阅读说明：本技术 一种基于混凝土绝热温升的自生体积变形测试设备 (Self-generating volume deformation testing equipment based on concrete heat insulation and temperature rise ) 是由 刘数华 高富豪 王露 任志盛 王浩 葛宇川 涂拥军 阮燕 于 2020-12-17 设计创作，主要内容包括：本发明公开了一种基于混凝土绝热温升的自生体积变形测试设备,包括绝热试验箱、钢桶、加热器、环境温度传感器、试件温度传感器、电阻应变计和计算机控制系统；钢桶安装在所述绝热试验箱中,在钢桶内装有待测量的混凝土试样,并且在钢桶内部混凝土试样中埋设试件温度传感器、试件pH值传感器以及电阻应变计；所述绝热试验箱和钢桶的空腔部分装有液体,并在其中设置有环境温度传感器和加热器。本发明能准确测试混凝土的绝热温升、以及相应温度变化条件下的自生体积变形和孔隙溶液pH值,以便获取坝体内部混凝土热学性能、变形性能及碱度的长期变化规律。该设备操作简单,实用性强。(The invention discloses a self-generated volume deformation test device based on concrete heat insulation temperature rise, which comprises a heat insulation test box, a steel barrel, a heater, an environment temperature sensor, a test piece temperature sensor, a resistance strain gauge and a computer control system, wherein the heat insulation test box is connected with the steel barrel; the steel drum is installed in the heat insulation test box, a concrete sample to be measured is installed in the steel drum, and a test piece temperature sensor, a test piece pH value sensor and a resistance strain gauge are embedded in the concrete sample in the steel drum; the cavity parts of the heat insulation test box and the steel barrel are filled with liquid, and an ambient temperature sensor and a heater are arranged in the cavity parts. The method can accurately test the adiabatic temperature rise of the concrete, the autogenous volume deformation under the corresponding temperature change condition and the pH value of the pore solution, so as to obtain the long-term change rule of the thermal property, the deformation property and the alkalinity of the concrete in the dam body. The equipment is simple to operate and high in practicability.)

1. The utility model provides a from generating volume deformation test equipment based on adiabatic temperature rise of concrete which characterized in that: the device comprises a heat insulation test box, a steel barrel, a heater, an environment temperature sensor, a test piece temperature sensor, a resistance strain gauge and a computer control system; the steel drum is installed in the heat insulation test box, a concrete sample to be measured is installed in the steel drum, and a test piece temperature sensor, a test piece pH value sensor and a resistance strain gauge are embedded in the concrete sample in the steel drum; the cavity parts of the heat insulation test box and the steel barrel are filled with liquid, and an ambient temperature sensor and a heater are arranged in the cavity parts.

2. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the environment temperature sensor, the test piece temperature sensor, the resistance strain gauge and the heater are all connected with a computer control system; the measurement of the environment temperature sensor, the test piece temperature sensor and the resistance strain gauge is displayed by the computer control system, the temperature collected by the test piece temperature sensor is transmitted to the computer control system, the temperature of the water in the environment temperature sensing collection box is transmitted to the computer control system, and the computer control system controls the heater to enable the temperature of the liquid in the cavity of the heat insulation test box and the cavity of the steel barrel to be the same as the temperature in the concrete.

3. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the bottom of the heat insulation test box is provided with a heat insulation plate, and the steel barrel is placed on the heat insulation plate at the bottom of the heat insulation test box.

4. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the device is characterized by further comprising a test piece PH sensor, wherein the test piece PH sensor is connected with the computer control system, and the computer control system displays the pH value in the concrete sample.

5. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the heat insulation test box is made of heat insulation materials.

6. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the environment temperature sensor, the test piece PH sensor, the strain gauge and the heater are all connected with the computer control system through leads.

7. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the computer control system is positioned outside the heat insulation test box.

8. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the two test piece temperature sensors are symmetrically arranged in the concrete test piece and used for accurately measuring the internal temperature of the concrete test piece.

9. The concrete adiabatic temperature rise-based autogenous volume deformation test equipment of claim 1, wherein: the two environment temperature sensors are symmetrically arranged in the concrete sample.

Technical Field

The invention belongs to the technical field of concrete buildings, and particularly relates to a self-generated volume deformation testing device based on concrete heat insulation and temperature rise.

Background

The effect of the internal exothermic properties of concrete on the structural properties of concrete is becoming increasingly important, especially in large volumes of concrete. The adiabatic temperature rise of concrete is the value of the temperature rise due to hydration of the cementitious material in the concrete under adiabatic conditions. Because the heat conduction performance of concrete is poor, the temperature rise inside the mass concrete which is continuously poured is close to the adiabatic temperature rise value of the concrete, and temperature cracks are easy to generate.

The concrete autogenous volume deformation is caused by hydration of a cementing material in the concrete, and the concrete autogenous volume deformation is easy to cause cracks to the concrete and influence the service performance of a concrete structure.

At present, the performance test of hydraulic concrete is mainly carried out according to DL/T5150-2017 hydraulic concrete test regulations, strict requirements are imposed on test conditions, the temperature of a standard curing room is controlled to be 20 +/-3 ℃, the environmental temperature of an autogenous volume deformation test is controlled to be 20 +/-2 ℃, and the temperature is greatly different from the temperature of concrete in a dam body, so that the performance of concrete autogenous volume deformation and the like measured in a laboratory cannot reflect the actual situation, the parameter setting of related structure calculation is caused to be actually inaccurate, and the reliability of structure calculation analysis is seriously influenced.

Disclosure of Invention

Aiming at the existing technical problems in the background art, the invention provides a concrete heat insulation temperature rise-based autogenous volume deformation testing device, which is used for accurately testing the heat insulation temperature rise of concrete and the autogenous volume deformation and the pH value of a pore solution under the corresponding temperature change condition.

In order to solve the technical problems, the invention adopts the following technical scheme: a self-generated volume deformation test device based on concrete heat insulation temperature rise comprises a heat insulation test box, a steel barrel, a heater, an environment temperature sensor, a test piece temperature sensor, a resistance strain gauge and a computer control system; the steel drum is installed in the heat insulation test box, a concrete sample to be measured is installed in the steel drum, and a test piece temperature sensor, a test piece pH value sensor and a resistance strain gauge are embedded in the concrete sample in the steel drum; the cavity parts of the heat insulation test box and the steel barrel are filled with liquid, and an ambient temperature sensor and a heater are arranged in the cavity parts.

Further, the environment temperature sensor, the test piece temperature sensor, the resistance strain gauge and the heater are all connected with a computer control system; the measurement of the environment temperature sensor, the test piece temperature sensor and the resistance strain gauge is displayed by the computer control system, the temperature collected by the test piece temperature sensor is transmitted to the computer control system, the temperature of the water in the environment temperature sensing collection box is transmitted to the computer control system, and the computer control system controls the heater to enable the temperature of the liquid in the cavity of the heat insulation test box and the cavity of the steel barrel to be the same as the temperature in the concrete.

Further, the bottom of the heat insulation test box is provided with a heat insulation plate, and the steel barrel is placed on the heat insulation plate at the bottom of the heat insulation test box.

And the test piece PH sensor is connected with the computer control system, and the computer control system displays the internal pH value of the concrete sample.

Furthermore, the heat insulation test box is made of heat insulation materials.

Further, the environment temperature sensor, the test piece PH sensor, the strain gauge and the heater are all connected with the computer control system through leads.

Further, the computer control system is positioned outside the heat insulation test box.

Furthermore, the two test piece temperature sensors are symmetrically arranged in the concrete test piece and used for accurately measuring the internal temperature of the concrete test piece.

Further, the two environment temperature sensors are symmetrically arranged in the concrete sample.

Compared with the prior art, the invention has the beneficial effects that:

1. the device can reflect the adiabatic temperature rise in the dam body or mass concrete and the self-generated volume deformation in the adiabatic temperature rise change process;

2. the device can simulate different construction environments and different environmental temperatures, such as the conditions of summer construction or winter construction, and is closer to the real condition of concrete autogenous volume deformation.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic diagram of the installation and placement of a test piece temperature sensor and a pH sensor;

wherein: 1-an insulation test box, 2-a heat insulation plate, 3-a steel barrel, 4-liquid, 5-a heater, 6-an environmental temperature sensor, 7-a test piece temperature sensor, 8-a pH value sensor, 9-a resistance strain gauge, 10-a computer control system and 11-a concrete sample.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

The invention will be further explained with reference to the accompanying drawings and embodiments, and the embodiment of the invention provides a concrete heat insulation temperature rise-based autogenous volume deformation testing device which comprises a heat insulation test box 1, a heat insulation plate 2, a steel barrel 3, liquid 4, a heater 5, an ambient temperature sensor 6, a test piece temperature sensor 7, a pH value sensor 8, a resistance strain gauge 9 and a computer control system 10. The steel drum 3 is arranged in the heat insulation test box 1, a concrete sample 11 to be measured is filled in the steel drum, and a test piece temperature sensor 7, a test piece pH value sensor 8 and a resistance strain gauge 9 are embedded in the concrete sample 11 in the steel drum 3; the cavity parts of the heat insulation test chamber 1 and the steel barrel 3 are filled with liquid 4, in the embodiment, the liquid 4 is selected from water, and an ambient temperature sensor 6 and a heater 5 are arranged in the liquid.

Certain preparation work is needed before the test is started; the concrete mixing materials to be tested are placed in a room 24 hours before the test, the temperature of the concrete mixing materials is enabled to be consistent with the room temperature (if special requirements are made on the pouring temperature of the mixture, the initial temperature of the mixture is controlled according to the requirements), and electronic instrument components (an ambient temperature sensor 6, a pH value sensor 7, a resistance strain gauge 9, a heater 5 and a computer control system 10) are enabled to be in a preparation working state.

The concrete mixture is filled into a steel barrel 3 (the surface of the steel barrel can be coated with butter so as to lead the concrete to fall off), and the concrete to be measured is mixed according to the standard requirement; and (3) adding water with the same temperature as the concrete mixture into the heat insulation test box 1, and covering the heat insulation test box cover.

Along with the hydration of the cementing material in the concrete, the internal temperature of the concrete gradually rises, the internal temperature of the concrete is transmitted into the computer control system 10 through the test piece temperature sensor 7 and recorded, and meanwhile, the computer control system 10 controls the heater 5 to change the temperature of water in the heat insulation test box 1, so that the temperature measured by the environment temperature sensor 6 is the same as that measured by the test piece temperature sensor 7. The concrete temperature rise is compensated, and the concrete is in a heat insulation state.

The computer control system 10 records the values of the test piece temperature sensor 7, the pH value sensor 8 and the resistance strain gauge 9 in real time, feeds back the electric signals to the computer, and draws and displays the curves of the three along with the change of time.

And obtaining the adiabatic temperature rise of the concrete and the autogenous volume deformation and the pH value of the concrete under the corresponding temperature change after the hydration of the concrete is finished.

And after the work is finished, closing all electronic instrument parts, disassembling the concrete sample, and cleaning concrete residues and water.

The working principle is as follows: the heat insulation test box is characterized in that a reliable heat insulation test environment is provided by a heat insulation test box 1, the box body is made of heat insulation materials, a bottom plate in the box body is separated from a steel barrel 3 by a heat insulation plate 2, and heat exchange between the interior of the box body and the outside is reduced to the maximum extent; the environment temperature sensor 6, the test piece temperature sensor 7 and the pH value sensor 8 are all two, and the average value is taken as a corresponding value; the concrete sample to be measured is placed in the steel barrel 3, the temperature collected by the sample temperature sensor 7 is transmitted to the computer control system 10, the temperature of the water in the box body collected by the environment temperature sensor 6 is transmitted to the computer control system 10, the computer control system 10 controls the heater 5 to enable the water temperature to be the same as the temperature in the concrete, and finally the adiabatic temperature rise of the concrete sample, the autogenous volume deformation under the corresponding temperature change and the change of the pH value along with the hydration process are measured.

The foregoing examples are provided for illustration and description of the invention only and are not intended to limit the invention to the scope of the described examples. Furthermore, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, all of which fall within the scope of the invention as claimed.