CN110561590A - UHPC-based prefabricated part production process - Google Patents
UHPC-based prefabricated part production process Download PDFInfo
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- CN110561590A CN110561590A CN201911002565.2A CN201911002565A CN110561590A CN 110561590 A CN110561590 A CN 110561590A CN 201911002565 A CN201911002565 A CN 201911002565A CN 110561590 A CN110561590 A CN 110561590A
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- Prior art keywords
- pouring
- prefabricated part
- uhpc
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- stirring
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Classifications
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- 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
- B28B1/52—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement
- B28B1/523—Producing shaped prefabricated articles from the material specially adapted for producing articles from mixtures containing fibres, e.g. asbestos cement containing metal fibres
-
- 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
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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
Abstract
the invention relates to a production process of a prefabricated part based on UHPC (ultra high performance polycarbonate), which comprises the following process steps: s1, pouring the active dry powder into a horizontal mixer according to the proportioning requirement, adding a proper amount of water according to the water-cement ratio requirement, and starting the mixer to mix; s2, observing whether the fluidity of the mixture meets the requirement, doping steel fibers according to the strength requirement, and continuing stirring for 3-4 minutes; s3, discharging from the discharging hopper after stirring is finished, conveying to a pouring point for pouring, and pouring the prefabricated part; s4, after pouring, keeping the sample at normal temperature, and meanwhile, keeping the sample in the same condition; s5, checking whether the strength meets the requirement, removing the mold, and performing steam curing; and S6, steam curing. The reasonable and efficient UHPC prefabricated part production construction process can meet the requirements of engineering practice, and accumulates experience for the same type of construction projects, and the construction method formed by the conclusion of the achievement is particularly suitable for the prefabricated production of small-sized parts.
Description
Technical Field
The invention relates to the technical field of prefabricated part production, in particular to a production process of a prefabricated part based on UHPC.
Background
High-strength Concrete (UHPC-ultra high Performance Concrete) refers to a fiber reinforced cement-based composite material with ultra-high impermeability and mechanical properties, the mechanical properties of the composite material are obviously superior to those of conventional common Concrete, and the existing process for producing prefabricated parts based on UHPC is not mature, and a relatively high-efficiency production process flow is not formed, so improvement is urgently needed.
disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a production process of a prefabricated part based on UHPC.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a production process of a prefabricated part based on UHPC comprises the following process steps:
S1, pouring the active dry powder into a horizontal mixer according to the proportioning requirement, adding a proper amount of water according to the water-cement ratio requirement, and starting the mixer to mix;
s2, stirring for about 5-6 minutes, observing whether the fluidity of the mixture meets the requirement, doping steel fibers according to the strength requirement, and continuing stirring for 3-4 minutes;
s3, discharging from the discharging hopper after stirring is finished, conveying to a pouring point for pouring, and pouring the prefabricated part;
S4, after pouring, keeping for 24 hours at normal temperature, and meanwhile, keeping the test block sample under the same condition;
S5, after 24 hours, checking whether the strength meets the requirement, removing the mold, and performing steam curing;
And S6, after steam curing, leaving the factory and transporting to a construction site for hoisting.
further, the active dry powder comprises cement, quartz sand and fly ash, and does not contain any coarse aggregate.
further, the water/ash ratio in step S1 is 0.15.
Further, the mass of the steel fibers blended in the step S2 is 70kg per ton of the mixture.
furthermore, when the prefabricated part is poured in the step S3, the prefabricated part can be uniformly poured and distributed on the horizontal plane by sufficiently utilizing the characteristic of strong flowability of the material, and the pouring surface is fully filled with the material by utilizing the flowing characteristic of the prefabricated part, so that the uniformity and the compactness of the material can be obviously improved by adopting the method for pouring.
Furthermore, in the step S3, the attached vibrating equipment is used along with the pouring and vibrating during pouring, the vibrating equipment is used along with the pouring of the concrete, in the step S3, the upper layer pouring is completed before the lower layer is initially set in a layered pouring manner in an environment with low temperature.
Further, after the pouring in the step S4 is completed, the member is covered with a film to reduce the loss of moisture, and then is left standing.
Further, after the form removal in the step S5, steam curing is performed on the component, wherein the curing condition temperature is 90 ℃, and the curing time is 48 hours.
The invention has the following advantages: the UHPC material after pouring and forming of the invention has the following main mechanical indexes: breaking strength: not less than 20MPa, compressive strength: not less than 120MPa, tensile strength: 5-10 Mpa, elastic modulus: not less than 40 Gpa;
Besides, UHPC has other differences compared with ordinary concrete:
(1) in the stirring process of the UHPC material, fibers (steel fibers, glass fibers and the like) are doped to enhance the tensile and anti-cracking performance of the UHPC material so as to meet the structural stress requirement;
(2) the components made of UHPC can be not provided with reinforcing steel bars or reduce reinforcing steel bars through reasonable structure and structural design;
(3) the UHPC does not contain coarse aggregate, the fluidity is higher than that of common concrete (similar to mortar), each mechanical index is far better than that of common concrete, the manufactured member is lighter, various different-shaped members can be manufactured according to requirements, the surface of the member does not need to be specially treated, and the member can present bright, clean and beautiful appearance after being demoulded.
The reasonable and efficient production and construction process of the UHPC prefabricated part can meet the requirements of engineering practice, the experience is accumulated for the same type of construction projects, and the construction method formed by the conclusion of the achievement is suitable for the prefabrication production of the UHPC prefabricated part, particularly small-sized parts.
Detailed Description
The present invention will be described in further detail with reference to examples.
firstly, stirring a mixture:
The UHPC raw material is a powdery material (the main components comprise cement, quartz sand, fly ash and the like which are mixed according to a certain proportion) before stirring, and does not contain any coarse aggregate. The raw materials are conveyed to a stirring station after being dry-mixed and prepared by a manufacturer. According to raw and other materials characteristics, the used batching fill of general concrete can not be used to the agitated vessel hopper, need adopt the sealed bag that sealing performance is better to carry before the mixer after weighing the weight accurately, pour powdered material into agitated vessel again.
Because the doping amount of water has an important influence on the mechanical property of the UHPC material, in order to accurately control the water addition amount during stirring, the raw material poured into the stirring equipment needs to be accurately weighed, and generally, the weight of each stirring is about 2-3 tons as required. The UHPC material is longer in stirring time than common concrete, and generally needs to be stirred for about 10 minutes (about 2-3 minutes for common concrete). When in stirring, the powdery raw materials are poured into a stirring device, and simultaneously, a proper amount of water is poured according to the weighed weight, and the water consumption needs to be accurately measured (the water-cement ratio of the UHPC material is only 0.15, which is lower than that of common concrete).
Secondly, stirring is started after water is added, and the stirring is carried out in two stages:
the first stage is that the stirring time is about 5-6 minutes, the admixture is added in the process from the beginning of stirring after water is added, the rotating shaft of the stirrer needs to keep uniform rotating speed at the stage, the stirring speed can refer to the speed of common concrete during stirring, and the fluidity of the mixture and the change of viscosity need to be closely observed in the stirring process. Through practical observation, the mixture is obviously changed from powder to viscous state.
And in the second stage, after stirring for 5-6 minutes, doping steel fibers according to the requirements of structure and design after the mixture is basically viscous (the doping amount of the steel fibers in each ton of the mixture in the project is 70 kg). The time for mixing the steel fibers must be accurately grasped, the sufficient stirring time of the mixture must be ensured, and the mixture has certain flowing property, otherwise, the uniform distribution of the steel fibers is difficult to ensure, and the performance of the prefabricated part is influenced. And after the steel fibers are doped, continuing stirring for 3-4 minutes, and after the steel fibers are fully fused with the mixture, completing stirring.
the key points of the stirring construction are that because the UHPC material does not contain coarse aggregate and is basically in a flow plastic state in the stirring process, the stirring bin needs to be improved, the sealing property of the stirring bin is ensured, the mixture is prevented from seeping from the bottom of the bin material in the stirring process, and meanwhile, the weight of the mixture, the dosage of the additive, the water consumption, the doping amount of the steel fibers, the stirring time and the like need to be accurately measured and tracked by a person specially assigned.
Thirdly, pouring the UHPC material:
The UHPC material pouring process is approximately the same as that of common concrete, but due to certain difference of material characteristics, special attention needs to be paid during pouring.
The UHPC material has stronger fluidity (similar to mortar), can be uniformly poured and distributed on a horizontal plane by fully utilizing the characteristics of the UHPC material during pouring, and can be fully distributed on a pouring surface by utilizing the flowing characteristic of the UHPC material, and the uniformity and the compactness of the material can be obviously improved by adopting the pouring mode.
Secondly, the concrete is vibrated along with the pouring during the pouring, and the vibrating equipment is closely followed with the pouring part point. Because UHPC material viscosity is higher, form the bubble easily during pouring, in order to make the bubble discharge smoothly and reduce the influence on structure and component appearance, the frequency of vibrating is higher and the time of vibrating is longer than ordinary concrete during pouring, need vibrate until the surface does not appear obvious bubble form. During construction, the attached vibrating equipment is suggested to be used, and the vibrating efficiency is improved.
pouring needs to be carried out in a layered pouring mode, the upper layer pouring is completed before the lower layer is initially solidified, and cold seams are avoided, so that the structure and the appearance are influenced. In addition, pouring is arranged to be carried out in an environment with low air temperature as much as possible, and moisture evaporation is prevented from being fast during pouring.
Fourthly, maintaining the prefabricated part:
and after the pouring is finished, the component is immediately covered by a film, so that the water loss is reduced, and the component is stored for 24 hours at the normal temperature. According to previous researches, the compressive strength of the UHPC material can reach 30mpa at normal temperature, and the requirement of mold removal is met. In the implementation process of the project, the test block with the same condition is kept in the process of casting, the strength basically matches with the past research data through compression resistance detection, and reaches more than 30mpa, meanwhile, the raw materials used by the project and the technological processes such as stirring and casting basically meet the requirements, and the characteristics of the UHPC material are fully exerted.
after the concrete is stored for 24 hours at normal temperature, the pouring object is subjected to template removal, so that the phenomena of corner collapse and the like are basically avoided, and the strength of the member is proved to meet the requirement of template removal.
and (3) immediately performing steam curing on the component after the mold is removed, wherein the curing condition temperature is 90 ℃, and the curing time is 48 hours. This project is according to the structure characteristics, purchases small-size steam curing equipment by oneself, sets up steam maintenance canopy in the prefabricated field, and the party resides the special person and tracks and control steam maintenance condition, reserves simultaneously with the condition steam maintenance test block to inspection maintenance effect.
And fifthly, after steam curing for 48 hours, performing compression test on the retained test block under the same condition, wherein the test result shows that the compression strength of the member reaches 110-120 mpa and the requirement is basically met. Therefore, the UHPC prefabricated part is manufactured, all indexes meet the requirements, and the UHPC prefabricated part can be transported to a site for hoisting.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. A production process of a prefabricated part based on UHPC is characterized by comprising the following process steps:
S1, pouring the active dry powder into a horizontal mixer according to the proportioning requirement, adding a proper amount of water according to the water-cement ratio requirement, and starting the mixer to mix;
s2, stirring for about 5-6 minutes, observing whether the fluidity of the mixture meets the requirement, doping steel fibers according to the strength requirement, and continuing stirring for 3-4 minutes;
S3, discharging from the discharging hopper after stirring is finished, conveying to a pouring point for pouring, and pouring the prefabricated part;
S4, after pouring, keeping for 24 hours at normal temperature, and meanwhile, keeping the test block sample under the same condition;
S5, after 24 hours, checking whether the strength meets the requirement, removing the mold, and performing steam curing;
and S6, after steam curing, leaving the factory and transporting to a construction site for hoisting.
2. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: the active dry powder comprises cement, quartz sand and fly ash, and does not contain any coarse aggregate.
3. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: the water-ash ratio in the step S1 is 0.15.
4. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: the mass of the steel fibers doped in the step S2 is 70kg per ton of the mixture.
5. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: when the prefabricated part is poured in the step S3, the prefabricated part can be uniformly poured and distributed on the horizontal plane by sufficiently utilizing the characteristic of strong flowability of the material, and the material can be fully distributed on the pouring surface by utilizing the flowing characteristic of the prefabricated part.
6. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: in the step S3, the attached vibrating equipment is used along with the pouring and vibrating during pouring, the vibrating equipment is used along with the pouring of the concrete, the pouring is performed in the step S3 in an environment with low temperature, a layered pouring mode is adopted, and the upper layer pouring is completed before the lower layer is initially solidified.
7. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: and after the pouring in the step S4 is finished, covering the component by using a film to reduce the water loss, and then standing.
8. A process for producing a UHPC-based prefabricated part according to claim 1, characterized in that: and (S5) after the die is removed, performing steam curing on the component, wherein the curing condition temperature is 90 ℃, and the curing time is 48 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911002565.2A CN110561590A (en) | 2019-10-21 | 2019-10-21 | UHPC-based prefabricated part production process |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911002565.2A CN110561590A (en) | 2019-10-21 | 2019-10-21 | UHPC-based prefabricated part production process |
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| CN110561590A true CN110561590A (en) | 2019-12-13 |
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| CN201911002565.2A Pending CN110561590A (en) | 2019-10-21 | 2019-10-21 | UHPC-based prefabricated part production process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111195954A (en) * | 2020-02-21 | 2020-05-26 | 江苏尼高科技有限公司 | Production method suitable for light-color UHPC decorative product |
| CN113752375A (en) * | 2021-09-15 | 2021-12-07 | 保利长大工程有限公司 | UHPC (ultra high performance polycarbonate) segment beam prefabrication method |
| CN114789498A (en) * | 2022-03-09 | 2022-07-26 | 上海城建市政工程（集团）有限公司 | Production method of prefabricated part of UHPC (ultra high performance polycarbonate) external decorative plate with large opening rate |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105418010A (en) * | 2015-09-01 | 2016-03-23 | 深圳海龙建筑制品有限公司 | Ultra-high-performance concrete prefabricated component and preparation method thereof |
| CN108890851A (en) * | 2018-07-10 | 2018-11-27 | 佛山市路桥建设有限公司 | The construction method of UHPC prefabricated case beam |
-
2019
- 2019-10-21 CN CN201911002565.2A patent/CN110561590A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105418010A (en) * | 2015-09-01 | 2016-03-23 | 深圳海龙建筑制品有限公司 | Ultra-high-performance concrete prefabricated component and preparation method thereof |
| CN108890851A (en) * | 2018-07-10 | 2018-11-27 | 佛山市路桥建设有限公司 | The construction method of UHPC prefabricated case beam |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111195954A (en) * | 2020-02-21 | 2020-05-26 | 江苏尼高科技有限公司 | Production method suitable for light-color UHPC decorative product |
| CN113752375A (en) * | 2021-09-15 | 2021-12-07 | 保利长大工程有限公司 | UHPC (ultra high performance polycarbonate) segment beam prefabrication method |
| CN114789498A (en) * | 2022-03-09 | 2022-07-26 | 上海城建市政工程（集团）有限公司 | Production method of prefabricated part of UHPC (ultra high performance polycarbonate) external decorative plate with large opening rate |
| CN114789498B (en) * | 2022-03-09 | 2024-04-05 | 上海城建市政工程（集团）有限公司 | Production method of prefabricated part of UHPC (ultra high Performance) external decorative plate with large aperture ratio |
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Application publication date: 20191213 |
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