CN115142694A - Large-volume concrete heat-preservation curing barrel and curing method - Google Patents

Large-volume concrete heat-preservation curing barrel and curing method Download PDF

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Publication number
CN115142694A
CN115142694A CN202210936601.8A CN202210936601A CN115142694A CN 115142694 A CN115142694 A CN 115142694A CN 202210936601 A CN202210936601 A CN 202210936601A CN 115142694 A CN115142694 A CN 115142694A
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China
Prior art keywords
barrel
maintenance
concrete
curing
preservation
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CN202210936601.8A
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Chinese (zh)
Inventor
王成启
陆虎
杨辉
田欣
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CCCC Third Harbor Engineering Co Ltd
CCCC Shanghai Third Harbor Engineering Science and Technology Research Institute Co Ltd
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CCCC Third Harbor Engineering Co Ltd
CCCC Shanghai Third Harbor Engineering Science and Technology Research Institute Co Ltd
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Priority to CN202210936601.8A priority Critical patent/CN115142694A/en
Publication of CN115142694A publication Critical patent/CN115142694A/en
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
    • E04G21/246—Safety or protective measures preventing damage to building parts or finishing work during construction specially adapted for curing concrete in situ, e.g. by covering it with protective sheets
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
    • E04G21/08—Internal vibrators, e.g. needle vibrators
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/02—Forming boards or similar elements
    • E04G9/06—Forming boards or similar elements the form surface being of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G9/00—Forming or shuttering elements for general use
    • E04G9/10—Forming or shuttering elements for general use with additional peculiarities such as surface shaping, insulating or heating, permeability to water or air
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The application discloses bulky concrete heat preservation maintenance bucket and maintenance method, this maintenance bucket includes: the maintenance barrel comprises a maintenance barrel body and an inorganic fiber cotton heat insulation layer, wherein the maintenance barrel body is arranged in an open mode from top to bottom, the inorganic fiber cotton heat insulation layer is arranged on the outer side of the maintenance barrel, and the inorganic fiber heat insulation layer is formed by fully mixing mineral fibers and bonding materials. The maintenance method comprises the following steps: coating a binder on the bottom of the curing barrel; installing the curing barrel on the top of the large-volume concrete member; and coating silica gel at the gap between the inner side wall of the maintenance barrel and the large-volume concrete member. This application can effectively regulate and control the interior surface difference in temperature of bulky concrete, guarantees that bulky concrete satisfies the standard requirement at temperature rise and cooling in-process concrete interior surface difference in temperature, controls bulky concrete temperature stress to guarantee that bulky concrete can not produce the temperature crack at the work progress, guarantee engineering quality.

Description

Large-volume concrete heat-preservation curing barrel and curing method
Technical Field
The application belongs to the technical field of concrete construction quality control, and particularly relates to a large-volume concrete heat-preservation curing barrel and a curing method.
Background
Cementitious materials such as cement in the mass concrete can emit a large amount of heat in the hydration process, and the concrete is a poor conductor of heat, so that the heat generated in the mass concrete member cannot be timely dissipated, and the internal temperature of the mass concrete member often exceeds 70 ℃. Because the heat in the concrete structure can not be transferred to the surface in time, the surface temperature of the concrete member is low, and the internal temperature is high, so that the temperature stress caused by large internal surface temperature difference can be generated, and further the crack of the mass concrete member is caused.
In order to reduce the temperature difference on the inner surface of the large-volume concrete member, technical measures such as cooling water pipe temperature reduction and external heat preservation and maintenance are mostly adopted in the concrete at present, wherein the external heat preservation and maintenance is an important technical measure for controlling the temperature difference on the inner surface of the large-volume concrete member. The common heat preservation and maintenance measures are to cover heat preservation materials such as heat preservation cotton quilt and geotextile outside the mass concrete member. Since the specific heat capacity of water is about 4.2X 10 3 J/(kg-DEG C) is obviously higher than other liquid materials and the like, has good heat preservation effect, is an effective method for effectively controlling the temperature difference inside the concrete by water storage and maintenance on the top of a large-volume concrete member, and can overcome the defect of poor heat preservation and maintenance effect of conventional materials such as heat preservation cotton quilt, geotextile and the like. In order to store water and maintain the top of the concrete member, a surface water storage and maintenance device suitable for heat preservation and maintenance needs to be developed. Therefore, related research is developed to this patent, has developed the heat preservation maintenance bucket of the retaining maintenance on bulky concrete surface to control bulky concrete member internal surface difference in temperature, control bulky concrete member temperature crack.
Disclosure of Invention
Aiming at the defects or the defects of the prior art, the technical problem to be solved by the application is to provide the large-volume concrete heat-preservation curing barrel and the curing method, the inner surface temperature difference of the large-volume concrete is effectively regulated and controlled, the inner surface temperature difference of the large-volume concrete in the temperature rise and cooling process is ensured to meet the standard requirement, and the temperature stress of the large-volume concrete is controlled, so that the large-volume concrete is ensured not to generate temperature cracks in the construction process, and the engineering quality is ensured.
In order to solve the technical problem, the application is realized by the following technical scheme:
the application provides a bulky concrete heat preservation maintenance bucket includes: the maintenance barrel comprises a maintenance barrel body and an inorganic fiber cotton heat insulation layer, wherein the maintenance barrel body is arranged in an open mode from top to bottom, the inorganic fiber cotton heat insulation layer is arranged on the outer side of the maintenance barrel, and the inorganic fiber heat insulation layer is formed by fully mixing mineral fibers and bonding materials.
Wherein, in this application, the overall dimension of maintenance bucket is the same with bulky concrete member top size, and the height is 500-1000mm, can adopt the welding concatenation.
Optionally, in the bulk concrete heat-preservation curing barrel, the curing barrel body is made of a steel plate.
Optionally, in the bulk concrete thermal insulation curing barrel, a thickness of the steel plate is 20 to 30mm.
Optionally, in the bulk concrete thermal-insulation curing barrel, the thickness of the inorganic fiber thermal-insulation layer is 200 to 300mm. Optionally, the thermal conductivity coefficient of the inorganic fiber heat-insulating layer is not more than 0.036 w/m.k, the inorganic fiber cotton heat-insulating layer is sprayed out at a high speed by a special device through mineral fibers and bonding materials, and the mineral fibers and the bonding materials are fully mixed at the end opening of the spray head, so that the airtight seamless inorganic fiber cotton heat-insulating layer is formed outside the barrel body.
Optionally, in the bulk concrete thermal insulation curing barrel, the mineral fibers are made of glass wool or rock wool, and the diameter of the mineral fibers is 3 to 5 μm.
Optionally, in the bulk concrete heat-preservation curing barrel, the mineral fiber content in the inorganic fiber heat-preservation layer is 10 to 20% by volume.
Optionally, in the bulk concrete heat preservation and maintenance barrel, the binder is composed of gypsum, cement and water, wherein the water accounts for 20% -30% of the total mass of the gypsum and the cement, and the gypsum accounts for 70% -80% of the total mass of the gypsum and the cement. And/or the gypsum is hemihydrate gypsum; and/or the cement is Portland cement or ordinary Portland cement with the strength grade not lower than 42.5.
The application also provides a maintenance method of the large-volume concrete heat-preservation maintenance barrel, which comprises the following steps:
after the poured mass concrete member is finally set, coating a binder on the bottom of the curing barrel; wherein, the adhesive is preferably an epoxy adhesive;
installing the maintenance barrel on the top of the mass concrete member to effectively bond the maintenance barrel and the mass concrete top surface;
and coating silica gel at the gap between the inner side wall of the maintenance barrel and the large-volume concrete member.
Optionally, in the maintenance method, the silica gel coated on the inner side wall of the maintenance barrel and the top surface of the large-volume concrete member form an equilateral triangle silica gel sealing layer with side length of 30-50mm, so that water is prevented from leaking from a joint surface of the maintenance barrel and the large-volume concrete member.
Optionally, in the maintenance method, after the large-volume concrete member is finally set, water is injected into the maintenance barrel, the water injection depth is controlled to be 400-600mm, and the water temperature is not lower than 5 ℃; wherein the water temperature varies according to the ambient temperature, and is the same as the ambient temperature.
Compared with the prior art, the method has the following technical effects:
the cotton quilt and the geotechnical cloth heat preservation effect of the cotton quilt and the geotechnical cloth are poor in heat preservation effect in the prior art, consumption of the cotton quilt and the geotechnical cloth can be saved, the temperature control effect is good, and remarkable economic and social benefits are achieved.
This application is through the mode that the retaining was kept warm to the retaining, but the internal surface difference in temperature of effective control bulky concrete member, and the internal surface difference in temperature is steerable within 20 ℃, is showing to be less than current standard 25 ℃ control requirement.
This application has guaranteed concrete exterior temperature and inside temperature synchronous increase through the heat preservation combined action of the outside heat preservation of staving and water, effectively reduces the inside and outside difference in temperature of bulky concrete member and cools down too fast, overcomes prior art bulky concrete crack technical problem appearing.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Materials and tools used in the examples
(1) Size of mass concrete member: the length is 5000mm, the width is 4000mm, and the height is 1500mm.
(2) Template: a steel template is adopted, the thickness of the steel plate is 25mm, an ultrafine inorganic fiber cotton heat insulation layer is sprayed on the outer side of the steel plate, and the thickness of the heat insulation layer is 250mm.
(3) And (4) maintaining the barrel in a heat preservation way: the length is 5000mm, the width is 4000mm, and the height is 650mm.
(4) Thermal insulation material: the superfine rock wool fiber heat-insulating layer consists of rock wool fiber with the diameter of 4 microns, semi-hydrated gypsum, ordinary Portland cement with the strength grade of 42.5 and water; the thickness of the heat preservation cotton quilt is 200mm; the geotechnical cloth adopts two layers of geotechnical cloth, and the thickness is 15mm.
(5) The concrete mixing proportion is as follows: c40 concrete was used, and the concrete formulation is shown in Table 1. Adopting common Portland cement with the strength grade of 42.5; 5-31.5mm continuous graded crushed stone; medium sand with fineness modulus of 2.5; class II fly ash; s95, slag powder; a high-performance water reducing agent with the water reducing rate of 25 percent.
TABLE 1 concrete mix proportion (kg/m) 3 )
Cement Coarse aggregate Fine aggregate Fly ash Slag powder Water reducing agent Water (W)
285 1110 680 109 45 4.30 165
(6) A concrete mixer: 2m 3 A concrete mixer.
(7) Concrete equipment of vibrating: FRZ-50 pneumatic vibrating rod.
(8) Temperature monitoring equipment: a wireless transmission digital display large-volume concrete temperature measurement computer monitoring system is adopted.
The curing method according to the present example is as follows:
(1) Pouring of concrete
The concrete mixing proportion in the table 1 is adopted, the concrete is stirred, the thickness of each layer is 400mm, a vibrating rod is adopted to pour large-volume concrete, and the large-volume concrete member is 5000mm long, 4000mm wide and 2000mm high.
(2) Manufacturing and installing heat-preservation maintenance barrel
The heat-preservation maintenance barrel is manufactured by adopting a welding process, the length of the heat-preservation maintenance barrel is 5000mm, the width of the heat-preservation maintenance barrel is 4000mm, the height of the heat-preservation maintenance barrel is 650mm, and an ultra-fine rock wool fiber heat-preservation layer is sprayed on the outer side of the barrel body, and the thickness of the heat-preservation layer is 250mm.
After the concrete is finally set, adopting water and cement in a mass ratio of 1:2, leveling the top surface of the large-volume concrete member to ensure that the heat-preservation maintenance barrel is in good contact with the top surface of the member, wherein the cement used by the cement mortar can adopt cement with the strength grade not lower than 42.5. And coating a layer of epoxy adhesive on the bottom of the manufactured maintenance and heat-preservation barrel, immediately installing the heat-preservation and maintenance barrel on the top surface of the large-volume concrete member, and coating silica gel on the gap between the inner side of the heat-preservation barrel and the member to form an equilateral triangle silica gel sealing layer with the side length of 40 mm.
(3) Concrete water storage heat preservation maintenance
After the heat-preserving barrel is installed, water is injected into the heat-preserving curing barrel immediately, the water injection height is 500mm, and the water temperature is the same as the atmospheric temperature.
(4) Concrete temperature monitoring
Temperature sensor measuring points are respectively arranged at the center point of the member and 50mm in the surface layer of the concrete member, and the temperature difference in the inner surface of the concrete member at different time is monitored.
(5) Concrete temperature detection result
Under the conditions that the air temperature is 5 ℃, 15 ℃, 25 ℃ and 35 ℃, the covering of the top surface of the concrete member with the heat-preservation cotton quilt, the covering of the top surface of the concrete member with the geotextile and the curing of the heat-preservation curing barrel are respectively monitored, the inner surface temperature difference of concrete under three heat-preservation curing conditions at different time after final setting is tested, and the test results are shown in table 2.
TABLE 2 maximum inner surface temperature difference monitoring results (. Degree. C.) of concrete
Figure BDA0003783669650000051
Figure BDA0003783669650000061
From the table 2, the maximum temperature difference of the covering heat preservation cotton quilt, the covering geotextile and the heat preservation maintenance barrel of the invention is 27.9-30.1 ℃, 29.8-32.3 ℃ and 16.5-18.5 ℃ respectively, so that the heat preservation maintenance barrel can effectively control the inner surface temperature difference of the large-volume concrete member and control the temperature crack of the large-volume member.
The above embodiments are merely to illustrate the technical solutions of the present application and are not limitative, and the present application is described in detail with reference to preferred embodiments. It should be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the claims which follow.

Claims (10)

1. The utility model provides a bulky concrete heat preservation maintenance bucket which characterized in that includes: the maintenance bucket body that opens the setting from top to bottom and setting are in the inorganic fiber cotton heat preservation in the maintenance bucket outside, the inorganic fiber heat preservation is formed by mineral fiber and binder intensive mixing.
2. The bulk concrete heat-preservation curing barrel of claim 1, wherein the curing barrel body is made of a steel plate.
3. The bulk concrete thermal maintenance bucket according to claim 2, wherein the thickness of the steel plate is 20-30mm.
4. The bulk concrete thermal insulation curing barrel according to claim 1, wherein the thickness of the inorganic fiber thermal insulation layer is 200-300mm.
5. The bulk concrete thermal insulation curing barrel according to claim 1, wherein the mineral fiber is made of glass wool or rock wool, and the diameter of the mineral fiber is 3-5 μm.
6. The bulk concrete thermal curing drum according to claim 1, wherein the mineral fiber content of the inorganic fiber thermal insulation layer is 10-20% by volume.
7. The bulk concrete heat-preservation and maintenance barrel according to claim 1, wherein the bonding material is composed of gypsum, cement and water, wherein the water accounts for 20-30% of the total mass of the gypsum and the cement, and the gypsum accounts for 70-80% of the total mass of the gypsum and the cement; and/or the gypsum is hemihydrate gypsum; and/or the cement is Portland cement or ordinary Portland cement with the strength grade not lower than 42.5.
8. A method of maintaining a bulk concrete thermal maintenance bucket according to any one of claims 1 to 8, comprising:
coating a binder on the bottom of the curing barrel;
installing the curing barrel on the top of the large-volume concrete member;
and coating silica gel at the gap between the inner side wall of the maintenance barrel and the large-volume concrete member.
9. The curing method of claim 8, wherein the painted silica gel forms an equilateral triangle silica gel sealing layer with a side length of 30-50mm on the inner side wall of the curing barrel and the top surface of the large-volume concrete member.
10. The curing method of claim 8, wherein water is injected into the curing barrel after the mass concrete member is finally set, the water injection depth is controlled to be 400-600mm, and the water temperature is not lower than 5 ℃.
CN202210936601.8A 2022-08-05 2022-08-05 Large-volume concrete heat-preservation curing barrel and curing method Pending CN115142694A (en)

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Publication number Priority date Publication date Assignee Title
JP2014084613A (en) * 2012-10-23 2014-05-12 Okumura Corp Method for curing tunnel lining concrete
CN207987751U (en) * 2018-02-09 2018-10-19 张掖交通建设投资有限责任公司 Concrete pier curing means under a kind of dry and big temperature change environment
CN109386092A (en) * 2018-12-05 2019-02-26 华侨大学 A kind of constructing device and method of room temperature maintenance very-high performance steel core concrete column
CN209665758U (en) * 2018-10-31 2019-11-22 上海城建市政工程（集团）有限公司 A kind of curing means for concrete prefabricated element
CN113463934A (en) * 2021-07-20 2021-10-01 江西省交通工程集团建设有限公司 Temperature-control anti-cracking curing method for mass concrete
CN113789968A (en) * 2021-09-15 2021-12-14 中国水利水电第七工程局有限公司 Large-area concrete on-site water storage curing device and curing method

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Publication number Priority date Publication date Assignee Title
JP2014084613A (en) * 2012-10-23 2014-05-12 Okumura Corp Method for curing tunnel lining concrete
CN207987751U (en) * 2018-02-09 2018-10-19 张掖交通建设投资有限责任公司 Concrete pier curing means under a kind of dry and big temperature change environment
CN209665758U (en) * 2018-10-31 2019-11-22 上海城建市政工程（集团）有限公司 A kind of curing means for concrete prefabricated element
CN109386092A (en) * 2018-12-05 2019-02-26 华侨大学 A kind of constructing device and method of room temperature maintenance very-high performance steel core concrete column
CN113463934A (en) * 2021-07-20 2021-10-01 江西省交通工程集团建设有限公司 Temperature-control anti-cracking curing method for mass concrete
CN113789968A (en) * 2021-09-15 2021-12-14 中国水利水电第七工程局有限公司 Large-area concrete on-site water storage curing device and curing method

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