CN107915435B - Low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars - Google Patents

Low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars Download PDF

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CN107915435B
CN107915435B CN201711214603.1A CN201711214603A CN107915435B CN 107915435 B CN107915435 B CN 107915435B CN 201711214603 A CN201711214603 A CN 201711214603A CN 107915435 B CN107915435 B CN 107915435B
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grouting material
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CN107915435A (en
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李长成
刘立
贾福杰
赵顺增
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China Building Materials Academy CBMA
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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
    • C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
    • 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
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/00715—Uses not provided for elsewhere in C04B2111/00 for fixing bolts or the like
    • 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
    • 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
    • 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)
  • Ceramic Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
  • Reinforcement Elements For Buildings (AREA)

Abstract

The invention relates to a low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars, which comprises a solid base material and an exciting agent, wherein the solid base material comprises the following components in percentage by weight: steel slag: 10.0 to 15.0 percent; slag: 15.0 to 25.0 percent; fly ash: 10.0 to 15.0 percent; plastic swelling agent: 0.20-0.35%; low temperature sensitive self-stress modifier: 6.0 to 8.0 percent; defoaming agent: 0.05-0.08%; quartz sand: 40.0 to 50.0 percent. The invention ensures that the sleeve grouting material has low temperature sensitivity and can be normally used at 0-35 ℃, and solves the problems that the prior grouting material can not be constructed or the strength can not reach the standard due to overlarge fluidity loss caused by season exchange and temperature change. The grouting material can establish chemical self-stress under the conditions of absolute wet expansion, coordinated development of expansion and strength and strong constraint, remarkably improves the bond stress of the reinforcing steel bars, improves the connection reliability between components and eliminates potential safety hazards caused by volume contraction of the traditional grouting material.

Description

Low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars
Technical Field
The invention relates to a sleeve grouting material, in particular to a sleeve grouting material for connecting low-temperature-sensitive self-stress quick-hardening steel bars.
Background
The fabricated concrete building is a whole building which is formed by splitting and designing traditional building products into prefabricated reinforced concrete members which can be produced in factories, prefabricating, processing, hoisting and transporting the prefabricated reinforced concrete members to construction sites in factories and assembling the prefabricated reinforced concrete members. The node between the components is a force transmission pivot of the whole structure and is the weakest link of the whole structure. At present, the prefabricated concrete structure generally adopts a steel bar grouting sleeve connection technology, namely, a sleeve and a reserved steel bar are firmly bonded into a whole by grouting materials, and axial force is transmitted through the shear strength of the grouting materials in the sleeve. Therefore, the performance of the sleeve grouting material is the main guarantee of the reliability of the connection of the steel bar sleeve and is also the key point of the connection between the components, and the performance directly determines the safety and the durability of the structure.
At present, cement-based sleeve grouting materials used for assembly type buildings at home and abroad mainly comprise three major types, namely a portland cement system, a sulphoaluminate cement system and a composite system of portland cement and sulphoaluminate cement. The Portland cement system grouting material is simple to prepare and low in cost, but is slow in condensation, high in hydration heat and large in later-stage hardening shrinkage, and cannot be used when the temperature is low in winter. In the prior art, a plastic expanding agent and a concrete expanding agent are doped to solve volume shrinkage, but the effect is poor because: no expansion can occur in an adiabatic environment (ettringite-type expansion agents) or no rate mismatch between expansion and strength can establish effective expansion (calcia-type expansion agents). The sulphoaluminate cement system grouting material has the advantages of high setting speed, high early strength, micro-expansion and the like, but the setting speed is too high, the construction operable time is short, the loss of fluidity for 30min is too large to use when the temperature is high in summer, the production cost is higher, and the later strength is not high. The composite grouting material of the Portland cement and the sulphoaluminate cement has high early and later strength, but has complex components, frequently adjusted mixing proportion and poor stability, and the same strength and fluidity are sensitive to temperature.
Therefore, the prior sleeve grouting material production application also has the following problems: (1) the grouting material is particularly sensitive to temperature, the fluidity and the strength performance are greatly influenced by temperature change and construction seasons, the fluctuation is very large, the stability is poor, and normal construction cannot be realized; (2) effective expansion compensation shrinkage cannot be established in an absolute wet environment and in a constraint state, self shrinkage is large, volume stability is poor, grouting materials are separated from the sleeve, a 'peanut shell' structure is formed, and connection between components is influenced; (3) only the compressive strength is emphasized, the stress directions of the actual connecting parts are various, and the bond stress of the reinforcing steel bars is neglected; (4) the early strength is low, influences construction progress and efficiency.
Disclosure of Invention
The invention mainly aims to provide a novel low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars, and aims to solve the technical problems that the sleeve grouting material has low temperature sensitivity, can establish effective expansion compensation volume shrinkage under a moisture-proof condition, stores chemical self-stress to improve the bond strength of the steel bars, is early strong and quick, accelerates the construction progress, and is more practical.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme. The invention provides a low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars, which comprises a solid base material and an exciting agent, wherein the solid base material comprises the following components in percentage by weight:
steel slag: 10.0 to 15.0 percent;
slag: 15.0 to 25.0 percent;
fly ash: 10.0 to 15.0 percent;
plastic swelling agent: 0.20-0.35%;
low temperature sensitive self-stress modifier: 6.0 to 8.0 percent;
defoaming agent: 0.05-0.08%;
quartz sand: 40.0 to 50.0 percent.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
Preferably, the exciting agent is liquid water glass, the modulus is 1.2-1.8, and the exciting agent accounts for 10.0-15.0% of the total weight of the solid base material.
Preferably, the sleeve grouting material for connecting the low temperature-sensitive self-stress quick-hardening steel bar is steel slag micro powder, wherein the weight ratio of f to CaO in the steel slag micro powder is 4.0-8.0%, the weight ratio of MgO is more than or equal to 15%, and the specific surface area is 450-600 m-2/kg。
Preferably, the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar is prepared by grinding and granulating blast furnace slag powder or electric furnace phosphate slag powder, neutral or acid slag and an alkalinity coefficient M00.85-1.00 percent, the ignition loss is less than or equal to 1.50 percent, and the specific surface area is 400-600m2/kg。
Preferably, the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar is high-calcium fly ash with fineness d50Less than or equal to 5 mu m, specific surface area of 600-700m2The water demand ratio is less than or equal to 90 percent and the activity index is more than or equal to 90 percent in 28 days.
Preferably, the low-temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material is prepared by mixing aluminum slag micropowder with fineness d95Not more than 80 μm, wherein the weight ratio of AlN is not less than 50%.
Preferably, the low temperature-sensitive self-stress rapid-hardening type steel bar connecting sleeve grouting material comprises, by weight:
moisture-insulating swelling agent: 55.0 to 65.0 percent;
sodium silicate: 20.0 to 25.0 percent;
barium nitrate: 6.0 to 8.0 percent;
lignin: 9.0 to 12.0 percent.
Preferably, the low-temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material is a gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1200 ℃ to 1400 ℃, and the specific surface area is 400 ℃ to 600m2Per kg, the absolute hygroexpansivity is 0.15-0.17%; the components of the paint comprise, by weight:
f-CaO：40.0-45.0％，
CaSO4：15.0-20.0％，
C4A3S:5.0-10.0％；
the modulus of the sodium silicate is 2.0-2.8;
the purity of the barium nitrate is more than 99.3%.
Preferably, the low-temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material is prepared by mixing a polyether powder defoaming agent, polyethylene glycol and amorphous silicon dioxide.
Preferably, the low temperature-sensitive self-stress rapid-hardening type steel bar connection sleeve grouting material is prepared by mixing quartz sand with common quartz sand at three levels, and the low temperature-sensitive self-stress rapid-hardening type steel bar connection sleeve grouting material comprises the following components in percentage by weight:
10-20 mesh quartz sand: 45.0 to 55.0 percent;
20-40 mesh quartz sand: 20.0 to 30.0 percent;
40-70 mesh quartz sand: 20.0 to 30.0 percent.
By the technical scheme, the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar at least has the following advantages:
1) the invention adopts the alkali-activated steel slag-fly ash as the cementing material of the sleeve grouting material, reasonably optimizes the hydration process of a cementing system by using the low temperature-sensitive self-stress modifier and assisting the activator, realizes the low temperature sensitivity of the grouting material, solves the problems that the prior grouting material cannot be constructed or the strength cannot reach the standard due to overlarge fluidity loss caused by season exchange and temperature change, and is more suitable for engineering use;
2) the invention adopts gypsum and calcium oxide fusion inclusion concrete expanding agent with absolute wet expansion performance to prepare the low temperature-sensitive self-stress modifier, and leads the expansion and the strength of the grouting material to be coordinately increased by optimizing the firing temperature and the grain composition. Under the closed and strong constraint state of the sleeve, effective expansion is formed and chemical self-stress is established, the bonding force between the grouting material and the reinforcing steel bar is enhanced, the bond stress of the reinforcing steel bar is obviously improved, the connection reliability between components is improved, and potential safety hazards caused by the volume shrinkage of the traditional grouting material are eliminated;
3) the sleeve grouting material disclosed by the invention has low temperature sensitivity (both can be normally used at 0-35 ℃), good fluidity (initial fluidity 315-.
4) The invention uses a large amount of industrial waste residues such as steel slag, fly ash, aluminum slag and the like, has wide material sources and low cost, utilizes waste, saves energy, reduces emission, has great significance for reducing haze and protecting environment, and has remarkable social benefit and economic benefit.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
Detailed Description
To further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose, the following detailed description is given to the specific implementation, structure, characteristics and effects of the low temperature-sensitive self-stress quick-hardening type steel bar connection sleeve grouting material according to the present invention in combination with the preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar comprises a solid base material and an exciting agent which are packaged independently; wherein, the solid base material comprises the following components in percentage by weight:
steel slag: 10.0 to 15.0 percent;
slag: 15.0 to 25.0 percent;
fly ash: 10.0 to 15.0 percent;
plastic swelling agent: 0.20-0.35%;
low temperature sensitive self-stress modifier: 6.0 to 8.0 percent;
defoaming agent: 0.05-0.08%;
quartz sand: 40.0 to 50.0 percent.
Preferably, the activator is liquid water glass with a modulus of 1.2-1.8, and accounts for 10.0-15.0% of the total weight of the solid substrate.
Preferably, the steel slag is steel slag micro powder which is not hot-closed, the weight ratio of f to CaO in the steel slag micro powder is 4.0 to 8.0 percent, the weight ratio of MgO is more than or equal to 15 percent, and the specific surface area is 450-600m2/kg, the specific surface area is preferably 500-550m2In terms of/kg. The steel slag has the functions that: on the one hand, the SiO is activated under the action of an activator2、Al2O3The gelling property is generated, and the strength is provided for the sleeve grouting material; on the other hand, hydration of free CaO and MgO produces the expansive product Ca (OH)2And Mg (OH)2Compensating for the self-shrinkage of the matrix.
Preferably, the slag is ground granulated blast furnace slag powder or electric furnace phosphate slag powder, neutral or acid slag, and the alkalinity coefficient M00.85-1.00 percent, the ignition loss is less than or equal to 1.50 percent, and the specific surface area is 400-600m2Kg, excellent specific surface areaIs selected as 450-550m2/kg。
Preferably, the fly ash is high calcium fly ash with fineness d50Less than or equal to 5 mu m, specific surface area of 600-700m2The water demand ratio is less than or equal to 90 percent and the activity index is more than or equal to 90 percent in 28 days. The fly ash has the functions of: on one hand, the fluidity of the sleeve grouting material is improved, and simultaneously, the active SiO is activated under the action of the excitant2、Al2O3The gelling property is generated, and the strength is provided for the sleeve grouting material; on the other hand, hydration of free CaO produces the swellable product Ca (OH)2Compensating for the self-shrinkage of the matrix.
Preferably, the plastic expanding agent is aluminum slag micro powder which is not subjected to denitration treatment and has fineness d95Not more than 80 μm, wherein the weight ratio of AlN is not less than 50%.
Preferably, the low temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 55.0 to 65.0 percent;
sodium silicate: 20.0 to 25.0 percent;
barium nitrate: 6.0 to 8.0 percent;
lignin: 9.0 to 12.0 percent.
The low temperature-sensitive self-stress modifier has the following functions: on one hand, the hydration process of the sleeve grouting material is adjusted, and the temperature sensitivity is reduced; on the other hand, the steel bar is subjected to damp-proof expansion, effective expansion is formed in a constraint state, chemical self-stress is established, and the bond stress of the steel bar is improved.
Preferably, the moisture-insulating expanding agent is a gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1200-1400 ℃, preferably 1250-1300 ℃, and the specific surface area of the moisture-insulating expanding agent is 400-600m2Per kg, the absolute hygroexpansivity is 0.15-0.17%; the components of the paint comprise, by weight:
f-CaO：40.0-45.0％，
CaSO4：15.0-20.0％，
C4A3S:5.0-10.0％。
the moisture-insulating expanding agent has the double functions of establishing chemical self-stress and reducing temperature sensitivity. Under the condition of sleeve sealing and strong constraint, the grouting material is expanded and strength is coordinately increased to form effective expansion and establishThe chemical self-stress enhances the bonding force between the grouting material and the reinforcing steel bar, and obviously improves the bond strength of the reinforcing steel bar; in addition, the hydration exotherms and the hydration products Ca (OH) formed2The alkalinity of the system is increased, the hydration is promoted by synergistic superposition, the influence of low temperature (0-5 ℃) on the hydration, strength and other properties of the grouting material is eliminated, and the low temperature sensitivity is realized.
The sodium silicate is instant powdery sodium silicate, and the modulus is 2.0-2.8. The sodium silicate acts to activate the activity of the steel slag, slag and fly ash, resulting in gelation. But the excitation rate is relatively slow compared with liquid water glass, thereby slowing down the hydration process of the grouting material.
The barium nitrate is industrial grade barium nitrate, the purity of the barium nitrate is more than 99.3%, and the barium nitrate is powdery. The function of the grouting material is to slow down the hydration process of the grouting material.
The sodium silicate and the barium nitrate are synergistically superposed to slow down the hydration process of the grouting material, eliminate the influence of high temperature (30-35 ℃) on the fluidity and the filling property of the grouting material and further realize low temperature sensitivity.
Lignin is a by-product from paper making waste liquor. The function of the grouting material is to improve the fluidity and the filling property of the grouting material.
Preferably, the defoaming agent is at least one of polyether powder defoaming agent, polyethylene glycol and amorphous silicon dioxide mixture powder defoaming agent.
Preferably, the quartz sand is three-grade common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 45.0 to 55.0 percent;
20-40 mesh quartz sand: 20.0 to 30.0 percent;
40-70 mesh quartz sand: 20.0 to 30.0 percent.
The embodiment of the invention provides a low-temperature-sensitive self-stress quick-hardening type sleeve grouting material for connecting steel bars, and the components of the embodiments 1-10 are shown in Table 1.
TABLE 1 Components (in weight percent) of Low temperature sensitive self-stress quick-hardening sleeve grouting material for steel bar connection
Figure BDA0001485270950000071
The components of the low temperature sensitive self-stress modifier and the quartz sand in the low temperature sensitive self-stress rapid hardening type steel bar connecting sleeve grouting material of the examples 1-10 are shown in the table 2.
TABLE 2 composition of Low temperature sensitive self-stress modifier and Quartz Sand (% by weight)
Figure BDA0001485270950000072
Figure BDA0001485270950000081
The performance indexes of the components of the low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting the steel bars in the embodiments 1 to 10 are shown in Table 3.
TABLE 3 Performance indexes of the constituent materials of the low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting steel bars
Figure BDA0001485270950000082
The performance of the low temperature sensitive self-stress quick-hardening type steel bar joint sleeve grouting material (0-5 ℃) in the examples 1-10 is shown in Table 4.
TABLE 4 Low temperature sensitive self-stress quick hardening sleeve grouting material (0-5 deg.C) for steel bar connection performance test results
Figure BDA0001485270950000083
Figure BDA0001485270950000091
The properties of the low temperature sensitive self-stress quick-hardening type steel bar joint sleeve grouting materials (20 ℃) of examples 1-10 are shown in Table 5.
TABLE 5 Low temperature sensitive self-stress quick hardening sleeve grouting material (20 deg.C) for reinforcing bar connection performance test results
Figure BDA0001485270950000092
The properties of the low temperature-sensitive self-stress quick-hardening type steel bar joint sleeve grouting materials (30-35 ℃) in examples 1-10 are shown in Table 6.
TABLE 6 Low temperature sensitive self-stress quick hardening sleeve grouting material (30-35 deg.C) for reinforcing bar connection performance test results
Figure BDA0001485270950000101
Example 1
The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar comprises a solid base material and an exciting agent which are packaged independently; wherein, the solid base material comprises the following components in percentage by weight:
steel slag: 15.0 percent;
slag: 15.25 percent;
fly ash: 13.0 percent;
plastic swelling agent: 0.20 percent;
low temperature sensitive self-stress modifier: 6.5 percent;
defoaming agent: 0.05 percent;
quartz sand: 50.0 percent.
Wherein the excitant is liquid water glass, the modulus is 1.8, and the excitant accounts for 15.0 percent of the total weight of the solid base material.
The specific surface area of the steel slag is 500m2Per kg, specific surface area of slag 600m2Per kg, specific surface area of fly ash is 600m2/kg。
The low-temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 55.0 percent;
sodium silicate: 25.0 percent;
barium nitrate: 8.0 percent;
lignin: 12.0 percent.
Preferably, the absolute wet expanding agent is gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1200 ℃, and the specific surface area is 450m2Per kg; the sodium silicate has a modulus of 2.0Instant powdered sodium silicate.
The quartz sand is three-grade mixed common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 45.0 percent;
20-40 mesh quartz sand: 25.0 percent;
40-70 mesh quartz sand: 30.0 percent.
The use method of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar in the embodiment 1 comprises the following steps: uniformly mixing the solid base material, adding an exciting agent and water, wherein the weight of the water accounts for 20.0% of the solid base material, and stirring at a linear speed of 10m/s for 5min to obtain the low-temperature-sensitive self-stress sleeve grouting material which can be normally used at 0-35 ℃. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure.
At 0-5 ℃, the initial fluidity is 325mm, the fluidity is 310mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 40.2MPa, the 3d compressive strength is 72.8MPa, and the 28d compressive strength is 102.8 MPa; the vertical expansion rate of 3h is 0.25 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.45 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 1.68MPa, and the bond stress of the reinforcing steel bar is 6.7 MPa.
The initial fluidity is 320mm at 20 ℃, the fluidity is 295mm in 30min, and the separation and bleeding are avoided; the 1d compressive strength is 42.5MPa, the 3d compressive strength is 74.3MPa, and the 28d compressive strength is 105.2 MPa; the vertical expansion rate of 3h is 0.33 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.35 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 1.82MPa, and the bond stress of the reinforcing steel bar is 6.8 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 315mm, the 30min fluidity is 290mm, and the separation and the bleeding are avoided; the 1d compressive strength is 44.8MPa, the 3d compressive strength is 75.8MPa, and the 28d compressive strength is 108.6 MPa; the vertical expansion rate of 3h is 0.20 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.30 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 1.46MPa, and the bond stress of the reinforcing steel bar is 6.5 MPa.
Example 2
The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar comprises a solid base material and an exciting agent which are packaged independently; wherein, the solid base material comprises the following components in percentage by weight:
steel slag: 13.0 percent;
slag: 17.70 percent;
fly ash: 12.0 percent;
plastic swelling agent: 0.24 percent;
low temperature sensitive self-stress modifier: 7.0 percent;
defoaming agent: 0.06 percent;
quartz sand: 50.0 percent.
Wherein the excitant is liquid water glass, the modulus is 1.6, and the excitant accounts for 13.5 percent of the total weight of the solid base material.
The specific surface area of the steel slag is 450m2Per kg, specific surface area of slag 550m2Per kg, the specific surface area of the fly ash is 700m2/kg。
The low-temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 58.0 percent;
sodium silicate: 24.0 percent;
barium nitrate: 7.0 percent;
lignin: 11.0 percent.
Preferably, the absolute wet expanding agent is gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1250 ℃, and the specific surface area is 400m2Per kg; the sodium silicate is instant powdery sodium silicate with a modulus of 2.4.
The quartz sand is three-grade mixed common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 45.0 percent;
20-40 mesh quartz sand: 30.0 percent;
40-70 mesh quartz sand: 25.0 percent.
The use method of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar in the embodiment 2 comprises the following steps: uniformly mixing the solid base material, adding an exciting agent and water, wherein the weight of the water accounts for 20.0% of the solid base material, and stirring at a linear speed of 10m/s for 5min to obtain the low-temperature-sensitive self-stress sleeve grouting material which can be normally used at 0-35 ℃. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure.
At 0-5 ℃, the initial fluidity is 328mm, the fluidity is 309mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 40.8MPa, the 3d compressive strength is 71.5MPa, and the 28d compressive strength is 100.0 MPa; the vertical expansion rate of 3h is 0.24 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.48 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.19MPa, and the bond stress of the reinforcing steel bar is 6.9 MPa.
At 20 ℃, the initial fluidity is 325mm, the fluidity is 295mm in 30min, and the separation and bleeding are avoided; the 1d compressive strength is 43.0MPa, the 3d compressive strength is 74.3MPa, and the 28d compressive strength is 104.1 MPa; the vertical expansion rate of 3h is 0.35 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.40 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 3.06MPa, and the bond stress of the reinforcing steel bar is 7.0 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 320mm, the fluidity is 291mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 44.6MPa, the 3d compressive strength is 76.2MPa, and the 28d compressive strength is 108.9 MPa; the vertical expansion rate of 3h is 0.21 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.33 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.48MPa, and the bond stress of the reinforcing steel bar is 6.8 MPa.
Example 3
The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar comprises a solid base material and an exciting agent which are packaged independently; wherein, the solid base material comprises the following components in percentage by weight:
steel slag: 11.0 percent;
slag: 20.20 percent;
fly ash: 11.0 percent;
plastic swelling agent: 0.24 percent;
low temperature sensitive self-stress modifier: 7.5 percent;
defoaming agent: 0.06 percent;
quartz sand: 50.0 percent.
Wherein the excitant is liquid water glass, the modulus is 1.4, and the excitant accounts for 12.0 percent of the total weight of the solid base material.
The specific surface area of the steel slag is 550m2Per kg, specific surface area of slag 500m2Per kg, the specific surface area of the fly ash is 650m2/kg。
The low-temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 60.0 percent;
sodium silicate: 24.0 percent;
barium nitrate: 6.0 percent;
lignin: 10.0 percent.
Preferably, the absolute wet expanding agent is gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1300 ℃, and the specific surface area is 500m2Per kg; the sodium silicate is instant powdery sodium silicate with a modulus of 2.8.
The quartz sand is three-grade mixed common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 50.0 percent;
20-40 mesh quartz sand: 20.0 percent;
40-70 mesh quartz sand: 30.0 percent.
The use method of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar in the embodiment 3 comprises the following steps: uniformly mixing the solid base material, adding an exciting agent and water, wherein the weight of the water accounts for 20.0% of the solid base material, and stirring at a linear speed of 10m/s for 5min to obtain the low-temperature-sensitive self-stress sleeve grouting material which can be normally used at 0-35 ℃. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure.
At 0-5 ℃, the initial fluidity is 329mm, the 30min fluidity is 310mm, and the separation and the bleeding are avoided; the 1d compressive strength is 41.5MPa, the 3d compressive strength is 72.1MPa, and the 28d compressive strength is 103.1 MPa; the vertical expansion rate of 3h is 0.32 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.45 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.48MPa, and the bond stress of the reinforcing steel bar is 7.0 MPa.
At 20 ℃, the initial fluidity is 320mm, the fluidity is 310mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 43.5MPa, the 3d compressive strength is 75.2MPa, and the 28d compressive strength is 106.5 MPa; the vertical expansion rate of 3h is 0.40 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.42 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.92MPa, and the bond stress of the reinforcing steel bar is 7.2 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 317mm, the fluidity is 305mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 45.0MPa, the 3d compressive strength is 77.0MPa, and the 28d compressive strength is 110.0 MPa; the vertical expansion rate of 3h is 0.25 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.38 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.11MPa, and the bond stress of the reinforcing steel bar is 6.5 MPa.
Example 4
The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar comprises a solid base material and an exciting agent which are packaged independently; wherein, the solid base material comprises the following components in percentage by weight:
steel slag: 12.0 percent;
slag: 23.70 percent;
fly ash: 10.0 percent;
plastic swelling agent: 0.25 percent;
low temperature sensitive self-stress modifier: 8.0 percent;
defoaming agent: 0.05 percent;
quartz sand: 46.0 percent.
Wherein the excitant is liquid water glass, the modulus is 1.2, and the excitant accounts for 10.0 percent of the total weight of the solid base material.
The specific surface area of the steel slag is 550m2Per kg, specific surface area of slag 550m2Per kg, the specific surface area of the fly ash is 650m2And/kg, the plastic expanding agent is aluminum slag micro powder.
The low-temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 62.0 percent;
sodium silicate: 22.0 percent;
barium nitrate: 6.0 percent;
lignin: 10.0 percent.
Preferably, the absolute wet expanding agent is gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1400 ℃, and the specific surface area is 600m2Per kg; the sodium silicate is instant powdery sodium silicate with a modulus of 2.4.
The quartz sand is three-grade mixed common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 50.0 percent;
20-40 mesh quartz sand: 25.0 percent;
40-70 mesh quartz sand: 25.0 percent.
The use method of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar in the embodiment 4 comprises the following steps: uniformly mixing the solid base material, adding an exciting agent and water, wherein the weight of the water accounts for 20.0% of the solid base material, stirring at a linear speed of 10m/s for 5min to obtain the low-temperature-sensitive self-stress sleeve grouting material, and the grouting material can be normally used at 0-35 ℃. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure.
At 0-5 ℃, the initial fluidity is 326mm, the fluidity is 304mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 41.4MPa, the 3d compressive strength is 72.8MPa, and the 28d compressive strength is 102.4 MPa; the vertical expansion rate of 3h is 0.33 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.50 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 3.14MPa, and the bond stress of the reinforcing steel bar is 7.2 MPa.
At 20 ℃, the initial fluidity is 315mm, the fluidity is 305mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 43.1MPa, the 3d compressive strength is 74.2MPa, and the 28d compressive strength is 106.2 MPa; the vertical expansion rate of 3h is 0.42 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.45 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 3.65MPa, and the bond stress of the reinforcing steel bar is 7.5 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 310mm, the fluidity is 291mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 44.8MPa, the 3d compressive strength is 76.5MPa, and the 28d compressive strength is 108.4 MPa; the vertical expansion rate of 3h is 0.28 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.35 percent; chemical self-stress is established under the conditions of absolute wet expansion and strong restraint, the self-stress is 2.99MPa, and the bond stress of the reinforcing steel bar is 7.0 MPa.
The compositions and the uses of the low temperature sensitive self-stress quick hardening type steel bar connecting sleeve grouting materials of the examples 5-10 are as in the examples 1-4. The components of the low-temperature-sensitive self-stress quick-hardening sleeve grouting material for connecting the steel bars are shown in table 1. The components of the low-temperature-sensitive self-stress modifier and the quartz sand in the components of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar are shown in table 2. The performance indexes of the composition materials of the sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar are shown in table 3. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure. The results of the performance tests of the low temperature-sensitive self-stress rapid-hardening type steel bar connecting sleeve grouting materials of examples 5 to 10 at 0 to 5 ℃ are shown in table 4, the results of the performance tests of the low temperature-sensitive self-stress rapid-hardening type steel bar connecting sleeve grouting materials of examples 5 to 10 at 20 ℃ are shown in table 5, and the results of the performance tests of the low temperature-sensitive self-stress rapid-hardening type steel bar connecting sleeve grouting materials of examples 5 to 10 at 30 to 35 ℃ are shown in table 6.
As can be seen from tables 4 to 6, the sleeve grouting material for connecting the reinforcing steel bars prepared in the embodiments 1 to 10 has low temperature sensitivity, can be normally used at 0 to 35 ℃, and solves the problems that the conventional grouting material cannot be constructed or cannot reach the strength due to overlarge mobility loss caused by season exchange and temperature change. The grouting material can establish chemical self-stress under the conditions of absolute wet expansion, coordinated development of expansion and strength and strong constraint, remarkably improves the bond stress of the reinforcing steel bars, improves the connection reliability between components and eliminates potential safety hazards caused by volume contraction of the traditional grouting material.
Comparative example 1
One comparative example of the invention is a commercially available portland cement sleeve grouting material with the performance meeting the performance index requirement of JG/T408-2013 sleeve grouting material for connecting steel bars.
The method of use of the commercial portland cement sleeve grouting material of comparative example 1 was: adding water into the solid material, wherein the weight of the water accounts for 12.0 percent of the weight of the solid material, and stirring for 240 seconds according to the set program of the cement mortar stirrer to obtain the portland cement sleeve grouting material. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure.
At 0-5 ℃, the initial fluidity is 340mm, the fluidity is 330mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 30.1MPa, the 3d compressive strength is 56.8MPa, and the 28d compressive strength is 79.8 MPa; the vertical expansion rate of 3h is 0.22 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.14 percent; the self-stress is 0.05MPa, and the bond stress of the reinforcing steel bar is 4.5 MPa.
At 20 ℃, the initial fluidity is 320mm, the fluidity at 30min is 290mm, and the separation and the bleeding are avoided; the 1d compressive strength is 38.0MPa, the 3d compressive strength is 65.4MPa, and the 28d compressive strength is 90.2 MPa; the vertical expansion rate of 3h is 0.15 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.10 percent; the self-stress is 0.09MPa, and the bond stress of the reinforcing steel bar is 4.8 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 290mm, the fluidity at 30min is 205mm, and the separation and the bleeding are avoided; the 1d compressive strength is 42.3MPa, the 3d compressive strength is 70.2MPa, and the 28d compressive strength is 95.6 MPa; the vertical expansion rate of 3h is 0.01 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.00 percent; the self-stress is 0.05MPa, and the bond stress of the reinforcing steel bar is 4.3 MPa.
Comparative example 2
One comparative example of the invention is the commercial Portland cement and sulphoaluminate cement composite sleeve grouting material with the performance meeting the performance index requirement of JG/T408-2013 sleeve grouting material for connecting steel bars.
The application method of the commercial portland cement and sulphoaluminate cement composite sleeve grouting material of the comparative example 2 comprises the following steps: adding water into the solid material, wherein the weight of the water accounts for 12.0 percent of the weight of the solid material, and stirring for 240 seconds according to the set program of the cement mortar stirrer to obtain the Portland cement and sulphoaluminate cement composite sleeve grouting material. Testing fluidity, compressive strength and vertical expansion rate according to JG/T408-plus 2013 sleeve grouting material for steel bar connection, performing self-stress test under an absolute humidity condition according to JC/T453-plus 2004 self-stress cement physical inspection method, and performing reinforcement bond stress test according to SL 352-plus 2006 Water conservancy project concrete test procedure. At 0-5 ℃, the initial fluidity is 335mm, the fluidity is 335mm in 30min, and the separation and bleeding are avoided; the 1d compressive strength is 32.5MPa, the 3d compressive strength is 57.8MPa, and the 28d compressive strength is 82.4 MPa; the vertical expansion rate of 3h is 0.24 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.10 percent; the self-stress is 0.08MPa, and the bond stress of the reinforcing steel bar is 4.8 MPa.
At 20 ℃, the initial fluidity is 325mm, the fluidity is 300mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 40.1MPa, the 3d compressive strength is 70.7MPa, and the 28d compressive strength is 98.9 MPa; the vertical expansion rate of 3h is 0.20 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.18 percent; the self-stress is 0.12MPa, and the bond stress of the reinforcing steel bar is 5.2 MPa.
At the temperature of 30-35 ℃, the initial fluidity is 285mm, the fluidity is 225mm in 30min, and the separation and the bleeding are avoided; the 1d compressive strength is 43.5MPa, the 3d compressive strength is 75.2MPa, and the 28d compressive strength is 103.5 MPa; the vertical expansion rate of 3h is 0.01 percent, and the difference between the vertical expansion rates of 24h and 3h is 0.00 percent; the self-stress is 0.07MPa, and the bond stress of the reinforcing steel bar is 4.6 MPa.
The test results of the comparative examples 1 and 2 show that the performance fluctuation of the commercial portland cement sleeve grouting material and the commercial portland cement and sulphoaluminate cement composite sleeve grouting material is great at the use environment temperature of 0-35 ℃, and the cement composite sleeve grouting material is extremely sensitive to temperature change. At low temperature, the strength performance does not reach the standard; the loss of fluidity at high temperature is very large, and the construction cannot be carried out. And the volume of the grouting materials of the two components is shrunk, the self stress is almost zero, the bond stress of the reinforcing steel bars is reduced by about 40 percent compared with that of the embodiment 1-10, the connection reliability between the components is reduced, and the potential safety hazard is larger.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are still within the scope of the technical solution of the present invention.

Claims (9)

1. The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar is characterized by comprising a solid base material and an exciting agent, wherein the solid base material comprises the following components in percentage by weight:
steel slag: 10.0 to 15.0 percent;
slag: 15.0 to 25.0 percent;
fly ash: 10.0 to 15.0 percent;
plastic swelling agent: 0.20-0.35%;
low temperature sensitive self-stress modifier: 6.0 to 8.0 percent;
defoaming agent: 0.05-0.08%;
quartz sand: 40.0 to 50.0 percent;
the low temperature-sensitive self-stress modifier comprises the following components in percentage by weight:
moisture-insulating swelling agent: 55.0 to 65.0 percent;
sodium silicate: 20.0 to 25.0 percent;
barium nitrate: 6.0 to 8.0 percent;
lignin: 9.0 to 12.0 percent.
2. The low-temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material as claimed in claim 1, wherein the activator is liquid water glass, the modulus is 1.2-1.8, and the activator accounts for 10.0-15.0% of the total weight of the solid base material.
3. The sleeve grouting material for connecting the low-temperature-sensitive self-stress quick-hardening steel bar as claimed in claim 1, wherein the steel slag is steel slag micro powder, the weight ratio of f to CaO in the steel slag micro powder is 4.0-8.0%, the weight ratio of MgO is not less than 15%, and the specific surface area is 450-2/kg。
4. The low temperature-sensitive self-stress quick-hardening type sleeve grouting material for connecting steel bars according to claim 1, characterized in thatThe slag is ground and granulated blast furnace slag powder or electric furnace phosphate slag powder, neutral or acid slag and alkaline coefficient M00.85-1.00 percent, the ignition loss is less than or equal to 1.50 percent, and the specific surface area is 400-600m2/kg。
5. The low-temperature-sensitive self-stress quick-hardening type sleeve grouting material for steel bar connection according to claim 1, wherein the fly ash is high-calcium fly ash with fineness d50Less than or equal to 5 mu m, specific surface area of 600-700m2The water demand ratio is less than or equal to 90 percent and the activity index is more than or equal to 90 percent in 28 days.
6. The low-temperature-sensitive self-stress quick-hardening type sleeve grouting material for connecting the steel bar according to claim 1, characterized in that the plastic expanding agent is aluminum slag micro powder with fineness d95Not more than 80 μm, wherein the weight ratio of AlN is not less than 50%.
7. The low temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material as claimed in claim 1, wherein the moisture-proof expanding agent is a gypsum and calcium oxide fused inclusion concrete expanding agent, the firing temperature is 1200 ℃ and 1400 ℃, the specific surface area is 400 ℃ and 600m2Per kg, the absolute hygroexpansivity is 0.15-0.17%; the components of the paint comprise, by weight:
f-CaO：40.0-45.0％，
CaSO4：15.0-20.0％，
Figure FDA0002299252850000021
5.0-10.0％；
the modulus of the sodium silicate is 2.0-2.8;
the purity of the barium nitrate is more than 99.3%.
8. The low-temperature-sensitive self-stress quick-hardening type steel bar connecting sleeve grouting material as claimed in claim 1, wherein the defoaming agent is at least one of polyether powder defoaming agent, polyethylene glycol and amorphous silicon dioxide mixture powder defoaming agent.
9. The low-temperature-sensitive self-stress quick-hardening type steel bar connection sleeve grouting material as claimed in claim 1, wherein the quartz sand is three-grade-matched common quartz sand, and comprises the following components in percentage by weight:
10-20 mesh quartz sand: 45.0 to 55.0 percent;
20-40 mesh quartz sand: 20.0 to 30.0 percent;
40-70 mesh quartz sand: 20.0 to 30.0 percent.
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