A concrete dynamic temperature control device and method

Abstract

The application provides a concrete dynamic temperature control device, which is cast in early-age reinforced concrete and comprises a sleeve, the sleeve is wrapped on the outer surface of distribution steel bars, a temperature control structure is arranged on the outer surface of the sleeve, the temperature control structure is arranged as a spiral structure from the upper end of the sleeve to the lower end of the sleeve, the spiral structure comprises an end A attached to the outer surface of the sleeve, an end B gradually shrinks to a closed pointed end structure in the direction of the outside of the sleeve along the end A, a containing space is formed between the end A and the end B, and the end A is a plane with a certain width and arranged along the outer surface of the sleeve. The temperature control structure of the application is attached to the sleeve in the form of a spiral fin, and the outer part of the spiral fin is ribbed. Such a structure can increase the contact area on the one hand, and the steel bars are good heat conductors, which can help the heat conduction to be more uniform, so that the phase change material reacts more uniformly. In addition, the ribbed structure is beneficial to the adhesion between the steel bars and the concrete.

Description

Technical Field

[0001] This invention relates to the field of concrete pouring technology, specifically to a dynamic temperature control device and method for concrete. Background Technology

[0002] Concrete, as a multiphase composite material, has countless applications in the field of civil engineering. With the development of the times, my country is seeing an increasing number of ultra-long and large-volume concrete projects. Due to their large size and large pouring volume, the heat released by cement hydration is concentrated, resulting in a rapid temperature rise. Furthermore, because concrete has poor thermal conductivity, the temperature difference between the inside and outside can easily increase, and the resulting temperature cracks can seriously affect the durability and safety of the components.

[0003] In the prior art, such as CN 117846336 A which discloses a device for adaptive temperature control of large-volume concrete, and the prior art documents such as CN 117215344A, CN 212425888U, and CN 219476034U all improve the external system, that is, add sensors and improve its intelligence, but do not consider how to improve the dynamic temperature control performance by improving the physical structure. Summary of the Invention

[0004] Purpose of the invention: In view of the problem of complex structure of the existing temperature control system for reinforced concrete at middle age, the present invention constructs a dynamic temperature control device for concrete and discloses a dynamic temperature control method for concrete.

[0005] Technical Solution: In one aspect, the present invention provides a dynamic temperature control device for concrete, which is poured into early-age reinforced concrete. The device includes a sleeve that wraps around the outer surface of distributed reinforcing bars. A temperature control structure is provided on the outer surface of the sleeve. The temperature control structure is a spiral structure distributed from the upper end of the sleeve to the lower end of the sleeve. The spiral structure includes end A and end B opposite to end A. End A is attached to the outer surface of the sleeve. End B is a pointed structure that gradually narrows and closes outward from end A towards the outside of the sleeve. An accommodating space is formed between end A and end B. End A is a plane with a certain width that runs along the outer surface of the sleeve.

[0006] Furthermore, including:

[0007] The sleeve has a thickness of 4-6 mm and is made of two composite layers, inner and outer.

[0008] Furthermore, including:

[0009] The outer layer of the sleeve is made of high-quality, soft cross-linked polyolefin material, and the inner layer near the distributed reinforcing bars is made of hot melt adhesive, which has good adhesion to the distributed reinforcing bars.

[0010] Furthermore, including:

[0011] When the reinforced concrete hydrates and releases heat in its early stages, the sleeve shrinks due to heat and is thus fixed to the distributed reinforcing bars.

[0012] Furthermore, including:

[0013] The accommodating space is filled with phase change material and polymer compound. The phase change material is filled in the center of the accommodating space, and the polymer compound is wrapped around the outer layer of the phase change material and fixed together with the sleeve.

[0014] Furthermore, including:

[0015] The phase change material is No. 20 low-melting-point paraffin wax, with an energy storage capacity greater than or equal to 160 kJ / Kg, and the phase change temperature threshold is controlled at 20±2℃.

[0016] Furthermore, including:

[0017] The polymer compound is EPDM rubber with a filling thickness of 1-3 mm.

[0018] On the other hand, the present invention also provides a concrete dynamic temperature control system, which includes a temperature control device, a sensor assembly, and a processor as described above. The sensor assembly is installed in the temperature control device and is used to monitor the temperature of the temperature control device in real time. The processor is used to determine whether the curing temperature has been reached based on the monitored real-time temperature.

[0019] Finally, the present invention also provides a temperature control method implemented by the concrete dynamic temperature control device as described above, the method comprising the following steps:

[0020] S1 begins pouring concrete. The concrete hydrates and releases heat. The sleeve (1) shrinks and adheres to the distributed steel reinforcement layer due to heat.

[0021] S2 determines whether the curing temperature is within the range of 20±2℃. If yes, continue curing; otherwise, proceed to step S3.

[0022] If the curing temperature in step S3 is higher than 22℃, then after the phase change material melts and absorbs heat, curing continues; otherwise, the phase change material solidifies and releases heat, and then proceeds to step S4.

[0023] S4 continues to determine whether the curing temperature is within the range of 20±2℃. If so, continue curing; otherwise, proceed to step S3.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0025] (1) The temperature control structure of the present invention adopts a spiral fin attached to the sleeve, and the spiral fin has external ribs. On the one hand, the ribs themselves increase the contact area, and the steel bars are good conductors of heat, which can help the heat conduction to be more uniform, making the phase change material reaction more uniform; on the other hand, the rib structure is beneficial to the bonding between the steel bars and the concrete.

[0026] (2) The present invention is easy to operate, isolates the steel bars from air and water, reduces the possibility of steel bar corrosion, and through the change of phase change form of phase change material, keeps the temperature of concrete and steel bars in a relatively stable state during concrete curing, intelligently regulates temperature, reduces the possibility of temperature cracks, and enhances the durability of early-age reinforced concrete. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the concrete dynamic temperature control device according to an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the temperature control device described in an embodiment of the present invention;

[0029] Figure 3 This is a flowchart of the temperature control method described in an embodiment of the present invention;

[0030] The diagram includes: sleeve 1, distributed reinforcing bars 2, concrete 3, temperature control structure 4, end A41, end B42, and accommodating space 43. Detailed Implementation

[0031] To better understand the present invention, the technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0032] Example 1

[0033] like Figure 1 and 2As shown, this invention provides a dynamic temperature control device for concrete. The device is cast in early-age reinforced concrete 3. The device includes a sleeve 1 that wraps around the outer surface of distributed reinforcing bars 2. A temperature control structure 4 is provided on the outer surface of the sleeve 1. The temperature control structure 4 is a spiral structure distributed from the upper end to the lower end of the sleeve 1. The spiral structure includes end A41 and end B42 opposite to end A41. End A41 is attached to the outer surface of the sleeve 1. End B42 is a pointed structure that gradually narrows towards the outside of the sleeve 1, forming a closed shape. A receiving space 43 is formed between end A41 and end B42. End A41 is a plane with a certain width that runs along the outer surface of the sleeve 1. The overall shape of the temperature control structure is a spiral fin shape with external ribs. By increasing the surface area of ​​end A41, the friction between it and the sleeve is increased, making the connection between the two tighter.

[0034] In this embodiment, the thickness of sleeve 1 is set to 4-6 mm, preferably 5 mm, and it is made of two composite layers. Specifically, it includes a heat-shrinkable sleeve structure made of polyolefin material with a shrinkage ratio of 2:1, and is made of two composite layers. The outer layer uses high-quality, soft cross-linked polyolefin material, and the inner layer uses hot melt adhesive, which has good adhesion to the reinforcing steel. The outer layer material has the characteristics of insulation, corrosion resistance, and wear resistance, while the inner layer has the advantages of low melting point, waterproof sealing, and high adhesion. When the reinforced concrete 3 hydrates and releases heat in the early age, sleeve 1 shrinks due to heat, fixing the entire sleeve and temperature control structure together to the distributed reinforcing steel 2.

[0035] In this embodiment, the accommodating space 43 is filled with a phase change material and a polymer compound. The phase change material is filled at the center of the accommodating space 43, and the polymer compound is wrapped around the outer layer of the phase change material and fixed together with the sleeve 1. In this embodiment, there are no restrictions on the specific shape of the phase change material and the polymer compound, as long as the polymer compound can completely cover the phase change material.

[0036] Specifically, the phase change material changes based on the influence of the external ambient temperature, preferably but not limited to No. 20 low-melting-point paraffin wax, with an energy storage capacity greater than or equal to 160 kJ / kg, and the phase change temperature threshold is controlled at approximately 20 ± 2℃. The heat transfer rate and temperature distribution of the embedded adaptive phase change material are affected by its arrangement and thickness. The tube length is approximately 1000 mm, the thickness of the embedded adaptive phase change material is 30-32 mm, and the filling rate is 90%-95%.

[0037] The spiral flexible polymer compound is preferably, but not limited to, EPDM rubber. It has a wide operating temperature range, is water-resistant and aging-resistant, is a thermoplastic elastomer, and also has a certain degree of thermal conductivity. Furthermore, the spiral flexible polymer compound is wrapped around the outer layer of the embedded adaptive phase change material, avoiding damage and leakage of the embedded adaptive phase change material.

[0038] A helical flexible polymer compound is coated on the outer layer of an embedded smart phase change material and fixed together with a sleeve. Based on the influence of the thickness of the two layers of embedded adaptive phase change material and helical flexible polymer compound on heat storage / release performance, the thickness of the helical flexible polymer compound is 1-3 mm. Too thin a thickness will reduce the thermal conductivity of the phase change material, while too thick a thickness will greatly increase the risk of leakage.

[0039] In this embodiment, the combination of embedded adaptive phase change material and helical flexible polymer compound results in coordinated deformation and no chemical reaction between the materials. Within a temperature range of approximately 20±2℃, both materials exhibit certain strength and elasticity. Therefore, when a phase change reaction occurs, the overall shape and structure do not undergo significant changes.

[0040] The spiral fin sleeve structure of this invention is easy to operate, isolates the reinforcing steel from air and water, reduces the possibility of steel corrosion, and through the change of phase change morphology of the phase change material, keeps the temperature of concrete and reinforcing steel in a relatively stable state during concrete curing, intelligently regulates the temperature, reduces the possibility of temperature cracks, and enhances the durability of early-age reinforced concrete.

[0041] Example 2

[0042] The present invention also provides a dynamic temperature control system for concrete, which includes the temperature control device, sensor assembly and processor described above. The sensor assembly is installed in the temperature control device and is used to monitor the temperature of the temperature control device in real time. The processor is used to determine whether the curing temperature has been reached based on the monitored real-time temperature.

[0043] Example 3

[0044] like Figure 3 As shown, this invention also provides a method for dynamic temperature control of concrete. This method utilizes the large amount of heat released during concrete hydration, causing the sleeve to shrink under heat and be fixed to the distributed reinforcing bars. Once the curing temperature reaches a threshold, dynamic temperature control is achieved by altering the phase change morphology of an embedded adaptive phase change material. This enables temperature-controlled phase change curing of the distributed reinforcing bars and early-age reinforced concrete. The method includes the following steps:

[0045] S1 begins pouring concrete. The concrete hydrates and releases heat. The sleeve shrinks and adheres to the distributed steel reinforcement layer due to the heat.

[0046] S2 determines whether the curing temperature is within the range of 20±2℃. If yes, continue curing; otherwise, proceed to step S3.

[0047] If the curing temperature in step S3 is higher than 22℃, then after the phase change material melts and absorbs heat, curing continues; otherwise, the phase change material solidifies and releases heat, and then proceeds to step S4.

[0048] S4 continues to determine whether the curing temperature is within the range of 20±2℃. If so, continue curing; otherwise, proceed to step S3.

[0049] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0050] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if these modifications and variations to the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A concrete dynamic temperature control device, which is cast in a reinforced concrete (3) at an early age, characterized in that, The device includes a sleeve (1), which is wrapped around the outer surface of the distributed reinforcing bars (2). A temperature control structure (4) is provided on the outer surface of the sleeve (1). The temperature control structure (4) is a spiral structure distributed from the upper end of the sleeve (1) to the lower end of the sleeve (1). The spiral structure includes an end A (41) and an end B (42) opposite to the end A (41). The end A (41) is attached to the outer surface of the sleeve (1). The end B (42) is a pointed structure that gradually narrows and closes along the outer direction of the sleeve (1) from the end A (41). An accommodating space (43) is formed between the end A (41) and the end B (42). The end A (41) is a plane with a certain width and is set along the outer surface of the sleeve (1). The accommodating space (43) is filled with phase change material and polymer compound. The phase change material is filled in the center of the accommodating space (43), and the polymer compound is wrapped around the outer layer of the phase change material and fixed together with the sleeve (1).

2. The concrete dynamic temperature control device of claim 1, wherein, The sleeve (1) has a thickness of 4~6mm and is made of two composite layers, inner and outer.

3. The concrete dynamic temperature control device of claim 2, wherein, The outer layer of the sleeve (1) is made of high-quality, soft cross-linked polyolefin material, and the inner layer near the distribution steel bar (2) is made of hot melt adhesive, which has good adhesion to the distribution steel bar (2).

4. The concrete dynamic temperature control device of claim 3, wherein, The sleeve (1) shrinks when the reinforced concrete (3) is hydrated and released heat in the early age, and is fixed to the distributed steel bars (2).

5. The concrete dynamic temperature control device of claim 1, wherein, The phase change material is No. 20 low-melting-point paraffin wax, with an energy storage capacity greater than or equal to 160 kJ / Kg, and the phase change temperature threshold is controlled at 20±2℃.

6. The concrete dynamic temperature control device of claim 1, wherein, The high molecular compound adopts EPDM rubber, and the filling thickness is 1-3 mm .

7. A dynamic temperature control system for concrete, characterized in that, The system includes a temperature control device, a sensor assembly, and a processor as described in any one of claims 1-6. The sensor assembly is disposed in the temperature control device and is used to monitor the temperature of the temperature control device in real time. The processor is used to determine whether the maintenance temperature has been reached based on the monitored real-time temperature.

8. A method of temperature control implemented by the dynamic temperature control device for concrete according to claim 5, characterized in that, The method includes the following steps: S1 begins pouring concrete. The concrete hydrates and releases heat. The sleeve (1) shrinks and adheres to the distributed steel reinforcement layer due to heat. S2 determines whether the curing temperature is within the range of 20±2℃. If yes, continue curing; otherwise, proceed to step S3. If the curing temperature in step S3 is higher than 22℃, then after the phase change material melts and absorbs heat, curing continues; otherwise, the phase change material solidifies and releases heat, and then proceeds to step S4. S4 continues to determine whether the curing temperature is within the range of 20±2℃. If so, continue curing; otherwise, proceed to step S3.

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