CN111285646A - Epoxy resin modified crack repair mortar and preparation and use methods thereof - Google Patents
Epoxy resin modified crack repair mortar and preparation and use methods thereof Download PDFInfo
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- CN111285646A CN111285646A CN202010079893.9A CN202010079893A CN111285646A CN 111285646 A CN111285646 A CN 111285646A CN 202010079893 A CN202010079893 A CN 202010079893A CN 111285646 A CN111285646 A CN 111285646A
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- epoxy resin
- resin modified
- crack repair
- repair mortar
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 65
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 65
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 57
- 230000008439 repair process Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000004567 concrete Substances 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000000839 emulsion Substances 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims description 15
- 239000002893 slag Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 239000011398 Portland cement Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 8
- 238000009775 high-speed stirring Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 238000003763 carbonization Methods 0.000 abstract description 4
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 13
- 239000004568 cement Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 230000036571 hydration Effects 0.000 description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 125000001033 ether group Chemical group 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000010220 ion permeability Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- 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
- C04B2111/26—Corrosion of reinforcement 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
- 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
- C04B2111/29—Frost-thaw 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
Abstract
The invention belongs to the technical field of building materials, and particularly relates to epoxy resin modified crack repair mortar and a preparation and use method thereof. The epoxy resin modified crack repair mortar comprises a polycarboxylic acid high-efficiency water reducing agent: 0.2-1%, standard sand: 34-73.8%, 1-5% of epoxy resin emulsion, and the balance of a cementing material: 25 to 60 percent. The epoxy resin modified crack repairing mortar can effectively repair 0.3-2.5mm cracks on the surface of concrete caused by various reasons, has higher compressive strength, caking property and crack resistance, can effectively repair the cracks on the surface of the concrete, improves the impermeability, the carbonization resistance and the corrosion resistance of harmful chemical substances of the repaired concrete, improves the surface density of the concrete, enhances the durability of a concrete structure, and prolongs the service life of the concrete. The invention is suitable for repairing the surface of industrial and civil cracked concrete buildings.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to epoxy resin modified crack repair mortar applied to repairing the surfaces of industrial and civil cracked concrete buildings, and a preparation method and a use method thereof.
Background
One of the diseases of concrete structures that are common today is the problem of cracking of concrete. Because of uneven settlement of the foundation, overhigh hydration temperature rise caused by too fine cement or too much cement consumption, poor maintenance conditions in the concrete construction process, too fast surface moisture evaporation before concrete condensation, insufficient reinforcement rate of the concrete and the like, the concrete has inevitable cracks. The concrete structure is exposed in an outdoor environment throughout the year in the use process, harmful substances such as acid, alkali, salt and the like enter the concrete structure along with rainwater and condensed water and enter the concrete structure through cracks to generate chemical corrosion, so that the alkalinity of set cement is reduced, the protection capability of reinforcing steel bars is reduced, and meanwhile, chloride ions are easy to contact the surfaces of the reinforcing steel bars through the cracks to cause corrosion. Further loss of calcium hydroxide under rain wash results in reduced strength and poor volume stability. The water-containing gaps are further enlarged upon exposure to freeze-thaw cycles, seriously affecting the durability of the concrete structure.
With the rapid development of the urbanization process in China, concrete has become one of the largest building materials in domestic consumption at present, and the problem that the building industry must solve is to ensure the safety of concrete material buildings. At present, comprehensive research on repairing of 0.3-2.5mm cracks of concrete by adopting high-molecular polymer crack repairing mortar in the market is relatively less, and one mode for generally treating the concrete cracks is to plaster the concrete cracks by using common mortar, only fill the cracks on the surface of a concrete structure, have poor bonding capability, and easily perform secondary cracking without repairing fine cracks in the depths of the cracks; another way is to pour epoxy into the crack, but this is simpler and does not prevent the concrete crack from further developing. Therefore, the modified crack repairing mortar which is modified by the epoxy resin and has the advantages of good working performance, good fluidity, good water retention, high bonding strength with crack walls, strong permeability, excellent compactness after hardening, strong carbonization resistance, chloride ion resistance, strong freeze-thaw cycle resistance and good durability is developed at present.
Disclosure of Invention
The invention discloses epoxy resin modified crack repair mortar and a preparation method and a use method thereof, which aim to solve any one of the above and other potential problems in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows: the epoxy resin modified crack repair mortar comprises the following components in percentage by weight:
polycarboxylic acid high-efficiency water reducing agent: 0.2-1%, standard sand: 34-73.8%, 1-5% of epoxy resin emulsion, and a cementing material: 25 to 60 percent.
Further, the epoxy resin modified crack repair mortar comprises the following components in percentage by weight:
polycarboxylic acid high-efficiency water reducing agent: 0.33-0.82%, standard sand: 44-63.77%, epoxy resin emulsion 2.2-4.5%, and a cementing material: 33.7 to 51.4 percent.
Further, the cementing material is ordinary portland cement, II-grade slag powder and water; the mass percent of the ordinary Portland cement is 20-40%, the mass percent of the II-grade slag powder is 5-20%, and the balance is water.
Further, the epoxy resin modified crack repair mortar comprises the following components in percentage by weight: 0.69 percent of polycarboxylic acid high-efficiency water reducing agent, 58.51 percent of standard sand, 2.3 percent of epoxy resin emulsion, 38.5 percent of cementing material, 25 percent of ordinary portland cement in the cementing material, 10.5 percent of II-grade slag powder and the balance of water.
Further, the epoxy resin modified crack repair mortar comprises the following components in percentage by weight: 0.84% of polycarboxylic acid high-efficiency water reducing agent, 50.46% of standard sand, 2.8% of epoxy resin emulsion, 45.9% of cementing material, 33.5% of ordinary portland cement in the cementing material, 8.4% of II-grade slag powder and the balance of water.
The invention also aims to provide a method for preparing the epoxy resin modified crack repair mortar, which specifically comprises the following steps:
s1) weighing each component according to the design components for later use;
s2) mixing the epoxy resin emulsion with water uniformly, mixing by adopting a physical machine, and adding other components;
s3), stirring at a low speed, standing, and then stirring at a high speed to obtain the epoxy resin modified crack repair mortar.
Furthermore, the net slurry fluidity of the epoxy resin modified crack repair mortar can reach 190mm, the compressive strength after 28 days of hardening is not lower than 61.7MPa, the breaking strength is not lower than 11.4MPa, the compression-shear bonding strength is not lower than 7.4MPa, and the mass loss rate after 300 times of freeze-thaw cycles is not higher than 0.31%.
Further, the rotation speed of the low-speed stirring in the step S3) is 150r/min of rotation 130 and 55-70r/min of revolution; the rotating speed of high-speed stirring is as follows: rotation 275-.
Further, in the step S3), the time for low-speed stirring is 100-150S, the standing time is 10-20S, and the time for high-speed stirring is 100-150S.
The invention also provides a using method of the epoxy resin modified crack repairing mortar, the epoxy resin modified crack repairing mortar is uniformly stirred and coated on cracks on the surface of an industrial or civil cracked concrete building, and the width of the cracks is 0.3-2.5 mm.
The common silicate cement is an inorganic cementing material, can permeate through the cracks of concrete, generates hydration products such as hydrated calcium silicate gel and the like through hydration reaction, generates strength after hardening, fills the cracks and bonds the crack walls into a whole. The slag powder contains active silicon dioxide and aluminum oxide, has certain reaction activity and self-hardening, reacts to generate low-calcium hydrated calcium silicate gel, excites and improves the hydration speed of common calcium silicate cement, improves the repaired microstructure and further repairs the compactness of the hardened mortar. The polycarboxylic acid high-efficiency water reducing agent molecules are adsorbed on the surfaces of cement particles, and the dispersing effect of the polycarboxylic acid high-efficiency water reducing agent molecules can open a flocculation structure to release wrapped water, so that the fluidity of the crack repairing mortar is increased, the slurry has better fluidity and smoothly goes deep into fine cracks in the depths of the cracks, and the effect of repairing and bonding is achieved. The standard sand plays a role in skeleton and support in the crack filling mortar, and simultaneously inhibits the shrinkage of cement paste to prevent cracking. The molecular structure of the epoxy resin contains a large amount of hydroxyl and ether groups, so that the epoxy resin emulsion has strong adhesive capacity and small shrinkage, the bonding strength of the crack repairing mortar and the crack wall is increased, and the shrinkage after hardening is reduced; the epoxy resin emulsion has better permeability, and can quickly enter and fill the interior of the micro-pores through the pores of the concrete; the mortar is uniformly dispersed in water, the water content is gradually reduced along with the hydration of cement, the mortar is gradually condensed into a film, the film exists in gaps of the mortar after the film is formed, the strength and the compactness of the mortar are improved, and the anti-carbonization capability and the anti-chloride ion permeability of the crack repairing mortar are enhanced.
The invention is gray slurry, and when in use, the slurry is filled according to the size of a crack.
The mortar is used as the concrete crack repairing mortar, can effectively penetrate into the interior from a concrete crack, fills the internal fine pores, has good fluidity and water retention property, has high bonding strength after hardening to bond the crack walls into a whole, improves the compactness after hardening, enhances the chloride ion permeation resistance, the carbonization resistance and the freeze-thaw cycle resistance, and has good durability.
The invention has no corrosion effect on the steel bars in the concrete structure, and can be widely applied to repairing the surfaces of cracked concrete buildings in industry and civilian use.
Detailed Description
The technical solution of the present invention is further explained below according to specific embodiments.
The invention relates to epoxy resin modified crack repair mortar, which comprises the following components in percentage by weight:
polycarboxylic acid high-efficiency water reducing agent: 0.2-1%, standard sand: 34-73.8%, 1-5% of epoxy resin emulsion, and a cementing material: 25 to 60 percent.
The epoxy resin modified crack repair mortar comprises the following components in percentage by weight:
polycarboxylic acid high-efficiency water reducing agent: 0.33-0.82%, standard sand: 44-63.77%, epoxy resin emulsion 2.2-4.5%, and a cementing material: 33.7 to 51.4 percent.
The cementing material is ordinary portland cement, II-grade slag powder and water; the mass percent of the ordinary Portland cement is 20-40%, the mass percent of the II-grade slag powder is 5-20%, and the balance is water.
The epoxy resin modified crack repair mortar comprises the following components in percentage by weight: 0.69 wt% of polycarboxylic acid high-efficiency water reducing agent, 58.51 wt% of standard sand, 2.3 wt% of epoxy resin emulsion, 38.5 wt% of cementing material, 25 wt% of ordinary portland cement in the cementing material, 10.5 wt% of II-grade slag powder and the balance of water.
The epoxy resin modified crack repair mortar comprises the following components in percentage by weight: 0.84% of polycarboxylic acid high-efficiency water reducing agent, 50.46% of standard sand, 2.8% of epoxy resin emulsion, 45.9% of cementing material, 33.5% of ordinary portland cement, 8.4% of II-grade slag powder and the balance of water.
The invention also aims to provide a method for preparing the epoxy resin modified crack repair mortar, which specifically comprises the following steps:
s1) weighing each component according to the design components for later use;
s2) mixing the epoxy resin emulsion with water uniformly, mixing by adopting a physical machine, and adding other components;
s3), stirring at a low speed, standing, and then stirring at a high speed to obtain the epoxy resin modified crack repair mortar.
The net slurry fluidity of the epoxy resin modified crack repair mortar can reach 190mm, the compressive strength after 28 days of hardening is not lower than 61.7MPa, the breaking strength is not lower than 11.4MPa, the compression-shear bonding strength is not lower than 7.4MPa, and the mass loss rate after 300 times of freeze-thaw cycles is not higher than 0.31%.
The rotation speed of the low-speed stirring in the S3) is 150r/min of rotation 130 and 55-70r/min of revolution; the rotating speed of high-speed stirring is as follows: rotation 275-.
The time for low-speed stirring in S3) is 100-150S, the standing time is 10-20S, and the time for high-speed stirring is 100-150S.
The use method of the epoxy resin modified crack repairing mortar comprises the steps of uniformly stirring the epoxy resin modified crack repairing mortar, smearing the epoxy resin modified crack repairing mortar to the crack, wherein the diameter of the crack is 0.3-2.5mm, the compressive strength of the crack after hardening is not lower than 61.7MPa after 28 days, the breaking strength is not lower than 11.4MPa, the compression-shear bonding strength is not lower than 7.4MPa, and the mass loss rate of the epoxy resin modified crack repairing mortar after 300 times of freeze-thaw cycles is not higher than 0.31%.
Example one
The epoxy resin modified crack repair mortar is prepared from 0.69 wt% of polycarboxylic acid high-efficiency water reducing agent, 58.51 wt% of standard sand, 2.3 wt% of epoxy resin emulsion, 38.5 wt% of cementing material, 25 wt% of ordinary portland cement in the cementing material, 10.5 wt% of II-grade slag powder and the balance water. After stirring, the net slurry fluidity of the product can reach 190mm, the compressive strength after hardening is 61.7MPa after 28 days, the breaking strength is 11.4MPa, the compression-shear bonding strength reaches 7.4MPa, and the mass loss rate after 300 times of freeze-thaw cycles is 0.31%.
Example two
The epoxy resin modified crack repair mortar is prepared from 0.84 wt% of polycarboxylic acid high-efficiency water reducing agent, 50.46 wt% of standard sand, 2.8 wt% of epoxy resin emulsion, 45.9 wt% of cementing material, 33.5 wt% of ordinary portland cement in the cementing material, 8.4 wt% of II-grade slag powder and the balance of water. After stirring, the net slurry fluidity of the product can reach 190mm, the compressive strength after 28 days of hardening is 64.2MPa, the breaking strength is 12.3MPa, the compression-shear bonding strength reaches 9.5MPa, and the mass loss rate after 300 times of freeze-thaw cycles is 0.28%.
The epoxy resin modified crack repair mortar provided by the embodiment of the application and the preparation and use methods thereof are described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The epoxy resin modified crack repair mortar is characterized by comprising the following components in percentage by weight:
polycarboxylic acid high-efficiency water reducing agent: 0.2-1%, standard sand: 34-73.8%, 1-5% of epoxy resin emulsion, and a cementing material: 25 to 60 percent.
2. The epoxy resin modified crack repair mortar of claim 1, wherein the weight percentages of the components of the epoxy resin modified crack repair mortar are as follows:
polycarboxylic acid high-efficiency water reducing agent: 0.33-0.82%, standard sand: 44-63.77%, epoxy resin emulsion 2.2-4.5%, and a cementing material: 33.7 to 51.4 percent.
3. The epoxy resin modified crack repair mortar of claim 1 or 2, wherein the cementitious material is ordinary portland cement, grade ii slag powder, and water; the mass percent of the ordinary Portland cement is 20-40%, the mass percent of the II-grade slag powder is 5-20%, and the balance is water.
4. The epoxy resin modified crack repair mortar of claim 3, wherein the weight percentages of the components of the epoxy resin modified crack repair mortar are as follows: 0.69 percent of polycarboxylic acid high-efficiency water reducing agent, 58.51 percent of standard sand, 2.3 percent of epoxy resin emulsion, 38.5 percent of cementing material, 25 percent of ordinary portland cement in the cementing material, 10.5 percent of II-grade slag powder and the balance of water.
5. The epoxy resin modified crack repair mortar of claim 3, wherein the weight percentages of the components of the epoxy resin modified crack repair mortar are as follows: 0.84% of polycarboxylic acid high-efficiency water reducing agent, 50.46% of standard sand, 2.8% of epoxy resin emulsion, 45.9% of cementing material, 33.5% of ordinary portland cement in the cementing material, 8.4% of II-grade slag powder and the balance of water.
6. A method for preparing the epoxy resin modified crack repair mortar of any one of claims 1 to 5, wherein the method specifically comprises the following steps:
s1) weighing each component according to the design components for later use;
s2) mixing the epoxy resin emulsion with water uniformly, mixing by adopting a physical machine, and adding other components;
s3), stirring at a low speed, standing, and then stirring at a high speed to obtain the epoxy resin modified crack repair mortar.
7. The method according to claim 6, wherein the net slurry fluidity of the epoxy resin modified crack repair mortar can reach 190mm, the compressive strength after 28 days of hardening is not lower than 61.7MPa, the breaking strength is not lower than 11.4MPa, the compression-shear bonding strength is not lower than 7.4MPa, and the mass loss rate after 300 freeze-thaw cycles is not higher than 0.31%.
8. The method as claimed in claim 6, wherein the rotation speed of the low-speed stirring in S3) is 150r/min for rotation 130 and 55-70r/min for revolution; the rotating speed of high-speed stirring is as follows: rotation 275-.
9. The method as claimed in claim 6, wherein the time for the low-speed stirring in S3) is 100-150S, the standing time is 10-20S, and the time for the high-speed stirring is 100-150S.
10. The use method of the epoxy resin modified crack repair mortar of any one of claims 1 to 9, wherein the epoxy resin modified crack repair mortar is uniformly stirred and applied to cracks on the surface of an industrial or civil cracked concrete building, and the width of the cracks is 0.3 to 2.5 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079893.9A CN111285646A (en) | 2020-02-04 | 2020-02-04 | Epoxy resin modified crack repair mortar and preparation and use methods thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010079893.9A CN111285646A (en) | 2020-02-04 | 2020-02-04 | Epoxy resin modified crack repair mortar and preparation and use methods thereof |
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| CN111285646A true CN111285646A (en) | 2020-06-16 |
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| CN202010079893.9A Pending CN111285646A (en) | 2020-02-04 | 2020-02-04 | Epoxy resin modified crack repair mortar and preparation and use methods thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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