CN106746836B - High-adhesion corrosion-resistant concrete interface treating agent and application thereof - Google Patents
High-adhesion corrosion-resistant concrete interface treating agent and application thereof Download PDFInfo
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- CN106746836B CN106746836B CN201710014792.1A CN201710014792A CN106746836B CN 106746836 B CN106746836 B CN 106746836B CN 201710014792 A CN201710014792 A CN 201710014792A CN 106746836 B CN106746836 B CN 106746836B
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5007—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing
- C04B41/5014—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with salts or salty compositions, e.g. for salt glazing containing sulfur in the anion, e.g. sulfides
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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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/60—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only artificial stone
- C04B41/61—Coating or impregnation
- C04B41/65—Coating or impregnation with inorganic materials
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-adhesion corrosion-resistant concrete interface treating agent and application thereof, wherein the treating agent is prepared from the following raw materials in parts by weight: 0.02-0.1 part of fiber, 60-93 parts of particle ultrafine active mineral admixture, 5-30 parts of chemical admixture and 2-10 parts of nano-grade active exciting agent. The interface treating agent disclosed by the invention not only has super-strong binding power and can be used for remarkably enhancing the binding power at the interface of the new and old concrete, but also is capable of remarkably improving the corrosion resistance of the new and old concrete after being bound, effectively reducing the potential safety hazard of disease engineering, improving the safety degree of a concrete structure, ensuring the structural integrity, prolonging the service life of the engineering, saving the engineering maintenance cost and having better economic benefit, social benefit and ecological benefit.
Description
Technical Field
The invention belongs to the technical field of building materials, and relates to a concrete interface treating agent, in particular to a high-adhesion corrosion-resistant concrete interface treating agent and application thereof.
Background
The concrete structure in coastal areas is influenced by external factors such as sea salt erosion, steel bar corrosion, water wave impact, freeze thawing damage and the like, coastal hydraulic buildings (tidal gates, bridge gates, aqueducts and sea walls) mostly run for 30-40 years, and some service lives are even shorter, so that the design and use functions are basically lost, and the coastal concrete structure needs to be reinforced. The concrete interface treating agent is a transition layer for bonding new and old concrete, can effectively improve the bonding microstructure of the new and old concrete, improve the bonding strength and ensure the integrity of the new and old concrete, so the concrete interface treating agent is widely applied to concrete engineering repair, reinforcement and the like.
The common concrete interface treating agents at home and abroad comprise an inorganic interface agent, an organic interface agent and an organic modified interface agent: (1) the inorganic interface agent is mainly cement paste or inorganic (fly ash, silica fume, slag and the like) modified cement paste; (2) organic interface agents mainly comprise epoxy resin, epoxy daub, polymer and the like; (3) the organic modified interface agent is an interface agent which is modified by adding an organic polymer on the basis of an inorganic interface agent. Although the method improves the bonding strength of the new and old concrete to different degrees, the method has the following defects: the inorganic interface agent has large early shrinkage, low early strength and poor durability; the organic interface agent has complex operation, large environmental influence, high price and high popularization and application cost; the organic modified interface agent singly improves the bonding property, neglects the bonding durability of the interface agent, and is not suitable for repairing the concrete structure in the coastal corrosive environment. Therefore, the development of a concrete interface treating agent with excellent adhesive property and high corrosion resistance has practical significance and value.
Disclosure of Invention
Aiming at the defects of the existing concrete interface treating agent, the invention aims to develop a high-bonding corrosion-resistant concrete interface treating agent and application thereof, wherein the interface treating agent not only has super-strong bonding force and can obviously enhance the bonding force at the interface of new and old concrete, but also obviously improves the corrosion resistance after the new and old concrete is bonded, can effectively reduce the potential safety hazard of disease engineering, improve the safety degree of a concrete structure, ensure the structural integrity, prolong the service life of the engineering, save the engineering maintenance cost and have more obvious direct and indirect economic benefits.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 0.02-0.1 part of fiber, 60-93 parts of active mineral admixture, 5-30 parts of chemical admixture and 2-10 parts of active excitant;
preferably, the fiber comprises more than one of polypropylene fiber, polyacrylonitrile fiber, polyethylene fiber and carbon fiber;
preferably, the chemical admixture comprises a mixture of more than one of an expanding agent, a shrinkage reducing agent and a water reducing agent;
preferably, the active mineral admixture comprises a particle ultrafine mixture of more than two of fly ash, metakaolin, slag, silica fume and red mud;
preferably, the activator comprises more than one of nano sodium silicate, nano sodium sulfate and nano caustic soda;
preferably, the expanding agent comprises more than one of calcium sulphoaluminate expanding agent, calcium oxide expanding agent and magnesium oxide expanding agent;
preferably, the shrinkage reducing agent comprises one or more of polypropylene glycol, ethylene oxide methanol addenda and methyl ether-based polymers;
preferably, the water reducing agent comprises one or more of a modified alkali lignosulfonate water reducing agent, a naphthalene sulfonate water reducing agent, an aromatic sulfamate polymer and a polyacrylate.
The application method of the high-adhesion corrosion-resistant concrete interface treating agent comprises the following steps:
(1) surface treatment of old concrete: roughening the surface of the base layer old concrete, controlling the roughness of a bonding surface to be 3-5mm, and brushing the roughened old concrete bonding surface twice by using a brush to wet the surface of the base layer old concrete;
(2) slurry preparation and construction: preparing materials according to the weight ratio of interface treating agent cement to water =1: 0.9-1:7, mixing the interface treating agent and the cement, adding water to prepare cement paste or adding water and sand to prepare cement mortar, coating the interface treating agent cement paste or the cement mortar on the surface of the old concrete subjected to surface treatment, wherein the coating thickness of the interface treating agent cement paste or the cement mortar is 1.5-3 mm;
(3) and immediately pouring new concrete after brushing the interface agent cement paste or cement mortar.
Compared with the prior art, the invention has the advantages and beneficial effects that:
1. the superfine mineral admixture can improve the performance of an interfacial agent mixture, improve the uniformity of an interfacial agent and reduce the construction difficulty of the interfacial agent mixture.
2. The active mineral admixture of the invention reacts with calcium hydroxide and ettringite in cement hydration products to generate hydrated calcium silicate, so that the bonding area of the new and old concrete is more compact, thereby improving the bonding strength and the corrosion resistance of the new and old concrete; on the other hand, the active mineral admixture can also play a role in curing and invading chloride ions, and further improve the bonding corrosion resistance of the new and old concrete.
3. The nanometer sodium silicate, nanometer sodium sulfate and nanometer caustic soda activator has the main characteristics of finer particles and higher surface activity, can further improve the compactness of a bonding interface of new and old concrete, and can also activate the early activity of cement and mineral admixtures and improve the early bonding strength of the new and old concrete.
4. The invention selects the expanding agent to compensate the shrinkage by generating expanded crystals such as ettringite, calcium hydroxide and the like, and the shrinkage reducing agent reduces the shrinkage by reducing the surface tension of water, thereby reducing the generation of shrinkage cracks at the interface bonding part of the new and old concrete and improving the bonding effect of the new and old concrete.
5. The synthetic fiber selected by the invention can further reduce the shrinkage of the interface between the new concrete and the old concrete, reduce the shrinkage difference with the old concrete and improve the integrity of the new concrete and the old concrete after bonding.
6. The interface treating agent disclosed by the invention not only has super-strong binding power and can be used for remarkably enhancing the binding power at the interface of the new and old concrete, but also is capable of remarkably improving the corrosion resistance of the new and old concrete after being bound, effectively reducing the potential safety hazard of disease engineering, improving the safety degree of a concrete structure, ensuring the structural integrity, prolonging the service life of the engineering, saving the engineering maintenance cost and having better economic benefit, social benefit and ecological benefit.
Detailed Description
The present invention will be further described with reference to the following specific examples, but is not limited to the scope of the present invention.
Interpretation of terms: 1. no interface agent: before repairing old concrete, only brushing water on the bonding surface of the old concrete to wet, and directly pouring new concrete without brushing an interface agent; 2. cement paste interface agent: the interface agent only comprises cement paste consisting of water and cement; 3. cement expansion paste interface agent: adding a cement paste interface agent of an expanding agent; 4. old concrete: the concrete to be repaired; 5. and (3) new concrete: and (5) repairing the concrete.
The strength grade of the used old concrete is C20, the formed standard cube test block is obtained by standard curing for 28d and splitting after natural curing for 5 months, and the roughness of the bonding surface is 3-5 mm; the new concrete strength grade is C25; roughening the old concrete to remove loose concrete on the bonding surface, and then brushing the roughened old concrete bonding surface with a brush to wet the surface; brushing a layer of 1.5-3mm interface treating agent cement paste or cement mortar, laterally pouring new concrete for repairing, maintaining for 28d, measuring the splitting tensile strength of the bonded new and old concrete to reflect the bonding strength of the new and old concrete, and measuring the chloride ion permeation resistance of the bonded new and old concrete to reflect the bonding corrosion resistance of the new and old concrete.
Example 1
A high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 80.88% of particle ultra-fine mineral admixture (containing 60% of fly ash and 40% of silica fume), 0.02% of fiber (polypropylene fiber), 16.1% of chemical admixture (containing 3.6% of polycarboxylic acid water reducing agent and 96.4% of calcium sulphoaluminate expanding agent), and 3% of excitant (containing 70% of nano sodium silicate and 30% of nano sodium sulfate). The preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treatment cement paste is prepared by preparing high-adhesion corrosion-resistant concrete interface treatment agent, cement and water in a ratio of =1:2:1.2 and mixing.
Example 2
A high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 75.88% of particle ultra-fine mineral admixture (containing 60% of fly ash and 40% of slag), 0.02% of fiber (polypropylene fiber), 16.1% of chemical admixture (containing 3.6% of polycarboxylic acid water reducing agent and 96.4% of calcium sulphoaluminate expanding agent), and 3% of exciting agent (containing 70% of nano sodium silicate and 30% of nano sodium sulfate). The preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treatment cement paste is prepared by preparing high-adhesion corrosion-resistant concrete interface treatment agent, cement and water in a ratio of =1:2:1.2 and mixing.
Example 3
A high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 75.88% of particle ultra-fine mineral admixture (containing 60% of fly ash and 40% of metakaolin), 0.02% of fiber (polypropylene fiber), 16.1% of chemical admixture (containing 3.6% of polycarboxylic acid water reducing agent and 96.4% of calcium sulphoaluminate expanding agent), and 8% of excitant (containing 70% of nano sodium silicate, 20% of nano sodium sulfate and 10% of nano caustic soda). The preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treatment cement paste is prepared by preparing high-adhesion corrosion-resistant concrete interface treatment agent, cement and water in a ratio of =1:2:1.2 and mixing.
Example 4
A high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 75.8 percent of particle ultra-fine mineral admixture (containing 60 percent of fly ash, 20 percent of silica fume and 20 percent of slag), 0.1 percent of fiber (polypropylene fiber), 16.1 percent of chemical admixture (containing 3.6 percent of polycarboxylic acid water reducing agent and 96.4 percent of calcium sulphoaluminate expanding agent), and 8 percent of excitant (containing 70 percent of nano sodium silicate, 20 percent of nano sodium sulfate and 10 percent of nano caustic soda). The preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treatment cement paste is prepared by preparing high-adhesion corrosion-resistant concrete interface treatment agent, cement and water in a ratio of =1:2:1.2 and mixing.
Example 5
A high-adhesion corrosion-resistant concrete interface treating agent is prepared from the following raw materials in parts by weight: 75.8 percent of particle ultra-fine mineral admixture (containing 55 percent of fly ash, 15 percent of silica fume, 15 percent of slag and 15 percent of metakaolin), 0.1 percent of fiber (polypropylene fiber), 16.1 percent of chemical admixture (containing 3.6 percent of polycarboxylic acid water reducing agent and 96.4 percent of calcium sulphoaluminate expanding agent), and 8 percent of excitant (containing 70 percent of nano sodium silicate, 20 percent of nano sodium sulfate and 10 percent of nano caustic soda). The preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treating agent is prepared by preparing materials according to the proportion of cement to water =1:2:1.2, mixing the materials to prepare the high-adhesion corrosion-resistant concrete interface, and mixing the materials to prepare cement paste.
Comparative example 1
No interface agent: before pouring new concrete, the new concrete is directly poured after the bonding surface of the old concrete is wetted by the brush.
Comparative example 2
Cement paste interface agent: before pouring new concrete, wetting the bonding surface of old concrete by using a brush to soak water, then coating a cement paste interface treating agent, and pouring the new concrete, wherein the formula of the cement paste interface agent is as follows: cement =0.4: 1.
Comparative example 3
Before pouring new concrete, wetting the bonding surface of old concrete by using a brush to soak water, and then coating a cement expansion slurry interface treating agent, wherein the formula of the cement expansion slurry interface agent is as follows: water, cement, calcium sulfoaluminate expanding agent =0.4:0.95: 0.05.
Comparative example 4
Integral new concrete: the comparison is with whole new concrete test block.
The application effects of the anti-cracking and anti-corrosion concrete admixture of each example are shown in the following table.
Action effect comparison table of high-adhesion corrosion-resistant concrete interface treating agent
The test result shows that the high-bonding corrosion-resistant concrete interface treating agent produced by the invention is used for bonding new and old concrete, the 28d bonding strength can reach more than 85% of the whole new concrete, and is improved by more than 65% compared with the non-coated interface agent and is improved by more than 25% compared with the common interface agent; the 6h electric flux of the 28d test piece is reduced by more than 20% compared with that of the test piece without the interface agent, is slightly higher than that of the whole new concrete test piece, and has the advantages of high bonding, corrosion resistance and the like.
Claims (2)
1. The application of the high-adhesion corrosion-resistant concrete interface treating agent is characterized by comprising the following raw materials in parts by weight: 0.02-0.1 part of fiber, 60-93 parts of active mineral admixture, 5-30 parts of chemical admixture and 2-10 parts of active excitant;
the fiber is more than one of polypropylene fiber, polyethylene fiber and carbon fiber;
the active mineral admixture is a particle superfine mixture of more than two of fly ash, metakaolin, slag and silica fume;
the excitant is a mixture of more than two of nano sodium silicate, nano sodium sulfate and nano caustic soda;
the chemical admixture is a polycarboxylic acid water reducing agent and a calcium sulphoaluminate expanding agent;
the application method comprises the following steps:
(1) surface treatment of old concrete: carrying out rough treatment on the surface of the old concrete of the base layer, controlling the roughness of the bonding surface of the old concrete to be 3-5mm, and using a brush to dip water and brush the rough bonding surface of the old concrete twice to wet the surface of the old concrete;
(2) preparing the interface treating agent, namely preparing materials according to the weight ratio of cement to water =1: 0.9-1:7, mixing the interface treating agent and the cement, adding water to prepare cement paste or adding water and sand to prepare cement mortar, coating the interface treating agent cement paste or the cement mortar on the surface of the old concrete subjected to surface treatment, wherein the coating thickness of the interface treating agent cement paste or the cement mortar is 1.5-3 mm;
(3) and immediately pouring new concrete after brushing the interface agent cement paste or cement mortar.
2. A preparation method of a high-adhesion corrosion-resistant concrete interface treating agent is characterized by comprising the following steps: the feed is prepared from the following raw materials in parts by weight: 75.8 percent of particle superfine mineral admixture containing 55 percent of fly ash, 15 percent of silica fume, 15 percent of slag and 15 percent of metakaolin, 0.1 percent of polypropylene fiber, 16.1 percent of chemical admixture containing 3.6 percent of polycarboxylic acid water reducing agent and 96.4 percent of calcium sulphoaluminate expanding agent, and 8 percent of excitant containing 70 percent of nano sodium silicate, 20 percent of nano sodium sulfate and 10 percent of nano caustic soda;
the preparation method comprises the following steps: the high-adhesion corrosion-resistant concrete interface treating agent is prepared by preparing materials according to the proportion of the high-adhesion corrosion-resistant concrete interface treating agent to cement to water =1:2:1.2, and mixing the materials to prepare the high-adhesion corrosion-resistant concrete interface treating agent and the high-adhesion corrosion-resistant concrete interface treating agent to be mixed to prepare cement paste.
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| CN108865028A (en) * | 2018-05-25 | 2018-11-23 | 邹峰 | A kind of preparation method of low temperature resistant expediting setting type dry-hang glue |
| CN108914980A (en) * | 2018-07-23 | 2018-11-30 | 昆明理工大学 | A kind of processing method of ECC- concrete interface |
| CN111285631B (en) * | 2019-11-21 | 2022-03-15 | 江苏苏博特新材料股份有限公司 | Interfacial agent, preparation method thereof and application thereof in fabricated building structure |
| CN111635169A (en) * | 2020-05-12 | 2020-09-08 | 江苏宇航建材科技有限公司 | Corrosion-resistant concrete interface treating agent and application thereof |
| CN111732366A (en) * | 2020-07-07 | 2020-10-02 | 四川恒泽建材有限公司 | Concrete interface treating agent and preparation method thereof |
| CN113968697B (en) * | 2021-10-27 | 2023-06-30 | 临海市忠信新型建材有限公司 | Dry powder interface treating agent for aerated concrete and preparation method thereof |
| CN114292584A (en) * | 2022-01-06 | 2022-04-08 | 黄鑫 | Water-based nano sand consolidation agent |
| CN115572131A (en) * | 2022-10-17 | 2023-01-06 | 大连海事大学 | Nano metakaolin modified cement mortar interface agent and preparation method and application thereof |
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