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Test method and device for acquiring steam curing parameters of prefabricated part at low temperature and steam curing method

A prefabricated component and parameter acquisition technology, applied in manufacturing tools, ceramic molding machines, etc., can solve problems such as uncontrollable temperature, large steam loss, quality problems, etc., to improve mold turnover rate, better product quality, and reduce steam curing cost effect

Inactive Publication Date: 2020-04-07
ZHONGTIAN CONSTR GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] To sum up, the problems existing in the existing technology are: the steam curing device of the fixed mold table is not reasonable, the steam loss is large, and the utilization rate is low; the steam curing of prefabricated components does not specify the steam curing parameter values ​​for different mold entry temperatures, and now Stage prefabricated components have high cost of steam curing, and components often have quality problems after steam curing.
Solve the problems of uncontrollable temperature, poor thermal insulation and uneven heating temperature of concrete during the curing process

Method used

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  • Test method and device for acquiring steam curing parameters of prefabricated part at low temperature and steam curing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The present invention is carried out in conjunction with the production line of the fixed mold table, the temperature probe is placed in the curing shed, and the temperature is controlled by an automatic temperature control valve;

[0050] The concrete mix ratio was fixed throughout the test;

[0051] Steam curing is divided into four stages: static stop stage, heating stage, constant temperature stage, and cooling stage

[0052] When the mold entry temperature is 5°C, the static stop temperature is calculated 4 hours from the completion of concrete pouring, and the static stop temperature is 20°C.

[0053] In the heating stage, the heating rate is 20°C / h, and the heating time is 1 hour

[0054] The constant temperature is 40°C, and the constant temperature time is 4h;

[0055] The cooling rate is 10°C / h, and the cooling time is 3.5 hours.

[0056] The curing time for the whole stage from static stop to cooling is 12.5h.

[0057] The heating rate is controlled by sett...

Embodiment 2

[0060] When the mold entry temperature is 10°C, the static stop temperature is calculated for 5 hours from the completion of concrete pouring, and the static stop temperature is 30°C.

[0061] The constant temperature is 30°C, and the constant temperature time is 4h;

[0062] The cooling rate is 10°C / h, and the cooling time is 2.5 hours.

[0063] The curing time for the whole stage from static stop to cooling is 11.5h.

[0064] It has been verified that after 11.5 hours of steam curing, the demoulding strength is 22.6Mpa, which meets the mold release strength, and the quality of the components is good. After the steam curing is transferred to the standard curing, the 3d strength is 38.2, and the 7d age strength is 44.4Mpa. The law of strength growth does not affect the growth of strength in the later stage.

Embodiment 3

[0066] When the mold entry temperature is 15°C, the static stop temperature is calculated 4 hours from the completion of concrete pouring, and the static stop temperature is 30°C.

[0067] The constant temperature is 50℃, and the constant temperature time is 3h;

[0068] The cooling rate is 10°C / h, and the cooling time is 4.5 hours.

[0069] The curing time for the whole stage from static stop to cooling is 12h.

[0070] It has been verified that after 12 hours of steam curing, the demoulding strength is 26.6Mpa, which meets the mold release strength, and the quality of the components is good. After the steam curing is transferred to the standard curing, the 3d strength is 34.2, and the 7d age strength is 39.2Mpa. The law of strength growth does not affect the growth of strength in the later stage.

[0071]

[0072] As can be seen from the comparison in the above table, it can be seen that the ejection strength of prefabricated components that meets the specification requ...

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Abstract

The invention belongs to the technical field of building prefabricated part improvement, and discloses a test method and device for acquiring the steam curing parameters of a prefabricated part at a low temperature and a steam curing method. The test method comprises the following steps: arranging a steam curing shed on a fixed mold platform; preparing concrete to be poured, and pouring the concrete onto the fixed mold platform, wherein the pouring temperature of the concrete is 5 to 15 degrees centigrade; introducing steam with different temperatures into the steam curing shed, and performinga curing comparison test which is divided into four stages including a standing stage, a heating stage, a constant-temperature stage and a cooling stage; arranging a temperature probe in the curing shed, and adjusting the temperature of the steam according to the temperature requirement in each stage; and determining whether the stripping strength is satisfied or not, and keeping the steam curingparameters satisfiying the stripping strength. The method specifies better steam curing parameters for different pouring temperatures (5, 10 and 15 degrees centigrade) of concrete at a low temperature, shortens the steam curing time, improves the mold turnover rate and reduces the steam curing cost.

Description

technical field [0001] The invention belongs to the field of building prefabricated components, and in particular relates to a test method and device for obtaining steam curing parameters of prefabricated components at low temperature, and a steam curing method. Background technique [0002] The maintenance of traditional concrete prefabricated components includes natural curing, steam curing, hot-mix concrete thermal mold curing, solar curing, and far-infrared curing. Two methods are commonly used: natural curing and steam curing. The natural maintenance cost is low, simple and easy, but the maintenance time is long, the turnover rate of the formwork is low, and it occupies a large space. Steam curing can shorten the maintenance time, the turnover rate of the formwork is correspondingly increased, and the occupied space is greatly reduced. Steam curing is to place the components in a curing room with saturated steam or a mixture of steam and air, and perform curing in a rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B11/24
CPCB28B11/245
Inventor 段志伟牛超高杨张立贾鑫鑫李雪
Owner ZHONGTIAN CONSTR GROUP
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