CN108264299B - High-stability pumping structure ceramsite concrete and preparation method thereof - Google Patents
High-stability pumping structure ceramsite concrete and preparation method thereof Download PDFInfo
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- CN108264299B CN108264299B CN201810300817.9A CN201810300817A CN108264299B CN 108264299 B CN108264299 B CN 108264299B CN 201810300817 A CN201810300817 A CN 201810300817A CN 108264299 B CN108264299 B CN 108264299B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00008—Obtaining or using nanotechnology related materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00146—Sprayable or pumpable mixtures
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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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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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- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides high-stability pumping structure ceramsite concrete and a preparation method thereof, wherein the concrete comprises the following raw materials in parts by weight: 100 parts of cement, 10-25 parts of fly ash, 0-35 parts of mineral powder, 5-12 parts of silica fume, 160 parts of artificial sand, 200 parts of ceramsite 145-containing, 0-60 parts of ceramic sand, 1.0-2.2 parts of pumping agent, 0.8-1.5 parts of cellulose fiber, 1-2.5 parts of friction agent, 0.08-0.18 part of viscosity regulator and 38-55 parts of water. According to the invention, the pumping agent, the friction agent and the viscosity regulator are reasonably added, and the hydrophobic isolation agent is adopted to soak the ceramsite and the ceramic sand, so that the technical problems that the ceramsite is easy to float upwards in the production, transportation and pumping processes of ceramsite concrete, and further the concrete is layered, separated and not easy to pump are solved.
Description
Technical Field
The invention relates to the technical field of concrete production, in particular to high-stability pumping structure ceramsite concrete and a preparation method thereof.
Background
With the increasing importance and support of the national wall reform and the energy-saving construction work, the wall application is mainly designed and applied in the directions of light dead weight, good energy-saving and heat-insulating performance, high strength and durability, high safety and sustainable development. Ceramsite concrete is used as lightweight aggregate concrete with good heat insulation performance, and is widely applied in engineering, and particularly, the fully lightweight concrete is successfully used as a heat insulation layer on building roofs and building floors. As the self weight of the ceramsite concrete is lighter, the weight of the ceramsite concrete is reduced by 1/4-1/5 compared with that of the common concrete under the condition of the same strength, and the ceramsite concrete is increasingly used for large-span bridges to reduce the self weight of the structure. Therefore, in recent years, the unique advantages of the high-strength ceramsite concrete used as a building structure are gradually favored by designers. However, due to the influence of the special properties of the raw materials of the lightweight aggregate concrete, compared with the common concrete, the pumping performance of the ceramsite concrete is poorer, and the ceramsite concrete produced by most commercial concrete mixing plants can hardly meet the requirements of pumping construction. The main reasons are: 1. the ceramsite has low density, and is easy to float, layer and separate in the production, transportation and pumping processes; 2. the ceramsite belongs to an internal porous material, and has high water absorption rate, so that the working state of ceramsite concrete is good when the ceramsite concrete is taken out of a machine, and the state of the ceramsite concrete transported to a site is poor; 3. in the pumping process, slurry and moisture easily enter the inner holes of the ceramsite under the condition of pumping pressure, so that the performance of a concrete mixture is suddenly changed, the flowability and the wrapping property are poor, the whole body becomes dry and astringent, and the pumping is difficult and even the pipe is blocked. The smaller the volume weight of the ceramsite concrete is, the larger the fluidity is, the more easily the above problems occur. The structural ceramsite concrete is generally used in a large amount, and pumping construction cannot be carried out, so that the application of the ceramsite concrete in structural engineering is seriously hindered, and the application is also one of the important reasons that the existing structural ceramsite concrete has few cases when being used for building structures.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention aims to provide a high-stability ceramsite concrete with a pumping structure and a preparation method thereof, which are used for solving the problems that the concrete in the prior art has poor flowability and encapsulation, is easy to float, layer and separate during production, transportation and pumping, and is difficult to pump.
In order to achieve the above and other related objects, a first aspect of the present invention provides a high-stability pumping structure ceramsite concrete, which comprises the following raw materials in parts by weight: 100 parts of cement, 10-25 parts of fly ash, 0-35 parts of mineral powder, 5-12 parts of silica fume, 160 parts of artificial sand, 200 parts of ceramsite 145-containing, 0-60 parts of ceramic sand, 1.0-2.2 parts of pumping agent, 0.8-1.5 parts of cellulose fiber, 1-2.5 parts of friction agent, 0.08-0.18 part of viscosity regulator and 38-55 parts of water.
Preferably, the feed comprises the following raw materials in parts by weight: 100 parts of cement, 10-18 parts of fly ash, 20-30 parts of mineral powder, 5-11 parts of silica fume, 150 parts of artificial sand 125-containing materials, 200 parts of ceramsite 147-containing materials, 0-50 parts of ceramic sand, 1.2-2.1 parts of pumping agent, 0.9-1.4 parts of cellulose fiber, 1.1-2.3 parts of friction agent, 0.09-0.17 part of viscosity regulator and 38-55 parts of water.
In some embodiments of the invention, the cement is 42.5 ordinary portland cement, the fly ash is class i fly ash, the mineral powder is S95 mineral powder, the content of materials with fineness less than 1 μm in silica fume is more than 80wt%, and the average particle size is 0.1-0.3 μm.
In some embodiments of the invention, the artificial sand has a fineness modulus of 2.5-2.7, the material with a particle size range of 0.15-0.3mm is not less than 15wt%, the MB value is less than 1.4, and the stone powder content is not more than 7 wt%.
In some embodiments of the present invention, the ceramsite is at least one selected from clay ceramsite, fly ash ceramsite, shale ceramsite and sludge ceramsite, which is spherical or crushed stone in shape, has a particle size of less than 15mm, and a bulk density of 600-3The cylinder pressure strength is more than 4.0 MPa.
In some embodiments of the invention, the ceramic sand has a particle size of less than 4.75mm, and the content of the material with a particle size of 0.15-1.18mm is more than 65 wt%.
In some embodiments of the present invention, the pumping aid is composed of a polycarboxylic acid water reducing agent, a retarder, an air entraining agent, maltodextrin and water, and the air entraining agent is a fatty alcohol sulfonate type air entraining agent.
In some embodiments of the invention, the pumping aid is purchased from Jiangsu Subo New materials Co., Ltd, model SBT-A, and consists of a polycarboxylate water reducer, a retarder, an air entraining agent, maltod mutextrin and water, wherein the air entraining agent is a fatty alcohol sulfonate type air entraining agent.
In some embodiments of the invention, the cellulosic fibers have a length of 20 to 45mm and a linear density of 600 tex.
In some embodiments of the invention, the abrasive agent comprises sodium benzenesulfonate, 1, 2-dichloroethylene, nano calcium carbonate.
In some embodiments of the invention, the nano calcium carbonate has a BET specific surface area of 40 to 55m2/g。
In some embodiments of the invention, the abrasive comprises sodium benzenesulfonate: 1, 2-dichloroethylene: nano calcium carbonate is 1:2: 1.5.
In some embodiments of the invention, the viscosity modifier is selected from at least one of hydroxypropyl methylcellulose, re-dispersible latex powder.
In some embodiments of the invention, the weight ratio of hydroxypropyl methylcellulose to redispersible latex powder in the viscosity modifier is 1: 3.
In some embodiments of the invention, the hydroxypropyl methylcellulose has a 100 mesh pass rate of greater than 100% and a specific gravity of 1.26 to 1.31g/cm3The surface tension of the 2% aqueous solution is 42-50mN/m, and the content of methoxyl exceeds 35%.
In some embodiments of the invention, the redispersible latex powder is terpolymer rubber powder formed by copolymerizing vinyl acetate, acrylic ester and higher fatty acid vinyl ester, the carbonyl content is not less than 40%, and the bulk density is 400-500 g/cm-3The average particle size is 90 μm and the viscosity is more than 2000 pas.
The second aspect of the invention provides a preparation method of the pumping structure ceramsite concrete, which comprises the following steps:
s1, soaking the ceramsite and the ceramic sand in water, and draining until the ceramsite and the ceramic sand are in a saturated surface dry state;
s2, placing the ceramsite and the ceramic sand which are prepared in the step S1 and have a dry saturated surface into a hydrophobic isolation agent for soaking treatment, and then draining until no clear water exists on the surface;
s3, mixing the cellulose fibers, the abrasive, the ceramsite prepared in the step S2 and the ceramic sand according to the formula amount for later use;
s4, mixing cement, fly ash, mineral powder, silica fume and a viscosity regulator according to the formula amount for later use;
s5, mixing the artificial sand, the ceramsite and the ceramic sand prepared in the step S3 and the material prepared in the step S4 according to the formula amount for later use;
and S6, adding a pumping agent and water into the material prepared in the step S5 according to the formula amount, and uniformly stirring to prepare the high-stability pumping structure ceramsite concrete.
In some embodiments of the present invention, in step S2, the weight ratio of polysiloxane to stearic acid in the hydrophobic release agent is (2.5-4): 1, the hydrophobic isolation agent has a sealing effect on pores of the ceramsite, and particularly can reduce the amount of cement slurry entering the inner holes of the ceramsite under the action of pumping pressure, so that the amount of the cement slurry playing a role in wrapping and flowing in concrete is ensured; and secondly, the hydrophobic effect can reduce the absorption amount of the ceramsite to free water in the concrete so as to ensure the workability of the concrete. Too high a ratio by weight of polysiloxane to stearic acid will have a negative effect on the strength of the concrete, and too low a ratio will result in a reduced sealing effect of the holes under the pump pressure.
In some embodiments of the present invention, in the step S1, the soaking time of the ceramsite and the ceramic sand is 24 hours.
In some embodiments of the present invention, in step S2, the hydrophobic separation agent is present at a mass concentration of 10% or less.
In some embodiments of the present invention, in step S2, the mass concentration of the hydrophobic separation agent is 10%.
In some embodiments of the present invention, in the step S2, the soaking time is greater than or equal to 1 h.
In some embodiments of the present invention, in the step S2, the soaking time is 1 h.
In some embodiments of the present invention, the mixing of steps S3-S6 is performed in a double horizontal shaft forced mixer.
As mentioned above, the high-stability pumping structure ceramsite concrete and the preparation method thereof have the following beneficial effects: the invention uses the friction agent and the viscosity regulator to increase the frictional resistance between the ceramsite and the cement slurry through the modification treatment before the ceramsite is used, thereby effectively controlling the serious phenomena of floating and separation of the ceramsite generated in the transportation and pumping processes of the ceramsite concrete; in addition, a small amount of cellulose fiber is added, and the integrity between the ceramsite and the cement paste is kept by utilizing the physical winding effect of the cellulose fiber, so that the concrete has good homogeneity.
If natural sand is not adopted, the existing concrete cannot meet the construction requirement easily, generally, the concrete without the natural sand has poor workability, and the uniformity of the concrete is poor, but the artificial sand used in the invention has special condition requirements, the fineness modulus of the artificial sand is 2.5-2.7, the material with the particle size range of 0.15-0.3mm is not less than 15wt%, the MB value is less than 1.4, and the stone powder content is not more than 7wt%, and the concrete with good workability is prepared under the requirement.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
It should be understood that the processing equipment or devices not specifically mentioned in the following examples are conventional in the art; all pressure values and ranges refer to absolute pressures.
Furthermore, it is to be understood that one or more method steps mentioned in the present invention does not exclude that other method steps may also be present before or after the combined steps or that other method steps may also be inserted between these explicitly mentioned steps, unless otherwise indicated; it is also to be understood that a combined connection between one or more devices/apparatus as referred to in the present application does not exclude that further devices/apparatus may be present before or after the combined device/apparatus or that further devices/apparatus may be interposed between two devices/apparatus explicitly referred to, unless otherwise indicated. Moreover, unless otherwise indicated, the numbering of the various method steps is merely a convenient tool for identifying the various method steps, and is not intended to limit the order in which the method steps are arranged or the scope of the invention in which the invention may be practiced, and changes or modifications in the relative relationship may be made without substantially changing the technical content.
In the following mutexamples, the pumping aid is purchased from Jiangsu Subo New Material Co., Ltd., model SBT-A, and is composed of a polycarboxylic acid water reducing agent, a retarder, an air entraining agent, maltod mutextrin and water, wherein the air entraining agent is a fatty alcohol sulfonate type air entraining agent.
The redispersible latex powder is amber redispersible latex powder purchased from Meixin Hu Pop Biotech Limited.
Sodium benzenesulfonate in the friction agent by weight: 1, 2-dichloroethylene: nano calcium carbonate is 1:2: 1.5.
The weight ratio of the hydroxypropyl methyl cellulose to the redispersible latex powder in the viscosity regulator is 1: 3.
In the following examples, the mass concentration of the hydrophobic release agent is 10%, when the mass concentration is too large, the weight percentage will have a negative effect on the strength of the concrete, when the mass concentration is too small, the soaking time needs to be prolonged to achieve the corresponding optimal effect, and when the mass concentration is 10%, the optimal concentration is determined by experiments.
Of course, as for the water-increasing insulator, a concentration of 10% by mass or less is suitable for the present invention, and is preferably 2 to 10%, more preferably 5 to 10%, more preferably 8 to 10%, and still more preferably 10%.
Example 1
The high-stability pumping structure ceramsite concrete comprises the following raw materials in parts by weight:
100 parts of cement, 18 parts of fly ash, 5 parts of silica fume, 150 parts of artificial sand, 200 parts of ceramsite, 50 parts of ceramic sand, 1.2 parts of pumping aid, 1.4 parts of cellulose fiber, 2.3 parts of friction agent, 0.17 part of viscosity regulator and 55 parts of water.
The preparation method of the concrete in the embodiment comprises the following steps:
s1, soaking the ceramsite and the ceramic sand in water for 24 hours, and draining until the ceramsite and the ceramic sand are in a saturated surface dry state;
s2, placing the ceramsite and the ceramic sand which are saturated and dry in the step S1 into a self-made hydrophobic separation agent solution with the concentration of 10% (the weight ratio of polysiloxane to stearic acid in the hydrophobic separation agent is 2.5:1, the total weight of polysiloxane and stearic acid in the whole water solution accounts for 10%, if the percentage is too large, the negative influence is brought to the strength of concrete, if the percentage is too small, the soaking time needs to be prolonged to achieve the corresponding optimal effect, which is also the optimal concentration determined by experiments), soaking for 1h, and then draining until the surface has no clear water;
s3, placing the ceramsite and the ceramic sand in the step S2 into a stirrer according to the formula amount, adding a friction agent and cellulose fibers, and mixing for 30 seconds for later use;
s4, putting the cement, the fly ash, the silica fume and the viscosity regulator into the stirrer according to the formula amount, and fully stirring and uniformly mixing;
s5, adding the processed ceramsite and artificial sand in the step S3 into the powder uniformly mixed in the step S4 according to the formula amount, and uniformly mixing;
s6, adding all the pumping aid and water accounting for 85% of the total amount by weight into the material obtained in the step S5 according to the formula amount, and uniformly stirring to obtain concrete for later use;
and S7, adding the rest 15% of water into the concrete prepared in the S6 according to the formula amount, and uniformly stirring to prepare the high-stability ceramsite concrete with the pumping structure.
The steps S3-S7 are all carried out by adopting a double horizontal shaft forced mixer in a commercial concrete mixing production line.
Example 2
The high-stability pumping structure ceramsite concrete comprises the following raw materials in parts by weight:
100 parts of cement, 15 parts of fly ash, 10 parts of mineral powder, 5 parts of silica fume, 142 parts of artificial sand, 186 parts of ceramsite, 29 parts of ceramic sand, 1.6 parts of pumping aid, 1.15 parts of cellulose fiber, 1.7 parts of friction agent, 0.16 part of viscosity regulator and 50 parts of water.
The preparation method of the concrete in the embodiment comprises the following steps:
s1, soaking the ceramsite and the ceramic sand in water for 24 hours, and draining until the ceramsite and the ceramic sand are in a saturated surface dry state;
s2, placing the ceramsite and the ceramic sand with the saturated dry surface in the step S1 into a self-made hydrophobic separation agent with the mass concentration of 10% (the weight ratio of polysiloxane to stearic acid in the hydrophobic separation agent is 3:1) to be soaked for 1 hour, and then draining until no clear water exists on the surface;
s3, placing the ceramsite and the ceramic sand in the step S2 into a stirrer according to the formula amount, adding a friction agent and cellulose fibers, and mixing for 30 seconds for later use;
s4, putting the cement, the fly ash, the mineral powder, the silica fume and the viscosity regulator into the stirrer according to the formula amount, and fully stirring and uniformly mixing;
s5, adding the processed ceramsite and artificial sand in the step S3 into the powder uniformly mixed in the step S4 according to the formula amount, and uniformly mixing;
s6, adding all the pumping aid and water accounting for 85% of the total amount by weight into the material obtained in the step S5 according to the formula amount, and uniformly stirring to obtain concrete for later use;
and S7, adding the rest 15% of water into the concrete prepared in the S6 according to the formula amount, and uniformly stirring to prepare the high-stability ceramsite concrete with the pumping structure.
The steps S3-S7 are all carried out by adopting a double horizontal shaft forced mixer in a commercial concrete mixing production line.
Example 3
The high-stability pumping structure ceramsite concrete comprises the following raw materials in parts by weight:
100 parts of cement, 15 parts of fly ash, 20 parts of mineral powder, 8 parts of silica fume, 136 parts of artificial sand, 155 parts of ceramsite, 1.9 parts of pumping aid, 0.95 part of cellulose fiber, 1.3 parts of friction agent, 0.11 part of viscosity regulator and 40.5 parts of water.
The preparation method of the concrete in the embodiment comprises the following steps:
s1, soaking the ceramsite in water for 24 hours, and then draining until the ceramsite is in a saturated surface dry state;
s2, soaking the ceramsite in the saturated dry surface state in the step S1 in a self-made hydrophobic separation agent with the mass concentration of 10% (the weight ratio of polysiloxane to stearic acid in the hydrophobic separation agent is 3.5:1) for 1 hour, and then draining until no clear water exists on the surface;
s3, putting the ceramsite in the step S2 into a stirrer according to the formula amount, adding a friction agent and cellulose fibers, mixing, and stirring for 30 seconds for later use;
s4, putting the cement, the fly ash, the mineral powder, the silica fume and the viscosity regulator into the stirrer according to the formula amount, and fully stirring and uniformly mixing;
s5, adding the processed ceramsite and artificial sand in the step S3 into the powder uniformly mixed in the step S4 according to the formula amount, and uniformly mixing;
s6, adding all the pumping aid and water accounting for 85% of the total amount by weight into the material obtained in the step S5 according to the formula amount, and uniformly stirring to obtain concrete for later use;
and S7, adding the rest 15% of water into the concrete prepared in the S6 according to the formula amount, and uniformly stirring to prepare the high-stability ceramsite concrete with the pumping structure.
The steps S3-S7 are all carried out by adopting a double horizontal shaft forced mixer in a commercial concrete mixing production line.
Example 4
The high-stability pumping structure ceramsite concrete comprises the following raw materials in parts by weight:
100 parts of cement, 10 parts of fly ash, 35 parts of mineral powder, 11 parts of silica fume, 125 parts of artificial sand, 147 parts of ceramsite, 2.1 parts of pumping aid, 0.9 part of cellulose fiber, 1.1 parts of friction agent, 0.09 part of viscosity regulator and 38 parts of water.
The preparation method of the concrete in the embodiment comprises the following steps:
s1, soaking the ceramsite in water for 24 hours, and then draining until the ceramsite is in a saturated surface dry state;
s2, soaking the ceramsite in the saturated dry surface state in the step S1 in a self-made hydrophobic separation agent with the mass concentration of 10% (the weight ratio of polysiloxane to stearic acid in the hydrophobic separation agent is 4:1) for 1 hour, and then draining until the surface is free of water;
s3, putting the ceramsite in the step S2 into a stirrer according to the formula amount, adding a friction agent and cellulose fibers, mixing, and stirring for 30 seconds for later use;
s4, putting the cement, the fly ash, the mineral powder, the silica fume and the viscosity regulator into the stirrer according to the formula amount, and fully stirring and uniformly mixing;
s5, adding the processed ceramsite and artificial sand in the step S3 into the powder uniformly mixed in the step S4 according to the formula amount, and uniformly mixing;
s6, adding all the pumping aid and water accounting for 85% of the total amount by weight into the material obtained in the step S5 according to the formula amount, and uniformly stirring to obtain concrete for later use;
and S7, adding the rest 15% of water into the concrete prepared in the S6 according to the formula amount, and uniformly stirring to prepare the high-stability ceramsite concrete with the pumping structure.
The steps S3-S7 are all carried out by adopting a double horizontal shaft forced mixer in a commercial concrete mixing production line.
Comparative example
The comparative example is conventional structural ceramsite concrete, the formulation of which is shown in table 1 below.
TABLE 1 concrete mix proportion of the comparative examples
In table 1, thickeners: cellulose ether having a viscosity of 10 ten thousand Pa s; artificial sand: common artificial sand with fineness modulus of 2.8-3.1; natural sand: the fineness modulus is 1.1-1.4; the other components are the same as in the examples.
The preparation method comprises the following steps: and (2) soaking the ceramsite and the ceramic sand in water for 24 hours, draining until the ceramsite and the ceramic sand are in a saturated surface dry state, and then mixing the ceramsite and the ceramic sand with other components to obtain the ceramsite concrete with the conventional structure.
Table 2 shows the performance test results of the pumping structure ceramsite concrete prepared by the examples and the comparative examples
From table 2, it can be found that the high-stability pumping structure ceramsite concrete prepared by adding fibers, a friction agent and a hydrophobic isolation agent to soak ceramsite and ceramic sand has significantly improved pumping performance, and particularly, the lower the stratification degree and the pressure bleeding rate of the concrete before and after being pumped, the better the integrity between the ceramsite and slurry in the concrete is, the less the separation is, the whole concrete forms a continuous fluid substance with mortar wrapping coarse aggregate, which guarantees pumping and avoids pipe blockage in the pumping process.
In conclusion, the pumping aid, the friction agent and the viscosity regulator are reasonably added, and the hydrophobic isolation agent is adopted to soak the ceramsite and the ceramic sand, so that the technical problems that the ceramsite is easy to float, delaminate and segregate, is difficult to pump and the like in the production, transportation and pumping processes of the ceramsite concrete are effectively solved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. The high-stability pumping structure ceramsite concrete is characterized by comprising the following raw materials in parts by weight: 100 parts of cement, 10-25 parts of fly ash, 0-35 parts of mineral powder, 5-12 parts of silica fume, 160 parts of artificial sand, 200 parts of ceramsite 145-containing, 0-60 parts of ceramic sand, 1.0-2.2 parts of pumping agent, 0.8-1.5 parts of cellulose fiber, 1-2.5 parts of friction agent, 0.08-0.18 part of viscosity regulator and 38-55 parts of water; the friction agent comprises sodium benzenesulfonate, 1, 2-dichloroethylene and nano calcium carbonate, wherein the sodium benzenesulfonate in the friction agent comprises the following components in parts by weight: 1, 2-dichloroethylene: nano calcium carbonate =1:2: 1.5; the viscosity regulator comprises hydroxypropyl methyl cellulose and redispersible emulsion powder.
2. The pumping structure ceramsite concrete according to claim 1, wherein: the feed comprises the following raw materials in parts by weight: 100 parts of cement, 10-18 parts of fly ash, 20-30 parts of mineral powder, 5-11 parts of silica fume, 150 parts of artificial sand 125-containing materials, 200 parts of ceramsite 147-containing materials, 0-50 parts of ceramic sand, 1.2-2.1 parts of pumping agent, 0.9-1.4 parts of cellulose fiber, 1.1-2.3 parts of friction agent, 0.09-0.17 part of viscosity regulator and 38-55 parts of water.
3. The pumping structure ceramsite concrete according to claim 1 or 2, wherein: the fineness modulus of the artificial sand is 2.5-2.7, the material with the particle size range of 0.15-0.3mm is not less than 15wt%, the MB value is less than 1.4, and the content of the stone powder is not more than 7 wt%.
4. The pumping structure ceramsite concrete according to claim 1 or 2, wherein: the pumping agent is purchased from Jiangsu Subo New materials Co., Ltd, model SBT-A.
5. The pumping structure ceramsite concrete according to claim 1, wherein: the BET specific surface area of the nano calcium carbonate is 40-55m2/g。
6. The pumping structure ceramsite concrete according to claim 1 or 2, wherein: the weight ratio of the hydroxypropyl methyl cellulose to the redispersible latex powder in the viscosity regulator is 1: 3.
7. The pumping structure ceramsite concrete according to claim 1 or 2, wherein: the cement is 42.5 ordinary portland cement;
and/or the fly ash is I-grade fly ash;
and/or the mineral powder is S95 mineral powder;
and/or the materials with the fineness less than 1 mu m in the silica fume account for more than 80wt%, and the average particle size is 0.1-0.3 mu m;
and/or the ceramsite is at least one of clay ceramsite, fly ash ceramsite, shale ceramsite and sludge ceramsite;
and/or the cellulose fibres have a length of 20-45mm and a linear density of 600 tex.
8. The method for preparing ceramsite concrete with pumping structure according to any one of claims 1-7, characterized by comprising the following steps:
s1, soaking the ceramsite and the ceramic sand in water, and draining until the ceramsite and the ceramic sand are in a saturated surface dry state;
s2, placing the ceramsite and the ceramic sand which are prepared in the step S1 and have a dry saturated surface into a hydrophobic isolation agent for soaking treatment, and then draining until no clear water exists on the surface; the weight ratio of polysiloxane to stearic acid in the hydrophobic release agent is (2.5-4): 1;
s3, mixing the cellulose fibers, the abrasive, the ceramsite prepared in the step S2 and the ceramic sand according to the formula amount for later use;
s4, mixing cement, fly ash, mineral powder, silica fume and a viscosity regulator according to the formula amount for later use;
s5, mixing the artificial sand, the ceramsite and the ceramic sand prepared in the step S3 and the material prepared in the step S4 according to the formula amount for later use;
and S6, adding a pumping agent and water into the material prepared in the step S5 according to the formula amount, and uniformly stirring to prepare the high-stability pumping structure ceramsite concrete.
9. The method of claim 8, wherein: in the step S1, the soaking time of the ceramsite and the ceramic sand is 24 hours;
and/or in the step S2, the mass concentration of the hydrophobic separation agent is less than or equal to 10%;
and/or in the step S2, the soaking time is more than or equal to 1 h;
and/or the stirring of the steps S3-S6 is carried out in a double horizontal shaft forced stirrer.
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