Method for controlling hydration reaction rate of magnesium oxysulfate concrete for hollow interlayer composite electric pole
By selecting suitable lightly calcined magnesium oxide raw materials and a temperature control module, the solution temperature was adjusted, solving the problem of unstable hydration reaction rate in magnesium oxide concrete. This enabled full-process control of the hydration reaction, ensuring the workability and strength of the concrete.
Patent Information
- Application Number
- CN202411442298.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-16
- Publication Date
- 2025-01-10
AI Technical Summary
The hydration rate of magnesium oxysulfate concrete is greatly affected by ambient temperature, making it difficult to control during construction. This can easily lead to problems such as the hydration reaction being too fast or too slow, resulting in concrete cracking or reduced strength.
By selecting lightly calcined magnesium oxide raw materials with different loss on ignition, adjusting the solution temperature, and installing a temperature control module on the outer surface of the steel pipe, combined with ambient temperature and concrete reactivity, the entire process of hydration reaction rate can be controlled.
Effectively regulate the hydration reaction rate of concrete to avoid cracking and strength reduction, improve the applicability to the construction environment, and ensure the fluidity and early strength of concrete.
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Figure CN119285325A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of concrete hydration reaction rate control, and in particular to a method for controlling the hydration reaction rate of magnesium oxysulfate concrete for hollow sandwich composite electric poles. Background Art
[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.
[0003] Concrete is the most consumed building material in the world. Cement, as the cementing material of concrete, is the most used material in human history besides water. China is the world's largest cement producer, accounting for half of the global output. Magnesium oxysulfate cement is an air-hardening cementing material with a ternary system of MgO-MgSO4-H2O as the reaction system. Magnesium oxysulfate concrete is a lightweight concrete with magnesium oxysulfate cement as the cementing material. The raw materials usually include lightly burned magnesium oxide powder, magnesium sulfate, water, modifiers and fine aggregates. The preparation process of magnesium oxysulfate concrete includes the steps of preparing solution, mixing powder, stirring and grouting. The strength of concrete is mainly ensured by controlling the generation of hydration reaction phase. Like ordinary silicate concrete, the hydration reaction rate of magnesium oxysulfate concrete is closely related to the temperature of concrete and the surrounding environment. The higher the temperature, the faster the hydration reaction, the more heat the hydration reaction releases, the greater the temperature rise of concrete, the higher the concrete temperature, the faster the hydration reaction rate, and the hydration reaction of concrete has a self-catalytic effect. For large-volume concrete, if the initial hydration reaction rate is relatively fast, the concrete cannot dissipate heat in time, and the hydration reaction autocatalysis phenomenon is obvious, there will be problems such as large hydration reaction heat release, rapid increase in concrete internal temperature, difficult temperature control, concrete cracking, etc. On the contrary, when the temperature is low, the concrete hydration reaction rate is low, the hydration reaction time is long, the heat release is slow, the concrete solidification time becomes longer, and the early strength is reduced. Moreover, when the ambient temperature is below zero, the water in the concrete is easy to freeze, the volume expands, and the concrete is easy to crack.
[0004] In recent years, magnesium oxysulfate concrete has been used in hollow sandwich steel tube concrete structures due to its high strength, low density, good fluidity, and micro-expansion. The hollow sandwich concrete structure is a columnar structure formed by placing two steel tubes of different diameters concentrically and pouring lightweight high-strength concrete with micro-expansion characteristics between the two layers of steel tubes. During the stress process of this structure, the steel tube constrains the concrete, improving the plasticity and toughness of the concrete. The presence of concrete delays the local buckling of the steel tube and avoids the sudden failure of the steel tube rod under extreme external force. The micro-expansion characteristics of concrete further enhance the synergy between the steel tube and concrete, achieving effective force transmission. However, due to the self-catalytic effect of concrete hydration reaction, high requirements are placed on the on-site construction of concrete. When the ambient temperature is high in summer, the concrete is prone to the problem of too fast hydration reaction and difficult to control. When the temperature is low in winter, the hydration reaction rate of concrete is too low, and the initial setting time is long, so the components need to be placed in a curing kiln for curing. The construction of magnesium oxysulfate concrete is greatly affected by on-site conditions and weather, has a small range of applicable environments, and is poor in practicality. Summary of the invention
[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method for controlling the hydration reaction rate of magnesium oxysulfide concrete for hollow sandwich composite poles. By controlling the activity of concrete raw materials, the initial reaction temperature and the temperature of the hydration reaction process, the hydration reaction rate of concrete is regulated throughout the whole process to avoid concrete cracking due to excessively fast or slow hydration reaction rate, reduce the requirements of concrete on the construction environment, and improve the environmental applicability of concrete.
[0006] To achieve the above purpose, the technical solution adopted by the present invention to solve the technical problem is: A method for controlling the hydration reaction rate of magnesium oxysulfate concrete throughout the entire process. First, different magnesium oxide raw materials are selected according to the temperature of the construction environment, and the hydration reaction rate of the concrete is adjusted by controlling the reactivity of the raw materials; second, the initial hydration reaction rate of the concrete is adjusted by adjusting the solution temperature according to the ambient temperature and the selected magnesium oxide raw materials; finally, the temperature of the concrete during the initial curing process is adjusted by attaching a temperature control module to the outer surface of the steel pipe to achieve the purpose of adjusting the hydration reaction rate of the concrete. The specific process is as follows: (1) Select different magnesium oxide raw materials according to the construction environment temperature. The magnesium oxide raw material is light-burned magnesium oxide, and the ignition loss of the light-burned magnesium oxide meets the following requirements. When the construction environment temperature is lower than 10°C, the ignition loss of the light-burned magnesium oxide raw material should be between 2.5-4, when the construction environment temperature is between 10-25°C, the ignition loss of the light-burned magnesium oxide raw material should be between 2-2.5, and when the construction environment temperature is above 25°C, the ignition loss of the light-burned magnesium oxide raw material should be between 1.5-2.
[0007] (2) The temperature of the solution used in concrete mixing is regulated according to the construction environment temperature. The solution is prepared by dissolving magnesium sulfate and a modifier in water. When the construction environment temperature is lower than 10°C, the temperature of the solution is controlled between 40-44°C during concrete mixing. When the construction environment temperature is between 10-25°C, the temperature of the solution is controlled between 36-40°C. When the construction environment temperature is above 25°C, the temperature of the solution is controlled between 32-36°C.
[0008] (3) According to the needs of the on-site environment, 1-3 sets of temperature control modules can be installed on each section of the pole. When the ambient temperature is high, cold water is pumped into the circulating water pipe in the temperature control module through a circulating water pump. The heat released by the concrete hydration reaction is transferred to the heat conduction plate and the circulating water pipe through the outer steel pipe of the pole, and then the heat is taken away by the cold water flowing in the circulating water pipe. By quickly dissipating the heat, the temperature of the concrete is controlled, thereby controlling the hydration reaction rate of the concrete. When the ambient temperature is low, hot water is pumped into the circulating water pipe in the temperature control module through a circulating water pump. The heat carried by the hot water is transferred to the outer steel pipe of the pole through the circulating water pipe and the aluminum plate, and then the outer steel pipe of the pole is transferred to the concrete, preventing the concrete temperature from being too low to inhibit the hydration reaction, thereby achieving the purpose of regulating the hydration reaction rate of the concrete. The temperature control module consists of a heat conduction plate, a circulating water pipe and a clamp. The heat conducting plate of the temperature control module is a long strip of aluminum plate with a certain curvature, with a length of 1500-2000mm, a curvature of π / 4-π / 2, an aluminum plate thickness of 3-6mm, and a diameter of 500-2000mm. The circulating water pipe of the temperature control module is a copper pipe with a diameter of 8-22mm and a wall thickness of 0.6-1.2mm. The circulating water pipe is fixed to the heat conducting plate by spot welding. The material of the clamp is carbon steel, the clamp consists of 2 sections, the diameter of the clamp is equivalent to the diameter of the rod body, the curvature of the single-section clamp is less than π, and the two ends of the clamp are equipped with 2 bolt holes, and the clamp is equipped with 4 connecting bolts. When pouring concrete, the temperature control module is composed of 3-6 blocks in a group, which are fixed to the rod body by clamps. The upper and lower ends of each group of temperature control modules are each fixed to the rod body by a group of clamps.
[0009] The present invention adjusts the reaction activity of the concrete itself by controlling the ignition loss of light-burned magnesium oxide, the raw material of magnesium oxysulfide concrete; adjusts the initial temperature of the concrete slurry after stirring by controlling the solution temperature; adjusts the temperature of the concrete in the rod body by installing a temperature adjustment module on the rod body; and finally controls the hydration reaction rate of the concrete by combining the ambient temperature, the reaction activity of the concrete itself, and the concrete temperature. The purpose is to increase the initial hydration reaction rate as much as possible, improve production efficiency, and ensure production quality under the premise of ensuring that the concrete has good construction performance and mechanical properties.
[0010] The beneficial effects of the present invention are as follows: 1) The present invention controls the reactivity of concrete itself through raw materials to prevent the concrete from being too active, causing the initial reaction rate to be too high, the temperature to rise too quickly, and the reaction to be out of control and cracking. It is also to prevent the concrete from freezing and cracking due to low concrete activity and low initial reaction rate during low-temperature construction, which reduces the concrete strength. 2) The present invention controls the temperature of the magnesium oxysulfide concrete preparation solution to adjust the initial temperature of the concrete slurry after stirring, thereby preventing the concrete from reacting too quickly due to an excessively high initial temperature, or from reacting too slowly due to an excessively low initial temperature.
[0011] 3) The present invention adjusts the temperature of the concrete in the rod body by passing cold water through the temperature control module, controls the hydration reaction rate during the concrete curing process, and avoids the concrete hydration reaction from being too fast to cause self-catalysis, sudden increase in concrete temperature, and concrete cracking. At the same time, the present invention can also adjust the temperature of the concrete in the rod body by passing hot water through the temperature control module, avoiding too low concrete temperature, too slow hydration reaction, concrete freezing and cracking, and reduced strength.
[0012] 4) The present invention combines the ambient temperature of the construction site, regulates the reaction activity of magnesium oxysulfide concrete itself and the temperature of the concrete, and can ensure that the concrete hydration reaction rate is moderate, and ensures that the concrete has good fluidity and a long initial setting time, and also has good bearing performance. It effectively avoids the phenomenon of concrete cracking and strength reduction caused by excessively high or low concrete temperature. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a schematic diagram of the temperature control module installation; Figure 2 This is the temperature control module diagram; Among them, 1 is the rod flange, 2 is the clamp, 3 is the connecting bolt, 4 is the heat conduction plate, 5 is the circulating water pipe, 6 is the inner steel pipe, 7 is concrete, and 8 is the outer steel pipe. DETAILED DESCRIPTION
[0014] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.
[0015] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof; As introduced in the background technology, in the prior art, large-volume concrete has the problems of slow heat dissipation of hydration reaction, self-catalysis, sudden temperature increase and cracking. At the same time, during low-temperature construction, the concrete temperature is low, the hydration reaction is slow, and ice cracking occurs. In order to solve the above technical problems, the present invention proposes a method for controlling the hydration reaction rate of magnesium oxysulfide concrete for hollow sandwich composite poles.
[0016] A typical embodiment of the present invention provides a method for controlling the hydration reaction rate of magnesium oxysulfate concrete for hollow sandwich composite poles, and the specific process is as follows: (1) Determine the construction environment temperature.
[0017] (2) Determine the ignition loss of light-burned magnesium oxide, the raw material of magnesium oxysulfate concrete, according to the construction environment temperature, and select light-burned magnesium oxide with corresponding parameters.
[0018] (3) Determine the required solution temperature of magnesium oxysulfide concrete according to the construction environment. The required solution of magnesium oxysulfide concrete is prepared by mixing magnesium sulfate, modifier and water in proportion. The solution is adjusted to the required temperature range by adjusting the temperature of the added mixing water and cooperating with a water bath.
[0019] (4) Determine the required number of temperature control modules based on the construction environment temperature, pole height, diameter and concrete volume, and fix the temperature control modules on the pole with clamps.
[0020] (5) Weigh appropriate amounts of light-burned magnesium oxide and fine aggregate according to the concrete mix ratio and mix well for later use.
[0021] (6) Weigh appropriate amounts of solvent and water according to the concrete mix ratio and mix the solution to the required temperature range.
[0022] (7) Pour the solution and powder into a mixing container and mix them. Use a grouting pump to pour the concrete slurry into the hollow sandwich steel pipe. Use a circulating water pump to pass circulating water into the control module to control the concrete temperature to be no lower than 10°C and no higher than 60°C.
[0023] Example 1 The present invention provides a method for controlling the hydration reaction rate of magnesium oxysulfate concrete for hollow sandwich composite poles, and the specific process is as follows: (1) The construction environment temperature is 30-36℃.
[0024] (2) According to the construction environment temperature, the ignition loss of light-burned magnesium oxide should be between 1.5 and 2; the actual ignition loss of light-burned magnesium oxide purchased is about 1.7%, the purity is 90.3%, and the particle size is 200 mesh.
[0025] (3) According to the construction environment temperature, the temperature of magnesium oxysulfide concrete solution must be controlled at 32-36°C. The solution required for magnesium oxysulfide concrete is made of magnesium sulfate, modifier and water in proportion. Heating the mixing water to about 70°C can quickly dissolve the solvent and adjust the solution temperature to the required temperature range.
[0026] (4) The diameter of the concrete rod to be poured is φ1060mm, the height is 8000mm, and the concrete volume is 2.11m 3 . According to the construction environment temperature, rod diameter, rod height and concrete volume, it is determined that the required temperature control modules are 2 groups, each group contains 3 temperature control modules. The temperature control module consists of a heat conducting plate 4, a circulating water pipe 5 and a clamp 2. The heat conducting plate 4 of the temperature control module is a long strip of aluminum plate with a certain curvature, with a length of 2000mm, a curvature of π / 2, a thickness of 6mm and a diameter of 1060mm. The circulating water pipe 5 of the temperature control module is a copper pipe with a diameter of 16mm and a wall thickness of 1mm. The length of the circulating water pipe of the temperature control module is 5.2m, and the circulating water pipe is evenly fixed on the heat conducting plate by spot welding. The material of the clamp 2 is carbon steel, the clamp consists of 2 sections, the diameter of the clamp is 1060mm, the arc length of the single section clamp is 1580mm, the two ends of the clamp are equipped with 2 bolt holes, and the clamp is equipped with 4 connecting bolts 3 with a length of 180mm. Each set of temperature control modules is fixed to the rod body by a set of clamps at the upper and lower ends.
[0027] (5) Prepare powder material in the ratio of light-burned magnesium oxide: fine aggregate = 100:8, stir evenly and set aside; (6) According to the modifier addition amount of 1%, magnesium oxide: magnesium sulfate: water = 9:1:18 molar ratio, weigh appropriate amount of solvent and water to prepare the solution until it is completely dissolved; (7) When the solution temperature drops to 32-36°C, pour the solution and powder into a mixing container and stir until uniform. Use a grouting pump to pour the concrete slurry into the hollow sandwich steel pipe. Use a circulating water pump to supply room temperature water to the control module to control the concrete temperature to no higher than 60°C.
[0028] The temperature of the concrete slurry was measured by an infrared thermometer and was found to be 33°C. After the concrete was poured, the temperature of the steel pipe outside the rod was measured every hour. The results showed that the temperature of the concrete rose slowly. 12 hours after the concrete was poured, the temperature reached 56°C and then slowly decreased.
[0029] Example 2 The present invention provides a method for controlling the hydration reaction rate of magnesium oxysulfate concrete for hollow sandwich composite poles, and the specific process is as follows: (1) The construction environment temperature is 3-10℃.
[0030] (2) According to the construction environment temperature, the ignition loss of light-burned magnesium oxide should be between 2.5 and 4; the actual ignition loss of light-burned magnesium oxide purchased is about 3.0%, the purity is 89.6%, and the particle size is 200 mesh.
[0031] (3) According to the construction environment temperature, the temperature of magnesium oxysulfide concrete solution must be controlled at 40-44°C. The solution required for magnesium oxysulfide concrete is prepared by mixing magnesium sulfate, modifier and water in proportion. The mixing water is heated to 100°C, and a water bath is used to quickly dissolve the solvent and adjust the solution to the required temperature.
[0032] (4) The diameter of the concrete rod to be poured is φ900mm, the height is 8000mm, and the concrete volume is 1.72m 3 . According to the construction environment temperature, rod diameter, rod height and concrete volume, it is determined that the required temperature control modules are 2 groups, each group contains 3 temperature control modules. The temperature control module consists of a heat conducting plate 4, a circulating water pipe 5 and a clamp 2. The heat conducting plate 4 of the temperature control module is a long strip of aluminum plate with a certain curvature, a length of 2000mm, a curvature of π / 2, an aluminum plate thickness of 6mm, and a diameter of 900mm. The circulating water pipe 5 of the temperature control module is a copper pipe with a diameter of 20mm and a wall thickness of 0.8mm. The circulating water pipe of the temperature control module is 5.2m long, and the circulating water pipe is evenly fixed on the heat conducting plate by spot welding. The material of the clamp 2 is carbon steel, the clamp consists of 2 sections, the diameter of the clamp is 900mm, the arc length of the single section clamp is 1360mm, the two ends of the clamp are equipped with 2 bolt holes, and the clamp is equipped with 4 connecting bolts 3 with a length of 180mm. Each set of temperature control modules is fixed to the rod body by a set of clamps at the upper and lower ends.
[0033] (5) Prepare powder material in the ratio of light-burned magnesium oxide: fine aggregate = 100:8, stir evenly and set aside; (6) According to the modifier addition amount of 1%, magnesium oxide: magnesium sulfate: water = 9:1:18 molar ratio, weigh appropriate amount of solvent and water to prepare the solution until it is completely dissolved; (7) When the solution temperature is adjusted to 40-40°C, pour the solution and powder into the mixing container and stir until uniform. Use a grouting pump to pour the concrete slurry into the hollow sandwich steel pipe. Use a circulating water pump to pass 80°C hot water into the control module to control the concrete temperature to not be lower than 20°C.
[0034] The temperature of the concrete slurry was measured by an infrared thermometer and was found to be 30°C. After the concrete was poured, the temperature of the steel pipe outside the rod was measured every hour. The results showed that the temperature of the concrete rose slowly. After 16 hours of concrete pouring, the temperature reached 38°C and then slowly decreased.
[0035] Example 3 The present invention provides a method for controlling the hydration reaction rate of magnesium oxysulfate concrete for hollow sandwich composite poles, and the specific process is as follows: (1) The construction environment temperature is 18-22℃.
[0036] (2) According to the construction environment temperature, the ignition loss of light-burned magnesium oxide should be between 2.0 and 2.5; the actual ignition loss of light-burned magnesium oxide purchased is about 2.2%, the purity is 90.1%, and the particle size is 200 mesh.
[0037] (3) According to the construction environment temperature, the temperature of magnesium oxysulfide concrete solution must be controlled at 36-40°C. The solution required for magnesium oxysulfide concrete is made of magnesium sulfate, modifier and water in proportion. Heating the mixing water to about 100°C can quickly dissolve the solvent and adjust the solution temperature to the required temperature range.
[0038] (4) The diameter of the concrete rod to be poured is φ692mm, the height is 7000mm, and the concrete volume is 0.76m 3 . According to the construction environment temperature, rod diameter, rod height and concrete volume, it is determined that the required temperature control module is 1 group, and each group contains 3 temperature control modules. The temperature control module consists of a heat conduction plate 4, a circulating water pipe 5 and a clamp 2. The heat conduction plate 4 of the temperature control module is a long strip of aluminum plate with a certain curvature, a length of 1500mm, a curvature of π / 2, an aluminum plate thickness of 3mm, and a diameter of 700mm. The circulating water pipe 5 of the temperature control module is a copper pipe with a diameter of 8mm and a wall thickness of 0.6mm. The length of the circulating water pipe of the temperature control module is 3.6m, and the circulating water pipe is evenly fixed on the heat conduction plate by spot welding. The material of the clamp 2 is carbon steel, the clamp consists of 2 sections, the diameter of the clamp is 700mm, the arc length of the single-section clamp is 1030mm, the two ends of the clamp are equipped with 2 bolt holes, and the clamp is equipped with 4 connecting bolts 3 with a length of 180mm. Each set of temperature control modules is fixed to the rod body by a set of clamps at the upper and lower ends.
[0039] (5) Prepare powder material in the ratio of light-burned magnesium oxide: fine aggregate = 100:8, stir evenly and set aside; (6) According to the modifier addition amount of 1%, magnesium oxide: magnesium sulfate: water = 9:1:18 molar ratio, weigh appropriate amount of solvent and water to prepare the solution until it is completely dissolved; (7) When the solution temperature drops to 36-40°C, pour the solution and powder into a mixing container and stir until uniform. Use a grouting pump to pour the concrete slurry into the hollow sandwich steel pipe. Use a circulating water pump to supply room temperature water to the control module to control the concrete temperature to no higher than 60°C.
[0040] The temperature of the concrete slurry was measured by an infrared thermometer and was found to be 33.2°C. After the concrete was poured, the temperature of the steel pipe outside the rod was measured every hour. The results showed that the temperature of the concrete rose slowly. 13 hours after the concrete was poured, the temperature reached 52°C and then slowly decreased.
[0041] Comparative Example 1 A method for controlling the hydration reaction rate of magnesium oxysulfide concrete for a hollow sandwich composite pole provided by the present invention is not adopted to cast a hollow sandwich concrete component on site: (1) The construction environment temperature is 32-35℃.
[0042] (2) The lightly burned magnesium oxide purchased has a loss on ignition of about 2.8%, a purity of 88.7%, and a particle size of 200 mesh.
[0043] (3) The solution required for magnesium oxysulfate concrete is prepared by mixing magnesium sulfate, modifier and water in proportion. The temperature of the prepared solution is 42°C.
[0044] (4) The diameter of the concrete rod to be poured is φ462mm, the height is 1400mm, and the concrete volume is 0.15m 3 . The temperature control module is not used for temperature control.
[0045] (5) Prepare powder material in the ratio of light-burned magnesium oxide: fine aggregate = 100:8, stir evenly and set aside; (6) According to the modifier addition amount of 1%, magnesium oxide: magnesium sulfate: water = 9:1:18 molar ratio, weigh appropriate amount of solvent and water to prepare the solution until it is completely dissolved; (7) When the solution temperature is 42°C, pour the solution and powder into a mixing container and stir until uniform. Use a grouting pump to pour the concrete slurry into the hollow sandwich steel pipe.
[0046] The temperature of the concrete slurry measured by an infrared thermometer was 40°C. The concrete slurry was viscous and had poor fluidity. After the concrete was poured, the temperature of the steel pipe was measured to be 41°C. One hour later, the temperature of the steel pipe was 71°C. Two hours later, the temperature rose to 89°C. The self-catalysis of the concrete caused the hydration reaction to be too fast and the temperature to rise sharply.
Claims
1. A method for achieving full control of the hydration reaction rate of magnesium oxysulfate concrete, characterized in that: The following steps are involved: (1) Select different magnesium oxide raw materials according to the temperature of the construction environment, and adjust the hydration reaction rate of concrete by controlling the reactivity of the raw materials; (2) According to the ambient temperature and the selected magnesium oxide raw material, the initial hydration reaction rate of the concrete is adjusted by regulating the solution temperature; (3) By attaching a temperature control module to the outer surface of the steel pipe, the temperature of the concrete during the initial curing process is regulated to control the concrete hydration reaction rate.
2. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 1, characterized in that: Different magnesium oxide raw materials are selected according to the construction environment temperature. The magnesium oxide raw material is light-burned magnesium oxide, and the loss on ignition of the light-burned magnesium oxide meets the following requirements: when the construction environment temperature is lower than 10°C, the loss on ignition of the light-burned magnesium oxide raw material is between 2.5-4, when the construction environment temperature is between 10-25°C, the loss on ignition of the light-burned magnesium oxide raw material is between 2-2.5, and when the construction environment temperature is above 25°C, the loss on ignition of the light-burned magnesium oxide raw material is between 1.5-2.
3. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 1, characterized in that: The temperature of the solution used in concrete mixing is regulated according to the construction environment temperature. The solution is formed by dissolving magnesium sulfate and a modifier in water: when the construction environment temperature is lower than 10°C, the temperature of the solution is controlled between 40-44°C during concrete mixing; when the construction environment temperature is between 10-25°C, the temperature of the solution is controlled between 36-40°C; when the construction environment temperature is above 25°C, the temperature of the solution is controlled between 32-36°C.
4. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 1, characterized in that: The temperature control module is composed of a heat conducting plate (4), a circulating water pipe (5) and a clamp (2); the circulating water pipe (5) is fixed to the heat conducting plate (4) by spot welding; when pouring concrete, the temperature control module is composed of 3 to 6 blocks and is fixed to the rod body by the clamp (2).
5. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: The heat conducting plate (4) of the temperature regulating module is a long strip of aluminum plate with a certain curvature, with a length of 1500-2000 mm, a curvature of π / 4-π / 2, a thickness of 3-6 mm, and a diameter of 500-2000 mm.
6. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: The circulating water pipe (5) of the temperature control module is a copper pipe with a diameter of 8-22 mm and a wall thickness of 0.6-1.2 mm.
7. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: The clamp (2) is made of carbon steel and consists of two sections. The diameter of the clamp is equivalent to the diameter of the rod body. The arc of a single section of the clamp is less than π. Two bolt holes are provided at both ends of the clamp and the clamp is provided with four connecting bolts.
8. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: Each set of temperature control modules is fixed to the rod body by a set of clamps at the upper and lower ends.
9. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: Each section of the rod can be equipped with 1-3 sets of temperature control modules.
10. A method for achieving full-process controllable hydration reaction rate of magnesium oxysulfate concrete according to claim 4, characterized in that: When the ambient temperature is high, cold water is pumped into the circulating water pipe in the temperature control module through a circulating water pump, and the heat released by the concrete hydration reaction is conducted to the heat conduction plate and the circulating water pipe through the outer steel pipe of the pole, and then the heat is taken away by the cold water flowing in the circulating water pipe. By quickly dissipating the heat, the temperature of the concrete is controlled, thereby controlling the hydration reaction rate of the concrete; when the ambient temperature is low, hot water is pumped into the circulating water pipe in the temperature control module through a circulating water pump, and the heat carried by the hot water is conducted to the outer steel pipe of the pole through the circulating water pipe and the aluminum plate, and the outer steel pipe of the pole is then conducted to the concrete, preventing the concrete temperature from being too low to inhibit the hydration reaction, thereby achieving the purpose of regulating the hydration reaction rate of the concrete.