CN112125640B - Early-strength seat slurry suitable for prefabricated part connection and preparation method thereof - Google Patents
Early-strength seat slurry suitable for prefabricated part connection and preparation method thereof Download PDFInfo
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- CN112125640B CN112125640B CN202010983830.6A CN202010983830A CN112125640B CN 112125640 B CN112125640 B CN 112125640B CN 202010983830 A CN202010983830 A CN 202010983830A CN 112125640 B CN112125640 B CN 112125640B
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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
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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
- C04B2201/05—Materials having an early high strength, e.g. allowing fast demoulding or formless casting
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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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- 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 belongs to the technical field of building materials, and relates to early-strength seat slurry suitable for connecting prefabricated parts and a preparation method thereof. The material is prepared from dead burned MgO, monopotassium phosphate, fine settled beads, mineral powder, a retarder, a water reducing agent, a defoaming agent and sand. The base slurry provided by the invention has excellent material rheological property and micro-expansion, the 1d compressive strength can reach more than 45MPa, the 28d compressive strength can reach more than 65MPa, and the connection construction efficiency and the connection safety performance of the prefabricated part are effectively improved. Meanwhile, the mortar has stronger adhesive force with a member concrete interface, and the roughening process of the member contact interface can be reduced. The method has the characteristics of high construction efficiency, good rheological property, excellent structural compactness and the like when being applied to the connection of prefabricated parts.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to early-strength seat slurry suitable for connecting prefabricated parts and a preparation method thereof.
Background
The assembly type building has the advantages of energy conservation, land conservation, water conservation, material conservation and environmental protection, namely 'five sections and one environment protection', and accords with the development concepts of environment-friendly type and resource conservation type in China. The country and the place are actively promoting the development of the assembly type building, striving for about 10 years, make the assembly type building account for 30% of the newly-built building, the assembly type building has already been widely used in the industries such as building, water conservancy at present.
In recent years, the assembly type building has been widely regarded as one of the main directions of the national building industry due to the advantages of high construction speed, small environmental pollution, easy construction and the like. In the assembly type building construction, the grouting connection of the steel bar sleeve is an important link. Before this, can carry out the shutoff to the outer edge that prefabricated component connects and inside space in advance to avoid taking place to leak thick liquid at sleeve grout in-process, fill not closely knit scheduling problem. Therefore, the application of the seat slurry in the connection of the assembly type components is gradually developed, the seat slurry is a special seat slurry which takes cement as a cementing material, is matched with a composite additive and a high-strength aggregate, can be used after being stirred by adding water on site, has the characteristics of no shrinkage, high strength, easy shrinkage and the like, is suitable for various component seat slurries, has the 28d compressive strength of not less than 60MPa, is a key material for connecting the components in the assembly type building, directly determines the construction speed in the strength development, and is a very significant thing in the overall development of the assembly type building.
At present, researches on assembly type building seat slurry are few, common practice for gap connection of assembly type components is to use common cement mortar for plugging, obviously, the construction method is low in cost and good in material selection, but the construction method is long in setting time, low in early-stage strength, poor in workability and large in later-stage shrinkage, and the problems are not beneficial to field construction and development of later-stage processes. Through repeated exploration experiments, the magnesium phosphate cement is an ideal interface cementing material for seat slurry, the magnesium phosphate cement mainly comprises phosphate, magnesium oxide and an additive according to a certain proportion, and the cementing material has the characteristics of quick hardening, early strength, high bonding strength, small volume deformation, small wear resistance, wide environmental adaptability and the like, and has wide application prospects in the aspects of quick repair and reinforcement of engineering, solidification of harmful substances, national defense construction and the like.
Document CN 105800979B proposes a magnesium phosphate cement with good water resistance and a preparation method thereof. By adding desulfurized gypsum, fly ash, steel slag powder, limestone powder, water reducing agent and defoaming agent, on one hand, the filling and density can be achieved through the micro-aggregate effect of the fly ash and the limestone powderThe solid space effect is realized, on the other hand, the limestone powder can react with soluble phosphate in the matrix to generate CaHPO4So that the dissolved phosphate of the Magnesium Phosphate Cement (MPC) after being soaked in water is reduced. Document CN 103922694B proposes a magnesium phosphate cement-based composite material, in which portland cement and sulphoaluminate cement are added to magnesium phosphate cement, which is improved in water resistance and the setting time is prolonged. The magnesium phosphate cement has the characteristics of excellent rheological property, high early strength and the like, is matched with the performance requirement of the base slurry, and can effectively improve the construction efficiency and performance of connection. And the application of magnesium phosphate cement in the aspect of the base slurry is less reported. For example, document CN 106630871 a proposes a seat paste for filling gaps in a fabricated component and a method for preparing the same. The high-strength high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature-resistant high-temperature resistant high-temperature resistant high-. The performance of the magnesium phosphate cement is improved through the fibers, the rheological property of the slurry is obviously reduced through the fibers, the technical difficulty is increased, and meanwhile, the magnesium phosphate cement has obvious advantages in the aspect of interface bonding.
Disclosure of Invention
Based on the background and the material performance requirements, the invention provides the early strength seat slurry prepared by modifying the magnesium phosphate cement, and the early strength seat slurry can be used for connecting assembled components.
The scheme adopted by the invention for solving the technical problems is as follows:
the early-strength seat slurry suitable for connecting prefabricated parts comprises the following components in percentage by mass:
preferably, the dead-burned magnesia is prepared by calcining magnesite at 1600-1700 ℃, and then grinding the calcined magnesia into powder with the specific surface area of 240-280m2Kg, MgO content not less than 90%.
Preferably, the potassium dihydrogen phosphate is KH2PO4The content is not less than 96 percent, and the crystal grain size is 20/520-40/350 meshes/mu m.
Preferably, the fine precipitated beads are air separation ultrafine fly ash precipitated beads, and the median particle size is 1-3 μm.
Preferably, the mineral powder is a concrete admixture obtained by grinding slag, the calcium content is not less than 35%, and the specific surface area is not less than 600m2/kg。
Preferably, the retarder is borax and Na2B4O7·10H2The O content is not less than 95%.
Preferably, the water reducing agent is a dry powder polycarboxylic acid water reducing agent with the molecular weight of 2000-2400.
Preferably, the defoaming agent is polyether defoaming agent, and one or two of organic silicon defoaming agents are mixed in a ratio of 1: 1.
Preferably, the water is tap water, the sand is river sand, the maximum particle size is not more than 2.36mm, and the mud content is not more than 2%.
The invention also aims to provide a preparation method of the early strength seat slurry suitable for connecting the prefabricated parts, which comprises the steps of mixing the reburning magnesium oxide, the mineral powder, the retarder, the water reducing agent and the defoaming agent to prepare a material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for prefabricated component connection is obtained.
The invention has the following technical effects:
(1) the setting slurry material provided by the invention is based on magnesium phosphate cement modification design, and the hydration reaction process is controlled by controlling the particle size distribution of the main raw materials, so that the hydration product is optimized. Based on the fine bead-sinking effect and the reactivity characteristic, the initial rheological property and the 30min rheological property of the seat slurry can be improved. Through the synergistic strengthening effect of the mineral powder and the fine microspheres, the solubility of hydrate product crystals can be reduced, and the water resistance of the hydrate product crystals can be improved, so that the requirement on the performance of the base slurry can be met.
(2) The seat slurry provided by the invention has the characteristics of fast strength development (8h can reach 35MPa to meet the requirement of disturbance construction, and 1d strength can reach more than 45 MPa), strong cohesive force (28d can reach 8.0MPa), excellent structural compactness and the like, and has obvious advantages compared with the existing seat slurry.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
In each example:
the dead burned magnesia is prepared by calcining magnesite at 1600-1700 ℃ for 5h, and grinding the magnesite into powder with the specific surface area of 240-280m2Per Kg, the MgO content is not less than 90 percent; potassium dihydrogen phosphate KH2PO4The content is not less than 96 percent, and the crystal granularity is 20/520-40/350 meshes/mu m; the fine sinking beads are air separation superfine fly ash sinking beads, and the median particle size is 1-3 μm; the mineral powder is a concrete admixture obtained by grinding slag, the calcium content is not less than 35 percent, and the specific surface area is not less than 600m2Per kg; the retarder is borax and Na2B4O7·10H2The content of O is not less than 95 percent; the water reducing agent is a dry powder polycarboxylic acid water reducing agent with the molecular weight of 2000-2400; the defoaming agent is a polyether defoaming agent, and one or two of organic silicon defoaming agents are mixed in a ratio of 1: 1; the water is tap water, the sand is river sand, the maximum particle size is not more than 2.36mm, and the mud content is not more than 2%.
Example 1
A seat slurry suitable for connection of an assembly type component is prepared by mixing the following components in parts by mass:
grinding the reburning magnesium oxide, controlling the particle size distribution of the magnesium oxide, regulating and controlling the reaction speed, and mixing the reburning magnesium oxide, the mineral powder, the retarder, the water reducing agent and the defoaming agent to prepare a material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
Example 2
A seat slurry suitable for connection of an assembly type component is prepared by mixing the following components in parts by mass:
grinding the reburning magnesium oxide, controlling the particle size distribution of the magnesium oxide, regulating and controlling the reaction speed, and mixing the reburning magnesium oxide, the mineral powder, the retarder, the water reducing agent and the defoaming agent to prepare a material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
Example 3
A seat slurry suitable for connection of an assembly type component is prepared by mixing the following components in parts by mass:
grinding the reburning magnesium oxide, controlling the particle size distribution of the magnesium oxide, regulating and controlling the reaction speed, and mixing the reburning magnesium oxide, the mineral powder, the retarder, the water reducing agent and the defoaming agent to prepare a material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
Example 4
The existing base slurry is selected for testing performance and used as a comparative example:
grinding the reburning magnesia, controlling the particle size distribution of the magnesia, and mixing the reburning magnesia, mineral powder, retarder, water reducer and defoamer to prepare material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
Example 5
The existing base slurry is selected for testing performance and used as a comparative example:
comparative example 1
A seat slurry suitable for connection of an assembly type component is prepared by mixing the following components in parts by mass:
grinding the reburning magnesia, controlling the particle size distribution of the magnesia, and mixing the reburning magnesia, mineral powder, retarder, water reducer and defoamer to prepare material A; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
The performance index thereof is shown in the following table,
the water-resistant coefficient refers to the ratio of the strength of a hardened test block when the test block is maintained in a water-soaked environment for a certain period to the compressive strength of the test block when the test block is maintained in the same period at room temperature
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (6)
1. The early-strength seat slurry suitable for connecting prefabricated parts is characterized by comprising the following components in percentage by mass:
the dead-burned magnesia is prepared by calcining magnesite at 1600-1700 ℃, and then grinding the calcined magnesite to powder with the specific surface area of 240-280m2The MgO content is not less than 90 percent;
the potassium dihydrogen phosphate contains KH2PO4The content is not less than 96 percent, and the crystal granularity is 20/520-40/350 meshes/mu m;
the fine sinking beads are air separation ultrafine fly ash sinking beads, and the median particle size is 1-3 mu m;
the mineral powder is a concrete admixture obtained by grinding slag, the calcium content is not less than 35 percent, and the specific surface area is not less than 600m2/kg。
2. The early strength seat paste of claim 1 wherein the set retarder is borax, wherein Na2B4O7·10H2The O content is not less than 95%.
3. The early strength seat slurry as claimed in claim 1, wherein the water reducing agent is a dry powder polycarboxylic acid water reducing agent with molecular weight of 2000-2400.
4. The early strength seat paste of claim 1, wherein the defoamer is a polyether defoamer, either or both of silicone defoamers being mixed in a 1:1 ratio.
5. The early strength seat slurry of claim 1, wherein the water is tap water, the sand is river sand, the maximum particle size is no greater than 2.36mm, and the mud content is no greater than 2%.
6. The preparation method of the early strength seat slurry suitable for prefabricated part connection according to any one of claims 1 to 5, wherein the material A is prepared by mixing dead-burned magnesium oxide, mineral powder, a retarder, a water reducing agent and a defoaming agent; uniformly mixing potassium dihydrogen phosphate, fine settled beads and sand to obtain a material B; during construction, the material A and the material B are uniformly mixed, and water is added to be uniformly stirred, so that the early strength seat slurry suitable for connecting the prefabricated parts is obtained.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010983830.6A CN112125640B (en) | 2020-09-18 | 2020-09-18 | Early-strength seat slurry suitable for prefabricated part connection and preparation method thereof |
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| CN112125640B true CN112125640B (en) | 2022-04-08 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105272138B (en) * | 2015-10-10 | 2017-08-25 | 同济大学 | A kind of magnesium phosphate cement base fast repairing mortar and preparation method thereof |
| CN106630871B (en) * | 2016-12-08 | 2019-11-05 | 江苏苏博特新材料股份有限公司 | A kind of seat slurry and preparation method thereof for filling prefabricated member gap |
| CN108424065A (en) * | 2017-07-13 | 2018-08-21 | 上海城建建设实业集团新型建筑材料有限公司 | A kind of slurry and its preparation method and application |
| KR101952764B1 (en) * | 2018-05-15 | 2019-02-28 | 한국철도기술연구원 | Mortar composition for repairing, reinforcing and enhancing earthquake-proof property, and construction method of repair and reinforcement of concrete structure using the same |
| CN109516737B (en) * | 2018-12-10 | 2021-08-24 | 三一筑工科技股份有限公司 | Seat paste and preparation method and application thereof |
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