CN113060998B - Sleeve grouting material for connecting reinforcing steel bars in winter construction and preparation method thereof - Google Patents
Sleeve grouting material for connecting reinforcing steel bars in winter construction and preparation method thereof Download PDFInfo
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- CN113060998B CN113060998B CN202110425060.8A CN202110425060A CN113060998B CN 113060998 B CN113060998 B CN 113060998B CN 202110425060 A CN202110425060 A CN 202110425060A CN 113060998 B CN113060998 B CN 113060998B
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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
- 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
- C04B28/06—Aluminous 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
- 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
- C04B28/34—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 cold phosphate binders
-
- 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
-
- 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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- 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 discloses a sleeve grouting material for connecting reinforcing steel bars in winter construction and a preparation method thereof. The grouting material mainly comprises raw materials such as cement, mineral admixture, aggregate, coagulation regulating component, expanding agent, water reducing agent, defoaming agent, rust inhibitor, water-retaining agent, redispersible latex powder, rheological stabilizer, antifreezing agent and the like, and is used for grouting connection of the ribbed steel bar sleeve of the prefabricated concrete component of the fabricated building under the environment of-10 ℃. The composite material still has good hydration characteristic under the low-temperature condition of winter assembly type construction, can meet the requirements of related performance indexes in the industrial standard JG/T408 sleeve grouting material for reinforcing steel bar connection only by conventional maintenance and without auxiliary heat, and has the performances of a double-expansion system, good fluidity, low chloride ion content, early stage, high strength, no shrinkage and the like. The manufacturing method is simple, the operation is easy, and the construction requirements are met.
Description
Technical Field
The invention belongs to the technical field of fabricated buildings, and particularly relates to sleeve grouting material for connecting reinforcing steel bars in winter construction and a preparation method thereof.
Background
At present, China is in the modern industrial development stage, the rapid development of economy, the optimization transformation of industrial structures and the urgent disappearance of environmental protection tasks are the urgent disappearance of population dividends, so that a good development opportunity is brought to an assembly type building which is a novel green and environment-friendly structural system, and the assembly type building is one of the key directions of the building structure development in China. According to the national development target, the assembled building occupies 30% of the area of the newly built building by 2025 years.
Grout muffjoint is the main mode of assembled building longitudinal connection, and the principle is that pours into sleeve grout into the sleeve, fully contacts with both ends reinforcing bar, and grout sclerosis back closely meshes with the horizontal rib and the sleeve inner wall recess or the fin of reinforcing bar, realizes the connection of 2 reinforcing bars from top to bottom. The prefabricated concrete prefabricated member connection structure has the advantages of reliable anti-seismic performance, simplicity and convenience in construction, and capability of shortening the construction period, is suitable for connection of ribbed steel bars with different diameters, and more importantly, seamless connection among members is really achieved, and the problem of prefabricated concrete assembled member connection is solved. The sleeve grout fastens the reinforcing steel bars through self expansibility, and the acting force of the reinforcing steel bars and the sleeve grout, and the acting force of the sleeve grout and the inner wall of the sleeve are enhanced. Therefore, the performance of the sleeve grouting material is the key for realizing the longitudinal connection of the prefabricated parts, and the quality of the performance plays a crucial role in ensuring the integrity and the seismic performance of a structural system.
In recent years, the development of prefabricated concrete structures in China is faster and faster, and a plurality of projects still need construction operation in winter according to the arrangement of construction progress. During the period, the daily average temperature is reduced to below 5 ℃, cement hydration is limited under the low-temperature condition, the early strength is too low, and freezing expansion and frost heaving damage can be generated in the process of cooling and freezing water. The inner structure of the grouting material slurry can be damaged by the shortness of powder from the outside to the inside due to icing, construction cannot be carried out, the maintenance cost is too high in winter, and the construction steps are complicated, so that the development of the fabricated building is limited. Therefore, a plurality of scholars and manufacturers in the market develop the low-temperature sleeve grouting material suitable for the temperature of-5 to 10 ℃, the construction requirement can be met at the lowest level under the condition of-5 ℃, the related description and technical indexes of the low-temperature sleeve grouting material in the industrial standard JG/T408 sleeve grouting material for steel bar connection are met, but the construction environment temperature in the actual engineering can be as low as-10 ℃ or even lower, and the requirement on the sleeve grouting material is more severe.
Therefore, the high-performance sleeve grouting material for connecting the-10 ℃ ultralow-temperature type reinforcing steel bars during winter construction is developed, on one hand, a larger temperature reserve is provided for the existing low-temperature type sleeve grouting material suitable for-5-10 ℃, on the other hand, the applicable temperature is expanded, and the high-performance sleeve grouting material has important practical significance and research value.
Disclosure of Invention
The invention aims to provide sleeve grouting material for connecting reinforcing steel bars in winter construction and a preparation method thereof.
The sleeve grouting material for connecting the reinforcing steel bars in winter construction comprises the following components in parts by weight: 35-55 parts of cement, 5-15 parts of mineral admixture, 35-50 parts of aggregate, 3-6 parts of coagulation regulating component, 2-5 parts of expanding agent, 0.1-0.45 part of water reducing agent, 0.1-0.5 part of defoaming agent, 0.01-1 part of rust inhibitor, 0.01-0.06 part of water-retaining agent, 0-0.3 part of redispersible latex powder, 0.05-0.15 part of rheological stabilizer and 0-1 part of antifreezing agent.
The cement is one or more of portland cement, sulphoaluminate cement, high-alumina cement and magnesium phosphate cement, and the strength grade of the cement is 42.5R, 42.5R or more.
The mineral admixture is one or more of silica fume, micro-bead fly ash, superfine slag powder, coarse whiting superfine powder, gas phase method silicon dioxide and metakaolin; the slag powder is superfine slag powder of grade above S95; the fumed silica is a fumed silica produced by wacker, germany.
The aggregate is one or more of river sand, carborundum, machine-made sand and corundum. The aggregate particles are 65-80% in 20-40 meshes, 10-25% in 40-70 meshes and 0-10% in 70-140 meshes according to the total weight percentage.
The set-regulating component comprises a set retarder and a set accelerator; the retarder is one or more of gypsum, tartaric acid, boric acid, citric acid and sodium gluconate; the coagulant is one or more of lithium carbonate, lithium sulfate, calcium nitrite and sodium nitrite.
The swelling agent comprises a front swelling agent and a rear swelling agent; the plastic expanding agent is adopted at the earlier stage and is one or the combination of a nitrogen-containing organic compound, a sulfonyl hydrazine compound and a nitroso compound; the later-stage expanding agent is one or more of ettringite expanding agents, quicklime expanding agents and calcium sulphoaluminate expanding agents. Preferably, azodicarbonamide is selected and used, the azodicarbonamide is subjected to early micro-expansion at negative temperature, the filling degree in a plastic state is ensured, and a plastic gas generating system generates nitrogen, so that the corrosion to the steel bar is avoided; the later stage adopts a composite expanding agent, one or more of an ettringite expanding agent, a quicklime expanding agent and a calcium sulphoaluminate expanding agent, the later stage expansion compensates the shrinkage in a hardening state, more preferably, an electrochemical DENKA BEFORM series ettringite expanding agent is adopted, and the ettringite can fill gaps and also can improve the early strength.
The water reducing agent is one or more of sulfamate high-efficiency water reducing agents, melamine high-efficiency water reducing agents and polycarboxylic acid high-efficiency water reducing agents. Preferably, a polycarboxylic acid type superplasticizer is selected, and more preferably, a 325C type superplasticizer manufactured by Sika of Switzerland and a F10 type superplasticizer manufactured by Pasov, Germany are used.
The defoaming agent is one or more of an organic silicon defoaming agent and a polyether defoaming agent. Preferably, german mingle chemical P803 silicone antifoam is used.
The rust inhibitor is one or more of nitrite rust inhibitor, amino alcohol rust inhibitor and amino carboxylic acid rust inhibitor.
The water-retaining agent is one or more of methylcellulose with viscosity lower than 4000 Pa.s, hydroxypropyl methylcellulose ether, hydroxyethyl methylcellulose and polyethylene glycol.
The redispersible latex powder is anti-saponification redispersible vinyl acetate/ethylene copolymer rubber powder;
the rheological stabilizer is a CSH nano particle.
The antifreezing agent is one or more of sodium nitrate, sodium nitrite and sodium thiocyanate; to reduce the water sensitivity of the mortar.
According to the invention, the raw materials are put into a gravity-free mixing stirrer according to the proportion and are mixed for 6-15min to obtain the sleeve grouting material for connecting the reinforcing steel bars in winter construction.
In the invention, the dry powder ultralow-temperature grouting material and water are uniformly stirred according to the total amount ratio of 0.11-0.13 to obtain the ultralow-temperature grouting material for construction, and more preferably, the water-material ratio is 0.12.
The invention has the beneficial effects that: the method is suitable for grouting connection of the ribbed steel bar sleeve in the environment of-10 to 10 ℃. The material still has good hydration characteristic under the low-temperature condition of winter assembly type construction, and can meet the related performance index requirements in the industrial standard JG/T408 sleeve grouting material for reinforcing steel bar connection only by conventional maintenance without auxiliary heat. Under the condition of low temperature, the unique double-expansion system of plastic gas generation and expansion after hardening ensures the fullness degree in a plastic state and the compensation of shrinkage in a hardening state. The initial fluidity is more than 300mm at minus 10 ℃ and 8 ℃, the fluidity is more than 260mm in 30min, and the paint does not delaminate and bleed, and has good constructability. The content of chloride ions is low, and the corrosion effect on the steel bar is greatly reduced. The early strength is high, and the 1d strength is more than 35 MPa; the later strength is high, the 28d strength is more than 85MPa, and the later shrinkage is avoided.
Detailed Description
In order that the invention may be more fully understood, reference will now be made to the following description. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Example 1
The sleeve grouting material for connecting the steel bars in winter construction in the embodiment comprises the following substances in parts by weight:
35 parts of P. O52.5R ordinary portland cement, 9 parts of high-alumina cement, 5 parts of microbead fly ash, 34 parts of 20-40 mesh carborundum, 6 parts of 40-70 mesh carborundum, 3 parts of 70-140 mesh carborundum, 5 parts of anhydrous gypsum, 0.01 part of tartaric acid, 0.01 part of sodium gluconate, 0.1 part of lithium carbonate, 3 parts of ettringite expanding agent, 0.02 part of azodicarbonamide, 0.28 part of Pasteur F10 water reducing agent, 0.05 part of a chemical P803 foam killer of Ming Ling, 0.04 part of nitrite rust inhibitor, 0.035 part of hydroxypropyl methyl cellulose ether, 0.2 part of anti-saponification redispersible vinyl acetate/ethylene copolymer powder, 0.1 part of CSH nano particles and 0.4 part of sodium nitrite.
Uniformly mixing the materials, placing the mixture in an environment of 8 ℃ for 24 hours, and stirring the mixture by using water at 8 ℃ to obtain the fluidity with the water-material ratio of 0.12 in the environment of 8 ℃; placing the mixture in an environment with the temperature of-10 ℃ for 24 hours, stirring the mixture by adopting an ice-water mixture with the temperature of 0 ℃ in a limit environment with the temperature of-10 ℃ according to the water-material ratio of 0.12, and measuring other indexes as follows:
meet the requirements of performance indexes.
The mixture is added into a gravity-free stirrer in proportion and stirred, and then is used in a construction environment at the temperature of-10 ℃ to 10 ℃, auxiliary heating is not needed, and construction requirements are met.
Example 2
The sleeve grouting material for connecting the steel bars in winter construction in the embodiment comprises the following substances in parts by weight:
20 parts of P. O52.5R ordinary Portland cement, 15 parts of quick-hardening sulphoaluminate cement, high-alumina cement, 10 parts of triple superphosphate ultrafine powder, 35 parts of 20-40 mesh washing, drying and screening river sand, 5 parts of 40-70 mesh washing, drying and screening river sand, 2 parts of 70-140 mesh river sand, 4 parts of anhydrous gypsum, 0.025 part of tartaric acid, 0.15 part of lithium carbonate, 4 parts of quick lime type expanding agent, 0.025 part of azodicarbonamide, 0.31 part of nicard 325C water reducing agent, 0.05 part of Mingling chemical P803 antifoaming agent, 0.05 part of amino alcohol rust inhibitor, 0.03 part of hydroxypropyl methyl cellulose ether, 0.15 part of anti-saponification redispersible vinyl acetate/ethylene copolymerized rubber powder, 0.1 part of CSH nano particles and 0.35 part of sodium nitrate.
Uniformly mixing the materials, placing the mixture in an environment of 8 ℃ for 24 hours, and stirring the mixture by using water at 8 ℃ to obtain the fluidity with the water-material ratio of 0.12 in the environment of 8 ℃; placing the mixture in an environment with the temperature of-10 ℃ for 24 hours, stirring the mixture by adopting an ice-water mixture with the temperature of 0 ℃ in a limit environment with the temperature of-10 ℃ according to the water-material ratio of 0.12, and measuring other indexes as follows:
meet the requirements of performance indexes.
The mixture is added into a gravity-free stirrer in proportion and stirred, and then is used in a construction environment at the temperature of-10 to 10 ℃, auxiliary heating is not needed, and construction requirements are met.
Example 3
The sleeve grouting material for connecting the steel bars in winter construction in the embodiment comprises the following substances in parts by weight:
35 parts of P & O52.5R ordinary Portland cement, 15 parts of quick-hardening sulphoaluminate cement, 5 parts of silica fume, 35 parts of 20-40 mesh machine-made sand, 7 parts of 40-70 mesh machine-made sand, 0.02 part of tartaric acid, 0.15 part of lithium carbonate, 3 parts of ettringite expanding agent, 0.025 part of azodicarbonamide, 0.27 part of Pasteur melamine water reducing agent, 0.05 part of Mirabilism chemical P803 antifoaming agent, 0.05 part of amino alcohol rust inhibitor, 0.035 part of hydroxypropyl methyl cellulose ether, 0.1 part of anti-saponification redispersible vinyl acetate/ethylene copolymer powder, 0.1 part of CSH nano particles and 0.45 part of sodium nitrate.
Uniformly mixing the materials, placing the mixture in an environment of 8 ℃ for 24 hours, and stirring the mixture by using water at 8 ℃ to obtain the fluidity with the water-material ratio of 0.12 in the environment of 8 ℃; placing the mixture in an environment with the temperature of-10 ℃ for 24 hours, stirring the mixture by adopting an ice-water mixture with the temperature of 0 ℃ in a limit environment with the temperature of-10 ℃ according to the water-material ratio of 0.12, and measuring other indexes as follows:
meet the requirements of performance indexes.
The mixture is added into a gravity-free stirrer in proportion and stirred, and then is used in a construction environment at the temperature of-10 ℃ to 10 ℃, auxiliary heating is not needed, and construction requirements are met.
The ultralow temperature grouting material provided by the invention is mixed with water to meet the performance index requirements shown in the following table.
The-10 ℃ conditions shown in the above table are measured by placing the raw materials and the apparatus in an environment of-10 ℃ for 24 hours and then stirring with an ice-water mixture at 0 ℃; the 8 ℃ condition is measured by placing the raw materials and the apparatus in an environment of 8 ℃ for 24 hours and then stirring with water of 8 ℃.
The-1 d indicated in the above table represents curing at low temperature 1d, -3d represents curing at low temperature 3d, -7+21d represents curing at low temperature 7d for the trans-standard curing 21 d.
Other criteria shown in the above table refer to the relevant provisions in the industry standard JG/T408 "sleeve grouting material for reinforcing bar connection".
The test pieces shown in the above table were formed using a triple test die made of steel of 40mm × 40mm × 160 mm.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (2)
1. The sleeve grouting material for connecting the reinforcing steel bars in winter construction is characterized by comprising the following components in parts by weight: 35 parts of P. O52.5R ordinary portland cement, 9 parts of high-alumina cement, 5 parts of microbead fly ash, 34 parts of 20-40 mesh carborundum, 6 parts of 40-70 mesh carborundum, 3 parts of 70-140 mesh carborundum, 5 parts of anhydrous gypsum, 0.01 part of tartaric acid, 0.01 part of sodium gluconate, 0.1 part of lithium carbonate, 3 parts of ettringite expanding agent, 0.02 part of azodicarbonamide, 0.28 part of Pasteur F10 water reducing agent, 0.05 part of a chemical P803 foam killer of Ming Ling, 0.04 part of nitrite rust inhibitor, 0.035 part of hydroxypropyl methyl cellulose ether, 0.2 part of anti-saponification redispersible vinyl acetate/ethylene copolymer powder, 0.1 part of CSH nano particles and 0.4 part of sodium nitrite.
2. A method for preparing sleeve grouting material for connecting reinforcing steel bars in winter construction is characterized in that the material of claim 1 is uniformly mixed, placed in an environment of 8 ℃ for 24 hours, and then stirred by water of 8 ℃ at the temperature of 8 ℃ to measure the fluidity with the water-material ratio of 0.12; placing at-10 deg.C for 24h, and stirring with 0.12 water-material ratio in-10 deg.C limit environment with 0 deg.C ice-water mixture.
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| CN113735523A (en) * | 2021-09-23 | 2021-12-03 | 重庆三圣实业股份有限公司 | Grouting material and preparation method thereof |
| CN113735487A (en) * | 2021-09-23 | 2021-12-03 | 重庆三圣实业股份有限公司 | Grouting agent and preparation method thereof |
| CN114133202A (en) * | 2021-12-07 | 2022-03-04 | 上海宝冶工程技术有限公司 | Low-temperature sleeve grouting material for connecting reinforcing steel bars |
| CN116409963A (en) * | 2021-12-29 | 2023-07-11 | 中国石油天然气集团有限公司 | Early strength cement for well cementation in extremely high and cold areas and preparation method thereof |
| CN114573308A (en) * | 2022-04-01 | 2022-06-03 | 北京市建筑工程研究院有限责任公司 | Seat slurry for installation and construction of wind power steel-concrete tower |
| JP7305141B1 (en) | 2022-10-13 | 2023-07-10 | 黒沢建設株式会社 | Construction method of cement paste and PC grout for winter |
| CN115872719A (en) * | 2022-12-27 | 2023-03-31 | 中冶武汉冶金建筑研究院有限公司 | Low-temperature sleeve grouting material for connecting reinforcing steel bars and preparation method thereof |
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| US9340458B2 (en) * | 2013-05-30 | 2016-05-17 | Laticrete International, Inc. | Premixed hybrid grout |
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