CN116283132A - Micro-vibration self-compaction ultrahigh-flow-state concrete product for bridge structure - Google Patents
Micro-vibration self-compaction ultrahigh-flow-state concrete product for bridge structure Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 85
- 238000005056 compaction Methods 0.000 title claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 54
- 230000000996 additive effect Effects 0.000 claims abstract description 54
- 239000000463 material Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000004568 cement Substances 0.000 claims abstract description 24
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- 239000002994 raw material Substances 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 7
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B13/00—Feeding the unshaped material to moulds or apparatus for producing shaped articles; Discharging shaped articles from such moulds or apparatus
- B28B13/02—Feeding the unshaped material to moulds or apparatus for producing shaped articles
- B28B13/0215—Feeding the moulding material in measured quantities from a container or silo
- B28B13/023—Feeding the moulding material in measured quantities from a container or silo by using a feed box transferring the moulding material from a hopper to the moulding cavities
- B28B13/0235—Feeding the moulding material in measured quantities from a container or silo by using a feed box transferring the moulding material from a hopper to the moulding cavities the feed box being provided with agitating means, e.g. stirring vanes to avoid premature setting of the moulding material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
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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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
- 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
-
- 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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- Engineering & Computer Science (AREA)
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Abstract
The invention discloses a bridge structure micro-vibration self-compaction ultrahigh flow state concrete product in the technical field of concrete products, which comprises Portland cement, fine aggregate, coarse aggregate, an additive, an admixture and water; wherein the admixture comprises fly ash and silica powder; the additive adopts a compound additive with pumpability, retarding, early strength, reinforcement and high-efficiency water reduction; cementing materialThe material consumption is 460-530 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the mixing amount of the additive is 0.8-1.5% of the dosage of the cementing material, the proportion of water to the cementing material is 0.30-0.38, the sand ratio is 35-40%, the fine aggregate adopts sand in a zone II, and the fineness modulus is 2.6-2.9; the coarse aggregate adopts secondary graded broken stone with the grain diameter of 5-15 mm and 15-25 mm, and the coarse aggregate is prepared according to the ratio of 1:1 with the grain diameter of 5-15 mm and 15-25 mm. The product reasonably selects main parameters such as water-cement ratio, unit water consumption, sand ratio and the like, so that the prepared concrete product has good reproducibility, and the mechanical property, stability and durability are greatly improved and improved compared with the conventional concrete.
Description
Technical Field
The invention belongs to the technical field of concrete products, and particularly relates to a micro-vibration self-compaction ultrahigh-flow-state concrete product for a bridge structure.
Background
By the 21 st century, with the development of ultra-high performance concrete technology and large span bridge construction, the application of C50-C80-level high-strength micro-vibration self-compaction ultra-high-flow concrete will be wider and wider. The self-compaction ultrahigh-flow-state concrete is increasingly widely applied to large-span bridges, and the prepared self-compaction ultrahigh-flow-state concrete is ensured to meet the technical performance and engineering use requirements, and the matching proportion of all the constituent materials is very important. The self-compaction ultra-high flow state concrete has more components, complex factors influencing the technical performance, and various influencing factors must be comprehensively considered when the mix proportion optimization design is carried out, the proper raw material types and the mixing amount are selected through experiments, the mix proportion is further optimized in engineering application, the quality is strictly controlled in construction, and good implementation effect can be obtained. Therefore, a bridge structure micro-vibration self-compaction ultrahigh-flow-state concrete product is necessary to be provided.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a bridge structure micro-vibration self-compaction ultrahigh-flow-state concrete product with a relatively-optimal mixing ratio.
In order to achieve the above object, the technical scheme of the present invention is as follows: the bridge structure micro-vibration self-compaction ultrahigh-flow state concrete product comprises cement, fine aggregate, coarse aggregate, an additive, an admixture and water; cement and an admixture form a cementing material, wherein the admixture comprises fly ash and silica fume; the additive is a composite additive; the dosage of the cementing material is 460-530 kg/m 3 。
Further, the water-cement ratio, i.e., the ratio of water to cement, is 0.30 to 0.38.
Further, the sand ratio is 35 to 40%.
Further, the mixing amount of the additive is 0.8-1.5% of the dosage of the cementing material.
Further, the fine aggregate adopts sand in a zone II, and the fineness modulus is 2.6-2.9.
Further, the coarse aggregate adopts secondary graded broken stone with the grain diameter of 5-15 mm and 15-25 mm.
Further, coarse aggregate 5-15 mm and 15-25 mm size fraction are prepared according to a ratio of 1:1.
Further, the concrete product is prepared by the following steps:
step one, preparing materials: preparing Portland cement, fine aggregate, coarse aggregate, additive, admixture, water and a mold;
step two, additive treatment: dissolving the powder additive for 24 hours to form a uniform solution, then using the uniform solution, periodically measuring the concentration of the additive, and uniformly shaking the powder additive before weighing and using;
step three, material metering: the concrete product is accurately weighed according to the mixing ratio of unit dosage kg/m3, wherein the mixing ratio is cement, sand, broken stone, water, fly ash and additive=450:65:665:1085:180:5.15.
Step four, batching: sequentially pouring the weighed materials into a stirring pot of forced stirring equipment according to the sequence of coarse aggregate, fine aggregate, cement and admixture, and uniformly stirring;
step five, adding an additive: the additive is fully and evenly shaken, weighed and added into water to be stirred evenly, then a stirrer is started, and the additive is added into the mixture within 30 seconds;
step six, mixing the mixture: the concrete mixture is intensively mixed by adopting forced stirring equipment, the mixture is continuously stirred for 30s after the additive is added into the mixture, and the slump, strength and other indexes of the mixture are inspected according to the frequency;
step seven, molding a test piece: and forming test pieces according to concrete test rules, and separating 3d, 7d and 28d ages, wherein each group of 3 test pieces is subjected to die curing for 24h and die stripping.
Step eight, pouring in situ: and layering or sectional pouring is performed by adopting a pumping process, tamping is needed fully, and whether honeycomb, pitting surface and cavity conditions occur or not is observed.
And step nine, product maintenance: and (3) curing the indoor test products according to the 3d, 7d and 28d age standard, and sprinkling water for moisturizing the field products for more than 14 days.
Further, the concrete mixture needs to be transported far without time-out, and slump and strength indexes of the mixture are inspected at specified frequencies.
The basic scheme has the following principle and beneficial effects: the concrete formed by different additive varieties and mixing amounts has different workability, slump loss and strength, and the additive varieties and mixing amounts need to be reasonably selected through experiments. The mixing amount of the obtained additive is not excessively large (not more than 2%), and is preferably controlled to be 0.8-1.5%, so that the mixing amount is excessively large, the fresh concrete is seriously bleeding, cement paste is greatly lost, aggregate is isolated, the compactness of the concrete is insufficient, the early shrinkage is increased and the like, and the strength of the concrete is affected; meanwhile, the influence of the cementing material on the strength of the concrete is not that the larger the dosage is, the higher the strength is. Excessive increases in the binder will weaken the skeletal action of the aggregate, rather reducing the concrete strength. The dosage of the cementing material is controlled to be 450-550 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the The effect of different sand rates on workability and strength of concrete is also obvious. In order to ensure that the trial-mix concrete has good workability and mechanical property, the sand rate should not exceed 45 percent, and the optimal sand rate range should be 35-40 percent.
Therefore, the concrete product has good reproducibility, and the mechanical property, stability and durability are greatly improved and improved compared with the conventional concrete; the new self-compacting ultrahigh-flow-state concrete has very high fluidity, good cohesiveness, water retention, self-tightness, dry shrinkage, impermeability, stability and durability, no bleeding and segregation, good consistency of slump time loss and indoor test, small fluidity and expansion time loss, can achieve the effect of self-leveling without vibrating, can be filled with templates and wrapped reinforcing steel bars, can always meet the requirement of a pumping process, has no pipe blocking or pipe bursting phenomenon, and has all index measurement values of spot sampling inspection qualified, and the formed concrete structure has good internal quality and appearance quality. Too early water loss and microcrack generation can be avoided or reduced, thereby ensuring the integrity of the engineering structure.
Drawings
Fig. 1 is a schematic diagram of a method for manufacturing a micro-vibration self-compacting ultrahigh-flow-state concrete product with a bridge structure in an embodiment of the invention.
Detailed Description
The following is a further detailed description of the embodiments:
an example is substantially as shown in figure 1: a micro-vibration self-compaction ultrahigh-flow-state concrete product of a bridge structure comprises Portland cement, sand stone, fine aggregate, coarse aggregate, an additive, an admixture and water, wherein the cement and the admixture form a cementing material; wherein the admixture comprises fly ash and silica powder; the additive adopts a compound additive with pumpability, retarding, early strength, reinforcement and high-efficiency water reduction; the dosage of the cementing material is 460-530 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Wherein the mixing amount of the additive is 0.8-1.5% of the dosage of the cementing material, the ratio of silicate cement to water is 0.30-0.38, the sand stone rate is 35-40%, the fine aggregate adopts sand in a zone II, the fineness modulus is 2.6-2.9, and the coarse aggregate adopts secondary graded broken stone with the grain diameter of 5-15 mm and 15-25 mm and is prepared according to the ratio of 1:1.
In this example, portland cement was a 42.5 grade Portland cement having a Hua Hong brand strength grade from Guangxi-Hua Hongyi cement Co., ltd; the coal ash adopts class I fly ash of Guangxi guest power plant.
As shown in fig. 1, the method for manufacturing the concrete product comprises the following steps:
step one, preparing materials: preparing Portland cement, fine aggregate, coarse aggregate, additive, admixture, water and a mold;
step two, additive treatment: dissolving the powder additive for 24 hours to form a uniform solution, then using the uniform solution, periodically measuring the concentration of the additive, and uniformly shaking the powder additive before weighing and using;
step three, material metering: the concrete product is prepared according to the unit dosage of kg/m 3 The mixing proportion is accurately weighedThe mixing ratio of the cement, the sand, the crushed stone, the water, the fly ash and the additive=450:65:665:1085:180:5.15.
Step four, batching: sequentially pouring the weighed materials into a stirring pot of forced stirring equipment according to the sequence of coarse aggregate, fine aggregate, cement and admixture, and uniformly stirring;
step five, adding an additive: the additive is fully and evenly shaken, weighed and added into water to be stirred evenly, then a stirrer is started, and the additive is added into the mixture within 30 seconds;
step six, mixing the mixture: the concrete mixture is intensively mixed by adopting forced stirring equipment, the mixture is continuously stirred for 30s after the additive is added into the mixture, and the slump, strength and other indexes of the mixture are inspected according to the frequency;
step seven, molding a test piece: forming test pieces according to a concrete test rule, and separating 3d, 7d and 28d ages, wherein each group of 3 test pieces is subjected to die maintenance for 24h and die removal;
step eight, pouring in situ: and layering or sectional pouring is performed by adopting a pumping process, tamping is needed fully, and whether honeycomb, pitting surface and cavity conditions occur or not is observed.
And step nine, product maintenance: and (3) curing the indoor test products according to the 3d, 7d and 28d age standard, and sprinkling water for moisturizing the field products for more than 14 days.
The indoor test procedure is as follows:
1. mix ratio design and test results
According to the basic principle and engineering requirements of self-compacting ultra-high flow state concrete mix proportion design, main parameters such as water cement ratio, unit water consumption, sand ratio and the like are reasonably selected under standard conditions, the unit consumption of each component material is calculated, and the optimal mix proportion and performance results are obtained through a comparison test, and are shown in tables 1 and 2. Wherein the strength of the C-2 mixing ratio is higher, but the bleeding of the mixture is more obvious; the additive and the mixture used in the A-2 mixing ratio have stable performance and good repeatability of test results.
Table 1 concrete mix and test results
Note that: (1) the water-cement ratio of A-2 to B-2 is 0.35, the water-cement ratio of C-2 is 0.34, the sand ratio is 38%, and the mixing amount of the additive is 1.0% of the dosage of the cementing material. (2) The A-2 adopts Zhanjiang FDN high-efficiency water reducer; b-2 adopts Shanxi ZG-N1 type high-efficiency water reducer; c-2 adopts Jiangxi NF2000 IIA early strength high efficiency water reducing agent. (3) The expansion in the table is the diameter of the cone concrete at the time of slump measurement.
Table 2A-2 results of the mix reproducibility test
Note that: adopts Zhanjiang FDN high-efficiency water reducer. All measured values meet the design strength and construction workability requirements.
The research results show that:
(1) The concrete formed by different additive varieties and mixing amounts has different workability, slump loss and strength, and the additive varieties and mixing amounts need to be reasonably selected through experiments. The mixing amount of the admixture is not excessively large (not more than 2%), preferably controlled to be 0.8-1.5%, and the excessive mixing amount can cause serious bleeding of fresh concrete, massive loss of cement paste, segregation of aggregate, insufficient compactness of the concrete, increase of early shrinkage and the like, thereby influencing the strength of the concrete.
(2) When the concrete is tested according to the design matching ratio, the slump and the expansion degree of the measured value reflecting the workability index of the fresh concrete are in accordance with the design and construction requirements, so that the fresh concrete has good self-leveling and self-compaction capability.
(3) The effect of the cement on the strength of the concrete is not that the greater the amount, the higher the strength. Excessive increases in the binder will weaken the skeletal action of the aggregate, rather reducing the concrete strength. The dosage of the cementing material should not exceed 450-550 kg/m3. Preferably, the concentration is controlled to about 500kg/m 3.
(4) The effect of different sand rates on workability and strength of concrete is also obvious. In order to ensure that the trial-mix concrete has good workability and mechanical property, the sand rate should not exceed 45 percent, and the optimal sand rate range should be 35-40 percent.
2. Performance study
1. Workability and pumpability
The main evaluation indexes of the workability and pumpability of the self-compacting ultra-high fluid concrete are slump and expansion degree and the loss thereof with time. Slump reflects the fluidity of fresh concrete in the vertical direction, and expansion reflects the fluidity of fresh concrete in the horizontal direction, and has important influence on the construction of concrete. The workability index measurements for the design blend ratios are shown in tables 1 and 2. The results of the slump and expansion loss over time are shown in Table 4. Analysis results show that the fresh concrete can still reach the slump (more than or equal to 160 mm) and the expansion degree (more than or equal to 550 mm) required by pumping after 2 hours, the problem of time loss of the slump and the expansion degree is solved, and the construction process requirement is met. Wherein the range of the measured value of A-2 is minimized, i.e., the loss with time of slump and expansion is minimized.
TABLE 4 slump and expansion loss over time of fresh concrete comparative test results
2. Mechanical properties
The research shows that the mechanical properties of the self-compacting ultra-high performance concrete are determined not only by the strength of the cementing material, the strength of the interface between the cementing material and the aggregate, the strength of the aggregate and the construction quality of the working procedure, but also by the curing conditions. The effect of different curing conditions on the development of the concrete strength is obvious, and the test results are shown in Table 5. The measured strength of the concrete was different from the measured strength of the concrete under different curing conditions, but the rule of strength increase was substantially uniform, as compared with the measured values in table 1. Therefore, the concrete should be immediately subjected to moisture preservation and maintenance after being molded, so that premature excessive moisture loss and microscopic defects are avoided, and the normal increase of the strength of the concrete is ensured.
TABLE 5 curing conditions and concrete Strength test results
Note that: the average air temperature during the test was below 20 ℃.
3. Volume stability
The results of the different age drying tests of the recommended blend ratio are shown in Table 6. When the volume ratio of the cementing material slurry of the concrete test mix ratio in the table is 35% and the water-cement ratio is not more than 0.35, the measured dry shrinkage is smaller, which shows that the volume shrinkage is smaller and the crack resistance is stronger.
Table 6 concrete drying shrinkage test results
4. Durability of
The high-efficiency water reducing effect of the admixture can effectively improve the durability of the concrete. A test for the permeation resistance rating reflecting durability was conducted for the recommended A-2 blend ratio, and the test results are shown in Table 7. The result shows that the concrete has the impermeability grade of S12 and meets the durability requirement of the structure.
TABLE 7 test results of concrete permeation resistance rating
3. Examples of the embodiments
The temporary Jiang Gongshui river super bridge is one of ten key projects of world bank loan projects, namely Guangxi Shuinan expressway projects, and is a (75+125+75) m prestressed concrete continuous rigid frame bridge, adopts a double-amplitude separated structure, adopts a single-box single-chamber box girder, and is provided with a longitudinal, transverse and vertical prestress system. The experimental study and engineering application led to: recommended dosage (mixing amount) range of each component material in the optimized C50 micro-vibration self-compaction ultra-high flow state concrete mixing ratio: the cementing material is 460-530 kg/m3, the water-cement ratio is 0.30-0.40, the optimal sand ratio is 33-40%, and the mixing amount of the additive is 0.8-1.5% of the dosage of the cementing material. Practice shows that the recommended concrete mixing ratio of the super bridge of the river of Jiang Gongshui is cement, broken stone, water, fly ash and additive=450:65:665:1085:180:5.15 kg/m3 according to unit dosage, has high-quality technical performance and quality, and can prevent or reduce premature excessive moisture loss and microcrack generation by performing moisture maintenance according to the regulations, thereby ensuring the integrity of engineering structures.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing is merely an embodiment of the present invention, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application day or before the priority date of the present invention, and can know all the prior art in the field, and have the capability of applying the conventional experimental means before the date, so that a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present application, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present application. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (9)
1. A bridge structure micro-vibration self-compaction ultrahigh flow state concrete product is characterized in that: the raw materials comprise cement, fine aggregate, coarse aggregate, admixture and water; cement and an admixture form a cementing material, wherein the admixture comprises fly ash and silica fume; the additive adopts a compound additive with pumpability, retarding, early strength, reinforcement and high-efficiency water reduction; the dosage of the cementing material is 460-530 kg/m 3 。
2. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 1, wherein: the water-cement ratio, i.e. the ratio of water to cementing material, is 0.30-0.38.
3. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 2, wherein: the sand rate is 35-40%.
4. A bridge construction micro-vibration self-compacting ultra-high fluid state concrete product as defined in claim 3, wherein: the mixing amount of the additive is 0.8-1.5% of the dosage of the cementing material.
5. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 4, wherein: the fine aggregate adopts sand in a zone II, and the fineness modulus is 2.6-2.9.
6. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 5, wherein: the coarse aggregate adopts secondary graded broken stone with the grain diameter of 5-15 mm and 15-25 mm.
7. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 6, wherein: the coarse aggregate with the grain size of 5-15 mm and the grain size of 15-25 mm is prepared according to the proportion of 1:1.
8. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 7, wherein: the manufacturing method of the concrete product comprises the following steps:
step one, preparing materials: preparing Portland cement, fine aggregate, coarse aggregate, additive, admixture, water and a mold;
step two, additive treatment: dissolving the powder additive for 24 hours to form a uniform solution, then using the uniform solution, periodically measuring the concentration of the additive, and uniformly shaking the powder additive before weighing and using;
step three, material metering: the concrete product is accurately weighed according to the mixing ratio of unit dosage kg/m3, wherein the mixing ratio is cement, sand, broken stone, water, fly ash and additive=450:65:665:1085:180:5.15;
step four, batching: sequentially pouring the weighed materials into a stirring pot of forced stirring equipment according to the sequence of coarse aggregate, fine aggregate, cement and admixture, and uniformly stirring;
step five, adding an additive: the additive is fully and evenly shaken, weighed and added into water to be stirred evenly, then a stirrer is started, and the additive is added into the mixture within 30 seconds;
step six, mixing the mixture: the concrete mixture is intensively mixed by adopting forced stirring equipment, the mixture is continuously stirred for 30s after the additive is added into the mixture, and the slump, strength and other indexes of the mixture are inspected according to the frequency;
step seven, molding a test piece: forming test pieces according to a concrete test rule, and separating 3d, 7d and 28d ages, wherein each group of 3 test pieces is subjected to die maintenance for 24h and die removal;
step eight, pouring in situ: layering or sectional pouring is carried out by adopting a pumping process, tamping is needed fully, and whether honeycomb, pitted surface and cavity conditions are generated or not is observed;
and step nine, product maintenance: and (3) curing the indoor test products according to the 3d, 7d and 28d age standard, and sprinkling water for moisturizing the field products for more than 14 days.
9. The bridge construction micro-vibration self-compacting ultra-high fluid state concrete product according to claim 8, wherein: the concrete mixture needs to be transported remotely without overtime, and slump and strength indexes of the mixture are inspected at specified frequency.
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