JP2937793B2 - Insulation temperature rise test equipment for concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adiabatic temperature rise test apparatus for testing a sample such as concrete with self-heating under high pressure.

[0002]

2. Description of the Related Art Conventionally, as an adiabatic temperature rise test apparatus for a sample such as mortar, concrete or the like with self-heating, for example, a specimen storage container (Japanese Utility Model Application Laid-Open No. 62-84742), which the applicant has already applied, is used. Test equipment (Japanese Unexamined Patent Publication No.
No. 105450). This test equipment is to install a thin specimen storage container containing concrete slurry and measure the temperature of concrete rising due to heat of hydration over time. Suitable for accurately measuring the ascending characteristics.

[0003] However, in recent years, construction work has been carried out to pierce the pier portion of a bridge deep in the sea. Therefore, it is required to test under such conditions, for example, concrete poured into water at a depth of about 50 m. Have been. For such a test, the amount of temperature rise of concrete or the like cast deep in the water must be determined without applying a pressure corresponding to the water depth. However, the test apparatus manufactured on the assumption of the measurement under the atmospheric pressure conditions as described above cannot satisfy the pressure conditions because the test apparatus is not manufactured to withstand high pressure.

[0004] Further, since the specimen storage container is made small in order to increase the degree of sealing of the specimen, the specimen storage container must be removed in order to take out the cured sample in the processing of the specimen after the test. Must be blown and the sample taken out,
In addition, it is necessary to separate and discard the container and sample after fusing, which is troublesome.In addition, since the sample storage container is disposable, the number of containers according to the test quantity is required, and the specimen storage that can be used under high pressure conditions Preparing the container would be too expensive, and would require too many man-hours and cost. Furthermore, since the sample container needs to be uniformly heated and needs to have a fast heating response, it is necessary to make the container outer shape a simple shape.
If the specimen storage container and the heat medium jacket are separated as separate bodies, and if a pressure-resistant container for use under high pressure conditions, the amount of heat supplied from the heat medium to the periphery of the sample becomes too large, In addition, since the controllability and the responsiveness are reduced, the followability is deteriorated, the test accuracy is deteriorated, and the device cannot be used.

[0005]

In the above-mentioned prior art, since the measurement is performed under atmospheric pressure conditions,
There is a problem that an appropriate test that satisfies the pressure condition corresponding to the water depth of the concrete poured in water cannot be performed.

An object of the present invention is to solve the above-mentioned problems in the prior art, and an object of the present invention is to provide an adiabatic temperature rise test apparatus which can perform a test even under the pressure conditions required for the depth of concrete in water. Is to do.

[0007]

According to the present invention, in order to achieve the above object, a concrete adiabatic temperature rise test apparatus according to claim 1 makes the surface temperature of a sample container follow the temperature rise inside the sample. An adiabatic temperature rise test device for a sample with self-heating that measures the self-heating value of the sample and its heating rate depending on the test environment, and for supplying a pressurized gas into a pressure-resistant sample container to pressurize the sample. A heat-insulating temperature-increasing test container in which a heat medium jacket is integrally formed with a pressure-resistant sample container to which a pressurizing device is connected is provided.

According to a second aspect of the present invention, there is provided a concrete adiabatic temperature rise test apparatus, wherein the internal shape of the pressure-resistant sample container is at least three times the maximum size of coarse aggregate contained in concrete. Is desirable.

According to a third aspect of the present invention, there is provided an apparatus for testing adiabatic temperature rise of concrete, wherein the pressure-resistant sample container has an opening on an entire surface, and the opening is formed so as to be hermetically sealed by a detachable lid. Is desirably formed in a shape monotonously enlarged from the deepest portion toward the opening.

According to a fourth aspect of the present invention, there is provided a concrete adiabatic temperature rise test apparatus, wherein the pressure-resistant sample container has a double wall structure, and a heat medium is passed between the inner and outer wall surfaces of the double wall structure. It is preferable that a jacket is formed and the jacket is detachably connected to a heat medium tank provided outside the pressure-resistant sample container via a pipe.

In addition, the concrete adiabatic temperature rise test apparatus according to claim 5 includes a sample center temperature sensor for measuring a sample center temperature, a heating medium temperature sensor for measuring a heating medium temperature in a heating medium jacket, and A first control calculating means for predicting a change in a temperature difference between the sample center temperature and the heating medium temperature based on an output signal from a temperature sensor and determining a heating medium temperature to be corrected; and A second control operation means for determining an adjustment temperature necessary for causing the heat medium temperature to follow the sample center temperature based on the corrected heat medium temperature and the heat medium temperature; It is desirable that a heat medium temperature adjusting device for adjusting the temperature be provided.

A concrete adiabatic temperature rise test apparatus according to a sixth aspect of the present invention is based on a sample center thermometer for measuring a sample center temperature, and a heat medium temperature in a heat medium jacket for measuring the sample center temperature. The correction temperature of the heat medium temperature is determined by grasping the rate of change of these temperature differences, and the control temperature of the heat medium is determined based on the correction temperature and the heat medium temperature in consideration of the rate of change of these temperature differences. A heat medium temperature controller, and a heat medium temperature controller that adjusts the temperature of the heat medium according to the output from the heat medium temperature controller, based on the sample center temperature and the heat medium temperature in the heat medium jacket, It is desirable that the temperature of the heat medium is adjusted in consideration of the temperature difference and the rate of change of the temperature difference so that the temperature of the heat medium follows the sample center temperature.

The concrete temperature rise test apparatus according to claim 7 is a PID based on a sample center thermometer for measuring a sample center temperature and a measured temperature of a heat medium in a heating medium jacket and the sample center temperature. A first PID automatic control device that executes a control operation and outputs a corrected temperature of the heat medium temperature;
A second PID automatic control device for executing a PID control operation based on a correction temperature from the first PID automatic control device and a measured temperature of the heat medium in the heat medium jacket to output a regulated temperature of the heat medium; It is preferable that a heat medium temperature adjusting device that adjusts the temperature of the heat medium according to the output from the automatic control device be provided.

[0014]

According to the structure described above, when the concrete adiabatic temperature rise test apparatus according to claim 1 is applied,
In a test environment in which the surface temperature of the sample container follows the temperature rise inside the sample, in the adiabatic temperature rise test of the sample with self-heating, which measures the self-heating value and the heat generation rate of the sample, the heat source connected to the pressure-resistant sample container The sample is pressurized by supplying a pressurized gas from the pressure device into the pressure-resistant sample container, and the temperature inside the sample is increased by the heat medium passing through the heat medium jacket formed integrally with the pressure-resistant sample container. By conducting an adiabatic temperature rise test with good thermal efficiency under high pressure conditions, it is possible to accurately measure the amount of adiabatic temperature rise of a sample that generates heat even under conditions such as concrete placing work in deep water. Become like

Further, when the concrete adiabatic temperature rise test apparatus according to claim 2 is applied, the internal shape of the pressure-resistant sample container is 3 times the maximum size of the coarse aggregate contained in the concrete.
By being twice or more, an appropriate adiabatic temperature rise test using a sample of a size that can reflect the actual structure becomes possible, and a reproducible and accurate adiabatic temperature rise amount can be obtained. become.

Further, when the concrete heat insulation temperature rise test apparatus according to the third aspect is applied, the pressure-resistant sample container is opened on the whole surface, and the opening is formed so as to be able to be hermetically closed by a detachable lid. By forming the dimension monotonically expanded from the deepest part toward the opening, the cured sample can be easily extracted,
The container can be reused, thereby improving the workability and shortening the operation time, and reducing the cost of disposing of the container and the sample, thereby reducing the test cost.

Further, when the adiabatic concrete temperature rise test apparatus according to claim 4 is applied, the pressure-resistant sample container has a double-walled structure, and a heat medium is passed between the inner and outer wall surfaces of the double-walled structure. By forming a medium jacket and detachably connected via a pipe to a heat medium tank provided outside the pressure-resistant sample container, the supplied heat medium efficiently circulates through the pressure-resistant sample container to reach the sample center temperature. The heat medium temperature can be made to follow, and the heat insulation performance is improved, and the attachment / detachment between the pressure-resistant sample container and the heat medium tank is facilitated to improve workability.

Further, when the concrete adiabatic temperature rise test device according to claim 5 is applied, the temperature of the sample center detected by the sample temperature sensor and the temperature of the heat medium in the heat medium jacket detected by the heat medium temperature sensor are determined. Based on this, the first control calculation means determines the temperature of the heat medium to be predicted and corrected for the change in the temperature difference, and the second control calculation means determines the temperature of the heat medium from the first control calculation means and the temperature in the heat medium jacket. A control temperature necessary for causing the heat medium temperature to follow the sample center temperature from the heat medium temperature is determined, and the heat medium temperature control device adjusts the temperature of the heat medium according to the obtained control temperature.

Further, when the concrete adiabatic temperature rise test apparatus according to claim 6 is applied, the temperature of the heat medium is calculated from the temperature of the sample center measured by the sample center thermometer and the measured value of the temperature of the heat medium in the heat medium jacket. The controller determines the correction temperature of the heat medium temperature by capturing the change rate of the temperature difference, and considers the change rate of the temperature difference based on the corrected temperature and the heat medium temperature in the heat medium jacket. Then, the adjusted temperature of the heat medium is determined and output, and the heat medium temperature adjusting device adjusts the temperature of the heat medium according to the determined adjusted temperature, so that the temperature between the sample center temperature and the heat medium temperature in the heat medium jacket is adjusted. The temperature of the heat medium is adjusted in consideration of the temperature difference and the rate of change of the temperature difference, and the heat medium temperature follows the sample center temperature without delay.

Further, when the concrete adiabatic temperature rise test device according to claim 7 is applied, the sample center thermometer measures the sample center temperature, and the first PID automatic control device controls the sample center temperature and the heat medium in the heat medium jacket. The PID control calculation is performed based on the measured temperature to calculate and output the corrected temperature of the heat medium temperature, and the second PID automatic controller controls the corrected temperature from the first PID automatic controller and the heat medium in the heat medium jacket. When the PID control calculation is executed based on the measured temperature to obtain and output the adjusted temperature of the heat medium, the heat medium temperature adjusting device
The temperature of the heat medium is adjusted according to the output from the PID automatic control device, and the temperature difference that changes every moment and the rate of change of the temperature difference are accurately predicted. Let me follow.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will now be described specifically with reference to the drawings. FIG. 1 is a system explanatory diagram showing the configuration of the entire apparatus in the embodiment. Here, reference numeral 10 denotes a portable test tank in which the sample container 2 containing the sample 1 is formed in a portable format, reference numeral 20 denotes a heat medium control unit that controls the temperature of the heat medium 3 supplied to the sample container 2, and reference numeral 30 denotes the sample 1 Heat medium 3 of sample container 2
And outputs a necessary control signal by measuring the temperature.

In the portable test tank 10, the sample container 2 is a double-walled container, and the heating medium jackets 4, 5 through which the heat medium 3 made of water, silicon oil, or the like passes between the walls of the double-walled container. To form The entire outer surface of the sample container 2 is covered with heat insulating materials 6 and 7. The upper surface of the sample container 2 forms a lid 8 that is removably assembled by a coupling means such as a bolt and a nut. The lid 8 also has a double wall, and a heat medium jacket through which the heat medium 3 passes between the respective wall surfaces of the lid 8. 5 and a lid 8
Is sealed with a heat insulating material 7 on the lid side after sealing the container.

The sample container 2 is provided with a sample center temperature sensor 11 for measuring the center temperature of the sample at the center of the lid 8 and a heat medium temperature sensor 12 for measuring the temperature in the heat medium jacket at the bottom. Further, the lid 8 is provided with a high-pressure pipe 13 for supplying a pressurized gas into the container, a shutoff valve 14 for stopping the supply of the supply gas, and a pressure gauge 15 for monitoring how much pressure has been applied. A high pressure gas supply source 16 such as a compressor or a cylinder is connected to the high pressure pipe 13. Further, piping 17a, 17b, 18a, 18b, 1 for supplying the heat medium 3 to the heat medium jackets 4, 5 is provided in the sample container 2.
9a and 19b are arranged, and each pipe 17a, 17b, 18
A pipe joint (not shown) is provided at an appropriate position in a, 18b, 19a, 19b to make each pipe detachable.

The heat medium control unit 20 is provided with a heat medium tank 21 for storing the heat medium 3 necessary for supplying the heat medium jackets 4 and 5 of the sample container 2. Heat medium tank 21 is pipe 2
2a and 22b, the pipe 22a is connected to the pipes 17a, 18a and 19a via the branch pipe 23a, and the pipe 22b
Are connected to the pipes 17b, 18b, 19b via the collecting pipe 23b to connect the pipes 22a, 22b from the heat medium tank 21 and the pipes 17a, 17b, 18a, 18b, 1 of the sample container 2.
9a and 19b are distributed and collected by the branch pipe 23a and the collecting pipe 23b, respectively.
The heat medium 3 is circulated in an appropriate amount.

A circulating pump 24 is connected to the heat medium tank connecting portion of the pipe 22a.
It connects to the heat medium tank 21 via 4a. Circulation pump 2
4 is a heating medium 3 whose temperature has been adjusted is supplied to a pump inlet pipe 24a.
From the pipe 22a and supplied to the pipes 17a, 18a and 19a via the branch pipe 23a to supply the heat medium 3 to each of the heat medium jackets 4 and 5 of the sample container 2, and supply the pipes 17b and 18b , 19b are returned to the heat medium tank 21 via the collecting pipe 23b and the pipe 22b, so that the heat medium 3 is circulated. An electric heater 25 and a cooling coil 26 are provided inside the heat medium tank 21, and connected to a power regulator 27 and a refrigerator 28 provided outside the tank, respectively, to form a heat medium temperature controller 29.

The control section 30 is connected to a sample center temperature sensor 11 inserted into the center of the sample container 2 to convert a measured voltage to a highly accurate sample center temperature.
1, a heating medium temperature conversion means 32 connected to a heating medium temperature sensor 12 inserted in a circulation jacket at the bottom of the sample container 2 to convert a measured voltage to a heating medium temperature, a sample center temperature conversion means 31, A first control calculating means 33 for inputting each temperature from the temperature converting means 32 to obtain and output a corrected temperature;
A second control operation means for inputting the corrected temperature from the first control operation means 33 and the heat medium temperature from the heat medium temperature conversion means 32 to obtain and output an adjusted temperature, and a control voltage corresponding to the adjusted temperature Alternatively, a manipulated variable output means 35 for obtaining a control current and outputting the manipulated variable as a manipulated variable to the heating medium temperature adjusting device 29, and a measurement voltage or a temperature of each of the measured voltages outputted from the sample center temperature converting means 31 and the heating medium temperature converting means 32 are generated. And temperature recording means 36 for recording as it is.

[Configuration of Example Apparatus] Such an adiabatic temperature rise test apparatus is a portable test tank 1 in which a test vessel 2, pipes, a pressure gauge, and the like are combined in order to facilitate actual work.
0 (FIGS. 2 to 4), a heat medium control device 50 (FIGS. 2 to 4) in which the heat medium tank 21, the heat medium temperature control device 29, and the like are combined, an instrument directly related to the control unit 30, and other instruments. Arithmetic units and the like are separately divided into a measurement control panel 60 (FIGS. 5 and 6) in which the units are detachably connected by piping or wiring.

The portable test tank 10 includes a heating medium jacket 4 and
5, a rigid tube portion made of a highly rigid material such as a stainless steel tube for the pipes 17a, 17b, 18a, 18b is protruded, and the flexible tube portion 1 of 19a, 19b is provided.
The test container 2 provided with the pipe joint 19d for connecting 9c is mounted on a carriage 42 provided with casters 41 so as to be movable. A hand-push bar 43 is provided on the carriage 42 so as to be able to be manually moved by an operator, and a guide rail 44 is laid at a position for performing a test at the test site, thereby facilitating container installation. Let

In the heat medium control device 50, the heat medium tank 21 is provided inside the housing 51 so that the upper portion of the tank is protruded, and the power regulator 27 and the refrigerator 2 provided outside the heat medium tank are provided.
Reference numeral 8 is provided in the housing. A rigid pipe portion made of a highly rigid material such as a stainless steel pipe such as the pipes 17a, 17b, 18a, and 18b is provided on the front surface (the surface on the test position side) of the housing 51 so as to project upward, and the pipes 19a and 19b are formed below. A rigid tube portion made of a material having high rigidity such as a stainless steel tube of 19b is protruded,
A plurality of sensor connectors 52 are collectively disposed at a position slightly lower than the upper pipe and having good workability. A liquid supply port 21a and a liquid discharge port 21b for supplying and discharging the heat medium project downward from the rear surface (the surface opposite to the test position side) of the housing 51. On the left side of the housing 51, a heat medium level gauge 5
3 and a refrigerator pressure gauge 28a is provided below.

The measurement control panel 60 has instruments and switches on the front panel 60a for performing operations, control, and recording necessary for measurement and control related to temperature measurement. Indicator light 61 for displaying various indications at the top of the front panel 60a
Are arranged in a line, and an FD recorder 62 for displaying measurement data on a CRT display and recording the data on a floppy disk so as to be able to analyze the data off-line is arranged at a lower central portion of the FD recorder 62.
A temperature output terminal 6 on the left side of the terminal for inputting an output signal from a temperature sensor to record and analyze raw data.
3, a time counter 64 is disposed on the right side, and a sample center thermometer 65 incorporating the sample center temperature conversion means 31 below the FD recorder 62, a heat medium temperature conversion means 32,
Heat medium temperature controller 66, heater ammeter 67 incorporating control operation means 33, second control operation means 34, and manipulated variable output means 35, for setting upper and lower limits of the heat medium temperature to prevent overrun. The lower limit cooling / upper limit overheat prevention device 68 etc. are collectively arranged, and the operation such as operation, cooling abnormality reset, heat medium supply stop, heat medium supply, etc. is performed at a position near the same height where operation is easy. Switches or push buttons 69, and FD below them.
A dot recorder 70 for recording the sample center temperature and the temperature of the heating medium at five locations of the heating medium jacket is provided as a backup or for monitoring the test when the recorder is out of order. The main switch 72 for performing the operation is disposed. On the side panel 60b, mesh-like panels 73 and 74 for ventilation are provided at the upper part and the lower part, respectively.

[Specific Description of Example Container] Details of the test container 2 will be described with reference to FIGS. The test container 2 has a size such that the inner size of the double wall is at least three times the maximum size of the coarse aggregate. In practice, in consideration of work efficiency, a plurality of test containers 2 having different sizes are prepared so that tests according to the concrete placing conditions can be performed, and the maximum inner dimension is an opening 640 mm × A container with a depth of 600 mm and a height of 660 mm is prepared. For example, in the case of testing on ordinary bridge concrete, the inner dimensions are defined as an opening 320 mm × the deepest part 300 mm × height 330 mm.
mm container shall be used.

At the upper end of the test container 2 excluding the lid 8, only the outer wall of the double wall is projected upward to form a stepped opening, and a thick plate is formed on the outer periphery of the opening formed by the outer wall. The flange 2a formed of an annular body is welded and fixed, a seal groove 2d for inserting an O-ring as a seal material 45 is formed, a plurality of bolt holes 2e are formed, a bolt 46 is inserted, and a nut is inserted. By screwing 46a, the lid 8 is formed in a shape that can be hermetically closed by bolting. The thickness of the double wall portion of the test container 2 is about 15 to 35 mm, each wall has a thickness of about 4 mm, and the ribs 2b and 2c having a height of about 7 to 27 mm separate the heat medium jacket 4 at regular intervals between the walls. Let it form. As shown in FIGS. 8 and 9, the heat medium jacket 4 divides the flow path from the bottom into two systems by ribs 2b and 2c, and connects pipes 17a, 18a to the inlets of the respective systems, and connects pipes 17b, 18b. By connecting to the outlet of each system, two heat medium flow paths are formed. At the bottom of the test container 2, a thin metal tube whose end is sealed is inserted into the inside of the heat medium jacket 4, the inserted portion is sealed, and then the heat medium temperature sensor 12 is provided inside the tube. .

[Specific Description of the Lid of the Embodiment] The lid 8 has an upper plate portion 8a made of a thick flat plate and a bakelite plate 9 for heat insulation having a plate thickness of about 4 mm inside the upper plate portion 8a. And a jacket portion 8b formed on a double wall arranged in the above manner. The thickness of the jacket portion 8b is about 46 mm and the thickness of each wall is about 4 mm.
A guide wall for the heat medium is formed by ribs 8c having a height of about 38 mm and having a height of about 38 mm, and the heat medium flows uniformly without stagnation into the jacket portion 8b having the pipes 19a and 19b as entrances and exits. The surface of the sample to be made can be made to follow the center temperature uniformly. A temperature sensor insertion hole 8d is provided at the center of the lid 8, and a sensor mounting nut 8e is fixed to the upper end of the temperature sensor insertion hole 8d by welding so that the center temperature sensor 11 can be mounted at the sample center position. I do. When the center temperature sensor 11 is mounted, the sample 1 is stored, the lid 8 is closed, and a thin metal tube having a predetermined length sealed at the end is inserted into the temperature sensor insertion hole 8d.
Then, a bolt 11a and an abacus ball-shaped sealing material (not shown) made of synthetic resin are externally fitted to the thin metal tube, and the bolt 11a is screwed into the sensor mounting nut 8e and tightened. The sealing material provided at the tip of the bolt 11a is pressed against the sensor mounting nut 8e, and the pressed sealing material is crushed to fill the gap between the temperature sensor insertion hole 8d and the inserted tube, and the temperature sensor is closed. The insertion hole 8d is sealed. In this state, the center temperature sensor 11 is provided inside a thin metal tube so that when the center temperature sensor 11 is a platinum resistance temperature detector, the pressure inside the test container does not affect the temperature measurement. ing. The same number of bolt holes 8e were formed in the peripheral portion of the lid 8 at positions corresponding to the bolt holes 2e on the test container side, and the lid 8 was fitted into the stepped opening of the test container 2 to which the sealing material 45 was attached. Occasionally bolted to allow for a tight seal.

Around the test container 2 including the lid 8, fibrous heat insulating materials 6 and 7 are packed in rectangular parallelepiped metal containers 47 a and 48 a to cover the entire test container 2 to be insulated. The maximum outer dimensions of the metal containers 47a and 48a are set to have a size having about twice the inner shape and size of the test container 2. Except for the surface on the opening side, the test container 2 excluding the lid 8 is filled with a heat insulating material 6 in a metal container 47a that covers the entire surface in a fixed manner to form a container heat insulating part 47. Since it is necessary to attach and remove the lid 8 from the container 2, the metal container 4 filled with the heat insulating material 7
The lid heat-insulating portion 48 is formed so that the lid 8a can be detachably covered from the upper plate portion 8a side.

[Specific explanation of the jacket of the embodiment] In the heating medium jacket 4 formed in the test container 2 excluding the lid 8, two flow paths of the heating medium are formed by the ribs 2b and 2c. One is that the heat medium flows in from the pipe 17a, and FIG.
In the system shown in the drawing, a right-handed spiral is drawn on the bottom surface, spirally ascending upward from the right end of the bottom surface, and flowing out of the pipe 17b from the upper right end.
A right-handed spiral is drawn on the bottom surface shown in FIG. 9, and spirally ascends upward from the left end of the bottom surface and flows out of the pipe 18b from the upper left end. In the jacket portion 8b of the lid 8,
By disposing a plurality of ribs 8c shown in FIG. 11 and equally dividing the flow path from the inlet pipe 19a to the outlet pipe 18b to the left and right, and forming the ribs 8c distributed to the left and right so as to expand outwardly. In addition, the heat medium flows through the plurality of flow paths divided according to the respective guide partition walls, while firstly averaging the flow paths from the inlet pipe 19a to the outlet pipe 18b.

[Specific description of the control unit of the embodiment] The control unit 30
Will be described in detail with reference to FIG. The sample center temperature conversion means 31 includes a linearizer 81 that linearizes the measured voltage (V1) from the sample center temperature sensor 11.
An A / D converter 82 for converting the linearized voltage from analog to digital with high precision; and a temperature for converting digital data of the measured voltage to a sample center temperature (T1) with an error of 1/100 ° C. or less. And a conversion circuit 83. The heat medium temperature conversion means 32 includes a linearizer 84 for linearizing the measured voltage (V2) from the heat medium temperature sensor 12 and an A / A converter for converting the linearized voltage from analog to digital.
It comprises a / D converter 85 and a temperature conversion circuit 86 for converting digital data of the measured voltage into a heat medium temperature (T2). The first control calculation means 33 receives appropriate temperatures (T1, T2) from the sample center temperature conversion means 31 and the heat medium temperature conversion means 32 and predicts a change in the temperature difference (Z1 = T2-T1). The circuit comprises a circuit for obtaining the correction temperature (Tx) as a control target value by the PID control method. Here, assuming that the proportional gain is K1, the integration time is I1, and the differentiation time is D1, the correction temperature Tx is calculated by the following equation. Tx = −K1 (Z1 + (1 / I1) ∫ (Z1) dt + D
1 (dZ1 / dt)) The second control calculation means 34 receives the correction temperature from the first control calculation means 33 and the heat medium temperature from the heat medium temperature conversion means 32, and receives the temperature difference (Z2 = T2- The circuit comprises a circuit for obtaining, as a control target value by the PID control method, an adjustment temperature (Ty) necessary for causing the heating medium temperature to follow the sample center temperature for which a change in Tx) is predicted. Proportional gain K2, integration time I
Assuming that the differential time is D2, the regulated temperature Ty is calculated by the following equation. Ty = −K2 (Z2 + (1 / I2) ∫ (Z2) dt + D
2 (dZ2 / dt)) The manipulated variable output means 35 includes: a manipulated variable output circuit 87 that calculates and outputs an operation voltage (Y) corresponding to the regulated temperature (Ty) calculated by the second control calculation means 34; An A / D converter 88 which converts the operation voltage from digital to analog and outputs the control voltage (Vc) to the heating medium temperature controller 29. Thereby, the temperature control of the heat medium is performed by setting the PID control constant by the first control operation means 33 and the second control operation means 34.
By performing the above-described synthesis control, not only the change rate of the sample center temperature but also the heat medium 3 can be set.
By setting the manipulated variable that also predicts the rate of change of the heat medium temperature taking into account the heat capacity of the controller, effectively reduce the manipulated variable that tends to be large by a single control, and stabilize the response to deviation quickly. To do. The temperature recording means 36 includes an FD recorder 62 as a magnetic recording device and a dot recorder 70 as an automatic temperature recorder.
The analog data transmitted from 12 is recorded in the FD recorder 62 at a predetermined recording density as it is, so that the data can be analyzed off-line. In addition, as a backup, the dot data recorder 70 causes analog data to be printed on the recording paper at arbitrary time intervals (pen writing), and when the data cannot be analyzed from the FD recording, the data is read from the recording paper and the test result is read. Enable analysis.

[Operation of the embodiment] In the embodiment configured as described above, after the test, the pipes 17a, 18a, 19
a and the pipe joints of the pipes 17b, 18b, and 19b are removed, the portable test tank 10 is moved to a place where the concrete slurry is discarded, the lid 8 is opened, and the test container 2 is turned upside down to discharge the cured sample. Thereafter, the portable test tank 10 is moved to a container washing place to wash the inside of the container. By doing so, the test can be easily prepared for the next test simply by pouring the concrete slurry into the test container 2.

At the time of the test, the portable test tank 10 is moved to a place for containing the concrete slurry, the concrete slurry is poured into the test container 2, the lid 8 is closed, and the bolt 4
6 and the nut 46a, and then cover the heat insulating portion 48 to insulate the entire test container 2, move to the installation location of the heat medium control unit 50, guide the caster 41 to the guide rail 44, and move the caster 41 to a predetermined position. After fixing, connecting the pipe joints of the pipes 17a, 18a, 19a and pipes 17b, 18b, 19b to supply the heat medium 3, connecting the high-pressure pipe 13 and pressurizing at a predetermined pressure, then closing the shut-off valve 14 The pressure in the container is kept constant to complete the test preparation.

In parallel with the preparation for the test, the person in charge of the measurement control panel 60 turns on the main switch 72 and sets the heat medium temperature controller 66, the heater ammeter 67, the lower limit cooling / upper limit overheat prevention device 68 and the like. The switch or the push button 69 is turned on in accordance with the preparation state of the test so that each instrument is activated and necessary data recording and control can be performed. As the test progresses, the status of the test is monitored by the display of the FD recorder 62 and the dot recorder 70 as necessary.

Then, the temperature of the heat medium is automatically controlled by the control unit 30, and the temperature of the heat medium follows the sample center temperature. That is, an output voltage (V1) corresponding to the sample center temperature measured by the sample center temperature sensor 11 is input to the sample center temperature conversion means 31 to obtain a digitized high-precision sample center temperature (T1). An output voltage (V2) corresponding to the heat medium temperature measured by the medium temperature sensor 12 is input to the heat medium temperature conversion means 32, and the heat medium temperature (T2) digitized.
And the respective output voltages (V1, V2)
Is recorded in the temperature recording means 36 as the measured temperature data, and the sample center temperature (T1) from the sample center temperature conversion means 31 and the heat medium temperature (T
2) is input to the first control calculation means 33, and a correction temperature (Tx) required for the temperature of the heat medium 3 to follow the sample center temperature without delay is obtained based on these data. The corrected temperature (Tx) and the heating medium temperature (T2) are input to the second control calculating means 34, and the temperature (Ty) to be adjusted is obtained based on these data. The operation voltage (Y) corresponding to (Ty) is obtained, and is converted from digital to analog and output as a control voltage (Vc) to the heat medium temperature control device 29. Is controlled so as to follow the sample center temperature. After the correction temperature (Tx) is obtained by predicting such a change in the temperature difference between the sample center temperature and the heat medium temperature, the sample center temperature at which the initial temperature change is fast is determined based on the correction temperature (Tx) and the heat medium temperature. In the case of a method in which the temperature to be adjusted at a time is determined by adopting a two-step setting method in which the control temperature (Ty) is determined in consideration of the respective temperature change rates of the heat medium temperature and the heat medium temperature having a large temperature change. In contrast to the above, even if the control target value to be initially set is large, the control target value can be sequentially corrected and effectively reduced, so that the operation amount is controlled in a direction to quickly converge, and It becomes possible to respond so that the control based on the deviation of the temperature data is rapidly stabilized.

[Test of Example] FIG. 13 shows the result of a test performed by using the pressurized test apparatus configured as described above, together with the result of a test performed by the conventional apparatus using the same sample without pressing. As a result, the test using the pressurized test apparatus has a higher temperature rise amount, and shows that the heat is quickly transferred to the sample without a delay around the sample container when the sample temperature is rapidly increased. Thereby, even if the sample temperature changes rapidly under high pressure, the apparatus of the present embodiment can quickly follow the temperature of the heating medium to the sample center temperature to maintain an adiabatic state. The test performance could be improved.

[Effects of Embodiment] As described above, in the embodiment,
By integrating the previously separated sample container and the heat medium jacket into an integrated structure, it is possible to realize a sample container for a heat-insulated temperature rise test with high thermal efficiency that can perform high-pressure tests. The temperature rise test can be executed with high accuracy. In addition, by increasing the opening of the sample container and tapering the inside to uniformly reduce the diameter, the cured sample can be easily extracted and the container can be reused, improving workability. As a result, the working time can be shortened, the cost for disposing of the container and the sample can be reduced, and the test cost can be reduced.

[0043]

As described above, in the concrete adiabatic temperature rise test apparatus according to the first aspect of the present invention, a pressurizing device for supplying a pressurized gas into the pressure-resistant sample container to pressurize the sample is connected. By providing an adiabatic temperature rise test container in which a heat medium jacket is formed integrally with the pressure-resistant sample container, the sample can be directly pressurized by supplying a pressurized gas into the pressure-resistant sample container. Adiabatic temperature rise test with good thermal efficiency can be performed under the conditions, and the amount of adiabatic temperature rise of a sample that self-heats can be accurately measured even under conditions such as concrete placing work in a deep water depth.

According to the second aspect of the present invention, the internal structure of the pressure-resistant sample container is set to be at least three times the maximum size of the coarse aggregate contained in the concrete. A suitable adiabatic temperature rise test using a sample of a size that can reflect the above can be performed, and a reproducible and accurate adiabatic temperature rise amount can be obtained.

Further, in the concrete adiabatic temperature rise test apparatus according to the third aspect, the pressure-resistant sample container has an entire opening on one side, and the opening is formed to be hermetically sealed by a detachable lid. Forming the shape monotonically enlarged from the deepest part toward the opening allows the cured sample to be easily extracted, the container to be reused, and the workability to be improved. In addition, the operation time can be shortened, the cost for disposing of the container and the sample can be reduced, and the test cost can be reduced.

Further, in the apparatus for testing adiabatic temperature rise of concrete according to claim 4, the pressure-resistant sample container has a double wall structure, and a heat medium jacket for allowing a heat medium to pass between the inner and outer wall surfaces of the double wall structure. Is formed, and is detachably connected via a pipe to a heat medium tank provided outside the pressure-resistant sample container, so that the supplied heat medium efficiently circulates through the pressure-resistant sample container and reaches a central temperature of the sample. The temperature can be made to follow, the heat insulation performance can be improved, and the attachment and detachment between the pressure-resistant sample container and the heat medium tank can be facilitated to improve the workability.

Further, in the concrete adiabatic temperature rise test apparatus according to the fifth aspect, based on the sample center temperature detected by the sample center temperature sensor and the heat medium temperature in the heat medium jacket detected by the heat medium temperature sensor, The first control calculating means determines the temperature of the heat medium to be corrected by predicting the change in the temperature difference, and the second control calculating means determines the temperature of the heat medium from the first control calculating means and the heat medium in the heat medium jacket. From the temperature, the control temperature necessary to make the heat medium temperature follow the sample center temperature is determined, and the heat medium temperature control device adjusts the temperature of the heat medium according to the obtained control temperature. Set the manipulated variable in consideration of the change in the center temperature and the change in the temperature of the heat medium having a large heat capacity, and effectively reduce the regulated temperature that tends to increase when the manipulated variable is set only in consideration of the change in the sample center temperature. thing The adiabatic temperature rise in the region where the temperature change caused by the heat of hydration reaction of concrete is large, and the adiabatic temperature rise in the region where the temperature change is small due to the progress of hardening. Both can be measured accurately.

Further, in the concrete adiabatic temperature rise test apparatus according to the present invention, the heat medium temperature controller uses the sample center temperature measured by the sample center thermometer and the measured value of the heat medium temperature in the heat medium jacket. Determines the correction temperature of the heat medium temperature by capturing the rate of change of the temperature difference, and based on the corrected temperature and the temperature of the heat medium in the heat medium jacket, considers the rate of change of these temperature differences and determines the heat. Determine and output the adjusted temperature of the medium,
The heat medium temperature controller adjusts the temperature of the heat medium according to the control temperature determined by the heat medium temperature controller, so that the temperature of the heat medium based on the sample center temperature and the heat medium temperature in the heat medium jacket is adjusted. The temperature can be adjusted quickly and accurately, and the temperature of the heating medium can follow the sample center temperature quickly and stably in both the large temperature change area and the small temperature change area. Ascending test conditions can be obtained.

[0049] In the apparatus for testing adiabatic temperature rise of concrete according to claim 7, the sample center thermometer measures the sample center temperature, and the first PID automatic controller controls the measured temperature of the heat medium in the heat medium jacket and the sample temperature. PI based on center temperature
The second PID automatic controller performs a P control operation based on the corrected temperature from the first PID automatic controller and the measured temperature of the heat medium in the heat medium jacket. When the control operation is executed to obtain and output the adjusted temperature of the heat medium, the heat medium temperature adjusting device
D By adjusting the temperature of the heat medium in accordance with the output from the automatic controller, the temperature difference that changes every moment and the rate of change of the temperature difference are accurately predicted, and the heat is adjusted to the sample center temperature. The medium temperature can be made to follow with high accuracy, and the temperature can be stably and accurately controlled in both the region where the temperature change is large and the region where the temperature change is small in the adiabatic temperature rise test. In addition, since two PID automatic adjustment devices are connected in series, a control device that can accurately follow the temperature of the heating medium to the sample center temperature can be manufactured inexpensively and simply.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an adiabatic temperature rise test apparatus according to the present invention.

FIG. 2 is a side view showing a portable test tank and a heat medium control device of the embodiment.

FIG. 3 is a front view showing a portable test tank and a heat medium control device of the embodiment.

FIG. 4 is a plan view showing a portable test tank and a heat medium control device of the embodiment.

FIG. 5 is a front view showing a measurement control panel of the embodiment.

FIG. 6 is a side view showing the measurement control panel of the embodiment.

FIG. 7 is a longitudinal sectional view showing a test container of an example.

FIG. 8 is an explanatory side sectional view showing a heat medium jacket of the test container of the example.

FIG. 9 is an explanatory bottom sectional view showing a heat medium jacket of the test container of the example.

FIG. 10 is an explanatory side sectional view showing a heat medium jacket of the lid of the embodiment.

FIG. 11 is an explanatory bottom sectional view showing a heat medium jacket of a lid according to an embodiment.

FIG. 12 is a block diagram illustrating a control unit according to the embodiment.

FIG. 13 is a graph showing the results of an adiabatic temperature rise test performed using the example apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Sample 2 Sample container 3 Heat medium 4, 5 Heat medium jacket 6, 7 Heat insulation material 8 Lid 10 Portable test tank 11 Sample center temperature sensor 12 Heat medium temperature sensor 13 High pressure piping 14 Shut-off valve 15 Pressure gauge 16 Gas supply source 17a , 17b, 18a, 18b, 19a, 19b Pipe 20 Heat medium control unit 21 Heat medium tank 22a, 22b Pipe 23a Branch pipe 23b Collecting pipe 24 Circulation pump 25 Electric heater 26 Cooling coil 27 Power regulator 28 Refrigerator 29 Heat medium temperature Control device 30 Control unit 31 Sample center temperature conversion means 32 Heat medium temperature conversion means 33 First control calculation means 34 Second control calculation means 35 Operation amount output means 36 Temperature recording means 50 Heat medium control device 60 Measurement control panel

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shuji Yoshikawa 585 Tomicho, Funabashi-shi, Chiba Sumitomo Osaka Cement Co., Ltd. (72) Inventor Tohru Nagasokabe 585 Tomimachi, Funabashi-shi, Chiba Sumitomo Osaka Cement Co., Ltd. (56) References JP-A-63-187145 (JP, A) JP-A-6-18457 (JP, A) JP-B-6-41927 (JP, B2) (58) Fields surveyed (Int .Cl. ⁶ , DB name) G01N 25/00-25/72

Claims (7)

(57) [Claims] By 1. A test environment that has to follow the sample container surface temperature to the temperature rise within the sample, a adiabatic temperature rise test device of the sample with a self-heating of measuring the self-heating amount and the heat generation rate of the sample, A pressurized gas is supplied into the pressure-resistant sample container to pressurize the sample.
The adiabatic temperature rise test device of the concrete, characterized in that it comprises an adiabatic temperature rise test container is formed integrally with a heat medium jacket into a pressure sample vessel where the pressure device is connected in order. 2. The adiabatic temperature rise test system for concrete according to claim 1, wherein the internal shape of the pressure-resistant sample container is at least three times the maximum size of the coarse aggregate contained in the concrete . Wherein the pressure-resistant sample container is opened the whole of one side, the opening sealably formed by a detachable lid, monotonously to expand the container shape dimension toward the opening from the deepest shape 2. The core according to claim 1 , wherein
Concrete insulation temperature rise test equipment. Wherein said pressure-resistant sample container has a double wall structure, the
A heat medium jacket for allowing a heat medium to pass between the inner and outer wall surfaces of the double-wall structure is formed, and is detachably connected to a heat medium tank provided outside the pressure-resistant sample container via a pipe. Item 2. An apparatus for testing heat insulation temperature rise of concrete according to item 1. The sample center temperature sensor for measuring the 5. specimen center temperature, the heat transfer medium temperature sensor for measuring the temperature of the heating medium in the heat medium jacket, the said sample center temperature based on an output signal from the temperature sensor First control calculating means for determining a heat medium temperature to be predicted and corrected for a change in a temperature difference from the heat medium temperature;
A second control operation means for determining an adjustment temperature necessary for causing the heat medium temperature to follow the sample center temperature based on the corrected heat medium temperature from the first control operation means and the heat medium temperature;
A heating medium temperature adjusting device for adjusting the temperature of the heating medium according to an output of the control calculation means .
5. The test device for increasing the heat insulation temperature of concrete according to any one of 4 . 6. specimen center and the sample center thermometer for measuring the temperature, by measuring the temperature of the heating medium in the heat medium jacket on the basis of said sample center temperature captures the rate of change of these temperature differences the heat transfer medium temperature A heat medium temperature controller that determines a correction temperature of the heat medium and determines a control temperature of the heat medium based on the correction temperature and the heat medium temperature, taking into account the rate of change of the temperature difference; and the heat medium temperature controller. And a heating medium temperature controller for adjusting the temperature of the heating medium according to the output from the apparatus, based on the sample center temperature and the heating medium temperature in the heating medium jacket, taking into account the temperature difference and the rate of change of the temperature difference, The concrete temperature rise test apparatus according to any one of claims 1 to 4, wherein the temperature of the heat medium is made to follow the sample center temperature by adjusting the temperature of the heat medium. 7. A specimen center and the sample center thermometer for measuring the temperature, compensation temperature based on the measured constant temperature of the heat medium in the heat medium jacket and the sample center temperature is running PID control operation the heating medium temperature A first PID automatic control device for outputting
A first 2PID automatic control device for outputting a regulated temperature correction temperature and the measured constant temperature of the heat medium by performing PID control operation based on the heating medium in the heating medium jacket from the PID automatic control device, said 2PID automatic Conch according to claim 1, characterized in that a heating medium temperature adjusting device for adjusting the temperature of the heating medium in accordance with the output from the control device
REIT adiabatic temperature rise test equipment.