CN114751704A - Durable polymer mortar for high-strength steel wire cloth reinforced concrete member - Google Patents
Durable polymer mortar for high-strength steel wire cloth reinforced concrete member Download PDFInfo
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- CN114751704A CN114751704A CN202210517478.6A CN202210517478A CN114751704A CN 114751704 A CN114751704 A CN 114751704A CN 202210517478 A CN202210517478 A CN 202210517478A CN 114751704 A CN114751704 A CN 114751704A
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- steel wire
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- strength steel
- wire cloth
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 99
- 229920000642 polymer Polymers 0.000 title claims abstract description 82
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 69
- 239000010959 steel Substances 0.000 title claims abstract description 69
- 239000004744 fabric Substances 0.000 title claims abstract description 26
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 42
- 239000004568 cement Substances 0.000 claims abstract description 30
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 24
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- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- 239000000835 fiber Substances 0.000 claims abstract description 14
- 239000013008 thixotropic agent Substances 0.000 claims abstract description 13
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- 238000002156 mixing Methods 0.000 claims description 15
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- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid group Chemical group C(CC(O)(C(=O)O)CC(=O)O)(=O)O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
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- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 4
- SNAAJJQQZSMGQD-UHFFFAOYSA-N aluminum magnesium Chemical compound [Mg].[Al] SNAAJJQQZSMGQD-UHFFFAOYSA-N 0.000 claims description 4
- 239000001866 hydroxypropyl methyl cellulose Substances 0.000 claims description 4
- 235000010979 hydroxypropyl methyl cellulose Nutrition 0.000 claims description 4
- 229920003088 hydroxypropyl methyl cellulose Polymers 0.000 claims description 4
- UFVKGYZPFZQRLF-UHFFFAOYSA-N hydroxypropyl methyl cellulose Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC2C(C(O)C(OC3C(C(O)C(O)C(CO)O3)O)C(CO)O2)O)C(CO)O1 UFVKGYZPFZQRLF-UHFFFAOYSA-N 0.000 claims description 4
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical group [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 claims description 4
- 229910052808 lithium carbonate Inorganic materials 0.000 claims description 4
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 claims description 4
- 239000011975 tartaric acid Substances 0.000 claims description 4
- 235000002906 tartaric acid Nutrition 0.000 claims description 4
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 2
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
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- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 5
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 9
- 230000007774 longterm Effects 0.000 description 7
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- 238000013461 design Methods 0.000 description 2
- BCAARMUWIRURQS-UHFFFAOYSA-N dicalcium;oxocalcium;silicate Chemical compound [Ca+2].[Ca+2].[Ca]=O.[O-][Si]([O-])([O-])[O-] BCAARMUWIRURQS-UHFFFAOYSA-N 0.000 description 2
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
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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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/48—Metal
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
-
- 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
- C04B7/00—Hydraulic cements
- C04B7/02—Portland cement
-
- 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
- C04B2111/26—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
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
-
- 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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of building material mortar preparation, in particular to durable polymer mortar for a high-strength steel wire cloth reinforced concrete member. The traditional Chinese medicine is prepared from the following raw materials in parts by weight: 45-55 parts of cementing material, 38-45 parts of graded quartz sand, 3-5 parts of polymer rubber powder, 0.2-0.4 part of water reducing agent, 0.05-1 part of thixotropic agent, 0.05-0.2 part of retarder, 0.05-0.2 part of coagulant, 0.1-0.2 part of PP fiber and 3-5 parts of freeze-thaw resistant rust-resisting compacting agent. The reinforced mortar which is compounded by common Portland cement and sulphoaluminate cement as main cementing materials has small shrinkage value and good later strength, and the cement-based mortar is modified by adopting polymer glue powder and a freeze-thaw resistance rust-resisting compacting agent, so that the bonding strength between the repair mortar and the original concrete base layer, the bond strength between the repair mortar and the high-strength steel wire, and the durability of the high-strength steel wire-polymer mortar reinforced layer, such as water resistance, freeze-thaw resistance, chloride ion permeation resistance, and the like, are improved.
Description
Technical Field
The invention relates to the technical field of building material mortar preparation, in particular to durable polymer mortar for a high-strength steel wire cloth reinforced concrete member.
Background
The reinforced concrete is the building material with the largest use amount and the most extensive application in the building engineering. However, the concrete structure is degraded due to a series of factors such as the increase of the service life, the influence of the use environment or disasters, and the like, and the structure safety is seriously threatened, or the application of the original building is changed, or the original building cannot meet the requirements of the current new standard specifications, or some newly-built concrete projects fail to meet the design requirements due to design, construction and the like, and need to be repaired and reinforced. The buildings in China begin to advance from the first development period to the second and third development periods, the buildings built before the 90 th of the 20 th century are subjected to structural identification, modification and reinforcement in an initial scale, and the buildings gradually enter the maintenance and reinforcement era, so that the building reinforcement and modification industry has great development prospects. Meanwhile, the requirements on the bearing capacity and durability of the reinforced and transformed building structure are higher and higher.
The reinforcing method of the reinforced concrete structure is rich and various, and the conventional reinforcing methods mainly comprise a section enlarging method, a steel sticking reinforcing method, a carbon fiber sticking reinforcing method, a steel strand mesh-polymer mortar method and the like, but all have advantages and disadvantages. With the development of science and technology, reinforcement technology is gradually developed, and novel reinforcement methods are continuously appeared, wherein the high-strength steel wire cloth-polymer mortar reinforcement technology is proved to be safe, reliable, convenient to construct and excellent in performance through research and test of Europe and America university and independent authorities, and gradually becomes a novel reinforcement technology for replacing traditional steel plate reinforcement, composite fiber reinforcement and steel strand net-polymer mortar reinforcement.
The high-strength steel wire cloth-polymer mortar reinforcing system is composed of high-strength steel wire cloth, special reinforcing polymer mortar and high-molecular interface adhesive, and is characterized in that a unidirectional mesh cloth woven by specially-manufactured high-tensile-strength and high-modulus steel wires and a special reinforcing polymer mortar spraying and smearing composite reinforcing surface layer are bonded with an old concrete member and are stressed together, so that the purpose of repairing and reinforcing the old concrete structure is achieved. The high-strength steel wire cloth-polymer mortar reinforcing technology has higher requirements on the performance of matched polymer mortar, has better construction performance and higher compression strength and rupture strength, needs higher bonding strength with old concrete and stronger bond strength with high-strength steel wires, and has better freeze-thaw resistance and chloride ion permeation resistance of a high-strength steel wire polymer mortar reinforcing layer so as to improve the integral durability of a reinforced concrete member. However, in the prior art, the mortar for reinforcement, which takes ordinary portland cement as a cementing material, has a long maintenance period, large shrinkage and easy cracking, and is easy to cause low bonding strength between the new mortar and the old concrete interface; the reinforcing mortar using special cement as a main cementing material has the advantages of rapid development of early strength, easy occurrence of the problem of later strength shrinkage, less sources and higher cost; in the prior art, most of reinforcing and repairing mortar layers are free of steel wires and steel bars, and the freeze-thaw resistance and rust resistance are not considered, because the high-strength steel wire bundles are different from concrete in the mortar layers, the diameter of the steel wire bundles is small, the thickness of a protective layer is small, and the high-strength steel wires are seriously corroded under specific environmental factors such as a freeze-thaw environment and a chloride ion environment, 2011101630688 high-performance structural reinforcing mortar composition and a preparation process thereof, 201410239189X special reinforcing mortar for a wharf concrete structure in the prior art can improve the durability of the reinforcing mortar, but do not relate to performance indexes of the mortar and the high-strength steel wires. Due to the characteristics of thin high-strength steel wires and smooth surfaces, the high-strength steel wires lack chemical binding force, mechanical engaging force and friction force with mortar and can slide in the process of jointly stressing the high-strength steel wires and the mortar, so that the reinforced mortar has the problems of poor bonding force with the high-strength steel wires and poor comprehensive durability; therefore, a durable polymer mortar for reinforcing concrete members with high-strength steel wire cloth is urgently needed to be provided, and has higher cost performance.
Disclosure of Invention
The invention provides durable polymer mortar for a high-strength steel wire cloth reinforced concrete member, aiming at overcoming the defects of the existing reinforced mortar, and aims to solve the problems in the background technology.
The invention mainly adopts polymer rubber powder and a freezing-thawing-resistant rust-resisting compacting agent, can effectively improve the capillary micropore structure of the reinforced mortar, and improves the bonding strength of the polymer reinforced mortar and the concrete interface, the bond strength with the high-strength steel wire and the durability of the reinforcing layer and the original concrete structure under the synergistic action of the polymer rubber powder and the freezing-thawing-resistant rust-resisting compacting agent.
In order to achieve the purpose, the invention provides the following technical scheme:
the durable polymer mortar for the high-strength steel wire cloth reinforced concrete member is characterized in that: the traditional Chinese medicine is prepared from the following raw materials in parts by weight: 45-55 parts of cementing material, 38-45 parts of graded quartz sand, 3-5 parts of polymer rubber powder, 0.2-0.4 part of water reducing agent, 0.05-1 part of thixotropic agent, 0.05-0.2 part of retarder, 0.05-0.2 part of coagulant, 0.1-0.2 part of PP fiber and 3-5 parts of freeze-thaw resistant rust-resisting compacting agent.
The cementing material is prepared by mixing ordinary Portland cement and ultrahigh-strength sulphoaluminate cement in a mass ratio of: ultra-high strength sulphoaluminate cement 1: 0.1-0.2; wherein the grade strength of the ordinary Portland cement is 42.5 and 52.5, and the grade strength of the ultrahigh-strength sulphoaluminate cement is 62.5 to 92.5.
The graded quartz sand is formed by mixing quartz sand with the particle sizes of 10-20 meshes, 20-40 meshes, 40-70 meshes and 70-140 meshes, and the mass ratio of the quartz sand to the graded quartz sand is 2:3:3: 2.
The polymer rubber powder is chloroethylene-ethylene-lauric acid ethylene terpolymer waterproof rubber powder or acrylic acid waterproof rubber powder.
The water reducing agent is selected from polycarboxylate water reducing agent powder.
The thixotropic agent is a mixture of hydroxypropyl methyl cellulose with viscosity of 20000-60000 MPa-s and magnesium aluminum silicate, and the mass ratio of the hydroxypropyl methyl cellulose: magnesium aluminum silicate 1: 2-4.
The retarder is citric acid or tartaric acid or a mixture of the citric acid and the tartaric acid; the coagulant is lithium carbonate or lithium sulfate or a mixture of the lithium carbonate and the lithium sulfate; the PP fiber has the length of 3-6mm and the single-fine diameter of not more than 50 mu m.
The freeze-thaw resistance rust-resisting compacting agent is silicon micropowder or superfine silicon dioxide, YS chain silicate nano material, rust-resisting agent and nano air entraining agent, and the proportion is 0.4-0.5: 0.3-0.4: 0.1-0.2: 0.0005-0.001.
When the polymer mortar is used on site, the polymer mortar dry powder and water are mixed according to the mass ratio of 1: 0.12-0.14, mechanically stirring to obtain thick slurry, and combining with high-strength steel wire cloth to form a reinforced surface layer.
The main advantages of the invention are:
the invention has the advantages of simple preparation process, easy popularization and use and scientific and reasonable proportioning. The reinforced mortar which is compounded by ordinary portland cement and sulphoaluminate cement as main cementing materials has small shrinkage value and good later strength, and the cement-based mortar is modified by polymer glue powder and a freeze-thaw resistance rust-resisting compacting agent, and the modified reinforced mortar has the following advantages:
(1) the bonding strength of the repair mortar and the original concrete base layer is improved;
(2) the bond stress between the repair mortar and the high-strength steel wire is increased;
(3) the durability of the high-strength steel wire-polymer mortar reinforcing layer, such as water resistance, freeze thawing resistance, chloride ion permeation resistance and the like, is improved, the high-strength steel wire is prevented from being corroded by the mortar layer, and the integral durability of the reinforced concrete member is further improved.
Drawings
FIG. 1 is a photograph of a product of the present invention;
FIG. 2 is a photograph of the product of the present invention during construction;
FIG. 3 is a photograph of a floor slab reinforcement of the product of the present invention;
FIG. 4 is an SEM photograph of example 1 of the present invention;
FIG. 5 is an SEM photograph of comparative example 1 of the present invention;
FIG. 6 is an SEM photograph of comparative example 2 of the present invention.
FIG. 7 is an SEM photograph of comparative example 3 of the present invention;
FIG. 8 is an SEM photograph of comparative example 4 of the present invention;
Detailed Description
The raw materials referred to in the present application are all commercially available, and the type and source of the raw materials are shown in table 1.
TABLE 1 Specification, type and origin of the raw materials
The invention is further illustrated by the following examples.
Example 1
The durable polymer mortar for the high-strength steel wire cloth reinforced concrete member comprises 460kg of cementing materials (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 473.5kg of graded quartz sand (quartz sand with the grain sizes of 10 meshes, 25 meshes, 50 meshes and 80 meshes is mixed in a mass ratio of 2:3:3:2), 30kg of polymer rubber powder, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant, 1kg of PP fiber and 30kg of anti-permeability and anti-rust additive. Polymer mortar is prepared by premixing and mixing evenly, and when the polymer mortar is used, the mortar is as follows: water 1: 0.125, and mechanically stirring the mixture evenly to form thick slurry.
Example 2
The durable polymer mortar for the high-strength steel wire cloth reinforced concrete member comprises 540kg of cementing materials (450 kg of ordinary portland cement and 90kg of ultrahigh-strength sulphoaluminate cement), 393kg of graded quartz sand, 30kg of polymer rubber powder, 3.0kg of a water reducing agent, 0.5kg of a thixotropic agent, 1.5kg of a retarder, 1kg of a coagulant, 1kg of PP (polypropylene) fibers and 30kg of a freeze-thaw rust-resistant compacting agent. Polymer mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.140, and mechanically stirring the mixture uniformly to form thick slurry.
Example 2 is different from example 1 in that the cement of example 2 and the corresponding admixture and the amount of the quartz sand are different.
Example 3
460kg of cementing material (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 458.5kg of graded quartz sand, 45kg of polymer rubber powder, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant, 1kg of PP fiber and 30kg of anti-permeability and anti-rust compacting agent. Polymer mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: 1 in water: 0.120, and mechanically stirring the mixture evenly to form thick slurry.
Example 3 is different from example 1 in the amount of the polymer powder and the amount of the silica sand added in example 3.
Example 4
460kg of cementing material (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 458.5kg of graded quartz sand, 30kg of polymer rubber powder, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant, 1kg of PP fiber and 45kg of freeze-thaw resistance and rust resistance compacting agent. Polymer mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.135, and mechanically stirring the mixture evenly to form thick slurry.
Example 4 is different from example 1 in that the addition amount of the freeze-thaw resistance rust-resisting compacting agent and the quartz sand dosage of example 4 are different.
Comparative example 1:
460kg of ordinary portland cement, 536kg of graded quartz sand, 2.5kg of water reducing agent, 0.5kg of thixotropic agent and 1kg of PP fiber. The mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.130, and mechanically stirring the mixture evenly to form thick slurry.
Comparative example 1 differs from example 1 in that the cementitious material of comparative example 1 is ordinary portland cement, without retarders, accelerators, polymer glue powders, freeze-thaw resistance rust-inhibition compactants.
Comparative example 2:
460kg of cementing material (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 533.5kg of graded quartz sand, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant and 1kg of PP fiber. The mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.135, and mechanically stirring the mixture evenly to form thick slurry.
Comparative example 2 differs from example 1 in that comparative example 2 is free of polymer gum powder and freeze-thaw resistant rust inhibiting densifier.
Comparative example 3:
the durable polymer mortar for the high-strength steel wire cloth reinforced concrete member comprises 460kg of cementing materials (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 503.5kg of graded quartz sand, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant, 1kg of PP fiber and 30kg of freeze-thaw corrosion-resistant compacting agent. The mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.135, and mechanically stirring the mixture evenly to form thick slurry.
Comparative example 3 differs from example 1 in that comparative example 3 has no polymer gum powder.
Comparative example 4:
460kg of cementing material (400 kg of ordinary portland cement and 60kg of ultrahigh-strength sulphoaluminate cement), 503.5kg of graded quartz sand, 30kg of polymer rubber powder, 2.5kg of water reducing agent, 0.5kg of thixotropic agent, 1kg of retarder, 1.5kg of coagulant and 1 weight ratio of PP fiber. Polymer mortar is prepared by premixing and mixing evenly, and when in use, the mortar is as follows: water 1: 0.13, and mechanically stirring the mixture uniformly to form thick slurry.
Comparative example 4 differs from example 1 in that comparative example 4 is free of freeze-thaw resistance rust-blocking densifier.
Performance detection
The products of the above examples were subjected to experimental measurements:
and (3) flexural strength and compressive strength tests: manufacturing a test block by adopting a 40mm multiplied by 160mm test mold, and testing corresponding mechanical properties after standard maintenance for 28 d; meanwhile, a 2.5-5.0 mm test block is taken from the inside and stored in a sealed mode and used for microscopic analysis of an electron microscope.
The dry shrinkage rate is as follows: the 28d dry shrinkage was tested by reference to JC/T2381-2016 repair mortar.
The polymer reinforced mortar and concrete positive tensile bonding strength test: the method is carried out according to the method in appendix G of GB 50728-2011 safety appraisal technical Specification for engineering structural reinforcement materials.
The bond strength test of the high-strength steel wire cloth and the reinforced mortar comprises the following steps: (1) and (3) manufacturing a test piece: adopting a concrete test piece with the compression strength grade of C40-C45 and the size of 200mm multiplied by 100mm multiplied by 60mm, grinding and cleaning two surfaces of the concrete test piece, smearing interface glue, smearing a first layer of polymer mortar with the thickness of 5 +/-0.5 mm, wherein the distance between a mortar layer and one end part of the concrete test piece is 20 +/-1 mm, the length of the polymer mortar is 150 +/-1 mm, and the width of the polymer mortar is 60 +/-1 mm, paving high-strength steel wire cloth (the length of the high-strength steel wire cloth is 980 +/-2 mm, and the width of the high-strength steel wire cloth is 60 +/-1 mm), ensuring that the edge of the high-strength steel wire cloth is flush with the edge of the first layer of polymer mortar, smearing a second layer of polymer mortar (the thickness of 10 +/-0.5 mm), and preparing the other side of the concrete test piece according to the re-prepared after the polymer mortar is solidified; (2) and (3) test piece testing: and fixing the finished sample by a hanging end and a clamping end, maintaining for 28d under the maintenance condition specified in the technical Specification for safety evaluation of engineering structural reinforcing materials GB50728 in the current national standard, testing according to the specification of the part 1 of the metal material tensile test in the current national standard GB/T228.1, and recommending the loading speed to be 2mm/min and not more than 2 mm/min. The high-strength steel wire cloth for the test is 60mm wide and contains 9 high-strength steel wire bundles, and one steel wire bundle consists of 5 high-strength steel wires with the tensile strength of more than or equal to 3000MPa and the diameter of each steel wire of more than or equal to 0.36 mm. The test results include three forms of complete breaking, partial breaking and complete pulling out, and the bonding bond strength of the high-strength steel wire cloth and the reinforced mortar can be qualitatively judged.
The technical index of the water resistance is that after the steel standard block is soaked in tap water for 30 days, floating water is wiped off for testing, the positive tensile bonding strength of the steel standard block and a base material is tested at room temperature, and the testing method is carried out according to GB50728 appendix G.
The technical index of the damp-heat aging resistance is that the shear strength reduction rate of the steel wire rope and slurry bonding (steel sleeve method) is realized at room temperature after aging for 90 days in an environment with 50 ℃ and 98% RH; the test procedure is carried out as per appendix J of GB 50728.
The technical index of the freeze-thaw resistance is as follows
In a freeze-thaw alternating current environment, the steel wire rope and slurry are bonded at room temperature (a steel sleeve method) by 50 cycles (8 hours of each cycle); the test procedure was performed as per appendix R of GB 50728.
The chloride ion permeability resistance rating was evaluated according to ASTM C1202 direct current method.
The results are shown in Table 2.
Table 2 comparison table of performance test results of different reinforced mortars
From the experimental results and SEM image microscopic analysis of comparative examples 1 to 4 and comparative examples 1 to 4, it can be seen that:
compared with the embodiment 1 and the embodiment 2, the basic mechanical property of the mortar is still gradually increased along with the increase of the cement dosage, the influence on the durability is small, but the dry shrinkage rate is also increased, so that the later cracking risk is increased when the cement dosage is large, and the dosage of the cement in each ton of mortar is not excessive on the premise of meeting the comprehensive performance.
Compared with the embodiment 1 and the embodiment 3, with the increase of the mixing amount of the polymer rubber powder, the fracture strength, the compressive strength, the forward tensile bonding strength with concrete, the bond strength with high-strength steel wire cloth and other basic mechanical properties and the long-term durability of the mortar are all reduced, the main reason is that the cement hydration products form a compact structure due to the increase of the rubber powder consumption, but the gas content is gradually increased, and the compactness is reduced, so the performance of the mortar is improved due to the addition of a certain amount of the polymer rubber powder, but the compact structure of the hydration products is further reduced due to excessive rubber powder, and therefore, the polymer rubber powder has a proper mixing amount range.
Compared with the examples 1 and 4, the basic mechanical property and the long-term property are improved along with the increase of the mixing amount of the reinforcing compacting agent, which depends on the dual effects of good filling effect and high activity of the reinforcing compacting agent.
Comparing example 1 with comparative example 1, the cementing material of comparative example 1 is ordinary portland cement, no polymer rubber powder and freeze-thaw rust resistance compacting agent, the shrinkage value is large, the cracking is easy, the performances are poor, and the microstructure (shown in figure 5) of comparative example 1 also verifies that more microcracks exist;
comparing example 1 with comparative example 2, the cementing material of comparative example 2 is composite cement compounded by ordinary portland cement and ultrahigh-strength sulphoaluminate, and is also free of polymer rubber powder and freeze-thaw resisting and rust resisting compacting agent, besides the shrinkage ratio is much smaller than that of comparative example 1, the basic performance and long-term performance are also poorer, and as can be seen from the microstructure (shown in figure 6) of comparative example 2, due to the addition of the ultrahigh-strength sulphoaluminate cement, ettringite is generated on the surface of tricalcium silicate, but the whole structure is loose, and a small amount of structural defects still exist. Therefore, the invention determines a technical route for adopting the composite cement as the cementing material from the aspects of performance and cost.
Comparing example 1 with comparative example 3, comparative example 3 is doped with the freeze-thaw resistance rust-resisting compacting agent, no polymer rubber powder exists, the basic mechanical properties of the cement are poor except the breaking and compression strength, the long-term durability only partially approaches to meet the performance requirements, the microstructure (shown in figure 7) of comparative example 3 shows that the system generates more tricalcium silicate, needle column shaped crystals generate and block capillary pores, and the micro-nano scale reinforcing compacting agent is proved to improve the micropore structure and the compactness of the cement matrix system, so the freeze-thaw resistance rust-resisting compacting agent greatly contributes to the long-term durability.
Comparing example 1 with comparative example 4, comparative example 4 is doped with polymer rubber powder, has no freeze-thaw resistance and rust resistance compacting agent, has a large improvement range on the positive tensile bonding strength with concrete, but has a poorer long-term durability than comparative example 3, and as can be seen from the microstructure (shown in figure 8) of comparative example 4, the polymer rubber powder forms a crosslinking effect in a cement base, and a gel product is coated on a hydration product, so that the chemical bonding force is increased, and therefore, the polymer rubber powder has a large contribution to the improvement on the positive tensile bonding strength with concrete and the bonding force of high-strength steel wires; from the microstructure (shown in fig. 4) of the embodiment 1, it can be seen that under the synergistic effect of the reinforcing compacting agent and a proper amount of polymer rubber powder, the hydrated product is more uniform and compact, and the gel-like product is uniformly dispersed around the hydrated product, so that the hole structure in the mortar is obviously improved, the compactness of the mortar is improved, and the effective contact area and the chemical cementing power of the polymer mortar with the old concrete base surface and the high-strength steel wire are further increased, thereby improving the bonding strength of the special-purpose polymer mortar for reinforcing with the old concrete interface, the bonding force with the high-strength steel wire and the durability.
In summary, the comparative examples 1 to 4 prove that the composite cement is adopted as the cementing material, so that the quantity of ettringite formed by hydration can be adjusted, the pores are further filled, the shrinkage is compensated, and the cracking risk is reduced; the reinforced mortar without the reinforced compacting agent and the polymer rubber powder has poor performance, the performance of the singly-doped reinforced compacting agent and the polymer rubber powder is slightly improved, but part of indexes can not meet the requirements; the performances of the examples 1 to 4 in which the reinforcing compacting agent and the polymer rubber powder are mixed are all improved, and the basic mechanical properties and long-term performance indexes of the examples 1 and 4 in which a proper amount of the cementing material and the polymer rubber powder are mixed can meet the requirements.
Preferably, embodiment 1 has a high cost performance.
Claims (9)
1. The durable polymer mortar for the high-strength steel wire cloth reinforced concrete member is characterized in that: the traditional Chinese medicine is prepared from the following raw materials in parts by weight: 45-55 parts of cementing material, 38-45 parts of graded quartz sand, 3-5 parts of polymer rubber powder, 0.2-0.4 part of water reducing agent, 0.05-1 part of thixotropic agent, 0.05-0.2 part of retarder, 0.05-0.2 part of coagulant, 0.1-0.2 part of PP fiber and 3-5 parts of freeze-thaw resistant rust-resisting compacting agent.
2. The durable polymer mortar for high-strength steel wire cloth-reinforced concrete members according to claim 1, wherein: the cementing material is prepared by mixing ordinary Portland cement and ultrahigh-strength sulphoaluminate cement in a mass ratio of: ultra-high strength sulphoaluminate cement 1: 0.1-0.2; wherein the grade strength of the ordinary Portland cement is 42.5 and 52.5, and the grade strength of the ultrahigh-strength sulphoaluminate cement is 62.5 to 92.5.
3. The durable polymer mortar for high-strength steel wire cloth-reinforced concrete members according to claim 1, wherein: the graded quartz sand is formed by mixing quartz sand with the grain sizes of 10-20 meshes, 20-40 meshes, 40-70 meshes and 70-140 meshes, and the mass ratio of the quartz sand to the graded quartz sand is 2:3:3: 2.
4. The durable polymer mortar for high-strength steel wire cloth-reinforced concrete members according to claim 1, wherein: the polymer glue powder is tertiary carbonic acid ethylene-vinyl acetate-ethylene ternary waterproof glue powder or acrylic acid waterproof glue powder.
5. The durable polymer mortar for high-strength steel wire cloth reinforced concrete members according to claim 1, wherein: the water reducing agent is selected from polycarboxylate water reducing agent powder.
6. The durable polymer mortar for high-strength steel wire cloth reinforced concrete members according to claim 1, wherein: the thixotropic agent is a mixture of hydroxypropyl methyl cellulose with viscosity of 20000-60000 MPa-s and magnesium aluminum silicate, and the mass ratio of the hydroxypropyl methyl cellulose: magnesium aluminum silicate 1: 2-4.
7. The durable polymer mortar for high-strength steel wire cloth-reinforced concrete members according to claim 1, wherein: the retarder is citric acid or tartaric acid or a mixture of the citric acid and the tartaric acid; the coagulant is lithium carbonate or lithium sulfate or a mixture of the lithium carbonate and the lithium sulfate; the PP fiber has the length of 3-6mm and the single-fine diameter of not more than 50 mu m.
8. The durable polymer mortar for high-strength steel wire cloth-reinforced concrete members according to claim 1, wherein: the freeze-thaw resistance rust-resisting compacting agent is silicon micropowder or superfine silicon dioxide, YS chain silicate nano material, rust-resisting agent and nano air entraining agent, and the proportion is 0.4-0.5: 0.3-0.4: 0.1-0.2: 0.0005-0.001.
9. Use of a durable polymer mortar as claimed in claim 1 in high strength steel wire cloth reinforced concrete structures, wherein: when the polymer mortar is used on site, the polymer mortar dry powder and water are mixed according to the mass ratio of 1: 0.12-0.14, mechanically stirring to obtain thick slurry, and combining with high-strength steel wire cloth to form a reinforced surface layer.
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