CN111732390B - Non-dispersed machine-made sand self-compacting concrete for underwater pile foundation and preparation method thereof - Google Patents
Non-dispersed machine-made sand self-compacting concrete for underwater pile foundation and preparation method thereof Download PDFInfo
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
- C04B20/008—Micro- or nanosized fillers, e.g. micronised fillers with particle size smaller than that of the hydraulic binder
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/38—Polysaccharides or derivatives thereof
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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
- C04B2111/74—Underwater applications
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Nanotechnology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
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Abstract
The invention discloses a non-dispersed machine-made sand self-compacting concrete for an underwater pile foundation and a preparation method thereof, wherein the concrete comprises the following components in percentage by mass: 17.70-20.58 parts of cement, 0.82-1.65 parts of nano-scale spherical siliceous powder, 2.47-3.70 parts of micron-scale spherical siliceous powder, 0.82-2.06 parts of high-activity silica-calcium powder, 0.21-0.82 part of high-glycan composite flocculant, 32.90-36.76 parts of machine-made broken stone, 28.88-32.29 parts of machine-made sand, 0.49-0.62 part of slow-setting polycarboxylic acid admixture and 8.02-8.64 parts of water. Meanwhile, the content of suspended matters and the pH value in the nondispersive performance index both meet the index requirements of the nondispersive concrete.
Description
Technical Field
The invention relates to a non-dispersed machine-made sand self-compacting concrete for an underwater pile foundation and a preparation method thereof, belonging to the field of building materials.
Background
The geology of southwest area of China is complex, and great difficulty exists in the construction process of important projects such as airports, expressways, high-rise buildings and the like. Particularly, in the underwater pile foundation construction, an unstable layer, a karst cave and underground water enrichment exist in a pile foundation construction area, and particularly under the condition of flowing water, the concrete is required to have good workability and durability, and simultaneously, the concrete is required to have good underwater dispersion resistance.
Disclosure of Invention
The invention aims to solve the problems that the prior art has poor dispersibility resistance and insufficient durability of the underwater pile foundation machine-made sand self-compacting concrete under the condition of flowing water. The method is suitable for underwater pile foundation concrete construction with flowing water and 0-70m long construction time of not more than 20 hours.
The purpose of the invention is realized by the following technical scheme: the utility model provides an underwater pile foundation does not disperse quick-witted system sand self-compaction concrete, this concrete each component's mass ratio is: 17.70-20.58 parts of cement, 0.82-1.65 parts of nano-scale spherical siliceous powder, 2.47-3.70 parts of micron-scale spherical siliceous powder, 0.82-2.06 parts of high-activity calcium silicate powder, 0.21-0.82 part of high-glycan composite flocculant, 32.90-36.76 parts of machine-made broken stone, 28.88-32.29 parts of machine-made sand, 0.49-0.62 part of retarding polycarboxylic acid admixture and 8.02-8.64 parts of water.
Further, the cement is ordinary portland cement P.O42.5 and ordinary portland cement P.O52.5, and the specific surface area is 300-2The initial setting time is more than or equal to 200min, the final setting time is less than or equal to 300min, and the water consumption of the standard consistency is less than or equal to 26.0 percent.
Furthermore, the nano-scale spherical silica powder is high-activity ultrafine powder with specific surface area of 18000-22000m2The strength and activity of the water/kg and 28d is more than or equal to 120 percent, and the water demand ratio is less than or equal to 100 percent.
Furthermore, the micron-sized spherical silica powder is active spherical micro-powder, and the water demand ratio is less than or equal to 100 percent. Specific surface area 380-450m2/kg。
Further, the high-activity calcium silicate mineral powder is one of phosphorus slag powder and iron ore powder, the water requirement ratio is less than or equal to 100 percent, and the specific surface area is 350-400m2The activity of 28d strength is more than or equal to 80 percent per kg.
Furthermore, the high-polysaccharide composite flocculant comprises 25-80 mass percent of fructan and 20-75 mass percent of glucan, and is a powdery flocculant.
Furthermore, the machine-made broken stone is non-alkali active aggregate, the particle size is 5.0-25.0mm, the machine-made limestone broken stone is continuously graded, the needle flake content is less than or equal to 5.0%, and the mud content is less than or equal to 0.1%.
Furthermore, the machine-made sand is non-alkali active aggregate, the grain size is less than 5.00mm, the machine-made sand is prepared in a continuous grade, the MB value is less than or equal to 1.0, the content of stone powder is more than or equal to 8.0 percent and less than or equal to 10.0 percent, the fineness modulus is more than or equal to 2.4 and less than or equal to 3.1, the screen residue with the grain diameter more than 2.36mm is less than or equal to 25.0 percent, and the mud content is less than or equal to 0.1 percent.
Further, the mass ratio of each component of the retarding polycarboxylic acid admixture is that the saccharide organic retarder: 10-15 parts of polycarboxylic acid water reducing agent, 15-90 parts of rosin air entraining agent and 1-3 parts of rosin air entraining agent, and can ensure that the initial setting time of concrete reaches 10-20h and the plastic retention time is 10-20 h.
The preparation method of the underwater pile foundation non-dispersive machine-made sand self-compacting concrete comprises the following steps:
the method comprises the following steps: weighing cement, nano-scale spherical siliceous powder, micro-scale spherical siliceous powder, high-activity silicocalcareous powder, high-glycan composite flocculant, machine-made broken stone, machine-made sand, delayed coagulation type polycarboxylic admixture and water according to the mass ratio of the components;
step two: fully stirring and mixing the weighed retarding polycarboxylic admixture and water for 2min to obtain a uniform mixed solution;
step three: placing weighed cement, nanoscale spherical siliceous powder, micron-sized spherical siliceous powder, activated calcium silicate mineral powder, machine-made broken stone and machine-made sand in a concrete mixer, and performing dry mixing for 2min to obtain a mixed dry material, then placing the mixed liquid in the mixed dry material to be stirred for 1-2min to obtain a concrete mixture, and finally placing the high-polysaccharide composite flocculant in the stirring concrete mixture to be stirred for 2-3min to obtain the underwater pile foundation non-dispersing machine-made sand self-compacting concrete.
The invention has the beneficial effects that:
compared with the prior art, the concrete setting agent has obvious beneficial effects, and the technical scheme shows that high-quality raw materials are preferably selected, and the indexes of the fineness, the setting time, the standard consistency and the like of the cement are controlled, so that the cement can meet the setting time requirement of the concrete for 10-20 hours under the action of the additive. The subjects were represented as follows:
1. the invention creatively applies the technologies of 'cementing material system collocation technology and aggregate density grading technology' and the like to further realize the excellent performance of the underwater pile foundation machine-made sand self-compacting concrete. The cementing material system matching technology means that in the cementing material system, the fineness of various cementing materials is as follows: the nano-scale spherical siliceous powder is less than the high-activity silicocalcareous powder and less than the micron-scale spherical siliceous powder and less than the cement, the four gelled material particles are mutually filled to form a compact gelled material particle system, and slurry with the apparent density basically equal to that of the aggregate is formed under the action of water and the delayed coagulation polycarboxylic acid additive, so that the aggregate can be uniformly suspended in the slurry. And the high admixture rubber material system is beneficial to the chemical erosion resistance of the concrete, so that the durability of the concrete in a complex underwater environment is ensured.
2. The invention applies aggregate density grading technology, in particular to matching broken stone and machine-made sand, so that the apparent density of a matched aggregate system is maximum, the gap is minimum, the required amount of slurry is reduced, and the surplus slurry can further improve the workability of concrete.
3. The invention utilizes the action principle of the high-glycan composite flocculant to make the surface charge of suspended colloidal particles in concrete lose, become unstable suspended microparticles and then aggregate. In addition, the high-glycan composite flocculant can form flocs through the connection and adsorption of the high-molecular long chains, so that concrete slurry is not dispersed underwater, the underwater forming of concrete is ensured, and the underwater non-dispersibility of concrete is improved.
4. According to the preparation method, the high-glycan composite flocculant is added for stirring after the concrete mixture is obtained, the water reducing effect of the retarding polycarboxylic acid admixture is fully exerted, so that the water among powder particles is released, the workability of the concrete is improved, then the high-glycan composite flocculant is added to be fused with the released water, the mixture is uniformly dispersed in the concrete after being stirred, the whole slurry system of the concrete is coagulated, and the underwater non-dispersibility of the concrete is improved.
The invention is further illustrated by the following specific examples.
Detailed Description
A preparation method of underwater pile foundation machine-made sand self-compacting concrete comprises the following steps:
the method comprises the following steps: weighing cement, nano-scale spherical siliceous powder, micron-scale spherical siliceous powder, high-activity silica-calcia powder, high-glycan composite flocculant, machine-made crushed stone, machine-made sand, retarding polycarboxylic acid admixture and water according to the mass ratio of each component in the examples 1-6;
step two: fully stirring and mixing the weighed retarding polycarboxylic admixture and water for 2min to obtain a uniform mixed solution;
step three: placing weighed cement, nanoscale spherical siliceous powder, micron-sized spherical siliceous powder, activated calcium silicate mineral powder, machine-made broken stone and machine-made sand in a concrete mixer, fully mixing for 2min to obtain a mixed dry material, then placing the mixed solution in the mixed dry material, stirring for 1-2min to obtain a concrete mixture, finally placing the high-polysaccharide composite flocculant in the stirring concrete mixture, and stirring for 2-3min to obtain the underwater pile foundation non-dispersion machine-made sand self-compacting concrete.
The component mass ratios of examples 1 to 6 are as follows:
fresh concrete performance indices for examples 1-6:
as can be seen from the table above, the slump/expansion of 0 hour and 3 hours is good, and the indexes of emptying time of the inverted barrel, T500 and the like all meet the index requirements of the fresh mixing performance of the self-compacting concrete. Meanwhile, the content of suspended matters and the pH value in the nondispersive performance index both meet the index requirements of the nondispersive concrete.
Concrete hardening performance indexes of examples 1 to 6:
as can be seen from the table above, after the concrete is hardened, the 28d strength can reach the C40 strength level, the later strength is continuously increased, and meanwhile, the impermeability level can reach more than P12, so that the concrete can be effectively prevented from being damaged by water and various dissolved salts in the water under complex geological conditions, and the durability of the concrete is effectively improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (2)
1. The utility model provides an underwater pile foundation does not disperse quick-witted system sand self-compaction concrete which characterized in that, the mass ratio of each component of this concrete is: 17.70-20.58 parts of cement, 0.82-1.65 parts of nano-scale spherical siliceous powder, 2.47-3.70 parts of micron-scale spherical siliceous powder, 0.82-2.06 parts of high-activity calcium silicate powder, 0.21-0.82 part of high-glycan composite flocculant, 32.90-36.76 parts of machine-made broken stone, 28.88-32.29 parts of machine-made sand, 0.49-0.62 part of retarding polycarboxylic acid admixture and 8.02-8.64 parts of water;
the cement is ordinary Portland cement P.O42.5 and ordinary Portland cement P.O52.5, and the specific surface area is 300-380m2The initial setting time is more than or equal to 200min, the final setting time is less than or equal to 300min, and the water consumption of the standard consistency is less than or equal to 26.0 percent;
the nano-scale spherical silicon powder is high-activity ultrafine powder with specific surface area of 18000-22000m2The strength and activity of the water/kg, 28d is more than or equal to 120 percent, and the water demand ratio is less than or equal to 100 percent;
the micron-sized spherical siliceous powder is active spherical fine powder, the water demand ratio is less than or equal to 100 percent, and the specific surface area is 380-450m2/kg；
The high-activity calcium silicate mineral powder is one of phosphorus slag powder and iron ore powder, the water demand ratio is less than or equal to 100 percent, and the specific surface area is 350-400m2Per kg, 28d strength activity is more than or equal to 80 percent;
the high-polysaccharide composite flocculant comprises 25-80 mass percent of levan and 20-75 mass percent of glucan, and is a powdery flocculant formed by compounding;
the machine-made broken stone is non-alkali active aggregate, the particle size is 5.0-25.0mm, the machine-made broken stone is continuously graded, the needle-shaped content is less than or equal to 5.0%, and the mud content is less than or equal to 0.1%;
the machine-made sand is non-alkali active aggregate, the grain size is less than 5.00mm, the continuous grade machine-made sand is prepared, the MB value is less than or equal to 1.0, the content of stone powder is less than or equal to 10.0 percent and more than or equal to 8.0 percent, the fineness modulus is less than or equal to 3.1 and more than or equal to 2.4 Mx, the screen residue with the grain size more than 2.36mm is less than or equal to 25.0 percent, and the mud content is less than or equal to 0.1 percent;
the mass ratio of the components of the retarding polycarboxylic admixture is that the saccharide organic retarder: 10-15 parts of polycarboxylic acid water reducing agent, 15-90 parts of rosin air entraining agent and 1-3 parts of rosin air entraining agent, and can ensure that the initial setting time of concrete reaches 10-20h and the plastic retention time is 10-20 h.
2. The method for preparing the non-dispersed machine-made sand self-compacting concrete for the underwater pile foundation according to claim 1, which comprises the following steps:
the method comprises the following steps: weighing cement, nano-scale spherical siliceous powder, micron-scale spherical siliceous powder, high-activity silicocalcareous powder, high-polysaccharide composite flocculant, machine-made crushed stone, machine-made sand, delayed coagulation polycarboxylic admixture and water according to the mass ratio of the components;
step two: fully stirring and mixing the weighed retarding polycarboxylic admixture and water for 2min to obtain a uniform mixed solution;
step three: placing weighed cement, nanoscale spherical siliceous powder, micron-sized spherical siliceous powder, activated calcium silicate mineral powder, machine-made broken stone and machine-made sand in a concrete mixer, and performing dry mixing for 2min to obtain a mixed dry material, then placing the mixed liquid in the mixed dry material to be stirred for 1-2min to obtain a concrete mixture, and finally placing the high-polysaccharide composite flocculant in the stirring concrete mixture to be stirred for 2-3min to obtain the underwater pile foundation non-dispersing machine-made sand self-compacting concrete.
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| CN114436582B (en) * | 2021-12-21 | 2022-09-02 | 中交武汉港湾工程设计研究院有限公司 | Underwater non-dispersible ultrahigh-performance concrete and preparation method thereof |
| CN115677260A (en) * | 2022-10-18 | 2023-02-03 | 中建西部建设(广东)有限公司 | Additive for slow-setting type underwater undispersed concrete and preparation method thereof |
| CN116023048B (en) * | 2023-03-28 | 2023-06-16 | 湖南创速新材料有限公司 | Cement clinker and method for preparing cement by using same |
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| CA2618094A1 (en) * | 2005-09-01 | 2007-03-08 | Sumitomo Osaka Cement Co., Ltd. | Ultrarapid hardening cement composition and dispersant for ultrarapid hardening cement composition |
| CN101289291B (en) * | 2007-04-17 | 2010-04-21 | 中国石油集团工程技术研究院 | Quick coagulation flocculant for anti-washout concrete under water |
| JP2009023901A (en) * | 2007-06-19 | 2009-02-05 | Nippon Shokubai Co Ltd | Cement admixture and cement composition |
| CN101891413B (en) * | 2010-06-18 | 2012-10-03 | 中国水利水电第三工程局有限公司 | Flocculating agent for cement high pressure jet grouting and preparation method and application thereof |
| CN103408242B (en) * | 2013-08-28 | 2015-05-06 | 北京金隅水泥节能科技有限公司 | Super slump type polycarboxylate water reducing agent for bored pile concrete and preparation method thereof |
| CN103525108B (en) * | 2013-10-24 | 2016-05-11 | 北京同华道路养护有限责任公司 | A kind of high-modulus cold-mix asphalt and preparation method thereof, with and compound |
| CN104193216A (en) * | 2014-06-24 | 2014-12-10 | 济南大学 | Glucose high-polymer marine concrete anti-dispersion agent and preparation method thereof |
| CN107098645B (en) * | 2017-05-08 | 2019-06-18 | 天津市滨涛混凝土有限公司 | Non-dispersible underwater concrete and preparation method thereof |
| CN109748549A (en) * | 2019-01-14 | 2019-05-14 | 贵州中建建筑科研设计院有限公司 | A kind of C50 or more underwater concrete and its stake holes casting method |
| CN110563413A (en) * | 2019-10-23 | 2019-12-13 | 中建西部建设贵州有限公司 | Low-grade machine-made sand concrete for downward pumping track and preparation method thereof |
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