CN109516747B - Concrete repairing material and preparation method thereof - Google Patents
Concrete repairing material and preparation method thereof Download PDFInfo
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- CN109516747B CN109516747B CN201811605908.XA CN201811605908A CN109516747B CN 109516747 B CN109516747 B CN 109516747B CN 201811605908 A CN201811605908 A CN 201811605908A CN 109516747 B CN109516747 B CN 109516747B
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- 239000008096 xylene Substances 0.000 claims description 5
- YJKHMSPWWGBKTN-UHFFFAOYSA-N 2,2,3,3,4,4,5,5,6,6,7,7-dodecafluoroheptyl 2-methylprop-2-enoate Chemical compound CC(=C)C(=O)OCC(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)C(F)F YJKHMSPWWGBKTN-UHFFFAOYSA-N 0.000 claims description 4
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- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 2
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- 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
Abstract
The invention discloses a concrete repair material which comprises the following raw materials in percentage by weight: 30-35 parts of sulphoaluminate cement, 8-10 parts of quartz sand, 6-8 parts of river sand, 20-25 parts of epoxy-polyurethane composite material, 2-4 parts of heat release material, 2-3 parts of heat change material, 2-3 parts of water reducing agent, 0.5-0.6 part of anionic surfactant and 1-2 parts of retarder. After the crack is added in the initial period, the heat-variable material can be heated to shrink, and then the heat-variable material can be left in enough space to allow other polymer materials and base materials to flow into the gap, so that more base materials and polymers can be accommodated in the gap, and after the heat is dissipated, the heat-variable material can be expanded, so that the base materials and the polymers can fully fill the crack, and the higher repairing strength is realized.
Description
Technical Field
The invention relates to a repair material, in particular to a concrete repair material and a preparation method thereof, and belongs to the technical field of constructional engineering.
Background
The cement pavement has the advantages of good construction performance, excellent durability, firm pavement structure, strong load diffusion capacity, large frictional resistance, good skid resistance, good wear resistance, good temperature and water stability, long service life, low maintenance cost and the like. However, cement concrete pavements also have fatal defects, such as cracks, broken plates, local depressions or staggered platforms, cracks and loosening to cause local crushing and scattering into small blocks, peeling and peeling, local loosening to form pot holes, slag falling or bone exposed surfaces and the like, when certain defects exist in the aspects of use conditions, environmental conditions, roadbed construction quality, materials and the like. Once the damage occurs, if the damage is not repaired in time, the damage will rapidly develop and spread to the surrounding area, thereby forming a larger area of damage. When the local damage reaches a serious degree, the driving comfort of the road surface is influenced, and vehicles can be damaged or even traffic accidents can be caused. In view of the fact that various early-stage local damages of the cement concrete pavement can cause more serious consequences, the research on the rapid cement concrete repairing material and the method has important significance for the development and the use of the cement concrete pavement.
In general, there are three main approaches to formulating (ultra) early strength concrete: the early strength quick-hardening special cement is utilized, and early strength agents or various additives and special mineral admixture are used. The higher fluidity of cement concrete substantially increases the amount of water used for effective mixing, but the excess water easily forms a large amount of pores in the set cement or in the aggregate interface region, and the pores are the main reasons for the poor performance of the concrete.
Therefore, the inorganic repairing material adopted in the prior art can not effectively penetrate cracks in concrete cracks, and the polymer repairing material has the problem of low strength and restricts the concrete repairing engineering.
Disclosure of Invention
The invention mainly aims to provide a concrete repairing material which integrates the characteristics of concrete, polymer elastic materials, heat-release materials and heat-change materials, has excellent early strength performance, ultraviolet resistance and repairing strength when used in cooperation, and can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
the concrete repair material comprises the following raw materials in percentage by weight: 30-35 parts of sulphoaluminate cement, 8-10 parts of quartz sand, 6-8 parts of river sand, 20-25 parts of epoxy-polyurethane composite material, 2-4 parts of heat release material, 2-3 parts of heat change material, 2-3 parts of water reducing agent, 0.5-0.6 part of anionic surfactant and 1-2 parts of retarder.
Further, the preparation method of the epoxy-polyurethane composite material comprises the following steps:
step 1a, preparing fluorine modified acrylic resin, mixing 15-20 parts of dimethylbenzene and 18-25 parts of butyl acetate according to parts by weight to serve as a mixed solvent, and heating to 90-95 ℃; then uniformly mixing 12-14 parts of styrene, 5-10 parts of methyl methacrylate, 20-24 parts of butyl acrylate, 6-8 parts of acrylic acid, 3-5 parts of dodecafluoroheptyl methacrylate, 0.5-0.8 part of dibenzoyl peroxide, 5-10 parts of xylene and 12-15 parts of butyl acetate to obtain a monomer mixture; dropwise adding the monomer mixture into the mixed solvent for reaction; after the dropwise addition, continuing to perform heat preservation reaction for 2-4h, cooling, filtering and discharging to obtain fluorine modified acrylic resin;
step 1b, preparing modified epoxy resin, namely heating 30-50 parts by weight of E44 epoxy resin to 60-70 ℃, dropwise adding 15-20 parts by weight of fluorine modified acrylic resin and 1-3 parts by weight of catalyst triethylamine, heating to 100 ℃ and 110 ℃ after dropwise adding, continuing to react for 1-2h, cooling, filtering and discharging to obtain the modified epoxy resin;
step 1c, preparing a polyurethane prepolymer, namely heating 15-20 parts by weight of polypropylene glycol ether to 50-55 ℃, then dropwise adding 10-15 parts by weight of toluene diisocyanate, heating to 70-80 ℃ after dropwise adding, reacting for 1-2 hours, and cooling to obtain the polyurethane prepolymer;
and step 1d, carrying out crosslinking reaction on 20-25 parts of modified epoxy resin, 18-30 parts of polyurethane prepolymer, 0.3-0.5 part of initiator azobisisobutyronitrile, 2-4 parts of ethylenediamine and 15-30 parts of nano silicon oxide at the reaction temperature of 70-80 ℃ for 2-3h, and obtaining the epoxy-polyurethane composite material after the reaction is finished.
Further, the preparation method of the heat-variable material comprises the following steps: under the atmosphere of nitrogen, according to parts by weight, 20-30 parts of N-isopropyl acrylamide, 1-3 parts of N, N' -methylene bisacrylamide, 0.1-0.2 part of photoinitiator alpha-oxoglutaric acid and 240 parts of water are uniformly mixed, and the photo-initiated polymerization reaction is carried out under the irradiation of ultraviolet light, the reaction temperature is controlled at 25-35 ℃, and the reaction time is 2-3 hours, so that the heat-changing material is obtained.
Further, the anionic surfactant is an alkylbenzene sulfonate surfactant, the water reducing agent is an aminobenzene sulfonic acid water reducing agent, and the retarder is borax.
Furthermore, the particle size range of the quartz sand is 0.5-8mm, and the particle size range of the river sand is 1-2 mm.
Further, the exothermic material is an alkali metal oxide or an alkaline earth metal oxide.
Further, the exothermic material is calcium oxide or magnesium oxide.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly heating sulphoaluminate cement, quartz sand, river sand and thermal change materials to 30-35 ℃ and mixing for 15-20 min;
step 2), adding the epoxy-polyurethane composite material, the water reducing agent, the anionic surfactant and the retarder, and mixing for 10-15min at 20-25 ℃;
and 3) adding a heat release material, and mixing for 10-15min at 20-25 ℃.
Compared with the prior art, the invention has the following beneficial effects:
the material for repairing the concrete crack provided by the invention firstly utilizes cement, quartz sand and river sand as base materials and is used for providing enough strength after the repairing material is cured; the adopted epoxy-polyurethane composite material not only has certain fluidity, but also keeps better elasticity, so that the repair material can keep certain fluidity at the initial stage, the material is uniformly infiltrated and filled, and the strength after curing is improved; in the added epoxy-polyurethane composite material, fluorinated modified acrylic acid is adopted to modify epoxy resin, so that the durability of the repair material under an ultraviolet condition is improved; the heat release material and the thermal change material are matched with each other, the heat release material can release heat after meeting water, the thermal change material adopts thermal change monomer N-isopropyl acrylamide, the material can shrink after being heated, therefore, after the crack is added in the initial stage, the thermal change material can leave enough space after being heated and shrunk to allow other polymer materials and base materials to flow into the gap, so that more base materials and polymers are accommodated in the gap, and after the heat is dissipated, the thermal change material can expand to fully fill the crack with the base materials and the polymers, so that the high repairing strength is realized.
Drawings
FIG. 1 is a graph showing the effect of the particle size of quartz sand on the repair effect;
FIG. 2 is a graph showing the effect of the amount of epoxy-polyurethane composite on the repair effect.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
The following examples demonstrate the advantages of this solution through data support.
Example 1
Preparation of epoxy-polyurethane composite material:
step 1a, preparation of fluorine modified acrylic resin: mixing 15 parts of dimethylbenzene and 18 parts of butyl acetate by weight to serve as a mixed solvent, and heating to 90 ℃; then 14 parts of styrene, 10 parts of methyl methacrylate, 24 parts of butyl acrylate, 8 parts of acrylic acid, 5 parts of dodecafluoroheptyl methacrylate, 0.5 part of dibenzoyl peroxide, 5 parts of xylene and 12 parts of butyl acetate are uniformly mixed to obtain a monomer mixture; dropwise adding the monomer mixture into the mixed solvent for reaction; after the dropwise addition, continuing the heat preservation reaction for 4 hours, cooling, filtering and discharging to obtain fluorine modified acrylic resin;
step 1b, preparation of modified epoxy resin: heating 50 parts by weight of E44 epoxy resin to 70 ℃, dropping 20 parts by weight of fluorine modified acrylic resin and 1 part by weight of catalyst triethylamine, heating to 100 ℃ after dropping, continuing to react for 1h, cooling, filtering and discharging to obtain modified epoxy resin;
step 1c, preparation of polyurethane prepolymer: heating 15 parts by weight of polypropylene glycol ether to 50 ℃, then dropwise adding 10 parts by weight of toluene diisocyanate, heating to 80 ℃ after dropwise adding, reacting for 2 hours, and cooling to obtain a polyurethane prepolymer;
step 1d, preparation of the epoxy-polyurethane composite material: according to the weight parts, 25 parts of modified epoxy resin, 30 parts of polyurethane prepolymer, 0.3 part of initiator azobisisobutyronitrile, 2 parts of ethylenediamine and 30 parts of nano silicon oxide are subjected to crosslinking reaction at the reaction temperature of 70 ℃ for 3 hours, and the epoxy-polyurethane composite material is obtained after the reaction is finished.
Preparation of heat-altered material:
under the atmosphere of nitrogen, 30 parts of N-isopropyl acrylamide, 3 parts of N, N' -methylene bisacrylamide, 0.2 part of photoinitiator alpha-oxoglutaric acid and 240 parts of water are uniformly mixed according to parts by weight, and the photo-initiated polymerization reaction is carried out under the irradiation of ultraviolet light, wherein the reaction temperature is controlled at 35 ℃ and the reaction time is 2 hours, so that the thermal change material is obtained.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly, heating 30 parts of sulphoaluminate cement, 8 parts of quartz sand, 8 parts of river sand (with the particle size range of 1-2mm) and 3 parts of thermal change material to 35 ℃ and mixing for 20 min;
step 2), adding 20 parts of epoxy-polyurethane composite material, 2 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 2 parts of retarder borax, and mixing for 10min at 25 ℃;
and step 3), adding 2 parts of calcium oxide, and mixing for 10min at 20 ℃.
The common specifications of the quartz sand are 0.5-1mm, 1-2mm, 2-4mm and 4-8 mm; the above preparation processes respectively examine the influence of the 4 kinds of regular quartz sand on the repairing effect.
The prepared concrete repair material is used: mixing the concrete repairing material and water according to the weight ratio of 4-5: 0.2 to 0.3, filling the mixture into concrete cracks, and curing for 7 to 10 days. The following examples and comparative examples use the same concrete repair material as in example 1.
Example 2
Preparation of epoxy-polyurethane composite material:
step 1a, preparation of fluorine modified acrylic resin: mixing 15 parts of dimethylbenzene and 18 parts of butyl acetate by weight to serve as a mixed solvent, and heating to 90 ℃; then uniformly mixing 12 parts of styrene, 5 parts of methyl methacrylate, 20 parts of butyl acrylate, 6 parts of acrylic acid, 3 parts of dodecafluoroheptyl methacrylate, 0.5 part of dibenzoyl peroxide, 10 parts of xylene and 15 parts of butyl acetate to obtain a monomer mixture; dropwise adding the monomer mixture into the mixed solvent for reaction; after the dropwise addition, continuing the heat preservation reaction for 4 hours, cooling, filtering and discharging to obtain fluorine modified acrylic resin;
step 1b, preparation of modified epoxy resin: heating 50 parts by weight of E44 epoxy resin to 70 ℃, dropping 20 parts by weight of fluorine modified acrylic resin and 1 part by weight of catalyst triethylamine, heating to 100 ℃ after dropping, continuing to react for 1-2h, cooling, filtering and discharging to obtain modified epoxy resin;
step 1c, preparation of polyurethane prepolymer: heating 15 parts by weight of polypropylene glycol ether to 50 ℃, then dropwise adding 10 parts by weight of toluene diisocyanate, heating to 70 ℃ after dropwise adding, reacting for 1h, and cooling to obtain a polyurethane prepolymer;
step 1d, preparation of the epoxy-polyurethane composite material: according to the weight parts, 25 parts of modified epoxy resin, 30 parts of polyurethane prepolymer, 0.5 part of initiator azobisisobutyronitrile, 4 parts of ethylenediamine and 30 parts of nano silicon oxide are subjected to crosslinking reaction at the reaction temperature of 80 ℃ for 3 hours, and the epoxy-polyurethane composite material is obtained after the reaction is finished.
Preparation of heat-altered material:
under the atmosphere of nitrogen, according to parts by weight, 20 parts of N-isopropyl acrylamide, 1-3 parts of N, N' -methylene bisacrylamide, 0.2 part of photoinitiator alpha-oxoglutaric acid and 180 parts of water are uniformly mixed, and the mixture is subjected to photo-initiated polymerization reaction under the irradiation of ultraviolet light, wherein the reaction temperature is controlled at 25 ℃ and the reaction time is 2 hours, so that the heat-changing material is obtained.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly, heating 30 parts of sulphoaluminate cement, 8 parts of quartz sand (with the particle size range of 2-4mm), 6 parts of river sand (with the particle size range of 1-2mm) and 3 parts of thermal change material to 35 ℃ and mixing for 20 min;
step 2), adding an epoxy-polyurethane composite material, 3 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 1 part of retarder borax, and mixing for 15min at 20 ℃;
and step 3), adding 2 parts of calcium oxide, and mixing for 15min at 25 ℃.
The influence of the amount of the epoxy-polyurethane composite material in 10-25 parts on the repairing effect is examined.
Comparative example 1
The difference from example 1 is that no river sand was added and its weight was replaced by quartz sand.
Preparation of epoxy-polyurethane composite material: the preparation method is the same as example 1.
Preparation of heat-altered material: the preparation method is the same as example 1.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly, heating 30 parts of sulphoaluminate cement, 16 parts of quartz sand (with the particle size range of 2-4mm) and 3 parts of thermal change material to 35 ℃ and mixing for 20 min;
step 2), adding 20 parts of epoxy-polyurethane composite material, 2 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 2 parts of retarder borax, and mixing for 10min at 25 ℃;
and step 3), adding 2 parts of calcium oxide, and mixing for 10min at 20 ℃.
Comparative example 2
The difference from example 1 is that the acrylic acid in the epoxy-polyurethane material is not modified with a fluorine-containing monomer.
Preparation of epoxy-polyurethane composite material:
step 1a, preparation of modified acrylic resin: mixing 15 parts of dimethylbenzene and 18 parts of butyl acetate by weight to serve as a mixed solvent, and heating to 90 ℃; then, 14 parts of styrene, 10 parts of methyl methacrylate, 24 parts of butyl acrylate, 8 parts of acrylic acid, 0.5 part of dibenzoyl peroxide, 5 parts of xylene and 12 parts of butyl acetate are uniformly mixed to obtain a monomer mixture; dropwise adding the monomer mixture into the mixed solvent for reaction; after the dropwise addition, continuing the heat preservation reaction for 4 hours, cooling, filtering and discharging to obtain modified acrylic resin;
step 1b, preparation of modified epoxy resin: heating 50 parts by weight of E44 epoxy resin to 70 ℃, beginning to dropwise add 20 parts by weight of modified acrylic resin and 1 part by weight of triethylamine serving as a catalyst, after dropwise addition, heating to 100 ℃, continuing to react for 1 hour, cooling, filtering and discharging to obtain modified epoxy resin;
step 1c, preparation of polyurethane prepolymer: heating 15 parts by weight of polypropylene glycol ether to 50 ℃, then dropwise adding 10 parts by weight of toluene diisocyanate, heating to 80 ℃ after dropwise adding, reacting for 2 hours, and cooling to obtain a polyurethane prepolymer;
step 1d, preparation of the epoxy-polyurethane composite material: according to the weight parts, 25 parts of modified epoxy resin, 30 parts of polyurethane prepolymer, 0.3 part of initiator azobisisobutyronitrile, 2 parts of ethylenediamine and 30 parts of nano silicon oxide are subjected to crosslinking reaction at the reaction temperature of 70 ℃ for 3 hours, and the epoxy-polyurethane composite material is obtained after the reaction is finished.
Preparation of heat-altered material: the preparation method is the same as example 1.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly, heating 30 parts of sulphoaluminate cement, 8 parts of quartz sand (with the particle size range of 2-4mm), 8 parts of river sand (with the particle size range of 1-2mm) and 3 parts of thermal change material to 35 ℃ and mixing for 20 min;
step 2), adding 20 parts of epoxy-polyurethane composite material, 2 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 2 parts of retarder borax, and mixing for 10min at 25 ℃;
and step 3), adding 2 parts of calcium oxide, and mixing for 10min at 20 ℃.
Comparative example 3
The difference from example 1 is that no exothermic material was added.
Preparation of epoxy-polyurethane composite material: the preparation method is the same as example 1.
Preparation of heat-altered material: the preparation method is the same as example 1.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly, heating 30 parts of sulphoaluminate cement, 8 parts of quartz sand (with the particle size range of 2-4mm), 8 parts of river sand (with the particle size range of 1-2mm) and 3 parts of thermal change material to 35 ℃ and mixing for 20 min;
and step 2), adding 20 parts of epoxy-polyurethane composite material, 2 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 2 parts of retarder borax, and mixing for 10min at 25 ℃.
Comparative example 4
The difference from example 1 is that no heat-altered material was added.
Preparation of epoxy-polyurethane composite material: the preparation method is the same as example 1.
A preparation method of a concrete repair material comprises the following steps:
step 1), firstly heating 30 parts of sulphoaluminate cement, 8 parts of quartz sand (with the particle size range of 2-4mm) and 8 parts of river sand (with the particle size range of 1-2mm) to 35 ℃ and mixing for 20 min;
step 2), adding 20 parts of epoxy-polyurethane composite material, 2 parts of aminobenzene sulfonic acid water reducing agent, 0.6 part of alkylbenzene sulfonate anionic surfactant and 2 parts of retarder borax, and mixing for 10min at 25 ℃;
and step 3), adding 2 parts of calcium oxide, and mixing for 10min at 20 ℃.
Repair experiment
Test specimen
The method adopts a concrete test block with a gap, a bending test piece is in a long strip shape, and the size of a test piece die is 120mm multiplied by 15mm multiplied by 10 mm. And injecting the prepared repairing material into a bending test piece mold, sealing, and curing for 7d at normal temperature.
Flexural strength and tensile strength
The current situation and the size of the bending test piece are the same as those of the shrinkage test piece. The tensile test piece is a dumbbell-shaped test piece, and the total length is 170 mm; the length of the middle part is 55mm, the width of the end part is 20mm, and the width of the middle part is 10 mm; the radius of the transition arc is 75 mm, the thickness is 10mm, and the distance between the clamps is 110 mm.
And respectively measuring the bending strength and the tensile strength of the cured bending test piece and the cured tensile test piece by using a CSS-2205 type electronic universal tester. Flexural and tensile strength tests were carried out in accordance with GB1040-79 and flexural strength measurements were carried out using static three-point loading. The sample is placed on two supports, and a concentrated load is applied to the sample part at the midpoint of the two supports at a speed of 50mm/min, so that the sample generates bending stress and deformation. The tensile strength was measured by applying a tensile load in the axial direction of the specimen at a rate of 50mm/min, and breaking the specimen.
Adhesive strength
The flexural strength is used as an index of the adhesive strength. Firstly, breaking a 40 mm multiplied by 160 mm mortar test piece on an anti-bending machine, splicing the broken mortar test piece together according to the original test piece, reserving a gap of 3-4 mm between two broken surfaces, sealing and fixing three surfaces of the mortar test piece by using an adhesive tape, injecting a prepared repairing material into the gap from the unsealed surface, properly airing for 8-10 min, curing at room temperature after the gap is completely filled, measuring the anti-bending strength of the mortar test piece, and observing the condition of a new section.
Ultraviolet accelerated aging test
The ultraviolet artificial accelerated aging experiment is carried out according to GB/T16422.3-1997, and a fluorescent ultraviolet lamp is adopted during the experiment, the wavelength of the ultraviolet light is 285 nm, and the power is 30W. The test piece was placed at about 50 cm under ultraviolet light and after 30 days of irradiation, the effect of aging resistance of the material was measured by measuring the bending and tensile strength.
Cold and hot cycle performance
The cold-hot cycle test was carried out by placing the repair material at room temperature (about 15 ℃) for 30 min, immediately placing it in a freezer at-20 ℃ for 30 min, and performing a total of 100 cycles as one cycle. And then testing the thermal shock performance of the material by testing the bending and tensile strength of the material and observing whether the surface has phenomena of foaming, peeling, delaminating, cracking and the like.
Effect of base stock particle size on repair Effect
The repair materials prepared using the different quartz sand grain sizes of example 1, and the sample performance data obtained under different conditions are as follows:
as can be seen from the table, when aggregates having different particle sizes were used, the strength of the samples of the prepared patching materials was different. The quartz sand with the grain diameter of 2-4mm can have higher tensile strength and bending strength of a sample, and the sample can still keep better strength after being damaged by ultraviolet and cold and hot circulation, which is superior to other grain diameters.
Effect of the amount of epoxy-polyurethane composite on the repair Effect
The repair materials prepared using the different amounts of epoxy-polyurethane composite material in example 2, and the sample performance data obtained under different conditions are as follows:
the change curves of tensile strength and bending strength under different dosage are shown in figure 2, and it can be seen that when the dosage of the polymer composite material is controlled at 20 parts, the strength of the repairing sample can be kept well, mainly because the composite material can not only meet the requirement of filling gaps of concrete, but also keep compatible with the base material, so that the material has good strength after being cured.
Effect of different preparation Material conditions on the repair Effect
The characterization results of the quartz sand group with the particle size of 2-4mm in example 1 and the repair tests of the materials in comparative examples 1-4 are used, and the results are shown as follows:
as can be seen from comparison between example 1 and comparative example 1, the river sand has a small particle size, and the river sand can be effectively filled in the internal space of quartz sand, so that the strength of the formed solidified sample is higher;
compared with the comparative example 2, it can be seen that the modified epoxy-polyurethane material adopted is not modified by the fluorine-containing monomer, and the retention rate of tensile strength and bending strength after the ultraviolet failure test is obviously lower than that of the group in the example 1, which shows that the strength of the concrete repairing material after curing is improved by the adopted modified composite material;
compared with the group of the comparative example 3, the heat change material can not effectively achieve the purposes of enabling the aggregate and the polymer composite material to be effectively mutually compatible and filling gaps through heat change when the calcium oxide component with water-heating property is not used, so that the problem of poor strength still exists after the repair material is cured;
compared with the group of comparative example 4, the application of the thermal change material can effectively solve the problem of low repairing strength caused by the problems of poor gap filling between the traditional organic-inorganic composite material and concrete, gaps between repairing materials and the like.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. A concrete repair material is characterized in that: the composite material consists of the following raw materials in percentage by weight: 30-35 parts of sulphoaluminate cement, 8-10 parts of quartz sand, 6-8 parts of river sand, 20-25 parts of epoxy-polyurethane composite material, 2-4 parts of heat release material, 2-3 parts of heat change material, 2-3 parts of water reducing agent, 0.5-0.6 part of anionic surfactant and 1-2 parts of retarder; the preparation method of the thermal change material comprises the following steps: under the atmosphere of nitrogen, according to parts by weight, 20-30 parts of N-isopropyl acrylamide, 1-3 parts of N, N' -methylene bisacrylamide, 0.1-0.2 part of photoinitiator alpha-oxoglutaric acid and 240 parts of water are uniformly mixed, and the photo-initiated polymerization reaction is carried out under the irradiation of ultraviolet light, the reaction temperature is controlled at 25-35 ℃, and the reaction time is 2-3 hours, so that the heat-changing material is obtained.
2. The concrete repair material according to claim 1, wherein the epoxy-polyurethane composite is prepared according to the following method:
step 1a, preparing fluorine modified acrylic resin, mixing 15-20 parts of dimethylbenzene and 18-25 parts of butyl acetate according to parts by weight to serve as a mixed solvent, and heating to 90-95 ℃; then uniformly mixing 12-14 parts of styrene, 5-10 parts of methyl methacrylate, 20-24 parts of butyl acrylate, 6-8 parts of acrylic acid, 3-5 parts of dodecafluoroheptyl methacrylate, 0.5-0.8 part of dibenzoyl peroxide, 5-10 parts of xylene and 12-15 parts of butyl acetate to obtain a monomer mixture; dropwise adding the monomer mixture into the mixed solvent for reaction; after the dropwise addition, continuing to perform heat preservation reaction for 2-4h, cooling, filtering and discharging to obtain fluorine modified acrylic resin;
step 1b, preparing modified epoxy resin, namely heating 30-50 parts by weight of E44 epoxy resin to 60-70 ℃, dropwise adding 15-20 parts by weight of fluorine modified acrylic resin and 1-3 parts by weight of catalyst triethylamine, heating to 100 ℃ and 110 ℃ after dropwise adding, continuing to react for 1-2h, cooling, filtering and discharging to obtain the modified epoxy resin;
step 1c, preparing a polyurethane prepolymer, namely heating 15-20 parts by weight of polypropylene glycol ether to 50-55 ℃, then dropwise adding 10-15 parts by weight of toluene diisocyanate, heating to 70-80 ℃ after dropwise adding, reacting for 1-2 hours, and cooling to obtain the polyurethane prepolymer;
and step 1d, carrying out crosslinking reaction on 20-25 parts of modified epoxy resin, 18-30 parts of polyurethane prepolymer, 0.3-0.5 part of initiator azobisisobutyronitrile, 2-4 parts of ethylenediamine and 15-30 parts of nano silicon oxide at the reaction temperature of 70-80 ℃ for 2-3h, and obtaining the epoxy-polyurethane composite material after the reaction is finished.
3. The concrete repair material according to claim 1, wherein the anionic surfactant is an alkylbenzene sulfonate surfactant, the water reducing agent is an aminobenzenesulfonic acid water reducing agent, and the retarder is borax.
4. The concrete repair material according to claim 1, wherein the quartz sand has a particle size ranging from 0.5 to 8mm, and the river sand has a particle size ranging from 1 to 2 mm.
5. A concrete repair material according to claim 1, wherein the exothermic material is an alkali metal oxide or an alkaline earth metal oxide.
6. A concrete repair material according to claim 5, wherein the exothermic material is calcium oxide or magnesium oxide.
7. A method of preparing a concrete repair material according to any one of claims 1 to 6, comprising the steps of:
step 1), mixing sulphoaluminate cement, quartz sand, river sand and thermal change materials, heating to above 30-35 ℃, and mixing for 15-20 min;
step 2), adding the epoxy-polyurethane composite material, the water reducing agent, the anionic surfactant and the retarder, and mixing for 10-15min at the temperature of more than 20-25 ℃;
and 3) adding a heat release material, and mixing for 10-15min at the temperature of more than 20-25 ℃.
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| JP6296600B2 (en) * | 2013-12-28 | 2018-03-20 | 太平洋マテリアル株式会社 | Premix grout composition |
| CN107892522A (en) * | 2017-11-03 | 2018-04-10 | 武汉理工大学 | Selfreparing cement concrete and preparation method thereof is frozen in a kind of salt resistance |
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| JP6296600B2 (en) * | 2013-12-28 | 2018-03-20 | 太平洋マテリアル株式会社 | Premix grout composition |
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