JP5181196B2 - Cleaning method for uncured cement composition handling equipment - Google Patents

Description

The present invention relates to a method of cleaning the uncured cementitious composition handling equipment.

  Uncured cement composition handling equipment, for example, fixed plant mixers used for kneading production of ready-mixed concrete (hereinafter abbreviated as ready-mixed concrete), mixers after unloading such as mobile agitator vehicles used for transporting ready-mixed concrete, agitators, etc. The uncured cement composition, for example, ready-mixed mortar or mortar that remains adhered to the inside of the inside, is usually washed away with a large amount of water.

  For example, raw concrete is kneaded by a raw concrete mixer, then loaded into an agitator car, which is a raw concrete transporter, and transported to a construction site.

  After unloading raw concrete at the construction site, raw concrete remains attached to the hopper, drum interior, discharge outer blades, scoop, flow guide and chute. Currently, for example, in the case of a large agitator car (10 ton load), approximately 70-80 About a liter of ready-mixed concrete remains on the drum inner wall and blades, and the concrete must be removed by blowing on-vehicle water as soon as possible before drying and hardening.

  Recently, vehicles equipped with automatic cleaning devices can be seen in agitator vehicles, but cleaning is not always sufficient, and hoppers, scoops, flow guides, chutes, etc. are cleaned by human hands as usual. There must be.

  As the adhering concrete hardens, unwashed areas such as the back of the blades are more likely to be washed away, and raw concrete adheres and accumulates one after another, and solidifies inside the drum. Solidified concrete may peel off during transportation and cause a serious accident such as a pipe clogging rupture of a concrete pump truck during unloading. Thus, the hardness may increase, the stirring ability may decrease, and the quality characteristic value may decrease.

For this reason, a person enters the drum of an agitator car several times a year and is performing a chiseling work using an air pick, etc., but this work performed in a narrow space is extremely dangerous and noise and dust are also notably lost. One of the work. For this reason, workers tend to wash the deposits with a large amount of water after unloading even if there are some problems in environmental conservation.
There is no facility that can wash and discharge the residual raw concrete in the construction site, and many cleaning operations are carried out on public roads, which can be misunderstood as fraudulent misconduct by third parties. .

  In addition to problems in the Road Traffic Law, in sewage splashes, waste water spills and soils on the road, the waste water receiving bucket attached to the tip of the chute is returned to the drum, and the outer blade is washed It is very dangerous to work at an altitude of 3m or more in an unstable posture. In addition, the washing method, the amount of washing water, the washing time, etc. vary greatly among individuals, the return time varies, and the efficiency of dispatching is very poor.

  There is also a strong demand for the development of a technology that recycles raw and mortar, residual and return capacitors that remain attached to the inside of the agitator car.

  Currently, as a method for reusing the adhesion mortar, a method of adding and using a stabilizer as described in JIS A 5308 Annex D (Non-patent Document 2), or Japanese Patent Application Laid-Open No. 2008-188999 (Patent Document) 3) The methods described in 3) are known. In any case, when cleaning the inside of the drum, it is necessary to prepare 50 liters of stabilizer diluent (in the case of large vehicles). If there is no on-board tank, it cannot be cleaned immediately after unloading.

  Further, in this method, only the inside of the drum can be cleaned, and the discharge outer blade and the like must be hand-washed as usual. Furthermore, the work is complicated, and environmental problems such as noise and dust are generated, and there are many problems to execute due to high reuse costs.

That is, according to the method described in the above JIS, installation of a dilution tank, a measuring device, a charging device, etc. is newly required, and the equipment cost is increased. Further, the amount of raw material loaded next time is 3 m ³ or more (in the case of large vehicles) There are restrictions, and the amount of stabilizer diluent added must be subtracted evenly from each batch of the next loaded raw control unit, making the handling of slump management, compounding correction, etc. complicated, extremely difficult and economical technical There are few factories that can cope with this, and even if it is established by JIS, it is not widely used.

A large amount of sludge water and washing waste (about 100 liters) in the drum that is generated by washing on the way back to the factory is taken back to the factory, discharged entirely to the car wash wastewater treatment facility in the factory, and then washed and transported next time. Wait for loading. In general, the car wash processing capacity in the factory is limited, it takes time until the car is discharged, and when waiting in the field for a long time, it is necessary to keep the engine running and rotate the drum to prevent consolidation. Therefore, wasteful use of energy and scattered CO ₂ are inevitable.

  Aggregates (coarse aggregates, fine aggregates) in the cleaning waste discharged from agitator cars, etc. are separated and collected by the classifier, but they are not adequately washed, the particle size and type are not constant, and are not standard In many cases, it is rarely reused due to management problems and is disposed of as industrial waste. The sludge water after the aggregate is removed is dehydrated with a filter press, the supernatant water is reused, and the dewatered cake is treated as industrial waste. Volumes and processing costs are increasing year by year, and the burden on each office is considerable.

  Even in the case of stationary mixers, if there is a lunch break during continuous use and other times are available, a large amount of water (500-1500 liters) is used to prevent the raw concrete from adhering and consolidating, as in the case of washing mobile agitators. Since cleaning is performed, a large amount of sludge water is generated, wastewater spills and the inside of the field becomes dirty, and the cleaning operator shortens the lunch break to perform work.

  Although the supernatant water is often reused, it depends on the shipping situation depending on the weather and the situation at the site, and it is difficult to use it stably every day. The excess supernatant water is caused by sulfuric acid or carbon dioxide. Although it is discharged into sewage after neutralization, it has major environmental problems.

  The raw concrete industry is also promoting the reuse of sludge water, but it is not popular because it cannot be understood by the purchaser, and the management and equipment are very expensive and labor intensive. It is in a situation to take measures to reduce the amount.

Japanese Patent Laid-Open No. 06-210621 JP 2005-111454 A JP 2008-188999 A JP 2010-125718 A

Symposium on “Suppression and Effective Utilization of Remaining / Returned Comers” Proceedings Report Interim Committee Report Japan Concrete Institute JIS A5308 Ready-mixed concrete Annex D “How to use mortar adhered to the drum of a track agitator” Japanese Standards Association

The present invention has been made in view of the above-mentioned problems, and the problem to be solved by the present invention is that it eliminates the conventional washing with a large amount of water, greatly reduces environmental pollution, and reduces industrial waste. Cleaning method for uncured cement composition handling equipment that can reduce environmental impact, improve work safety, improve and improve the quality of concrete, and promote reuse and conversion of recovered materials Is to provide.

In order to solve the above problem, in the present invention, as described in claim 1,
In the method for cleaning an agitator vehicle which is an uncured cement composition transport vehicle, an aqueous solution containing a surface active material is sprayed into the agitator drum of the agitator vehicle by using a sprayer to form fine particles having an average particle size of 1 μm to 50 μm. The fine particle mist is filled inside the agitator drum, and the fine particle is infiltrated into the uncured cement composition remaining on the inner wall and blade surface of the agitator drum, and the uncured An uncured cement composition handling device characterized in that the cement composition is easily peeled off from the adhesion surface and fluidized, and the uncured cement composition is moved downward by its own weight to perform fluidization washing . Configure the cleaning method.

In the present invention, as described in claim 2,
In the method for washing a fixed mixer used for kneading manufacture of an uncured cement composition, an average particle size of 1 μm or more is applied to an aqueous solution containing a surfactant by a sprayer toward the inside of the kneading mixer of the fixed mixer. Spray as fine particles of 50 μm or less, fill the mist of the fine particles inside the kneading mixer, and apply the fine particles to the uncured cement composition that remains adhering to the inner wall and blade surfaces of the kneading mixer. The uncured cement composition is made to permeate to make it easy to peel off from the adhesion surface and fluidize, and the uncured cement composition is moved downward by its own weight to perform fluidization washing. It constitutes a method for cleaning hardened cement composition handling equipment.

In the present invention, as described in claim 3,
The average particle size of the fine particles is 1 μm or more and 10 μm or less, and constitutes a method for cleaning an uncured cement composition handling device according to claim 1 .

In the present invention, as described in claim 4,
The method for cleaning an uncured cement composition handling device according to claim 1 or 2, wherein the spray amount of the fine particles is 60 to 150 ml / m ³ .

By applying an aqueous solution containing a surfactant to the uncured cement composition adhering to the inside of the agitator drum of the agitator car and the kneading mixer of the fixed mixer , the uncured cement composition is By using the method of moving downward by its own weight, the environmental pollution is greatly reduced, the environmental load is reduced by reducing industrial waste, the safety of work is improved, the quality of concrete is improved and improved, and the collected material is recycled. It is possible to provide a method for cleaning an uncured cement composition handling device, which can promote utilization and conversion.

It is the figure which showed typically the name of each part of a fixed mixer (raw concrete mixer) based on this invention, the attachment position of a sprayer, and the spray condition. It is the figure which showed typically the name of each part of a mobile mixer (agitator vehicle), the attachment position of a sprayer, and the spray condition which concern on this invention.

  Hereinafter, embodiments of the present invention will be described.

  In the case of a mobile mixer (agitator car), after transporting and unloading uncured cement composition (green concrete or fresh mortar), it contains a surface active substance from the sprayer installed in the hopper cover part toward the inside of the agitator drum. An aqueous solution (hereinafter referred to as a spraying liquid) is sprayed as fine particles, filled with mist of the fine particles, and permeated into the uncured cement composition adhering and remaining on the inner wall of the agitator drum and the surface of the blades. The composition is made to be easily peeled off from the adhering surface and fluidized and washed by moving it downward under its own weight.

  The above work can be performed immediately after unloading and can be performed by a simple operation on the driver's seat.

For stationary mixer (mixed concrete plant mixer), after completion of kneading, from sprayer installed in the mixer cover portion of the kneading mixer top, toward the kneading mixer and sprayed with a mist of fine particles of the spray liquid , is filled in the kneading mixer, mixed concrete (or fresh mortar, such as a composition comprising a cement) and to penetrate the residue, performs fluidization washed by superplasticizer together to easily peeled off from the attachment surface.

  The above operations can be performed by a simple operation on the operation panel by the operator. Moreover, since it can be performed in a short time, it can respond as many times as necessary.

  For cleaning raw parts that are outside a mobile or fixed mixer and are difficult to fill with fine mist, i.e. scoops, flow guides, chutes and concrete hoppers of raw concrete plants. It is also effective to make the liquid for spraying into a foam form with a foam generator and apply it to the adhered residual raw concrete to be washed. In addition, since the said spraying liquid contains surfactant, it becomes foamy easily.

In this way, the fine particles of the above-mentioned liquid for spraying are sprayed inside a kneading mixer or the like where raw concrete (or a composition containing fresh mortar, cement, etc.) remains adhered, and the mist is filled and adhered. By making the residue highly fluidized, the deposits can be easily removed without using a large amount of water.

  In the case of a mobile mixer (agitator car), after washing, transporting and unloading raw concrete (or fresh mortar, cement-containing composition, etc.), it is no longer necessary to perform a large amount of water washing to prevent adhesion. The generation of sludge water and the disposal of residual waste during work can be almost eliminated.

  Immediately after unloading, high fluidization cleaning can be performed in a short time by a simple operation on the driver's seat. In addition, noise, exhaust gas, and wasteful fuel use costs during street car washing can be reduced. Furthermore, the return time from the site is greatly shortened, enabling efficient dispatch, and reducing transportation costs.

  Furthermore, dangerous high-altitude work on public roads can be eliminated, and washing wastewater can be scattered, spilled and soiled on the road, or accidents where strong alkaline wastewater flows into sewage can be eliminated. Since sludge water is not generated in the agitator drum, there is no discharge of residual water after return and car washing work, and the working time can be greatly shortened.

For stationary mixer (mixed concrete plant mixer), and long idle time after kneading kneading mixer interior dry, adhere raw Con (or, fresh mortar, such as a composition comprising a cement) of but caking occurs, the By carrying out the invention, this can be prevented and washing waste water can be greatly reduced, and the working efficiency can be dramatically improved.

  The final cleaning after the shipment is completed with a small amount of water, and it is possible to significantly reduce the generated sludge water and reduce dehydrated cake, thereby suppressing the discharge of excess supernatant water outside the factory and the generation of industrial waste. be able to.

High fluidized deposited raw con (or fresh mortar composition comprising cement, etc.), it runs off kneaded mixer inner wall and blade, since no simplicity, like chipping operation of adhering consolidation of internal kneading mixer Freed from dangerous heavy labor.

High fluidized deposited raw con (or fresh mortar composition comprising cement, etc.), gather the kneading mixer bottom a liquid viscous. The amount of the liquid composition resulting by applying the present invention, with respect to the loading volume of the kneading capacity and agitator vehicles kneading mixers, usually 2% or less, relative to the ready-mixed concrete to be loaded on the new Because this composition does not adversely affect the workability (for example, condensation abnormalities) and the quality characteristics such as the compression strength of the resulting product, it can be reused and the amount of industrial waste Can be greatly reduced. At this time, there is no need to adjust the composition of the freshly loaded raw food according to the amount of the liquid composition.

  Highly fluidized adherent kon (or a composition containing fresh mortar, cement, etc.) retains the properties and quality for a predetermined period of time. Industrial waste can be reduced to almost zero by diverting, recycling, and making secondary products as raw materials.

  The spraying liquid used in the present invention is an aqueous solution containing a surface active substance having a setting delay effect and a fluidity increasing effect on the uncured cement composition.

  Examples of the surfactant include chemical admixtures for concrete (eg, resinate compounds, alkylbenzenesulfonate compounds, higher alcohol ester compounds, polyol complexes, lignin sulfonates and their derivatives, oxycarboxylates. -Based compounds, alkylallyl sulfonate-based compounds, melamine sulfonate-based compounds, surfactants based on polycarboxylate-based compounds), adhesion mortar stabilizers (for example, oxycarboxylate and alkylaminophosphate complex) Body), biocon recovery modifier (recover): (for example, oxycarboxylate-based compounds, aminosulfonate-based compounds) and the like.

  All of these surface-active substances have both a fluidity increasing effect and a setting delay effect with respect to the uncured cement composition. However, the chemical admixture for concrete is excellent in the fluidity increasing effect. Since the surface-active substance is excellent in the effect of delaying the curing, in practical use, it is preferable to mix a chemical admixture for concrete with other surface-active substances as in the following examples.

  Further, a shrinkage reducing agent (polypropylene glycol, ethylene oxide methanol, etc.) may be mixed and used in the spray liquid.

  More specifically, examples of the polycarboxylic acid salt composition as the surfactant include (meth) acrylic acid-based copolymers and maleic acid-based copolymers, and specific examples include methacrylic acid-methoxy. Polyethylene glycol methacrylate copolymer, methacrylic acid-methoxypolyethylene glycol methacrylate-sodium methallyl sulfonate copolymer, methacrylic acid-methoxypolyethylene glycol methacrylate-sodium methallyl sulfonate-acrylic acid ester copolymer, maleic acid-methoxypolyethylene Glycol allyl ether copolymer, methoxypolyethylene glycol maleate-styrene copolymer, methacrylic acid-hydroxypropyl methacrylate copolymer, acrylic acid-hydroxyethyl acrylate copolymer And the like.

  Further, examples of the oxycarboxylic acid composition include hydroxycarboxylic acid and salts thereof including citric acid, gluconic acid, tartaric acid, fumaric acid, itaconic acid, malonic acid and glucoheptanoic acid; polycarboxylic acid and salts thereof, preferably low Molecular weight polymaleic acid, polyfumaric acid, polyacrylic acid and polymethacrylic acid; antioxidants such as ascorbic acid, isoascorbic acid; polymers such as preferably low molecular weight sulfonic acid-acrylic acid copolymers, polyhydroxysilanes and polyacrylamides Carbohydrates such as sucrose and corn syrup; and lignosulfonates such as calcium lignosulfonate. Of these, hydroxycarboxylic acids, polycarboxylic acids, ascorbic acid, isoascorbic acid, carbohydrates and polyhydroxysilanes are preferred. Suitable hydroxycarboxylic acids are gluconic acid and glucoheptanoic acid. Further preferred are at least one phosphonic acid type retarder and at least one different kind of mixture.

  Furthermore, the above spraying liquid is a chemical admixture for concrete, an adhering mortar stabilizer, an air entraining agent, an antifoaming agent, a curing agent, a protective agent, a release agent, a modifier, which does not adversely affect concrete and steel. A fluidizing agent, a coloring agent, a fragrance, a light agent, other surface active substances, a microbial substance, and the like may be included, and the quality of the composition including cement may be maintained and improved by the application thereof.

The fine particles of the spraying liquid are prepared by ejecting the liquid from the fine holes using high-compressed air. The obtained fine particles are stably suspended inside the kneading mixer and the wall surface thereof. As shown in Table 1 of Example 1 below, the average particle diameter is preferably 50 μm or less, preferably 10 μm or less. .

As shown in FIG. 1, in the case of a fixed mixer (raw concrete mixer), the sprayer 1 is placed on the mixer cover 5 on the top of the mixer (kneading mixer) 4 so as to spray the above-mentioned spraying liquid toward the inside of the mixer 4. Install. A storage tank 2 placed in the vicinity of the sprayer 1 is filled with a spraying liquid. After confirming that the dust collector has stopped, close the opening and closing parts such as the inspection window, and make the inside of the mixer 4 including the mixer cover 5 sealed. The mixer 4 is started, the kneading blade 7 is rotated, and the spray switch is turned on. The liquid for spraying in the storage tank 2 is sprayed in the form of a mist from the sprayer 1 by the compressed air from the compressor 3, and a predetermined amount of the mist is filled in about 5 minutes. After spraying is finished, the rotation of the blades 7 is stopped and left until the next mixing starts. The raw kon or fresh mortar adhering to the inside of the mixer 4 is made into a high fluidity, moves downward by its own weight, and gathers at the bottom of the mixer 4 respectively, and maintains the fluidity for the next kneaded green kon or fresh mortar. And reused. At this time, since the amount of the liquid used for spraying is very small compared to the amount of freshly prepared raw kon or fresh mortar, the composition of the freshly prepared raw kon or fresh mortar is changed to the raw kon or fresh mortar to be reused. It is not necessary to change according to the amount.

As shown in FIG. 2, in the case of a mobile mixer (agitator wheel 8), the sprayer 1 is installed on the openable hopper cover 6 so as to spray a mist of the spray liquid toward the inside of the agitator drum. First, the storage tank 2 is filled with a predetermined amount of the spraying liquid before loading the raw concrete. Within 5 minutes after completion of unloading, it is confirmed that the hopper cover 6 is closed, and mist is sprayed from the sprayer 1 into the agitator drum. The agitator wheel 8 is in a low-speed forward rotation (kneading direction) state as in the case of transportation. In about 5 minutes, a predetermined amount of mist fills and adheres to the inside of the agitator drum, and the fresh mortar and fresh mortar are fluidized and collected at the front bottom of the agitator drum. The freshly mixed mortar and fresh mortar collected at the front bottom of the agitator drum maintain fluidity and are reused as a unit with the next loaded raw kon. In this case as well, it is not necessary to change the composition of the ready-mixed kon which will be loaded next time according to the amount of the ready-mixed kon.

  Air atomized to about 0.25 to 0.4 MPa is used for atomization and atomization of the liquid for spraying, and the spraying capacity is about 0.01 to 0.1 liter / minute per sprayer. . In the case of a mobile mixer (agitator wheel 8), it is convenient to use a small air tank 9 of about 10 to 30 liters.

  The storage tank volume of the atomizing liquid to be sprayed is preferably about 2 to 20 liters in the case of a fixed mixer, and 0.5 to 2 liters in the case of a mobile mixer.

The amount of fine particle mist to be filled in the kneading mixer is 0.1 to 0.2 liter / m ^{3 in} terms of spraying liquid.

  The spraying time is preferably within 15 minutes after completion of mixing and discharging in the case of a fixed mixer, and within 5 minutes after completion of unloading in the case of a mobile mixer.

  In consideration of reusing the recovered highly fluidized ready-mixed concrete and fresh mortar, it is desirable that the next ready-made ready-made concrete be loaded and loaded within 90 minutes after spraying the mist.

  Hereinafter, the items whose effects were confirmed by the implementation of the present invention will be shown as examples including comparative examples.

To confirm the optimum particle size, install a sprayer on the open / close hopper of an 8-ton medium-sized agitator vehicle ( agitator drum volume 5 m ³ ), and adjust the amount of mixed air and the length of the siphon tube. The average fine particle diameter was changed to 10 to 50 μm, and 0.5 liter of the spray liquid was sprayed into the agitator drum for 5 minutes. The spraying liquid is the same as in Example 2 below.

  The mist having an average fine particle diameter of 10 to 50 μm was generated using a quick fogger manufactured by Spraying System Japan Co., Ltd. as a sprayer.

  In addition, the fog with an average particle diameter of 300 micrometers or more shown as a comparative example was generated using the Panasonic Corporation electric sprayer: BH-594P.

  The obtained results are shown in Table 1.

表中、「浮遊程度」と「充満程度」とは、それぞれ、アジテータドラム空間内における微小粒子の浮遊程度と充満程度とを示し、「有効性」は、付着セメント組成物を流動化し、下方向に移動させる能力の大きさを表している。

In the table, “floating degree” and “filling degree” indicate the floating degree and filling degree of fine particles in the agitator drum space, respectively. “Effectiveness” indicates the downward direction by fluidizing the cement composition It represents the size of the ability to move to.

As can be seen from Table 1, if the average particle size is 50 μm, the effect of the present invention appears, and if the average particle size is smaller than 50 μm, the fine particles stay longer and more widely in the agitator drum space. Finally, the amount absorbed by the adhering cement composition increases and the effect of the present invention becomes remarkable.

  In addition, 1 micrometer is confirmed as a small microparticle diameter. Therefore, when the average particle diameter is 1 μm or more and 50 μm or less, the effect of the present invention appears.

  As described above, the method for cleaning an uncured cement composition handling device according to claim 1, wherein the surface-active substance is introduced into the uncured cement composition handling device to which the uncured cement composition is attached. The method for cleaning an uncured cement composition handling device according to the present invention is also a method for cleaning an uncured cement composition handling device according to the present invention.

  When spraying a mist having an average particle diameter of 300 μm or more shown as a comparative example using the sprayer BH-594P, most of the droplets fall in the space without touching the cement composition, Since the adhering cement composition was not fluidized, effectiveness (effect of the present invention) was not recognized.

In order to confirm the cleaning effect due to the difference in the amount of liquid added for spraying, we confirmed the amount of recovered raw kon collected after fluidization cleaning and its properties. The conditions at that time are as follows.
(1) Vehicle used: Medium-sized agitator vehicle ( agitator drum volume 6.3 m ³ ), average load capacity: 3.5 m ³ .
(2) Spraying time: Spraying was carried out within 5 minutes after unloading raw concrete.
(3) Particle size: Fine particles having an average particle size of 15 μm or less were used.
(4) Spraying device:
(I) Nebulizer: Quick Fogger manufactured by Spraying System Japan Co., Ltd. used in Example 1.
(Ii) Attachment position: A stay was attached in the vertical direction from the center part on the inner surface side of the openable hopper cover, and a sprayer was fixed to the lower end of the stay so that mist was generated toward the inside of the agitator drum.
(Iii) Storage tank: 0.5 liter cycle bottle, fixed to the step handrail with a bottle holder.
(Iv) Compressor: IS-925HT 220W, manufactured by Anest Iwata 100V, DC24V-AC100V Inverter was used after converting direct current to alternating current.
(5) Spraying liquid: 0.5 liter mixed liquid, which is prepared by mixing the following high-performance AE water reducing agent and recovered water modifying agent 4 to 1.
(I) High performance AE water reducing agent (polycarboxylic acid type) which is one of chemical admixtures for concrete: Darex Super 100PHX manufactured by Grace Chemicals.
(Ii) Biocon recovery modifier (oxycarboxylic acid type): Recover manufactured by Grace Chemicals.

  The obtained results are shown in Table 2.

表中、「有効性」は表１の有効性と同じである。

In the table, “Effectiveness” is the same as the effectiveness in Table 1.

From Table 2, good fluidization and high recovery rate are obtained when the spray amount (amount of spray liquid per unit volume of the agitator drum) is 20 or more, preferably 60 to 150 ml / m ³ (milliliter / cubic meter). You can see that If the spray amount exceeds 500 ml / m ³ , it is necessary to change the composition of the freshly loaded raw kon, so the spray amount is desirably 500 ml / m ³ or less.

  A spray amount of 0 corresponds to a comparative example.

Incidentally, using Spraying Systems Japan Ltd. Quick fogging gar a sprayer used herein, an aqueous solution containing a surfactant was sprayed into the agitator drum, the uncured cement mounted on the agitator within the drum It can be applied to the composition to change the quality characteristics (eg, slump, air content, strength, viscosity, solidification characteristics) of the uncured cement composition.

  Widely used as a safe, low-cost, pollution-free cleaning method that completely eliminates washing with a large amount of water after unloading of mobile mixers (agitator vehicles) and stationary mixers (raw concrete mixers) that are currently being carried out there is a possibility.

Moreover, since raw concrete and fresh mortar adhered and remaining on the inner wall of the kneading mixer and the like can be reused without being discarded, there is a high possibility that it will be adopted as an effective resource utilization method.

1: sprayer, 2: storage tank, 3: compressor, 4: mixer, 5: mixer cover, 6: openable hopper cover, 7: vane, 8: agitator wheel, 9: air tank.

Claims (4)

In the method of cleaning an agitator car that is an uncured cement composition carrier car ,
An aqueous solution containing a surfactant is sprayed into the agitator drum of the agitator wheel as fine particles having an average particle size of 1 μm or more and 50 μm or less by a sprayer, and the fine particle mist is filled inside the agitator drum. Letting the fine particles permeate the uncured cement composition adhering and remaining on the inner wall and blade surface of the agitator drum, making the uncured cement composition easy to peel off from the adhering surface and fluidizing, A cleaning method for uncured cement composition handling equipment, wherein the uncured cement composition is moved downward by its own weight and fluidized cleaning is performed . In the washing method of the fixed mixer used for kneading production of the uncured cement composition,
An aqueous solution containing a surfactant is sprayed as fine particles having an average particle diameter of 1 μm to 50 μm with a sprayer toward the inside of the kneading mixer of the fixed mixer, and the fine particle mist is sprayed into the kneading mixer. Fill the inside and allow the fine particles to penetrate into the uncured cement composition remaining on the inner wall and blade surface of the kneading mixer, making the uncured cement composition easy to peel off from the adhesion surface and flowing. A method for cleaning an uncured cement composition handling device, characterized in that the uncured cement composition is moved downward by its own weight and fluidized cleaning is performed . The method for cleaning an uncured cement composition handling device according to claim 1 or 2, wherein an average particle size of the fine particles is 1 µm or more and 10 µm or less . The method for cleaning an uncured cement composition handling device according to claim 1, 2, or 3, wherein the spray amount of the fine particles is 60 to 150 ml / m ³ .

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