JPS6292810A - Manufacture of hydraulic curing material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a hydraulic hardening raw material for obtaining concrete, mortar, etc. with high strength (with little variation).

In the production of cow concrete and fresh mortar using conventional techniques, the water content and water absorption rate of the aggregate differs during use, so even if the mixture is mixed at the same ratio, the cement and water, excluding the aggregate, are mixed in the mixing process. The ratio changes, which makes it difficult to adjust the slump value to a desired slump value, and there is a drawback that the strength of conocrete or mortar after hardening varies. On the other hand, slump meters are commercially available, but they merely detect the slump value during kneading, and do not adjust the slump value to a desired slump value.

The object of the present invention is to provide a method for producing a hydraulic curing raw material that adjusts the kneading resistance value or slump value to a desired value, and the method for producing a hydraulic curing raw material of the present invention in accordance with the above-mentioned object. is a mixer with a rotating shaft equipped with stirring blades.The mixer is used to add hydraulic powder to aggregates that have absorbed enough water, mix them, and allow the hydraulic powder to absorb excess water in the aggregates. 1.Continue kneading, and then detect the kneading resistance value or the corresponding slump value7. If the resistance value or slump value is different from the desired value, add water and a water reducing agent in an amount corresponding to the above-mentioned kneading resistance value or slump value determined in advance from experimental values or calculated values.

The kneading resistance value or slump value can be adjusted to the desired value by adding a fluidity enhancer such as a fluidizer or by acting on the air flow for a time determined by experimental or calculated values to promote water vaporization. It is characterized by adjustment.

The present invention will be described in detail below with reference to the accompanying drawings. In this invention, hydraulic powder refers to powder of substances that harden by reacting with water, such as cement, gypsum, and water slag, and hydraulic hardening material refers to a mixture of hydraulic powder and water or aggregate. Aggregate refers to coarse aggregate or fine aggregate, experimental values include actually measured values and test values, and fluidity enhancers also include dispersants.

Further, the amount or time corresponding to the kneading resistance value or slump value refers to the amount of fluidity increasing agent required to obtain the desired kneading resistance value or slump value, or the time for acting on the air flow.

FIG. 1 shows an example of an internal mixer (hereinafter simply referred to as a mixer) suitable for the present invention. MIKI G-A has a built-in rotating shaft 1a equipped with stirring blades 1b, and an intermittent feeding device 1 on the top.
d is equipped with an intermittent discharge device at the bottom! The main parts are a closed container 1 equipped with an RLC, a vacuum suction device 2, a compressor 3, and a gas-liquid separator 4, and 7.5 is a pipe with a pulp 5a connecting the upper part of the closed container 1 and the vacuum suction device @2, and 6 is a pipe with a pulp 5a. A pipe with a pulp 6a branched into the pipe 5, 7 a pipe with a pulp 7a connecting the pipe 5 and the gas-liquid separator 4, and 8 a valve 8 connected to the gas-oil separator 4.
9 is a pipe with a pulp 9a attached to it, which is connected to the lower part of the airtight container 1 through a filter, and 7 is connected to the vapor separator 4.
10 is a FW with a valve 10a branched from the pipe 9; 11 is a valve 10 connecting the compressor 3 and the upper part of the closed container 1;
With a? A pipe 12 is a pipe with a valve 12a branched from the pipe 11, 13 is connected to the lower part of the sealed container via a filter, a pipe with a pulp 13a connected to the pipe 11, and 14 is connected to the upper part of the sealed container 1.・Pulp l 4 a
It is a tube with a tube attached.

Fig. 2 shows an example of an automatic adjustment control system diagram of the slump value using the above-mentioned mixer A, and 15 is the rotation axis 1 of the mixer A.
16 is the prime mover that drives the prime mover 15 to the mixer A.
This is a torque detector that detects the torque transmitted to. 1
7 is a converter that converts the signal from the torque detector 16 into a signal that can be input to the calculator 18. Based on the signal from the converter 17, the calculator 18 converts the hydraulic hardening raw material being kneaded in the mixer A. It is configured to be able to calculate the slump value of. Note that 18' is a display that displays the slump value during kneading based on the signal from the calculator 18. 19 is arithmetic unit 1
The slump value of the hydraulic hardening raw material during kneading calculated in step 8 is compared with the target slump value set in advance in the slump setting device 24, and the slump value of the hydraulic hardening raw material during kneading is the target value or This is a comparator that determines whether the value is within the allowable range, exceeds the value, or falls below the value. If the slump value of the hydraulic hardening raw material during kneading is at the target value or within its allowable range (desired slump value), the comparator 19 sends a signal indicating completion of slump adjustment to the kneading control device 20, and the hydraulic hardening raw material is The mixture is discharged from mixer A and then placed on standby until the next mixing step. Note that the comparator I9 checks the difference between the slump value calculated by the calculator 18 and the target value preset in the setting device 24,
Depending on the difference, how much fluidity enhancer should be added,
Also, how long should the fluidity enhancer be applied to the air flow to bring the slump value to the target value? In other words, the amount of fluidity enhancer added corresponding to the slump value and the time for it to be applied to the air flow are determined.
If the slump value stored based on experimental values or calculated values and calculated by the calculator 18 exceeds the allowable range of the target value, that is, when the hydraulic curing raw material is too soft, slump control is performed. A signal is sent to the device 21 indicating how long the airflow should be generated, and a signal is sent to the slump lowering processing device 22 & the signal is sent to generate the airflow for a predetermined period of time, and the slump value is adjusted to the target value or its allowable range. Adjust within. In addition, if the slump value calculated by the calculator 18 is below the allowable range of the target value, that is, if the hardening raw material is too hard, a signal indicating how much fluidity increasing agent should be added is sent from the comparator 19 to the nulumb. It is sent to the control equipment 21, and further to the slump rise processing equipment fj! 23 to add a predetermined amount of fluidity enhancer and adjust the slump value to the target value or within its acceptable range. In any case, when producing a hydraulic curing raw material whose 0 slump value is larger than the slump value calculated by the calculator, a slump lowering processing device is not necessary. When collecting water-sand curing raw materials with a small resistance value or a large resistance value, a slump raising treatment device is not necessary. 25 in the figure is a liquid supply pipe.

The above describes a method for automatically adjusting the slump value to a desired slump value by detecting the torque value of the rotating shaft 1a.
However, when the prime mover is an electric motor, its current value can be extracted and the slump value can be adjusted to a desired slump value. In this case, the quality converter 17 becomes a converter that converts a signal from a current value detector of the motor into a signal that can be input to the arithmetic unit 18. Furthermore, when using a hydraulic motor, the slump value can be adjusted to a desired slump value by detecting the pressure of the hydraulic motor. In this case, the converter 17 becomes a converter that converts a signal from the pressure detector of the hydraulic motor into a signal that can be input to the calculator 18. Furthermore, when using a hydraulic motor, the slump value can be adjusted to a desired slump value by detecting the rotational speed of the rotating shaft of the mixer or the rotating shaft of the hydraulic motor that drives the mixer. In this case, the converter 17 is a converter that converts the signal from the tachometer attached to the rotating shaft into a signal that can be input to the calculator 18. The slump value is determined by excluding the aggregate in the hydraulic curing raw material (water This method manually measures the fluidity, which changes depending on the ratio of powder and hydraulic powder, and not only is the measured value inaccurate, but it is also 0.
Excluding the aggregate in the hydraulically hardened raw material at the slump value (the ratio of water and hydraulic powder cannot be measured), the torque value, current value, pressure, rotation speed, etc. According to experimental results, the kneading resistance value is correlated with the slump value, and since the resistance value can be measured more accurately than the slump value, it is necessary to convert the resistance value to the slump value. In this way, the difference in the ratio of water excluding aggregate in the hydraulic hardening raw material and hydraulic powder at 0 slump can be measured. When displaying slump values, it is possible to measure the negative slump value.

FIG. 3 shows an example of a device for driving the rotating shaft 1a of mixer A with a hydraulic motor 30, 26 is an oil tank for storing hydraulic oil, 27 is a hydraulic pump driven by a prime mover 28, and the hydraulic pump 27 is Variable displacement with torque control that automatically adjusts the discharge amount in proportion to load fluctuations and based on changes in oil pressure so that the output of the prime mover 28 approaches a constant value (for example, full load) in response to load fluctuations. It is a type.

29 transfers the pressure oil generated by the hydraulic pump 27 to a hydraulic motor 30.
This is a hydraulic switching valve for supplying oil to the oil tank 26 or returning it to the oil tank 26, that is, for operating and stopping the hydraulic motor 30. The hydraulic switching valve 29 can be manually operated, hydraulically operated, or electrically operated. It's okay. The rotating shaft 1a of the mixer A is driven by the hydraulic motor 30.
A tachometer 31 is provided to detect the rotational speed of 0a.

When the prime mover 28 is operated with the above device, the hydraulic pump 27
is driven, sucks in the hydraulic oil in the oil tank 26, and generates pressure oil. Therefore, when the hydraulic switching valve 29 is switched to the operating side, pressure oil is supplied to the hydraulic motor 30, and the hydraulic motor 3
By moving 0, the rotating shaft of the mixer connected to it rotates. The above device changes the discharge amount of the hydraulic pump 27 depending on the pressure of the hydraulic circuit while mixing the hydraulic curing raw material in the mixer A, and detects the rotation speed of the rotating shaft 1a or 30a that changes accordingly, with a tachometer 31G. It is.

FIG. 4 shows another example of the installation 7, in which the functions of the hydraulic pump 27 and hydraulic motor 30 of the device shown in FIG. 3 are reversed. In other words, is it a hydraulic pump in Figure 3? 7 is configured to change the rotation speed of the hydraulic motor 30 by changing the discharge amount of the hydraulic pump 27' depending on the discharge pressure, but in the device shown in FIG. The rotation speed of the hydraulic motor 30' is configured to change depending on the pressure in the hydraulic circuit that changes depending on the kneading resistance of mixer A, and in either case, the rotation speed of the rotating shaft is changed depending on the kneading resistance of mixer A. do not have.

Next, the method for producing the hydraulic curing source and material will be explained.

In FIG. 1, the prime mover is operated with all the pulp, supply device 1d, and discharge device tc closed, and the rotating shaft 1a is
is rotated, the supply device 1d is opened, and the fine aggregate or coarse aggregate is put into the closed container 1, and water is supplied from a liquid supply pipe (not shown) and stirred. Next, when the supply device 1d is closed, the pulp 5a is opened, and the vacuum suction device 2 is activated, the pressure inside the sealed container 1 is reduced, and when the desired degree of vacuum is reached, the pulps 6a and 14a are opened and the pulp 5a is closed, making the container airtight. The inside of the container 1 returns to normal pressure. Subsequently, when the pulp 5a is opened and the pulps 6a and 14a are closed, the pressure inside the closed container 1 is reduced again. When the pressure is changed one or more times in the manner described above, the aggregate becomes sufficiently hydrated. Next, from a normal pressure state, for example, when pulp 5a is closed and pulps 6a and 14a are open, pulp 6a is closed and pulps 7a and 9a are opened (then the inside of the sealed container 1 is vacuumed through pipes 9 and 7, and water is When it accumulates, it rapidly flows into the gas-liquid separator 4. Next, the pulp 6a is opened, the pulps 7a and 9a are closed, and the pulp 8a is opened (
Then, the inside of the closed container 1 returns to normal pressure, and the water in the gas-liquid separator 4 is discharged to the outside. This method not only allows the aggregate to absorb sufficient C water, but also removes salt from sea sand and removes mud from mountain sand. If water does not accumulate in the closed container l, the above operation is omitted. Next, when the supply device 1d is opened and cement is supplied and kneaded, the cement absorbs the excess water in the aggregate, and the aggregate is either sufficiently hydrated or moist, but no water oozes out. Become. Then, the device checks the difference between the slump value and the set slump value at this time or after a certain period of time, for example, 10 seconds, continues kneading, and determines whether to supply an amount of fluidity enhancer according to the difference or not. The slump value is adjusted to a desired slump value by generating an air flow for a time corresponding to the time to promote water vaporization, and then the discharge device IC is opened to discharge the hydraulic curing raw material. Note that in order to cause an air flow to reduce the slump value (increase the resistance value), it is necessary to create an air flow within the closed container 1.

For example, when pulps 14a + 9a v 7a are opened and the vacuum suction device 2 is activated, outside air is introduced from pipe 14, creating an air flow through the closed container l towards pipes 9 and 7, and pulps 10a and 5a are opened. When the vacuum suction device 2 is activated, outside air is introduced from the tube 10 and passes through the closed container 1 into the tube 5.
An airflow is created towards. When the above operations are performed alternately, the tube 9
Even if the filter installed at the attachment point to the closed container l becomes clogged, the clogging can be eliminated. The air flow from the pipe 14 to the pipe 9 promotes the vaporization and discharge of water7, and the air flow from the pipe 10 to the pipe 5 promotes the vaporization and discharge of water2, both of which reduce the slump value. Or you can increase the resistance value.If you use a compressor 3, the airflow will flow from pipe 13 to r, pipe 9, pipe 5, or pipe 14, and from pipe 11 to pipe 9 or ?? 5, these air flows are effective in discharging water or vaporizing water, and can reduce the slump value (reduce the resistance value).

The method for producing a hydraulic curing raw material of the present invention has been described above, but the present invention is not limited to the examples and can take the following embodiments.

(1) As the mixer, in addition to the illustrated horizontal shaft forced stirring mixer, a vertical shaft forced stirring mixer can be used.

(2) Pressure change is not limited to depressurization → repressurization (pressure change may be due to pressurization → repressurization. Pressure change due to pressurization → repressurization is similar to the operation of depressurization → repressurization). A detailed explanation of the operation will be omitted, as it can be carried out by hand.

(3) To increase the slump value (reduce the resistance value), a fluidity enhancer can be added by spraying or it can also be added as vapor.

(4) The water or fluidity enhancer used in the production of the hydraulic curing raw material can be used by heating it.

(5) The aggregate has a high water absorbency and does not require a pressure change (if the aggregate is sufficiently hydrated just by adding water, the pressure change can be omitted).

(6) To make the aggregate absorb enough water, put the aggregate in a closed container and stir or reduce the pressure without stirring. You can also let it absorb water.

(7) Two mixers are used; one mixer washes the aggregate with water, removes salt from sea sand, and produces aggregate that is sufficiently hydrated, while the other mixer performs hydraulic hardening. -C, which produces hardening raw materials, is also good. The mixer in this case may be a commercially available mixer equipped with a slump adjustment device. 2. The above mixer is a two-stage type. The aggregate containing water may be produced in the upper mixer (l) and then transferred to the lower mixer to produce a hydraulic hardening raw material.

(The 81 Hakisar does not necessarily require both a vacuum suction device and a compressor; it may be equipped with only one. Also, a blower may be used to generate air flow.

This invention is constructed as described above, and since hydraulic powder is added to the water-containing aggregate to absorb excess water in the aggregate (water that normally oozes from the aggregate), the aggregate is sufficiently hydrated. Alternatively, the aggregate has an appropriate water content that is moist but does not allow water to seep out under normal conditions, and after forming, water comes out from the bone phase and the aggregate periphery [
(The water contained in the aggregate is effectively used for the initial hydration reaction, and the long-term strength is 1°C if only the initial strength is 1. It is also possible to simplify or omit the filter function. When hot water is used, the bone phase can supply temperature and accelerate hardening, and the bone phase can also be used to increase the appropriate moisture content of the aggregate. The water retention rate is almost constant, and since the hydraulic powder covers the aggregate, even if a fluidity enhancer is added, it is difficult to be absorbed by the aggregate, and when the hydraulic powder is added and kneaded. The amount of fluidity enhancer added after the slump can be calculated not only by experimental values but also by calculation, which makes it easy to control slump adjustment, and it is possible to calculate the ratio of hydraulic powder excluding aggregate and water at 0 slump. It has many effects such as being able to adjust to a desired ratio (adjusting to a desired resistance value).

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of an example of a mixer, and FIG. 2 is a diagram showing an example of an automatic adjustment control system for a slump value. 3 and 4 are diagrams showing two examples of mixer drive systems. Patent Applicant Hiroshi Mitsuo, Representative Director of Mitsuo Research Institute Co., Ltd. Hiroshi Mitsuo Jiro wa Bunbe Song Ki Q b 1 Y 2 Eyes 2 Da 8 Enduchi Office Hair'Rakudo ÷ 1 Masa X) Lx- Keihiro UQ: bt)-23) No. 322 2
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Claims (3)

[Claims] (1) Using a mixer with a rotating shaft equipped with stirring blades, hydraulic powder is added to aggregates that have absorbed sufficient water and kneaded, allowing the hydraulic powder to absorb excess water in the aggregates. The material is sufficiently hydrated,
Alternatively, the kneading resistance value or the corresponding slump value is detected while the kneading process is continued while the kneading resistance value or the slump value is different from the desired value. When mixing, add fluidity enhancers such as water, water reducer, and fluidizer in an amount corresponding to the kneading resistance value or slump value determined in advance based on experimental or calculated values, or A method for producing a hydraulic curing raw material, which comprises adjusting the kneading resistance value or slump value to a desired value by acting on an air flow for a time determined by the calculated value and promoting the vaporization of water. (2) Aggregates that have absorbed sufficient water are either made by applying a pressure change with gas to the aggregates and water being stirred in a closed mixer, or by impregnating the aggregates with water, or by placing them in a closed container. Claim 1 is characterized in that aggregate is placed therein, the pressure is reduced, water is poured into the closed container while the pressure continues to be reduced, and the pressure is restored to impregnate the aggregate with water. A method for producing hydraulic curing raw materials. (3) To detect the kneading resistance value, the torque value of the mixer's rotating shaft, the current value of the electric motor that drives the rotating shaft, the pressure of the hydraulic motor that drives the rotating shaft, or the hydraulic pressure that drives the mixer's rotating shaft. The method for producing a hydraulic curing raw material according to claims 1 and 2, wherein the detection is performed based on the rotational speed of a rotating shaft of a motor.