strength (Mpa) | 9.4 | 9.4 | 9.2 | 8.4 | 7.4 | 7.3 |
| Post repair strength assurance (%) | 83 | 84 | 82 | 78 | 75 | 72 |
| Resistance to chloride ion permeation (C) | 681 | 673 | 668 | 668 | 664 | 661 |
| 28d carbonization depth (mm) | 4.1 | 4.2 | 4.2 | 4.2 | 4.3 | 4.1 |
| Resistance to Freeze-thaw (%) | 0.08 | 0.09 | 0.07 | 0.08 | 0.11 | 0.07 |
| Corrosion resistance coefficient (%) | 103 | 105 | 104 | 103 | 102 | 103 |
From the test results in table 5, it can be seen that in the repair slurry, the additive amount is unchanged, and as the powder ratio is increased, the surface strength of the repaired concrete is reduced and the impermeability is increased. When the ratio of the additive to the powder is 1:4-1:7, the prepared slurry has appropriate concentration, the grouting operation is easy, and the repairing effect of the slurry is more easily exerted. The repaired concrete has better comprehensive performance of strength and durability.
Test example 4
On the basis of example 1, the total weight of the powder was kept constant, i.e., 420g, and the proportions of cement, admixture and sand were adjusted. When powder with different cement contents is tested, the performance of the repaired concrete is tested.
TABLE 6 Effect of cement proportion in powder on Performance
| Experiment number | 4-1(g) | 4-2(g) | 4-3(g) | 4-3(g) | 4-5(g) | 4-6(g) |
| Cement | 75 | 100 | 125 | 150 | 175 | 200 |
| Blending material | 55 | 55 | 55 | 55 | 55 | 55 |
| Sand | 290 | 265 | 240 | 215 | 190 | 165 |
| Adhesive strength (Mpa) | 9.4 | 9.2 | 9.3 | 8.7 | 7.4 | 7.2 |
| Post repair strength assurance (%) | 82 | 83 | 82 | 77 | 74 | 72 |
| Resistance to chloride ion permeation (C) | 721 | 712 | 670 | 663 | 658 | 655 |
| 28d carbonization depth (mm) | 4.1 | 4.2 | 4.2 | 4.3 | 4.1 | 4.2 |
| Resistance to Freeze-thaw (%) | 0.08 | 0.09 | 0.10 | 0.07 | 0.09 | 0.08 |
| Corrosion resistance coefficient (%) | 105 | 104 | 103 | 103 | 102 | 104 |
From the test results of Table 6, it is understood that when the proportion of cement in the powder increases, the cohesive strength and the strength securing rate after restoration tend to decrease, mainly because when the proportion of cement increases, dry shrinkage cracking tends to occur, so that the strength properties decrease. As the proportion of cement increases, the resistance to chloride ion penetration increases. The comprehensive consideration of the concentration and the impermeability of the blended slurry is that when the proportion of the cement is 30-40%, the comprehensive performance is better.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The concrete crack repairing additive is characterized in that every 100 parts by weight of the additive comprises 9-15 parts by weight of organic silicon resin emulsion, 2-4 parts by weight of film forming additive, 1-7 parts by weight of water reducing agent, 0.2-1 part by weight of defoaming agent and the balance of water; the solid content of the organic silicon resin emulsion is 45-55 percent; the film-forming assistant is at least one of propylene glycol butyl ether, ethylene glycol monopropyl ether and propylene glycol methyl ether acetate.
2. The concrete crack repair additive of claim 1, wherein the silicone resin emulsion is at least one of a silane-containing resin emulsion, a siloxane-containing resin emulsion, and a silicate-containing resin emulsion.
3. The concrete crack repairing additive of claim 1, wherein the silicone resin emulsion has a viscosity of 10 to 30 mPa-s.
4. A concrete crack-repairing mortar comprising the concrete crack-repairing additive according to any one of claims 1 to 3, and a powder material; the weight ratio of the concrete crack repair additive to the powder is 1:4-1: 7; the powder comprises the following raw materials, by weight, 100-300 parts of cement, 30-100 parts of admixture and 100-250 parts of sand.
5. The mortar for repairing concrete cracks according to claim 4, wherein the weight content of the cement in the powder material is 30-40%.
6. The concrete crack repair mortar of claim 4, wherein the admixture is at least one of fly ash, granulated blast furnace slag powder and silica fume.
7. The mortar for repairing concrete cracks according to claim 4, wherein the strength of the cement is 42.5MPa or more, and the specific surface area of the cement is 370m or more2Per kg; the specific surface area of the admixture is more than or equal to 400m2Per kg; the sand is natural second-zone medium sand, and the fineness modulus is less than or equal to 2.3.
8. The preparation method of the mortar for repairing concrete cracks as claimed in any one of claims 4 to 7, which is characterized by comprising the following steps of weighing raw materials according to the proportion of the additive for repairing concrete cracks and the powder material as claimed in any one of claims 1 to 3, placing the raw materials in a container, stirring for 2-10 minutes under the conditions of 600r/min and 400-.
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