Mass concrete temperature crack control system based on phase change temperature control

Abstract

The invention discloses a mass concrete temperature crack control system based on phase change temperature control, and belongs to the technical field of mass concrete construction. The system comprises: a concrete skin; the first pipeline is arranged in the concrete surface layer, and two ends are respectively used for feeding and discharging water; the phase change concrete layer is arranged below the concrete surface layer; the second pipeline is arranged in the phase-change concrete layer, and two ends of the second pipeline are respectively used for feeding and discharging water; the temperature monitoring modules are respectively arranged in the concrete surface layer and the phase change concrete layer and are used for monitoring internal temperatures of the concrete surface layer and the phase change concrete layer; when the temperature difference, monitored by the temperature monitoring module, of the phase-change concrete layer and the concrete surface layer is larger than or equal to 15 DEG C, hot water is introduced into the first pipeline to heat the concrete surface layer, and cold water is introduced into the second pipeline to cool the phase-change concrete layer. Hot water is introduced through the first pipeline to heat the surface layer of the concrete, cold water is introduced through the second pipeline to cool the phase change concrete layer, and the temperature of the mass concrete is controlled in combination with the phase change material, so that cracks caused by temperature difference are avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of mass concrete construction, and in particular relates to a mass concrete temperature crack control system based on phase change temperature control. Background Art

[0002] Mass concrete is widely used in municipal administration, bridges, water conservancy and other fields. Due to the large volume of concrete, the heat generated during cement hydration is difficult to dissipate through natural heat dissipation. Due to the temperature difference inside and outside the concrete, mass concrete can easily shrink and produce cracks during the heat dissipation and cooling process, affecting its quality of use.

[0003] The existing solution is to cool the interior by sending water through pipes, but this cooling method is relatively simple and will still cause cracks in actual use, endangering quality, and the control effect is poor. Summary of the invention

[0004] The present invention provides a mass concrete temperature crack control system based on phase change temperature control to solve the above technical problems.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A large-volume concrete temperature crack control system based on phase change temperature control, the system comprises: a concrete surface layer; a first pipe, arranged in the concrete surface layer, with two ends respectively used for water intake and drainage; a phase change concrete layer, arranged below the concrete surface layer; a second pipe, arranged in the phase change concrete layer, with two ends respectively used for water intake and drainage; a temperature monitoring module, respectively arranged in the concrete surface layer and the phase change concrete layer, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer and the concrete surface layer monitored by the temperature monitoring module is ≥15°C, hot water is passed through the first pipe to heat up the concrete surface layer, and cold water is passed through the second pipe to cool down the phase change concrete layer.

[0007] Furthermore, the system also includes: a data transmission module, connected to the temperature monitoring module, and used to transmit the monitored temperature data to the controller.

[0008] Furthermore, the first pipe is arranged in a wave pattern, and the distance between two adjacent wave peaks is -0 cm.

[0009] Furthermore, a plurality of the first pipes are arranged at equal intervals in the width or length direction of the concrete surface.

[0010] Furthermore, the second pipe is arranged in a wave pattern, and the distance between two adjacent wave crests is 0-0 cm.

[0011] Furthermore, a plurality of second pipes are arranged at equal intervals in the width or length direction of the phase change concrete layer; and a projection of the first pipe in the longitudinal direction does not overlap with the second pipe.

[0012] Furthermore, the phase change concrete layer includes the following raw materials in parts by weight: 350-500 parts of cement, 50-100 parts of fly ash, 650-750 parts of river sand, 900-1100 parts of crushed stone, 50-75 parts of phase change material, and an appropriate amount of water; the phase change material includes the following raw materials in parts by weight: paraffin, graphite, melamine formaldehyde resin, ceramsite, and polymethyl methacrylate.

[0013] Furthermore, the weight ratio of paraffin wax, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin and polymethacrylate used in the phase change material is 1:0.3-0.5:0.2-0.4:0.1-0.25:0.2-0.4:0.3-0.5.

[0014] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0015] S1, the temperature of the phase change concrete layer and the concrete surface layer monitored by the temperature monitoring module are transmitted to the controller via the data module to obtain a temperature difference;

[0016] S2. When the temperature difference is ≥15°C, the controller controls the first pipe to pass hot water to heat the concrete surface layer, and controls the second pipe to pass cold water to cool the phase change concrete layer;

[0017] S3. When the temperature difference is less than 15°C, the controller controls the first pipe and the second pipe to stop water intake.

[0018] Furthermore, in step S2, the water inflow rate of the first pipeline is 5-10 L / h, and the water inflow rate of the second pipeline is 3-6 L / h.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] When the temperature difference between the phase change concrete layer and the concrete surface layer monitored by the temperature monitoring module is ≥15°C, hot water is passed through the first pipe to heat the concrete surface layer, and cold water is passed through the second pipe to cool the phase change concrete layer, thereby reducing the temperature difference between the concrete surface layer and the phase change concrete layer, thereby reducing the possibility of cracks caused by temperature differences.

[0021] The phase change material used in the phase change concrete layer can be used to absorb the hydration heat of concrete, store the heat through phase changes, and then slowly release it, so as to avoid a large amount of heat being generated in a short period of time and the heat being not dissipated in time, causing the concrete to crack due to excessive temperature differences, thereby affecting the quality of the concrete; at the same time, the first pipe, the second pipe and the phase change material are used in combination to improve the control effect of the temperature of large-volume concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a schematic diagram of the structure of the present invention.

[0024] Figure 2 This is a connection diagram for this application.

[0025] Figure numerals: 1-concrete surface layer, 2-first pipeline, 3-phase change concrete layer, 4-second pipeline, 5-temperature monitoring module, 6-data transmission module, 7-controller. DETAILED DESCRIPTION

[0026] To facilitate a better understanding of the present invention, the following examples are provided to illustrate the present invention in conjunction with the accompanying drawings. These examples belong to the protection scope of the present invention, but do not limit the protection scope of the present invention.

[0027] Example 1

[0028] Mass concrete temperature crack control system based on phase change temperature control, such as Figure 1-2 As shown, the system includes: a concrete surface layer 1; a first pipe 2, arranged in the concrete surface layer 1, with two ends respectively used for water intake and drainage; a phase change concrete layer 3, arranged below the concrete surface layer 1; a second pipe 4, arranged in the phase change concrete layer 3, with two ends respectively used for water intake and drainage; a temperature monitoring module 5, respectively arranged in the concrete surface layer 1 and the phase change concrete layer 3, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is ≥15°C, hot water is passed into the first pipe 2 to heat up the concrete surface layer 1, and cold water is passed into the second pipe 4 to cool down the phase change concrete layer 3.

[0029] like Figure 1-2 As shown, the system further includes: a data transmission module 6 connected to the temperature monitoring module 4 and used for transmitting the monitored temperature data to the controller 7 .

[0030] like Figure 1-2 As shown, the first pipeline 2 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 35 cm.

[0031] like Figure 1-2 As shown, a plurality of first pipes 2 are arranged at equal intervals in the width or length direction of the concrete surface layer 1 .

[0032] like Figure 1-2 As shown, the second pipe 4 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 10 cm.

[0033] like Figure 1-2 As shown, a plurality of second pipes 4 are arranged at equal intervals in the width or length direction of the phase change concrete layer 3 ; and the projection of the first pipe 2 in the longitudinal direction does not overlap with the second pipe 4 .

[0034] The phase change concrete layer includes the following raw materials in parts by weight: 350 parts of cement, 50 parts of fly ash, 650 parts of river sand, 900 parts of crushed stone, 50 parts of phase change material, and an appropriate amount of water; the phase change material includes the following raw materials in parts by weight: paraffin, graphite, melamine formaldehyde resin, ceramsite, and polymethyl methacrylate.

[0035] The weight ratio of paraffin wax, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin and polymethacrylate used in the phase change material is 1:0.3:0.2:0.1:0.2:0.3.

[0036] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0037] S1, the temperature of the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is transmitted to the controller 7 via the data module 6 to obtain the temperature difference;

[0038] S2. When the temperature difference is ≥15°C, the controller 6 controls the first pipe 2 to pass hot water to heat the concrete surface layer 1, and controls the second pipe 4 to pass cold water to cool the phase change concrete layer 3;

[0039] S3. When the temperature difference is less than 15°C, the controller 6 controls the first pipe 2 and the second pipe 4 to stop water inflow.

[0040] The water inflow of the first pipeline 2 in step S2 is 5 L / h, and the water inflow of the second pipeline 4 is 3 L / h.

[0041] Example 2

[0042] Mass concrete temperature crack control system based on phase change temperature control, such as Figure 1-2As shown, the system includes: a concrete surface layer 1; a first pipe 2, arranged in the concrete surface layer 1, with two ends respectively used for water intake and drainage; a phase change concrete layer 3, arranged below the concrete surface layer 1; a second pipe 4, arranged in the phase change concrete layer 3, with two ends respectively used for water intake and drainage; a temperature monitoring module 5, respectively arranged in the concrete surface layer 1 and the phase change concrete layer 3, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is ≥15°C, hot water is passed into the first pipe 2 to heat up the concrete surface layer 1, and cold water is passed into the second pipe 4 to cool down the phase change concrete layer 3.

[0043] like Figure 1-2 As shown, the system further includes: a data transmission module 6 connected to the temperature monitoring module 4 and used for transmitting the monitored temperature data to the controller 7 .

[0044] like Figure 1-2 As shown, the first pipeline 2 is arranged in a wave row, and the distance between two adjacent wave peaks is 38 cm.

[0045] like Figure 1-2 As shown, a plurality of first pipes 2 are arranged at equal intervals in the width or length direction of the concrete surface layer 1 .

[0046] like Figure 1-2 As shown, the second pipe 4 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 13 cm.

[0047] like Figure 1-2 As shown, a plurality of second pipes 4 are arranged at equal intervals in the width or length direction of the phase change concrete layer 3 ; and the projection of the first pipe 2 in the longitudinal direction does not overlap with the second pipe 4 .

[0048] The phase change concrete layer includes the following raw materials in parts by weight: 400 parts of cement, 70 parts of fly ash, 690 parts of river sand, 1000 parts of crushed stone, 60 parts of phase change material, and an appropriate amount of water; the phase change material includes the following raw materials in parts by weight: paraffin, graphite, melamine formaldehyde resin, ceramsite, and polymethyl methacrylate.

[0049] The weight ratio of paraffin wax, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin and polymethacrylate used in the phase change material is 1:0.4:0.3:0.15:0.3:0.4.

[0050] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0051] S1, the temperature of the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is transmitted to the controller 7 via the data module 6 to obtain the temperature difference;

[0052] S2. When the temperature difference is ≥15°C, the controller 6 controls the first pipe 2 to pass hot water to heat the concrete surface layer 1, and controls the second pipe 4 to pass cold water to cool the phase change concrete layer 3;

[0053] S3. When the temperature difference is less than 15°C, the controller 6 controls the first pipe 2 and the second pipe 4 to stop water inflow.

[0054] The water inflow of the first pipeline 2 in step S2 is 7 L / h, and the water inflow of the second pipeline 4 is 4 L / h.

[0055] Example 3

[0056] Mass concrete temperature crack control system based on phase change temperature control, such as Figure 1-2 As shown, the system includes: a concrete surface layer 1; a first pipe 2, arranged in the concrete surface layer 1, with two ends respectively used for water intake and drainage; a phase change concrete layer 3, arranged below the concrete surface layer 1; a second pipe 4, arranged in the phase change concrete layer 3, with two ends respectively used for water intake and drainage; a temperature monitoring module 5, respectively arranged in the concrete surface layer 1 and the phase change concrete layer 3, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is ≥15°C, hot water is passed into the first pipe 2 to heat up the concrete surface layer 1, and cold water is passed into the second pipe 4 to cool down the phase change concrete layer 3.

[0057] like Figure 1-2 As shown, the system further includes: a data transmission module 6 connected to the temperature monitoring module 4 and used for transmitting the monitored temperature data to the controller 7 .

[0058] like Figure 1-2 As shown, the first pipeline 2 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 40 cm.

[0059] like Figure 1-2 As shown, a plurality of first pipes 2 are arranged at equal intervals in the width or length direction of the concrete surface layer 1 .

[0060] like Figure 1-2 As shown, the second pipe 4 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 15 cm.

[0061] like Figure 1-2 As shown, a plurality of second pipes 4 are arranged at equal intervals in the width or length direction of the phase change concrete layer 3 ; and the projection of the first pipe 2 in the longitudinal direction does not overlap with the second pipe 4 .

[0062] The phase change concrete layer includes the following raw materials in parts by weight: 500 parts of cement, 80 parts of fly ash, 700 parts of river sand, 1000 parts of crushed stone, 65 parts of phase change material, and an appropriate amount of water; the weight ratio of paraffin, graphite, ceramsite, toluene 2,4 diisocyanate, melamine formaldehyde resin, and polymethacrylate used in the phase change material is 1:0.4:0.3:0.25:0.4:0.3.

[0063] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0064] S1, the temperature of the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is transmitted to the controller 7 via the data module 6 to obtain the temperature difference;

[0065] S2. When the temperature difference is ≥15°C, the controller 6 controls the first pipe 2 to pass hot water to heat the concrete surface layer 1, and controls the second pipe 4 to pass cold water to cool the phase change concrete layer 3;

[0066] S3. When the temperature difference is less than 15°C, the controller 6 controls the first pipe 2 and the second pipe 4 to stop water inflow.

[0067] The water inflow of the first pipeline 2 in step S2 is 7 L / h, and the water inflow of the second pipeline 4 is 5 L / h.

[0068] Example 4

[0069] Mass concrete temperature crack control system based on phase change temperature control, such as Figure 1-2 As shown, the system includes: a concrete surface layer 1; a first pipe 2, arranged in the concrete surface layer 1, with two ends respectively used for water intake and drainage; a phase change concrete layer 3, arranged below the concrete surface layer 1; a second pipe 4, arranged in the phase change concrete layer 3, with two ends respectively used for water intake and drainage; a temperature monitoring module 5, respectively arranged in the concrete surface layer 1 and the phase change concrete layer 3, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is ≥15°C, hot water is passed into the first pipe 2 to heat up the concrete surface layer 1, and cold water is passed into the second pipe 4 to cool down the phase change concrete layer 3.

[0070] like Figure 1-2 As shown, the system further includes: a data transmission module 6 connected to the temperature monitoring module 4 and used for transmitting the monitored temperature data to the controller 7 .

[0071] like Figure 1-2 As shown, the first pipeline 2 is arranged in a wave row, and the distance between two adjacent wave peaks is 38 cm.

[0072] like Figure 1-2As shown, a plurality of first pipes 2 are arranged at equal intervals in the width or length direction of the concrete surface layer 1 .

[0073] like Figure 1-2 As shown, the second pipe 4 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 18 cm.

[0074] like Figure 1-2 As shown, a plurality of second pipes 4 are arranged at equal intervals in the width or length direction of the phase change concrete layer 3 ; and the projection of the first pipe 2 in the longitudinal direction does not overlap with the second pipe 4 .

[0075] The phase change concrete layer includes the following raw materials in parts by weight: 460 parts of cement, 90 parts of fly ash, 730 parts of river sand, 1050 parts of crushed stone, 68 parts of phase change material, and an appropriate amount of water; the weight ratio of paraffin, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin, and polymethacrylate used in the phase change material is 1:0.3:0.2:0.2:0.3:0.3.

[0076] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0077] S1, the temperature of the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is transmitted to the controller 7 via the data module 6 to obtain the temperature difference;

[0078] S2. When the temperature difference is ≥15°C, the controller 6 controls the first pipe 2 to pass hot water to heat the concrete surface layer 1, and controls the second pipe 4 to pass cold water to cool the phase change concrete layer 3;

[0079] S3. When the temperature difference is less than 15°C, the controller 6 controls the first pipe 2 and the second pipe 4 to stop water inflow.

[0080] The water inflow of the first pipeline 2 in step S2 is 8 L / h, and the water inflow of the second pipeline 4 is 5 L / h.

[0081] Example 5

[0082] Mass concrete temperature crack control system based on phase change temperature control, such as Figure 1-2As shown, the system includes: a concrete surface layer 1; a first pipe 2, arranged in the concrete surface layer 1, with two ends respectively used for water intake and drainage; a phase change concrete layer 3, arranged below the concrete surface layer 1; a second pipe 4, arranged in the phase change concrete layer 3, with two ends respectively used for water intake and drainage; a temperature monitoring module 5, respectively arranged in the concrete surface layer 1 and the phase change concrete layer 3, for monitoring the internal temperature of both; when the temperature difference between the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is ≥15°C, hot water is passed into the first pipe 2 to heat up the concrete surface layer 1, and cold water is passed into the second pipe 4 to cool down the phase change concrete layer 3.

[0083] like Figure 1-2 As shown, the system further includes: a data transmission module 6 connected to the temperature monitoring module 4 and used for transmitting the monitored temperature data to the controller 7 .

[0084] like Figure 1-2 As shown, the first pipeline 2 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 40 cm.

[0085] like Figure 1-2 As shown, a plurality of first pipes 2 are arranged at equal intervals in the width or length direction of the concrete surface layer 1 .

[0086] like Figure 1-2 As shown, the second pipe 4 is arranged in a wave pattern, and the distance between two adjacent wave peaks is 20 cm.

[0087] like Figure 1-2 As shown, a plurality of second pipes 4 are arranged at equal intervals in the width or length direction of the phase change concrete layer 3 ; and the projection of the first pipe 2 in the longitudinal direction does not overlap with the second pipe 4 .

[0088] The phase change concrete layer includes the following raw materials in parts by weight: 500 parts of cement, 100 parts of fly ash, 750 parts of river sand, 1,100 parts of crushed stone, 75 parts of phase change material, and an appropriate amount of water; the phase change material includes the following raw materials in parts by weight: paraffin, graphite, melamine formaldehyde resin, ceramsite, and polymethyl methacrylate.

[0089] The weight ratio of paraffin wax, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin and polymethacrylate used in the phase change material is 1:0.5:0.4:0.25:0.4:0.5.

[0090] The present application also provides a method for controlling temperature cracks in mass concrete based on phase change temperature control, comprising the following steps:

[0091] S1, the temperature of the phase change concrete layer 3 and the concrete surface layer 1 monitored by the temperature monitoring module 5 is transmitted to the controller 7 via the data module 6 to obtain the temperature difference;

[0092] S2. When the temperature difference is ≥15°C, the controller 6 controls the first pipe 2 to pass hot water to heat the concrete surface layer 1, and controls the second pipe 4 to pass cold water to cool the phase change concrete layer 3;

[0093] S3. When the temperature difference is less than 15°C, the controller 6 controls the first pipe 2 and the second pipe 4 to stop water inflow.

[0094] The water inflow of the first pipeline 2 in step S2 is 10 L / h, and the water inflow of the second pipeline 4 is 6 L / h.

[0095] In the above embodiment, solenoid valves may be provided on the first pipe and the second pipe and connected to the controller so that the water inflow of the first pipe and the second pipe can be controlled by the controller to improve the convenience of operation.

[0096] The temperature monitoring module used is used to monitor the temperature and is an existing product. Existing products such as temperature sensors can be used; the data transmission module is an existing product and can be connected to the temperature detection module and the controller by wire or wireless to acquire and transmit temperature data; the controller is an existing product; the above-mentioned temperature monitoring module, data transmission module, and controller are all existing products, and the specific models are not improvements, so they will not be elaborated again.

[0097] In addition, a temperature monitoring module can be set up to monitor the temperature of the external environment, and at the same time, the temperature of the concrete surface and the external environment can be kept less than 15°C to avoid excessive temperature difference. If the temperature difference is greater than 15°C, hot water or cold water can be introduced into the first pipe according to actual conditions to adjust the temperature of the concrete layer, thereby reducing the temperature difference.

[0098] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the statement "including an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0099] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A mass concrete temperature crack control system based on phase change temperature control, characterized in that: The system includes: Concrete surface (1); A first pipe (2) is arranged in the concrete surface layer (1), with two ends thereof respectively used for water intake and water discharge; A phase change concrete layer (3) is arranged below the concrete surface layer (1); A second pipe (4) is arranged in the phase change concrete layer (3), with two ends thereof respectively used for water intake and water discharge; A temperature monitoring module (5) is respectively arranged in the concrete surface layer (1) and the phase change concrete layer (3) to monitor the temperature inside the two layers; When the temperature difference between the phase change concrete layer (3) and the concrete surface layer (1) monitored by the temperature monitoring module (5) is ≥15°C, hot water is passed through the first pipe (2) to increase the temperature of the concrete surface layer (1), and cold water is passed through the second pipe (4) to reduce the temperature of the phase change concrete layer (3).

2. The mass concrete temperature crack control system based on phase change temperature control according to claim 1 is characterized in that: Also includes: The data transmission module (6) is connected to the temperature monitoring module (4) and is used to transmit the monitored temperature data to the controller (7).

3. The mass concrete temperature crack control system based on phase change temperature control according to claim 2 is characterized in that: The first pipe (2) is arranged in a wave pattern, and the distance between two adjacent wave crests is 35-40 cm.

4. The mass concrete temperature crack control system based on phase change temperature control according to claim 3 is characterized in that: A plurality of the first pipes (2) are arranged at equal intervals in the width or length direction of the concrete surface layer (1).

5. The mass concrete temperature crack control system based on phase change temperature control according to claim 4 is characterized in that: The second pipe (4) is arranged in a wave pattern, and the distance between two adjacent wave peaks is 10-20 cm.

6. The mass concrete temperature crack control system based on phase change temperature control according to claim 5 is characterized in that: A plurality of second pipes (4) are arranged at equal intervals in the width or length direction of the phase change concrete layer (3); and the projection of the first pipe (2) in the longitudinal direction does not overlap with the second pipe (4).

7. The mass concrete temperature crack control system based on phase change temperature control according to claim 6 is characterized in that: The phase change concrete layer (3) comprises the following raw materials in parts by weight: 350-500 parts of cement, 50-100 parts of fly ash, 650-750 parts of river sand, 900-1100 parts of crushed stone, 50-75 parts of phase change material, and appropriate amount of water; The phase change material comprises the following raw materials in parts by weight: paraffin, graphite, melamine formaldehyde resin, ceramsite, and polymethyl methacrylate.

8. The mass concrete temperature crack control system based on phase change temperature control according to claim 7 is characterized in that: The weight ratio of paraffin wax, graphite, ceramsite, toluene 2,4-diisocyanate, melamine formaldehyde resin and polymethacrylate used in the phase change material is 1:0.3-0.5:0.2-0.4:0.1-0.25:0.2-0.4:0.3-0.

5.

9. The method for controlling temperature cracks of mass concrete based on phase change temperature control according to any one of claims 2 to 8, characterized in that: The following steps are involved: S1, the temperatures of the phase change concrete layer (3) and the concrete surface layer (1) monitored by the temperature monitoring module (5) are transmitted to the controller (7) via the data module (6) to obtain a temperature difference; S2. When the temperature difference is ≥15° C., the controller (6) controls the first pipe (2) to pass hot water to raise the temperature of the concrete surface layer (1), and controls the second pipe (4) to pass cold water to lower the temperature of the phase change concrete layer (3); S3. When the temperature difference is less than 15° C., the controller (6) controls the first pipe (2) and the second pipe (4) to stop water inflow.

10. The method for controlling temperature cracks of mass concrete based on phase change temperature control according to claim 9, characterized in that: The water inflow rate of the first pipeline (2) in step S2 is 5-10 L / h, and the water inflow rate of the second pipeline (4) is 3-6 L / h.

Images