In-situ multi-channel concrete adiabatic temperature rise testing device and method based on temperature control compensation

Abstract

The present application relates to a kind of in-situ multi-channel concrete adiabatic temperature rise testing device and method based on temperature control compensation, comprising the following steps: (1) the calibration of temperature control compensation system heating efficiency is carried out, and the temperature compensation value X is determined;(2) freshly mixed concrete is prepared in-situ, and the overall connection of test equipment is completed;(3) temperature control compensation system starts to work, and computer automatically records temperature rise data;The method can use engineering actual raw materials under in-situ conditions in engineering site, form adiabatic condition completely through temperature control compensation, realize adiabatic environment by heating air temperature control, without thick thermal insulation material, effectively reduce the dead weight and size of equipment, overcome the defects that traditional adiabatic device and method are relatively heavy, difficult to test multi-channel concrete adiabatic temperature rise value based on in-situ conditions in engineering site simultaneously.

Description

Technical Field

[0001] This invention relates to a testing device and method for the thermal temperature rise of concrete, specifically an in-situ multi-channel testing device and method for the thermal temperature rise of concrete based on temperature control compensation. Background Technology

[0002] During the setting and hardening process, concrete releases a large amount of heat of hydration. Excessive heat of hydration often leads to large temperature differences between the inside and outside of the concrete, causing thermal stress and cracking. Once cracked, the concrete's resistance to penetration is significantly reduced, leading to leakage and severely affecting the structure's service performance. The presence of cracks accelerates the transmission rate of harmful media, exacerbates the deterioration of the material's properties and the corrosion of reinforcing steel, especially in harsh corrosive environments such as high temperature and high salinity, greatly shortening the structure's service life.

[0003] Therefore, developing relevant construction measures to reduce the temperature difference between the inside and outside of concrete is of great significance for ensuring the smooth progress and safety of concrete construction. However, measures to reduce the temperature difference between the inside and outside of concrete are costly, and a reasonable temperature control scheme needs to be developed based on the adiabatic temperature rise parameters of the concrete to ensure both the quality and economy of the project.

[0004] Currently, assessing the cracking risk of concrete often requires testing its material thermal parameters. However, adiabatic temperature rise parameters are typically determined using large-scale concrete adiabatic temperature rise testing instruments. These instruments are so large and heavy that they can only be used in fixed laboratory settings. Furthermore, most current adiabatic temperature rise testing instruments can only test the thermal parameters of a single concrete mix proportion. In reality, concrete thermal parameters are primarily related to the mix proportion and the properties of raw materials. Testing the thermal parameters of concrete at the construction site requires using raw materials actually used in the project, and simultaneously testing the thermal parameters of multiple concrete mix proportions for optimization. Therefore, current large-scale concrete adiabatic temperature rise testing instruments are bulky, heavy, and expensive. They lack the capability for portable on-site testing and simultaneous testing of multiple concrete mix proportions. There is an urgent need for a multi-channel portable concrete adiabatic temperature rise testing device to conduct in-situ thermal parameter testing. Summary of the Invention

[0005] For situations with harsh site conditions, in order to measure the adiabatic temperature rise parameters of concrete, this invention provides an in-situ multi-channel concrete adiabatic temperature rise testing device and method based on temperature control compensation. Using this device and method, under harsh site conditions, multiple sets of concrete with different mix proportions can be tested simultaneously in an adiabatic environment to measure the adiabatic temperature rise parameters of concrete hydration process, which is convenient and quick for simultaneous testing of concrete adiabatic temperature rise parameters.

[0006] This invention achieves the above objective through the following technical solution: an in-situ multi-channel concrete adiabatic temperature rise test method based on temperature control compensation, comprising the following steps:

[0007] (1) Calibrate the heating efficiency of the temperature control compensation system and determine the temperature compensation value X:

[0008] Add hot water at 50-60℃ to the inner tank and record the temperature of the hot water at the center of the inner tank as T. 中 The hot water temperature at the edge of the inner tank is T. 边 Install the sensor and temperature heating module in the corresponding positions, and record the sensor temperature inside the box as T. 箱 Set the target temperature of the air temperature heating module to T. 箱 =(T 中 +T 边 ) / 2+X, where X is the temperature compensation value; adjust the value of X so that the values ​​of T1 and T2 remain stable, that is, the temperature of the hot water in the inner tank no longer changes, then it is considered that the insulation conditions between the inner tank and the box have been formed under the temperature compensation value of X.

[0009] (2) Prepare freshly mixed concrete in situ and complete the overall connection of the test equipment:

[0010] The concrete was prepared using the actual raw materials used in the project and according to the actual mix proportions. The freshly mixed concrete sample was placed in the inner liner of a sample bucket with a multi-layered heat insulation structure. A single-opening copper tube was inserted into the center and edge of the concrete sample, with the open side protruding 5cm from the surface of the concrete sample. The temperature sensor was inserted into the single-opening copper tube through a small hole in the top of the sample bucket lid. The entire sample bucket, along with the temperature sensor and the air temperature heating module, was placed inside the insulation test chamber and connected to the temperature measurement and instrument controller, which was connected to a computer.

[0011] (3) The temperature control compensation system starts working, and the computer automatically records the temperature rise data:

[0012] The computer controls the air temperature heating module to start working via the instrument controller, raising the internal temperature T of the insulation test chamber. 箱 =(T 中 +T 边 () / 2+X, thereby achieving an adiabatic environment; the computer automatically records the concrete temperature rise data as a technical reference for engineering applications; when multiple channels are working simultaneously, multiple devices are connected in parallel to the temperature measurement and instrument controller to conduct adiabatic temperature rise tests synchronously.

[0013] The aforementioned in-situ multi-channel concrete insulation temperature rise testing device based on temperature compensation comprises an insulation test chamber, a sample bucket, a concrete sample, a single-opening copper tube, a temperature sensor, an air temperature heating module, a temperature measurement and instrument control system, and a computer. The insulation test chamber is small in size and equipped with hinges for easy opening and closing. The sample bucket is placed inside the insulation test chamber and has a multi-layered structure: a double-layered insulation aluminum alloy outer shell and a disposable aluminum alloy inner liner. A small hole is located at the top of the lid. The concrete sample is placed inside the inner liner. The sealed end of the single-opening copper tube is inserted into the concrete sample, while the open end protrudes from the surface of the concrete sample. The temperature sensor is inserted into the open side of the copper tube through the small hole at the top of the sample bucket. Two additional temperature sensors are also arranged inside the insulation test chamber. Two air temperature heating modules are arranged between the temperature sensors. The temperature sensors and air temperature heating modules are connected to the temperature measurement and instrument control system. The temperature measurement and instrument control system is connected to the computer, which records the internal temperature change process of the device while ensuring the concrete sample remains in an insulation environment.

[0014] The aforementioned thermal insulation environment is formed by both thermal insulation and temperature balance compensation; the thermal insulation test chamber and sample barrel are made of thermal insulation material, which can prevent most of the heat loss.

[0015] The aforementioned thermal insulation environment is mainly formed by temperature control compensation; the thermal insulation test chamber and sample barrel do not need to be made of thick thermal insulation material, which can reduce the weight and size of the device;

[0016] In the aforementioned in-situ multi-channel concrete adiabatic temperature rise testing device based on temperature control compensation, any single channel can work independently after being connected to a computer. The actual number of channels used can be adjusted according to the test requirements, and the weight of the equipment contained in a single channel is less than 30kg, which can be conveniently transported to restricted sites such as engineering sites to carry out tests.

[0017] The outstanding advantages of this invention are:

[0018] 1. It can be transported to various engineering sites or laboratories for concrete thermal parameter testing without being restricted by the usage site, thanks to its relatively small size and weight.

[0019] 2. It can simultaneously test the adiabatic temperature rise parameters of multiple sets of concrete with different mix proportions, and each set of tests is independent of each other. The test of concrete thermal parameters in any channel can be stopped or started at any time.

[0020] 3. It can create an adiabatic environment by utilizing temperature balance compensation conditions and accurately measure the adiabatic temperature rise data of concrete using high-precision sensors. Attached Figure Description

[0021] Figure 1This is a schematic diagram of the in-situ multi-channel concrete adiabatic temperature rise testing device based on temperature balance compensation as described in this invention.

[0022] Figure 2 This is a graph showing the temperature rise of the concrete adiabatic system in the example. Detailed Implementation

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example 1

[0025] This embodiment describes the in-situ multi-channel concrete adiabatic temperature rise testing device based on temperature control compensation. It consists of an adiabatic test chamber 1, a sample container 2, a concrete sample 3, a single-opening copper tube 4, a temperature sensor 5, an air temperature heating module 6, a temperature measurement and instrument controller 7, and a computer 8. The adiabatic test chamber 1 is relatively small and equipped with hinges for easy opening and closing. The sample container 2 is placed inside the adiabatic test chamber 1 and has a multi-layered structure. The outer shell is a double-layered insulated aluminum alloy container, and the inner liner is a disposable aluminum alloy container. The top of the container lid has a small hole. The concrete sample 3 is placed inside the inner liner. The single-opening copper tube... One sealed end of tube 4 is inserted into the concrete sample, and the open end of the single-opening copper tube 4 protrudes from the surface of the concrete sample. Temperature sensor 5 is inserted into the open side of the single-opening copper tube 4 through a small hole at the top of the sample bucket 2. At the same time, two temperature sensors 5 are provided inside the insulation test chamber 1, and two air temperature heating modules 6 are provided between the temperature sensors 5. The temperature sensors 5 and the air temperature heating modules 6 are connected to the temperature measurement and instrument controller 7. The temperature measurement and instrument controller 7 is connected to the computer 8, which records the internal temperature change process of the device and ensures that the concrete sample is in an insulation environment.

[0026] The thermal insulation test chamber 1 and sample container 2 are made of thermal insulation material, which can prevent most of the heat loss. The thermal insulation test chamber 1 and sample container 2 do not need to be made of thick thermal insulation material, which can reduce the weight and size of the device.

[0027] The aforementioned thermal insulation environment is formed by both thermal insulation materials and temperature balance compensation.

[0028] Example 2

[0029] This embodiment describes the in-situ multi-channel concrete adiabatic temperature rise test method based on temperature balance compensation according to the present invention, including the following steps:

[0030] Using the actual raw materials used in the project, two sets of concrete were prepared according to the following mix proportions at the construction site:

[0031]

[0032] After instrument calibration, two sets of freshly mixed concrete samples were placed inside the sample container 2, which has a multi-layered insulation structure. One sealed end of the single-opening copper tube 4 was inserted into the center of the concrete sample 3, with the open end slightly protruding from the surface of the concrete sample. The temperature sensor 5 was inserted into the single-opening copper tube 4 through a small hole in the top of the sample container lid. The entire sample container 2, along with the temperature sensor 5 and the air temperature heating module 6, was placed inside the insulation test chamber 1 and connected to the temperature measurement and instrument controller 7, which was connected to the computer 8. The computer 8 controlled the air temperature heating module 6 to start working through the temperature measurement and instrument controller 7, ensuring that the temperature inside the insulation test chamber 1 and the center of the concrete sample reached equilibrium, thus achieving an insulation environment. The computer 8 automatically recorded the concrete thermal parameters, such as... Figure 2 As shown.

[0033] When multiple channels are operating simultaneously, multiple devices are connected in parallel to the temperature measurement and instrument controller 7. Figure 2 The first group of concrete has an adiabatic temperature rise of 40℃, and the second group of concrete has an adiabatic temperature rise of 36℃.

Claims

1. A method for in-situ multi-channel concrete adiabatic temperature rise testing based on temperature control compensation, characterized in that, The in-situ multi-channel concrete insulation temperature rise testing device based on temperature control compensation was used for testing. The testing device includes an insulation test chamber, a sample barrel, a single-opening copper tube, a temperature sensor, an air temperature heating module, a temperature measurement and instrument controller, and a computer. The sample barrel is placed inside the insulation test chamber. The sealed end of the single-opening copper tube is inserted into the concrete sample, while the open end of the single-opening copper tube protrudes from the surface of the concrete sample. The temperature sensor is inserted into the open side of the copper tube through a small hole at the top of the sample barrel. A temperature sensor is installed inside the insulation test chamber, and an air temperature heating module is located in the middle of the temperature sensor. The temperature measurement and instrument controller is connected to the temperature sensor and the air temperature heating module. The temperature measurement and instrument controller is connected to the computer. The sample barrel includes an inner liner. The specific steps of the aforementioned test method are as follows: (1) Calibrate the heating efficiency of the temperature control compensation system and determine the temperature compensation value X. Add hot water at 50-60℃ to the inner tank and record the temperature of the hot water at the center of the inner tank as T. 中 The hot water temperature at the edge of the inner tank is T. 边 Install the sensor and temperature heating module in the corresponding positions, and record the sensor temperature inside the insulation test chamber as T. 箱 Set the target temperature of the air temperature heating module to T. 箱 = (T 中 +T 边 ) / 2+X, where X is the temperature compensation value; adjust the value of X so that T 中 With T 边 If the value remains stable and unchanged, that is, the temperature of the hot water in the inner tank no longer changes, then it is considered that the insulation conditions between the inner tank and the insulation test chamber have been formed under the X temperature compensation value. (2) Prepare fresh concrete in situ and complete the overall connection of the test equipment. Using the actual raw materials used in the project, concrete is prepared according to the actual mix proportion. The freshly mixed concrete sample is placed in the inner liner of a sample bucket with a multi-layer heat insulation structure. A single-opening copper tube is inserted into the center and edge of the concrete sample, with the open side protruding 5cm from the surface of the concrete sample. The temperature sensor is inserted into the single-opening copper tube through a small hole in the top of the sample bucket lid. The entire sample bucket, along with the temperature sensor and the air temperature heating module, is placed inside the insulation test chamber. The temperature sensor and the air temperature heating module are connected to the temperature measurement and instrument controller, which is connected to a computer. (3) The temperature control compensation system starts working, and the computer automatically records the temperature rise data. The computer, through temperature measurement and instrument controller, activates the air temperature heating module, raising the internal temperature T′ of the insulation test chamber. 箱 =(T′ 中 +T′ 边 () / 2+X, thereby achieving an adiabatic environment. The computer automatically records the concrete temperature rise data as a reference for engineering applications. When multiple channels are working simultaneously, multiple devices are connected in parallel to the temperature measurement and instrument controller to conduct adiabatic temperature rise tests synchronously.

2. The test method according to claim 1, characterized in that, The aforementioned thermal insulation test chamber is equipped with hinges.

3. The test method according to claim 1, characterized in that, The sample container has a multi-layer structure, with a double-layer insulated aluminum alloy outer shell and a disposable aluminum alloy inner liner. The top of the lid has a small hole.

4. The test method according to claim 1, characterized in that, The insulation test chamber is equipped with two temperature sensors inside, and two air temperature heating modules are located between the two temperature sensors.

5. The test method according to claim 1, characterized in that, Each single channel can work independently after being connected to a computer, and the actual number of channels used can be adjusted according to experimental needs.

6. The test method according to claim 1, characterized in that, The aforementioned thermal insulation environment is formed by both thermal insulation materials and temperature balance compensation.

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