CN115594476A - Cement-free high-performance concrete repair material and preparation method thereof - Google Patents
Cement-free high-performance concrete repair material and preparation method thereof Download PDFInfo
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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
- C04B28/14—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 calcium sulfate cements
- C04B28/142—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—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 calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/21—Mixtures thereof with other inorganic cementitious materials or other activators with calcium sulfate containing activators
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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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
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
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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
- C04B2111/72—Repairing or restoring existing buildings or building materials
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a cement-free high-performance concrete repairing material and a preparation method thereof, and relates to the technical field of concrete. The concrete repair material comprises the following raw materials: the low-carbon cementing material, the tailing sand, the water reducing agent, the polyvinyl alcohol fiber and the waste rubber powder can be further added with activated coal gangue and activated fly ash to further improve the performance. The invention uses various industrial solid waste components, so that the resources are recycled, the consumption of natural resources is reduced, cement components are not added, the emission of carbon dioxide and other gas pollutants caused by cement production is reduced, the energy-saving and carbon-reducing benefits are remarkable, and the prepared concrete repair material has excellent performance and good durability, has the advantage of simple preparation method, and has important popularization and application values in the field of concrete repair materials.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a cement-free high-performance concrete repairing material and a preparation method thereof.
Background
Currently, about half of the concrete repair materials are prematurely degraded, three-quarters of the causes of which are associated with insufficient durability of the concrete repair materials. Brittle cracking of concrete repair materials due to limited shrinkage is a major cause of their insufficient durability.
In an actual concrete repair work, the shrinkage deformation of the repair material is limited by the structure of the old concrete, resulting in tensile stress in the repair material and tensile and shear stress between the repair material/old concrete interface, which eventually manifests as cracking of the repair material and delamination of the interface, formation of cracks and falling off, resulting in poor durability.
In addition, the traditional concrete repairing material takes cement as a cementing material, and the cement belongs to the industries of high energy consumption, high consumption and high pollution emission. For each 1 ton of cement produced, 1.2 tons of natural resources (limestone and clay) and 100kg of standard coal are consumed, and 0.8 ton of CO is discharged as pollutant 2 And other sulfides, nitrogen oxides and particulate matters can not meet the development requirements of the current double-carbon era.
Therefore, it has been desired to provide a cement-free high performance concrete repair material having excellent properties.
Disclosure of Invention
The invention aims to provide a cement-free high-performance concrete repair material and a preparation method thereof, so that the problems of poor durability and high carbon emission of the traditional concrete repair material are solved.
In order to achieve the purpose, the invention provides the following scheme:
one of the technical schemes of the invention is as follows: the cement-free high-performance concrete repair material is prepared from the following raw materials in parts by mass:
1000-1200 parts of low-carbon cementing material, 300-400 parts of tailing sand, 320-340 parts of water, 8-10 parts of water reducing agent, 20-26 parts of polyvinyl alcohol fiber and 15-25 parts of waste rubber powder;
the low-carbon cementing material is a mixture of 55-16 mass ratios of slag, steel slag and desulfurized gypsum.
The second technical scheme of the invention is as follows: the preparation method of the cement-free high-performance concrete repair material comprises the following steps:
and uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed to obtain the cement-free high-performance concrete repairing material.
The third technical scheme of the invention is as follows: the cement-free high-performance concrete repair material is provided, and the raw materials comprise the following raw material components in parts by mass:
1000-1200 parts of low-carbon cementing material, 300-400 parts of tailing sand, 320-340 parts of water, 8-10 parts of water reducing agent, 20-26 parts of polyvinyl alcohol fiber and 15-25 parts of waste rubber powder;
the low-carbon cementing material is a mixture of slag, steel slag, desulfurized gypsum, activated coal gangue and activated fly ash in a mass ratio of 55-16.
Further, the activated coal gangue is prepared by the following steps:
and grinding the coal gangue, and performing microwave treatment to obtain the activated coal gangue.
Further, the coal gangue is mechanically ground to 80 μm with a sieve residue of 4.3%, the frequency of the microwave treatment is 1000-1500HZ, and the time is 4-5min.
Further, the preparation steps of the activated fly ash are as follows:
(1) Adding the fly ash into acid at 35 ℃ to be soaked for 5-10min, and filtering to obtain pretreated fly ash;
(2) Roasting the pretreated fly ash for 3-5min at 350-400 ℃, and then heating to 500-550 ℃ for roasting for 5-10min to obtain activated fly ash.
The acid used for pretreatment is hydrochloric acid or hydrochloric acid.
The fourth technical scheme of the invention is as follows: the preparation method of the cement-free high-performance concrete repair material comprises the following steps:
mixing and grinding the slag, the steel slag and the desulfurized gypsum, and adding the activated coal gangue and the activated fly ash for mixing after grinding to obtain the low-carbon cementing material;
and uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fiber, and mixing until the fiber is uniformly dispersed, thereby obtaining the cement-free high-performance concrete repairing material.
Further, the tailing sand is quartz rock type tailing sand, the mud content is less than 2%, the particle size distribution is that D90 is 300 micrometers, and D50 is 130 micrometers.
Further, the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent; the polyvinyl alcohol fiber has the diameter of 30-40 micrometers, the length of 6-10mm, the elastic modulus of more than 40GPa, the tensile strength of more than 1500MPa and the elongation of 6.0 percent.
Further, the waste rubber powder is prepared by grinding waste tire rubber, the average particle size is 80 microns, and the density is 1.1-1.2g/cm 3 。
Under the condition of limiting shrinkage, the cement-free high-performance concrete repair material disclosed by the invention enables the tensile stress generated in the material and the tensile stress and the shear stress generated at the interface of the repair material and the old concrete structure to be effectively dispersed in a mode of generating fine cracks, so that the phenomena of material cracking and interface layering are avoided.
The low elastic modulus of the repair material is also important for the durability of the concrete repair material, and the low elastic modulus can reduce the tensile stress caused by the limited shrinkage, thereby improving the cracking of the repair material and the delamination phenomenon of the interface between the repair material and the concrete.
The invention further adds the activated coal gangue and the activated fly ash into the low-carbon cementing material, the activated coal gangue and the activated fly ash belong to solid wastes, and are respectively treated by adopting a proper activation mode according to the characteristics of the activated coal gangue and the activated fly ash, so that the potential pozzolanic reaction activity of the activated coal gangue is fully activated, and the current situation that the effects of the conventional alkali activation mode, the thermal activation mode and the like are poor is improved.
According to the invention, through the matching of a proper activation mode, after the coal gangue and the fly ash are added, the performance of the repair material is further obviously improved, the durability is better, and the dual effects of solid waste utilization and repair material performance improvement are ensured.
The invention discloses the following technical effects:
the repair material has larger inelastic deformation, and the generated shrinkage deformation is released through fine cracks, so that the integrity of the material is ensured, the brittle fracture phenomenon commonly existing in the conventional concrete repair material is improved, and the durability is good.
The invention uses various industrial solid waste components, so that the resources are recycled, the consumption of natural resources is reduced, no cement component is added, the emission of carbon dioxide and other gas pollutants caused by cement production is reduced, and the energy-saving and carbon-reducing benefits are obvious.
The preparation method is simple, and the repairing material has excellent service performance under the condition of no cement addition, ensures the durability of the material, and has important popularization and application values in the field of concrete repairing materials.
Detailed Description
Reference will now be made in detail to various exemplary embodiments of the invention, the detailed description should not be construed as limiting the invention but rather as a more detailed description of certain aspects, features and embodiments of the invention.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Further, for numerical ranges in this disclosure, it is understood that each intervening value, between the upper and lower limit of that range, is also specifically disclosed. Every smaller range between any stated value or intervening value in a stated range and any other stated or intervening value in a stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included or excluded in the range.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference herein for the purpose of disclosing and describing the methods and/or materials associated with the documents. In case of conflict with any incorporated document, the present specification will control.
It will be apparent to those skilled in the art that various modifications and variations can be made in the specific embodiments of the present disclosure without departing from the scope or spirit of the disclosure. Other embodiments will be apparent to those skilled in the art from consideration of the specification. The description and examples are intended to be illustrative only.
As used herein, the terms "comprising," "including," "having," "containing," and the like are open-ended terms that mean including but not limited to.
The "parts" in the present invention are all parts by mass unless otherwise specified.
The raw materials used in the embodiment of the invention are as follows:
the tailing sand is quartz rock type tailing sand, the mud content is less than 2%, the particle size distribution is that D90 is 300 microns, and D50 is 130 microns; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent; the polyvinyl alcohol fiber has the diameter of 30-40 microns, the length of 6-10mm, the elastic modulus of more than 40GPa, the tensile strength of more than 1500MPa and the elongation of 6.0 percent; the fly ash is two-stage fly ash and SiO 2 And Al 2 O 3 The total mass fraction is more than or equal to 70 percent; the coal gangue is unburned coal gangue and SiO 2 And Al 2 O 3 The total mass fraction is more than or equal to 72 percent.
Wherein the 3-day compressive strength of the low-carbon cementing material is more than or equal to 20.0MPa, and the 28-day compressive strength is more than or equal to 45MPa; the density is more than or equal to 2.6g/cm 3 (ii) a The fineness (the screen residue of a 45 mu m square hole sieve) is less than or equal to 2.0 percent (mass percentage); the water consumption of the standard consistency is less than or equal to 28.5 percent; the initial setting time is more than or equal to 60min, and the final setting time is less than or equal to 600min; the stability (boiling method and autoclaving method) is qualified; the content of chloride ions is less than or equal to 0.06 percent (mass percentage).
Example 1
The cement-free high-performance concrete repair material comprises the following raw materials in parts by mass:
1000 parts of low-carbon cementing material, 400 parts of tailing sand, 320 parts of water, 8 parts of water reducing agent, 26 parts of polyvinyl alcohol fiber and 15 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing and grinding slag, steel slag and desulfurized gypsum according to a mass ratio of 55; the waste rubber powder is prepared by grinding waste tire rubber, and has an average particle size of 80 microns and a density of 1.2g/cm 3 。
The preparation method of the cement-free high-performance concrete repair material comprises the following steps:
uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed, thereby obtaining the cement-free high-performance concrete repair material.
Example 2
1200 parts of low-carbon cementing material, 300 parts of tailing sand, 340 parts of water, 10 parts of water reducing agent, 24 parts of polyvinyl alcohol fiber and 25 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing and grinding slag, steel slag and desulfurized gypsum according to a mass ratio of 60; the waste rubber powder is prepared by grinding waste tire rubber, and has an average particle size of 80 μm and a density of 1.1g/cm 3 。
The preparation method of the cement-free high-performance concrete repair material comprises the following steps:
uniformly mixing a low-carbon cementing material, tailing sand, water, a water reducing agent and waste rubber powder in proportion, then adding polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed to obtain the cement-free high-performance concrete repair material.
Example 3
1500 parts of low-carbon cementing material, 350 parts of tailing sand, 330 parts of water, 9 parts of water reducing agent, 20 parts of polyvinyl alcohol fiber and 20 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing and grinding slag, steel slag and desulfurized gypsum according to a mass ratio of 65; waste rubberThe rubber powder is prepared by grinding waste tire rubber, has an average particle size of 80 micrometers and a density of 1.2g/cm 3 。
The preparation method of the cement-free high-performance concrete repair material comprises the following steps:
uniformly mixing a low-carbon cementing material, tailing sand, water, a water reducing agent and waste rubber powder in proportion, then adding polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed to obtain the cement-free high-performance concrete repair material.
Example 4
The cement-free high-performance concrete repair material comprises the following raw materials in parts by mass:
1000 parts of low-carbon cementing material, 400 parts of tailing sand, 320 parts of water, 8 parts of water reducing agent, 26 parts of polyvinyl alcohol fiber and 15 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing slag, steel slag, desulfurized gypsum, activated coal gangue and activated coal ash according to the mass ratio of (55); the waste rubber powder is prepared by grinding waste tire rubber, and has an average particle size of 80 μm and a density of 1.2g/cm 3 。
The activated coal gangue is prepared by the following steps:
mechanically grinding coal gangue to 80 μm with a sieve residue of 4.3%, and performing microwave treatment at 1000-1500HZ for 5min;
the activated fly ash is prepared by the following steps:
(1) Adding the fly ash into hydrochloric acid with the temperature of 35 ℃ for soaking for 8min, and filtering to obtain pretreated fly ash;
(2) Roasting the pretreated fly ash at 380 ℃ for 4min, then heating to 530 ℃ and roasting for 8min to obtain activated fly ash;
the preparation method of the cement-free high-performance concrete repair material comprises the following steps:
mixing and grinding the slag, the steel slag and the desulfurized gypsum, and adding activated coal gangue and activated fly ash for mixing after grinding to obtain a low-carbon cementing material;
uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed, thereby obtaining the cement-free high-performance concrete repair material.
Example 5
The cement-free high-performance concrete repair material comprises the following raw materials in parts by mass:
1200 parts of low-carbon cementing material, 300 parts of tailing sand, 340 parts of water, 10 parts of water reducing agent, 24 parts of polyvinyl alcohol fiber and 25 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing slag, steel slag, desulfurized gypsum, activated coal gangue and activated fly ash according to the mass ratio of 60; the waste rubber powder is prepared by grinding waste tire rubber, and has an average particle size of 80 μm and a density of 1.1g/cm 3 。
The activated coal gangue is prepared by the following steps:
mechanically grinding coal gangue to 80 μm with a sieve residue of 4.3%, and performing microwave treatment at 1000-1500HZ for 4-5min;
the activated fly ash is prepared by the following steps:
(1) Adding the fly ash into hydrochloric acid with the temperature of 35 ℃ for soaking for 5min, and filtering to obtain pretreated fly ash;
(2) Roasting the pretreated fly ash at 400 ℃ for 5min, and then heating to 500 ℃ for roasting for 5min to obtain activated fly ash;
the preparation method of the cement-free high-performance concrete repair material comprises the following steps:
mixing and grinding the slag, the steel slag and the desulfurized gypsum, and adding activated coal gangue and activated fly ash for mixing after grinding to obtain a low-carbon cementing material;
uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed, thereby obtaining the cement-free high-performance concrete repair material.
Example 6
The cement-free high-performance concrete repair material comprises the following raw materials in parts by mass:
1500 parts of low-carbon cementing material, 350 parts of tailing sand, 330 parts of water, 9 parts of water reducing agent, 20 parts of polyvinyl alcohol fiber and 20 parts of waste rubber powder;
the low-carbon cementing material is prepared by mixing slag, steel slag, desulfurized gypsum, activated coal gangue and activated fly ash according to the mass ratio of 65; the waste rubber powder is prepared by grinding waste tire rubber, and has an average particle size of 80 μm and a density of 1.1g/cm 3 。
The activated coal gangue is prepared by the following steps:
mechanically grinding the coal gangue to 80 mu m of screen residue of 4.3 percent, and then carrying out microwave treatment for 4min at 1200 HZ;
the activated fly ash is prepared by the following steps:
(1) Adding the fly ash into sulfuric acid with the temperature of 35 ℃ for soaking for 8min, and filtering to obtain pretreated fly ash;
(2) Roasting the pretreated fly ash at 360 ℃ for 4min, then heating to 550 ℃ and roasting for 10min to obtain activated fly ash;
the preparation method of the cement-free high-performance concrete repair material comprises the following steps:
mixing and grinding the slag, the steel slag and the desulfurized gypsum, and adding activated coal gangue and activated fly ash for mixing after grinding to obtain a low-carbon cementing material;
uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed, thereby obtaining the cement-free high-performance concrete repair material.
Comparative example 1
The difference from the example 4 is that the coal gangue is not subjected to microwave activation treatment, but only subjected to mechanical activation.
Comparative example 2
The difference from example 4 is that the two-step roasting is not adopted when the fly ash is activated, and the roasting is directly carried out for 12min at 530 ℃.
Comparative example 3
The difference from the example 4 is that the addition amount of the activated coal ash is adjusted, so that the mass ratio of the slag, the steel slag, the desulfurized gypsum, the activated coal gangue to the activated coal ash is (55).
The performance data of the concrete repair material prepared by the invention are as follows:
TABLE 1
| 28 day compressive strength (MPa) | Tensile ductility (%) | Modulus of elasticity (GPa) | |
| Example 1 | 25 | 2.2 | 10 |
| Example 2 | 27 | 2.5 | 7 |
| Example 3 | 35 | 2.3 | 11 |
| Example 4 | 39 | 2.5 | 11 |
| Example 5 | 42 | 2.5 | 9 |
| Example 6 | 45 | 2.3 | 10 |
| Comparative example 1 | 31 | 2.2 | 9 |
| Comparative example 2 | 29 | 2.3 | 8 |
| Comparative example 3 | 27 | 2.2 | 9 |
It can be seen from the above examples that when the amount of the gel material added is small and the amount of the sand added is large, the strength of the material is reduced and the tensile ductility is also low; the rubber powder is added in a high amount, the higher the tensile ductility is, and the lower the elastic modulus and strength are; the less fiber, the lower the tensile ductility.
Meanwhile, it can be seen that when the treatment mode of the coal gangue and the fly ash is changed or the ratio of the coal gangue to the fly ash exceeds the proportion range of the invention, the performance of the anhydrous concrete repair material is reduced, so that the later repair effect cannot be achieved.
The crack resistance coefficient R can reflect the influence of the elastic modulus on the crack resistance of the repair material under the condition of limiting shrinkage:
R＝σ cr /σ sh
in the formula sigma cr -initial crack strength;
ε sh -a shrinkage strain;
e-modulus of elasticity; sigma sh -shrinkage stress, σ sh ＝E﹒ε sh .。
The greater the crack resistance coefficient R, the less likely the material will crack under the constrained shrinkage.
The numerical value of the crack resistance coefficient R of the concrete repair material prepared by the invention is shown in Table 2.
TABLE 2
The cracking behavior of the material under the condition of limited shrinkage is researched by adopting a circular ring limited shrinkage characterization method, and the limited shrinkage test device consists of an inner ring, an outer ring and a bottom plate: the inner ring is a hard steel ring, so that a test piece can be completely constrained by the steel ring when contracting, the outer ring is a waterproof plastic ring, and the bottom plate is a polyethylene resin plate. The freshly mixed concrete repair materials of examples 1 and 4 were poured between the two rings, and after forming, a plastic film was applied to prevent moisture evaporation, and after curing for 24 hours, the outer ring mold was removed, and a layer of epoxy resin was applied to the upper surface of the test piece to prevent moisture evaporation from the surface of the test piece. Then placing the mixture in an environment with the temperature of 23 +/-3 ℃ and the relative humidity of 25 +/-5% for curing. And observing the generation and development conditions of the cracks on the surface of the test piece by using a microscope, and recording the change conditions of the crack formation time, the crack number, the crack length and the crack width along with the maintenance age. The cracking behavior data of the concrete repair materials under ring-limited shrinkage are shown in Table 3.
TABLE 3
The initial cracking time of the concrete material prepared by the invention under the condition of limited shrinkage is longer, the number of cracks is less, the cracking tendency of the concrete material under the condition of limited shrinkage is effectively reduced, and the durability of the concrete repairing material is ensured.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (10)
1. The cement-free high-performance concrete repair material is characterized by comprising the following raw material components in parts by mass:
1000-1200 parts of low-carbon cementing material, 300-400 parts of tailing sand, 320-340 parts of water, 8-10 parts of water reducing agent, 20-26 parts of polyvinyl alcohol fiber and 15-25 parts of waste rubber powder;
the low-carbon cementing material is a mixture of 55-16 mass ratios of slag, steel slag and desulfurized gypsum.
2. The method for preparing the cement-free high performance concrete repair material according to claim 1, comprising the steps of:
and uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed to obtain the cement-free high-performance concrete repairing material.
3. The cement-free high-performance concrete repair material is characterized by comprising the following raw material components in parts by mass:
1000-1200 parts of low-carbon cementing material, 300-400 parts of tailing sand, 320-340 parts of water, 8-10 parts of water reducing agent, 20-26 parts of polyvinyl alcohol fiber and 15-25 parts of waste rubber powder;
the low-carbon cementing material is a mixture of slag, steel slag, desulfurized gypsum, activated coal gangue and activated fly ash in a mass ratio of 55-16.
4. The cement-free high performance concrete repair material of claim 3, wherein the activated coal gangue is prepared by the following steps:
and grinding the coal gangue, and performing microwave treatment to obtain the activated coal gangue.
5. The cement-free high-performance concrete repair material according to claim 4, wherein the coal gangue is mechanically ground to a 80 μm screen residue of 4.3%, the frequency of the microwave treatment is 1000 to 1500Hz, and the time is 4 to 5min.
6. The cement-free high-performance concrete repair material according to claim 3, wherein the activated fly ash is prepared by the following steps:
(1) Adding the fly ash into acid at 35 ℃ to be soaked for 5-10min, and filtering to obtain pretreated fly ash;
(2) And roasting the pretreated fly ash at 350-400 ℃ for 3-5min, and then heating to 500-550 ℃ to roast for 5-10min to obtain the activated fly ash.
7. The method for preparing the cement-free high performance concrete repair material according to any one of claims 3 to 6, comprising the steps of:
mixing and grinding the slag, the steel slag and the desulfurized gypsum, and adding the activated coal gangue and the activated fly ash for mixing after grinding to obtain the low-carbon cementing material;
and uniformly mixing the low-carbon cementing material, the tailing sand, the water reducing agent and the waste rubber powder in proportion, then adding the polyvinyl alcohol fibers, and mixing until the fibers are uniformly dispersed to obtain the cement-free high-performance concrete repairing material.
8. The cement-free high-performance concrete repair material according to claim 1 or 3, wherein the tailings are quartz-type tailings, the content of the sludge is less than 2%, and the particle size distribution is: d90 was 300 microns and D50 was 130 microns.
9. The cement-free high-performance concrete repair material according to claim 1 or 3, wherein the water reducing agent is a polycarboxylic acid high efficiency water reducing agent; the polyvinyl alcohol fiber has the diameter of 30-40 micrometers, the length of 6-10mm, the elastic modulus of more than 40GPa, the tensile strength of more than 1500MPa and the elongation of 6.0 percent.
10. The cement-free high-performance concrete repair material according to claim 1 or 3, wherein the waste rubber powder has an average particle diameter of 80 μm and a density of 1.1 to 1.2g/cm 3 。
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