JPH0650292B2 - Adiabatic temperature rise test device for samples with self-heating - Google Patents

Description

TECHNICAL FIELD The present invention relates to an adiabatic temperature rise test apparatus for a sample such as concrete and mortar which is accompanied by self-heating, and particularly, as a sample stored in a test tank. The heat medium temperature is controlled so that the surface temperature of the heat medium jacket follows the temperature rise due to the hydration reaction of concrete or mortar, and the sample in the test tank is kept in an adiabatic state, and the adiabatic temperature rise of the sample accompanied by self-heating A device for measuring quantity.

[Conventional technology]

BACKGROUND ART Conventionally, a sample adiabatic temperature rise test device using concrete and mortar as a sample has been widely used in order to confirm the situation of placing concrete or mortar at a construction site. That is, concrete or the like is formed in the test apparatus with the same composition as the actual composition at the construction site, and the adiabatic temperature test is performed.

As an adiabatic temperature rise test device for such a sample, there is a conventional device as shown in FIG. 6, for example. In this figure,
1 has a square cross section and has an insulating material 1 on the inner surface.
A storage container made of stainless steel in which a is arranged, 2 is a cork buffer container formed in a cylindrical shape, and concrete 3 as a sample sealed in a test tank 8 is provided in the buffer container 2.
Is stored. A heater 4 is arranged on the side and the lower side of the buffer container 2, and the operation is controlled by a temperature controller 5. Further, a concrete thermometer 6a is inserted and arranged in the concrete 3 stored in the test tank 8 and a tank thermometer 6b is attached inside the storage container 1, and the concrete thermometer 6a The in-bath thermometer 6b is connected to the temperature controller 5 and the temperature recorder 7.

Therefore, when the water in the mortar or concrete reacts with the cement in the test tank 8 and heat of hydration reaction is generated, the temperature inside the containment vessel 1 becomes substantially the same as the temperature inside the test tank 8. The heater 4 operates to heat. That is, the adiabatic temperature of the sample in the state where the heater 4 operates in a manner that follows the change in the temperature rise of the sample in the test tank 8 and the temperature inside the test tank 8 and the temperature inside the storage container 1 are kept substantially the same. The amount of rise is measured.

[Problems to be solved by the invention]

By the way, in such a conventional adiabatic temperature rise test apparatus, the test tank is covered with a cushioning material such as cork in order to prevent heat from flowing out from the sample stored inside. However, since this cushioning material plays a role as a heat insulating material, there is a time lag between the temperature rise in the test tank and the temperature rise in the containment vessel even when heated by a heater. Occurs, and heat flows out from the sample in the test tank during the time lag, which makes it impossible to perform an appropriate adiabatic temperature rise test.

Therefore, an object of the present invention is to eliminate the temperature difference between the center temperature of the sample and the external evaluation surface of the sample and maintain the heat insulating state.

[Means for solving problems]

The applicant of the present application has already made it possible to match the central temperature of the concrete or mortar in the test tank with the heating medium jacket temperature by the patent application dated July 11, 1985 (Japanese Patent Application No. 151366 of 1985). However, the present patent application is filed in order to solve the problems and achieve the problems. Further, the present invention provides a sample (1) made of admixed concrete as an adiabatic temperature rise test device for a sample accompanied by self-heating.
5) is housed in the test tank (16), the test phase (16) is housed in the storage container (10) in a removable manner, and the surface temperature of the test tank follows the temperature rise inside the sample by the control unit (11). In the device for adiabatic temperature rise test of a sample accompanied by self-heating, which measures the self-heating value of the sample (15) and its heating rate while controlling the temperature of the test environment as described above, the storage container (10) is provided in plural. If the test tank (1
6) a container for enclosing and storing 6) is formed, and a divided lower end is formed on a movable carriage (12), and a heat insulating material is provided on the inner surface of the container for each divided portion of the storage container (10). (13) is lined, and the heat medium circulating flow paths (30 to 32, 4) are arranged inside the heat insulating material (13) so as to closely contact the outer surface of the test tank (16) and circulate the temperature controlled heat medium.
5, 46, 51) and a heating medium jacket (14) is formed, and the heating medium circulating channel (3) is formed in the control unit (11).
0 to 32 or 45, 46, 51) and a heat medium supply system (60) provided with a heat circulation means (59) for circulating the temperature-controlled heat medium at high speed and a heat medium tank (58) for storing the heat medium. , 70) are connected.

In this case, it is desirable to use water or silicone oil as the heat medium.

Further, in this case, it is desirable that the surface of the heat medium jacket (14) that is in close contact with the outer surface of the test tank (16) be mirror-finished.

Furthermore, in this case, as the heat medium jacket (14), a heat medium circulating flow path (30 to 3) having a pipe structure is used.
2) or channels (45, 4) divided by partition walls
It is desirable to have the heat medium circulating flow paths (30 to 32) in which the heat transfer medium (6, 51) is formed.

[Action]

According to the present invention, after the storage container (10) is assembled, the test tank (16) accommodating the sample (15) with self-heating is
It is in close contact with the heat medium jacket (14) formed on the inner surface of the assembled containment vessel (10), and the outer surface of the test tank is covered with the heat medium circulating flow paths (30 to 32 or 45, 46, 51), When the controlled heat medium is circulated at high speed between the heat medium tank (58) and the heat medium circulating flow paths (30 to 32 or 45, 46, 51) by the heat medium circulation means (59), the sample center temperature The surface temperature of the test tank (16) accurately follows the sample, and the sample (15) stored in the test tank (16)
The sample center temperature and the sample surface temperature are kept constant, and the temperature that reflects the temperature change due to self-heating is measured.

When the containment vessel (10) is disassembled, the heat medium jacket (14) has an independent heat medium circulating flow path (30) for each divided portion.
.., 32, 45, 46, 51) are formed, disassembly becomes easy, and the test tank (16) can be moved while the test container (16) is placed on the lower end of the storage container (10). The sample stored in the test tank (16) can be easily prepared and replaced, the sample temperature can be measured in a short preparation work, the initial temperature change of the sample (15) can be easily estimated, and the adiabatic temperature can be improved. Improve the measurement accuracy of the rise test.

Therefore, in the concrete material that self-heats due to the hydration reaction between cement and water, the rate of the hydration reaction, that is, the heat generation rate, changes with the passage of time, and the ratio of free water and bound water also changes. Therefore, the specific heat itself also changes, and since self-heating continues in the presence of water, it changes within the engineering permissible range from the time when the amount of self-heating is large and the temperature changes rapidly. The adiabatic temperature rise amount can be accurately measured for a long period until the amount converges and the temperature change becomes negligibly small.

Example of Invention

Hereinafter, the present invention will be described based on the embodiments shown in the accompanying drawings.

As shown in FIG. 2, the sample adiabatic temperature rise test apparatus 9 according to the present embodiment includes a storage container 10 and a control unit 11, and the storage container 10 is installed on a trolley 12 that is movably formed. Has been done. The storage container 10 is formed in a substantially rectangular parallelepiped shape, and includes a heat insulating material 13 made of a material such as glass wool having a high heat insulating property and a heat medium jacket 14 having a plurality of heat medium paths through which the heat medium flows. A cylindrical test tank 16 in which concrete 15 as a sample is housed is arranged inside the heating medium in close contact with the heating medium jacket 14. Further, the storage container 10 including the heat insulating material 13 and the heat medium jacket 14 is formed so that the top surface portion 10d and the side surface portion 10e can be split into two parts in the width direction except for the bottom surface portion 10c. That is, hinge parts 17 and 18 are attached to the back surface part 10a of the storage container 10 at two places, and the hinge rod 19 is inserted into these hinge parts 17 and 18, while the storage container 10 is provided. Two handles 20 and a lock device 21 are attached to the front portion 10b of the.
Therefore, the storage container 10 can be rotated leftward and rightward about the hinge rod 19 to be divided into two. The sample adiabatic temperature rise test apparatus 9 according to the present embodiment uses, for example, water (or silicon oil) as a heat medium, and as shown in FIGS.
1, a water supply pipe 22 and a drain pipe 23 extend from the storage container 10 to the heat medium jacket 14 provided in the storage container 10 via connecting portions 22a and 23a, respectively. Further, the temperature of the heat medium water is controlled by the controller 11 so as to follow the surface temperature of the test tank 16. Incidentally, FIG. 4 shows an outline of a water supply / drainage system for the heating medium jacket 14. In the figure, the solid line 60 indicates the water supply route, and the broken line 70 indicates the drainage route. Water as a heat medium is stored in the heat medium tank 58, enters the heat medium jacket 14 through the water supply path 60 via the pump 59, and drains 70
It is controlled so as to exit from and return to the heat medium tank 58.

The heat medium jacket 14 has heat medium circulation pipes 30 to 32 as heat medium paths that tightly cover the outer surface of the test tank 16 as shown in FIGS. The first heat medium circulation pipe 30 is disposed on the upper surface of the test tank 16 and is intended to insulate the upper surface. For example, as shown in FIG. 1 (a), it is formed in a meandering shape. It The second heat medium circulation pipe 31 is an annular pipe 31a arranged on the outer periphery of the upper end of the test tank 16 as shown in FIGS. 1 (a) and 1 (b).
And the annular pipe 3 arranged on the outer periphery of the lower end of the test tank 16.
1b and these annular pipes 31a arranged above and below,
A plurality of connecting pipes 31c for connecting 31b at substantially equal intervals
It consists of and. The second heat medium circulation pipe 31 serves to insulate the outer surface of the side portion of the test tank 16, for example, water as a heat medium is supplied from one end of the upper annular pipe 31a, and the connecting pipe 31c is omitted. Water is evenly distributed so that water is collected from one end of the lower annular pipe 31b. The diameter of the connecting pipe 31c is about 8 mm, and the center interval is about 3 mm.
It is preferably 0 mm or less. Third heat medium circulation pipe 3
2 is arranged on the lower surface of the test tank 16 to insulate the lower surface, and as shown in FIGS. 1 (c) and 1 (d), a water supply pipe 32a, a water collecting side pipe 32b and those. A plurality of connecting pipes 32 for connecting both pipes at substantially equal intervals
formed by c. This third heat medium circulation pipe 32
The connecting pipe 32c of is also the same as the connecting pipe 31c.
It is preferable that the diameter is about 8 mm and the center interval is 30 mm or less. In addition, these heat medium circulation pipes 30 to 3
As the material of No. 2, copper or the like, which has high workability and good thermal conductivity, is suitable. Further, if the inner surface of the heating medium jacket 14 facing the test tank 16 is made of stainless steel and has a mirror-finished surface, the conduction effect due to the radiation can be enhanced. In FIG. 2, reference numeral 24 is a lift hook for lifting the storage container 10, and reference numeral 25 is a lever used for lifting the storage container 10. On the other hand, the control unit 11
Reference numeral 2 is used to control the temperature inside the storage container 10 and record the temperature rise of the concrete 15 as a sample.
Reference numeral 6 is a temperature recorder, and reference numeral 27 is a temperature controller.

When performing an adiabatic temperature test using the adiabatic temperature rise test device 9 configured as described above, the lever 25 is pulled and the storage container 10 is lifted on the dolly 12 by the lift hook 24, and the lever 25 is fixed and stored. The state in which the container 10 is lifted is maintained.

Next, the lock device 21 attached to the front portion 10b of the storage container 10 is released, and the handle 20 is used to remove the storage device 10 from the storage container 10.
Is divided into two in the left-right direction. Then, the test tank 16 accommodating the sample is installed in the heating medium jacket 14, and the storage container 10 is closed and locked again. Then, the lever 25 is tilted to lower the storage container 10 onto the dolly 12, and the test is performed.

The adiabatic temperature rise test apparatus for a sample according to this example is provided with the first, second, and third heat medium circulation pipes 30, 31, and 32 in the heat medium jacket 14, and the outer surface of the test tank 16 is closely packed. Since it is covered with the heat medium circulation pipes 30 to 32, the sample center temperature and the sample surface temperature can always be made constant, and a heat insulating state can be secured.

FIGS. 3 (a) to 3 (e) show an example of another heat medium jacket according to the present invention. In the heat medium jacket 40 according to this embodiment, the heat medium circulation path is formed by a partition wall made of stainless steel.

In these figures, 41 is a water supply pipe for supplying water as a heat medium, 42 is a lower end of the water supply pipe 41,
An annular pipe arranged annularly along the outer peripheral portion of the test tank 16, 43 is a dispersion pipe connected so that the water from the annular pipe 42 is dispersed in a predetermined number of areas, and 44 is the dispersion pipe 43. Is a connecting pipe for guiding the water in the direction toward the outer surface of the test tank 16. Reference numeral 45 denotes a side heat medium passage formed on the outer side surface of the test tank 16 so that water as a heat medium passes therethrough. The side heat medium passage 45 is connected to the test tank 16 and the heat insulating material 13.
The partition wall 4 in which the space provided between and is formed of stainless steel or the like.
It is formed by dividing the predetermined area by 7 (for example, 24 sections). Further, on the outer surface of the upper part of the test tank 16,
An upper heat medium passage 46 is formed which is connected to the upper end of the side heat medium passage 45. The upper heat medium passage 46 is also divided into the same number of areas as the side heat medium passages 45 by a partition wall 47 made of stainless steel or the like so that a uniform temperature distribution can be obtained. The partition wall 47 is arranged so as to be focused on the water collecting pipe 48 at the center of the upper surface of the test tank 16.

FIGS. 3D and 3E show the bottom of the heating medium jacket 40. In the figure, 50 is a water supply pipe for supplying water as a heat medium, 51 is a bottom heat medium path divided into a predetermined number of areas by partition walls 52 such as stainless steel, 53 is a water collecting pipe, 54 is an end portion of the partition walls 52. It is a current plate provided in the.

Therefore, according to such a configuration, the water supplied from the water supply pipes 41, 50 has the side heat medium passage 45 and the upper heat medium passage 4
6. Since it flows through the bottom heat medium passage 51, the entire outer surface of the test tank 16 is exposed to the heat medium (water), and the heat insulating effect is further enhanced. The partition walls of the heating medium paths 45, 46, 51 are preferably 100 to 150 mm or less, but are not limited to this as long as a uniform heating medium temperature distribution can be obtained. The pipe or partition wall of the concrete or mortar that does not face the sample container is covered with glass wool or the like having good heat insulating properties. Its thickness should be at least 15 cm.
The amount of water to be circulated is determined so that the difference in water temperature between the inlet and the outlet is within 0.2 ° C, but it is necessary to be about 200 to 300 / min.

FIG. 5 shows an example using the adiabatic temperature rise test apparatus according to the present invention, and shows the measurement results of the deviation between the surface temperature of the test container and the center temperature of the sample. From this measurement result, it was confirmed that the difference between the surface temperature of the test container and the center temperature of the sample was within 0.2 ° C. at the maximum, and it was confirmed that a sufficient heat insulating effect was obtained.

〔The invention's effect〕

As described above, in the sample adiabatic temperature rise test apparatus according to the present invention, after the storage container (10) is assembled, the test tank (16) accommodating the sample (15) accompanied by self-heating is installed in the storage container. The temperature is controlled by closely contacting the heat medium jacket (14) formed on the inner surface of the container (10) and by covering the outer surface of the test tank with the heat medium circulating flow paths (30 to 32 or 45, 46, 51). The medium is circulated by the heat medium circulating means (59) and the heat medium tank (58) and the heat medium circulating channel (30 to 32 or 4).
5, 46, 51), the surface temperature of the test tank (16) accurately follows the sample center temperature and is stored in the test tank (16). In the sample (15), the sample center temperature and the sample surface temperature are kept constant, the adiabatic state can be maintained, and the temperature accurately reflecting the temperature change due to self-heating can be measured.

Further, when the containment vessel (10) is disassembled, independent heat medium circulation channels (30 to 32, 45, 46, 51) are formed as the heat medium jacket (14) for each of the divided portions, so that the containment vessel is formed. (10) can be easily disassembled and divided, and the test vessel (1
By allowing 6) to be moved while being placed, the large sample stored in the test tank (16) can be easily prepared and replaced, and the sample temperature can be measured in a short time. The initial temperature change of (15) can be easily estimated,
The measurement accuracy of the adiabatic temperature rise test can be improved.

Therefore, the concrete material that self-heats has the peculiarity that the specific heat itself also changes because the rate of hydration reaction, that is, the heat generation rate, changes with the passage of time and the ratio of free water and bound water changes. Also, even though the material self-heats continuously in the presence of water and the temperature changes for a long period of time, the amount of change is within the engineering allowable range from the time when the amount of self-heating is large and the temperature changes quickly. The adiabatic temperature rise amount can be accurately measured during a long period until the temperature converges and the temperature change becomes negligibly small.

[Brief description of drawings]

FIGS. 1 (a) to 1 (c) show an example of a storage container according to the present invention. The upper surface portion, side development view, and bottom view of the heat medium circulation pipe are shown in FIG. 1 (d), respectively. FIG. 2 (a) is a side view showing a sample adiabatic temperature rise test apparatus according to the present invention, and FIG. 2 (b) is a front view thereof.
FIG. 3C is a cutaway top view of the same part, FIG. 3A is a plan view showing another example of the storage container according to the present invention, and FIG.
FIG. 3A is a cross-sectional view taken along the line bb of FIG. 3A, and FIG. 3C is a development view of a side heat medium passage provided in the storage container shown in FIG.
FIG. 3 (d) is a view showing a bottom heat medium passage provided in the storage container shown in FIG. 3 (a), and FIG. 3 (e) is e in FIG. 3 (d).
-E line cross-sectional view, FIG. 4 is a diagram showing an example of a water supply / drainage path of the present invention, FIG. 5 is a graph showing an experimental example using a sample adiabatic temperature rise test apparatus according to the present invention, and FIG. It is a whole block diagram which shows an example of the adiabatic temperature rise test apparatus of FIG. 9 …… Sample adiabatic temperature rise tester 10 …… Containment vessel 11 …… Control section 13 …… Insulation material 14 …… Heat medium jacket 15 …… Concrete 16 …… Test tank 22 …… Water supply pipe 26 …… Temperature record Total 27 ...... Temperature adjuster 30 to 32 ...... Heat medium circulation pipe (heat medium circulating flow path) 31a, 31b ...... annular pipe 31c ...... Connection pipe 32a ...... Water supply pipe 32b ...... Water collection pipe 32c ...... Connection Pipe 40 …… Heat medium jacket 41 …… Water supply pipe 42 …… Annular pipe 43 …… Dispersion pipe 44 …… Connection pipe 45 …… Side heat medium passage (heat medium circulating flow path) 46 …… Upper heat medium path (Heat medium circulating flow path) 47 ... Partition wall 48 ... Water collecting pipe 50 ... Water supply pipe 51 ... Bottom heat medium path (heat medium circulating flow path) 52 ... Partition wall 53 ... Water collecting pipe 58 ... Heat Medium tank 59 ... Pump (heat Circulation means) 60 ...... water supply channel (heat medium supply system) 70 ...... drainage path (heat medium supply system)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-54-28679 (JP, A) SAIKAI Shou 59-64562 (JP, U) Shigeharu Onoki, Ed. Published June 30, Asakura Shoten, P. 227-P. 228 JIS R5203 "Method of measuring heat of hydration of cement"

Claims (6)

[Claims] 1. A test tank (16) containing a sample (15) made of concrete mixed so as to reflect an actual mixture and property at a construction site, and the test tank (16).
Is detachably accommodated in the storage container (10), and the control unit (1
According to 1), while controlling the temperature of the test environment so that the test tank surface temperature follows the temperature rise inside the sample, the sample (15)
In a device for adiabatic temperature rise test of a sample with self-heating for measuring the self-heating amount and its heating rate, the storage container (10) can be divided into a plurality of parts, and the respective divided parts are combined and integrated. If the test tank (1
6) a container for enclosing and storing 6) is formed, and a divided lower end is formed on a movable carriage (12), and a heat insulating material is provided on the inner surface of the container for each divided portion of the storage container (10). (13) is lined, and the heat medium circulating flow paths (30 to 3) are arranged inside the heat insulating material (13) to closely contact the outer surface of the test tank (16) and to circulate the temperature-controlled heat medium.
2, 45, 46, 51) heat medium jacket (1
4) is formed, and the heat medium circulating flow paths (30 to 3) are provided in the control unit (11).
2 or 45, 46, 51) and a heating medium supply system (6) provided with a heating medium circulating means (59) for circulating the temperature controlled heating medium at high speed and a heating medium tank (58) for storing the heating medium.
0, 70) is connected, and an adiabatic temperature rise test device for samples with self-heating. 2. An adiabatic temperature rise test apparatus for a sample with self-heating according to claim 1, wherein water is used as the heat medium. 3. A device for adiabatic temperature rise test of a sample accompanied by self-heating according to claim 1, wherein silicon oil is used as the heating medium. 4. A sample with self-heating according to claim 1, characterized in that the surface of the heating medium jacket (14) closely contacting the outer surface of the test tank (16) is mirror-finished. Adiabatic temperature rise test equipment. 5. An adiabatic temperature of a sample with self-heating according to claim 1, characterized in that the heat medium jacket (14) has a heat medium circulating passage (30 to 32) of a pipe structure. Lift test equipment. 6. A heat medium circulating flow channel (4) having a flow channel divided by a partition wall as the heat medium jacket (14).
5, 46, 51). The adiabatic temperature rise test device for a sample with self-heating according to claim 1.