CN101798871B - Method for constructing concrete in frost region - Google Patents
Method for constructing concrete in frost region Download PDFInfo
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- CN101798871B CN101798871B CN201010113176XA CN201010113176A CN101798871B CN 101798871 B CN101798871 B CN 101798871B CN 201010113176X A CN201010113176X A CN 201010113176XA CN 201010113176 A CN201010113176 A CN 201010113176A CN 101798871 B CN101798871 B CN 101798871B
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Abstract
The present invention discloses a method for constructing concrete in a frost region, which is characterized in that: the concrete is heated with a special electric heating template when being cast. Copper wires are arranged in the special electric heating template and are connected with a power supply through a leakage protector; current does not exceed 350A during the casting of the concrete; the side face of the special electric heating template, facing the concrete, is provided with temperature sensors and plastic blocks; the temperature sensors are arranged at intervals of 1 to 2 square meters; the plastic blocks are arranged at intervals of 0.5 to 1.5 square meters; and a water-proof paint layer with a thickness of 5 to 8mm is brushed on the inner side of the electric heating template. The method has the advantages of convenient construction and high operability.
Description
Technical field
The present invention relates to building operations, particularly a kind of method for constructing concrete in frost region.
Background technology
Cement aquation weakens under the low temperature condition, and hardening of concrete is very slow, thereby influences concrete strength.If temperature drops to below 4 ℃, the required water of hydrated cementitious begins to expand, and the cement granules structure for the new formation of fragility may produce nonvolatil infringement.If concrete temperature drops to below freezing and since the water that freezes can not with cement chemical combination, the new compound that chemical reaction is produced in the concrete just greatly reduces, and can cause the loss of concrete strength and durability.If the temperature difference of concrete component itself is very big, also thermal cracking can appear.In the frost region construction, if these problems do not obtain adequate solution, not only can affect adversely the duration, the wasting manpower and material resources, and can cause serious quality accident.
Summary of the invention
At the deficiencies in the prior art, the purpose of this invention is to provide a kind of method for constructing concrete in frost region, solve the problem of concrete in frost region construction.
The present invention heats when the concreting by special electrothermal template.In the special electrothermal template copper wire is set, copper wire is connected with power supply by earth leakage protective device, and electric current must not surpass 350A during concreting.Special electrothermal template is provided with temperature pick up and unit of plastic in template towards concrete side.It is per 1～2m that temperature pick up is provided with frequency
2One, it is per 0.5～1.5m that unit of plastic is provided with frequency
2One.The inboard brushing waterproof paint of electrothermal template, waterproof paint thickness is 5～8mm.
Electrothermal template thickness is 3～4cm, and brass wire diameter is 5～8mm, and copper wire outside parcel terephthalic acid (TPA) ethylene glycol fat dielectric film is embedded in the groove of template.Unit of plastic is fixed on template towards concrete side, and unit of plastic is shaped as square, and length is 20～40mm, and unit of plastic thickness is provided with according to different component, and for the beam column template, thickness is 25mm; For the template die plate, thickness is 15mm, and be provided with in the time of can avoiding concreting reinforcing bar damage waterproof paint or the terephthalic acid (TPA) ethylene glycol fat dielectric film of unit of plastic cause reinforcing bar to contact with copper wire to cause short circuit when switching on.The template inboard is provided with temperature pick up, temperature pick up test frequency when concreting begins is that 1h tests once, and test frequency is that 2h tests once behind the 2h, and test frequency is that 4h tests once behind the 24h, can grasp the concrete temperature state by temperature pick up, so that the control electrical current.
For the different labels concrete, adopt different programming rates.Concrete for C40, programming rate is 15 ℃/h, and for the concrete of C35, programming rate is 14 ℃/h, concrete for C30, programming rate is 13 ℃/h, and for the concrete of C25, programming rate is 12 ℃/h, concrete for C20, programming rate is 11 ℃/h, and for the concrete of C15, programming rate is 10 ℃/h.
When concrete adopted portland cement, temperature of concrete during construction must not be above 25 ℃; When concrete adopted slag cements, temperature of concrete during construction must not be above 28 ℃; When concrete adopted trass cement, temperature of concrete during construction must not be above 30 ℃; When concrete adopted pulverized fuel ash cement, temperature of concrete during construction must not be above 32 ℃.
For the different labels concrete, adopt different maintenance processes.Concrete for C40, curing temperature is 7～8 ℃/h, concrete for C35, curing temperature is 8～9 ℃, and for the concrete of C30, curing temperature is 9～10 ℃, concrete for C25, curing temperature is 10～11 ℃, and for C20 and the concrete below the C20, curing temperature is 11～12 ℃.
Easy construction of the present invention, workable.
Description of drawings
Fig. 1 electrothermal template plan view
Fig. 2 electrothermal template sectional drawing
1, template, 2, waterproof paint, 3, unit of plastic, 4, temperature pick up, 5, copper wire, 6, terephthalic acid (TPA) ethylene glycol fat dielectric film.
The specific embodiment
Describe in detail below in conjunction with accompanying drawing.
Certain engineering beam concrete strength is C25, highly is 80cm, and width is 30cm, and span is 11m.Temperature on average is-1 ℃ during concrete construction, adopts job practices provided by the invention, and special electrothermal template comprises template 1, waterproof paint 2, unit of plastic 3, temperature pick up 4, copper wire 5, terephthalic acid (TPA) ethylene glycol fat dielectric film 6.Template 1 thickness is 4cm, and copper wire 5 diameters are 6mm.Template 1 inboard brushing waterproof paint 2, waterproof paint 2 thickness are 8mm.Copper wire 5 outsides parcel terephthalic acid (TPA) ethylene glycol fat dielectric film 6 carries out waterproof, is embedded in the groove of template 1.Unit of plastic 3 is fixed on template 1 towards concrete side, and beam side is provided with a unit of plastic 3 every 1m, and beam bottom board is provided with a unit of plastic 3 every 1.5m.Unit of plastic 3 is shaped as square, and length is 30mm, and unit of plastic 3 thickness are 25mm.Template 1 inboard is provided with temperature pick up 4, and beam side is provided with a temperature pick up 4 every 1.2m, and beam bottom board is provided with a temperature pick up 4 every 3m.Temperature pick up 4 test frequency when concreting begins is that 1h tests once, and test frequency is that 2h tests once behind the 2h, and test frequency is that 4h tests once behind the 24h.Can grasp the concrete temperature state by temperature pick up 4, so that adjust electrical current.Concrete, programming rate is 12 ℃/h, it is too fast to avoid heating up, and causes concrete cracking.
Temperature is too high, can therefore will control maximum temperature in the inner temperature that produces of concrete structure.Because the heat of hydration of dissimilar cement has difference, at dissimilar cement, adopts different concrete maximum temperatures, temperature of concrete during construction must not be above 25 ℃ in this example.
In hydration process, temperature is to the very big influence that is formed with of water mudrock structure.The concrete of not endured cold and having watered under the low temperature of freezing point being slightly higher than, the speed of clinker mineral and water mutual effect slows down, and the cement paste long period rests on colloidal state.But the lime of emitting in cement hydration process is soluble in water at low temperatures, and water is the moisture calcium silicates gel film by generating more easily, immersion cement granules inside, make chemical reaction carry out more deeply, through the result of long-time maintenance, more cement becomes new things.Therefore, at the concrete of low temperature reservation, through after the long-term maintenance, final strength is higher.For the different labels concrete, adopt different maintenance processes.The concrete curing temperature is 10～11 ℃ in this example.
Claims (9)
1. method for constructing concrete in frost region is characterized in that heating when the concreting by special electrothermal template; In the special electrothermal template copper wire is set, copper wire is connected with power supply by earth leakage protective device, and electric current must not surpass 350A during concreting; Special electrothermal template is provided with temperature pick up and unit of plastic in template towards concrete side; It is per 1～2m that temperature pick up is provided with frequency
2One, it is per 0.5～1.5m that unit of plastic is provided with frequency
2One; The inboard brushing waterproof paint of electrothermal template, waterproof paint thickness is 5～8mm.
2. method for constructing concrete in frost region according to claim 1 is characterized in that unit of plastic thickness is provided with according to different component in the electrothermal template, and for the beam column template, thickness is 25mm; For the template die plate, thickness is 15mm.
3. method for constructing concrete in frost region according to claim 1, the temperature pick up test frequency when concreting begins that it is characterized in that the template inboard is that 1h tests once, test frequency is that 2h tests once behind the 2h, and test frequency is that 4h tests once behind the 24h.
4. method for constructing concrete in frost region according to claim 2, the temperature pick up test frequency when concreting begins that it is characterized in that the template inboard is that 1h tests once, test frequency is that 2h tests once behind the 2h, and test frequency is that 4h tests once behind the 24h.
5. method for constructing concrete in frost region according to claim 1 is characterized in that: for the different labels concrete, adopt different programming rates; Concrete for C40, programming rate is 15 ℃/h, and for the concrete of C35, programming rate is 14 ℃/h, concrete for C30, programming rate is 13 ℃/h, and for the concrete of C25, programming rate is 12 ℃/h, concrete for C20, programming rate is 11 ℃/h, and for the concrete of C15, programming rate is 10 ℃/h.
6. method for constructing concrete in frost region according to claim 2 is characterized in that: for the different labels concrete, adopt different programming rates; Concrete for C40, programming rate is 15 ℃/h, and for the concrete of C35, programming rate is 14 ℃/h, concrete for C30, programming rate is 13 ℃/h, and for the concrete of C25, programming rate is 12 ℃/h, concrete for C20, programming rate is 11 ℃/h, and for the concrete of C15, programming rate is 10 ℃/h.
7. method for constructing concrete in frost region according to claim 3 is characterized in that: for the different labels concrete, adopt different programming rates; Concrete for C40, programming rate is 15 ℃/h, and for the concrete of C35, programming rate is 14 ℃/h, concrete for C30, programming rate is 13 ℃/h, and for the concrete of C25, programming rate is 12 ℃/h, concrete for C20, programming rate is 11 ℃/h, and for the concrete of C15, programming rate is 10 ℃/h.
8. method for constructing concrete in frost region according to claim 1 is characterized in that: when concrete adopted portland cement, temperature of concrete during construction must not be above 25 ℃; When concrete adopted slag cements, temperature of concrete during construction must not be above 28 ℃; When concrete adopted trass cement, temperature of concrete during construction must not be above 30 ℃; When concrete adopted pulverized fuel ash cement, temperature of concrete during construction must not be above 32 ℃.
9. method for constructing concrete in frost region according to claim 1 is characterized in that: for the different labels concrete, adopt different maintenance processes; Concrete for C40, curing temperature is 7～8 ℃, concrete for C35, curing temperature is 8～9 ℃, and for the concrete of C30, curing temperature is 9～10 ℃, concrete for C25, curing temperature is 10～11 ℃, and for C20 and the concrete below the C20, curing temperature is 11～12 ℃.
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| CN201010113176XA CN101798871B (en) | 2010-01-25 | 2010-01-25 | Method for constructing concrete in frost region |
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| CN201010113176XA CN101798871B (en) | 2010-01-25 | 2010-01-25 | Method for constructing concrete in frost region |
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| CN101798871B true CN101798871B (en) | 2011-07-20 |
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| CN104805935B (en) * | 2015-04-08 | 2017-02-22 | 中国建筑第八工程局有限公司 | Temperature monitoring based crack control method for wall body |
| CN108457413A (en) * | 2018-02-01 | 2018-08-28 | 江苏南通三建建筑装饰有限公司 | A kind of ceiling board mounting structure preventing cracking |
| CN108868143B (en) * | 2018-07-20 | 2020-11-27 | 四川锦城智信建设工程有限公司 | Concrete construction method in cold region in low-temperature season |
| CN110983974B (en) * | 2019-11-21 | 2021-04-30 | 中交第二航务工程局有限公司 | Comprehensive maintenance method for concrete box girder construction in winter |
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Application publication date: 20100811 Assignee: SINOHYDRO Bureau 1 Co.,Ltd. Assignor: Zhu Kui Contract record no.: 2015120000039 Denomination of invention: Method for constructing concrete in frost region Granted publication date: 20110720 License type: Exclusive License Record date: 20150717 |
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Assignee: SINOHYDRO Bureau 1 Co.,Ltd. Assignor: Zhu Kui Contract record no.: 2015120000039 Date of cancellation: 20160701 |
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Effective date of registration: 20160728 Address after: Luyuan District in Jilin province Changchun Kam Road 130062 No. 933 Patentee after: SINOHYDRO Bureau 1 Co.,Ltd. Address before: 325000 Wenzhou City, Ouhai province Jingshan Hill group of the building of the 302 room, room 11, Zhejiang Patentee before: Zhu Kui |