JP2015150880A - Bulk mix method and bulk mix device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulk mix method capable of improving a bleeding ratio and improving strength in concrete and mortar by reducing cement accumulation.SOLUTION: In the mixing method of the present invention, a predetermined amount of aggregate consisting of fine aggregate and coarse aggregate is charged into a mixer and water to be compounded is added to the mixer so as to carry out a first mixing. Then, a second mixing is carried out by adding hydraulic powder comprising cement etc. to the mixer to produce concrete or mortar. Thereby, concrete or mortar having a lower bleeding ratio than that of a conventional example and reduced cement accumulation may be produced.

Description

  The present invention relates to a kneading method and a kneading apparatus for supplying blended water necessary for producing concrete or mortar before charging hydraulic substance powder.

  Conventionally, as a method for producing concrete or mortar, a batch mixing method is generally employed in which cement and water are added to aggregates and mixed together. The batch kneading method is simpler to manufacture than the split kneading method in which the blended water is divided into primary water and secondary water and supplied and kneaded as shown in Patent Document 1. Can be manufactured in a short time. However, it is known that the batch mixing method results in mortar or concrete having relatively large variations in bleeding rate and strength and relatively low strength. In addition, the slurry-like cement which added the mixing water to the cement and kneaded is called cement paste.

  In such a concrete manufacturing method using the batch mixing method, various manufacturing methods have been proposed in order to improve the strength of the concrete. For example, in the concrete described in Patent Document 2, the strength of concrete is increased by mixing cement with an admixture composed of at least one of pozzolans or latent hydraulic substances and coarse limestone aggregate. Has been proposed.

Further, as another means for improving the strength of the concrete or mortar to be manufactured, there is an idea that pays attention to the bleeding characteristics of cement paste. Since the concrete and mortar bleeding occurs when the water of the cement paste is separated, the strength of the concrete and mortar is affected by the bleeding properties of the cement paste. That is, the smaller the bleeding rate of cement paste, the better the strength of concrete and mortar.
Bleeding water generated after kneading rises while making waterworks between concrete and mortar aggregates. A part of this remains constrained on the lower surface of the aggregate before reaching the top surface, and causes a defect (such as a microcrack) at the interface of the lower surface of the aggregate after hardening, thereby reducing the compressive strength. Therefore, the strength of concrete and mortar can be improved as the bleeding rate of the cement paste is smaller.

  In a general method for producing concrete or mortar, aggregate, hydraulic material powder such as cement, and necessary blended water are supplied uniformly at the same time and mixed. The bleeding rate of cement paste in which cement C and compounded water W are mixed so that, for example, W / C = 50% as in the case of such a batch mixing method (in the case of cement paste, bleeding water is used). The present inventors have confirmed that the ratio of the cement paste volume, which is a kneaded product to the volume, is about 8%.

  Normally, when concrete is produced by the batch mixing method, as a mixing procedure, the aggregate that takes a long time to be charged is first added, and then the entire amount of cement and compounded water is added while stirring with a mixer. Yes. Here, paying attention to cement and water, immediately after the addition, excessive water encounters the local cement of the kneaded material and mixing is started. While stirring, the water concentration is gradually uniform from the cement paste part where the water is more than the water cement ratio of the blend to the adjacent water part where the water moves away from the cement paste and further mixing, and gradually getting closer to the water cement ratio of the blend. And fluidity required for fresh concrete can be obtained.

Japanese Patent No. 4249176 Japanese Patent Laid-Open No. 2002-87866

  By the way, in concrete by such a batch mixing method, the bleeding rate (in the case of concrete, the ratio of the total blended water to the bleeding water) is 2 when the water cement ratio (W / C) is 55%. When 7% and the water cement ratio (W / C) was 65%, the bleeding rate was 3.4%, and the bleeding rate was relatively large. In such a batch kneading method, not only the bleeding rate is large, but also in the initial stage of kneading, the ratio of water is biased with respect to the cement, and there is a case where an unfavorable state such that a lot of cement lumps occur. For this reason, there is a drawback that the strength of the concrete varies due to the large bleeding rate and the occurrence of cement lumps, and the concrete does not fully develop.

  In view of such circumstances, an object of the present invention is to provide a kneading method and a kneading apparatus that can improve the bleeding rate and can eliminate the use of cement and improve the strength of concrete and mortar. .

The kneading method according to the present invention is a kneading method in which a mortar or concrete is produced by adding and mixing aggregate, a hydraulic substance powder such as cement and the necessary blended water, respectively, and adding blended water to the aggregate. And a second kneading step in which the hydraulic substance powder is added and kneaded.
According to the kneading method according to the present invention, the entire surface of the aggregate can be evenly and evenly distributed with water by adding the premixed water to the aggregate in advance and mixing first, and then wet. When a hydraulic substance powder such as cement is supplied to the second kneaded mixture and the water on the aggregate surface is mixed with the cement powder lump, the water-cement ratio is smaller than the capillary state. It can be inferred that many parts are generated, and by mixing them, the cement kneaded material comes into contact with the aggregate surface without cement and the water cement ratio gradually increases while the cement powder spreads, and the water cement ratio is increased. It becomes uniform (see FIG. 1). In this process, the bleeding ratio can be improved by increasing the portion where the kneaded cement is mixed from the phenicular state to the capillary state.

Here, in the kneading method according to the present invention, it will be described that the kneading method in which the cement paste, which is the main factor for occurrence of bleeding in concrete and mortar, reduces the bleeding rate from the phenicular state to the capillary state.
In the paste of cement and water, the bleeding rate and some of the blended water in the kneading method in which the remaining blended water is added to the kneaded product that has been kneaded by supplying a portion of the blended water (initial water) and mixed ( The relationship with (initial water) is shown in FIG. In the graph shown in FIG. 2, when the ratio W1 / C between some blended water (initial water) and cement is about 25%, the bleeding rate takes a minimum value. The kneaded material kneaded at a water cement ratio (W1 / C) of about 25% is called a capillary state.
From this, it can be seen that the bleeding rate of the slurry paste once kneaded in the capillary state takes a minimum value.

 First, the water cement ratio W / C of the paste is kneaded in a phenical state of less than 25%, and the water cement ratio W / C is increased by adding water while kneading. When capillary kneading at 25%, for example, the bleeding rate of the slurry-like paste with W / C = 50% is maintained at a minimum value, and the first blended water (initial water) has a water-cement ratio W / C of It exhibits a phenomenon that the bleeding rate is smaller than that of the paste that is kneaded by setting the slurry in a non-capillary state exceeding 25%.

This will be described with reference to FIG. 3, which shows the results of tests conducted to confirm this.
In FIG. 3, a part of the blended water is added and mixed, and then the water is added to the mixture several times, and the added blended water cement ratio (Wn / C) and water and cement Shows the bleeding rate of the paste in which water was added and kneaded at the end so that the ratio of W / C = 50%.
For example, as shown in the legend of FIG. 3, the case where the ratio W / C of some of the initially added blended water (initial water) and cement is set to three types of 10%, 30%, and 35% will be described. . In this case, in FIG. 3, in the case of W / C = 10%, a part of the blended water (Wn) is first added to the cement so that the water-cement ratio is Wn / C = 10%. Kneaded. Then, a part of the kneaded product of Wn / C = 10% is taken out, and the remaining water (W-Wn) is divided into several portions or continuously added thereto to perform secondary kneading. The bleeding rate of the obtained cement paste with W / C = 50% was 7.1%.

Next, the remaining water-cement ratio Wn / C = 10% cement paste was further added to 5% of the cement amount and kneaded. Then, a part of the kneaded product of Wn / C = 15% is taken out, and the remaining blended water (W-Wn) is added thereto and kneaded, and the resulting cement paste of W / C = 50% is obtained. The bleeding rate of was 3.5%.
In such a procedure, the blended water is sequentially added to the kneaded product and kneaded. In each case, a part of the kneaded product is taken out and the remaining blended water is added and kneaded. The bleeding rate of C = 50% cement paste was determined and plotted on the graph shown in FIG. In addition, the horizontal axis of the figure is the ratio (Wn / C) of the accumulated primary water amount (Wn) and cement (C) watered by 5% each, and the vertical axis is the bleeding of the cement paste obtained by adding all the blended water. Rate.

FIG. 3 shows the relationship between the cement paste bleeding rate when the water-cement ratio Wn / C = 30% and 35% of the mixed water initially added in the same procedure.
If the amount of water added initially is smaller than when Wn / C = 25% (capillary state), the bleeding rate is reduced by gradually adding water and kneading, and a capillary with Wn / C = 25% Even if it increases past the state, the bleeding rate does not increase from the minimum value but maintains the minimum value.
On the other hand, if the amount of the first water is larger than W / C = 25% (capillary state) such as Wn / C = 30% or 35%, the bleeding rate is larger than the minimum value of W / C = 25%. Presents a phenomenon.

Therefore, when a hydraulic substance powder such as cement is kneaded with water to form a paste, the ratio W / C between the hydraulic substance powder and the initially supplied blended water is 25% or less, or 25 It can be said that the bleeding rate (amount) of the cement paste obtained by further adding water is determined depending on whether the percentage exceeds 50%.
That is, when the remaining blended water is gradually added while kneading these aggregates and the blended water from the phencular state where W / C = 25% (capillary state) or less blended water is added, W / C Even if the cumulative amount of blended water is greater than 25% (capillary state) (this state is referred to as a slurry state), the bleeding rate does not increase compared to the capillary state.

From the results shown in FIG. 2 and FIG. 3, as in the conventional batch kneading method, when all the amount of blended water and cement are put into the mixer at the same time, the water mass and cement are encountered, and there are many parts that are kneaded in a slurry state. Therefore, the bleeding of this part cannot be reduced.
On the other hand, when the blended water is evenly distributed on the surface of the aggregate and cement is encountered in a part of the aggregate in the form of a conglomerate, there are many parts in a phenicular state where the water cement ratio W / C is less than 25% it can. Furthermore, mortar and concrete having a small bleeding rate can be produced in the process of uniformly dispersing the blended water by mixing and adding the remaining blended water.

  Therefore, when a hydraulic substance powder such as cement is kneaded with water to form a paste, the ratio W / C between the hydraulic substance powder and the initially supplied blended water is 25% or less, or 25 It can be said that the bleeding rate (amount) of the cement paste obtained by adding the remaining blended water while further kneading is determined depending on whether the amount exceeds 50%.

Further, the kneading apparatus according to the present invention is a kneading apparatus for producing mortar or concrete by adding the aggregate, the hydraulic substance powder such as cement, and the necessary blended water to the mixer, respectively, and kneading the aggregate. It has the 1st supply means which adds mixing water to a mixer, and the 2nd supply means which adds hydraulic substance powder to a mixer, It is characterized by the above-mentioned.
According to the present invention, the first supply means adds the aggregate and blended water into the mixer and mixes it first, so that the water can be evenly distributed over the entire surface of the aggregate, and then the cement is added. By adding the hydraulic substance powder to the mixer by the second supply means and mixing the mixture with the second, the uniform water on the aggregate surface and the lump of cement powder are mixed, and the water cement ratio is smaller than the capillary state. Many parts of the curled state occur, and the cement kneaded material comes into contact with the water-free aggregate surface without cement, and the cement powder spreads while gradually increasing the water-cement ratio, making the water-cement ratio uniform. To improve the bleeding rate.

 In the kneading method and the kneading apparatus according to the present invention, the first kneading and the second kneading may be performed continuously, or the hydraulic substance powder may be supplied during the kneading process. . Alternatively, the kneading process may be interrupted between the first kneading and the second kneading, and the hydraulic substance powder may be charged into the mixer during that time.

 According to the kneading method and the kneading apparatus according to the present invention, first, the aggregate and the mixed water are first kneaded to distribute the water evenly over the entire surface of the aggregate, and then the hydraulic substance such as cement is added. High strength concrete and mortar with reduced bleeding rate can be produced by adding the mixture and further kneading the mixture.

It is a flowchart which shows the mixing method by embodiment of this invention. FIG. 2 is a view showing the principle of the present invention and showing a relationship between an initial water cement ratio and a bleeding ratio of a paste at a water cement ratio of 50%. FIG. 2 is a view showing the principle of the present invention and showing a relationship between a cumulative water cement ratio and a bleeding ratio of a paste at a water cement ratio of 50%. It is a schematic block diagram which shows the kneading apparatus by embodiment of this invention. It is a block diagram of the control part which performs kneading in the kneading apparatus shown in FIG. It is a figure which shows the bleeding rate in concrete in the lump mixing method by embodiment of this invention, and a prior art example.

First, the principle of the mixing method according to the embodiment of the present invention will be described.
Mortar and concrete having a low bleeding rate are known to have high strength because they exhibit excellent properties such as excellent fluidity during vibration and are difficult to separate. Therefore, the bleeding rate is an important factor as an indicator of the quality of mortar and concrete. In particular, in general batch mixing method, mortar and concrete obtained by mixing and mixing aggregate, cement and total amount of water W at once are easier to manufacture than split mixing method. Moreover, although it can be produced in a short time, it is known that the bleeding rate is relatively large and the strength is relatively small.

Even with such a generally used mortar or concrete batch mixing method, according to the mixing method of the present invention, a mortar or concrete having a low bleeding rate and a small amount of cement can be obtained.
That is, in the kneading method according to the present invention, as shown in the flow chart of FIG. 1, first, an aggregate that takes a long time to be charged is first charged, and the total amount of the mixed water is charged to the aggregate to perform the first mixing. . As a result, water uniformly adheres to the entire surface of the aggregate.

Next, when the hydraulic material powder C such as cement is put into the mixer and second mixing is performed, the water uniformly adhered to the aggregate surface and the hydraulic material powder containing the cement are mixed together, It is considered that a portion where the cement ratio W / C is smaller than the capillary state is generated, and when these are agitated, the cement kneaded material comes into contact with the surface of the aggregate having no cement or a small amount of cement, while increasing the water cement ratio. The body spreads and the water cement ratio W / C becomes uniform. In this process, the portion where the kneading into the capillary state is increased increases the bleeding rate and eliminates cement waste.
Such a kneading method is called an aggregate / water kneading method.

In the kneading method according to the present invention, since the aggregate and water are well kneaded before the hydraulic substance powder such as cement is added to the aggregate, the water uniformly adheres to the entire aggregate surface. Mix well with hydraulic powder, improve bleeding rate, reduce cement lumps, and effectively hydrate the cement to improve mortar or concrete properties .
The amount of blended water in the first kneading step may not be the total amount to be supplied, and may be appropriately changed depending on the state of the effect to be obtained and the state of the aggregate. The remaining blended water may be supplied in other steps, and is not limited to the above-described embodiment.

Here, the terms used in this specification will be described. The hydraulic substance powder refers to a powder that is cured by water and a hydration reaction and becomes a substance that is not soluble in water. Cement is a typical hydraulic material, but there are others that can be employed. That is, among hydraulic substance powders, there are cement having a fast hydraulic reaction, and blast furnace slag, fly ash, silica fume and the like having a relatively slow hydraulic reaction. Limestone fine powder and the like are those that do not have a hydraulic reaction. These are admixtures. An appropriate hydraulic substance other than the cement can be mixed with the cement and used as a hydraulic substance as a whole.
The hydraulic substance powder in this embodiment is made of cement alone, or in addition to cement, at least one or more kinds of blast furnace slag, fly ash, silica fume, and limestone fine powder are added and mixed. Any one of mixed powders is used. Therefore, a hydraulic substance powder made of a mixed material may be stored in the admixture powder silo instead of cement, and is referred to as a hydraulic substance powder in this specification including only cement.

Note that the capillary state means that the water between the paste particles with a small water-powder ratio of water and cement adhering to the aggregate surface is filled with water, the bond strength between the particles is the strongest, and the mixing energy is maximized. State. Therefore, the mixing torque by the mixer also increases.
In addition, the phenicular state refers to a state in which less moisture is contained between the powder particles than in the capillary state, bubbles and the like can remain, and the bonding force between the particles is smaller than in the capillary state.

Next, the kneading apparatus 1 and the kneading method according to the embodiment based on the principle of the present invention described above will be described with reference to the accompanying drawings.
FIG. 4 shows a kneading apparatus 1 according to an embodiment of the present invention.
The kneading apparatus 1 shown in FIG. 4 is a batcher plant for producing concrete or mortar by the kneading method according to the present invention. For example, cement for storing cement as hydraulic substance powder supplied from a tank truck. A silo 2 and an admixture powder silo 3 for storing admixture powder also included in the hydraulic substance powder are provided. The cement and the admixture powder supplied from the hopper of the cement silo 2 and the hopper of the admixture powder silo 3 are supplied to the hydraulic substance powder measuring hopper 5 through the screw feeder 4.

Further, sand, which is fine aggregate conveyed by the overhead crane 7 or the like, is stored in the fine aggregate storage hopper 8 and further supplied to the fine aggregate weighing hopper 9 via a belt conveyor. Furthermore, gravel, which is coarse aggregate transported by the overhead crane 7 or the like, is stored in the coarse aggregate storage hopper 10 and supplied to the coarse aggregate weighing hopper 11 via a belt conveyor. Further, the water stored in the water tank 13 is stored in the water measuring hopper 14 (water measuring means). The admixture stored in the admixture tank 16 is supplied to the water measurement hopper 14 via the measurement tank 17.
In these hydraulic substance powder measuring hopper 5, fine aggregate measuring hopper 9, coarse aggregate measuring hopper 11, and water measuring hopper 14, each measured material is selectively supplied to the mixer 20 by the control means 18 and mixed. Is supposed to do. The mixer 20 includes, for example, a biaxial forced kneading mixer.

  The water metering hopper 14 stores, for example, blended water (total water) W, which is the total amount for mixing mortar or concrete, and the blended water W is supplied hydraulic material such as aggregate and cement. In order to determine the amount W of the blended water corresponding to each amount and supply it to the mixer 20, the valve is controlled to open and close by measuring with a load cell (not shown).

  In FIG. 5, the control means 18 includes an aggregate supply means 22, a hydraulic substance powder supply means 23, and a water supply means 24. The aggregate supply means 22 measures the predetermined amount of sand in the fine aggregate measuring hopper 9 and measures the predetermined amount of gravel in the fine aggregate measuring hopper 9 for adjustment mixing. Coarse aggregate supply means 27 to be supplied to the mixer 20 is provided. Also, the hydraulic substance powder supply means 23 measures the cement and admixture powder with the hydraulic substance powder measuring hopper 5 and supplies them to the mixer 20 at the time of kneading.

In the water supply means 24, the water amount setting means 29 predetermines the total amount W of the blended water set according to the predetermined aggregate and the hydraulic substance powder containing cement. . An instruction signal for the blended water W set by the water amount setting means 29 is transmitted to the water metering hopper 14 by the blended water supply means 30 to measure the blended water W and supply it to the mixer 20.
Further, a mixer operating means 31 for first kneading the mixer 20 in a state where the aggregate and the mixed water W are supplied to the mixer 20 by the aggregate supply means 22 and the mixed water supply means 30 is provided. In the mixer operating means 31, mortar or concrete is produced by mixing the mixer 20 in the second state with the hydraulic substance powder C supplied from the hydraulic substance powder supply means 23 to the mixer 20. .

The kneading apparatus 1 according to the present embodiment has the above-described configuration, and the kneading method according to the present embodiment will be described along the flowchart shown in FIG.
When concrete is produced by the kneading apparatus 1 according to the present embodiment, for example, it takes time to supply the aggregate. Therefore, the supply amount of the required amount of sand and gravel is determined, and the fine aggregate supply means 26 and the coarse aggregate supply In accordance with the instruction signal from the means 27, a predetermined amount of sand and gravel are measured by the fine aggregate measuring hopper 9 and the coarse aggregate measuring hopper 11 and put into the mixer 20 (step 101).

Then, the water amount setting means 29 determines the amount W of the blended water corresponding to the amounts of the aggregate and the hydraulic substance powder C determined by the aggregate supply means 22 and the hydraulic substance powder supply means 23, respectively. The blended water W determined by the water amount setting means 29 is weighed by the water metering hopper 14 in accordance with an instruction signal from the blended water supply means 30 and supplied to the mixer 20 (step 102). In the mixer 20, these aggregates and the mixed water W are first kneaded (step 103).
By the first kneading, the blended water W can be uniformly attached to the entire surface of the fine aggregate and coarse aggregate before the hydraulic substance powder such as cement is charged.

Next, after the first kneading step is completed, the hydraulic substance powder containing the admixture or the like in the cement whose dosage is set by the hydraulic substance powder supply means 23 is added by the hydraulic substance powder measuring hopper 5. Weigh and supply to mixer 20 (step 104), and perform second mixing (step 105).
When water is added to the aggregate and kneaded and then the hydraulic substance powder is added, the water is evenly adhered to the aggregate surface, so that the kneaded portion in the capillary state can be increased.

  That is, when a hydraulic substance powder such as cement is put into the mixer 20, the water-cement ratio is smaller than the capillary state when the water uniformly adhering to the aggregate surface and the lump of cement powder are mixed. It is thought that this part occurs. These are agitated, the cement kneaded material comes into contact with the aggregate surface without cement, the cement powder spreads while increasing the water cement ratio W / C, and the water cement ratio W / C gradually becomes uniform. In this process, the portion where capillary kneading is performed increases, so that the bleeding rate of the mortar and concrete to be produced is improved.

Next, a test example of the kneading method according to the present embodiment will be described.
First, two types of water cement ratio W / C, which is the ratio of the amount C of the hydraulic substance powder containing cement and the blended water W, are 55% and 65%.
As a conventional example, the hydraulic substance powder C containing cement in the aggregate and the total blended water W were simultaneously added to the mixer 20 and kneaded together. In this case, as shown in FIG. 6, the bleeding rate of the concrete was 2.8% when the water cement ratio W / C was 55%, and 3.4% when the water cement ratio was 65%.

On the other hand, in this example (aggregate / water tip kneading method), the aggregate was first charged and all the mixed water W was charged into the mixer 20 and the first kneading was performed for a predetermined time. Next, the cement C was put into the mixer 20 and second mixing was performed for a predetermined time. The amount of each material is the same in the conventional example and the example. The bleeding rate of the obtained concrete was 1.3% when the water cement ratio W / C was 55%, and 1.8% when the water cement ratio W / C was 65%.
In addition, although the manufacturing method of concrete was demonstrated in the above-mentioned embodiment and an Example, even in the case of the mortar which does not contain a coarse aggregate, the mortar with a low bleeding rate can be manufactured similarly.

As described above, according to the kneading apparatus 1 and the kneading method according to the present embodiment, mixing the aggregate and water before adding the cement to the aggregate reduces not only the bleeding but also the cement. Dama can also be reduced, and cement can be effectively hydrated to improve the properties of mortar or concrete to produce high strength mortar or concrete.
In addition, the bleeding rate is kept to a minimum, the fluidity of the mortar or concrete is high when it vibrates and does not separate, and the cement lumps are reduced, so that a high-strength mortar or concrete can be obtained.

  The kneading method and the kneading apparatus 1 according to the present invention are not limited to the above-described embodiments, and can be appropriately changed or replaced without departing from the gist of the present invention. Both are included in the scope of the present invention.

For example, the water metering hopper 14 and the water amount setting unit 29 according to the above-described embodiment are provided with an integrated container and metering unit as the water metering hopper 14, and the mixed water W calculated by the water amount setting unit 29 is used as the load cell of the water metering hopper 14. The amount of water is measured and supplied to the mixer 20, but the present invention is not limited to such means.
For example, the blended water W weighed in advance may be put into the water tank 13, and the whole amount may be put into the mixer 20 by the blended water supply means 30.
In the kneading apparatus 1 according to the present invention, the first supply means includes aggregate supply means 22 and water supply means 24, and the second supply means includes hydraulic substance powder supply means 23.

In the kneading method according to the above-described embodiment, the aggregate is put into the mixer 20 and then the blended water is supplied. Instead, the aggregate and the blended water are put into the mixer 20 at the same time. Alternatively, the first kneading may be performed thereafter by supplying the aggregate after supplying the blended water to the mixer 20.
In the kneading method and apparatus 1 according to the present invention, the first kneading and the second kneading may be performed continuously, or the hydraulic substance powder may be supplied during the kneading process. Alternatively, the kneading process may be interrupted between the first kneading and the second kneading, and the hydraulic substance powder may be put into the mixer 20 during that time.

DESCRIPTION OF SYMBOLS 1 Kneading apparatus 2 Cement silo 3 Admixture powder silo 5 Hydraulic substance powder measurement hopper 9 Fine aggregate measurement hopper 11 Coarse aggregate measurement hopper 14 Water measurement hopper 18 Control means 20 Mixer 22 Aggregate supply means 23 Hydraulic substance Powder supply means 24 Water supply means 29 Water amount setting means 30 Compounded water supply means 31 Mixer operating means

The present invention relates to a batch kneading method and a batch kneading apparatus for supplying blended water necessary for producing concrete or mortar before charging hydraulic substance powder.

The present invention aims to In view of such a situation, to provide a collective kneading apparatus and batch kneading method and to improve the strength of the concrete or mortar by removing the lumps of cement as well as improving the bleeding rate And

Bulk Mixing method of the present invention is a batch kneading method for producing a mortar or concrete kneaded by adding and the required formula water hydraulic substance powders such aggregate and cement respectively, compounding water aggregate A first kneading step of adding and kneading, and then a second kneading step of adding and kneading the hydraulic substance powder, and uniform water on the surface of the aggregate by the second kneading and the above It is characterized in that the bleeding rate is reduced by gradually mixing the hydraulic substance powder and shifting the water-cement ratio from the phenicular state to the capillary state .
According to the lump kneading method according to the present invention, it is possible to wet the entire surface of the aggregate evenly and uniformly with water by adding the premixed water to the aggregate in advance and mixing it first. After that, when hydraulic material powder such as cement is supplied and second kneaded, the uniform water on the aggregate surface and the lump of cement powder are mixed, so that the water-cement ratio is smaller than the capillary state, and the phencular state It is surmised that a large amount of this part will occur, and by mixing these, the cement kneaded material will come into contact with the aggregate surface without cement and the water cement ratio will gradually increase, spreading the cement powder, and the water cement ratio Becomes uniform (see FIG. 1). In this process, the bleeding ratio can be improved by increasing the portion where the kneaded cement is mixed from the phenicular state to the capillary state.

Further, batch kneading apparatus according to the present invention is a batch kneading apparatus for producing a mortar or concrete kneaded by adding and the required formula water hydraulic substance powders such aggregate and cement mixers, respectively, bone After the first supply means for adding the material and the mixed water to the mixer and the second supply means for adding the hydraulic substance powder to the mixer, the aggregate and the mixed water are added to the mixer by the first supply means and kneaded. In the second supply means, uniform water on the aggregate surface and hydraulic substance powder are gradually mixed, and the water-cement ratio is shifted from the phenicular state to the capillary state to reduce the bleeding rate. Features.
According to the present invention, the first supply means adds the aggregate and blended water into the mixer and mixes it first, so that the water can be evenly distributed over the entire surface of the aggregate, and then the cement is added. By adding the hydraulic substance powder to the mixer by the second supply means and mixing the mixture with the second, the uniform water on the aggregate surface and the lump of cement powder are mixed, and the water cement ratio is smaller than the capillary state. Many parts of the curled state occur, and the cement kneaded material comes into contact with the water-free aggregate surface without cement, and the cement powder spreads while gradually increasing the water-cement ratio, making the water-cement ratio uniform. To improve the bleeding rate.

According to the lump kneading method and lump kneading apparatus according to the present invention, the aggregate and the mixed water are first kneaded first, and the water is evenly distributed over the entire surface of the aggregate, and then the hydraulic properties such as cement High strength concrete or mortar with reduced bleeding rate can be produced by adding the material and further kneading the mixture.

In the batch kneading method according to the present invention, since the aggregate and water are well kneaded before the hydraulic substance powder such as cement is added to the aggregate, the water uniformly adheres to the entire aggregate surface. Mix well with hydraulic material powder to improve bleeding rate and reduce cement lumps, effectively hydrate the cement and improve the properties of mortar or concrete it can.

The batch kneading method according to the present invention adds aggregate (excluding wood chips) , hydraulic powder such as cement (excluding quick-setting cement), and necessary blended water, and kneads to fix mortar or concrete. In the batch mixing method manufactured using the mixer of the formula, the first mixing step of adding the mixing water to the aggregate and mixing, and then the second mixing step of adding the hydraulic substance powder and mixing And the second kneading mixes the uniform water on the surface of the aggregate and the hydraulic substance powder gradually, and the water-cement ratio increases from the phenicular state so that the bleeding rate is minimized. It is characterized in that the bleeding rate is reduced by shifting to a state and then further increasing the water cement ratio .
According to the lump kneading method according to the present invention, it is possible to wet the entire surface of the aggregate evenly and uniformly with water by adding the premixed water to the aggregate in advance and mixing it first. After that, when hydraulic material powder such as cement is supplied and second kneaded, the uniform water on the aggregate surface and the lump of cement powder are mixed, so that the water-cement ratio is smaller than the capillary state, and the phencular state parts can often occur, further Yuki spreads out gradually increased while the cement powder to be cement kneaded product is in contact with the free surface of the aggregate cement water-cement ratio by kneading them, uniform water-cement ratio (See FIG. 1). In this process, the bleeding ratio can be improved by increasing the portion where the kneaded cement is mixed from the phenicular state to the capillary state.

Also, the batch kneading apparatus according to the present invention is a mortar in which aggregates (excluding wood chips) , hydraulic powders such as cement (excluding rapid cement ) and necessary blended water are added to a mixer and mixed. Or, in a batch kneading apparatus for producing concrete using a fixed mixer, the first supply means for adding aggregate and mixed water to the mixer, and the second supply means for adding hydraulic substance powder to the mixer, Aggregate and blended water are added to the mixer by the first supply means and kneaded, and then the uniform water on the surface of the aggregate and the hydraulic substance powder are gradually kneaded by the second supply means. moves the capillary state where the bleeding rate is the minimum value increases from the state, then, it is characterized in that so as to further reduce the bleeding rate by increasing the water-cement ratio .
According to the present invention, the first supply means adds the aggregate and blended water into the mixer and mixes it first, so that the water can be evenly distributed over the entire surface of the aggregate, and then the cement is added. By adding the hydraulic substance powder to the mixer by the second supply means and mixing the mixture with the second, the uniform water on the aggregate surface and the lump of cement powder are mixed, and the water cement ratio is smaller than the capillary state. Many parts of the curled state occur, and the cement kneaded material comes into contact with the water-free aggregate surface without cement, and the cement powder spreads while gradually increasing the water-cement ratio, making the water-cement ratio uniform. To improve the bleeding rate.

Claims (2)

In the kneading method for producing mortar or concrete by adding and mixing hydraulic substance powder such as aggregate and cement, respectively, and mixing water,
A first mixing step of adding water to the aggregate and mixing,
Then, a kneading method comprising the second kneading step of adding and kneading the hydraulic substance powder. In a kneading device for producing mortar or concrete by adding aggregate material powder such as aggregate and cement and mixed water to a mixer and kneading each,
First supply means for adding the aggregate and blended water to the mixer;
A kneading apparatus comprising a second supply means for adding the hydraulic substance powder to a mixer.

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