Concrete microwave curing method
By injecting water into a sealed curing tank to create a saturated steam environment, combined with microwave heating and constant temperature control, the problems of uneven humidity and temperature were solved, enabling rapid and uniform curing of concrete samples and improving hydration reaction efficiency and mechanical properties.
Patent Information
- Application Number
- CN202511175709.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-21
- Publication Date
- 2025-11-07
AI Technical Summary
Existing microwave curing techniques suffer from inaccurate humidity control and uneven temperature and humidity field distribution, leading to discontinuous hydration reactions in concrete specimens, which can easily cause local overheating and dehydration cracking, thus affecting the curing effect.
Before heating the concrete sample, water is injected into the sealed curing tank to form a stable saturated steam environment. The curing tank is then heated by a microwave heating box to ensure uniform humidity and temperature inside the tank. The heating process is controlled by constant temperature heating and ventilation cooling.
It accelerated the hydration reaction rate of concrete samples, reduced porosity, improved the mechanical properties and durability of concrete samples, and enhanced the curing effect.
Smart Images
Figure CN120902102A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of concrete curing technology, and in particular to a method for microwave curing of concrete. Background Technology
[0002] With the continuous development of the construction industry, concrete has become an important component of the main structure of buildings, and its construction efficiency and quality assurance are key concerns in the construction industry. After concrete is poured and formed, it needs to be cured under suitable temperature and humidity conditions to ensure that the hydration reaction of cement inside the concrete is fully carried out, thereby obtaining better strength and durability.
[0003] Currently, commonly used curing methods mainly include natural curing, steam curing, and microwave curing. Among them, microwave curing is a curing method that uses the penetrability of electromagnetic waves to make water molecules vibrate rapidly in an electromagnetic field, thereby achieving synchronous heating inside and outside the concrete specimen. It has the advantages of fast heating and low energy consumption, and has received widespread attention in the field of building construction in recent years.
[0004] However, existing microwave curing technologies often suffer from inaccurate humidity control and uneven temperature and humidity field distribution, resulting in discontinuous hydration reaction processes in concrete specimens and easily causing local overheating, water loss, and cracking of concrete specimens, thus seriously affecting the curing effect of concrete. Summary of the Invention
[0005] The purpose of this invention is to provide a method for microwave curing of concrete, which can accelerate the curing speed and improve the curing effect.
[0006] To achieve this objective, the present invention adopts the following technical solution:
[0007] Microwave curing methods for concrete include:
[0008] S1. Place the concrete sample into the curing tank, inject water for humidification into the curing tank, and seal the curing tank;
[0009] S2. Place the curing container into the heating cavity of the microwave heating box, and start the microwave heating box to heat the curing container;
[0010] S3. When the humidity inside the curing tank reaches saturation, continue heating the curing tank until the temperature of the curing tank reaches the set temperature.
[0011] S4. The curing tank is continuously heated at the set temperature until the set heating time is reached;
[0012] S5. Stop heating the curing tank and remove the concrete sample from the curing tank.
[0013] As preferably, the step S1 specifically comprises:
[0014] Placing the concrete sample into a top-opened containing mold;
[0015] Placing the containing mold into the curing tank;
[0016] Injecting water into the curing tank, and the water level is lower than the height of the containing mold;
[0017] Installing the cover plate of the curing tank on the body of the curing tank, so that the inside of the curing tank forms a sealed environment.
[0018] As preferably, the containing mold and the curing tank are provided with a plurality of one-to-one correspondence.
[0019] As preferably, the top section of the curing tank is arc-shaped away from the concrete sample.
[0020] As preferably, before stopping heating the curing tank in the step S5, it further comprises:
[0021] Lowering the heating power of the microwave heating box, so that the temperature in the heating cavity gradually decreases.
[0022] As preferably, after gradually decreasing the temperature in the heating cavity, it further comprises:
[0023] Ventilating and cooling the curing tank.
[0024] As preferably, before taking out the concrete sample in the curing tank in the step S5, it further comprises:
[0025] Releasing pressure of the curing tank.
[0026] The present application has the following beneficial effects:
[0027] The concrete microwave curing method provided by the application, before heating the concrete sample by using a microwave heating box, water is first injected into the curing tank, and then the concrete sample is placed into the curing tank and the curing tank is subjected to microwave heating. Since the curing tank is sealed, the water in the curing tank will evaporate to form water vapor after being heated, thereby forming a stable saturated steam environment in the curing tank, further accelerating the temperature rising speed in the curing tank. At the same time, since the water in the curing tank evaporates to form saturated steam in the curing tank, the outward migration of the water contained in the concrete sample is inhibited, ensuring the continuous and sufficient progress of the hydration reaction in the concrete sample. Since the humidity in the curing tank is in a saturated state during the entire curing process, and the curing tank is continuously heated after the temperature reaches the set temperature, the concrete sample is cured in a closed and high-temperature and high-humidity environment, which can greatly accelerate the hydration reaction rate in the concrete sample, and help the deposition and densification of hydration products in the voids of the concrete sample, thereby reducing the porosity of the concrete sample, improving the mechanical properties and durability of the concrete sample, and further greatly improving the curing effect. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 is a structure diagram of the curing tank provided by the embodiment of the application.
[0029] In the drawings:
[0030] 100 - concrete sample;
[0031] 200 - curing tank;
[0032] 300 - accommodating mold. DETAILED DESCRIPTION
[0033] The application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the application, and not to limit the application. In addition, it should be noted that, for the convenience of description, only the parts related to the application are shown in the drawings, not all the structures.
[0034] In the description of the application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.
[0035] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher in horizontal height than the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is lower in horizontal height than the second feature.
[0036] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and the like orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in description, and have no special meaning.
[0037] As shown in Figure 1 The present application provides a concrete microwave curing method, which comprises the following steps: S1, placing a concrete sample 100 into a curing tank 200, injecting water for humidification into the curing tank 200, and sealing the curing tank 200; S2, placing the curing tank 200 into a heating cavity of a microwave heating box, and starting the microwave heating box to heat the curing tank 200; S3, when the humidity in the curing tank 200 reaches a saturation state, continuing to heat the curing tank 200 until the temperature of the curing tank 200 reaches a set temperature; S4, continuously heating the curing tank 200 at the set temperature until a set heating time is reached; S5, stopping heating the curing tank 200, and taking out the concrete sample 100 in the curing tank 200.
[0038] In the embodiment, before the concrete sample 100 is heated by using the microwave heating box, water is first injected into the curing tank 200, and then the concrete sample 100 is placed in the curing tank 200, and the curing tank 200 is subjected to microwave heating. Since the curing tank 200 is sealed, the water in the curing tank 200 will evaporate to form water vapor after being heated, thereby forming a stable high-humidity environment in the curing tank 200, further accelerating the heating speed in the curing tank 200. At the same time, since the water in the curing tank 200 evaporates to form saturated air in the curing tank 200, the evaporation of the water contained in the concrete sample 100 is inhibited, ensuring the continuous and sufficient hydration reaction of the concrete sample 100. Since the humidity in the curing tank 200 is in a saturated state during the entire curing process, and the curing tank 200 is continuously heated after the temperature reaches the set temperature, the concrete sample 100 is cured in a closed and high-temperature and high-humidity environment, which can greatly accelerate the hydration reaction rate inside the concrete sample 100, and help the deposition and densification of hydration products in the pores of the concrete sample 100, thereby reducing the porosity of the concrete sample 100, improving the impermeability and frost resistance of the concrete sample 100, and further greatly improving the curing effect.
[0039] Specifically, the microwave heating box is a microwave device commonly used in the art, which is made of high-temperature resistant ceramic fiber inside and coated with a microwave reflective coating, and the outside of the microwave heating box is coated with stainless steel. The curing tank 200 is placed in the heating cavity of the microwave heating box, and the curing tank 200 is provided with a temperature sensor and a humidity sensor, so as to monitor the temperature and humidity inside the curing tank 200. When curing the concrete sample 100, since the curing tank 200 is a closed structure, when the curing tank 200 is heated, the water in the curing tank 200 evaporates to form water vapor, which increases the pressure in the curing tank 200, thereby increasing the saturation temperature of the air in the curing tank 200 and reducing the water evaporation in the concrete sample 100, thereby improving the humidity conditions of the capillary pores inside the concrete sample 100. At the same time, in the closed high-pressure and high-humidity environment of the curing tank 200, the heating speed and temperature uniformity in the curing tank 200 are also improved, thereby achieving rapid and uniform curing effect of the concrete sample 100. The set temperature in step S3 and the set time in step S4 need to be set according to the actual situation. It can be understood that in steps S3 and S4, the air in the curing tank 200 is in a saturated humidity state.
[0040] Specifically, the step S1 specifically comprises: placing the concrete sample 100 into the top-opened accommodating mold 300; placing the accommodating mold 300 into the curing tank 200; injecting water into the curing tank 200, and the water level is lower than the height of the accommodating mold 300; installing the cover plate of the curing tank 200 on the body of the curing tank 200 to form a sealed environment inside the curing tank 200. In the embodiment, the accommodating mold 300 is made of Teflon and is used for accommodating the fresh and un-solidified concrete sample 100, and the top of the accommodating mold 300 is open; the curing tank 200 has water for humidification, and the water level is lower than the height of the accommodating mold 300 to avoid the water flowing into the accommodating mold 300 and affecting the hydration reaction of the concrete sample 100; the accommodating mold 300 can also be made of other materials with high temperature resistance and non-stickiness in the art, which are not limited herein. The curing tank 200 is composed of an inner layer of polytetrafluoroethylene and an outer layer of polypropylene, and the outside is reinforced by a steel mesh to ensure that the curing tank 200 has excellent chemical resistance and structural strength.
[0041] In order to accelerate the curing efficiency of the concrete sample 100, the accommodating mold 300 and the curing tank 200 are provided in plurality in one-to-one correspondence; in the embodiment, when the concrete sample 100 is cured, a plurality of curing tanks 200 are placed in the microwave heating box at the same time, and the accommodating mold 300 is placed in each curing tank 200 to heat the concrete sample 100; the microwave heating box can simultaneously heat and cure a plurality of groups of concrete samples 100, improve the curing efficiency, and also can compare and comprehensively analyze the curing results of different groups of concrete samples 100 to obtain more accurate curing results.
[0042] The top section of the curing tank 200 is arc-shaped away from the concrete sample 100, and the condensate water generated during the curing process will slide along the top of the arc and finally flow back to the bottom of the curing tank 200 along the side wall of the curing tank 200, thereby avoiding the water droplets falling onto the concrete sample 100 in the accommodating mold 300 below; specifically, during the heating process of the curing tank 200, the moisture inside the curing tank 200 will evaporate to form water vapor, part of the water vapor will move upward and condense to form water droplets when contacting the top of the curing tank 200, and due to the arc-shaped structure of the top of the curing tank 200, the water droplets will flow to both sides along the top of the curing tank 200, and finally flow back to the bottom of the curing tank 200 along the side wall of the curing tank 200, thereby avoiding the water droplets falling onto the concrete sample 100 in the accommodating mold 300 below to affect the curing quality of the concrete sample 100.
[0043] To further ensure the curing quality of the concrete sample 100, before stopping heating the curing tank 200 in step S5, it further includes gradually reducing the heating power of the microwave heating box to gradually reduce the temperature in the heating cavity. Specifically, step S4 is to perform constant temperature heating on the curing tank 200, and when the constant temperature heating stage ends, the staff gradually reduces the heating power of the microwave heating box, so that the temperature in the heating cavity gradually reduces, and the heating function of the microwave heating box is completely turned off to avoid the temperature in the heating cavity suddenly dropping to cause thermal cracks of the concrete sample 100.
[0044] After gradually reducing the temperature in the heating cavity, it further includes ventilating and cooling the curing tank 200; in the embodiment, after the microwave heating box is completely turned off, the staff turns on the fan inside the heating cavity to blow air flow to the curing tank 200 to cool the curing tank 200, so as to quickly reduce the pressure of the curing tank 200, and also avoid scalding the staff in the process of taking out the curing tank 200.
[0045] Before taking out the concrete sample 100 in the curing tank 200 in step S5, it further includes reducing the pressure of the curing tank 200. Specifically, the curing tank 200 is provided with a pressure relief valve, and the pressure relief valve has a set safety pressure value; when the air pressure inside the curing tank 200 is greater than the safety pressure value, the pressure relief valve is automatically opened to reduce the pressure inside the curing tank 200, so as to ensure the safety of the curing process; after the curing ends, the staff needs to ventilate and cool the curing tank 200 first, and when the temperature of the curing tank 200 is reduced to below the safety temperature, the staff opens the door of the microwave heating box and takes out the curing tank 200, and then manually opens the pressure relief valve of the curing tank 200 to discharge the high-pressure air inside, until the internal and external pressures are similar or the same; after the pressure in the final curing tank 200 is stable and the temperature is reduced to room temperature, the curing tank 200 is opened to take out the concrete sample 100.
[0046] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the present application. Here, it is unnecessary and impossible to exhaust all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.
Claims
1. A method for microwave curing of concrete, characterized in that, The method comprises the following steps: S1, placing a concrete sample (100) into a curing tank (200), injecting water for humidification into the curing tank (200), and sealing the curing tank (200); S2, placing the curing tank (200) into a heating cavity of a microwave heating box, starting the microwave heating box, and heating the curing tank (200); S3, when the humidity in the curing tank (200) reaches a saturated state, continuing to heat the curing tank (200) until the temperature of the curing tank (200) reaches a set temperature; S4, continuously heating the curing tank (200) at the set temperature until a set heating time is reached; S5, stopping heating the curing tank (200), and taking out the concrete sample (100) in the curing tank (200).
2. The method of claim 1, wherein Step S1 specifically comprises: placing the concrete sample (100) into a top-open accommodating mold (300); placing the accommodating mold (300) into the curing tank (200); injecting water into the curing tank (200), and the water level is lower than the height of the accommodating mold (300); installing a cover plate of the curing tank (200) on the body of the curing tank (200) to form a sealed environment inside the curing tank (200).
3. The method of claim 2, wherein the microwave curing is performed at a frequency of 915 MHz. The accommodating mold (300) and the curing tank (200) are one-to-one correspondingly provided with a plurality of.
4. The method of claim 1, wherein the concrete is cured by microwaves. The top section of the curing tank (200) is arc-shaped away from the concrete sample (100).
5. The method of claim 1, wherein the concrete is cured by microwaves. Before stopping heating the curing tank (200) in step S5, it further comprises: reducing the heating power of the microwave heating box, and gradually reducing the temperature in the heating cavity.
6. The method of claim 5, wherein the concrete is cured by microwaves. After gradually reducing the temperature in the heating cavity, it further comprises: venting and cooling the curing tank (200).
7. The concrete microwave curing method according to any one of claims 1 to 6, characterized in that, Before taking out the concrete sample (100) in the curing tank (200) in step S5, it further comprises: venting the curing tank (200).