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A microwave curing method for pc prefabricated parts

A technology for microwave curing and prefabrication, applied in the field of construction, can solve the problems of long curing time and difficult quality assurance of PC prefabricated parts, and achieve the effects of good industrial promotion and application prospects, fast curing speed, and shortened curing time.

Active Publication Date: 2021-06-22
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a microwave curing method for PC prefabricated parts, using microwaves to maintain PC prefabricated parts, so as to solve the problems of long curing time and difficult quality assurance of PC prefabricated parts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A microwave curing method for PC prefabricated parts, comprising the following steps:

[0025] (1) Inject the aggregate into a mold made of polytetrafluoroethylene to form an uncured PC prefabricated part, and the area of ​​the PC prefabricated part is greater than 0.1m2 2 , the thickness is greater than 0.1m, put it aside for initial setting curing for 3h.

[0026] (2) Place the PC preform together with the mold in the microwave curing reaction chamber.

[0027] (3) Utilize microwaves to heat the PC preform in the microwave curing reaction chamber, set the microwave frequency to 915MHz, and the power of the microwaves to be 600W / m 3 , control the heating rate of the previous stage to be 6°C / min, the heating time is 5min, the heating rate of the middle stage is 4°C / min, and the heating time is 20min, the heating rate of the latter stage is 2°C / min, and the heating time is 5min, The temperature control range is 50±5°C, so that the PC preform can be completely cured; du...

Embodiment 2

[0030] A microwave curing method for PC prefabricated parts, comprising the following steps:

[0031] (1) Inject the aggregate into a mold made of polytetrafluoroethylene to form an uncured PC prefabricated part, and the area of ​​the PC prefabricated part is greater than 0.1m2 2 , the thickness is greater than 0.1m, put it aside for initial setting curing for 3h.

[0032] (2) Place the PC preform together with the mold in the microwave curing reaction chamber.

[0033] (3) Utilize microwaves to heat the PC preform in the microwave curing reaction chamber, set the microwave frequency to 3000MHz, and the power of the microwaves to be 200W / m 3 , control the heating rate of the previous stage to be 5°C / min, the heating time is 7min, the heating rate of the middle stage is 3°C / min, the heating time is 25min, the heating rate of the latter stage is 2°C / min, and the heating time is 7min, The temperature control range is 55±5°C, so that the PC preform can be completely cured; durin...

Embodiment 3

[0036] A microwave curing method for PC prefabricated parts, comprising the following steps:

[0037] (1) Inject the aggregate into a mold made of polytetrafluoroethylene to form an uncured PC prefabricated part, and the area of ​​the PC prefabricated part is greater than 0.1m2 2 , the thickness is greater than 0.1m, put it aside for initial setting and curing for 2.5h.

[0038] (2) Place the PC preform together with the mold in the microwave curing reaction chamber.

[0039] (3) Utilize microwaves to heat the PC preform in the microwave curing reaction chamber, set the microwave frequency to 2450MHz, and the power of the microwaves to be 400W / m 3 , control the heating rate in the previous stage to be 7°C / min, the heating time is 8min, the heating rate in the middle stage is 4°C / min, the heating time is 30min, the heating rate in the latter stage is 2°C / min, and the heating time is 8min, The temperature control range is 45±5°C, so that the PC preform is completely cured; dur...

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Abstract

The invention discloses a microwave curing method for a PC prefabricated part. The method comprises: (1) injecting aggregate into a mold to form an uncured PC prefabricated part, and standing for initial curing for 2-3 hours; (2) making the PC The preform is placed in the microwave curing reaction chamber together with the mold; (3) microwaves are used to heat the PC preform in the microwave curing reaction chamber, the microwave frequency is set to 300-3000MHz, and the heating rate in the previous stage of control is 3 ‑8°C / min, the heating rate in the middle section is 2‑5°C / min, the heating rate in the later stage is 1‑3°C / min, and the temperature control range is 40‑60±5°C, so that the PC preform is completely cured; (4) Open the microwave curing reaction chamber, take out the PC preform, and then perform demoulding treatment to obtain a cured PC preform, then cool it down to room temperature in the natural environment, and naturally maintain it for 3-5 days, which is completed Maintenance of PC prefabricated parts.

Description

technical field [0001] The invention belongs to the technical field of construction, and in particular relates to a microwave curing method for PC prefabricated parts. Background technique [0002] In recent years, with the development of the construction industry, more and more people choose PC prefabricated parts (precast concrete, concrete prefabricated parts) when building houses. Compared with traditional cast-in-place concrete, the construction environment of PC prefabricated parts is PC The factory is safer than on-site construction; and the installation speed and construction progress can be significantly improved through prefabricated dimensions; in addition, the on-site workload of PC prefabricated parts is significantly reduced, which can effectively reduce dust pollution and noise pollution. [0003] An important link in the production of PC prefabricated parts is the curing of PC prefabricated parts. At present, the curing of PC prefabricated parts is usually ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B28B11/24
CPCB28B11/245
Inventor 黄志民黄慨顾传君冼学权黄绍权黄华林
Owner GUANGXI ACAD OF SCI
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