JP2601735B2 - Method and apparatus for measuring the amount of admixture in uncured concrete - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for judging whether or not an amount of an admixture mixed in uncured concrete (hereinafter, abbreviated as "concrete") is a predetermined amount (specified amount). It is about.

[0002]

2. Description of the Related Art Conventionally, at this kind of ready-mixed concrete construction site, it has been very difficult to easily measure the amount of the admixture mixed into the ready-mixed concrete.
For this type of determination, slump and air volume were measured to evaluate the characteristics of the ready-mixed concrete, and a sample was taken to prepare a test piece, and its strength was measured after 28 days. Therefore, there was no method for determining the suitability of the amount of the admixture based on the slump, the measured value of the air amount and the visual inspection of the ready-mixed concrete by comprehensive inspection. Therefore, the applicants have used a gas sensor,
Generated from admixtures added in uncured concrete
Measure the concentration of volatile components and measure the amount of the admixture
Method was developed and disclosed in Japanese Unexamined Patent Publication No.
Method of measuring the amount of admixture in REITs ".

[0003]

Accordingly, the determination of the appropriateness of the amount of the admixture mixed in the ready-mixed concrete is not less than the case where the contractor at the construction site performs as described above with the prior art.
There was a problem that it was difficult to ensure stable quality of ready-mixed concrete. Therefore, under such a rough inspection, there is a problem that even if it is inferior, some admixtures are mixed in more than the specified amount and the tests such as slump value have been cleared. It was hot. Meanwhile, the application
In the method for measuring the amount of admixture of uncured concrete,
At the time of measurement, collect the test sample in a container or directly
The measurement was performed by inserting a detection probe into the ready-mixed concrete.
Method equilibrates the concentration of volatile components generated from ready-mixed concrete
And it takes time for the gas sensor reading to become constant.
However, it was not suitable for on-site work. Meanwhile, quality inspection of ready-mixed concrete
Inspection was conducted at the time of unloading for slump, air volume and strength.
This is performed by SA5308. Of these tests air
For the air volume test, use the air volume measurement device (1) shown in FIG.
Since it is implemented by the pressure method (JISA1128),
The volatile components contained in the exhaust gas discharged at this time are
Accurate and quick admixture in ready-mixed concrete measured by gas sensor
The purpose is to improve the quality by measuring the amount of raw concrete and keeping the component ratio of the ready-mixed corn properly.

[0004]

The structure of the present invention for achieving the object will be described with reference to FIGS. 1 to 5 corresponding to the embodiment. The concentration of the volatile component generated from the mixed admixture is determined by the gas sensor (8 ) from the exhaust gas of the air amount measuring device (1).
The present invention relates to a method for measuring the amount of admixture in ready-mixed concrete in which the amount of admixture is measured by detecting the amount of admixture.
0) Empty the volatile components generated from entrained admixture in
The sample is collected in a small container (7) or a gas bag (18) attached to the air volume measuring device (1), and its volatile component is detected by a gas sensor (8), whereby the amount of the admixture is measured. This is a method for measuring the amount of an admixture in ready-mixed concrete described in the first aspect of the present invention.

The third invention relates to a method for measuring the amount of volatile components generated from an admixture mixed in a ready-mixed concrete (10) with an air amount measuring device (1).
The invention according to the first invention, wherein the amount of the admixture is measured by collecting the volatile component in a gas detection probe (20) detachably attached to the sample and detecting the volatile component by a gas sensor (8). This is a method for measuring the amount of admixture in ready-mixed concrete. Further, the fourth invention provides an air amount measuring device (1) for collecting volatile components generated from an admixture mixed in ready-mixed concrete (10).
Small container detachably attached to the gas exhaust valve (6)
(7) Or a device for measuring the amount of an admixture in ready-mixed concrete provided with a gas bag (18) and a gas sensor (8) for detecting the concentration of the volatile component collected therein.

Further, the fifth aspect of the present invention provides a gas removably attached to a gas exhaust valve (6) of an air amount measuring device (1) for collecting volatile components generated from an admixture mixed in ready-mixed concrete. This is an apparatus for measuring the amount of an admixture in ready-mixed concrete, comprising a detection glove (20) and a gas sensor (8) for detecting the concentration of a volatile component collected in the glove.

[0007]

According to the present invention, there is provided a measuring method and a measuring device having such a constitution, wherein volatile components generated from an admixture mixed in ready-mixed concrete are measured by an air amount measuring device (1).
Luo 10~100cc about another small amount container (type of admixture, the amount, determine the appropriate collection amount by the sensitivity, etc. of the gas sensor), it was collected in a gas bag or gas sensing probe or the like,
This volatile component is guided to a gas sensor to measure the concentration. The concentration of this volatile component is shown in FIG.
As shown in the figure, it is linearly related to the amount of the admixture in the ready-mixed concrete.
(The actual number varies depending on the type of admixture.) By utilizing this characteristic, the concentration of volatile components generated from the admixture in the ready-mixed concrete is detected by a gas sensor, and the amount of the admixture mixed in the ready-mixed concrete can be reduced. The quantity can be determined arithmetically. As a result, the amount of the admixture in the ready-mixed concrete can be measured at the same time as "measurement of the amount of air" which is one of the criteria for judging the quality of the ready-mixed concrete.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a specific embodiment of the first embodiment of the present invention. (1) is an air meter (air meter) that collects about 7 liters of ready-mixed concrete (10), and its lid
(2) has an air chamber (2a) and a pressure gauge (3). Further, a manual air pump (4) is attached, and air can be injected under pressure into the air chamber (2a). Opening / closing valve (5)
The air in the air chamber (2a) is injected into the container (1) by the lever (5b). (6) is a gas discharge valve which can be opened and closed by a cock (6b), and discharges air (gas) at the upper part of the container (1) of the air amount measuring device to the outside. (7) is a small container. (8)
Is a gas sensor, a pipe (1) for guiding gas from a small container (7).
1) and a pump (9) is installed in the middle. Gas sensor
(8) leads to the display (13) and recorder (14). Another cock (15) is provided in the small container (7), a three-way cock (16) is provided in the pipe (11), and the activated carbon filter (17) is a three-way cock (16)
Connect to one of the

Next, the usage of the embodiment shown in FIG. 1 will be described. First of all, the fresh concrete (10) to be measured is almost completely filled (7 liters) into the air amount measuring device (1). Then, the lid (2) is covered and sealed, and the air pressure is reduced by operating the manual air pump (4) to the air chamber (2).
Press into a) and adjust the scale of the pressure gauge (3). next,
Raise the lever (5b) of the opening / closing operation valve (5), put air in the air chamber (2a) into the container (1), and apply air pressure. Then, the volume change of the ready-mixed concrete (10) due to pressurization is measured. On the other hand, turn on the power of the admixture amount measuring device, open the cock (15), and
Activate the activated carbon filter (17) with the three-way cock (16)
Air through the sensor (8) to stabilize the pace output of the sensor (8), and connect the three-way cock (16) to the original passage pipe (11).
Return to

Next, open the cock (6b) and open the gas discharge valve.
From (6), the volatile components in the container (1) are introduced into the small container (7). Then, when the cock (15) is closed and the volatile component is circulated in the pipe (11) and brought into contact with the gas sensor (8) mounted in the middle of the pipe (11), the gas sensor (8) Can be measured accurately. The measured value is calculated and converted from the admixture amount-measurement instruction value relationship diagram of FIG. When the pressure applied in this way is released, the volatile component is also released at the same time, and the concentration is measured by the gas sensor (8).

FIG. 2 shows the relationship between the actual mixing amount of the admixture in the ready-mixed concrete (horizontal axis) and the measured value (vertical axis) measured by the measuring apparatus of the present invention (FIG. 1). As the material of the test for students Con, it was commonly used cement 3607g, sand 11615g, San flow as admixture in tap water 1443g (product name of Sanyo Kokusaku Pulp Co., Ltd.) and Ma Itei 2000 (product name of Kao Corporation). In the test, the mixing amount of the admixture was changed to 10 g, 30 g, 50 g, 80 g, and 100 g . In the test, the actual amount of admixture is this admixture amount
-Can be obtained from the relationship diagram (calibration curve)
You.

Also, an admixture added to the ready-mixed concrete (10)
Is used in various compositions by the manufacturer
Because the volatile components generated and their concentrations are different,
For admixtures used by the manufacturer in advance
Test the relationship between the admixture amount and the indicated measurement value (calibration).
Line), the amount of admixture added can be easily calculated.
Can be issued.

The quality judgment item of the ready-mixed concrete (10) includes "measurement of air amount" by the air amount measuring device (1).
Although the determination method is standardized by JIS, there is an advantage that the measurement of the amount of the admixture in the uncured concrete (green concrete) of the present invention can be performed simultaneously with the "measurement of the air amount". Since the sample amount and the surface area of the ready-mixed concrete (10) are constant, the reproducibility of the measurement is good and an accurate measured value can be obtained.

Next, the embodiment shown in FIGS. 3 and 4 will be described. A 50 cc small volume container (7) or a gas bag (18) (shown by a dotted line in FIG. 4) is attached to the gas exhaust valve (6) of the air amount measuring device (1). In this case cook (6b)
Then, the volatile components in the container (1) are collected from the gas discharge valve (6) into the small container (7) or the gas bag (18). The collected volatile components are introduced through the gas introduction pipe of the gas detector (19) shown in FIG. 4, and the concentration of the volatile components is measured by the gas detector (19). The amount of the admixture in the raw concrete (10) to be measured is calculated and converted using the relationship diagram (calibration curve) between the amount of the admixture and the measurement instruction value.

Next, an embodiment shown in FIG. 5 will be described.
Attach the gas detection probe (20) to the gas exhaust valve (6) of the air amount measuring device (1). This gas detection probe (20) has a small container, gas sensor, pump, activated carbon, display,
A recorder is built in and has the configuration described in FIG.
It fulfills the function described in FIG. Therefore, the complicated steps and the trouble of measuring with the apparatus described with reference to FIG. 3 can be omitted.
In the measurement by the gas detection probe (20), there is a convenient and accurate measurement that can be performed by suction circulation from the small container chamber to the pump and the gas sensor.

The volatile components generated from the admixture include:
Adsorbed on the surface of materials such as small containers (7) and pipes (11) and remains, which adversely affects the next measurement.Wash it by flowing air through activated carbon, or decompose it using ozone gas, etc. After washing, the measurement can be repeated in a short time.

The embodiments which are considered to be representative of the present invention have been described above. However, the present invention is not necessarily limited to the structures of the embodiments, but has the above-mentioned constitutional requirements according to the present invention, and The present invention achieves the object of the present invention and can be appropriately modified and implemented within the range having the following effects.

[0018]

As is clear from the above description, the present invention continuously measures the concentration of volatile components generated from an admixture mixed in ready-mixed concrete using an air flow measuring device.
Measurement, so the same as “measurement of air volume”
Sometimes, the concentration of volatile components generated from the admixture is
Convenient and accurate detection
Quality control of ready-mixed concrete as well as simple
Can improve the quality of ready-mixed concrete,
High quality raw concrete can be obtained
I was able to do it.

[0019]

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the first invention.

FIG. 2 is a graph showing a relationship between an amount of an admixture used for carrying out the present invention and a measurement instruction value.

FIG. 3 is a configuration diagram showing another embodiment of the present invention.

FIG. 4 is a configuration diagram showing an example of use of a gas detector used in the present invention.

FIG. 5 is a configuration diagram showing another embodiment of the present invention.

[Explanation of symbols]

 (1) Air volume measuring device (air meter) (2) Lid (2a) Air chamber (3) Pressure gauge (4) Manual air pump (5) Operating valve (5b) Lever (6) Gas exhaust valve (6b) Cock ( 7) Small container (8) Gas sensor (9) Pump (10) Unhardened concrete (fresh concrete) (11) Pipe (13) Display (14) Recorder (15) Cock (16) Three-way cock (17) Activated carbon filter ( 18) Gas bag (19) Gas detector (20) Gas detection probe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuo Suzuki 2-16-1, Hamacho, Funabashi-shi, Chiba Pref. National Institute of Ready-mixed Concrete Industries, Central Research Laboratory (72) Inventor Shin Takeyama 2-chome, Hamacho, Funabashi-shi, Chiba No. 16-1 Japan Central Concrete Institute, Central Technology Research Institute (72) Inventor Koji Ito 2-16-1, Hamacho, Funabashi-shi, Chiba Pref. Kaihei 3-199965 (JP, A)

Claims (5)

(57) [Claims] The concentration of a volatile component generated from an admixture mixed in an uncured concrete (10) is measured by a gas sensor (8) from the exhaust gas of an air amount measuring device (1). A method for measuring the amount of an admixture in uncured concrete, wherein the amount of the admixture is measured by detecting. 2. An air amount measuring device (1) for detecting volatile components generated from an admixture mixed in uncured concrete (10).
A sample is collected in a small container (7) or a gas bag (18) detachably attached to the container, and the volatile component is detected by a gas sensor (8) to measure the amount of the admixture. Item 1. The method for measuring the amount of an admixture in uncured concrete according to Item 1. 3. An air amount measuring device (1) for detecting volatile components generated from an admixture mixed in uncured concrete (10).
2. The method according to claim 1, wherein the amount of the admixture is measured by sampling the gas with a gas detection probe (20) detachably attached to the gas sensor and detecting a volatile component thereof by a gas sensor (8). Method for measuring the amount of admixture in uncured concrete. 4. A small amount detachably attached to a gas exhaust valve (6) of an air amount measuring device (1) for collecting volatile components generated from an admixture mixed in an uncured concrete (10). A device for measuring the amount of an admixture in uncured concrete, comprising a container (7) or a gas bag (18), and a gas sensor (8) for detecting the concentration of a volatile component collected therein. 5. An air amount measuring device for collecting volatile components generated from an admixture mixed in uncured concrete.
Equipped with a gas detection probe (20) detachably attached to the gas exhaust valve (6) of (1), and a gas sensor (8) for detecting the concentration of the volatile component collected in them. Dosage measuring device.