CN106186899B - Sleeve grouting material for connecting prefabricated concrete structure steel bars - Google Patents
Sleeve grouting material for connecting prefabricated concrete structure steel bars Download PDFInfo
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- CN106186899B CN106186899B CN201610437652.0A CN201610437652A CN106186899B CN 106186899 B CN106186899 B CN 106186899B CN 201610437652 A CN201610437652 A CN 201610437652A CN 106186899 B CN106186899 B CN 106186899B
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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
- C04B28/04—Portland 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides a sleeve grouting material which can well exert expansion performance without wet maintenance and consists of cement, fine sand, a composite expanding agent, a water reducing agent, water-absorbent resin, semi-hydrated gypsum, sodium bicarbonate and spherical silicon dioxide.
Description
Technical Field
The invention relates to a cement-based grouting material, in particular to a sleeve grouting material which can be used for connecting industrial fabricated concrete structure reinforcing steel bars.
Background
At present, most buildings in China adopt a cast-in-place reinforced concrete structure, and after reinforcing steel bars are bound, fixed or welded in advance, concrete is poured, and after the concrete is hardened, the concrete and the reinforcing steel bars form an integrated reinforced concrete structure. The prefabricated concrete structure is different from a cast-in-place reinforced concrete structure in that reinforced concrete members are manufactured in a prefabrication factory and then transported to a construction site for on-site assembly, steel sleeves for connecting the steel bars are generally installed inside the prefabricated members in order to firmly connect the steel bars among the members together, and grouting technology is adopted at the installation site to connect the prefabricated members together through the steel bars and the steel sleeves. The material for connecting the steel bar sleeves is a cement-based grouting material with good fluidity, high strength and micro-expansion and non-contraction, and the execution standard of the material is JG/T408-2013 sleeve grouting material for connecting the steel bars.
In the actual use process, in order to ensure that the steel sleeve, the reinforcing steel bar and the grouting material can be firmly connected together, the grouting material is required to have certain expansion performance after being hardened, and the phenomenon that a gap is formed between the grouting material and the sleeve after contraction to cause connection force reduction and even connection failure is avoided, so that an expansion component is required to be added in the formula design of the grouting material. The cement concrete expanding agent commonly used in the market at present requires wet curing (by adopting methods such as watering or film covering) so that the expanding agent can better play a role. However, for steel sleeve connection grouting, grouting materials are completely poured into a steel sleeve, the steel sleeve belongs to a closed environment, and wet maintenance cannot be performed from the outside, so if a common cement concrete expanding agent is added into the grouting materials, and no extra measures are taken, the expansion performance of the grouting materials cannot be exerted, the connection force between the steel sleeve and the steel bar may be reduced, particularly in the connection of HRB 500-grade high-strength steel bars and the sleeve, the problem that the steel bars are pulled out in a sliding manner can occur, and the requirement that the steel bars must be buckled or broken cannot be met.
Disclosure of Invention
The invention provides a sleeve grouting material which can well exert the expansion performance in a closed environment without wet curing.
The sleeve grouting material provided by the invention is composed of cement, fine sand, a composite expanding agent, a water reducing agent, water-absorbent resin, semi-hydrated gypsum, sodium bicarbonate and spherical silicon dioxide.
The sleeve grouting material provided by the invention comprises the following components in parts by weight:
cement: 100 portions of
Fine sand: 90 to 110 portions of
Water-absorbent resin: 0.05 to 0.2 portion
A composite expanding agent: 5-8 parts of
Semi-hydrated gypsum: 2-6 parts of
Sodium bicarbonate: 1-3 parts of
Spherical silica: 5-10 parts of
Polycarboxylic acid water reducing agent: 0.4 to 0.6 portion
Defoaming agent: 0.1 to 0.2 portion
In the above proportion, the cement is Portland cement of 52.5 grade or 62.5 grade. The fine sand is artificial sand or natural sand, and has a particle size of 0.5-2 mm. The particle size of the water-absorbent resin ranges from 0.01mm to 0.05mm, and the water absorption is 400-800 times. The composite expanding agent is a mixture of light-burned magnesium oxide and natural alunite powder, wherein the weight of the light-burned magnesium oxide accounts for 60-80 percent, and the weight of the natural alunite powder accounts for 20-40 percent; the calcination temperature of the light-calcined magnesia is 700-850 ℃, and the specific surface area is 200-300m2Per kg; the alumen powder has alumen content of 40-60% and specific surface area not less than 200m2The/kg. hemihydrate gypsum is α type hemihydrate gypsum, and has specific surface area not less than 200m2In terms of/kg. The specific surface area of sodium bicarbonate is not less than 200m2In terms of/kg. The particle size range of the spherical silica is 400-800 meshes. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is not lower than 25%. The defoaming agent is P803 or RE2971, and other powdery defoaming agents with the same defoaming effect can be selected through tests.
The components are weighed according to the proportion in a factory, fed, uniformly stirred and bagged, after being conveyed to a construction site, water accounting for 13-15% of the weight of the powder is added, and sleeve grouting can be carried out after uniform mechanical or manual stirring.
The sleeve grouting material provided by the invention is doped with a certain amount of water-absorbent resin, and the water-absorbent resin can absorb water in the field stirring process of the grouting material and gradually release the water when the internal water is reduced after the grouting material is hardened so as to provide water for the expansion reaction of the expansion component. The particle size and water absorption of the water-absorbent resin are controlled to prevent the water-absorbent resin from forming a weak cavity in the grouting material due to an excessively large volume after swelling by absorbing water, thereby reducing the strength of the grouting material. Since the slurry is a salt solution containing various ions after the grouting material is stirred with water, the water absorption of the water-absorbent resin is different from that of pure water. Through a plurality of tests, the particle size and the water absorption rate of the water-absorbent resin are preferably selected, and the condition that the water-absorbent resin has little influence on the compressive strength of the grouting material after water absorption and expansion is ensured.
The invention adopts the mixture of the light-burned magnesia and the natural alunite powder as the expansion component, wherein the light-burned magnesia requires less water for the expansion reaction and can continuously expand in the later period. The natural alunite powder can react with gypsum in the early stage to generate the alunite which plays an expansion role, but the market price of the alunite powder is lower than that of the alunite expansion agent.
The semi-hydrated gypsum and the sodium bicarbonate can generate chemical reaction after being added with water and stirred to generate the dihydrate gypsum, sodium sulfate and carbon dioxide. The dihydrate gypsum can be used as a raw material required by the alum stone powder expansion reaction, the sodium sulfate can be used as an early strength agent of cement, and the carbon dioxide can be used as an expansion component of the early plastic stage of the grouting material to compensate the early plastic shrinkage of the grouting material.
The spherical silica can improve the fluidity of the grouting material to compensate for the decrease in the popularity of the grouting material due to the water swelling of the water absorbent resin.
The water reducing agent is mainly used for reducing the water consumption of the grouting material and improving the fluidity and the strength of the grouting material. The defoaming agent is used for eliminating bubbles formed in the grouting material during stirring, so that the compactness and strength of the material are improved.
The sleeve grouting material provided by the invention can meet the requirements of the standard JG/T408-2013 sleeve grouting material for steel bar connection, and can generate continuous and stable expansion reaction under the condition that moist curing cannot be performed after construction, so that the connecting force between the steel bar and the steel sleeve is improved, and the sleeve grouting material can be used for grouting connection between HRB 500-grade high-strength steel bars and sleeves.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative only and not limiting.
The embodiment of the invention provides a sleeve grouting material which can well exert the expansion performance in a closed environment without wet curing.
The sleeve grouting material provided by the embodiment of the invention consists of cement, fine sand, a composite expanding agent, a water reducing agent, water-absorbent resin, semi-hydrated gypsum, sodium bicarbonate and spherical silicon dioxide.
The sleeve grouting material provided by the invention comprises the following components in parts by weight:
cement: 100 portions of
Fine sand: 90 to 110 portions of
Water-absorbent resin: 0.05 to 0.2 portion
A composite expanding agent: 5-8 parts of
Semi-hydrated gypsum: 2-6 parts of
Sodium bicarbonate: 1-3 parts of
Spherical silica: 5-10 parts of
Polycarboxylic acid water reducing agent: 0.4 to 0.6 portion
Defoaming agent: 0.1 to 0.2 portion
In the above proportion, the cement is Portland cement of 52.5 grade or 62.5 grade. The fine sand is artificial sand or natural sand, and has a particle size of 0.5-2 mm. The particle size of the water-absorbent resin ranges from 0.01mm to 0.05mm, and the water absorption rate is 400-800 times. The composite expanding agent is a mixture of light-burned magnesium oxide and natural alunite powder, wherein the weight of the light-burned magnesium oxide accounts for 60-80 percent, and the weight of the natural alunite powder accounts for 20-40 percent; the calcination temperature of the light-calcined magnesia is 700-850 ℃, and the specific surface area is 200-300m2Per kg; the alumen powder has alumen content of 40-60% and specific surface area not less than 200m2The/kg. hemihydrate gypsum is α type hemihydrate gypsum, and has specific surface area not less than 200m2In terms of/kg. The specific surface area of sodium bicarbonate is not less than 200m2In terms of/kg. The particle size range of the spherical silica is 400-800 meshes. The water reducing agent is a polycarboxylic acid high-efficiency water reducing agent, and the water reducing rate is not lower than 25%. The defoaming agent is P803 or RE2971, and can also be usedOther powdery defoaming agents with the same defoaming effect are selected for the test.
The components are weighed according to the proportion in a factory, fed, uniformly stirred and bagged, after being conveyed to a construction site, water accounting for 13-15% of the weight of the powder is added, and sleeve grouting can be carried out after uniform mechanical or manual stirring.
The sleeve grouting material provided by the invention is doped with a certain amount of water-absorbent resin, and the water-absorbent resin can absorb water in the field stirring process of the grouting material and gradually release the water when the internal water is reduced after the grouting material is hardened so as to provide water for the expansion reaction of the expansion component. The particle size and water absorption of the water-absorbent resin are controlled to prevent the water-absorbent resin from forming a weak cavity in the grouting material due to an excessively large volume after swelling by absorbing water, thereby reducing the strength of the grouting material. Since the slurry is a salt solution containing various ions after the grouting material is stirred with water, the water absorption of the water-absorbent resin is different from that of pure water. Through a plurality of tests, the particle size and the water absorption rate of the water-absorbent resin are preferably selected, and the condition that the water-absorbent resin has little influence on the compressive strength of the grouting material after water absorption and expansion is ensured.
The invention adopts the mixture of the light-burned magnesia and the natural alunite powder as the expansion component, wherein the light-burned magnesia requires less water for the expansion reaction and can continuously expand in the later period. The natural alunite powder can react with gypsum in the early stage to generate the alunite which plays an expansion role, but the market price of the alunite powder is lower than that of the alunite expansion agent.
The semi-hydrated gypsum and the sodium bicarbonate can generate chemical reaction after being added with water and stirred to generate the dihydrate gypsum, sodium sulfate and carbon dioxide. The dihydrate gypsum can be used as a raw material required by the alum stone powder expansion reaction, the sodium sulfate can be used as an early strength agent of cement, and the carbon dioxide can be used as an expansion component of the early plastic stage of the grouting material to compensate the early plastic shrinkage of the grouting material.
The spherical silica can improve the fluidity of the grouting material to compensate for the decrease in the popularity of the grouting material due to the water swelling of the water absorbent resin.
The water reducing agent is mainly used for reducing the water consumption of the grouting material and improving the fluidity and the strength of the grouting material. The defoaming agent is used for eliminating bubbles formed in the grouting material during stirring, so that the compactness and strength of the material are improved.
The sleeve grouting material provided by the invention can meet the requirements of the standard JG/T408-2013 sleeve grouting material for steel bar connection, and can generate continuous and stable expansion reaction under the condition that moist curing cannot be performed after construction, so that the connecting force between the steel bar and the steel sleeve is improved, and the sleeve grouting material can be used for grouting connection between HRB 500-grade high-strength steel bars and sleeves.
Example 1:
52.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 110 kg
Water-absorbent resin: 0.05 kg
A composite expanding agent: 5 kg (wherein the light-burned magnesia is 60 percent, and the alunite powder is 40 percent)
α hemihydrate Gypsum Fibrosum 4 kg
Sodium bicarbonate: 2 kg of
600 mesh spherical silica: 10 kg of
Polycarboxylic acid water reducing agent: 0.5 kg
P803 antifoaming agent: 0.1 kg
The raw materials with the mass are weighed in a factory, added into a stirrer and uniformly stirred and bagged, when the grouting material is used, water with the mass being 14% of that of the powder is added and uniformly stirred, and then steel sleeve grouting construction can be carried out, at the moment, the initial fluidity of the grouting material can reach 340mm, the fluidity in 30 minutes can reach 320mm, and other indexes can meet the standard requirements of JG/T408-2013 sleeve grouting material for reinforcing steel bar connection.
Example 2:
62.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 100 kg of
Water-absorbent resin: 0.2 kg
A composite expanding agent: 6 kg (wherein, the light-burned magnesia is 80 percent, and the alunite powder is 20 percent)
α hemihydrate Gypsum Fibrosum 5 kg
Sodium bicarbonate: 3 kg of
400 mesh spherical silica: 8 kg of
Polycarboxylic acid water reducing agent: 0.6 kg
RE2971 antifoam agent: 0.1 kg
The raw materials with the mass are weighed in a factory, added into a stirrer and uniformly stirred and bagged, when the grouting material is used, water with the mass of 13.5% of that of the powder is added and uniformly stirred, and then steel sleeve grouting construction can be carried out, at the moment, the initial fluidity of the grouting material can reach 330mm, the fluidity of the grouting material is 300mm in 30 minutes, all other indexes can meet the standard requirements of JG/T408-2013 sleeve grouting material for reinforcing steel bar connection, and the grouting material has stable later-stage expansion performance. Adopting HRB500 grade high strength steel bar and steel sleeve to carry out grouting test, maintaining the grouted steel sleeve and test block for 14d under laboratory standard condition, and preserving the compression strength of the test block to 90.5MPa, and carrying out steel sleeve drawing test at the moment, wherein 6 steel sleeve positive drawing tests are steel bar breaking.
Example 3:
52.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 90 kg of
Water-absorbent resin: 0.1 kg
A composite expanding agent: 8 kg (wherein the light-burned magnesia is 60 percent, and the alunite powder is 40 percent)
α semi-hydrated gypsum 6 kg
Sodium bicarbonate: 3 kg of
Spherical silica of 800 meshes: 5 kg of
Polycarboxylic acid water reducing agent: 0.5 kg
RE2971 antifoam agent: 0.15 kg
Weighing the raw materials in the mass in a factory, adding the raw materials into a stirrer, uniformly stirring and bagging the raw materials, adding water accounting for 13-15% of the mass of the powder when the grouting material is used, and uniformly stirring the mixture to perform steel sleeve grouting construction, wherein all indexes of the grouting material can meet the standard requirements of JG/T408-plus 2013 sleeve grouting material for steel bar connection.
Claims (9)
1. The utility model provides a prefabricated concrete structure sleeve grouting material for steel bar connection which characterized in that:
the contents of the components in parts by weight are as follows:
cement: 100 portions of
Fine sand: 90 to 110 portions of
Water-absorbent resin: 0.05 to 0.2 portion
A composite expanding agent: 5-8 parts of
Semi-hydrated gypsum: 2-6 parts of
Sodium bicarbonate: 1-3 parts of
Spherical silica: 5-10 parts of
Polycarboxylic acid water reducing agent: 0.4 to 0.6 portion
Defoaming agent: 0.1 to 0.2 portion.
2. A sleeve grouting material for reinforcing bar connection of an assembled concrete structure according to claim 1, wherein: the particle size range of the water-absorbent resin is 0.01mm-0.05mm, and the water absorption is 400-800 times.
3. A sleeve grouting material for reinforcing bar connection of an assembled concrete structure according to claim 1, wherein: the composite expanding agent is a mixture of light-burned magnesium oxide and natural alunite powder.
4. A sleeve grouting material for the connection of reinforcing steel bars of an assembled concrete structure as claimed in claim 1, wherein the hemihydrate gypsum is α type hemihydrate gypsum, and the specific surface area is not less than 200m2/kg。
5. A sleeve grouting material for reinforcing bar connection of an assembled concrete structure according to claim 1, wherein: the specific surface area of the sodium bicarbonate is not less than 200m2/kg。
6. A sleeve grouting material for reinforcing bar connection of an assembled concrete structure according to claim 1, wherein: the water reducing rate of the polycarboxylate superplasticizer is not lower than 25%.
7. The casing grouting material for the connection of steel bars of an assembled concrete structure as claimed in claim 1, wherein the cement is 52.5-grade portland cement, the fine sand is 0.5-2.0mm fine sand, the semi-hydrated gypsum is α semi-hydrated gypsum, the spherical silica is 600 mesh spherical silica, the defoamer is P803 defoamer, and the content of each component in parts by weight is:
52.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 110 kg
Water-absorbent resin: 0.05 kg
A composite expanding agent: 5 kg, wherein the light-burned magnesia accounts for 60 percent, and the alunite powder accounts for 40 percent
α hemihydrate Gypsum Fibrosum 4 kg
Sodium bicarbonate: 2 kg of
600 mesh spherical silica: 10 kg of
Polycarboxylic acid water reducing agent: 0.5 kg
P803 antifoaming agent: 0.1 kg
8. A sleeve grouting material for connecting reinforcement of an assembled concrete structure as claimed in claim 1, wherein the cement is 62.5-grade portland cement, the fine sand is 0.5-2.0mm fine sand, the semi-hydrated gypsum is α semi-hydrated gypsum, the spherical silica is 400 mesh spherical silica, the defoamer is RE2971 defoamer, and the content of each component in parts by weight is as follows:
62.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 100 kg of
Water-absorbent resin: 0.2 kg
A composite expanding agent: 6 kg, wherein the content of the light-burned magnesia is 80 percent, and the content of the alunite powder is 20 percent
α hemihydrate Gypsum Fibrosum 5 kg
Sodium bicarbonate: 3 kg of
400 mesh spherical silica: 8 kg of
Polycarboxylic acid water reducing agent: 0.6 kg
RE2971 antifoam agent: 0.1 kg.
9. A sleeve grouting material for connecting reinforcement of an assembled concrete structure as claimed in claim 1, wherein the cement is 52.5-grade portland cement, the fine sand is 0.5-2.0mm fine sand, the semi-hydrated gypsum is α semi-hydrated gypsum, the spherical silica is 800 mesh spherical silica, and the defoamer RE2971 defoamer comprises the following components in parts by weight:
52.5-grade portland cement: 100 kg of
Fine sand of 0.5-2.0 mm: 90 kg of
Water-absorbent resin: 0.1 kg
A composite expanding agent: 8 kg, wherein the content of the light burned magnesia is 60 percent, and the content of the alunite powder is 40 percent
α semi-hydrated gypsum 6 kg
Sodium bicarbonate: 3 kg of
Spherical silica of 800 meshes: 5 kg of
Polycarboxylic acid water reducing agent: 0.5 kg
RE2971 antifoam agent: 0.15 kg.
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| CN106830817A (en) * | 2016-12-26 | 2017-06-13 | 安徽新瑞重工股份有限公司 | A kind of prefabricated concrete structure precast floor slab grouting material |
| CN113416052A (en) * | 2021-07-30 | 2021-09-21 | 四川兴事发门窗有限责任公司 | Composite inorganic fireproof core material for door frame |
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| JP3445932B2 (en) * | 1998-04-17 | 2003-09-16 | 新東京国際空港公団 | Jointing concrete and jointing method using the joining concrete |
| CN103553479B (en) * | 2013-09-24 | 2015-12-23 | 河北达奥达建材科技有限公司 | A kind of low-viscosity neutrel grouting material that can be used for the industries such as nuclear power |
| CN105236869A (en) * | 2014-07-08 | 2016-01-13 | 上海城建物资有限公司 | Special high strength grouting material for connecting reinforcement sleeve |
| CN104402363B (en) * | 2014-09-16 | 2016-08-24 | 柳州欧维姆机械股份有限公司 | A kind of bar connecting sleeve grouting material and preparation method thereof |
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