JP5010267B2 - Manufacturing method of concrete products - Google Patents

Description

  The present invention relates to a method for producing a concrete product that effectively uses, for example, the noro generated during centrifugal molding of concrete.

  Many of pipe-shaped concrete products such as concrete pipes and concrete poles are manufactured by so-called centrifugal molding in which a concrete mold is molded while rotating.

  This centrifugal molding has the disadvantage that a concrete product with high strength can be obtained by compacting the concrete by centrifugal force, but excessive water and residue are pushed out to the center of rotation, resulting in slurry-like paste. is there.

  Since the concrete noro has calcium oxide (CaO) as a main component and has a very strong alkalinity, it is difficult to reuse it as a concrete product. In addition, it has a large impact (harm) on the human body and the environment. For example, there is a concern of environmental destruction (alkali contamination) due to elution of strong alkali into the soil. This is very troublesome and requires a lot of labor and cost.

  The slurry-like paste actually generated at the time of centrifugal molding is stored, for example, in a separation tank, where the solid components of the paste are deposited on the bottom, collected by scooping by a back-for or pumping, and dried in the sun. The dehydrated state was transferred to a waste disposal contractor for disposal. In addition, for example, the slurry-like slurry is separated into solid components and moisture using a centrifugal separator to obtain a dehydrated cake (dehydrated cake) from which excess moisture has been drained, which is then transported to a disposal processor for disposal. It was.

  As described above, the slurry-like paste generated during centrifugal molding is generally disposed of after reducing the volume as much as possible so as to reduce the transportation cost and ensure a good disposal place. However, a great deal of labor and cost for disposal of Noro is extremely unnecessarily causing a loss of centrifugal molding efficiency.

  In view of this, various methods and proposals have been made in the past in order to suppress the occurrence of cracks during concrete centrifugal molding (for example, Patent Documents 1 and 2).

  However, none of them can achieve a sufficient effect, and it is impossible to completely prevent the occurrence of noro. Therefore, this noro problem is a major issue in the concrete centrifugal molding industry. is there.

Japanese Patent Publication No. 5-59801 JP-A-6-183799

  The present invention is an epoch-making technique invented in view of how to effectively recycle this noro, not how to prevent the occurrence of the above-mentioned noro. Or by adding this solidifying agent and water and kneading and solidifying it into a concrete product, for example, in the same way as ordinary cement concrete without fear of alkaline soil contamination by strong alkali of Noro. Concrete products that can be used for various purposes such as flooring can be manufactured and realized, and even if you want to discard them, you can safely and easily dispose of them because there is no concern about alkali contamination as described above. An object of the present invention is to provide a method for producing a groundbreaking concrete product that is extremely practical.

  The gist of the present invention will be described with reference to the accompanying drawings.

The slurry-like slurry generated during the molding process of the concrete is dehydrated, and the dehydrated slurry is mixed with a solidifying agent having latent hydraulic properties and water and kneaded. Based on the specific gravity of the solid component, the content of the noro solid component and the content of the moisture of the noro are obtained from the volume and weight of the noro, respectively, and the amount of the moisture content relative to the content of the solid component of the noro is calculated. According to the method for producing a concrete product, the solidifying agent is hydrated and solidified by the stimulating action of the alkali component of the Noro to be solidified into a concrete product. .

Also, as the solidifying agent, it is those according to the method of manufacturing a concrete product according to claim 1, characterized by using a blast furnace slag.

Also, in the slag, before Symbol solidifying agent, water, and added to the cement kneaded claim 1, 2 of any one, characterized in that adjusting sets the intensity by setting the amount of the cement It concerns on the manufacturing method of the concrete product as described in.

The method according to any one of claims 1 to 3 , wherein an aggregate or coarse aggregate is added and kneaded to the slot.

  Since the present invention is as described above, the alkali component of the concrete noro is used as a stimulant for the latent hydraulic property of the solidifying agent, and the solidifying agent can be satisfactorily hydrated by the stimulating action of the alkali component of the noro. It is possible to solidify well by the formation of a hydrate accompanying this hydration reaction.

  In addition, since the alkali component of Noro is consumed as a stimulating agent during the hydration reaction of the solidifying agent, the strong alkalinity of Noro is neutralized with the solidification by the hydration reaction, thereby the same as ordinary cement concrete As a result, it is possible to manufacture and realize a concrete product that can be used for various purposes such as a roadbed material in the same manner as ordinary cement concrete.

  Therefore, the present invention is a concrete that can be used for various purposes in the same way as ordinary cement concrete by utilizing troublesome cocrete noro that is difficult to use due to its strong alkalinity and requires great labor and cost to dispose of. The product can be manufactured and realized, and it is possible to effectively use this troublesome waste without discarding it. Also, if you want to dispose of the present invention using this waste, the strong alkalinity of Noro is moderate. Because it is harmonized, it can be safely and easily disposed of without worrying about alkaline contamination of the soil environment, and it is extremely innovative that can reliably solve the problems of Noro in this kind of concrete centrifugal molding industry. It becomes a method for producing concrete products with excellent practicality.

Further , in the present invention , for example, by dehydrating a slurry-like paste produced during a molding process such as a centrifugal molding process, the volume can be reduced by that much, and a highly fluid retaining slurry or the like has high shape retention. because it can to a solid state, simply obtained even achieving such handling easy also reduce the transport costs as compared with the case of directly using a slurry Noro, the onset bright becomes feasible to easy easy.

  Furthermore, there are many cases where the slurry-like paste produced during the molding process has too much water content (too much moisture) compared to the solid component content, but this slurry-like paste is once dehydrated. Excess water is removed by treatment, and then the amount of water can be easily adjusted by adding an appropriate amount of water together with the solidifying agent to the dried paste, and this is also excellent in this respect. It will be.

Further, in the present invention, the slurry-like paste contains not only the solid component but also moisture, as well as the dried paste. When a concrete product is produced using the above as described above, the amount of water content relative to the solid component contained in the slot is an important factor that determines the concrete performance. In this regard, according to the present invention, based on the specific gravity of the solid component of Noro, the content of Noro solid component and the content of Noro water are determined from the volume and weight of Noro, respectively. Depending on the amount of moisture relative to the content, the water added to this slot (along with the solidifying agent) can be adjusted and set to an appropriate amount, which makes it possible to produce and realize concrete products with the required performance more reliably. This is a method for producing concrete with excellent properties.

In addition, in the invention described in claim 2 , blast furnace slag fine powder having high latent hydraulic property and extremely suitable as a solidifying agent of the present invention is adopted, and this blast furnace slag fine powder is easily available and inexpensive. In addition, since the quality is stable, the present invention can be implemented more easily and at a lower cost, and this is a method for producing a concrete product that can be realized more easily and has excellent practicality .

Also, in the invention of claim 3 and 4, wherein, similarly to the mix design of conventional cement concrete, cement and aggregates, the amount of coarse aggregate by properly adjusting set, other conditions and the This is a more excellent method for producing a concrete product that can easily adjust and set the concrete performance (various performances such as strength and workability) according to the intended use of the product.

  Embodiments of the present invention that are considered suitable (how to carry out the invention) will be briefly described with reference to the drawings, illustrating the operation of the present invention.

The Noro of Kokurito, kneaded by adding a solid agent and water that have a latent hydraulic.

  At this time, the alkali component of Noro acts as a stimulant for the latent hydraulic properties of the solidifying agent. In other words, the hydration reaction of the solidifying agent occurs due to the stimulating action of the alkali component of Noro, and the product is solidified well and the concrete product is manufactured well due to the formation of the hydrate generated by this hydration reaction. It will be possible.

  In this product produced in this way, the alkali component of Noro is consumed and neutralized during the hydration reaction of the solidifying agent as a stimulant for the latent hydraulic properties of the solidifying agent. In other words, the solidifying agent can be satisfactorily hydrated using Noro's original strong alkali, which has been impeding practicality, and at the same time, the strong alkali of Noro can be neutralized by this hydration reaction. Thereby, this product turns into a concrete product which can be used for various uses, such as a roadbed material, similarly to normal cement concrete.

  Therefore, the present invention uses a troublesome concrete noro which has been difficult to use due to its strong alkalinity and also requires a great deal of labor and cost to dispose. Concrete products that can be used for various purposes can be manufactured and realized, and even if it is desired to dispose of this product, it can be safely and easily disposed of because there is no influence of alkali contamination. This is a revolutionary and practical method for producing concrete products that is extremely suitable for recycling and disposal of the resulting waste.

  In addition, if the slurry-like paste produced during the molding process of concrete is used as it is, the moisture content may be too much compared to the content of the solid component contained in the paste, and the slurry-like paste with high fluidity may be used. Is difficult to handle and expensive to transport. In this respect, for example, if the slurry-like Noro is dehydrated, the volume can be reduced and the transportation cost can be reduced, and the water content can be reduced compared to the content of the solid component of Noro by dehydrating once. It can be avoided that the amount of water is too much, and the adjustment of the amount of water can be easily achieved by adding an appropriate amount of water together with the solidifying agent to the dewatered Noro when actually producing concrete products.

That is, if the amount of water is large, workability such as workability and consistency when placing in a placement location or a mold form is improved , but strength after solidification (molding) is low. According to the present invention, the adjustment and setting of the moisture content can be easily achieved, and thus the adjustment and setting of the performance of the concrete can be easily achieved according to, for example, the placement location and the intended use.

  Further, for example, if a solidifying agent or water is added to Noro, and cement, aggregate, or coarse aggregate is added, the alkali component is increased by adding cement, and the solidifying agent resulting from the stimulating action of the alkali component It is possible to improve the strength by generating a better hydration reaction and to adjust the strength by adjusting the amount of cement, for example, workability and increase by adjusting the amount of aggregate and coarse aggregate. Various performances such as weight can be adjusted and set, and it becomes possible to easily adjust and set the performance of concrete according to other conditions and the intended use of this product.

  Specific embodiments of the present invention will be described with reference to the drawings.

  In this example, a solidifying agent having a latent hydraulic property, or this solidifying agent and water are added to and kneaded with concrete, and the solidifying agent is hydrated by the stimulating action of the alkali component of the noro. Solidify and produce concrete products.

  Hereafter, the procedure of the manufacturing method of the concrete product of a present Example is demonstrated concretely based on FIG.

  Noro generated at the time of concrete molding such as centrifugal molding is collected in the form of a slurry in which a solid component having strong alkalinity mainly composed of calcium oxide (CaO) and moisture are mixed.

  Since this slurry-like paste contains not only solid components but also moisture as described above, it may be kneaded by adding a solidifying agent to this slurry-like paste, but in that case, the moisture content is adjusted and set. Since the performance of the product is not stable because it cannot be performed, and there is a problem of insufficient strength due to excessive moisture, in this embodiment, a slurry-like slurry is subjected to dehydration to drain excess moisture.

  The slurry-like dehydration treatment has been conventionally performed in various ways as in the above-described conventional example, and this example is also performed in the same manner as this conventional method.

  Specifically, as shown in FIG. 1, slurry-like paste is stored in a separation tank, solid components are deposited on the bottom, and collected by scooping up with a back-for or pumping up. .

  The collected deposits are dried in the sun to obtain a dry solid containing almost solid components from which water has been drained.

  As another method, as shown in FIG. 1, the slurry-like Noro is subjected to a centrifugal separator to separate Noro's moisture and solid components, and this becomes a dehydrated cake state in which excess moisture is drained. To obtain a dehydrated paste containing almost only solid components.

  In addition, as a dehydration process of Noro, not only said method but various methods are employable.

  In this way, by drying the slurry-like paste, it is possible to avoid an excessive moisture state, easily adjust the moisture amount to be set later, and reduce the cost during transportation.

  A solidifying agent and an appropriate amount of water are added to the dehydrating paste.

  In this embodiment, blast furnace slag fine powder that can be produced by drying blast furnace granulated slag produced as a by-product when producing pig iron in the blast furnace is adopted as the solidifying agent. This is very suitable as a solidifying agent in this example because it not only has high latent hydraulic properties but also can be easily obtained at low cost and with stable quality.

  The amount of the water added together with the solidifying agent should be at least the amount consumed by the hydration reaction of the solidifying agent. Further, based on the specific gravity of the solid component of Noro, the content of the Noro solid component and the content of Noro water are determined from the volume and weight of the Noro, respectively, and the water content relative to the content of the solid component of Noro is determined. The amount of water to be added to the slot is adjusted according to the content.

  Specifically, even if the drying treatment is performed, Noro contains not only a solid component but also a lot of moisture, so that the amount of moisture content relative to the solid component content is accurately grasped. This is important for the design of concrete performance.

  In other words, by setting a large amount of water, workability (workability and consistency) at the time of placing can be improved, but there is an effect of reducing the strength at the time of product, and the amount of water is set to be small. If you do, you will have the opposite effect. In this example, the specific gravity of Noro is set to 1.4, and based on the specific gravity of the solid component of Noro, the content of the solid component contained in Noro from the weight and volume of Noro, and the content of water contained in Noro The amount of the water to be added to the slot together with the solidifying agent is adjusted according to the amount of water relative to the solid component. In other words, a concrete product having a desired performance can be stably manufactured and realized by adjusting and setting the amount of the water to be mixed in the slot according to other conditions and the intended use of the product.

  As described above, a solidifying agent (ground powder of blast furnace slag) and an appropriate amount of water are added to knead and kneaded to cause a hydration reaction of the solidifying agent by the stimulating action of the alkali component of noro, thereby solidifying. A concrete product.

  In the present embodiment, when adding a solidifying agent and water to Noro, cement may be further added as necessary. When a large amount of cement is set, the alkali component of cement is added in addition to the alkali component of Noro, and the hydration reaction of the solidifying agent using this alkali component as a stimulant is further promoted to improve the strength of this product. obtain. That is, in this embodiment, the strength of the product can be adjusted and set by adjusting the amount of cement to be added in addition to the setting for adjusting the amount of the solidifying agent and water.

  Furthermore, not only cement but also aggregates and coarse aggregates are added, and as with ordinary cement concrete, various adjustments such as strength, workability, product weight, density, etc. The concrete performance can be adjusted and set, or the present embodiment can be used as an extender for ordinary cement concrete.

  Since the present embodiment is as described above, it is difficult to use because it has a strong alkalinity so far. Like concrete, concrete products that can be used for various purposes such as roadbed materials can be manufactured and realized. It is also possible to easily adjust the strength and other concrete performance according to other conditions and the intended use of the product. Furthermore, if it is desired to discard this product, it is possible to dispose of it safely and easily because there is no concern about alkali contamination.

  Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

It is process explanatory drawing of the manufacturing method of the concrete product which concerns on a present Example.

Claims (4)

The slurry-like slurry generated during the molding process of the concrete is dehydrated, and the dehydrated slurry is mixed with a solidifying agent having latent hydraulic properties and water and kneaded. Based on the specific gravity of the solid component, the content of the noro solid component and the content of the moisture of the noro are obtained from the volume and weight of the noro, respectively, and the amount of the moisture content relative to the content of the solid component of the noro is calculated. A method for producing a concrete product, characterized in that the solidifying agent is hydrated and solidified by an irritating action of an alkali component possessed by Noro to obtain a concrete product. Examples solidifying agent, method for producing a concrete product according to claim 1, characterized by using a blast furnace slag. The slag, before Symbol solidifying agent, water, and kneaded by adding cement, according to claim 1, 2 or one of which is characterized by adjusting sets the intensity by setting the amount of the cement A method for manufacturing concrete products. The method for producing a concrete product according to any one of claims 1 to 3 , wherein an aggregate or a coarse aggregate is added and kneaded to the slot.

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