CN112479669A - Concrete damage repairing cement-based material for prefabricated part and application thereof - Google Patents
Concrete damage repairing cement-based material for prefabricated part and application thereof Download PDFInfo
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- CN112479669A CN112479669A CN202011526242.6A CN202011526242A CN112479669A CN 112479669 A CN112479669 A CN 112479669A CN 202011526242 A CN202011526242 A CN 202011526242A CN 112479669 A CN112479669 A CN 112479669A
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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
- C04B28/141—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 dihydrated gypsum before the final hardening step, e.g. forming a dihydrated gypsum product followed by a de- and rehydration step
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related 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
- C04B2111/72—Repairing or restoring existing buildings or building 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
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Organic Chemistry (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to a concrete damage repairing cement-based material for prefabricated parts and application thereof, wherein the concrete damage repairing cement-based material comprises the following components, by weight, 100-150 g of water, 150-250 g of ordinary portland cement, 200-400 g of high belite sulphoaluminate cement, 50-100 g of mineral admixture, 3-5 g of carbon fiber, 10-30 g of early strength agent, 20-60 g of anti-sagging component, 2-5 g of water reducing agent, 10-20 g of gypsum powder, 3-5 g of multi-wall hydroxylated carbon nanotube, 20-40 g of expansion component, Nano-SiO22-6 g of fine aggregate and 500-700 g of fine aggregate. Compared with the prior art, the cement-based high-bonding-strength material has the advantages of short setting time, quick strength development, high bonding strength with new and old concrete, good stability and no cracking, gives consideration to social benefits and has good popularization value.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a concrete damage repairing cement-based material for prefabricated parts and application thereof.
Background
In the process of forming, demoulding, lifting, transporting, installing and using the prefabricated part, the concrete surface of the prefabricated part is damaged (edge and corner lacking) due to collision, long-term extrusion and the like, and the prefabricated part needs to be repaired in order to ensure that the product is attractive and meet the strength requirement of design, but the existing repairing material has the defects of long setting time, low strength, easiness in cracking and shrinkage, poor workability, leakage, poor surface bonding performance of new and old concrete and the like, and the reason is that no repairing material with excellent performance exists.
The existing repairing material has the technical problems of long setting time, low strength, easy cracking and shrinkage, poor construction performance, poor surface bonding performance of new and old concrete and the like. The key problem to be solved is how to invent a cement-based material for repairing concrete damage for a prefabricated part, which has the advantages of high hardening speed, no quick setting, high early strength, good bonding performance, strong anti-drying shrinkage performance, good stability, no cracking, good use effect, resource consumption saving, pollutant discharge reduction and social benefit.
Disclosure of Invention
The invention provides a concrete damage repair cement-based material for prefabricated parts, which aims to solve the technical problems of long setting time, low strength, easy cracking and shrinkage, poor construction performance, poor surface bonding performance of new and old concrete and the like of the existing concrete damage repair material for the prefabricated parts.
The technical scheme of the invention is as follows: concrete damage repair for prefabricated partThe composite cement-based material comprises, by weight, 100-150 g of water, 150-250 g of ordinary portland cement, 200-400 g of high belite sulphoaluminate cement, 50-100 g of mineral admixture, 3-5 g of carbon fiber, 10-30 g of early strength agent, 20-60 g of anti-sagging component, 2-5 g of water reducing agent, 10-20 g of gypsum powder, 3-5 g of multi-wall hydroxylated carbon nanotube, 20-40 g of expansion component, Nano-SiO2 2-6 g of fine aggregate and 500-700 g of fine aggregate.
The mineral admixture comprises fly ash and silicon powder, and the mass ratio of the fly ash to the silicon powder is as follows: silicon powder =1: 2.
The early strength agent comprises a high-efficiency early strength type A and a high-efficiency early strength type B, wherein the high-efficiency early strength type A is used at the temperature of more than 0 ℃, and the high-efficiency early strength type B is used at the temperature of less than 0 ℃.
The fine aggregate is river sand or machine-made sand washed by water, and the particle size is 0.15-4.75 mm.
The water reducing agent is a polycarboxylic acid water reducing agent.
The mass ratio of the ordinary Portland cement to the high belite sulphoaluminate cement is 1: 1-1.5.
The high-efficiency early-strength type A consists of triethanolamine, chloride, sodium thiosulfate, sodium sulfate, sodium nitrite, a water-soluble organic substance and a silane coupling agent; the high-efficiency early-strength type B consists of calcium bromide, lithium bromide, triisopropanolamine, triethanolamine, chloride, sodium thiosulfate and sodium sulfate.
An application of a concrete damage repairing cement-based material for a prefabricated part in concrete damage repairing.
The concrete damage repairing cement-based high-bonding-strength material is applied to repairing of surface damage of new concrete and surface damage of old concrete.
When the surface of the new concrete is damaged, natural pouring is adopted, the surface of the concrete is cleaned or cleaned by high-pressure gas, then the cement-based high-bonding-strength material is directly poured after being added with water and stirred according to the proportion, and demoulding can be carried out after 3-5 hours.
When the surface of old concrete is damaged, the roughness of the surface of the concrete is treated by high-pressure water flow, the surface of the concrete is cleaned by the high-pressure water flow, after the surface is air-dried, the cement-based high-bonding-strength material is added with water in proportion and stirred, and then is directly poured, and the demoulding can be carried out after 3-5 hours.
The invention has the following beneficial effects: compared with the prior art, the cement-based high-bonding-strength material has the advantages of short setting time, quick strength development, high bonding strength with new and old concrete, good stability and no cracking. The cement-based high-bonding-strength material can be quickly hardened and quickly develop strength. The initial setting time is less than or equal to 30min, the 1-day strength is more than 25MPa, and the 28-day compressive strength is more than 75 MPa.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The concrete damage repairing cement-based material for the prefabricated member comprises, by weight, 100-150 g of water, 150-250 g of ordinary portland cement, 200-400 g of high belite sulphoaluminate cement, 50-100 g of mineral admixture, 3-5 g of carbon fiber, 10-30 g of early strength agent, 20-60 g of sagging resistant component, 2-5 g of water reducing agent, 10-20 g of gypsum powder, 3-5 g of multi-wall hydroxylated carbon nanotube, 20-40 g of expansion component, Nano-SiO2 2-6 g of fine aggregate and 500-700 g of fine aggregate.
The mineral admixture comprises fly ash and silicon powder, and the mass ratio of the fly ash to the silicon powder is as follows: silicon powder =1: 2.
The early strength agent comprises a high-efficiency early strength type A and a high-efficiency early strength type B, wherein the high-efficiency early strength type A is used at the temperature of more than 0 ℃, and the high-efficiency early strength type B is used at the temperature of less than 0 ℃.
The fine aggregate is river sand or machine-made sand washed by water, and the particle size is 0.15-4.75 mm.
The water reducing agent is a polycarboxylic acid water reducing agent.
The mass ratio of the ordinary Portland cement to the high belite sulphoaluminate cement is 1: 1-1.5.
The high-efficiency early-strength type A consists of triethanolamine, chloride, sodium thiosulfate, sodium sulfate, sodium nitrite, a water-soluble organic substance and a silane coupling agent; the high-efficiency early-strength type B consists of calcium bromide, lithium bromide, triisopropanolamine, triethanolamine, chloride, sodium thiosulfate and sodium sulfate.
An application of a concrete damage repairing cement-based material for a prefabricated part in concrete damage repairing.
The concrete damage repairing cement-based high-bonding-strength material is applied to repairing of surface damage of new concrete and surface damage of old concrete.
When the surface of the new concrete is damaged, natural pouring is adopted, the surface of the concrete is cleaned or cleaned by high-pressure gas, then the cement-based high-bonding-strength material is directly poured after being added with water and stirred according to the proportion, and demoulding can be carried out after 3-5 hours.
When the surface of old concrete is damaged, the roughness of the surface of the concrete is treated by high-pressure water flow, the surface of the concrete is cleaned by the high-pressure water flow, after the surface is air-dried, the cement-based high-bonding-strength material is added with water in proportion and stirred, and then is directly poured, and the demoulding can be carried out after 3-5 hours.
The present invention will be further described with reference to examples and comparative examples (the amount of each component used in each example and comparative example is 1kg in parts by mass).
The components are mixed according to the proportion of the embodiment (and the comparative example) to prepare a test block, and various technical indexes of the test block are tested according to corresponding standards.
Example 1
| Ordinary silicic acid Salt cement | Gaoberit Thioaluminate salts Cement | Mineral blending Material | Early strength agent (general height) Strong) | Sag resistant component | Carbon fiber | Multi-walled hydroxylated carbon nanotubes （CNT） | Nano-SiO2 | Fine aggregate | MgO expansion component | Gypsum powder | Water reducing agent | Water (W) |
| 150 | 200 | 50 | 15 | 30 | 3 | 3.5 | 4.5 | 600 | 25 | 15 | 2.5 | 125 |
Initial setting time is 30 minutes, final setting time is 3.2 hours, 1d compressive strength is 29MPa, and 28d compressive strength is 58 MPa.
Example 2
| Ordinary silicic acid Salt cement | Gaoberit Thioaluminate salts Cement | Mineral blending Material | Early strength agent (general height) Strong) | Sag resistant component | Carbon fiber | Multi-walled hydroxylated carbon nanotubes （CNT） | Nano-SiO2 | Fine aggregate | MgO expansion component | Gypsum powder | Water reducing agent | Water (W) |
| 150 | 300 | 100 | 15 | 30 | 4 | 4 | 4.5 | 630 | 25 | 20 | 3.0 | 135 |
The initial setting time is 28 minutes, the final setting time is 3.0 hours, the 1d compressive strength is 32.5MPa, and the 28d compressive strength is 62 MPa.
Example 3
| Ordinary silicic acid Salt cement | Gaoberit Thioaluminate salts Cement | Mineral blending Material | Early strength agent (general height) Strong) | Sag resistant component | Carbon fiber | Multiwall hydroxylated Carbon Nanotubes (CNT) | Nano-SiO2 | Fine aggregate | MgO expansion component | Gypsum powder | Water reducing agent | Water (W) |
| 200 | 200 | 50 | 20 | 30 | 4 | 4 | 4.5 | 650 | 25 | 20 | 3.0 | 135 |
Initial setting time is 28 minutes, final setting time is 3.5 hours, 1d compressive strength is 28.5MPa, and 28d compressive strength is 60 MPa.
Example 4
| Ordinary silicic acid Salt cement | Gaoberit Thioaluminate salts Cement | Mineral blending Material | Early strength agent (high temperature and high temperature) Strong) | Anti-sagging group Is divided into | Carbon fiber | Multiwall hydroxylated Carbon Nanotubes (CNT) | Nano-SiO2 | Fine aggregate | MgO expansion component | Gypsum powder | Water reducing agent | Water (W) |
| 150 | 200 | 50 | 25 | 30 | 4 | 4 | 4.5 | 650 | 25 | 20 | 3.0 | 135 |
Initial setting time is 38 minutes, final setting time is 4.2 hours, 1d compressive strength is 28.2MPa, and 28d compressive strength is 58.5 MPa. (remarks: 0-5 ℃ construction)
Example 4
| Ordinary silicic acid Salt cement | Gaoberit Thioaluminate salts Cement | Mineral blending Material | Early strength agent (high temperature and high temperature) Strong) | Sag resistant component | Carbon fiber | Multiwall hydroxylated Carbon Nanotubes (CNT) | Nano-SiO2 | Fine aggregate | MgO expansion component | Gypsum powder | Water reducing agent | Water (W) |
| 150 | 350 | 50 | 20 | 30 | 4 | 4 | 4.5 | 650 | 25 | 20 | 3.0 | 135 |
Initial setting time is 35 minutes, final setting time is 4.0 hours, 1d compressive strength is 29.5MPa, and 28d compressive strength is 60.55 MPa. (remarks: 0-5 ℃ construction)
From the above data, it can be seen that the cement-based high bond strength material obtained in the example of the present invention: the shortest initial setting time is 28min, the longest final setting time is 4.2min, the compressive strength of 1 day reaches 32.5MPa, the bonding strength with the original concrete reaches 1.6MPa, and the maximum shrinkage rate of 3 days is 0.022 percent.
The invention compounds two kinds of ordinary portland cement and high belite sulphoaluminate cement in order to exert the advantages of two different cements simultaneously, so as to obtain the requirements of quick setting and early strength. After a proper amount of high belite sulphoaluminate cement is added into the ordinary Portland cement, the phenomenon of accelerating setting and early strength occurs, because the added sulphoaluminate cement consumes Ca (OH)2, the alkalinity of cement paste is reduced, the hydration action of calcium silicate in the ordinary Portland cement is accelerated, the hydration speed is accelerated, simultaneously, anhydrous calcium sulphoaluminate in the high belite sulphoaluminate cement is quickly reacted with gypsum to generate ettringite, the rapid setting occurs, and the early strength of the repair mortar is obviously improved. The mass ratio of the two cements is preferably 1: 1.2.
The composite system of ordinary portland cement, sulphoaluminate cement and gypsum powder (dihydrate gypsum) mainly contains silicate minerals, and has the main effect on the setting time of the system, the high belite sulphoaluminate cement with high early hydration activity is introduced, the shrinkage deformation of the repair mortar is very small due to the proper mixing amount of the sulphoaluminate cement in the composite system, and the ettringite can generate 2-2.5 times of volume expansion in the generation process, so that the micro-expansion effect of the sulphoaluminate cement is exerted.
The cement-based high-bonding-strength material provided by the invention is repaired according to the following requirements:
firstly, when the surface of new concrete is damaged, natural pouring is adopted, namely the surface of the concrete is cleaned or cleaned by high-pressure gas, then the cement-based high-bonding-strength material is directly poured after being added with water and stirred in proportion, and demoulding can be carried out after 3-5 hours.
And secondly, when the surface of the old concrete is damaged, adopting high-pressure water flow to treat the roughness of the surface of the concrete, namely cleaning the surface of the concrete by using the high-pressure water flow, after the surface is air-dried, adding water into the cement-based high-bonding-strength material in proportion, stirring, directly pouring, and demolding after 3-5 hours.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or some technical features can be replaced. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. The concrete damage repair cement-based material for the prefabricated part is characterized in that: 100-150 parts by weight of water150-250 g of ordinary portland cement, 200-400 g of high belite sulphoaluminate cement, 50-100 g of mineral admixture, 3-5 g of carbon fiber, 10-30 g of early strength agent, 20-60 g of anti-sagging component, 2-5 g of water reducing agent, 10-20 g of gypsum powder, 3-5 g of multi-wall hydroxylated carbon nanotube, 20-40 g of expansion component, Nano-SiO2 2-6 g of fine aggregate and 500-700 g of fine aggregate.
2. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the mineral admixture comprises fly ash and silicon powder, and the mass ratio of the fly ash to the silicon powder is as follows: silicon powder =1: 2.
3. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the early strength agent comprises a high-efficiency early strength type A and a high-efficiency early strength type B, wherein the high-efficiency early strength type A is used at the temperature of more than 0 ℃, and the high-efficiency early strength type B is used at the temperature of less than 0 ℃.
4. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the fine aggregate is river sand or machine-made sand washed by water, and the particle size is 0.15-4.75 mm.
5. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the water reducing agent is a polycarboxylic acid water reducing agent.
6. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the mass ratio of the ordinary Portland cement to the high belite sulphoaluminate cement is 1: 1-1.5.
7. A concrete damage repairing cement-based material for prefabricated parts according to claim 1, wherein: the high-efficiency early-strength type A consists of triethanolamine, chloride, sodium thiosulfate, sodium sulfate, sodium nitrite, a water-soluble organic substance and a silane coupling agent; the high-efficiency early-strength type B consists of calcium bromide, lithium bromide, triisopropanolamine, triethanolamine, chloride, sodium thiosulfate and sodium sulfate.
8. Use of a concrete damage-repairing cement-based material for prefabricated parts according to any one of claims 1 to 7 for repairing concrete damages.
9. The concrete damage repairing cement-based material for prefabricated parts and the use thereof according to claim 8, wherein: the concrete damage repairing cement-based high-bonding-strength material is applied to repairing of surface damage of new concrete and surface damage of old concrete.
10. The concrete damage repairing cement-based material for prefabricated parts and the use thereof according to claim 9, wherein: when the surface of the new concrete is damaged, natural pouring is adopted, the surface of the concrete is cleaned or cleaned by high-pressure gas, then the cement-based high-bonding-strength material is directly poured after being added with water and stirred according to the proportion, and demoulding can be carried out after 3-5 hours.
11. The concrete damage repairing cement-based material for prefabricated parts and the use thereof according to claim 9, wherein: when the surface of old concrete is damaged, the roughness of the surface of the concrete is treated by high-pressure water flow, the surface of the concrete is cleaned by the high-pressure water flow, after the surface is air-dried, the cement-based high-bonding-strength material is added with water in proportion and stirred, and then is directly poured, and the demoulding can be carried out after 3-5 hours.
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Application publication date: 20210312 |
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