A microwave curing method for concrete

A microwave curing and concrete technology, which is applied in the field of concrete curing, can solve the problems of difficult quality assurance, long concrete curing time, high energy consumption, etc., and achieve the effects of reduced energy consumption, good prospects for industrial promotion and application, and reduced energy loss

Active Publication Date: 2021-07-16
GUANGXI ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a microwave curing method for concrete, which uses microwaves to cure concrete, so as to solve the problems of long concrete curing time, difficult quality assurance and high energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A microwave curing method for concrete, comprising the following steps,

[0025] (1) After the concrete is poured and pounded into shape, the surface is covered with a layer of PEEK film, and left to stand for initial setting for 2.5 hours.

[0026] (2) After the initial setting, use a microwave device that can reciprocate in the horizontal direction to carry out preliminary microwave curing for 0.5h, the heating rate is ≤10°C / h, the temperature is controlled at 45°C, the temperature difference between the inside and outside of the concrete is controlled not to exceed 10°C, and the microwave is controlled. The frequency is 915MHz, the power is 10kW, and the output mode is continuous wave.

[0027] (3) Then carry out deep microwave curing for 0.5h, the heating rate is ≤10°C / h, the temperature is controlled at 65°C, the temperature difference between the inside and outside of the concrete is controlled to be no more than 10°C, the microwave frequency is controlled at 915M...

Embodiment 2

[0030] A microwave curing method for concrete, comprising the following steps,

[0031] (1) After the concrete is poured and pounded into shape, the surface is covered with a layer of polytetrafluoroethylene film, and it is allowed to stand for initial setting for 2.5 hours.

[0032] (2) After the initial setting, use a microwave device that can reciprocate in the horizontal direction to carry out preliminary microwave curing for 0.6h, the heating rate is ≤10°C / h, the temperature is controlled at 42°C, the temperature difference between the inside and outside of the concrete is controlled not to exceed 10°C, and the microwave is controlled. The frequency is 5800MHz, the power is 2kW, and the output mode is continuous wave.

[0033] (3) Then conduct deep microwave curing for 0.8h, the heating rate is ≤10°C / h, the temperature is controlled at 62°C, the temperature difference between the inside and outside of the concrete is controlled to be no more than 10°C, the microwave frequ...

Embodiment 3

[0036] A microwave curing method for concrete, comprising the following steps,

[0037] (1) After the concrete is poured and rammed, the surface is covered with a layer of PEEK film, and left to set aside for 3 hours.

[0038] (2) After the initial setting, use a microwave device that can reciprocate in the horizontal direction to carry out preliminary microwave curing for 0.7h, the heating rate is ≤10°C / h, the temperature is controlled at 40°C, the temperature difference between the inside and outside of the concrete is controlled to be no more than 10°C, and the microwave is controlled. The frequency is 6000MHz, the power is 0.5kW, and the output mode is pulse wave.

[0039] (3) Then carry out deep microwave curing for 1 hour, the heating rate is ≤10°C / h, the temperature is controlled at 60°C, the temperature difference between the inside and outside of the concrete is controlled to be no more than 10°C, the microwave frequency is controlled at 6000MHz, the power is 0.5kW, a...

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Abstract

The invention provides a microwave curing method for concrete. The method comprises: (1) after the concrete is poured and pounded into shape, the surface is covered with a layer of film, and left to stand for initial setting for 2 to 3 hours; (2) after the initial setting is completed, use a movable Type microwave device for preliminary microwave curing for 0.5-1h, the temperature is controlled at 35-45°C, and the microwave frequency is 400-6000MHz; (3) followed by deep microwave curing for 0.5-2h, the temperature is controlled at 55-65°C, 400-6000MHz; (4) Finally, the concrete is naturally cooled to room temperature, and the curing is completed. The invention can realize synchronous heating of the inside and outside of the concrete, avoid microstructure damage of the concrete caused by the stress difference caused by excessive temperature difference in the maintenance process, and ensure that the concrete has a standard strength while realizing rapid solidification of the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete maintenance, in particular to a microwave maintenance method for concrete. Background technique [0002] After the concrete is poured, if it is not cured in time, the water in the concrete will evaporate too quickly, forming a dehydration phenomenon, which will make the cement particles that have formed a gel body unable to fully hydrate, cannot be converted into stable crystals, and lack sufficient cohesive force , so that flakes or powders will fall off on the concrete surface. Therefore, the maintenance of the initial stage after concrete pouring is very important. The concrete should be cured immediately after the final setting, and the dry hard concrete should be cured immediately after pouring. [0003] At present, the most widely used concrete curing processes in actual engineering include steam curing, watering (or spraying) curing, spraying curing agents, etc. However, each of the above...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B40/02
CPCC04B40/0218
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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