CN111848089A - Ultrahigh-strength composite grouting material and preparation method and application thereof - Google Patents
Ultrahigh-strength composite grouting material and preparation method and application thereof Download PDFInfo
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- CN111848089A CN111848089A CN202010759499.XA CN202010759499A CN111848089A CN 111848089 A CN111848089 A CN 111848089A CN 202010759499 A CN202010759499 A CN 202010759499A CN 111848089 A CN111848089 A CN 111848089A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
- C04B28/142—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements
- C04B28/144—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements containing synthetic or waste calcium sulfate cements the synthetic calcium sulfate being a flue gas desulfurization product
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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
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses an ultrahigh-strength composite grouting material and a preparation method and application thereof, wherein the ultrahigh-strength composite grouting material is prepared from an ultrahigh-strength master batch, a heat stabilizer, a filtrate reducer and a strength modifier according to a mass ratio of 60-90: 3-25: 2-10: 5-15; the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃; the heat stabilizer consists of fly ash, granulated blast furnace slag powder, quartz powder, sodium gluconate and silica fume; the fluid loss additive consists of modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methylcellulose; the strength modifier consists of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride. The composite grouting material provided by the invention has the advantages of quick setting, ultrahigh strength, micro-expansion and the like, and can replace concrete to prepare a steel pipe concrete member.
Description
Technical Field
The invention belongs to the technical field of grouting material preparation, and relates to an ultrahigh-strength composite grouting material, and a preparation method and application thereof.
Background
The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
The current colliery rock burst is serious, and current hydraulic prop, wood buttress or frame canopy strut bearing capacity are serious not enough, can't resist rock burst load and contractibility ability poor, and leading hydraulic support can resist impact load, but has the shortcoming such as self weight is big, move inconveniently and occupy the tunnel space big. In recent years, in some coal mines, in order to prevent rock burst, a pillar member formed of a steel pipe and core concrete filled with concrete and capable of receiving an external load together is used to resist the impact load, thereby achieving a certain impact prevention effect.
However, through the research of the inventor of the present invention, it was found that the concrete filled steel tube member has technical disadvantages including: 1. the core concrete compression strength is greatly reduced due to the reasons of large sand-gravel material grading difference, difficult accurate control of water-cement ratio, poor concrete self-sealing property and the like, so that the bearing capacity of the whole member is influenced; 2. shrinkage exists in the concrete solidification process, and a gap is formed between the concrete and the wall of the steel pipe, so that the bearing capacity of the integral member is greatly influenced; 3. concrete preparation, pumping equipment are huge and heavy, and the construction difficulty is large.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide the ultrahigh-strength composite grouting material, and the preparation method and the application thereof.
In order to achieve the purpose, the technical scheme of the invention is as follows:
on the one hand, the ultrahigh-strength composite grouting material is prepared from raw materials of an ultrahigh-strength master batch, a heat stabilizer, a filtrate reducer and a strength modifier according to a mass ratio of 60-90: 3-25: 2-10: 5-15;
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
the heat stabilizer consists of fly ash, granulated blast furnace slag powder, quartz powder, sodium gluconate and silica fume;
the fluid loss additive consists of modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methyl cellulose;
the strength modifier consists of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride.
On the other hand, the preparation method of the ultrahigh-strength composite grouting material comprises the following steps:
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
uniformly mixing the fly ash, the granulated blast furnace slag powder, the quartz powder, the sodium gluconate and the silica fume to obtain a heat stabilizer;
uniformly mixing the modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methylcellulose to obtain a filtrate reducer;
uniformly mixing a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride to obtain a strength modifier;
uniformly stirring the ultrahigh-strength master batch, the heat stabilizer, the filtrate reducer and the strength modifier according to the mass ratio of 60-90: 3-25: 2-10: 5-15 to obtain the composite material.
In a third aspect, the ultrahigh-strength composite grouting material is applied to a steel pipe concrete member, and the substitute material of concrete in the steel pipe concrete member is the ultrahigh-strength composite grouting material.
The invention has the beneficial effects that:
1. the ultrahigh-strength composite grouting material provided by the invention slightly expands after being solidified, and the bearing capacity of the whole member is far greater than that of a concrete-filled steel tube member under the same condition, so that the ultrahigh-strength composite grouting material can be used as a core concrete substitute material of the concrete-filled steel tube member.
2. The ultrahigh-strength composite grouting material provided by the invention has the advantages of high resistance increasing speed and short time interval between initial setting and final setting.
3. The ultrahigh-strength composite grouting material provided by the invention has high compressive strength, the compressive strength can reach more than 30MPa within 2h, and the highest compressive strength can reach more than 100MPa within 28 d.
4. The ultrahigh-strength composite grouting material provided by the invention effectively utilizes solid wastes such as desulfurized gypsum powder, red mud, gasified slag and the like, and greatly reduces the comprehensive production cost of the material.
5. The ultrahigh-strength composite grouting material provided by the invention is simple in construction operation process and low in labor intensity.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The invention provides an ultrahigh-strength composite grouting material and a preparation method and application thereof, aiming at the problems of low strength, easy shrinkage in a solidification process and the like of concrete in the existing concrete-filled steel tube member.
The invention provides an ultrahigh-strength composite grouting material, which comprises raw materials of an ultrahigh-strength master batch, a heat stabilizer, a fluid loss additive and a strength modifier according to a mass ratio of 60-90: 3-25: 2-10: 5-15;
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
the heat stabilizer consists of fly ash, granulated blast furnace slag powder, quartz powder, sodium gluconate and silica fume;
the fluid loss additive consists of modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methyl cellulose;
the strength modifier consists of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride.
In some examples of the embodiment, the mass ratio of the limestone, the alumina, the portland cement clinker, the desulfurized gypsum powder, the red mud and the gasified slag is 20-35: 20-30: 5-15: 15-25: 15-20: 5-15.
In some examples of this embodiment, the heat stabilizer comprises, by mass, 15 to 35 parts of fly ash, 20 to 55 parts of granulated blast furnace slag powder, 10 to 25 parts of quartz powder, 10 to 25 parts of sodium gluconate, and 5 to 15 parts of silica fume.
In some examples of this embodiment, the fluid loss additive comprises, by mass, 55 to 70 parts of modified bentonite, 15 to 25 parts of sodium carboxymethyl cellulose, and 15 to 20 parts of hydroxypropyl methyl cellulose.
In some examples of this embodiment, the strength modifier comprises, by mass, 10 to 25 parts of a polycarboxylic acid water reducing agent, 35 to 55 parts of a naphthalene water reducing agent, 5 to 15 parts of an organosilicon polymer, 5 to 10 parts of aluminum potassium sulfate, and 5 to 20 parts of lithium chloride.
In another embodiment of the present invention, a method for preparing an ultrahigh-strength composite grouting material is provided, which includes the following steps:
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
uniformly mixing the fly ash, the granulated blast furnace slag powder, the quartz powder, the sodium gluconate and the silica fume to obtain a heat stabilizer;
uniformly mixing the modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methyl cellulose to obtain a filtrate reducer;
uniformly mixing a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride to obtain a strength modifier;
uniformly stirring the ultrahigh-strength master batch, the heat stabilizer, the filtrate reducer and the strength modifier according to the mass ratio of 60-90: 3-25: 2-10: 5-15 to obtain the composite material.
In some examples of the embodiment, the mass ratio of the limestone, the alumina, the portland cement clinker, the desulfurized gypsum powder, the red mud and the gasified slag is 20-35: 20-30: 5-15: 15-25: 15-20: 5-15.
Firstly, the ultrahigh-strength master batch utilizes solid wastes of red mud, desulfurized gypsum powder and gasified slag, is green and environment-friendly, and has low comprehensive cost; and secondly, the alkalinity coefficient of the ultrahigh-strength master batch is improved by adding the red mud and the gasified slag, so that the solidification time, the early strength and the final strength of the ultrahigh-strength master batch are greatly improved.
In some examples of this embodiment, the heat stabilizer comprises, by mass, 15 to 35 parts of fly ash, 20 to 55 parts of granulated blast furnace slag powder, 10 to 25 parts of quartz powder, 10 to 25 parts of sodium gluconate, and 5 to 15 parts of silica fume.
The selection and proportion range of the raw materials of the heat stabilizer are finally obtained through a large amount of experimental data, and the active effect and the micro-aggregate effect of the materials are mainly utilized when the fly ash, the granulated blast furnace slag powder, the quartz powder and the silica fume are added; the sodium gluconate is added, so that the surface potential of the particles is increased by the association of hydroxyl polar groups on the surfaces of the ultra-high strength master batch particles through hydrogen bonds, and the hydration reaction is delayed.
Active effect: both fly ash and granulated blast furnace slag powder contain active SiO2And Al2O3Ca (OH) released during hydration with ultra-high strength masterbatch2The calcium silicate hydrate and the ettringite are generated by reaction, and the active chemical components of the fly ash and the granulated blast furnace slag powder have different contents, so that the hydration activity of the ultrahigh-strength master batch can be changed.
Micro-aggregate effect: the particle diameters of the fly ash, the granulated blast furnace slag powder, the quartz powder and the silica fume are smaller than that of the ultrahigh-strength master batch, so that gaps among particles of the ultrahigh-strength master batch can be filled, the hydration reaction of the ultrahigh-strength master batch is relieved, and the hydration reaction area is stable.
In some examples of this embodiment, the fluid loss additive comprises, by mass, 55 to 70 parts of modified bentonite, 15 to 25 parts of sodium carboxymethyl cellulose, and 15 to 20 parts of hydroxypropyl methyl cellulose.
In some examples of this embodiment, the strength modifier comprises, by mass, 10 to 25 parts of a polycarboxylic acid water reducing agent, 35 to 55 parts of a naphthalene water reducing agent, 5 to 15 parts of an organosilicon polymer, 5 to 10 parts of aluminum potassium sulfate, and 5 to 20 parts of lithium chloride.
The polycarboxylate water reducing agent and the naphthalene water reducing agent are compounded to obviously reduce the water-cement ratio of the material and improve the strength of the material, and the functions of the polycarboxylate water reducing agent and the naphthalene water reducing agent are mainly embodied in the following aspects:
(1) dispersing action: after the material is mixed by adding water, the material slurry forms a flocculation structure under the action of molecular gravity of material particles, so that 10-30% of mixing water is wrapped in the material particles and cannot participate in free flow and lubrication, thereby influencing the fluidity of the mixture. After the water reducing agent is added, the water reducing agent molecules can be directionally adsorbed on the surfaces of the material particles, so that the surfaces of the material particles are provided with the same charge (usually negative charge), an electrostatic repulsion effect is formed, the material particles are promoted to be mutually dispersed, a flocculation structure is damaged, and wrapped water is released to participate in flowing, so that the flowability of slurry is effectively increased.
(2) Lubrication: the hydrophilic groups in the water reducing agent have strong polarity, so that the water reducing agent adsorption film on the surface of the material particles can form a stable solvated water film with water molecules, and the water film has good lubricating effect and can effectively reduce the sliding resistance among cement particles, thereby further improving the fluidity of the material.
(3) Steric hindrance: the water reducing agent has hydrophilic polyether side chain extending in water solution to form hydrophilic stereo adsorption layer of certain thickness on the surface of adsorbed cement grains. When the material particles approach, the adsorption layers begin to overlap, namely, steric hindrance is generated among the material particles, and the more the overlap is, the larger the steric hindrance repulsive force is, and the larger the hindrance to the agglomeration among the material particles is.
(4) Sustained release of graft copolymer branches: in the preparation process of the polycarboxylic acid water reducing agent, a plurality of branched chains are grafted on the molecules of the water reducing agent, the branched chains not only can provide steric hindrance effect, but also can be slowly cut off in the high-alkalinity environment of material hydration, so that polycarboxylic acid with the dispersing function is released, the dispersing effect of material particles can be improved, and the solidification time can be controlled.
After the organosilicon polymer is added, bubbles formed in the slurry stirring process are eliminated, so that the porosity of an internal structure of the slurry solidified is greatly reduced, and the compressive strength of the slurry solidified body is greatly improved.
The compounding of the aluminum potassium sulfate and the lithium chloride can obviously shorten the initial setting time of the ultrahigh-strength master batch and improve the early strength of the material.
According to a third embodiment of the invention, the application of the ultrahigh-strength composite grouting material in the concrete-filled steel tube member is provided, and the substitute material of concrete in the concrete-filled steel tube member is the ultrahigh-strength composite grouting material.
In some examples of this embodiment, the ultra-high strength composite grouting material is mixed with water to obtain a grouting material, and the grouting material is used to replace concrete in the steel pipe concrete member.
In one or more embodiments, the water-cement ratio of the ultra-high strength composite grouting material to water is 0.2-0.4.
In order to make the technical solution of the present invention more clearly understood by those skilled in the art, the technical solution of the present invention will be described in detail below with reference to specific examples and comparative examples.
Example 1
The ultrahigh-strength composite grouting material is prepared by the following steps:
(1) the method comprises the following steps of drying 20 parts of limestone, 30 parts of alumina, 15 parts of ordinary portland cement clinker, 15 parts of desulfurized gypsum powder, 15 parts of red mud and 5 parts of gasified slag at the high temperature of 1350 ℃ to obtain ultrahigh-strength master batch clinker, grinding the ultrahigh-strength master batch clinker in a ball mill to the ground state, and sieving with a 800-mesh sieve to obtain the ultrahigh-strength master batch.
(2) And uniformly mixing 15 parts of fly ash, 40 parts of granulated blast furnace slag powder, 20 parts of quartz powder, 15 parts of sodium gluconate and 10 parts of silica fume to obtain the heat stabilizer.
(3) The modified bentonite (purchased from Zhejiang Weifang Li Co., Ltd.) 65 parts, carboxymethylcellulose sodium (purchased from Shandong Weifang Li Co., Ltd.) 15 parts, and hydroxypropyl methylcellulose (purchased from Shandong Weifang Li Co., Ltd.) 20 parts were mixed uniformly to obtain the filtrate reducer.
(4) Uniformly mixing 15 parts of polycarboxylic acid water reducer (purchased from Suzhou Xingbang building materials Co., Ltd.), 45 parts of naphthalene water reducer (purchased from Shandong Wanshan chemical Co., Ltd.), 15 parts of organic silicon polymer (purchased from Xister environmental protection materials science and technology Co., Ltd. of Fujian province), 10 parts of aluminum potassium sulfate (purchased from Zibo Zichuan Chengdong chemical plant of Zibo city) and 15 parts of lithium chloride (purchased from Shanghai Li practical Co., Ltd.) to obtain the strength modifier.
(5) Pouring 70 parts of ultrahigh-strength master batch, 20 parts of heat stabilizer, 5 parts of filtrate reducer and 5 parts of strength modifier into a dry mixer, uniformly stirring to obtain a composite grouting material, filling the composite grouting material into a 25kg inner-film plastic bag through an automatic packaging machine, and sealing.
(6) And (3) transporting the dry mixture to a construction site, pouring the dry mixture into a stirring hopper of the stirring and conveying integrated machine, connecting a flexible water pipe to a water injection port of the stirring and conveying integrated machine, connecting the other end of the flexible water pipe to a water source connector of the construction site, and adding the required water quantity through a liquid flowmeter according to the water-cement ratio of 0.30.
(7) And adding the required water amount into the dry mixture in the stirring and grouting integrated machine, and continuously stirring for 2min to obtain uniform slurry grouting material.
Example 2
(1) 25 parts of limestone, 25 parts of alumina, 10 parts of ordinary portland cement clinker, 15 parts of desulfurized gypsum powder, 15() parts of red mud and 10 parts of gasified slag are dried at the high temperature of 1350 ℃ to obtain the ultrahigh-strength master batch clinker, the ultrahigh-strength master batch clinker is ground in a ball mill to be ground, and the ground ultrahigh-strength master batch is sieved by a 800-mesh sieve to obtain the ultrahigh-strength master batch.
(2) Uniformly mixing 25 parts of fly ash, 40 parts of granulated blast furnace slag powder, 15 parts of quartz powder, 10 parts of sodium gluconate and 10 parts of silica fume to obtain the heat stabilizer.
(3) And uniformly mixing 55 parts of modified bentonite, 25 parts of sodium carboxymethylcellulose and 20 parts of hydroxypropyl methyl cellulose to obtain the fluid loss additive.
(4) Uniformly mixing 20 parts of polycarboxylic acid water reducing agent, 40 parts of naphthalene water reducing agent, 10 parts of organic silicon polymer, 10 parts of aluminum potassium sulfate and 20 parts of lithium chloride to obtain the strength modifier.
(5) Pouring 75 parts of ultrahigh-strength master batch, 15 parts of heat stabilizer, 2 parts of filtrate reducer and 8 parts of strength modifier into a dry mixer, uniformly stirring to obtain a composite grouting material, and filling the composite grouting material into a 25kg inner-film plastic bag through an automatic packaging machine and sealing.
(6) And (3) transporting the dry mixture to a construction site, pouring the dry mixture into a stirring hopper of the stirring and conveying integrated machine, connecting a flexible water pipe to a water injection port of the stirring and conveying integrated machine, connecting the other end of the flexible water pipe to a water source connector of the construction site, and adding the required water quantity through a liquid flowmeter according to the water-cement ratio of 0.25.
(7) And adding the required water amount into the dry mixture in the stirring and grouting integrated machine, and continuously stirring for 2min to obtain uniform slurry grouting material.
Example 3
The ultrahigh-strength composite grouting material is prepared by the following steps:
(1) 25 parts of limestone, 20 parts of alumina, 5 parts of ordinary portland cement clinker, 20 parts of desulfurized gypsum powder, 15 parts of red mud and 15 parts of gasified slag are dried at the high temperature of 1350 ℃ to obtain the ultrahigh-strength master batch clinker, the ultrahigh-strength master batch clinker is ground in a ball mill to be ground, and the ground ultrahigh-strength master batch is sieved by a 800-mesh sieve to obtain the ultrahigh-strength master batch.
(2) Uniformly mixing 35 parts of fly ash, 30 parts of granulated blast furnace slag powder, 20 parts of quartz powder, 10 parts of sodium gluconate and 5 parts of silica fume to obtain the heat stabilizer.
(3) And uniformly mixing 70 parts of modified bentonite, 15 parts of sodium carboxymethylcellulose and 15 parts of hydroxypropyl methyl cellulose to obtain the fluid loss additive.
(4) Uniformly mixing 25 parts of polycarboxylic acid water reducing agent, 35 parts of naphthalene water reducing agent, 15 parts of organic silicon polymer, 10 parts of aluminum potassium sulfate and 15 parts of lithium chloride to obtain the strength modifier.
(5) Pouring 85 parts of ultrahigh-strength master batch, 3 parts of heat stabilizer, 2 parts of filtrate reducer and 10 parts of strength modifier into a dry mixer, uniformly stirring to obtain a composite grouting material, and filling the composite grouting material into a 25kg inner-film plastic bag through an automatic packaging machine and sealing.
(6) And (3) transporting the dry mixture to a construction site, pouring the dry mixture into a stirring hopper of the stirring and conveying integrated machine, connecting a flexible water pipe to a water injection port of the stirring and conveying integrated machine, connecting the other end of the flexible water pipe to a water source connector of the construction site, and adding the required water quantity through a liquid flowmeter according to the water-cement ratio of 0.22.
(7) And adding the required water amount into the dry mixture in the stirring and grouting integrated machine, and continuously stirring for 2min to obtain uniform slurry grouting material.
The properties of the grouting materials prepared in examples 1 to 3 are shown in Table 1.
TABLE 1 Performance results for grouting materials obtained in examples 1 to 3
| Examples | Initial setting time (min) | Final setting time (min) | 2h compressive strength (MPa) | 7d compressive Strength (MPa) | Swelling ratio (%) |
| 1 | 30 | 35 | 32.5 | 72.5 | 0.55 |
| 2 | 25 | 30 | 36.5 | 81.3 | 0.65 |
| 3 | 20 | 25 | 41.5 | 95.5 | 0.75 |
In order to prove that the stabilizer added in the present invention has a thermal stabilization effect, the thermal stability of the grouting material is shown in table 2 by changing the addition amount of the thermal stabilizer in example 3.
TABLE 2 comparison of thermal stability
| Serial number | Super-high-strength master batch | Heat stabilizer | Filtrate reducer | Strength modifier | Water cement ratio | Temperature rise (. degree. C.) of slurry | Duration of heating (h) |
| 1 | 85 | 3 | 2 | 10 | 0.22 | 45 | 6 |
| 2 | 85 | 5 | 2 | 8 | 0.22 | 40 | 5.5 |
| 3 | 85 | 10 | 2 | 3 | 0.22 | 35 | 4.5 |
Table 2 shows that the addition amount of the thermal stabilizer provided in example 3 affects the thermal stability of the grouting material, and the thermal stability is better when the amount of the thermal stabilizer is increased.
In order to prove that the fluid loss additive added in the invention has the fluid loss reducing effect, the addition amount of the fluid loss additive in example 3 is changed, and the fluid loss additive performance of the grouting material is shown in table 3.
Table 3 fluid loss additive performance comparison
| Serial number | Super-high-strength master batch | Heat stabilizer | Filtrate reducer | Strength modifier | Water cement ratio | Bleeding Rate (%) |
| 1 | 85 | 3 | 2 | 10 | 0.22 | 0.85 |
| 2 | 85 | 3 | 5 | 7 | 0.22 | 0.55 |
| 3 | 85 | 3 | 8 | 4 | 0.22 | No bleeding |
Table 3 shows that the amount of the fluid loss additive provided in example 3 affects the fluid loss performance of the grouting material, and the fluid loss performance is better when the amount of the fluid loss additive is increased. Particularly, when the mass ratio of the ultrahigh-strength master batch to the heat stabilizer to the fluid loss additive to the strength modifier is 85:3:8:4, no bleeding occurs, and the fluid loss reduction performance is the best.
In order to prove that the strength modifier added in the invention has the effect of changing the strength, the addition amount of the strength modifier in example 3 is changed, and the strength performance of the grouting material is shown in table 4.
Table 4 strength modifier performance comparison
Table 4 shows that the added amount of the strength modifier provided in example 3 affects the strength of the grouting material, and the strength is higher when the amount of the strength modifier is increased.
The composition of the ultrahigh-strength master batch provided by the invention is similar to that of sulphoaluminate cement, but the invention aims to prepare a special ultrahigh-strength master batch which has the properties of sulphoaluminate cement clinker and is far better than that of common sulphoaluminate cement clinker in certain properties rather than simply preparing a substance similar to sulphoaluminate cement clinker. The ultra-high strength master batch prepared by one formula of the invention is compared with sulphoaluminate cement. Wherein, the ultra-high strength master batch comprises the following raw materials: the mass ratio of limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified coal slag is 25:25:10:20:15: 5. The property pair with sulphoaluminate cement is shown in table 5.
TABLE 5 comparative experiment of sulphoaluminate cement and ultrahigh strength master batch
The comparison shows that the performance of the ultrahigh-strength master batch prepared by the proportion is far better than that of sulphoaluminate cement, and the ultrahigh-strength master batch is more suitable for preparing ultrahigh-strength composite grouting materials. Experiments prove that the mass ratio of limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag is 20-35: 20-30: 5-15: 15-25: 15-20: 5-15, and the ultrahigh-strength master batch prepared in the proportioning range is superior to sulphoaluminate cement in performance.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The ultrahigh-strength composite grouting material is characterized in that raw materials comprise ultrahigh-strength master batch, a heat stabilizer, a filtrate reducer and a strength modifier according to a mass ratio of 60-90: 3-25: 2-10: 5-15;
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
the heat stabilizer consists of fly ash, granulated blast furnace slag powder, quartz powder, sodium gluconate and silica fume;
the fluid loss additive consists of modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methyl cellulose;
the strength modifier consists of a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride.
2. The ultrahigh-strength composite grouting material as claimed in claim 1, wherein the mass ratio of limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag is 20-35: 20-30: 5-15: 15-25: 15-20: 5-15.
3. The ultra-high strength composite grouting material as claimed in claim 1, wherein the heat stabilizer comprises, by mass, 15 to 35 parts of fly ash, 20 to 55 parts of granulated blast furnace slag powder, 10 to 25 parts of quartz powder, 10 to 25 parts of sodium gluconate, and 5 to 15 parts of silica fume.
4. The ultra-high strength composite grouting material according to claim 1, wherein the fluid loss additive comprises, by mass, 55 to 70 parts of modified bentonite, 15 to 25 parts of sodium carboxymethylcellulose, and 15 to 20 parts of hydroxypropyl methylcellulose.
5. The ultrahigh-strength composite grouting material of claim 1, wherein the strength modifier comprises, by mass, 10 to 25 parts of a polycarboxylic acid water reducing agent, 35 to 55 parts of a naphthalene water reducing agent, 5 to 15 parts of an organosilicon polymer, 5 to 10 parts of aluminum potassium sulfate, and 5 to 20 parts of lithium chloride.
6. A preparation method of an ultrahigh-strength composite grouting material is characterized by comprising the following steps:
the ultrahigh-strength master batch is obtained by calcining limestone, alumina, portland cement clinker, desulfurized gypsum powder, red mud and gasified slag at the high temperature of 1300-1500 ℃;
uniformly mixing the fly ash, the granulated blast furnace slag powder, the quartz powder, the sodium gluconate and the silica fume to obtain a heat stabilizer;
uniformly mixing the modified bentonite, sodium carboxymethylcellulose and hydroxypropyl methylcellulose to obtain a filtrate reducer;
uniformly mixing a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, an organic silicon polymer, aluminum potassium sulfate and lithium chloride to obtain a strength modifier;
uniformly stirring the ultrahigh-strength master batch, the heat stabilizer, the filtrate reducer and the strength modifier according to the mass ratio of 60-90: 3-25: 2-10: 5-15 to obtain the composite material.
7. The preparation method of the ultrahigh-strength composite grouting material as claimed in claim 6, wherein the mass ratio of the limestone, the alumina, the portland cement clinker, the desulfurized gypsum powder, the red mud and the gasified coal slag is 20-35: 20-30: 5-15: 15-25: 15-20: 5-15;
or the heat stabilizer comprises, by mass, 15-35 parts of fly ash, 20-55 parts of granulated blast furnace slag powder, 10-25 parts of quartz powder, 10-25 parts of sodium gluconate and 5-15 parts of silica fume;
or, the filtrate reducer comprises, by mass, 55-70 parts of modified bentonite, 15-25 parts of sodium carboxymethylcellulose and 15-20 parts of hydroxypropyl methylcellulose;
or the strength modifier comprises, by mass, 10-25 parts of a polycarboxylic acid water reducing agent, 35-55 parts of a naphthalene water reducing agent, 5-15 parts of an organic silicon polymer, 5-10 parts of aluminum potassium sulfate and 5-20 parts of lithium chloride.
8. The use of the ultrahigh-strength composite grouting material as claimed in any one of claims 1 to 5 in a concrete-filled steel tube member, wherein the substitute material for concrete in the concrete-filled steel tube member is the ultrahigh-strength composite grouting material.
9. The use of the ultra-high strength composite grouting material in a concrete filled steel tube member according to claim 8, characterized in that the ultra-high strength composite grouting material is mixed with water to obtain a grouting material, and the grouting material is used to replace concrete in the concrete filled steel tube member.
10. The application of the ultrahigh-strength composite grouting material in the steel pipe concrete member as claimed in claim 9, wherein the water-cement ratio of the ultrahigh-strength composite grouting material to water is 0.2-0.4.
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