JP3195964B2 - 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 an apparatus and a method for measuring the content of an admixture in uncured concrete (hereinafter simply referred to as "concrete") using an odor sensor. .

[0002]

2. Description of the Related Art Conventionally, in a ready-mixed concrete construction site of this type, it has been difficult to measure the amount of admixture mixed in the ready-mixed concrete. , Measure the amount of air, evaluate the characteristics of the ready-mixed concrete, take a sample and make a test piece,
After 28 days, a method of measuring the strength was taken.

[0003] Therefore, the suitability of the amount of admixture is determined by slump,
Since only the method of comprehensive judgment could be taken by the measured value of the amount of air and the visual inspection of the ready-mixed concrete, the following measuring method which improved such a measuring method requiring a long time was used. Specifically, it collects volatile components generated from the admixture mixed in the ready-mixed concrete, measures the concentration of the collected volatile components using a gas sensor, and based on the concentration, There is a method of calculating the amount of admixture mixed in ready-mixed concrete (Japanese Patent Application No. 1-340134). Also,
After conducting the test method (JISA1128) based on the pressure of the air volume of the ready-mixed concrete that has not yet solidified, the discharged air is collected in a small container, and the volatile component caused by the admixture is measured by a gas sensor. And measuring the amount of admixture admixed (Japanese Patent Application No. Hei 3-190849)
was there.

[0004]

Accordingly, the determination of the appropriateness of the amount of the admixture mixed in the ready-mixed concrete is made by an indirect method using an improved indirect method such as the measurement of the air amount and the slump value described above by the contractor at the construction site. In addition, there is a problem that the measurement requires a long time, complicated steps and cost, and it is difficult to ensure stable quality of the ready-mixed concrete. In addition, the two methods of the prior application for measuring the volatile components volatilized by the admixture mixed in the ready-mixed concrete and calculating the amount of the admixture, use the exhaust gas after measuring the amount of air. There is a problem that management of sampling and temperature measurement is difficult, and the measured values vary.

[0005] In order to solve the problems of the conventional ready-mixed concrete , the present invention measures the content of the admixture of the ready-mixed concrete simply, promptly and accurately, and prepares the ready-mixed concrete. An apparatus and method for measuring the amount of an admixture in ready-mixed concrete aiming at maintaining a proper component ratio and contributing to quality improvement.

[0006]

The present invention will be described with reference to the drawings shown in FIGS. 1 and 2. The volatile odor component generated from the surface of the ready-mixed concrete (10) is transferred to the lid (2) of the container (1). (2) stay inside the diffusion recess (2a) formed inside, and cover (2)
Through a circulation pipe (5) that penetrates the container (1) and into a measuring device (3) attached to a lid (2) that can be detachably attached to the container (1), and smells the introduced volatile odor component. This is a method for measuring the amount of an admixture in ready-mixed concrete , wherein the concentration of the mixture is measured by an odor sensor (8) built in the measuring device (3).

Further, according to the present invention, there is provided a container (1) which is retained in a diffusion recess (2a) formed inside a lid (2) which is fitted and sealed to a flange edge (1a) of a container (1). The volatile odor component generated from the surface of the ready-mixed concrete (10) is introduced through a circulation pipe (5) into a measuring instrument (3) attached to a detachable lid (2), and the measuring instrument This is a device for measuring the amount of an admixture in ready-mixed concrete , which measures the concentration of odor using the odor sensor (8) built in (3).

[0008]

The present invention relates to a measuring method having such a configuration and a measuring device used for such a measuring method,
In the container (1) in which (10) was rubbed up to the brim edge (1a) of the container (1), the ready-mixed concrete (1) was removed from the surface of the ready-mixed concrete (10).
Volatile components generated from the admixture mixed in (0) stay in the concave portion (2a) having a capacity of about 100 to 500 cc pierced in the inner surface of the closed lid (2). The evaporating component is led to the odor sensor (8) through the circulation pipe (5) to detect the concentration of the odor, and the output is input to the CPU arithmetic unit (12) in the measuring instrument (3), whereby the raw concrete ( Ten)
The amount of admixture mixed in can be calculated and determined.

Further, the measuring device (3) having the above-mentioned configuration is the same as the container used for the "air amount measuring device" and has a fixed capacity (1).
The lid (2), which has a diffusion recess (2a) formed inside the lid (2) that fits into the flange edge (1a) and hermetically seals it, is detachable from the lid. This is a device for measuring the amount of admixture in ready-mixed concrete , which can be easily transported and carried, and can easily and accurately measure the quality of ready-mixed concrete at a construction site.

[0010]

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 a container of an air amount measuring device which collects about 7 liters of ready-mixed concrete (10), and the measured fresh-concrete is stored in the brim edge (1a) of the container (1) by being completely rubbed and quantified (about 7 liters).
L) can accommodate. Packing the container (1) (30)
A recess (2a) is formed in the lid (2), which is hermetically closed by a suction pipe (5a) or a discharge port (5b) of the circulation pipe (5) communicating with the outside. Diffusers (5c) and (5d) for facilitating uniform concentration in the portion (2a) are mounted in the concave portion (2a) with vent holes radially opened.

The measuring device (3) includes: a suction port (5a) or a discharge port (5b) of the circulation pipe (5) by the circulation pipe (5);
Through the recess (2a). In the measuring device (3),
3-way cock (16a), (16b), hot-wire semiconductor odor sensor
(8), pipe (5) forming a circulation path for circulating pump (9)
The diffuser (5c) and (5d) always keep the gas remaining in the lid (2) at a uniform concentration.

The output of the odor sensor (8) is
a), input to the multiplexer (11a), the output of the temperature sensor (6) is also input to the multiplexer (11a) through the temperature measuring device (7), and the output is
(11b), and further output the result to the CPU arithmetic unit (12)
The results are displayed on an LCD display (14), and the output is printed by a printer (13). Also, from the keyboard (15), the CPU arithmetic unit (1
2) Input and control.

A three-way cock (16a) is provided in the middle of the pipe (5), and external air flows through an activated carbon filter (17).
Further, another three-way cock (16b) is discharged to the outside for exhaust.

Next, the usage of the embodiment of FIG. 1 will be described. First, a container (1) to be measured is rubbed, and a predetermined amount (about 7 liters) of the raw raw concrete (10) to be measured is rubbed into the flange (1a) of the container (1). Thus, the lid (2) is covered and sealed through the packing (30), and the pump (9) is operated to circulate the volatile components in the circulation pipe (5). (2a) and the concentration in the pipe (5) are made uniform to a constant value. Next, when the hot wire type odor sensor (8) attached in the middle of the pipe (5) is operated and brought into contact, the odor sensor (8) can accurately measure the concentration of the odor of the volatile component.

The output is obtained as the output through the CPU operation unit (12). The measured value is calculated as the concentration of the odor of the admixture in the raw concrete to be measured (10) from the relationship between the amount of the admixture and the indicated measurement value in FIG. Displayed and recorded, and printed out by the printer (13). In this way, the volatile components are uniformly stirred, and the concentration of the odor is measured by the odor sensor (8).

FIG. 2 shows the relationship between the actual admixture 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 materials for the ready-mixed concrete for test, 3607 g of cement, 11615 g of sand, and 1443 g of tap water were used as admixtures with Sunflow (product name of Sanyo Kokusaku Pulp Co., Ltd.) and Mighty 2000 (product name of Kao Corporation). In the test, the mixing amount of the admixture was changed to 10 g, 30 g, 50 g, and 80 g.
In tests, it is qualitatively desirable that the actual amount of admixture be around this normal value.

The feature and configuration of the method for measuring the amount of the admixture in the ready-mixed concrete (10) and determining the quality are as follows: the concentration of the odor of volatile components generated from the ready-mixed concrete (10) is measured using an odor sensor (8). Detect, from the concentration of the odor, measure the amount of admixture mixed with the admixture, determine the quality of ready-mixed concrete (10), further calculate the quality judgment value when using the admixture, based on the quality judgment value, The quality of the ready-mixed concrete (10) can be determined.

The quality judgment item of the ready-mixed concrete (10) includes "measurement of air amount" by an air amount measuring device, and its measuring method and judgment method are standardized by JIS. Shall be shown.

In the container (1), the raw concrete to be measured (10) is rubbed into the flange (1a) of the container (1), and a fixed amount is poured into the container (1).
Cover and seal. Next, water is injected between the ready-mixed concrete (10) and the lid (23) to remove air.

At the top of the lid (23), an air chamber (20) having a content of about 5% of that of the container (1) is attached, and pressure is sent to the air chamber (20) by a manual air pump. At a point slightly beyond the initial pressure point, stop the operation of the pump, align the needle tip with the initial pressure point, press the operating lever (21) to open the on-off operating valve (22), and release the air pressure to the container (1). And read the pressure gauge pointer. The measurement of the amount of the admixture in the uncured concrete (prepared concrete) of the present invention has an advantage that it can be carried out with the same container and the same sample as the "measurement of the amount of air".

That is, after the “admixture measurement” is completed,
Remove the lid (2) and the measuring instrument (3) and open the lid for `` measurement of air volume ''
If (23) is installed, “measurement of air volume” can be performed as it is. Since the sample amount and the surface area of the ready-mixed concrete (10) are constant, the reproducibility of the measurement is good and accurate measured values can be obtained. In the measurement by the odor sensor (8) of the present invention, from the concave portion (2a) of the lid portion (2) to the pump (9) and the odor sensor (8), the convenience can be obtained after the concentration is made uniform by suction circulation. And accurate measurement is possible.

In this way, the concentration of the odor of the volatile component (although it depends on the kind of the admixture in a real number),
As shown in FIG. 2, it is linearly related to the amount of the admixture in the ready-mixed concrete. As a result, "measurement of the amount of air" which is one of the criteria for the quality judgment of the ready-mixed concrete (10) with the same container and the same sample as the measurement of the amount of the admixture in the ready-mixed concrete (10) can be performed.

The volatile components generated from the admixture include:
Adsorbed and remained on the material surface such as the recess (2a) and the pipe (5),
Since it will adversely affect the next measurement, wash it by flowing air through activated carbon (17), or wash it by dissolving it with ozone gas, etc., and discharge it to the outside through the three-way cock (16b). The measurement can be repeated in a short time.

A temperature sensor (6) is provided on a part of the lid (2).
Attach the sensor so that it protrudes into the recess (2a) of the lid (2), detect the temperature inside the ready-mixed concrete (10), and
To the multiplexer (11a) to correct the temperature of the output of the odor sensor (8).

There are various types of containers (1) used for the "air volume measuring device", but the width of the flange (1a) of the container (1) is uniform for the same capacity. , Macross type is wider.

As shown in FIG. 4, in a normal case, a guide (24) is attached to three places on the inner peripheral portion of the lid (2) by tightening with a fixing screw (25) to hermetically seal. For Macross type,
As the width of the flange (1a) is wide, as shown in FIG.
By mounting the container (24) in the opposite direction, the lid (2) of the device can be sealed to accommodate the Macross-type container (1).

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

[0028]

As is apparent from the above description, the present invention provides a method for detecting the concentration of a volatile component generated from an admixture mixed in ready-mixed concrete by using a gas sensor to detect the amount of the admixture. Since the amount of the admixture in the ready-mixed concrete is measured, the quality of the ready-mixed concrete can be easily determined, which has a remarkable effect that cannot be expected from the conventional one.

Further, according to the present invention, when the container of the “air amount measuring device” is shared with the container (1) of the present device, the same container and sample are used as they are after measuring the amount of the admixture in the ready-mixed concrete. By simply replacing the measuring part with the lid (2), it is possible to continue to measure the air volume, not only to improve the efficiency significantly, but also to easily perform the quality control of the ready-mixed concrete, The quality can be improved, and the effect of obtaining a stable quality of ready-mixed concrete can be expected.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present 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 diagram showing an air amount measuring device.

FIG. 4 is a diagram showing a relationship in a case where a lid is attached to a container in a normal direction.

FIG. 5 is a diagram showing a relationship in the case of a Macross type orientation in which a lid is attached to a container.

[Explanation of symbols]

 (1) Container (1a) Flange (2) Lid (2a) Recess (3) Measuring instrument (5) Circulation pipe (5a) Inlet (5b) Outlet (5c), (5d) Diffuser (6) Temperature sensor (7) Temperature measurement device (8) Hot wire semiconductor odor sensor (8a) Detection amplifier (9) Pump (10) Uncured concrete (prepared concrete) (11a) Multiplexer (11b) A / D converter (12) CPU operation Equipment (13) Printer (14) LCD recorder (15) Keyboard (16a), (16b) Three-way click (17) Activated carbon filter (20) Air chamber (21) Lever (22) Open / close operating valve (23) (Air volume Lid (for measurement) (24) Guide (25) Fixing screw

──────────────────────────────────────────────────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 Industrial Association Central Technology Research Institute (72) Inventor Tatsuo Saito Mitsuya, Yodogawa-ku, Osaka-shi, Osaka Naka 2-5-4 Shinko Cosmos Electric Co., Ltd. (56) References JP-A-3-199965 (JP, A) JP-A-7-5165 (JP, A) (58) Fields investigated (Int. . ^7, DB name) B28C 7/02 G01N 1/22 G01N 33/38

Claims (4)

(57) [Claims] A volatile odor component generated from the surface of uncured concrete (10) is retained in a diffusion recess (2a) formed inside a lid (2) of a container (1), Through a circulation pipe (5) penetrating the lid (2), it is introduced into the measuring instrument (3) attached to the lid (2) which can be detachably attached to the container (1), and the introduced volatilization The concentration of the odor component
A method for measuring the amount of admixture in uncured concrete, which is measured by an odor sensor (8) built in the measuring device (3). 2. A lid (2) for sealing to a flange (1a) of a container (1).
Volatile odor components generated from the surface of the unhardened concrete (10) staying in the diffusion recesses (2a) formed inside the pipe are passed through the circulation pipe (5) that penetrates the lid (2). An uncured concrete which is introduced into a measuring device (3) attached to a detachable lid (2) and which is used to measure the concentration of odor by the odor sensor (8) built in the measuring device (3). A device for measuring the amount of admixture inside. 3. A suction port (5a) or a discharge port (5b) of a circulation pipe (5) attached to the lid (2) and opened to a recess (2a).
In addition, a diffuser that makes it easier to equalize the concentration in the recess (2a)
The apparatus for measuring the amount of an admixture in uncured concrete according to claim 2, further comprising (5c) and (5d). 4. A temperature sensor (6) for correcting a temperature characteristic of the odor sensor (8) is mounted in a concave portion (2a) of the lid (2),
The apparatus for measuring the amount of an admixture in uncured concrete according to claim 2 or 3, wherein the temperature in the uncured concrete (10) is detected.