CN111689726A - Ultrahigh-pressure long-distance pumping concrete and preparation method thereof - Google Patents
Ultrahigh-pressure long-distance pumping concrete and preparation method thereof Download PDFInfo
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- CN111689726A CN111689726A CN202010550527.7A CN202010550527A CN111689726A CN 111689726 A CN111689726 A CN 111689726A CN 202010550527 A CN202010550527 A CN 202010550527A CN 111689726 A CN111689726 A CN 111689726A
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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
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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
Abstract
The invention discloses ultrahigh-pressure long-distance pumping concrete and a preparation method thereof, belonging to the technical field of concrete and comprising the following compositions in parts by weight: coarse aggregate 1183-1214 parts, fine aggregate 624-743 parts, cement 500-550 parts, water 216-280 parts, fly ash 50-80.8 parts, pumping aid 15-16.5 parts, silicon carbide powder 20-30 parts, expanding agent 55-60 parts, high-efficiency retarding water reducer 11-13 parts, and pumping aid comprising sulfonated melamine high-efficiency water reducer 320-328 parts and hydroxypropyl methylcellulose 2-3.5 parts; the ultrahigh-pressure long-distance pumping concrete and the preparation method thereof solve the problems that the concrete is easy to cause the blockage of a delivery pipe, the segregation and water seepage of the concrete and the influence on the engineering quality and progress due to the large resistance of the pumping pipe, and have the advantages of reducing the resistance of the concrete during pumping and being beneficial to the pumping in an ultra-long distance.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to ultrahigh-pressure long-distance pumping concrete and a preparation method thereof.
Background
In some occasions limited by topographic and geographic environmental factors, such as diversion tunnels, the transfer pump cannot transport the concrete into the tunnel due to long construction occupation, small tunnel excavation molding section and steep mountain along the tunnel, so that the material is difficult to transfer and stack, and the concrete is not convenient to stir and prepare along the construction way, so that the concrete needs to be stirred and then pumped to a construction site.
The invention patent with the publication number of CN107572963B discloses a concrete and a preparation process thereof, wherein the concrete comprises the following components in parts by weight: cement 300-; sand 490-590 parts; 850 portions of stone 725; 85-100 parts of fly ash; 58-78 parts of slag; 1-3 parts of a polycarboxylic acid water reducing agent; 0.5-1.5 parts of an expanding agent; 5-10 parts of a fiber mixture; 0.5-1.2 parts of additive; 130 portions and 160 portions of water; the cement is P.O42.5 cement; the fiber mixture comprises at least two of glass fiber, steel fiber and carbon fiber; the additive comprises at least three of N, N-dimethylethanolamine, triethanolamine, octadecyl isocyanate, anhydrous sodium sulfate and sodium acetate. The invention has the advantage of excellent early compressive strength.
According to the invention, the water reducing agent is used for increasing the strength of the concrete, but no retarder is added, so that the initial setting time of the concrete is shortened while the strength is enhanced, the concrete begins to be condensed when being conveyed in a conveying pipe for a long distance, the resistance of the pumping pipe is gradually increased, the conveying pipe is easily blocked, and the engineering quality and progress are influenced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the ultrahigh-pressure long-distance pumping concrete, which reduces the resistance of the concrete during pumping and is beneficial to the pumping in an ultra-long distance.
In order to achieve the purpose, the invention provides the following technical scheme:
the ultrahigh-pressure long-distance pumping concrete comprises the following compositions in parts by weight: coarse aggregate 1183-1214 parts, fine aggregate 624-743 parts, cement 500-550 parts, water 216-280 parts, fly ash 50-80.8 parts and pumping agent 15-16.5 parts, wherein the pumping agent comprises hydroxypropyl methylcellulose 2-3.5 parts and sulfonated melamine high-efficiency water reducing agent 320-328 parts.
By adopting the technical scheme, the coarse aggregate and the fine aggregate are used as basic aggregates to provide strength support for concrete, the fly ash, the cement and the water are mixed to form a gel mixture with strong cohesiveness, and the gel mixture and the aggregates are uniformly mixed and tightly bonded to form the concrete.
The hydroxypropyl methyl cellulose solution is coated on the surfaces of the aggregate, the cement and the fly ash to form a sticky and slippery film layer, so that the cementing and lubricating effects are achieved, the lubricating property between concrete and a pipeline is enhanced, the resistance of the pipeline to the concrete is reduced, and the possibility that the concrete is stuck in the pipeline is reduced.
Meanwhile, as the hydroxypropyl methyl cellulose is cohered on the surface of the concrete to form a sticky and slippery film, the surface energy of the concrete is reduced, and gas can enter the interior of the concrete in the stirring process, so that a proper amount of bubbles are introduced into the concrete. Hydroxypropyl methylcellulose is attached to the surface of the air bubbles, so that the air bubbles can be adhered to solid particles to slow down subsidence, simultaneously, the separation of slurry and aggregate is prevented, the possibility of bleeding and segregation of concrete is reduced, the internal cohesion of the concrete is improved, the pumping process is reduced, slurry is rapidly conveyed away due to pumping pressure, the aggregate is retained in a pump pipe, and the phenomenon of pump blockage and pipe blockage due to the lubricating effect of the slurry is avoided.
Due to the 'ball effect' of the bubbles, the friction force between the concrete and the pipeline is further reduced, so that the fluidity of the concrete mixture is improved, and the possibility of pipeline blockage is reduced. The air bubbles are generated, so that the water consumption is reduced, the water-cement ratio of the concrete is reduced, the strength and the compactness of the concrete are improved, and the durability of the concrete is improved.
Hydroxypropyl methyl cellulose and sulfonated melamine high-efficiency water reducing agent are compounded, molecular chains of the hydroxypropyl methyl cellulose and the sulfonated melamine high-efficiency water reducing agent are mutually wound to promote polar groups to adsorb a large amount of cement particles, solid-liquid-gas three-phase bubbles are formed with the bubbles, and the surface thickness of film-type bubbles covered by the solid particles is increased, so that the mechanical strength and elasticity of the bubbles are increased, the possibility of bubble breakage is reduced, the tiny bubbles are prevented from being increased simultaneously, the bubble diameter of the introduced bubbles is smaller, the formed small bubbles are kept to be uniformly distributed and stably constructed, the friction force between the small bubbles and a pipeline is reduced, the strength of concrete is ensured, and the slump retentivity of the concrete is.
Preferably, the composition also comprises 20-30 parts of silicon carbide powder and 8-13 parts of octadecyl dimethyl benzyl ammonium chloride.
By adopting the technical scheme, the silicon carbide powder has good heat-conducting property and good adhesion to aggregate, and can be uniformly and stably dispersed in concrete, and the molecular branched chain of the hydroxypropyl methyl cellulose extends into pores of the silicon carbide powder to connect the silicon carbide with the aggregate, so that the silicon carbide is more uniformly and stably dispersed in and out of the concrete.
Octadecyl dimethyl benzyl ammonium chloride is used as a cationic surfactant and at least contains a long-chain hydrophobic group and a hydrophilic group with positive charge. The surface of the silicon carbide powder contains polar groups, and can adsorb water molecules to surround the surface of the silicon carbide powder, so that one end of octadecyl dimethyl benzyl ammonium chloride with a hydrophilic group is connected with the surface of the silicon carbide powder, one end of the octadecyl dimethyl benzyl ammonium chloride with a hydrophobic group extends out of a sticky and slippery film formed by hydroxypropyl methyl cellulose, and the sticky and slippery film formed by the hydroxypropyl methyl cellulose is punctured to form a plurality of heat dissipation holes. So as to timely dissipate the hydration heat in the concrete through the silicon carbide powder and the heat dissipation holes and reduce the temperature difference between the inside and the outside of the concrete, thereby reducing the possibility of surface cracks caused by severe contraction of the concrete.
Further, the composition also comprises 55-60 parts of an expanding agent and 11-13 parts of a high-efficiency retarding water reducing agent.
By adopting the technical scheme, after the concrete is conveyed to a construction site, the expanding agent can be used for bonding the fly ash to fully permeate and fill in gaps among the cement when the concrete is solidified and hardened, and then the expanding agent expands in volume to play a role in compensating shrinkage and tensioning the steel bars to generate prestress and fully fill the gaps among the cement, so that the strength and the impermeability of the concrete are improved.
The high-efficiency retarding water reducer further prolongs the initial setting time of concrete, reduces the water consumption and enhances the strength of the concrete.
Further, the cement is P.C 32.5.5 grade cement.
By adopting the technical scheme, the P.C 32.5.5-grade cement has low early strength but good heat resistance. The concrete prepared by mixing the fly ash and the fly ash has stable early and later strength, low hydration heat and low possibility of cracking.
Further, the coarse aggregate is crushed stone with 5-20mm continuous gradation.
By adopting the technical scheme, the larger the particle size of the coarse aggregate is, the smaller the specific surface area is, the smaller the porosity is, the cement and water consumption can be saved, and the compactness, impermeability and strength of the concrete are improved. However, the larger the particle size of the coarse aggregate is, the faster the particles sink during mixing, which causes uneven distribution of particles inside the concrete and affects the strength of the hardened concrete. The hydroxypropyl methyl cellulose can reduce the possibility that the sinking speed of the particles is higher in the mixing process, so that the strength of the hardened concrete is more excellent.
Further, the fly ash is class II fly ash.
By adopting the technical scheme, the fineness of the class II fly ash is smaller, the water requirement is less, the class II fly ash can be fully dispersed and filled in gaps of cement particles after being doped into concrete, the slurry is more compact, and Ca (OH) generated after the fly ash hydrates the cement2Has stronger absorption force, forms well-developed calcium silicate gel, enhances the cohesive force of concrete, and reduces the possibility of concrete segregation and water infiltration.
The second purpose of the invention is to provide a preparation method of the ultrahigh-pressure long-distance pumping concrete, which comprises the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: mixing cement and fly ash uniformly, adding the rest water, and stirring uniformly to obtain a gel mixture;
s 4: and adding the pumping agent and the gel mixture into the aggregate mixture while stirring, and continuously stirring for 10min after uniformly stirring to obtain the ultrahigh-pressure long-distance pumping concrete.
By adopting the steps, the aggregates are mixed more uniformly, the coal ash can be uniformly adhered and gathered in the concrete by the hydroxypropyl methylcellulose, the prepared concrete has small friction force with the pumping pipe on the basis of keeping the strength, the pumping pipe is not easy to block, and the concrete has high strength and impermeability, and is good in workability and water retention.
Further, the preparation method of the ultrahigh-pressure long-distance pumping concrete comprises the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: uniformly mixing silicon carbide powder, cement and fly ash, adding octadecyl dimethyl benzyl ammonium chloride and the rest water under stirring, and uniformly stirring to obtain a gel mixture;
s 4: and adding the pumping agent and the gel mixture into the aggregate mixture while stirring, and continuously stirring for 10min after uniformly stirring to obtain the ultrahigh-pressure long-distance pumping concrete.
By adopting the steps, the silicon carbide powder can be uniformly mixed in the concrete, and the silicon carbide powder is punctured into a plurality of heat dissipation holes on the viscous and smooth film formed by the hydroxypropyl methyl cellulose, so that the hydration heat in the concrete is dissipated in time, the temperature difference between the inside and the outside of the concrete is reduced, and the possibility of surface cracks caused by severe shrinkage of the concrete is reduced.
Further, the preparation method of the ultrahigh-pressure long-distance pumping concrete comprises the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: uniformly mixing silicon carbide powder, cement and fly ash, adding octadecyl dimethyl benzyl ammonium chloride and the rest water under stirring, and uniformly stirring to obtain a gel mixture;
s 4: and adding the pumping aid and the gel mixture into the aggregate mixture while stirring, uniformly stirring, adding the expanding agent and the high-efficiency retarding water reducing agent, uniformly stirring, and continuously stirring for 10min to obtain the ultrahigh-pressure long-distance pumping concrete.
By adopting the steps, the expanding agent and the high-efficiency retarding water reducing agent are added finally, so that the initial setting time of the concrete is prolonged, the water consumption is reduced, the strength of the concrete is enhanced, the volume of the concrete is expanded when the concrete is set, the effects of compensating shrinkage and tensioning the reinforcing steel bars to generate prestress and fully filling cement gaps are achieved, and the strength and the impermeability of the concrete are improved.
In conclusion, the invention has the following beneficial effects:
1. the hydroxypropyl methyl cellulose and the sulfonated melamine high-efficiency water reducing agent are compounded and coated on the surfaces of aggregate, cement and fly ash together to form a sticky and slippery film layer and a bubble layer, so that the cementing and lubricating effects are achieved, the lubricating property between concrete and a pipeline is enhanced, the resistance of the pipeline to the concrete is reduced, and the possibility that the pipeline is blocked when the concrete is stuck in the pipeline is reduced;
2. the silicon carbide powder and the octadecyl dimethyl benzyl ammonium chloride act together, so that the hydration heat in the concrete can be timely dissipated, and the temperature difference between the inside and the outside of the concrete is reduced, so that the possibility of surface cracks caused by severe shrinkage of the concrete is reduced;
3. the concrete prepared by the concrete preparation method is not easy to separate and seep into water, has small friction with the pumping pipe, is not easy to block the pumping pipe, and has high strength, impermeability, workability and water retention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The specification and purchase information of the raw materials and components related to the present invention are shown in table 1.
Table 1 specification and purchase information for raw materials and components
| Name (R) | Model number | Manufacturer of the product |
| Coarse aggregate (self-made macadam) | 5-20mm continuous gradation | / |
| Fine aggregate (Changjiang river extra fine sand) | Fineness modulus 2.7 | / |
| Cement | P.C 32.5 | Fair liability company of wingdong cement jade |
| Fly ash | Class F class II | Sichuan Jianhong building materials Co Ltd |
| Sulfonated melamine high-efficiency water reducing agent | AR | CHONGQING SHIBOSHI NEW MATERIAL Co.,Ltd. |
| Hydroxypropyl methylcellulose | HPMC | Chengdu-Zhenghui chemical Co Ltd |
| Silicon carbide | 6 mesh | Xiamen guangdoctor photoelectric Co.,Ltd. |
| Expanding agent | AR | Hubei Ferry chemical Co., Ltd |
| High-efficiency retarding water reducing agent | JHF7 | Wuhan La Na Bai pharmaceutical chemical Co Ltd |
| Octadecyl dimethyl benzyl ammonium chloride | AR | CHONGQING SHIBOSHI NEW MATERIAL Co.,Ltd. |
The coarse aggregates are 5-20mm continuous graded broken stones, and the apparent density is 2710kg/m3, the bulk density is 1623kg/m3, the void ratio is 38%, the mud content is 0.3% and meets the standard of the broken stones for buildings according to the detection of GB/T14685-2011 pebble and broken stone for buildings.
The fine aggregate is specially fine sand purchased from Yangtze river in the market, the apparent density of the sand in a detection mechanism is 2610kg/m3, the loose bulk density of the sand is 1583kg/m3, the void ratio is 29 percent, the mud content is 1 percent according to GB/T14684-2011 building sand, and the sand in the detection mechanism is spherical particles, does not have a sheet shape and is tightly cohered with the broken stone under the adhesion of a gel material.
The cement of the present application is a commercially available P.C 32.5.5 grade cement; the source of the swelling agent is Hubei ferry chemical company, Inc., under the product number 30552573787.
Example (b):
table 2 shows the components and proportions of the ultra-high pressure long-distance pumping concrete in each example.
Table 2 Components and proportions of ultra-high pressure long-distance pumping concrete in each example
The preparation and procedure of examples 1-5 are as follows:
s 1: under the condition of continuously stirring at 25-30 ℃, according to the proportion shown in table 2, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hypromellose into the sulfonated melamine high-efficiency water reducing agent solution for multiple times for dissolving, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate according to the mixture ratio of the table 2 to obtain an aggregate mixture;
s 3: according to the proportion shown in the table 2, cement and fly ash are mixed uniformly, the rest water is added, and the mixture is stirred uniformly to obtain a gel mixture;
s 4: according to the proportion shown in the table 2, the pumping aid and the gel mixture are added into the aggregate mixture while stirring, and after the mixture is uniformly stirred, the mixture is continuously stirred for 10min to obtain the ultrahigh-pressure long-distance pumping concrete.
The preparation and procedure of examples 6 to 7 differ from example 1 in that:
the step of preparing the gel mixture is that, according to the mixture ratio of table 2, silicon carbide powder, cement and fly ash are mixed uniformly, octadecyl dimethyl benzyl ammonium chloride and the rest water are added under stirring, and the gel mixture is obtained after uniform stirring;
the preparation and procedure of examples 8 to 10 differ from example 6 in that:
when the step of preparing the ultrahigh-pressure long-distance pumping concrete is carried out, the pumping agent and the gel mixture are added into the aggregate mixture while stirring according to the mixture ratio shown in the table 2, the mixture is uniformly stirred, the expanding agent and the high-efficiency retarding water reducing agent are added according to the mixture ratio shown in the table 2, the mixture is uniformly stirred, and the stirring is continued for 10min, so that the ultrahigh-pressure long-distance pumping concrete is obtained.
The performance test method of the ultra-high pressure long-distance pumping concrete prepared in the above examples 1 to 10 is as follows:
slump: and (3) respectively testing the slump of the concrete mixture when the concrete mixture is taken out of the machine and after 2 hours according to GB/T50080-2016 standard of the performance test method of the common concrete mixture.
Strength: and (3) manufacturing a standard test block according to GB/T50081-2002 Standard of mechanical property test methods of common concrete, and measuring the compressive strength of the standard test block after being maintained for 7 days and 28 days.
Isolation rate: the segregation rate of the concrete mixture is tested according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Water seepage rate under pressure: the water leaching rate of the concrete mixture is tested according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Rewinding time: the drum pouring time (emptying time) of the concrete mixture is tested according to GB/T50080-2016 Standard test method for Performance of common concrete mixtures.
Initial setting time: the initial setting time of the concrete mixture is tested according to GB/T50080-2016 Standard test method for the Performance of common concrete mixtures.
Temperature difference: and (3) continuously detecting the poured concrete delivered within 7 days according to GB/T50108 'underground engineering waterproof technical regulation', and testing the absolute value of the maximum temperature difference between the inside and the outside of the concrete.
The performance test results of the ultra-high pressure long distance pumping concrete prepared by the above examples are shown in table 3.
Table 3 shows the performance test results of the ultra-high pressure long distance pumping concrete prepared in each example.
Table 3 performance test results of ultra-high pressure long distance pumping concrete prepared in each example
From the test results in table 3, it can be seen that:
the ultrahigh-pressure long-distance pumped concrete prepared according to the proportion of the embodiment meets the indexes of the workability, the mechanical property and the durability of the pumped concrete, and the difference between the slump and the machine-out slump after 2 hours is small, which indicates that the prepared concrete has small loss with time and is beneficial to pumping. The concrete has the strength of C80 concrete while ensuring the pumping performance.
Comparative example
The proportion of each proportional component is shown in Table 4
TABLE 4 respective proportional components and proportions
Comparative example 1 compared to example 1 no pumping agent was added;
comparative example 2 compared to example 1, hypromellose was not added to the pumping agent;
compared with the pumping agent of the embodiment 1, the pumping agent of the comparative example 3 is not added with the high-efficiency retarding water reducing agent;
the concrete prepared according to each of the above comparative examples was prepared in the same manner as in the examples, and the concrete prepared according to each of the above comparative examples was tested in the same manner as in the examples, and the test results are shown in Table 5.
Table 5 results of performance test of ultra-high pressure long distance pumping concrete prepared in each proportion
As can be seen from the above data, the concrete produced when no pumping agent was present was inferior in both impermeability and strength compared to example 1; when the pumping agent only contains the sulfonated melamine high-efficiency water reducing agent, the impermeability of the prepared concrete is not as good as that of the concrete prepared in the embodiment 1; when the pumping agent contained only hydroxypropyl methylcellulose, the strength of the concrete produced was not as good as that of example 1.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The ultrahigh-pressure long-distance pumping concrete is characterized by comprising the following compositions in parts by weight: coarse aggregate 1183-1214 parts, fine aggregate 624-743 parts, cement 500-550 parts, water 216-280 parts, fly ash 50-80.8 parts and pumping agent 15-16.5 parts, wherein the pumping agent comprises hydroxypropyl methylcellulose 2-3.5 parts and sulfonated melamine high-efficiency water reducing agent 320-328 parts.
2. The ultra-high pressure long-haul pumped concrete of claim 1, wherein the composition further comprises 20-30 parts of silicon carbide powder and 8-13 parts of octadecyl dimethyl benzyl ammonium chloride.
3. The ultra-high pressure long-distance pumping concrete according to claim 2, further comprising 55-60 parts of an expanding agent and 11-13 parts of a high efficiency retarding and water reducing agent.
4. The ultra-high pressure long-distance pumped concrete of claim 1, wherein said cement is grade P.C 32.5.5 cement.
5. The ultra-high pressure long distance pumping concrete according to claim 1, wherein the coarse aggregate is crushed stone of 5-20mm continuous gradation.
6. The ultra-high pressure long-distance pumping concrete according to claim 1, wherein the fly ash is class II fly ash.
7. The method for preparing the ultra-high pressure long-distance pumping concrete according to claim 1, which is characterized by comprising the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: mixing cement and fly ash uniformly, adding the rest water, and stirring uniformly to obtain a gel mixture;
s 4: and adding the pumping agent and the gel mixture into the aggregate mixture while stirring, and continuously stirring for 10min after uniformly stirring to obtain the ultrahigh-pressure long-distance pumping concrete.
8. The method for preparing the ultra-high pressure long-distance pumping concrete according to claim 2, which is characterized by comprising the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: uniformly mixing silicon carbide powder, cement and fly ash, adding octadecyl dimethyl benzyl ammonium chloride and the rest water under stirring, and uniformly stirring to obtain a gel mixture;
s 4: and adding the pumping agent and the gel mixture into the aggregate mixture while stirring, and continuously stirring for 10min after uniformly stirring to obtain the ultrahigh-pressure long-distance pumping concrete.
9. The method for preparing the ultra-high pressure long-distance pumping concrete according to claim 3, which is characterized by comprising the following steps:
s 1: under the condition of continuously stirring at 25-30 ℃, taking half of water, completely dissolving the sulfonated melamine high-efficiency water reducing agent in the water, slowly adding a small amount of hydroxypropyl methylcellulose into the sulfonated melamine high-efficiency water reducing agent solution for dissolving for many times, and uniformly stirring to obtain a pumping agent;
s 2: uniformly mixing the coarse aggregate and the fine aggregate to obtain an aggregate mixture;
s 3: uniformly mixing silicon carbide powder, cement and fly ash, adding octadecyl dimethyl benzyl ammonium chloride and the rest water under stirring, and uniformly stirring to obtain a gel mixture;
s 4: and adding the pumping aid and the gel mixture into the aggregate mixture while stirring, uniformly stirring, adding the expanding agent and the high-efficiency retarding water reducing agent, uniformly stirring, and continuously stirring for 10min to obtain the ultrahigh-pressure long-distance pumping concrete.
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| CN115724624A (en) * | 2022-08-21 | 2023-03-03 | 广东派安建材有限公司 | Anti-segregation premixed pump concrete and preparation process thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113929405A (en) * | 2021-11-30 | 2022-01-14 | 广西金汇通混凝土有限公司 | Ultrahigh-strength pumping concrete and preparation method thereof |
| CN115724624A (en) * | 2022-08-21 | 2023-03-03 | 广东派安建材有限公司 | Anti-segregation premixed pump concrete and preparation process thereof |
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