CN112174617A - Sleeve grouting material for connecting reinforcing steel bars and preparation method and application thereof - Google Patents
Sleeve grouting material for connecting reinforcing steel bars and preparation method and application thereof Download PDFInfo
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- CN112174617A CN112174617A CN202010989158.1A CN202010989158A CN112174617A CN 112174617 A CN112174617 A CN 112174617A CN 202010989158 A CN202010989158 A CN 202010989158A CN 112174617 A CN112174617 A CN 112174617A
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
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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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
Abstract
The invention provides a sleeve grouting material for connecting steel bars and a preparation method and application thereof, wherein the grouting material consists of A, B two components, wherein the component A is dry powder and comprises 400-600 parts by mass of cement, 10-40 parts by mass of mineral admixture, 400-600 parts by mass of sand, 0.2-3.0 parts by mass of plastic expanding agent, 15-25 parts by mass of expanding agent, 1-3 parts by mass of water reducing agent, 0.2-1.0 part by mass of defoaming agent, 0.1-1.0 part by mass of stabilizing agent, 0-10 parts by mass of antifreezing agent, 0-5 parts by mass of early strength agent and 0-5 parts by mass of retarder; the component B is 120-170 parts of water in parts by mass. The grouting material has the characteristics of high fluidity, micro expansion, high strength and the like, and can be applied to construction at different temperatures, namely low temperature (-5-10 ℃) and normal temperature (>10 ℃).
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a sleeve grouting material with high fluidity, micro-expansion and high strength, and a preparation method and application thereof.
Background
The prefabricated building mode improves the performance through the prefabrication and the maintenance of a factory, and meanwhile, the wet operation of a construction site can be greatly reduced, so that the environment is protected, and the waste of site materials can be reduced to a certain degree. The transverse connection of the prefabricated building is realized by adopting a site connection mode of reserving transverse ribs for components, and the longitudinal connection is realized as follows: the ribbed steel bars are inserted into the high-strength iron sleeves pre-buried in the concrete, the high-performance grouting material is used for filling gaps between the sleeves and the steel bars, and the grouting material is tightly meshed with the constant ribs of the steel bars and the grooves or the convex ribs on the inner walls of the sleeves after being hardened, so that the connection of the upper steel bar and the lower steel bar is realized. In the prefabricated building structure of assembled, the grout material of high performance is the key of realizing vertical connection, and its performance is good and bad plays crucial effect to guaranteeing structural system's wholeness and anti-seismic performance.
The grouting material can exist in a liquid state, and is convenient to inject the inner spaces such as cracks, fissures and pores of corresponding media by utilizing hydraulic pressure, air pressure and the like. The adhesive has the cementing and curing capability, so that a leakage channel of a medium is blocked, and the physical property and the mechanical property are improved.
However, the sleeve grouting materials in the prior art have shortcomings. For example, the existing sleeve grouting material has the defects of numerous components, high cost and complex operation in use. And depending on the ambient temperature, the grouting material often needs to be used in low-temperature and even negative-temperature environments, and the current grouting material often does not refer to the grouting material use technology and results at low temperature and negative temperature. In addition, the currently adopted cement-based grouting material also has the problems of insufficient fluidity, poor crack resistance, insufficient strength and the like, and is easy to shrink so as to influence the engineering quality.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a sleeve grouting material for connecting reinforcing steel bars, and a preparation method and application thereof. The grouting material has the characteristics of high fluidity, micro-expansion, high strength and the like, and is suitable for connecting prefabricated members such as prefabricated buildings, prefabricated bridges and the like with on-site components.
The invention adopts the following technical scheme:
on one hand, the invention provides a sleeve grouting material for connecting steel bars, which comprises A, B two components, wherein the component A is a dry powder material and comprises 400-600 parts by mass of cement, 10-40 parts by mass of a mineral admixture, 400-600 parts by mass of sand, 0.2-3.0 parts by mass of a plastic expanding agent, 15-25 parts by mass of an ettringite expanding agent, 1-3 parts by mass of a water reducing agent, 0.2-1.0 part by mass of a defoaming agent, 0.1-1.0 part by mass of a stabilizer, 0-10 parts by mass of an antifreezing agent, 0-5 parts by mass of an early strength agent and 0-5 parts by mass of a retarder; the component B is 120-170 parts of water in parts by mass.
Preferably, in the sleeve grout of the present invention: the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent, 0.3-0.4 part of stabilizing agent, 0-3 parts of antifreezing agent, 0-5 parts of early strength agent and 0-4 parts of retarder;
preferably, in the sleeve grout of the present invention: the component B is 130-150 parts of water by mass.
The sleeve grouting material for connecting the steel bars provided by the invention depends on the composition, and can be suitable for construction at different temperatures, namely low temperature (-5-10 ℃) and normal temperature (>10 ℃).
Preferably, the sleeve grouting material for connecting the steel bars is constructed at a low temperature (-5-10 ℃), and the grouting material comprises the following components in percentage by weight: the component A comprises 400-600 parts of cement, 10-40 parts of mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of plastic expanding agent, 15-25 parts of ettringite expanding agent, 1-3 parts of water reducing agent, 0.2-1.0 part of defoaming agent, 0.1-1.0 part of stabilizing agent, 2-10 parts of antifreezing agent, 2-5 parts of early strength agent and 2-5 parts of retarder; the component B is 120-170 parts of water in parts by mass. Further preferably, the proportion of the sleeve grouting material is as follows: the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent, 0.3-0.4 part of stabilizing agent, 2-3 parts of antifreezing agent, 4-5 parts of early strength agent and 3-4 parts of retarder; the component B is 130-150 parts of water by mass.
Or preferably, the sleeve grouting material for connecting the steel bars is constructed at normal temperature (>10 ℃), and the proportion of the grouting material is as follows: the component A comprises 400-600 parts of cement, 10-40 parts of mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of plastic expanding agent, 15-25 parts of ettringite expanding agent, 1-3 parts of water reducing agent, 0.2-1.0 part of defoaming agent and 0.1-1.0 part of stabilizing agent, and does not comprise antifreezing agent, early strength agent and retarder; the component B is 120-170 parts of water in parts by mass. Further preferably, the proportion of the sleeve grouting material is as follows: the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent and 0.3-0.4 part of stabilizing agent, and does not comprise antifreezing agent, early strength agent and retarder; the component B is 130-150 parts of water by mass.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the cement is one or more selected from 42.5 or above grade quick-hardening sulphoaluminate cement, 52.5 or above grade ordinary portland cement, 52.5 or above grade portland cement and high-alumina cement; more preferably, the cement is one or more selected from the group consisting of 42.5 and above grade rapid hardening sulphoaluminate cement, 52.5 and above grade ordinary portland cement and 52.5 and above grade portland cement.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the mineral admixture is one or more selected from fly ash, slag powder and silica fume.
Preferably, the fly ash is class II fly ash.
Wherein, the grain diameter of the slag powder is preferably less than 15 μm, the bulk density is 900-1200 kg/m3, and the specific surface area is 800-1000 m 2/kg.
Wherein, the particle size of the silica fume is preferably less than 0.2 μm, the bulk density is 500-800 kg/m3, and the specific surface area is 16000-20000 m 2/kg.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the sand is one or more selected from river sand, sea sand, mountain sand and machine-made sand.
Preferably, the sand is machine-made sand, more preferably is prepared by compounding machine-made sand of 20 meshes to 40 meshes, more than 40 meshes to 70 meshes and more than 70 meshes to 140 meshes, and further preferably is prepared by mixing machine-made sand of 20 meshes to 40 meshes, more than 40 meshes to 70 meshes and more than 70 meshes to 140 meshes with the weight ratio of (15-25): (40-60): (25-35) by mass ratio.
Wherein, preferably, the sand has a particle size of less than 2.36mm and a content of mud or stone dust of less than 1% by weight.
In the sleeve grout for reinforcing bar connection provided by the present invention, preferably, the plastic expanding agent is an inorganic component capable of generating an inert gas such as nitrogen.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, the water reducing agent is preferably one or more selected from naphthalene and polycarboxylic acid powder water reducing agents.
In the sleeve grouting material for connecting the steel bars, the defoaming agent is preferably one or more selected from organic phosphate, organic silicon resin, modified organic silicon resin and silicon dioxide and organic silicon resin complex defoaming agent.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the stabilizer is one or more selected from hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether and methyl cellulose ether. More preferably, the stabilizer is hydroxypropyl methyl cellulose ether with the viscosity of 50000-100000 mPa & s.
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the antifreeze is one or more selected from antifreeze of polyols, calcium formate and nitrites (such as calcium nitrite).
In the sleeve grouting material for connecting reinforcing steel bars provided by the invention, preferably, the early strength agent is one or more selected from lithium carbonate, sodium sulfate and aluminum sulfate.
In the sleeve grouting material for connecting the steel bars provided by the invention, preferably, the retarder is one or more selected from tartaric acid, boric acid, borax, sodium gluconate and citric acid. More preferably, the retarder is boric acid and/or borax.
On the other hand, the invention provides a preparation method of the sleeve grouting material for connecting the steel bars, which comprises the following steps:
A. adding the component A into a mortar mixer, and selecting a low-speed gear of the mortar mixer to carry out low-speed mixing;
B. adding the component B while stirring, and then continuously stirring at a low speed for 3-6 min, preferably 4min until the mortar is uniform;
C. stopping stirring, and standing for 1-2 min.
On the other hand, the invention provides a using method of the sleeve grouting material for connecting the steel bars, which adopts a grouting method and comprises the following steps:
A. testing the temperature of grouting environment;
B. after the prefabricated part is installed in place, fixing the prefabricated part to keep the prefabricated part stable;
C. wetting a grouting operation surface, a grouting pump, a grouting barrel, a grouting pipe, a stirrer blade and a stirring barrel by using water;
D. adding the component A into a mortar stirrer, selecting a low-speed gear of the mortar stirrer to stir at a low speed, adding the component B while stirring, and then continuously stirring for 3-6 min, preferably 4min until the mortar is uniform;
E. stopping stirring, and standing for 1-2 min;
F. adding the stirred grouting material into grouting equipment for grouting, wherein the operation time is 30 min;
G. grouting material is poured in from the grouting opening, flows out from the grout outlet, and meanwhile, a test piece is manufactured;
H. plugging a grout outlet, maintaining the pressure for 0.1MPa for 0.5min, plugging a grout filling port and completing grouting.
In the step A, the corresponding sleeve grouting material for connecting the reinforcing steel bars can be selected by testing whether the grouting environment temperature is low temperature (-5-10 ℃) or normal temperature (>10 ℃).
Compared with the prior art, the invention has the following beneficial effects:
(1) the applicable raw materials are common, the cost is low, and the cost of the sleeve grouting material can be reduced to a certain extent.
(2) In the sleeve grouting material for connecting the reinforcing steel bars, cement and mineral admixture are composite gel components, sand and mineral admixture are aggregates with the fineness matched with each other, the mineral admixture improves the fluidity of mortar, reduces bleeding segregation and the like, improves the strength, the compactness and the like, and can save certain cost; and the sand is selected from one or more of river sand, sea sand, mountain sand and machine-made sand, and is particularly obtained by compounding machine-made sand of 20-40 meshes, > 40-70 meshes and > 70-140 meshes according to a certain proportion, and the grading is optimized, so that the comprehensive performance of the grouting material is more excellent.
(3) The sleeve grouting material for connecting the steel bars uses specific amounts of plastic expanding agent and ettringite expanding agent, inhibits the shrinkage generated in the cement hydration process in the plastic stage and the later stage respectively, and ensures that the grouting material has certain micro-expansibility, thereby increasing the contact between the sleeve and the grouting material and improving the quality of engineering. Specifically, the plastic expanding agent forms tiny bubbles in a system through inert gas generated by reaction before curing, so that micro-expansion in a plastic stage is guaranteed; and the ettringite series expanding agent compensates the shrinkage of the mortar through later-stage volume micro-expansion, so that the mortar does not shrink or even has a micro-expansion effect in the later stage, and the close adhesion of the mortar and the sleeve is ensured.
(4) A certain amount of water reducing agent, defoaming agent and stabilizing agent are added into the sleeve grouting material for connecting the reinforcing steel bars. The water reducing agent can enable the mortar to reach large fluidity under a low water-cement ratio, and can effectively reduce fluidity loss. The defoaming agent eliminates bubbles inside and on the surface, thereby obtaining a compact and high-quality surface. The stabilizer overcomes the evaporation of water in the self-leveling mortar and the water absorption of the base layer, and is beneficial to prolonging the opening time; meanwhile, segregation and sedimentation are prevented through the thickening effect, and a more uniform structure is formed, so that the bonding strength is improved, and a smooth and fine surface is formed; in addition, the stabilizing agent can improve the water retention of the mortar, and water absorbed in the initial stage is gradually hydrated along with cement, so that certain water is supplemented to the mortar in the later stage.
The components have synergistic effect, so that the mortar disclosed by the invention has a compact structure, no surface cracks and excellent waterproofness and comprehensive performance.
In addition to the above effects, the cement-based grouting material of the invention has excellent fluidity and can be self-compacted; by adding a small amount of admixture, the structure is more compact, and the compressive strength of the grouting material is greatly improved. And the construction at low temperature (-5-10 ℃) is realized by adjusting the proportion of the raw materials and adding an antifreezing agent, an early strength agent and a retarder. Under the condition of normal temperature (10 ℃), the proportion of the grouting material does not need to be adjusted, and the adaptability is strong.
In addition, the performance test of the grouting material completely meets the technical requirements in JG/T408-2019 sleeve grouting material for steel bar connection, JGJ355 steel bar sleeve grouting application technical specification and JGJ107-2016 steel bar mechanical connection technical specification, and the unidirectional tension, high-stress repeated tension and compression and large-deformation repeated tension and compression of the grouting joint completely meet the indexes.
Detailed Description
The invention is illustrated below with reference to specific examples. It will be understood by those skilled in the art that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention in any way.
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials and reagent materials used in the following examples are all commercially available products unless otherwise specified.
Hydroxypropyl methylcellulose ether having a viscosity of 50000 to 100000 mPas: huizhou city Huasheng Source New materials, Inc.;
grade II fly ash: gansu bocheng microsilica limited;
the slag powder has the particle size of less than 15 mu m, the bulk density of 900-1200 kg/m3, and the specific surface area of 800-1000 m 2/kg: gansu bocheng microsilica limited;
the particle size of the silica fume is less than 0.2 mu m, the bulk density is 500-800 kg/m3, and the specific surface area is 16000-20000 m 2/kg: gansu bocheng microsilica limited;
ettringite-based expanding agent: tang shan polar bear building materials ltd;
plastic swelling agent: tangshan polar bear building materials Co.
Example 1
The composition of the sleeve grouting material for reinforcing bar connection of the present embodiment is shown in table 1.
The preparation method comprises the following steps:
A. adding the component A into a mortar stirrer, starting the stirrer, and selecting a low-speed gear of the mortar stirrer to stir at a low speed;
B. adding the component B, stirring and adding, and then stirring at low speed for 4 min;
C. stopping stirring, and standing for 1 min.
The construction method comprises the following steps:
the method adopts a mud jacking method and comprises the following steps:
A. testing the temperature of grouting environment;
B. after the prefabricated part is installed in place, taking a temporary fixing measure for ensuring the stability of the part;
C. wetting a grouting operation surface, a grouting pump, a grouting barrel, a grouting pipe, a stirrer blade and a stirring barrel by using water;
D. adding accurately weighed component A into a mortar stirrer, starting the stirrer, selecting a low-speed gear of the mortar stirrer to stir at a low speed, then adding component B into the stirrer while stirring, and then stirring at a low speed for 4 min;
E. standing for 1min after stirring, and testing the fluidity for 30min after sample retention;
F. adding the stirred grouting material into grouting equipment for grouting, wherein the operation time is 30 min;
G. then, grouting material is poured in from a grouting opening, and flows out from a grout outlet, and meanwhile, a test piece is manufactured;
H. plugging a grout outlet, maintaining the pressure for 0.1MPa for 0.5min, plugging a grout filling port and completing grouting.
Examples 2 to 5
The compositions of the reinforcing bar connecting sleeve grouting materials of examples 2 to 5 are shown in table 1. Examples 2-5 were obtained according to the same preparation method and application process as in example 1.
Comparative examples 1 to 5
The raw material composition of the mortar of comparative example 1 is shown in table 2. The preparation and use of comparative examples 1-5 are identical to examples 1-3.
TABLE 1 mortar raw material formulation of each example (1 part ═ 1g)
TABLE 2 mortar raw material ratio of each proportion (1 g ═ 1 part)
Test exampleMortar Property measurement of examples and comparative examples
The performance of the mortars prepared in examples 1 to 5 and comparative examples 1 to 5 was measured by referring to the method of JG/T408-2019 Sleeve grouting Material for Steel Bar connection, and the measurement results are shown in tables 3 and 4.
TABLE 3 mortar Properties of the examples and comparative examples
TABLE 4 mortar Properties of the examples and comparative examples
As can be seen from the data in table 2: compared with the comparative example, the embodiment of the invention has the advantages that the fly ash, the slag powder and the silica fume are compounded and used on the raw material composition, the specific amount of the plastic expanding agent and the ettringite expanding agent are compounded and used, the change of the 30-min fluidity and the initial fluidity of the prepared mortar is very small, but the compressive strength is obviously higher than the comparative example, which shows that the mortar of the invention has large fluidity, and the plumpness can be realized after the grouting. In addition, compared with the comparative example, the 28d compressive strength of the example is higher than that of the comparative example, the 28d shrinkage rate is smaller, and the loss rate of the anti-freezing property is smaller than that of the comparative example. The comparative example is clearly inferior to the grouting material of the invention in terms of mechanical properties and durability.
The grouting material can be suitable for construction at different temperatures, the quick-hardening sulphoaluminate cement and the common Portland cement are used in a composite mode, the proportions at low temperature and normal temperature are different, and the construction requirements of different working conditions on site are met.
The above description of the specific embodiments of the present invention is not intended to limit the present invention, and those skilled in the art may make various changes and modifications according to the present invention without departing from the spirit of the present invention, which is defined by the scope of the appended claims.
Claims (11)
1. A sleeve grouting material for connecting steel bars comprises A, B two components, wherein the component A is a dry powder material and comprises, by mass, 400-600 parts of cement, 10-40 parts of a mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of a plastic expanding agent, 15-25 parts of an ettringite expanding agent, 1-3 parts of a water reducing agent, 0.2-1.0 part of a defoaming agent, 0.1-1.0 part of a stabilizer, 0-10 parts of an antifreezing agent, 0-5 parts of an early strength admixture and 0-5 parts of a retarder; the component B is 120-170 parts of water in parts by mass.
2. The sleeve grouting material of claim 1, wherein the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent, 0.3-0.4 part of stabilizer, 0-3 parts of antifreezing agent, 0-5 parts of early strength agent and 0-4 parts of retarder;
preferably, the component B is 130-150 parts by weight of water.
3. The sleeve grouting material according to claim 1 or 2, wherein the component A comprises, by mass, 400-600 parts of cement, 10-40 parts of a mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of a plastic expanding agent, 15-25 parts of an ettringite expanding agent, 1-3 parts of a water reducing agent, 0.2-1.0 part of an antifoaming agent, 0.1-1.0 part of a stabilizer, 2-10 parts of an antifreezing agent, 2-5 parts of an early strength agent and 2-5 parts of a retarder; the component B is 120-170 parts of water by mass;
preferably, the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent, 0.3-0.4 part of stabilizing agent, 2-3 parts of antifreezing agent, 4-5 parts of early strength agent and 3-4 parts of retarder; the component B is 130-150 parts of water by mass.
4. The sleeve grouting material according to claim 1 or 2, wherein the component A comprises, by mass, 400-600 parts of cement, 10-40 parts of a mineral admixture, 400-600 parts of sand, 0.2-3.0 parts of a plastic expanding agent, 15-25 parts of an ettringite expanding agent, 1-3 parts of a water reducing agent, 0.2-1.0 part of an antifoaming agent, and 0.1-1.0 part of a stabilizer, and does not comprise an antifreezing agent, an early strength agent and a retarder; the component B is 120-170 parts of water by mass;
preferably, the component A comprises 500-550 parts of cement, 25-30 parts of mineral admixture, 450-550 parts of sand, 0.8-1.5 parts of plastic expanding agent, 18-23 parts of ettringite expanding agent, 2-2.5 parts of water reducing agent, 0.4-0.6 part of defoaming agent and 0.3-0.4 part of stabilizing agent, and does not contain antifreezing agent, early strength agent and retarder; the component B is 130-150 parts of water by mass.
5. The sleeve grouting material according to any one of claims 1 to 4, wherein the cement is one or more selected from the group consisting of rapid hardening sulphoaluminate cement of 42.5 and above grade, ordinary portland cement of 52.5 and above grade, and high alumina cement;
preferably, the cement is one or more selected from the group consisting of 42.5 and above grade rapid hardening sulphoaluminate cement, 52.5 and above grade ordinary portland cement and 52.5 and above grade portland cement.
6. The sleeve grout material as claimed in any one of claims 1 to 5, wherein said mineral admixture is one or more selected from fly ash, slag powder and silica fume;
preferably, the fly ash is class II fly ash;
preferably, the grain diameter of the slag powder is less than 15 mu m, and the bulk density is 900-1200 kg/m3The specific surface area is 800-1000 m2/kg；
Preferably, the particle size of the silica fume is less than 0.2 mu m, and the bulk density is 500-800 kg/m3The specific surface area is 16000-20000 m2/kg。
7. The sleeve grout material according to any one of claims 1 to 6, wherein said sand is one or more selected from river sand, sea sand, mountain sand and machine-made sand;
preferably, the sand is machine-made sand, more preferably is prepared by compounding machine-made sand of 20 meshes to 40 meshes, more than 40 meshes to 70 meshes and more than 70 meshes to 140 meshes, and further preferably is prepared by mixing machine-made sand of 20 meshes to 40 meshes, more than 40 meshes to 70 meshes and more than 70 meshes to 140 meshes with the weight ratio of (15-25): (40-60): (25-35) compounding in a mass ratio;
preferably, the sand has a particle size of less than 2.36mm and a mud content or stone dust content of less than 1% by weight.
8. The sleeve grout material according to any one of claims 1 to 7, wherein said plastic swelling agent is an inorganic component capable of generating an inert gas such as nitrogen;
preferably, the water reducing agent is one or more selected from naphthalene and polycarboxylic acid powder water reducing agents;
preferably, the defoaming agent is one or more selected from powdery organic phosphate, organic silicon resin, modified organic silicon resin and silicon dioxide and organic silicon resin complex defoaming agent.
9. The sleeve grout material of any one of claims 1 to 8, wherein said stabilizer is one or more selected from the group consisting of hydroxypropyl methyl cellulose ether, hydroxyethyl methyl cellulose ether, methyl cellulose ether; preferably, the stabilizer is hydroxypropyl methyl cellulose ether with the viscosity of 50000-100000 mPa & s;
preferably, the antifreeze is one or more selected from the group consisting of polyols, calcium formate and nitrite based (e.g. calcium nitrite) antifreeze;
preferably, the early strength agent is one or more selected from lithium carbonate, sodium sulfate and aluminum sulfate;
preferably, the retarder is one or more selected from tartaric acid, boric acid, borax, sodium gluconate and citric acid, and more preferably boric acid and/or borax.
10. The method for preparing a sleeve grout for reinforcing steel bar connection according to any one of claims 1 to 9, comprising the steps of:
A. adding the component A into a mortar mixer, and selecting a low-speed gear of the mortar mixer to carry out low-speed mixing;
B. adding the component B while stirring, and then continuously stirring at a low speed for 3-6 min, preferably 4 min;
C. stopping stirring, and standing for 1-2 min.
11. The method for using a sleeve grout for reinforcing steel bar connection as claimed in any one of claims 1 to 9, comprising the steps of:
A. testing the temperature of grouting environment;
B. after the prefabricated part is installed in place, fixing the prefabricated part to keep the prefabricated part stable;
C. wetting a grouting operation surface, a grouting pump, a grouting barrel, a grouting pipe, a stirrer blade and a stirring barrel by using water;
D. adding the component A into a mortar stirrer, selecting a low-speed gear of the mortar stirrer to stir at a low speed, adding the component B while stirring, and then continuously stirring for 3-6 min, preferably 4 min;
E. stopping stirring, and standing for 1-2 min;
F. adding the stirred grouting material into grouting equipment for grouting, wherein the operation time is 30 min;
G. grouting material is poured in from the grouting opening, flows out from the grout outlet, and meanwhile, a test piece is manufactured;
H. plugging a grout outlet, maintaining the pressure for 0.1MPa for 0.5min, plugging a grout filling port and completing grouting.
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| CN113548855A (en) * | 2021-07-29 | 2021-10-26 | 上海申通地铁集团有限公司 | Cement-based grouting material and preparation method thereof |
| CN113582637A (en) * | 2021-08-03 | 2021-11-02 | 山东诺为新材料科技有限公司 | High-strength sleeve grouting material |
| CN114044663A (en) * | 2021-11-24 | 2022-02-15 | 燕山大学 | Low-shrinkage early-strength sleeve grouting material and preparation method and application thereof |
| CN114455925A (en) * | 2022-02-24 | 2022-05-10 | 中交路桥建设有限公司 | High-performance grouting material for connecting assembled bridge reinforcing steel bar sleeve and application method and application thereof |
| CN115385637A (en) * | 2021-05-25 | 2022-11-25 | 武汉塔牌华轩新材料科技有限公司 | Low-temperature super-early-strength sleeve grouting material for prefabricated building |
| CN115504735A (en) * | 2022-09-13 | 2022-12-23 | 长江师范学院 | Cement-based grouting material for steel bar sleeve |
| 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 |
| CN115872675A (en) * | 2022-11-10 | 2023-03-31 | 上海宝冶工程技术有限公司 | Sleeve grouting repair material for steel bar connection and preparation method thereof |
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