CN112645675B - Prefabricated concrete structure steel bar sleeve grouting material - Google Patents
Prefabricated concrete structure steel bar sleeve grouting material Download PDFInfo
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- CN112645675B CN112645675B CN202110167073.XA CN202110167073A CN112645675B CN 112645675 B CN112645675 B CN 112645675B CN 202110167073 A CN202110167073 A CN 202110167073A CN 112645675 B CN112645675 B CN 112645675B
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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
- C04B28/145—Calcium sulfate hemi-hydrate with a specific crystal form
- C04B28/147—Calcium sulfate hemi-hydrate with a specific crystal form beta-hemihydrate
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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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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (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 grouting material for the prefabricated concrete structure steel bar sleeve comprises the following raw materials in parts by weight: 40-50 parts of cement, 35-45 parts of aggregate, 3.0-4.0 parts of beta-hemihydrate gypsum, 0.01-0.02 part of urea, 0.02-0.09 part of plastic expanding agent, 0.01-0.05 part of borax, 6.5-11.5 parts of ultrafine fly ash, 5.0-6.0 parts of modified reclaimed rubber powder, 0.2-1.0 part of water reducing agent and 0.001-0.003 part of defoaming agent. The fresh slurry of the grouting material has good fluidity, micro-expansion, fast strength development, early strength and high strength; the beta-semi-hydrated gypsum, the urea and the borax are used in a composite way, so that the setting time of the grouting material is effectively prolonged, the fluidity of slurry is kept, and the early strength of cement is not reduced; the organic combination of the raw materials realizes the expansion stress between the transverse expansion and the inner wall of the barrel under the condition of restraining the vertical expansion.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a grouting material for a reinforcement sleeve of an assembled concrete structure.
Background
The assembly type building completes construction of a building structure through field assembly of precast concrete members, and therefore, the assembly type building has the characteristics of high construction speed, high labor efficiency, good building quality and small climate restriction. The development history of the concrete prefabricated member can trace back to the 50 th century of the 20 th century, and the concrete prefabricated member has a long-term development of more than half a century, so that the vigorous development of the building industrialization in developed countries such as Japan and Western Europe is promoted, the application and popularization of the concrete prefabricated member in the 80 th and 90 th century of the last century in China are greatly promoted, and the development of the concrete type building product in China is always delayed due to the production technology level and the management capability at that time. In recent years, with the development and development of new materials and new technologies such as high-performance grouting materials and novel sleeves, the rising of the assembly type building industry becomes an industry consensus, and becomes one of the important directions for the development of the national building industry.
Although the prefabricated building structure has many advantages in the construction process, the prefabricated building joint sleeve connection grouting system is a great importance in the quality safety of the prefabricated building and is also a most concerned problem for construction units. The sleeve and the reinforcing steel bar are connected into a whole through the grouting material, the quality of the sleeve and the reinforcing steel bar directly influences the overall quality of the fabricated building, and therefore the bond stress between the grouting material and the reinforcing steel bar and the frictional resistance between the grouting material and the inner wall of the sleeve are critical.
Under the existing conditions, the grouting material of the reinforcement sleeve of the prefabricated concrete structure mainly takes vertical expansion as main expansion, so that the friction resistance between the grouting material and the sleeve wall is limited, how to restrict longitudinal expansion, increasing the expansion stress between transverse expansion and the inner wall of the sleeve, and increasing the expansion stress to form the best performance of the reinforcement grouting connector, which is one of the problems to be solved by the grouting system of the reinforcement sleeve of the prefabricated concrete structure. The high fluidity, high strength and stable suspension of fine aggregate in the slurry are the performance requirements which must be met by the concrete structure reinforcing steel bar sleeve grouting material.
Disclosure of Invention
The invention aims to solve the contradiction between the large fluidity and the high strength of the grouting material for the reinforced sleeve of the fabricated concrete structure, realize that the expansion stress between the transverse expansion and the inner wall of the sleeve can be adjusted and controlled by the expansion components under the condition of restraining the vertical expansion, and achieve the optimization of the mechanical property of the reinforced grouting connection joint. In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in order to realize the purpose, the invention adopts the following technical scheme:
the grouting material for the prefabricated concrete structure steel bar sleeve comprises the following raw materials in parts by weight: 45-55 parts of cement, 35-45 parts of aggregate, 3.0-4.0 parts of beta-hemihydrate gypsum, 0.01-0.02 part of urea, 0.02-0.09 part of plastic expanding agent, 0.01-0.05 part of borax, 6.5-11.5 parts of ultrafine fly ash, 5.0-6.0 parts of modified reclaimed rubber powder, 0.2-1.0 part of water reducing agent and 0.001-0.003 part of defoaming agent.
Preferably, the particle size of the ultrafine fly ash is 1.0-1.8, and the specific surface area is 500-900m2/kg。
Preferably, the modified reclaimed rubber powder is prepared by crushing modified waste tire tread rubber, and the particle size of the modified reclaimed rubber powder is 150-200 meshes.
Preferably, the preparation method of the modified reclaimed rubber powder comprises the following steps:
(1) weighing 88 parts of waste tire tread rubber powder, adding 0.3 part of taurine, and then adding 10 parts of regenerated softening oil;
(2) stirring at 1800r/min for 6min, filtering, and air drying to obtain modified reclaimed rubber powder.
Preferably, the diameter of the vitrified microsphere is 200 μm to 600 μm; the particle size of the beta-hemihydrate gypsum is 450-500 nm.
Preferably, the cement consists of ordinary portland cement and magnesium phosphate cement, wherein the mass ratio of the ordinary portland cement to the magnesium phosphate cement is 4-5: 1.
preferably, the water reducing agent is sulfonated melamine formaldehyde resin and calcium lignosulfonate; the mass ratio of the sulfonated melamine formaldehyde resin to the calcium lignosulfonate is 1.5-2.5: 1.
preferably, the aggregate is river sand, quartz sand or expanded perlite.
Advantageous effects
1. The fresh slurry of the grouting material has good fluidity, micro expansion, fast strength development, early strength and high strength, has excellent workability and construction performance, can meet the requirements of a steel bar sleeve grouting technology, and has positive and important significance for assembly type building construction;
2. the beta-semi-hydrated gypsum, the urea and the borax are used in a composite way, so that the setting time of the grouting material is effectively prolonged, the fluidity of slurry is kept, the early strength of cement cannot be reduced, and the operability strength is controlled in a reasonable range;
3. the organic combination of the raw materials realizes the expansion stress between the transverse expansion and the inner wall of the barrel under the condition of restraining the vertical expansion, so that the best mechanical property of the steel bar grouting connecting joint is achieved.
Detailed Description
The technical solutions of the present invention are clearly and completely described below by way of examples and comparative examples, and it is obvious that the examples described below are only a part of the examples of the present invention, and not all of the examples. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The grouting material for the prefabricated concrete structure steel bar sleeve comprises the following raw materials in parts by weight: 36 parts of ordinary portland cement, 9 parts of magnesium phosphate cement, 45 parts of river sand, 3.0 parts of beta-hemihydrate gypsum, 0.02 part of urea, 0.02 part of plastic expanding agent, 0.05 part of borax, 6.5 parts of ultrafine fly ash, 6.0 parts of modified reclaimed rubber powder, 0.2 part of water reducing agent and 0.003 part of defoaming agent.
Wherein the particle diameter of the ultrafine fly ash is 1.0-1.8 μm, and the specific surface area is 500-900m2/kg。
The modified reclaimed rubber powder is prepared by crushing modified waste tire tread rubber, and the particle size of the modified reclaimed rubber powder is 150-200 meshes; the preparation method comprises the following steps:
(1) weighing 88 parts of waste tire tread rubber powder, adding 0.3 part of taurine, and then adding 10 parts of regenerated softening oil;
(2) stirring at 1800r/min for 6min, filtering, and air drying to obtain modified reclaimed rubber powder.
During construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.12 for stirring, and the stirring time is 8min, so that the mortar can be used for construction.
Example 2
The grouting material for the prefabricated concrete structure steel bar sleeve comprises the following raw materials in parts by weight: 45.8 parts of ordinary portland cement, 9 parts of magnesium phosphate cement, 35 parts of quartz sand, 4.0 parts of beta-hemihydrate gypsum, 0.01 part of urea, 0.09 part of plastic expanding agent, 0.01 part of borax, 11.5 parts of ultrafine fly ash, 5.0 parts of modified regenerated rubber powder, 1.0 part of water reducing agent and 0.001 part of defoaming agent. The particle diameter of the ultrafine fly ash is 1.0-1.8 mu m, and the specific surface area is 500-900m2/kg。
The modified reclaimed rubber powder is prepared by crushing modified waste tire tread rubber, the particle size of the modified reclaimed rubber powder is 150-200 meshes, and the preparation method comprises the following steps:
(1) weighing 88 parts of waste tire tread rubber powder, adding 0.3 part of taurine, and then adding 10 parts of regenerated softening oil;
(2) stirring at 1800r/min for 6min, filtering, and air drying to obtain modified reclaimed rubber powder.
During construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.15 for stirring, and the stirring time is 8min, so that the mortar can be used for construction.
Example 3
The grouting material for the prefabricated concrete structure steel bar sleeve comprises the following raw materials in parts by weight: 40 parts of ordinary portland cement, 10 parts of magnesium phosphate cement, 40 parts of expanded perlite, 3.5 parts of beta-hemihydrate gypsum, 0.015 part of urea, 0.06 part of plastic expanding agent, 0.03 part of borax, 9.0 parts of ultrafine fly ash, 5.5 parts of modified reclaimed rubber powder, 0.6 part of water reducing agent and 0.002 part of defoaming agent.
Wherein the particle diameter of the ultrafine fly ash is 1.0-1.8, and the specific surface area is 500-900m2/kg。
Preferably, the modified reclaimed rubber powder is prepared by crushing modified waste tire tread rubber, and the particle size of the modified reclaimed rubber powder is 150-200 meshes.
Preferably, the preparation method of the modified reclaimed rubber powder comprises the following steps:
(1) weighing 88 parts of waste tire tread rubber powder, adding 0.3 part of taurine, and then adding 10 parts of regenerated softening oil;
(2) stirring at 1800r/min for 6min, filtering, and air drying to obtain modified reclaimed rubber powder.
During construction, a mortar mixer is adopted for stirring, water is added according to the water-material ratio of 0.15 for stirring, and the stirring time is 8min, so that the mortar can be used for construction.
The performance indexes of the grouting materials prepared in the embodiments are detected (refer to the standard grouting for connecting steel bar sleeves JG/T408-2013), and the detection results of the obtained performance indexes are shown in the following table 1:
TABLE 1
From the test results, the fresh slurry of the grouting material has good fluidity, micro expansion, fast strength development, early strength and high strength, excellent workability and construction performance, and can meet the requirements of the grouting technology of the steel sleeve.
Finally, it should be noted that: the above specific examples are only used to illustrate the technical solutions of the present invention, but not to limit the same; although the invention has been described in detail with reference to the foregoing specific embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. The prefabricated concrete structure steel bar sleeve grouting material is characterized by comprising the following raw materials in parts by mass: 45-55 parts of cement, 35-45 parts of aggregate, 3.0-4.0 parts of beta-hemihydrate gypsum, 0.01-0.02 part of urea, 0.02-0.09 part of plastic expanding agent, 0.01-0.05 part of borax, 6.5-11.5 parts of ultrafine fly ash, 5.0-6.0 parts of modified reclaimed rubber powder, 0.2-1.0 part of water reducing agent and 0.001-0.003 part of defoaming agent; the preparation method of the modified reclaimed rubber powder comprises the following steps: (1) weighing 88 parts of waste tire tread rubber powder, adding 0.3 part of taurine, and then adding 10 parts of regenerated softening oil; (2) stirring at 1800r/min for 6min, filtering, and air drying to obtain modified reclaimed rubber powder.
2. The reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the particle size of the ultrafine fly ash is 1.0-1.8 μm, and the specific surface area is 500-900m2/kg。
3. The reinforcing steel bar sleeve grouting material as claimed in claim 1, wherein the modified reclaimed rubber powder is prepared by crushing modified waste tire tread rubber, and the particle size of the modified reclaimed rubber powder is 150-200 meshes.
4. The rebar sleeve grouting material as claimed in claim 1, wherein the particle size of the beta-hemihydrate gypsum is 450-500 nm.
5. The reinforced bar sleeve grouting material of claim 1, wherein the cement is composed of ordinary portland cement and magnesium phosphate cement, and the mass ratio of the ordinary portland cement to the magnesium phosphate cement is 4-5: 1.
6. the reinforced sleeve grout of claim 1, wherein the water reducing agent is sulfonated melamine formaldehyde resin and calcium lignosulfonate; the mass ratio of the sulfonated melamine formaldehyde resin to the calcium lignosulfonate is 1.5-2.5: 1.
7. the reinforced sleeve grout of claim 1, wherein the aggregate is river sand, quartz sand or expanded perlite.
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| CN202110167073.XA CN112645675B (en) | 2021-02-07 | 2021-02-07 | Prefabricated concrete structure steel bar sleeve grouting material |
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| CN202110167073.XA CN112645675B (en) | 2021-02-07 | 2021-02-07 | Prefabricated concrete structure steel bar sleeve grouting material |
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| CN112645675B true CN112645675B (en) | 2022-01-07 |
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| CN113213878A (en) * | 2021-06-16 | 2021-08-06 | 上海宝生新型建材有限公司 | Environment-friendly sleeve grouting material for connecting reinforcing steel bars |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397202A (en) * | 2008-10-16 | 2009-04-01 | 中国建筑第六工程局有限公司 | Rubber aggregate grouting material |
| WO2013078675A1 (en) * | 2011-12-02 | 2013-06-06 | Dow Global Technologies Llc | Rubber powder modified tile grout |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110451897A (en) * | 2019-08-01 | 2019-11-15 | 江苏建鸿环保材料科技有限公司 | A kind of grouting material, application and its construction method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101397202A (en) * | 2008-10-16 | 2009-04-01 | 中国建筑第六工程局有限公司 | Rubber aggregate grouting material |
| WO2013078675A1 (en) * | 2011-12-02 | 2013-06-06 | Dow Global Technologies Llc | Rubber powder modified tile grout |
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