Quality control method and equipment for concrete equivalent to blast furnace cement type A

Abstract

To provide a method and a device in which, when concrete equivalent to a blast furnace cement A kind is produced using Portland cement and a blast furnace cement B kind, the quality of the concrete can be managed and confirmed.SOLUTION: A quality management method for concrete equivalent to a blast furnace cement A kind comprises steps in which: with the target masses of Portland cement and a blast furnace cement B kind as a first target mass and a second target mass, respectively, the Portland cement and the blast furnace cement B kind are weighed based on the first and second target masses (S2); the weighed Portland cement and blast furnace cement B kind, water, an aggregate and a chemical admixture are kneaded to manufacture concrete equivalent to a blast furnace cement A kind (S7); and the respective mass measured values of the weighed Portland cement and blast furnace cement B kind are recorded in a storage device in association with identification information of the concrete (S5).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for controlling the quality of concrete produced by mixing Portland cement, blast-furnace slag cement Type B, water, aggregate, and chemical admixtures to produce concrete equivalent to blast-furnace slag cement Type A. [Background technology]

[0002] There are two types of cement: Portland cement (for example, ordinary Portland cement) and blast-furnace cement. Portland cement is the most common type of cement, made by adding gypsum to burnt limestone, clay, etc., to form a powder. Blast-furnace cement is made by mixing Portland cement with blast-furnace slag, and has low heat generation due to hydration and high chemical resistance.

[0003] There are three types of blast furnace cement: Type A, Type B, and Type C. Type A blast furnace cement contains blast furnace slag by mass, which is more than 5% but not more than 30%, Type B blast furnace slag by mass, which is more than 30% but not more than 60%, and Type C blast furnace slag by mass, which is more than 60% but not more than 70%.

[0004] Patent Document 1 discloses a technology for producing concrete equivalent to blast-furnace cement Type A by mixing Portland cement, blast-furnace cement Type B, water, aggregate, and chemical admixtures. This concrete equivalent to blast-furnace cement Type A has the same performance as regular concrete, and can reduce carbon dioxide emissions derived from concrete materials by 8.2 to 18.5%. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6812310 Summary of the Invention [Problem to be solved by the invention]

[0006] It is desirable to be able to control and verify the quality of concrete produced using the above-mentioned blast furnace cement type A.

[0007] Therefore, an object of the present invention is to provide a manufacturing method and apparatus that can control and confirm the quality of concrete equivalent to blast-furnace slag cement type A. [Means for solving the problem]

[0008] In order to achieve the above object, according to the present invention, (A) The target masses of Portland cement and blast-furnace slag cement Type B are set as the first target mass and the second target mass, respectively, and the Portland cement and blast-furnace slag cement Type B are measured based on the first and second target masses; (B) Mix the measured Portland cement and blast-furnace cement type B with water, aggregate, and chemical admixtures to produce concrete equivalent to blast-furnace cement type A; (C) A quality control method for concrete equivalent to blast-furnace cement type A is provided, in which the measured mass values ​​of the Portland cement and the blast-furnace cement type B are recorded in a storage device in correspondence with the identification information of the concrete.

[0009] In order to achieve the above object, the present invention provides a quality control device for concrete equivalent to blast-furnace cement type A, which is produced by mixing Portland cement, blast-furnace cement type B, water, aggregate, and chemical admixtures, comprising: a measuring device that measures the Portland cement and the blast-furnace cement type B based on the first and second target masses, where the target masses of the Portland cement and the blast-furnace cement type B are set as a first target mass and a second target mass, respectively; A quality control device for concrete equivalent to blast-furnace cement type A is provided, which is equipped with a memory device in which the mass measurement values ​​of the Portland cement and the blast-furnace cement type B measured by the measuring device are stored in correspondence with the identification information of the concrete. [Effects of the Invention]

[0010] According to the present invention, the masses of Portland cement and Type B blast-furnace cement used to produce concrete equivalent to Type A blast-furnace cement are measured, and each measured mass is recorded in association with the identification information of the produced concrete equivalent to Type A blast-furnace cement. Therefore, the recorded data can ensure that the concrete equivalent to Type A blast-furnace cement has been produced in accordance with a specified mixing ratio of Portland cement and Type B blast-furnace cement. As a result, the required performance of the concrete can be guaranteed. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic configuration diagram of a concrete quality control device according to an embodiment of the present invention. [Figure 2] 1 is a flowchart illustrating quality control of concrete according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] An embodiment of the present invention will be described with reference to the drawings. In addition, common parts in the drawings are given the same reference numerals, and duplicated explanations will be omitted.

[0013] FIG. 1 is a schematic diagram of a concrete quality control device 10 according to an embodiment of the present invention. The quality control device 10 is a device for controlling the quality of concrete equivalent to blast-furnace cement Class A. Concrete equivalent to blast-furnace cement Class A is ready-mixed concrete produced by mixing Portland cement, blast-furnace cement Class B, aggregates (fine aggregate and coarse aggregate), water, and chemical admixtures. Such concrete equivalent to blast-furnace cement Class A will be simply referred to as Class A-equivalent concrete hereinafter.

[0014] In Type A equivalent concrete, the mass ratio of blast furnace slag to the combined mass of Portland cement and Type B blast furnace cement (excluding water, aggregates, and chemical admixtures) is more than 5% and not more than 30%. The mass ratio of blast furnace slag is the ratio of the mass of blast furnace slag contained in the target cement to the total mass (excluding water, aggregates, etc.) of the target cement (i.e., only Portland cement and Type B blast furnace cement in the ready-mix concrete) (the same applies hereinafter). Furthermore, in this application, when a and b are numerical values ​​and it is stated that "the mass ratio is a% to b%," the range indicated by "a% to b%" may or may not include a% or b%.

[0015] The concrete quality control device 10 may be installed in a ready-mixed concrete manufacturing facility. This manufacturing facility may be, but is not limited to, a ready-mixed concrete manufacturing plant (ready-mixed concrete plant) located on land. For example, this manufacturing facility may be installed on a ship. The concrete quality control device 10 includes a weighing device 3, a mixer 5, and a memory device 7. Note that the mixer 5 does not have to be a component of the quality control device 10.

[0016] The weighing device 3 automatically measures Portland cement and blast-furnace cement type B based on the first and second target masses. That is, the weighing device 3 automatically measures Portland cement and blast-furnace cement type B so that their masses become the first and second target masses, respectively. The first and second target masses are determined based on a predetermined mixing ratio of Portland cement and blast-furnace cement type B and the target mass of the total Class A equivalent concrete to be produced. The predetermined mixing ratio is determined in advance so that the mass ratio of blast-furnace slag in the Class A equivalent concrete to be produced is more than 5% and not more than 30%, as described above. The predetermined mixing ratio will be described later.

[0017] The weighing device 3 also automatically measures the aggregate. More specifically, aggregates include coarse aggregate and fine aggregate, and the weighing device 3 automatically measures the coarse aggregate so that its mass is the coarse aggregate target mass, and the fine aggregate so that its mass is the fine aggregate target mass. Furthermore, the weighing device 3 automatically measures the chemical admixture so that its mass is the admixture target mass, and automatically measures the liquid mixture of water and chemical admixture so that its mass is the water target mass. The coarse aggregate target mass, fine aggregate target mass, admixture target mass, and water target mass may be determined, for example, based on the target mass of the entire Class A equivalent concrete to be produced.

[0018] The measuring device 3 has a first supply device 11, a first measuring instrument 21, a second supply device 12, a second measuring instrument 22, a coarse aggregate supply device 13X, a coarse aggregate measuring instrument 23X, a fine aggregate supply device 13Y, a fine aggregate measuring instrument 23Y, an admixture supply device 14, a water supply device 15, an admixture and water measuring instrument 24, a control unit 31, and an error calculation unit 41.

[0019] The first supply device 11 supplies Portland cement to the first measuring device 21. The first supply device 11 has a storage bottle 11a and an opening / closing gate 11b. The storage bottle 11a holds a sufficient amount of Portland cement inside. The Portland cement in the storage bottle 11a may be transported from a cement silo at the ready-mixed concrete plant. The opening / closing gate 11b opens and closes an opening at the bottom of the storage bottle 11a. When the opening / closing gate 11b is opened, the Portland cement falls from the storage bottle 11a through the opening at the bottom (opening / closing gate 11b) into the first measuring device 21. This supplies Portland cement to the first measuring device 21 (measuring bottle 21a, described below).

[0020] The first measuring device 21 holds the Portland cement supplied from the first supply device 11, measures the mass of the Portland cement it holds, and outputs the mass measurement value to the control unit 31. The first measuring device 21 has a measuring bottle 21a, a load cell 21b, and an opening / closing gate 21c.

[0021] Measuring bottle 21a is supported (e.g., suspended) from a structure via load cell 21b. Measuring bottle 21a holds Portland cement supplied from first supply device 11 inside. Load cell 21b measures the mass of the Portland cement held in measuring bottle 21a and outputs the mass measurement value to control unit 31. Opening and closing gate 21c opens and closes an opening provided at the bottom of measuring bottle 21a. When opening gate 21c, Portland cement falls from measuring bottle 21a through the opening at the bottom (opening gate 21c) into mixer 5. In this way, Portland cement is supplied to mixer 5.

[0022] The second supply device 12 supplies Type B blast-furnace cement to the second measuring device 22. The second supply device 12 has a storage bottle 12a and an opening / closing gate 12b. The storage bottle 12a holds a sufficient amount of Type B blast-furnace cement inside. The Type B blast-furnace cement in the storage bottle 12a may be transported from a cement silo at the ready-mix concrete plant. The opening / closing gate 12b opens and closes an opening at the bottom of the storage bottle 12a. When the opening / closing gate 12b is opened, the Type B blast-furnace cement falls from the storage bottle 12a through the opening at the bottom (opening / closing gate 12b) into the second measuring device 22. This supplies Type B blast-furnace cement to the second measuring device 22 (measuring bottle 22a described below).

[0023] The second measuring device 22 holds the blast-furnace cement type B supplied from the second supply device 12, measures the mass of the blast-furnace cement type B held therein, and outputs the mass measurement value to the control unit 31. The second measuring device 22 has a measuring bottle 22a, a load cell 22b, and an opening / closing gate 22c.

[0024] The measuring bottle 22a is supported (e.g., suspended) from a structure via a load cell 22b. The measuring bottle 22a holds the type B blast-furnace cement supplied from the second supply device 12 inside. The load cell 22b measures the mass of the type B blast-furnace cement held in the measuring bottle 22a and outputs the mass measurement value to the control unit 31. The opening / closing gate 22c opens and closes an opening provided at the bottom of the measuring bottle 22a. When the opening / closing gate 22c is opened, the type B blast-furnace cement falls from the measuring bottle 22a through the opening at the bottom (opening / closing gate 22c) and into the mixer 5. In this way, the type B blast-furnace cement is supplied to the mixer 5.

[0025] The coarse aggregate supplying device 13X supplies coarse aggregate to the coarse aggregate measuring device 23X. The coarse aggregate supplying device 13X has a storage bottle 13a and an opening / closing gate 13b. The storage bottle 13a holds a sufficient amount of coarse aggregate inside. The coarse aggregate in the storage bottle 13a may be transported from an aggregate storage area of ​​the ready-mixed concrete plant. The opening / closing gate 13b opens and closes an opening provided at the bottom of the storage bottle 13a. When the opening / closing gate 13b is opened, the coarse aggregate falls from the storage bottle 13a through the opening at the bottom (opening / closing gate 13b) into the coarse aggregate measuring device 23X. This allows the coarse aggregate to be supplied to the coarse aggregate measuring device 23X (measuring bottle 23a described below).

[0026] The coarse aggregate measuring device 23X holds the coarse aggregate supplied from the coarse aggregate supply device 13X, measures the mass of the held coarse aggregate, and outputs the mass measurement value to the control unit 31. The coarse aggregate measuring device 23X has a measuring bottle 23a, a load cell 23b, and an opening / closing gate 23c.

[0027] Weighing bottle 23a is supported (e.g., suspended) from a structure via load cell 23b. Weighing bottle 23a holds therein coarse aggregate supplied from coarse aggregate supply device 13X. Load cell 23b measures the mass of the coarse aggregate held by measuring bottle 23a and outputs the measured mass value to control unit 31. Opening gate 23c opens and closes an opening provided at the bottom of measuring bottle 23a. When opening gate 23c, coarse aggregate falls from measuring bottle 23a through the opening at the bottom (opening gate 23c) into mixer 5. In this way, coarse aggregate is supplied to mixer 5.

[0028] The fine aggregate supplying device 13Y supplies fine aggregate to the fine aggregate measuring device 23Y. The configurations and operations of the fine aggregate supplying device 13Y and the fine aggregate measuring device 23Y are the same as those of the coarse aggregate supplying device 13X and the coarse aggregate measuring device 23X, and therefore a description thereof will be omitted. That is, the configurations and operations of the fine aggregate supplying device 13Y and the fine aggregate measuring device 23Y are the same as those described above, except that the coarse aggregate supplying device 13X, the coarse aggregate measuring device 23X, and the coarse aggregate are replaced with the fine aggregate supplying device 13Y, the fine aggregate measuring device 23Y, and the fine aggregate, respectively.

[0029] The admixture supply device 14 supplies a liquid chemical admixture to a measuring device 24. The admixture supply device 14 has a storage bottle 14a and a valve 14b. The storage bottle 14a holds a sufficient amount of chemical admixture inside. The valve 14b opens and closes an opening at the bottom of the storage bottle 14a. When the valve 14b is opened, the chemical admixture flows downward from the storage bottle 14a through the opening at the bottom (valve 14b) and is supplied to the measuring device 24 (measuring bottle 24a, described below).

[0030] Water supply device 15 supplies water to measuring device 24. Water supply device 15 has storage bottle 15a and valve 15b. Storage bottle 15a holds a sufficient amount of water inside. The water in storage bottle 15a may be supplied from, for example, an underground water tank installed in a ready-mixed concrete plant, or it may be tap water, industrial water, recycled water, etc. Valve 15b opens and closes an opening provided at the bottom of storage bottle 15a. When valve 15b is opened, water flows downward from storage bottle 15a through the opening at the bottom (valve 15b) and is supplied to measuring device 24 (measuring bottle 24a described below).

[0031] The measuring device 24 holds the liquids (chemical admixture and water) supplied from the admixture supply device 14 and the water supply device 15, measures the mass of the liquids it holds, and outputs the measured mass value to the control unit 31. The measuring device 24 has a measuring bottle 24a, a load cell 24b, and a valve 24c.

[0032] Measuring bottle 24a is supported (e.g., suspended) from a structure via load cell 24b. Measuring bottle 24a holds the liquid supplied from admixture supply device 14 and water supply device 15. Load cell 24b measures the mass of the liquid held in measuring bottle 24a and outputs the measured mass value to control unit 31. Valve 24c opens and closes an opening provided at the bottom of measuring bottle 24a. When valve 24c is opened, the liquid (chemical admixture and water) flows downward from measuring bottle 24a through the opening at its bottom (valve 24c) and is supplied to mixer 5.

[0033] The control unit 31 has input or set in advance the identification information of the Type A equivalent concrete to be produced, the first and second target masses, the target mass of coarse aggregate, the target mass of fine aggregate, the target mass of admixture, and the target mass of water determined as described above.

[0034] Based on the mass measurement value from first measuring device 21 and the first target mass, control unit 31 controls first supply device 11 so that the mass measurement value becomes the first target mass. As a result, first measuring device 21 enters a state where it holds a mass of Portland cement whose deviation from the first target mass is within an allowable range (hereinafter referred to as a receiving completion state).

[0035] More specifically, the control unit 31 controls the opening and closing of the opening / closing gate 11b based on the mass measurement value from the first measuring device 21 and the first target mass. In this control, the control unit 31 opens the opening / closing gate 11b of the first supply device 11 to start the supply of Portland cement from the storage bottle 11a of the first supply device 11 to the measuring bottle 21a, and may close the opening / closing gate 11b of the first supply device 11 when the mass measurement value from the first measuring device 21 approaches the first target mass (for example, when the mass measurement value from the first measuring device 21 becomes a value smaller than the first target mass by a set value). This causes the first measuring device 21 to enter the above-mentioned reception completion state.

[0036] The control unit 31 controls the second supply device 12 based on the mass measurement value from the second measuring device 22 and the second target mass so that the mass measurement value becomes the second target mass. As a result, the second measuring device 22 enters a state where it holds blast-furnace cement type B whose deviation from the second target mass is within an allowable range (hereinafter referred to as the acceptance completion state).

[0037] More specifically, the control unit 31 controls the opening and closing of the opening / closing gate 12b based on the mass measurement value from the second measuring device 22 and the second target mass. In this control, the control unit 31 opens the opening / closing gate 12b of the second supply device 12 to start supplying the blast-furnace cement type B from the storage bottle 12a of the second supply device 12 to the measuring bottle 22a, and when the mass measurement value from the second measuring device 22 approaches the second target mass (for example, when the mass measurement value from the second measuring device 22 becomes a value smaller than the second target mass by a set value), the control unit 31 may close the opening / closing gate 12b of the second supply device 12. This causes the second measuring device 22 to enter the above-mentioned receiving completion state.

[0038] Based on the mass measurement value from the coarse aggregate measuring device 23X and the coarse aggregate target mass, the control unit 31 controls the coarse aggregate supply device 13X so that the mass measurement value becomes the coarse aggregate target mass. As a result, the coarse aggregate measuring device 23X enters a state where it holds coarse aggregate with a mass that is within an allowable range of deviation from the coarse aggregate target mass (hereinafter referred to as a receiving completion state).

[0039] More specifically, the control unit 31 controls the opening and closing of the opening / closing gate 13b based on the mass measurement value from the coarse aggregate measuring device 23X and the coarse aggregate target mass. In this control, the control unit 31 opens the opening / closing gate 13b of the coarse aggregate supplying device 13X to start supplying aggregate from the storage bin 13a of the coarse aggregate supplying device 13X to the measuring bin 23a, and when the mass measurement value from the coarse aggregate measuring device 23X approaches the coarse aggregate target mass (for example, when the mass measurement value from the coarse aggregate measuring device 23X becomes a value smaller than the coarse aggregate target mass by a set value), the control unit 31 may close the opening / closing gate 13b of the coarse aggregate supplying device 13X. This causes the coarse aggregate measuring device 23X to enter the above-mentioned acceptance completion state.

[0040] The control unit 31 controls the fine aggregate supply device 13Y based on the mass measurement value from the fine aggregate measuring device 23Y and the fine aggregate target mass so that the mass measurement value becomes the fine aggregate target mass. As a result, the fine aggregate measuring device 23Y becomes in a state where it holds fine aggregate with a mass that is within an allowable range of deviation from the fine aggregate target mass (hereinafter referred to as the acceptance completion state). The detailed control is the same as that for coarse aggregate, and therefore will not be described here.

[0041] Based on the mass measurement value from the measuring device 24 and the target admixture mass, the control unit 31 controls the admixture supply device 14 so that the mass measurement value becomes the target admixture mass. As a result, the measuring device 24 holds a mass of chemical admixture whose deviation from the target admixture mass is within an acceptable range. The mass measurement value output from the measuring device 24 to the control unit 31 in this state is hereinafter referred to as the admixture measurement value.

[0042] More specifically, the control unit 31 controls the opening and closing of the valve 14b of the admixture supply device 14 based on the mass measurement value from the meter 24 and the admixture target mass. In this control, the control unit 31 opens the valve 14b to start the supply of the chemical admixture from the storage bottle 14a of the admixture supply device 14 to the metering bottle 24a, and may close the valve 14b when the mass measurement value from the meter 24 approaches the admixture target mass (for example, when the mass measurement value from the meter 24 becomes a value smaller than the admixture target mass by a set value). This brings the meter 24 into a state where it holds a mass of chemical admixture whose deviation from the admixture target mass is within an acceptable range.

[0043] Next, the control unit 31 controls the water supply device 15 to supply water to the measuring device 24 holding the chemical admixture. For example, the control unit 31 controls the water supply device 15 based on the mass measurement value from the measuring device 24 and the target water mass so that the measured mass value becomes the target water mass. As a result, the measuring device 24 enters a state (hereinafter referred to as the receiving completion state) in which it holds a liquid (a liquid obtained by combining the chemical admixture and water) whose mass is within an allowable range of deviation from the target water mass.

[0044] More specifically, control unit 31 controls the opening and closing of valve 15b of water supply device 15 based on the mass measurement value from measuring device 24 and the target water mass. In this control, control unit 31 opens valve 15b to start the supply of water from storage bottle 15a of water supply device 15 to measuring bottle 24a, and may close valve 15b when the mass measurement value from measuring device 24 approaches the target water mass (for example, when the mass measurement value from measuring device 24 becomes a value smaller than the target water mass by a set value). This causes measuring device 24 to enter the above-mentioned reception completion state.

[0045] Error calculation unit 41 is incorporated into control unit 31 and calculates the error in weighing by weighing device 3. Hereinafter, the mass measurement values ​​output from first weighing device 21, second weighing device 22, coarse aggregate weighing device 23X, and fine aggregate weighing device 23Y in the acceptance completion state will be referred to as the first to fourth measurement values, respectively. Also, below, the admixture measurement value will be referred to as the fifth measurement value (measurement value of chemical admixture), and the mass measurement value output from weighing device 24 in the acceptance completion state will be referred to as the sixth measurement value. The error calculation unit 41 calculates the error between the first measurement value and the first target mass, the error between the second measurement value and the second target mass, the error between the third measurement value and the coarse aggregate target mass, the error between the fourth measurement value and the fine aggregate target mass, the error between the fifth measurement value and the admixture target mass, and the error between the sixth measurement value and the water target mass as first to sixth errors, respectively.

[0046] The storage device 7 stores the first to sixth measurement values ​​and the first to sixth errors in association with the identification information of the Class A equivalent concrete to be produced. That is, the control unit 31 stores the first to sixth measurement values ​​and the first to sixth errors in the storage device 7 as quality data in association with the identification information of the Class A equivalent concrete to be produced. At this time, the control unit 31 may further store the first and second target masses, the coarse aggregate target mass, the fine aggregate target mass, the admixture target mass, and the water target mass in association with the identification information. The storage device 7 may be a non-volatile memory. For example, the storage device 7 may be a flash memory, a magnetic disk (hard disk), or an optical disk.

[0047] The control unit 31 controls the metering of each material, such as Portland cement, as described above, but may also control the start of material supply. That is, once the first measuring device 21, the second measuring device 22, the coarse aggregate measuring device 23X, the fine aggregate measuring device 23Y, and the measuring device 24 have reached the reception completion state as described above, the control unit 31 may control the first measuring device 21, the second measuring device 22, the coarse aggregate measuring device 23X, the fine aggregate measuring device 23Y, and the measuring device 24 to supply Portland cement, blast-furnace cement type B, coarse aggregate, fine aggregate, chemical admixture, and water to the mixer 5, respectively. At this time, the control unit 31 may perform this control by opening the opening / closing gates 21c, 22c, 23c, 23c of the first measuring instrument 21, the second measuring instrument 22, the coarse aggregate measuring instrument 23X, and the fine aggregate measuring instrument 23Y, and by opening the valve 24c of the measuring instrument 24.

[0048] In this way, the control unit 31 supplies Portland cement, blast-furnace cement Type B, coarse aggregate, fine aggregate, chemical admixtures, and water to the mixer 5 and operates the mixer 5. As a result, the Portland cement, blast-furnace cement Type B, coarse aggregate, fine aggregate, chemical admixtures, and water are mixed in the mixer 5. As a result, Type A equivalent concrete is produced by mixing Portland cement, blast-furnace cement Type B, coarse aggregate, fine aggregate, chemical admixtures, and water.

[0049] (mixing ratio) The above-mentioned predetermined mixing ratio of Portland cement and blast-furnace cement type B may be, for example, a mass ratio determined as follows.

[0050] Here, it is assumed that the mass proportion of blast furnace slag in Portland cement is known to be 0% to 5%, but it is difficult to determine which value between 0% and 5% it is, and that the mass proportion of blast furnace slag in blast furnace cement type B is known to be 40% to 45%, but it is difficult to determine which value between 40% and 45% it is. Under these assumptions, the mixing ratio of Portland cement and blast furnace cement may be predetermined according to Table 1 below.

[0051] [Table 1]

[0052] When following Table 1, the mixing ratio is determined as follows: When producing Type A equivalent concrete with a mass ratio of blast furnace slag of 8% to 13%, the mixing ratio of Portland cement and Type B blast furnace cement is set at 80.0:20.0. When producing Type A equivalent concrete with a mass ratio of blast furnace slag of 13% to 18%, the mixing ratio of Portland cement and Type B blast furnace cement is set at 67.5:32.5. When producing Type A equivalent concrete with a mass ratio of blast furnace slag of 18% to 23%, the mixing ratio of Portland cement and Type B blast furnace cement is set at 55.0:45.0.

[0053] (Tolerance of error) The tolerance range for the error (first error) between the measured mass value (first measurement value) of the weighed Portland cement and the first target mass is, for example, from zero to ±1% of the first target mass. In other words, when the ratio of the absolute value of the first error (first measurement value minus the first target mass) to the first target mass is 1% or less, the first error is within the tolerance range. Similarly, the tolerance range for the error (second error) between the measured mass value (second measurement value) of the weighed blast-furnace cement type B and the second target mass is, for example, from zero to ±1% of the second target mass.

[0054] The allowable range of error (third error) between the measured mass value (third measured value) of the weighed coarse aggregate and the target mass of the coarse aggregate is, for example, from zero to ±3% of the target mass of the coarse aggregate. The allowable range of the error (fourth error) between the measured mass value (fourth measured value) of the weighed fine aggregate and the target fine aggregate mass is, for example, from zero to ±3% of the target fine aggregate mass.

[0055] The tolerance for the error (fifth error) between the measured mass of the weighed chemical admixture (fifth measured value) and the target mass of the admixture ranges, for example, from zero to ±3% of the target mass of the admixture. The tolerance range for the error (sixth error) between the measured mass value (sixth measured value) of the measured liquid (liquid containing water and chemical admixture) and the target water mass is, for example, from zero to ±1% of the target water mass. According to the present invention, the allowable ranges are not limited to the above-mentioned numerical examples.

[0056] (Quality control method for type A equivalent concrete) 2 is a flowchart showing a quality control method for Class A equivalent concrete according to an embodiment of the present invention. This quality control method may be performed using the quality control device 10 described above.

[0057] In step S1, the identification information of the Class A equivalent concrete to be produced, the first and second target masses, the coarse aggregate target mass, the fine aggregate target mass, the admixture target mass, and the water target mass are input to the weighing device 3 (controller 31). For example, this input may be made by a person operating an appropriate operation unit (touch panel, keyboard, etc.). Once this input is made, a metering start command may be input to the weighing device 3 (controller 31). This input may be made by a person operating an appropriate operation unit.

[0058] In step S2, upon receiving a weighing start command, the weighing device 3 performs weighing. That is, as described above, the weighing device 3 automatically measures Portland cement, blast-furnace cement type B, coarse aggregate, and fine aggregate into the first and second measuring devices 21 and 22, the coarse aggregate measuring device 23X, and the fine aggregate measuring device 23Y, respectively, based on the first and second target masses, the coarse aggregate target mass, and the fine aggregate target mass. As a result, the first and second measuring devices 21 and 22, the coarse aggregate measuring device 23X, and the fine aggregate measuring device 23Y enter a receiving completion state in which they have completed receiving the Portland cement, blast-furnace cement type B, coarse aggregate, and fine aggregate, respectively.

[0059] Furthermore, in step S2, when the measuring device 3 receives a measuring start command, as described above, based on the admixture target mass and water target mass, the measuring device 3 automatically measures the chemical admixture and water into the measuring device 24. As a result, the measuring device 24 enters a receiving completion state in which the receiving of the chemical admixture and water has been completed.

[0060] When step 2 begins, storage bottles 11a, 12a, coarse aggregate storage bottle 13a, fine aggregate storage bottle 13a, storage bottle 14a, and storage bottle 15a may each contain sufficient amounts of Portland cement, blast-furnace cement type B, coarse aggregate, fine aggregate, chemical admixtures, and water. Storage bottles 11a and 12a each contain Portland cement and blast-furnace cement type B produced by the same manufacturer. The Portland cement and blast-furnace cement type B stored in storage bottles 11a and 12a conform to their respective JIS standards.

[0061] In step S3, the weighing device 3 (error calculation unit 41) calculates the errors between the first to fourth measurement values ​​output from the first and second weighing devices 21, 22, the coarse aggregate weighing device 23X, and the fine aggregate weighing device 23Y in the acceptance completion state, and the errors between the fifth and sixth measurement values ​​obtained from the mass measurement values ​​from the weighing device 24. That is, the weighing device 3 (error calculation unit 41) calculates the error between the first measurement value and the first target mass, the error between the second measurement value and the second target mass, the error between the third measurement value (measured value of coarse aggregate) and the coarse aggregate target mass, the error between the fourth measurement value (measured value of fine aggregate) and the fine aggregate target mass, the error between the fifth measurement value (measured value of chemical admixture) and the admixture target mass, and the error between the sixth measurement value and the water target mass, respectively, as the first to sixth errors.

[0062] In step S4, it is confirmed whether the first error calculated in step S3 (the error between the measured mass of the Portland cement weighed and the first target mass) and the second error calculated in step S3 (the error between the measured mass of the blast-furnace cement type B weighed and the second target mass) are within the allowable range. If at least one of the first and second errors is outside the allowable range, the subsequent processing is stopped.

[0063] On the other hand, if both the first and second errors are within the allowable ranges, the process may proceed to step S5, or if all of the third to sixth errors (or a specific part of the third to sixth errors) are within the allowable ranges, the process may proceed to step S5. That is, in step S4, it may be confirmed whether the first to sixth errors (or a combination of the first and second errors and a specific part of the third to sixth errors) are within their respective allowable ranges.

[0064] Step S4 may be performed by the control unit 31 as follows. The control unit 31 determines whether the first and second errors (or the first to sixth errors, or a combination of the first and second errors with a specific part of the third to sixth errors) are all within the allowable range, and if the result of this determination is positive, the control unit 31 executes the processes from step S5 onwards. On the other hand, if the result of this determination is negative, the control unit 31 outputs an error signal to that effect and does not execute the processes from step S5 onwards. This error signal is output, for example, to an appropriate display, which then indicates that the errors are not within the allowable range. In this case, the weighing device 3 may be inspected and adjusted manually.

[0065] Alternatively, the control unit 31 outputs the first and second errors (or the first to sixth errors, or a combination of the first and second errors and a specific part of the third to sixth errors) to the display. As a result, the display displays these errors. If the person determines that each error displayed on the display is within the allowable range, the person inputs a command to execute the processing from step S5 onwards to the control unit 31 by operating an appropriate operation unit. As a result, the control unit 31 executes the processing from step S5 onwards. On the other hand, if the person determines that at least one of the first and second errors (or the first to sixth errors, or a combination of the first and second errors and a specific part of the third to sixth errors) displayed on the display is outside the allowable range, the person does not input a command to execute the processing from step S5 onwards to the control unit 31. In this case, the weighing device 3 may be inspected, adjusted, etc.

[0066] In step S5, the weighing device 3 (controller 31) stores the first to sixth measurement values, the first to sixth errors, the first and second target masses, the coarse aggregate target mass, the fine aggregate target mass, the admixture target mass, and the water target mass as quality data in the storage device 7 in association with the identification information input in step S1. This quality data may be kept in the storage device 7.

[0067] In step S6, the first and second measuring devices 21, 22, the coarse aggregate measuring device 23X, the fine aggregate measuring device 23Y, and the measuring device 24, which have completed the reception, are caused to supply Portland cement, blast-furnace cement type B, coarse aggregate, fine aggregate, chemical admixtures, and water to the mixer 5. This supply may be performed by the control unit 31 performing control to open the opening / closing gates 21c, 22c, 23c, 23c of the first measuring device 21, the second measuring device 22, the coarse aggregate measuring device 23X, and the fine aggregate measuring device 23Y, and to open the valve 24c of the measuring device 24.

[0068] In step S7, the mixer 5 produces Type A equivalent concrete by mixing the supplied Portland cement, blast-furnace cement Type B, coarse aggregate, fine aggregate, chemical admixtures, and water. The operation of the mixer 5 in step S7 may be initiated by the control unit 31. Alternatively, after performing step S6, the control unit 31 may output a signal to notify a person that this has been performed, and the person may operate the mixer 5 based on this signal.

[0069] The quality data stored in the storage device 7 in step S5 can be output to a display or a printer as needed after step S6. In this case, the output quality data is displayed on a display or printed on paper by a printer.

[0070] (Effects of the embodiment) According to this embodiment, the masses of Portland cement and Type B blast-furnace cement used to produce concrete equivalent to Type A blast-furnace cement are automatically measured, and the measured masses (first and second measurement values) are recorded in the storage device 7 as quality data in association with the identification information of the produced Type A-equivalent concrete. Therefore, the recorded quality data can ensure that the Type A-equivalent concrete has been produced in accordance with a predetermined mixing ratio of Portland cement and Type B blast-furnace cement. As a result, the required performance of the concrete can be guaranteed. For example, after producing Type A-equivalent concrete, its quality can be confirmed using the quality data and can be demonstrated to a third party.

[0071] Furthermore, in this embodiment, the Portland cement and the blast-furnace cement type B are not cumulatively weighed, but are measured using separate first and second measuring devices 21 and 22, respectively, and the measured mass values ​​of the Portland cement and the blast-furnace cement type B are obtained from the first and second measuring devices 21 and 22. In this way, the measured mass values ​​of the Portland cement and the blast-furnace cement type B are values ​​measured using separate measuring devices, and can therefore be presented as highly reliable and objective data (evidence).

[0072] Unlike the present embodiment, in the case of cumulative weighing, a first target mass of Portland cement is first measured using a scale. Next, by adding blast-furnace cement type B to the same scale, the total mass of cement, consisting of the first target mass and the second target mass of blast-furnace cement type B, is measured using the same scale. In this case, because each cement is measured using a single scale, it is difficult to provide reliable and objective evidence of the breakdown of the mass of the measured cement.

[0073] In this embodiment, the error between the measured mass of the weighed Portland cement and the first target mass, and the error between the measured mass of the weighed blast-furnace cement Type B and the second target mass are also recorded. The recorded errors allow the quality of the produced Type A equivalent concrete to be immediately confirmed.

[0074] The present invention is not limited to the above-described embodiment, and various modifications may be made within the scope of the technical concept of the present invention. For example, the following modifications may be adopted. In this case, the points not described below may be the same as those described above.

[0075] (Example of change) In step S5, the weighing device 3 (control unit 31) simply records in the storage device 7 as quality data at least the first and second measurement values ​​(respective mass measurement values ​​of the weighed Portland cement and blast-furnace cement type B) of the first to sixth measurement values ​​and the first to sixth errors in the above-described embodiment in association with the identification information input in step S1. For example, the weighing device 3 does not need to record the first to sixth errors in the above-described embodiment in the storage device 7 in step S5. In this case, the error calculation unit 41 need not be provided. [Explanation of symbols]

[0076] 3 Measuring device, 5 Mixer, 7 Storage device, 10 Quality control device, 11 First supply device, 11a Storage bottle, 11b Open / close gate, 12 Second supply device, 12a Storage bottle, 12b Open / close gate, 13X Coarse aggregate supply device, 13Y Fine aggregate supply device, 13a Storage, 13b Open / close gate, 14 Admixture supply device, 14a Storage bottle, 14b Valve, 15 Water supply device, 15a Storage bottle, 15b Valve, 21 First measuring instrument, 21a Measuring bottle, 21b Load cell, 21c Open / close gate, 22 Second measuring instrument, 22a Measuring bottle, 22b Load cell, 22c Open / close gate, 23X Coarse aggregate measuring instrument, 23Y Fine aggregate measuring instrument, 23a Measuring bottle, 23b Load cell, 23c Opening / closing gate, 24 measuring instrument, 24a measuring bottle, 24b load cell, 24c valve, 31 control unit, 41 error calculation unit

Claims

1. (A1) Portland cement having a mass percentage of blast furnace slag of 0% to 5% but difficult to specify which value between 0% and 5% it is, blast furnace cement type B having a mass percentage of blast furnace slag of 40% to 45% but difficult to specify which value between 40% and 45%, coarse aggregate, fine aggregate, liquid chemical admixture, and liquid obtained by mixing the chemical admixture and water are respectively set as a first target mass, a second target mass, a coarse aggregate target mass, a fine aggregate target mass, an admixture target mass, and a water target mass, and a control unit calculates the target masses of the Portland cement based on the measured mass of the Portland cement and the first target mass. the first measuring instrument measures the blast furnace cement Type B, the second measuring instrument measures the blast furnace cement Type B based on the measured mass of the blast furnace cement Type B and the second target mass, the coarse aggregate is measured with a coarse aggregate measuring instrument based on the measured mass of the coarse aggregate and the coarse aggregate target mass, the fine aggregate is measured with a fine aggregate measuring instrument based on the measured mass of the fine aggregate and the fine aggregate target mass, the chemical admixture is measured with a liquid measuring instrument based on the measured mass of the chemical admixture and the admixture target mass, and the liquid obtained by combining the chemical admixture and water is measured with the liquid measuring instrument based on the measured mass of the liquid and the water target mass, (A2) An error calculation unit calculates, as first to sixth errors, the error between the measured mass of the Portland cement and the first target mass, the error between the measured mass of the blast-furnace cement type B and the second target mass, the error between the measured mass of the coarse aggregate and the coarse aggregate target mass, the error between the measured mass of the fine aggregate and the fine aggregate target mass, the error between the measured mass of the chemical admixture and the admixture target mass, and the error between the measured mass of the liquid obtained by combining the measured chemical admixture and water and the water target mass, respectively; (A3) Check whether the first to sixth errors are within their respective allowable ranges; (B) Mixing the measured Portland cement, the blast furnace cement type B, the coarse aggregate, the fine aggregate, the chemical admixture, and the water in a mixer to produce concrete equivalent to blast furnace cement type A; (C) quality data for demonstrating the quality of the concrete to a third party, and recording the quality data for use in confirming the quality in a storage device; The quality data is data in which the mass measurement values ​​of the measured Portland cement, the blast-furnace cement type B, the coarse aggregate, the fine aggregate, the chemical admixture, and the liquid obtained by mixing the chemical admixture and the water, and the first to sixth errors are associated with identification information of the concrete, (D) After producing the concrete equivalent to Class A, demonstrate the quality of the concrete to a third party using the quality data, the first measuring device includes a measuring bottle for holding the Portland cement supplied by the first supply device, a load cell for measuring the mass of the Portland cement held in the measuring bottle, and an opening / closing gate for opening and closing a bottom opening of the measuring bottle to supply the measured Portland cement to the mixer, and outputs the mass measurement value of the Portland cement measured by the load cell; The second measuring device includes a measuring bottle for holding the blast-furnace cement Type B supplied by the second supply device, a load cell for measuring the mass of the blast-furnace cement Type B held in the measuring bottle, and an opening / closing gate for opening and closing the bottom opening of the measuring bottle to supply the measured blast-furnace cement Type B to the mixer, and outputs the mass measurement value of the blast-furnace cement Type B measured by the load cell; the coarse aggregate measuring device holds the coarse aggregate supplied by the coarse aggregate supply device and outputs the mass measurement value of the held coarse aggregate; the fine aggregate measuring device holds the fine aggregate supplied by the fine aggregate supply device and outputs the mass measurement value of the held fine aggregate; a measuring device for measuring the mass of the chemical admixture supplied by an admixture supply device, and outputting the mass measurement value of the chemical admixture being held; and a measuring device for measuring the water supplied by a water supply device, and outputting the mass measurement value of the liquid obtained by mixing the chemical admixture and water being held.

2. 2. A quality control method for concrete equivalent to blast-furnace slag cement Class A according to claim 1, wherein (B) is discontinued if at least any of the errors is outside the allowable range.

3. In (B), 2. The quality control method for concrete equivalent to Class A blast-furnace cement according to claim 1, wherein the Portland cement and the Class B blast-furnace cement are supplied to the mixer from the first measuring device and the second measuring device, respectively, the coarse aggregate and the fine aggregate are supplied to the mixer from the coarse aggregate measuring device and the fine aggregate measuring device, the chemical admixture and the water are supplied to the mixer from the liquid measuring device, and the Portland cement, the Class B blast-furnace cement, the coarse aggregate, the fine aggregate, the chemical admixture, and the water are kneaded together in the mixer to produce the concrete equivalent to Class A blast-furnace cement.

4. A quality control device for concrete equivalent to blast furnace cement type A, which is produced by mixing portland cement having a blast furnace slag mass percentage of 0% to 5% but which is difficult to identify as being a value between 0% and 5%, blast furnace cement type B having a blast furnace slag mass percentage of 40% to 45% but which is difficult to identify as being a value between 40% and 45%, coarse aggregate, fine aggregate, a liquid chemical admixture, and water, a measuring device that measures target masses of the Portland cement, the blast-furnace cement Class B, the coarse aggregate, the fine aggregate, the chemical admixture, and the liquid obtained by mixing the chemical admixture and the water based on the first target mass, the second target mass, the coarse aggregate target mass, the fine aggregate target mass, the admixture target mass, and the water target mass, respectively; a mixer to which the measured Portland cement, the blast-furnace cement Type B, the coarse aggregate, the fine aggregate, the chemical admixture, and the water are supplied and which kneads the Portland cement, the blast-furnace cement Type B, the coarse aggregate, the fine aggregate, the chemical admixture, and the water; and a storage device that generates and stores quality data for use in confirming the quality of the concrete, the quality data being used to show the quality of the concrete to a third party after the concrete equivalent to Class A is manufactured; The metering device is a first weighing device that includes a measuring bottle that holds the Portland cement to be supplied, a load cell that measures the mass of the Portland cement held in the measuring bottle, and an opening / closing gate that opens and closes the bottom opening of the measuring bottle to supply the measured Portland cement to the mixer, and that outputs the mass value of the Portland cement measured by the load cell; a second measuring device that includes a measuring bottle that holds the blast-furnace cement Type B to be supplied, a load cell that measures the mass of the blast-furnace cement Type B held in the measuring bottle, and an opening / closing gate that opens and closes the bottom opening of the measuring bottle to supply the measured blast-furnace cement Type B to the mixer, and outputs the mass measurement value of the blast-furnace cement Type B measured by the load cell; a first supply device that supplies the Portland cement to the measuring bottle of the first measuring device; a second supply device that supplies the blast-furnace cement type B to the measuring bottle of the second measuring device; a coarse aggregate weighing device that holds the supplied coarse aggregate and outputs a mass measurement value of the held coarse aggregate; a fine aggregate weighing device that holds the supplied fine aggregate and outputs a mass measurement value of the held fine aggregate; a coarse aggregate supplying device that supplies the coarse aggregate to the coarse aggregate measuring device; a fine aggregate supplying device that supplies the fine aggregate to the fine aggregate measuring device; a liquid meter that holds the supplied liquid and outputs a mass measurement value of the held liquid; an admixture supply device that supplies the chemical admixture to the liquid meter; a water supply device that supplies the water to the liquid meter; a control unit that controls the first supply device, the second supply device, the coarse aggregate supply device, and the fine aggregate supply device so that the measured mass values ​​of the Portland cement, the blast-furnace cement type B, the coarse aggregate, and the fine aggregate respectively become the first target mass, the second target mass, the coarse aggregate target mass, and the fine aggregate target mass, and also controls the admixture supply device so that the measured mass value from the liquid meter becomes the admixture target mass, and then controls the water supply device so that the measured mass value from the liquid meter becomes the water target mass; an error calculation unit that calculates, as first to sixth errors, the error between the measured mass of the Portland cement and the first target mass, the error between the measured mass of the blast-furnace cement type B and the second target mass, the error between the measured mass of the coarse aggregate and the coarse aggregate target mass, the error between the measured mass of the fine aggregate and the fine aggregate target mass, the error between the measured mass of the chemical admixture and the admixture target mass, and the error between the measured mass of the liquid obtained by mixing the measured chemical admixture and the water and the water target mass, The quality data is data in which the mass measurement values ​​of the measured Portland cement, the blast furnace cement type B, the coarse aggregate, the fine aggregate, the chemical admixture, and the liquid obtained by mixing the chemical admixture and water, and the first to sixth errors are associated with identification information of the concrete, in a quality control device for concrete equivalent to blast furnace cement type A.

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