CN104695709B - Adopt the control of concrete cracks method of phase-change material - Google Patents
Adopt the control of concrete cracks method of phase-change material Download PDFInfo
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- CN104695709B CN104695709B CN201510010150.5A CN201510010150A CN104695709B CN 104695709 B CN104695709 B CN 104695709B CN 201510010150 A CN201510010150 A CN 201510010150A CN 104695709 B CN104695709 B CN 104695709B
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Abstract
A kind of control of concrete cracks method adopting phase-change material, belongs to construction engineering technical field, it is characterised in that: comprise the steps: step one: heat exchanged water blood circulation is set at construction location；Step 2: build phase change concrete on the heat-absorbing member of heat exchanged water blood circulation；Step 3: casting concrete, and control temperature in concrete by heat exchanged water blood circulation；Described heat exchanged water blood circulation includes heat-absorbing member and cistern, heat-absorbing member includes heat exchange water pipe and heat exchange sheet metal, cistern includes cold water cistern and hot water cistern, described heat exchange sheet metal is arranged on heat exchange water pipe, one end of heat exchange water pipe connects cold water cistern by water inlet pipe, and the other end connects hot water cistern by outlet pipe.Present configuration is simple, and cost is low, it is possible to the effective temperature controlling inside concrete, and then prevents concrete from producing crack.
Description
Technical field:
The invention belongs to construction engineering technical field, be specifically related to a kind of control of concrete cracks method adopting phase-change material.
Background technology:
Along with the continuous quickening of China's rapid development of economy and Process of Urbanization Construction process, building is on the increase, and wherein Tall Building Foundation and Bridge Piers, cushion cap xoncrete structure are larger in size, and mass concrete construction is more and more general.Large volume concrete structural, it has structure thickness, volume is big, reinforcing bar is close, concreting amount big, construction technical requirement high.One of key of large volume concrete structural construction success or failure is in that how to take practicable technical measures, it is prevented that the generation in crack.Work progress occurring, mass concrete surface cracking directly affects the seismic behavior of building and the service life of building.
During mass concrete construction, cement to send certain heat in hydration process.Internal temperature constantly rises, the maximum temperature of inside concrete is generally up to 60～65 DEG C, and large volume concrete structural thing section is general thicker, the heat that cement sends is gathered in inside works and not easily scatters and disappears, and increases by exponential relationship with concrete age (time).Along with increasing of the growth of the age of concrete, concrete surface and internal difference in temperature increase, concrete intensity and elastic modelling quantity, the constraint that inside concrete cooling is shunk is also just more and more big, so that producing very big tension.When concrete tensile strength is insufficiently resistant to this tension, just start that thermal cracking occurs.Tension is more big, and it is also more big that concrete produces thermal cracking.
Therefore the thermal cracking that hydrated cementitious causes is one of key factor affecting large volume concrete structural stability, durability, control the mass concrete heat of hydration to heat up, reduce temperature difference between inside and outside concrete, avoiding generation and the extension of thermal cracking, to improving, the globality of mass concrete, impermeability and durability are most important.
At present, control in the research of technology at mass concrete internal temperature rise, main from the selection of material, the optimization of concrete mix and start with from the working measure such as precooled aggregate, block placement, coordinate the control adopting the method for water pipe cooling cooling to realize thermal cracking.Since within 1931, adopting, in the U.S. recklessly Buddhist dam process of construction, the internal temperature rise that water pipe cooling reduces mass concrete first, this method becomes one of control most important measure of hydration heat of concrete temperature rise, is worldwide widely applied.But in water pipe cooling process, press close to the concrete thermograde in tube wall position very big, sizable tension can be caused, particularly in mass concrete later stage cooling procedure, it is possible to cause that serious through crack occurs in the structure middle and upper part departing from base restrained area.So, control effect to obtain better mass concrete internal temperature rise, effectively reduce local restriction stress, improve structure anti-cracking safety, it is necessary to inquire into more efficient, more steady, safer hydration heat of concrete temperature rise control new technique.
Summary of the invention:
For solving prior art Problems existing, the present invention proposes a kind of temperature that can adjust well and control inside concrete, and then effectively prevents the control of concrete cracks method of employing phase-change material that mass concrete internal fissure produces.
For achieving the above object, the present invention by the following technical solutions: a kind of control of concrete cracks method adopting phase-change material, comprise the steps:
Step one: heat exchanged water blood circulation is set at construction location；
Step 2: build phase change concrete on the heat-absorbing member of heat exchanged water blood circulation；
Step 3: casting concrete, and control temperature in concrete by heat exchanged water blood circulation；
Described heat exchanged water blood circulation includes heat-absorbing member and cistern, heat-absorbing member includes heat exchange water pipe and heat exchange sheet metal, cistern includes cold water cistern and hot water cistern, described heat exchange sheet metal is arranged on heat exchange water pipe, one end of heat exchange water pipe connects cold water cistern by water inlet pipe, the other end connects hot water cistern by outlet pipe, and hot water cistern is connected with cold water cistern, and water inlet pipe is provided with water pump；
Described phase change concrete is made up of concrete and phase-change material, and the mass ratio of concrete and phase-change material is 5～10, and described phase-change material is mass ratio is the lauric acid-myristic acid-Palmic acid ternary eutectic of 3:2:1.
Described heat exchange sheet metal and heat exchange water pipe are connected with the reinforcing bar phase colligation of inside concrete.
Beneficial effects of the present invention: simple in construction, cost is low, it is possible to the effective temperature controlling inside concrete, and then prevents concrete from producing crack.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of one embodiment of the present of invention；
Fig. 2 is the enlarged partial sectional view of Fig. 1；
Wherein: 1-heat exchange water pipe, 2-water inlet pipe, 3-outlet pipe, 4-phase change concrete, 5-cold water cistern, 6-hot water cistern, 7-water pump, 8-cold and hot pond water-supply-pipe, 9-concrete, 10-heat exchange sheet metal, 11-reinforcing bar.
Detailed description of the invention:
Below in conjunction with drawings and Examples, the present invention is described in further details:
A kind of control of concrete cracks method adopting phase-change material, comprises the steps:
Step one: heat exchanged water blood circulation is set at construction location；Described heat exchanged water blood circulation includes heat-absorbing member and cistern, as shown in Fig. 1～Fig. 2, heat-absorbing member includes some heat exchange water pipes 1 and heat exchange sheet metal 10, heat exchange water pipe 1 is uniformly arranged on construction location, each heat exchange water pipe 1 is evenly arranged with some heat exchange sheet metals 10, cistern includes cold water cistern 5 and hot water cistern 6, one end of every heat exchange water pipe 1 connects cold water cistern 5 by water inlet pipe 2, the other end connects hot water cistern 6 by outlet pipe 3, hot water cistern 6 is connected by cold and hot pond water-supply-pipe 8 with cold water cistern 5, after recirculated water cools down in hot water cistern 6, cold water cistern 5 can be transported to.Water inlet pipe 2 is provided with water pump 7；Heat exchange sheet metal 10 and heat exchange water pipe 1 are connected with the reinforcing bar 11 phase colligation of inside concrete.The internal water heat-transformation produced when concrete 9 solidifies is conducted by reinforcing bar 11, more contributes to phase change concrete 4 and absorbs heat, takes full advantage of the heat-transfer effect of reinforcing bar 11.
Step 2: the heat in heat exchanged water blood circulation exchanges and builds phase change concrete 4 on water pipe 1 and heat exchange sheet metal 10；Described phase change concrete 4 is made up of concrete and phase-change material, and described phase-change material is mass ratio is the lauric acid-myristic acid-Palmic acid ternary eutectic of 3:2:1, and in phase change concrete, the mass ratio of concrete and phase-change material is 5～10.
Step 3: casting concrete 9, in the process of concrete 9 heat release, the internal pre-buried temperature sensor of concrete 9, the temperature of detection inside concrete, start water pump 7 when temperature is higher than 40 DEG C, thus carrying out overall cooling to concrete 9 is internal.When concrete 9 internal temperature is lower than 25 DEG C, stop water pump 7.
After concrete 9 has been built, carry out the heat and moisture preserving maintenance of concrete 9, give full play to the creep property of Cemented, lower temperature stress, at concrete 9 exposed surface covered with plastic film, add a cover straw bag etc..
Water inlet pipe 2, outlet pipe 3 adopt DN40-75mm thin-wall steel tube (zinc-plated inside pipe), heat exchange water pipe 1 adopts DN20-40mm thin-wall steel tube (zinc-plated inside pipe), water inlet pipe 2, outlet pipe 3 are all each independent, heat exchange water pipe 1, water inlet pipe 2, the outlet pipe 3 edge 100cm from concrete 9.
Heat exchange water pipe 1 and heat exchange sheet metal 10 accelerate the heat exchange rate of cold water and phase change concrete 4, effectively absorb the heat of phase change concrete 4.
Phase-change material in phase change concrete 4 is lauric acid-myristic acid-Palmic acid ternary eutectic, its transition temperature range is at 25 DEG C～30 DEG C, in this interval, concrete 9 cured strength can be obviously improved, and the water temperature under room temperature is also below this phase transformation interval range, the heat that phase change concrete 4 absorbs effectively is derived, it is ensured that phase transition process is performed continuously over by heat exchanged water blood circulation.
Claims (2)
1. the control of concrete cracks method adopting phase-change material, it is characterised in that: comprise the steps:
Step one: heat exchanged water blood circulation is set at construction location；
Step 2: build phase change concrete on the heat-absorbing member of heat exchanged water blood circulation；
Step 3: casting concrete, and control temperature in concrete by heat exchanged water blood circulation；In the process of concrete heat release, the pre-buried temperature sensor of inside concrete, the temperature of detection inside concrete, start water pump when temperature is higher than 40 DEG C, thus inside concrete being carried out overall cooling；When concrete internal temperature is lower than 25 DEG C, stop water pump；
Described heat exchanged water blood circulation includes heat-absorbing member and cistern, heat-absorbing member includes heat exchange water pipe and heat exchange sheet metal, cistern includes cold water cistern and hot water cistern, described heat exchange sheet metal is arranged on heat exchange water pipe, one end of heat exchange water pipe connects cold water cistern by water inlet pipe, the other end connects hot water cistern by outlet pipe, and hot water cistern is connected with cold water cistern, and water inlet pipe is provided with water pump；
Described phase change concrete is made up of concrete and phase-change material, and the mass ratio of concrete and phase-change material is 5～10, described phase-change material is mass ratio be 3: 2: 1 lauric acid-myristic acid-Palmic acid ternary eutectic.
2. the control of concrete cracks method of employing phase-change material according to claim 1, it is characterised in that: described heat exchange sheet metal and heat exchange water pipe are connected with the reinforcing bar phase colligation of inside concrete.
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| CN201510010150.5A CN104695709B (en) | 2015-01-09 | 2015-01-09 | Adopt the control of concrete cracks method of phase-change material |
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| CN201510010150.5A CN104695709B (en) | 2015-01-09 | 2015-01-09 | Adopt the control of concrete cracks method of phase-change material |
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| CN104695709A CN104695709A (en) | 2015-06-10 |
| CN104695709B true CN104695709B (en) | 2016-07-27 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904923B (en) * | 2017-03-13 | 2019-07-23 | 中建商品混凝土有限公司 | A kind of large volume eco-concrete and its construction method suitable for torrid areas |
| CN107265947A (en) * | 2017-06-29 | 2017-10-20 | 安徽理工大学 | The massive concrete and its construction technology of a kind of anti-thermal cracking |
| CN107417297A (en) * | 2017-09-13 | 2017-12-01 | 苏交科集团股份有限公司 | Large-volume concrete hydration heat control device and construction method thereof |
| CN109469063B (en) * | 2018-11-21 | 2023-11-07 | 中国电建集团成都勘测设计研究院有限公司 | Cooling water pipe device suitable for thin-wall concrete |
| CN111792945A (en) * | 2020-06-03 | 2020-10-20 | 北京工业大学 | PCM material storage pipeline for reducing hydration heat temperature of mass concrete and construction method |
| CN113565117A (en) * | 2021-06-29 | 2021-10-29 | 中国化学工程重型机械化有限公司 | Winter building construction method |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0431564A (en) * | 1990-05-29 | 1992-02-03 | Taisei Corp | Cooling of mass concrete |
| KR20050099936A (en) * | 2004-03-23 | 2005-10-17 | 염치선 | Hydration heat control system of mass concrete using heat pipe and hydration heat control method form construction method thereof |
| KR20060098407A (en) * | 2006-08-16 | 2006-09-18 | (주)인텔리지오 | Refrigerants circulation type cooling system for concrete dams |
| CN202039605U (en) * | 2011-04-27 | 2011-11-16 | 中建七局第三建筑有限公司 | Water cooling system for concrete |
| CN103485542A (en) * | 2013-09-25 | 2014-01-01 | 中铁大桥局股份有限公司 | System and method for measuring and controlling hydration heat in mass concrete |
| CN204059978U (en) * | 2014-08-13 | 2014-12-31 | 上海建工集团股份有限公司 | The temperature-controlled cooling system of large volume concrete structural |
-
2015
- 2015-01-09 CN CN201510010150.5A patent/CN104695709B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0431564A (en) * | 1990-05-29 | 1992-02-03 | Taisei Corp | Cooling of mass concrete |
| KR20050099936A (en) * | 2004-03-23 | 2005-10-17 | 염치선 | Hydration heat control system of mass concrete using heat pipe and hydration heat control method form construction method thereof |
| KR20060098407A (en) * | 2006-08-16 | 2006-09-18 | (주)인텔리지오 | Refrigerants circulation type cooling system for concrete dams |
| CN202039605U (en) * | 2011-04-27 | 2011-11-16 | 中建七局第三建筑有限公司 | Water cooling system for concrete |
| CN103485542A (en) * | 2013-09-25 | 2014-01-01 | 中铁大桥局股份有限公司 | System and method for measuring and controlling hydration heat in mass concrete |
| CN204059978U (en) * | 2014-08-13 | 2014-12-31 | 上海建工集团股份有限公司 | The temperature-controlled cooling system of large volume concrete structural |
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