Microwave curing method for block

A technology of microwave curing and building blocks, which is applied in the direction of ceramic molding machines and manufacturing tools, can solve the problems of high energy consumption, long curing time of blocks, and difficulty in quality assurance, so as to achieve stable material dimensions, avoid structural defects, and save energy. The effect of reducing consumption

Active Publication Date: 2020-03-31
GUANGXI ACAD OF SCI +2
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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 blocks, which uses microwaves t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1

[0023] A microwave curing method for building blocks includes the following steps:

[0024] (1) Inject the slurry into the test mold, cover it with a PEEK film, and let it stand for 3 hours for pre-curing, and the temperature is controlled to 45°C.

[0025] (2) After the pre-curing is completed, cut with steel wire to obtain the uncured block, then re-cover with the original covering film and transfer it into the microwave reaction chamber for microwave heating and curing for 1 hour. The microwave frequency is 2450MHz and the power is 0.5kW. The output mode is continuous wave; the microwave heating and curing is divided into three stages: the first stage is heated to 60°C and kept for 20 minutes, the second stage is raised to 70°C for 20 minutes, and the third stage is cooled to 60°C for 30 minutes, and the first stage is controlled. The heating rate is 3°C / min, the heating rate in the second stage is 2°C / min, and the cooling rate in the third stage is 2°C / min; ea...

Example Embodiment

[0027] Example 2

[0028] A microwave curing method for building blocks includes the following steps:

[0029] (1) Inject the slurry into the test mold, cover it with a polytetrafluoroethylene film, and leave it to stand for 2.5 hours for pre-curing, and the temperature is controlled to 40°C.

[0030] (2) After the pre-curing is completed, cut with steel wire to obtain the uncured block, then re-cover it with the original covering film and transfer it to the microwave reaction chamber for microwave heating and curing for 1 hour. The microwave frequency is 915MHz, the power is 5kW, and the output is The method is continuous wave; the microwave heating and curing is divided into three stages: the first stage raises the temperature to 55℃ and keeps 22min, the second stage raises the temperature to 65℃ and keeps 23min, the third stage reduces the temperature to 55℃ and keeps 35min, control the first stage heating The rate is 4°C / min, the heating rate in the second stage is 2°C / min, and ...

Example Embodiment

[0032] Example 3

[0033] A microwave curing method for building blocks includes the following steps:

[0034] (1) Inject the slurry into the test mold, cover it with a PEEK film, and let it stand for 2 hours for pre-curing, and the temperature is controlled to 35°C.

[0035] (2) After the pre-curing is completed, cut with steel wire to obtain the uncured block, then re-cover it with the original covering film and transfer it into the microwave reaction chamber for microwave heating and curing for 1.5h. The microwave frequency is 2450MHz and the power is 3kW. The output mode is a combination of continuous wave and pulse wave; microwave heating maintenance is divided into three stages: the first stage is heated to 55°C for 25 minutes, the second stage is raised to 70°C for 25 minutes, and the third stage is cooled to 55°C Keep it for 40 minutes, control the heating rate of the first stage to 2℃ / min, the heating rate of the second stage to 1℃ / min, and the cooling rate of the third sta...

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Abstract

The invention provides a microwave curing method for a block. The method includes steps that (1) slurry is injected into a test mold, covered by a film, and is subjected to standing and pre curing for2-4 hours, and the temperature is controlled at 30-45 DEG C; (2) after pre curing, a steel wire is used to cut an uncured block, and then the film is utilized to re-cover and transferred to a microwave reaction chamber for 1-2 hours, the temperature is controlled at 50-70 DEG C, and the microwave frequency is 433-2450 MHz; and (3) after microwave heating and curing, the block is naturally cooledto room temperature, and curing is completed. The method is advantaged in that a microwave source with the specific frequency of 433-2450 MHz has the characteristics of deep acting depth, which can realize synchronous heating of the whole block inside and outside so that the temperature of each part of the block is uniform, and the stress damage caused by temperature difference is avoided, and themethod can realize fast curing of the block, improve production efficiency, and realize energy conservation and environmental protection.

Description

technical field [0001] The invention belongs to the technical field of block maintenance, in particular to a microwave maintenance method for blocks. Background technique [0002] The energy consumption of buildings is very huge, and the development of new wall materials to reduce the energy loss of building envelopes is one of the main measures to improve the energy efficiency of buildings. New wall materials can be divided into three categories: blocks, bricks and plates in terms of use. At present, a large category of new wall materials commonly used in China is non-sintered concrete blocks, mainly including ceramsite concrete blocks and ordinary concrete blocks. blocks, fly ash, sand, slag aerated concrete blocks, etc. As blocks are paid more and more attention in the field of construction, the maintenance methods in the preparation process of blocks should also be adjusted accordingly to meet the needs of development under the new situation. [0003] The current block...

Claims

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Application Information

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IPC IPC(8): B28B11/24C04B40/02
CPCB28B11/241B28B11/245C04B40/0218
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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