Reduced scale test structure and method for temperature control of mass concrete in construction and maintenance period

Abstract

The invention relates to the technical field of constructional engineering, and discloses a reduced scale test structure and method for temperature control of mass concrete in the construction and maintenance period. A mass bottom layer concrete reduced scale structure is arranged, and a reduced scale concrete thin-wall structure is placed on the upper surface of the mass bottom layer concrete after the maintenance period of the mass bottom layer concrete is finished; and the temperature distribution of the thin-wall structure in the construction period is regulated and controlled through a temperature control system in the bottom layer concrete. According to the invention, a scale test structure of a large-volume bottom concrete-upper concrete thin-wall structure is built, and the temperature change in the upper concrete thin-wall structure in the building and maintenance period is dynamically adjusted through a temperature control system in the test structure; the temperature, stress change and crack derivative characteristics in the structure can be explored according to multiple scale tests, and a theoretical basis is provided for temperature control and crack prevention of mass concrete in the construction and maintenance period.

Description

Technical Field

[0001] The present invention belongs to the field of construction engineering technology, in particular to a method for studying the internal temperature deformation of a large-volume concrete structure, and more particularly to a scaled test structure and method for temperature control of large-volume concrete during the curing period. Background Art

[0002] In the construction practice of large-volume concrete projects (such as hydraulic structures, bridge foundations, and raft slabs of super-high-rise buildings), temperature control during the concrete curing period is directly related to the structure's crack resistance and service life. Due to the temperature gradient effect caused by the release of heat from hydration in concrete, temperature stresses exceeding the material's tensile strength can easily form within the structure, leading to the formation of through-hole cracks. According to industry statistics, approximately 65% of large-volume concrete cracking incidents are caused by improper temperature control measures during the curing period. These structures often have a typical "massive concrete bottom layer and thin-walled upper layer" system. The temperature field coupling effect caused by the layered pouring makes crack prevention and control more difficult. In traditional engineering practice, solutions to such problems mainly rely on the following two technical paths: First, extensive temperature control based on empirical formulas, which performs passive temperature regulation by pre-embedding cooling water pipes inside the concrete and covering the surface with insulation materials. However, this method is difficult to accurately match the differentiated temperature control requirements of layered structures, especially for the upper thin-walled structure affected by the temperature lag of the underlying concrete. There is a blind spot in the regulation; second, finite element numerical simulation is used to predict the temperature field. However, the discreteness of concrete material parameters and the complexity of boundary conditions in actual engineering lead to a generally large deviation between the simulation results and the measured data.

[0003] In response to the above-mentioned problems, the present invention aims to propose a scaled test structure and method for temperature control of large-volume concrete during the construction and curing period. By setting up a scaled structure of large-volume bottom concrete, a scaled concrete thin-walled structure is placed on the upper surface of the large-volume bottom concrete after the curing period, and the temperature distribution of the thin-walled structure during the construction and curing period is regulated by a temperature control system inside the bottom concrete. The present invention constructs a scaled test structure of a large-volume bottom concrete-upper concrete thin-walled structure, and dynamically adjusts the temperature changes within the upper concrete thin-walled structure during the construction and curing period through the temperature control system inside the test structure. Based on multiple scaled tests, the present invention can explore the temperature, stress changes and crack derivative characteristics within the structure, providing a theoretical basis for temperature control and crack prevention of large-volume concrete during the construction and curing period.

[0004] After review, the published patents related to large-volume structure scale test structures and methods are as follows:

[0005] CN119043628A discloses a scaled test structure and method for the mechanical response of a flexible composite cushion shed cavern under the impact of dangerous rocks, wherein each technical point does not involve temperature control; Summary of the Invention

[0006] Based on the problem that the existing method mentioned above cannot effectively analyze the temperature field coupling effect caused by layered pouring, a scaled test structure and method for temperature control of large-volume concrete during the construction and curing period are provided, which provides a theoretical basis for temperature control and crack prevention of large-volume concrete during the construction and curing period.

[0007] The present invention provides a scaled test structure for temperature control of large-volume concrete during the construction and curing period, which is characterized by comprising a scaled model of large-volume concrete at the bottom layer and a scaled model of concrete at the upper layer;

[0008] Furthermore, the bottom layer large-volume concrete scale model is cast on the ground, and the upper layer concrete scale model is cast on the upper surface of the bottom layer large-volume concrete scale model.

[0009] Furthermore, the bottom mass concrete scale model includes a thermal insulation coating, an internal bottom layer sensor, an internal middle layer sensor, and an internal upper layer sensor;

[0010] Preferably, the thermal insulation coating can be made of polyurethane thermal insulation paint, but can also be other paints that are easy to apply, quickly form effects, and have good thermal insulation properties.

[0011] Preferably, the selected sensor can be a combination of a temperature sensor and a stress sensor, or a sensor capable of monitoring both temperature and stress parameters.

[0012] Preferably, the thermal insulation coating is applied to the root of the bottom mass concrete scale model to prevent the root of the bottom mass concrete scale model from losing temperature and cracking, but it can also be applied all over according to the actual local temperature.

[0013] Furthermore, internal bottom layer sensors, internal middle layer sensors and internal upper layer sensors are buried inside the bottom layer large-volume concrete scale model. Each layer of sensors is evenly distributed in the horizontal direction to monitor the stress and temperature changes inside the bottom layer large-volume concrete scale model.

[0014] Preferably, for a large-volume concrete scale model with a thicker bottom layer, multiple layers of sensors may be arranged.

[0015] Furthermore, a left heating water pipe, a middle heating water pipe and a right heating water pipe are buried at the top of the bottom large-volume concrete scale model to provide temperature compensation for the bottom large-volume concrete scale model and the upper concrete scale model.

[0016] Preferably, when the temperature is high, the left heating water pipe, the middle heating water pipe and the right heating water pipe can be connected in series, but when the temperature is extremely low, three heat sources are required to heat the structure with the highest efficiency.

[0017] Furthermore, a first steam water pipe is provided at the root of the left side of the bottom large-volume concrete scale model, and a second steam water pipe is provided at the top of the left side of the bottom large-volume concrete scale model, for heating the left surface of the bottom large-volume concrete scale model.

[0018] Preferably, when the temperature is extremely low, multiple rows of steam water pipes can be provided to heat the left surface of the bottom large-volume concrete scale model.

[0019] Furthermore, a first thermal insulation film is wrapped around the outside of the first steam water pipe and the second steam water pipe to ensure that the left surface of the bottom large-volume concrete scale model does not lose temperature.

[0020] Preferably, the gas outlets of the first steam water pipe and the second steam water pipe are arranged to face each other, so that the steam fully covers the surface on the left side of the bottom large-volume concrete scale model.

[0021] Preferably, the first thermal insulation film can also be used in combination with felt.

[0022] Furthermore, an upper left sensor is pasted on the left side of the upper surface of the bottom large-volume concrete scale model, and an upper right sensor is pasted on the right side of the upper surface of the bottom large-volume concrete scale model, which are used to monitor the temperature and stress changes on the upper surface of the bottom large-volume concrete scale model.

[0023] Preferably, the upper left sensor and the upper right sensor should collect data synchronously and be compared in real time during the monitoring process.

[0024] Furthermore, the top of the first thermal insulation film is pressed by the first fixing device to prevent heat leakage from inside the first thermal insulation film.

[0025] Furthermore, the first fixing device is connected to a displacement meter for monitoring the relative displacement between the left bottom of the upper concrete scale model and the upper surface of the bottom large-volume concrete scale model.

[0026] Furthermore, the left surface, interior and right surface of the upper concrete scale model are respectively affixed with an upper concrete left facade sensor, an upper concrete interior sensor and an upper concrete right facade sensor, which are used to monitor the temperature and stress changes on the left surface, interior and right surface of the upper concrete scale model.

[0027] Furthermore, a third steam water pipe and a fourth steam water pipe are respectively provided on the left top and the right top of the upper concrete scale model, for heating all outer surfaces of the upper concrete scale model.

[0028] Furthermore, the outer surface of the upper concrete scale model is covered with a second thermal insulation film for maintaining the temperature of all outer surfaces of the upper concrete scale model.

[0029] Furthermore, the right side of the second thermal insulation film is covered on the support rod and fixed to the top of the upper concrete scale model through a second fixing device.

[0030] Furthermore, a camera is provided inside the second thermal insulation film for real-time transmission and analysis of stress changes and crack propagation on the right side surface of the upper concrete scale model.

[0031] Preferably, the camera's captured content can be analyzed using DIC, or machine learning technology can be used to quickly identify cracks.

[0032] A scaled test method for temperature control of large-volume concrete during the curing period, characterized by comprising the following steps:

[0033] S1: Prepare the scaled test site, construct the large-volume concrete scaled model of the ground floor and install the temperature control system;

[0034] S2: Preparation and pouring of upper concrete scale model;

[0035] S3: Joint temperature control system commissioning and monitoring system integration;

[0036] S4: Combined maintenance and testing.

[0037] In step S1, the ground in the construction area should be cleaned and a temporary water supply and power supply system should be set up; then, steel formwork should be used to support the formwork, and concrete should be poured in layers. The internal bottom layer sensor, internal middle layer sensor, internal upper layer sensor, left heating water pipe, middle heating water pipe and right heating water pipe should be buried simultaneously; then, the first steam water pipe and the second steam water pipe should be installed, and the bottom large-volume concrete scale model should be covered with a first insulation film, and polyurethane insulation coating should be applied at its base;

[0038] In step S2, the surface of the bottom large-volume concrete scale model is roughened, and the upper left and upper right sensors are attached. Then, the steel formwork and adjustable supports are installed, and concrete is poured in layers. During the pouring process, the sensors are embedded in the upper concrete and maintained.

[0039] In step S3, the upper concrete left facade sensor and the upper concrete right facade sensor are attached, and then the displacement meter, the third steam water pipe, the fourth steam water pipe and the support rod are installed. The upper concrete scale model is fully wrapped with a second thermal insulation film, and then a camera is set.

[0040] Preferably, the step 2 further comprises: the hot water pipe starts to heat up on the 5th day after the concrete is poured, the water inlet temperature is initially maintained at around 50°C, and is then adjusted to 60°C after one day.

[0041] Preferably, step 4 further comprises: during the curing stage of the upper concrete scale model, heating the bottom large-volume concrete scale model through a hot water pipe so that the temperatures of the upper concrete scale model and the bottom large-volume concrete scale model are kept consistent.

[0042] Compared with the prior art, the advantages and positive effects of the present invention are:

[0043] 1. The present invention can effectively simulate the temperature field coupling effect during the actual layered pouring of large-volume concrete through the layered structural design of the bottom-layer large-volume concrete scale model and the upper-layer concrete scale model, and provide a scientific and reasonable experimental model for studying the temperature control and crack prevention of large-volume concrete during the construction and curing period. By setting a thermal insulation coating, internal multi-layer sensors, heating water pipes, steam water pipes and other temperature control and monitoring devices in the bottom-layer large-volume concrete scale model, the temperature and stress changes inside and on the surface of the bottom-layer concrete can be monitored in all directions, and precise temperature supplementation can be performed through heating water pipes and steam water pipes to effectively prevent the bottom-layer concrete from losing temperature and cracking. Multiple sensors, steam water pipes, thermal insulation films, cameras and other devices are set in the upper-layer concrete scale model to monitor the temperature, stress changes and crack extension of the upper-layer concrete in real time. At the same time, the upper-layer concrete is insulated and heated through the thermal insulation film and steam water pipe to ensure its temperature stability.

[0044] 2. By evenly distributing multiple layers of sensors within the bottom-level, large-scale concrete model and installing sensors on the surface, interior, and sides of the upper-level scaled concrete model, comprehensive, multi-level monitoring of temperature and stress changes within and on the surface of the concrete can be achieved, obtaining more accurate test data. A displacement meter installed between the bottom-level, large-scale concrete model and the upper-level scaled concrete model can monitor the relative displacement between the two in real time, providing important data support for analyzing the impact of layered pouring on the concrete structure. A camera is used to transmit and analyze stress changes and crack propagation on the right side of the upper-level scaled concrete model in real time. DIC or machine learning techniques can be combined to quickly identify cracks, improving the accuracy and efficiency of crack monitoring.

[0045] 3. The scaled test structure and method of the present invention can effectively simulate the temperature changes and stress distribution of large-volume concrete during the construction and curing period, providing a scientific and reasonable theoretical basis for the temperature control and crack prevention design and construction of large-volume concrete in actual projects, helping to optimize construction plans, reduce the occurrence of cracks, and improve the quality and durability of concrete structures; through the test method of the present invention, the influence of different temperature control measures on the temperature field and stress field of large-volume concrete can be studied, providing a reference for selecting appropriate temperature control measures in actual projects, reducing project costs, and improving construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0047] Figure 1 A schematic diagram of a scaled test structure for temperature control of large-volume concrete during the curing period provided in Example 1;

[0048] Figure 2 A time-varying diagram of the internal strain of a scaled model structure of a bottom-level mass concrete structure provided in Example 1;

[0049] Figure 3 A time-varying diagram of the internal temperature of an upper concrete scale model structure provided in Example 1;

[0050] Figure 4 A surface strain cloud map of the upper concrete scale model structure obtained by post-processing the camera shot provided in Example 1;

[0051] In the above figures, 1. Scaled model of the bottom layer of large-volume concrete; 2. Scaled model of the upper layer of concrete; 11. Thermal insulation coating; 12. Internal bottom layer sensor; 13. Internal middle layer sensor; 14. Internal upper layer sensor; 15. Left heating water pipe; 16. Middle heating water pipe; 17. Right heating water pipe; 18. First steam water pipe; 19. Second steam water pipe; 110. First thermal insulation film; 111. Upper left sensor; 112. Upper right sensor; 113. First fixing device; 114. Displacement meter; 21. Upper concrete left facade sensor; 22. Upper concrete internal sensor; 23. Upper concrete right facade sensor; 24. Third steam water pipe; 25. Fourth steam water pipe; 26. Second thermal insulation film; 27. Right side cover on the support rod; 28. Second fixing device; 29. Camera. DETAILED DESCRIPTION

[0052] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other in the absence of conflict.

[0053] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0054] Example 1: This example aims to implement a scaled test structure for temperature control of large-volume concrete during the curing period. Figure 1 When setting up the scale test structure, you need to follow the following steps to ensure the correctness of the scale test:

[0055] 1. First, clean the ground in the construction area to ensure that the flatness error is ≤3mm; then prepare the displacement meter and its base with an accuracy of ±0.1mm; then pre-embed the bottom sensor wire pipe, using PVC pipe with an inner diameter of Φ20mm; and set up a temporary water and power supply system with a voltage of 380V / 50Hz and a water pressure of 0.4MPa.

[0056] 2. Carry out the construction of the bottom-level large-volume concrete scale model (1), using steel formwork (thickness ≥ 5mm) as the formwork, and apply a release agent on its inner wall; then pour C40 concrete in layers, each layer is 300mm thick, and vibrate to compact it; synchronously bury the internal bottom-level sensor (12), the internal middle-level sensor (13), the internal upper-level sensor (14), the left-side heating water pipe (15), the middle-level heating water pipe (16) and the right-side heating water pipe (17); among them, the bottom-level sensor (12) is 50mm away from the bottom surface and the spacing is 400mm, the middle-level sensor (13) is 300mm away from the bottom surface and the spacing is 500mm, and the upper-level sensor (14) is 50mm away from the top surface and the spacing is 400mm; the left-side heating water pipe (15), the middle-level heating water pipe (16) and the right-side heating water pipe (17) are 800mm apart, and are externally connected to a Φ25mm galvanized steel pipe. The pipeline is pressure tested at 0.6MPa and maintained for 30min without leakage.

[0057] 3. Install the first steam water pipe (18) and the second steam water pipe (19), the first steam water pipe (18) is 100mm away from the bottom surface and the spacing is 200mm, the second steam water pipe (19) is 50mm away from the top surface and the spacing is 300mm, and a Φ15mm stainless steel corrugated pipe is used with a slope of ≥5‰; cover the bottom large-volume concrete scale model (1) with a first thermal insulation film (110), wrap the left side with two layers of composite thermal insulation film, so that its thermal conductivity is ≤0.03W / m·K, and fix it with stainless steel strips with a spacing of ≤300mm; apply polyurethane thermal insulation paint at the root of the bottom large-volume concrete scale model (1), with a thickness of 3mm±0.5mm, and the coverage range reaches 500mm area from the root of the model; during the maintenance stage, the hot water pipe starts to heat up on the 5th day after the concrete is poured, and the water inlet temperature is maintained at around 50℃ at the beginning, and is adjusted to 60℃ after one day.

[0058] 4. The surface of the bottom-level large-volume concrete scale model (1) is roughened to control the unevenness to be ≥3mm, and the upper left sensor (111) and the upper right sensor (112) are affixed; then the steel formwork and adjustable support are installed, and sensor wire holes are reserved; C50 self-compacting concrete is poured in layers, and the sensor (22) is embedded in the upper concrete during the pouring process, and then maintained.

[0059] 5. Paste the upper concrete left facade sensor (21) and the upper concrete right facade sensor (23), then install the displacement meter (114), the third steam water pipe (24), the fourth steam water pipe (25) and the support rod (27), and use the second insulation film (26) to fully wrap the upper concrete scale model (2); then, adjust the heating system, set the water pipe circulating water temperature to 40±1℃, the steam system pressure to 0.2MPa, and the temperature to 80±5℃; during the curing stage of the upper concrete scale model, heat the bottom large-volume concrete scale model through the hot water pipe to keep the temperature of the upper concrete scale model and the bottom large-volume concrete scale model consistent.

[0060] 6. Configure the data acquisition system, set the sampling frequency ≥ 1 Hz, the accuracy 0.1% FS, set the temperature measurement range -20 to 150 ° C, and the resolution 0.1 ° C; install the image monitoring system, the camera (29) resolution ≥ 2 million pixels, the crack recognition accuracy 0.1 mm, and the frame rate 30 fps.

[0061] Example 2: This example is intended to demonstrate an example of using the technology involved in the present invention in a high-rise building box raft foundation and upper shear wall. When performing this application, the following steps need to be followed to ensure the effectiveness of the application:

[0062] 1. Construction of a scaled box raft foundation model: The scaled foundation dimensions are 2.5m × 1.8m × 0.525m (length × width × height). C45 shrinkage-compensating concrete is used, and a Φ6mm galvanized steel mesh (50×50mm mesh) is embedded to simulate a reinforcement ratio of 2.1%. The bottom layer of the temperature sensor is 60mm from the bottom surface to accommodate the thickening characteristics of the foundation. The vertical spacing is 350mm, and five layers of monitoring points are set up, with the horizontal spacing extended to 600mm. In addition, 45° inclined strain gauge groups are added at the four corners of the foundation to monitor stress concentration in the corners. The spacing between the heating water pipes is increased to 600mm, and Φ20mm copper pipes are used to improve thermal conductivity. The steam system pressure is increased to 0.25MPa to compensate for heat loss due to the increased volume of the box foundation.

[0063] 2. The scaled shear wall model measures 0.8m (height) × 0.3m (width) × 0.05m (thickness) and is designed based on a stiffness similarity ratio. C60 self-compacting, slightly expansive concrete with a water-cement ratio of 0.28 is used as concrete. Pre-embedded shear keys (3mm deep grooves) are installed to simulate the interfacial bite of the actual structure. The density of facade sensors is doubled, with vertical spacing of 150mm and horizontal spacing of 200mm. A diagonal cross-measurement group is added to capture signals of diagonal crack initiation in the shear wall. The lower foundation temperature is maintained at 32±1°C to simulate geothermal effects. The shear wall surface is gradient-controlled to 40°C at the bottom and 35°C at the top to simulate solar temperature differences.

Claims

1. A scaled test structure for temperature control of large-volume concrete during the curing period, characterized in that: It includes a large-volume concrete scale model of the bottom layer (1) and a scale model of the upper layer concrete (2); The bottom layer large-volume concrete scale model (1) is cast on the ground, and the upper layer concrete scale model (2) is cast on the upper surface of the bottom layer large-volume concrete scale model (1); the bottom layer large-volume concrete scale model (1) comprises a thermal insulation coating (11), an internal bottom layer sensor (12), an internal middle layer sensor (13) and an internal upper layer sensor (14); the thermal insulation coating (11) is applied to the root of the bottom layer large-volume concrete scale model (1) to prevent the root of the bottom layer large-volume concrete scale model (1) from losing temperature and cracking, and the internal bottom layer sensor (12), The internal middle layer sensor (13) and the internal upper layer sensor (14) are buried inside the bottom layer large-volume concrete scale model (1), and each layer of sensors is evenly distributed in the horizontal direction, and is used to monitor the stress and temperature changes inside the bottom layer large-volume concrete scale model (1); a left heating water pipe (15), a middle heating water pipe (16) and a right heating water pipe (17) are buried at the top of the bottom layer large-volume concrete scale model (1) to supplement the temperature of the bottom layer large-volume concrete scale model (1) and the upper layer concrete scale model (2); A first steam water pipe (18) is provided at the root of the left side of the soil scale model (1), and a second steam water pipe (19) is provided at the top of the left side of the bottom large-volume concrete scale model (1) for heating the left side surface of the bottom large-volume concrete scale model (1); a first thermal insulation film (110) is wrapped around the outside of the first steam water pipe (18) and the second steam water pipe (19) for ensuring that the left side surface of the bottom large-volume concrete scale model (1) does not lose temperature; an upper left sensor (110) is attached to the left side of the upper surface of the bottom large-volume concrete scale model (1) 1), an upper right sensor (112) is attached to the right side of the upper surface of the bottom large-volume concrete scale model (1), for monitoring the temperature and stress changes of the upper surface of the bottom large-volume concrete scale model (1); the top of the first thermal insulation film (110) is pressed by a first fixing device (113) to prevent heat leakage inside the first thermal insulation film (110); the first fixing device (113) is connected to a displacement meter (114), for monitoring the relative displacement between the left bottom of the upper concrete scale model (2) and the upper surface of the bottom large-volume concrete scale model (1); The upper concrete scale model (2) is respectively attached with an upper concrete left vertical surface sensor (21), an upper concrete internal sensor (22) and an upper concrete right vertical surface sensor (23) on the left side surface, the interior and the right side surface, for monitoring the temperature and stress changes of the upper concrete scale model (2) on the left side surface, the interior and the right side surface; the upper concrete scale model (2) is respectively provided with a third steam water pipe (24) and a fourth steam water pipe (25) on the left top and the right top, for supplying the upper concrete scale model (2) with steam. All outer surfaces of the upper concrete scale model (2) are heated; the outer surface of the upper concrete scale model (2) is covered with a second thermal insulation film (26) for maintaining the temperature of all outer surfaces of the upper concrete scale model (2); the right side of the second thermal insulation film (26) is covered on a support rod (27) and is fixed to the top of the upper concrete scale model (2) through a second fixing device (28); a camera (29) is provided inside the second thermal insulation film (26) for real-time transmission and analysis of stress changes and crack propagation on the right side surface of the upper concrete scale model (2).

2. A scaled test structure for temperature control of large-volume concrete during the curing period according to claim 1, characterized in that: The gas outlets of the first steam water pipe (18) and the second steam water pipe (19) are arranged facing each other, so that the steam fully covers the surface on the left side of the bottom large-volume concrete scale model (1).

3. A scaled test method for temperature control of large volume concrete during the curing period, characterized in that: The following steps are involved: S1: Prepare the scaled test site, construct the large-volume concrete scaled model (1) of the bottom floor and install the temperature control system; S2: Preparation and pouring of the upper concrete scale model (2); S3: Joint temperature control system commissioning and monitoring system integration; S4: Combined maintenance and testing. In step S1, the ground of the construction area should be cleaned and a temporary water supply and power supply system should be set up; then, a steel formwork should be used to support the formwork, and concrete should be poured in layers, and the internal bottom layer sensor (12), the internal middle layer sensor (13), the internal upper layer sensor (14), the left heating water pipe (15), the middle heating water pipe (16) and the right heating water pipe (17) should be buried simultaneously; then, the first steam water pipe (18) and the second steam water pipe (19) should be installed, and the bottom large-volume concrete scale model (1) should be covered with a first insulation film (110), and polyurethane insulation coating should be applied at its root; In step S2, the surface of the bottom mass concrete scale model (1) is roughened, and the upper left sensor (111) and the upper right sensor (112) are attached; then the steel formwork and adjustable support are installed, and concrete is poured in layers. During the pouring process, the sensor (22) is embedded in the upper concrete and maintained; In step S3, the upper concrete left facade sensor (21) and the upper concrete right facade sensor (23) are attached, and then the displacement meter (114), the third steam water pipe (24), the fourth steam water pipe (25) and the support rod (27) are installed. The upper concrete scale model (2) is fully wrapped with a second thermal insulation film (26), and then a camera (29) is installed.

4. A scaled test method for temperature control of large volume concrete during the curing period according to claim 3, characterized in that: The step 2 further includes: the hot water pipe starts to heat up on the 5th day after the concrete is poured, and the water inlet temperature is initially maintained at around 50° C., and then adjusted to 60° C. after one day.

5. A scaled test method for temperature control of large volume concrete during the curing period according to claim 3, characterized in that: The step 4 further comprises: during the curing stage of the upper concrete scale model (2), heating the bottom large-volume concrete scale model (1) through a hot water pipe, so that the temperatures of the upper concrete scale model (2) and the bottom large-volume concrete scale model (1) are kept consistent.

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