JP4112422B2 - Method for producing porous concrete block using large coarse aggregate - Google Patents

Description

【００５８】
表１に示された実験結果から明らかなように、結合材のフロー値を変化させることでコンクリートへの付着率が変化することが確認され、本発明による結合材が持つフロー値において高い付着率が発現されることが明らかとなった。
【００５９】
次に、粗骨材表面を流下する結合材の、粗骨材への付着に関する実験を行い、付着状態を目視にて確認した。具体的には、図３に示されている如き一対の円柱形の実験用コンクリートブロック１６′，１６′を採用して、これらのブロック１６′，１６′の外周面への図３に示す各部位：ａ〜ｎにおける結合材の付着厚さを測定した。その結果を図５に示す。
【００６０】
より詳細には、かかる流下実験は、大粒径の粗骨材を想定したφ１０×２０ｃｍのコンクリート製円柱試験体（１６′，１６′）２本を鉛直方向に重ね合わせて配置し、その上端部から２リットルの結合材１８を流下させた。なお、セメントとしては普通ポルトランドセメント、細骨材として川砂を使用し、混和剤としてポリカルボン酸系高性能ＡＥ減水剤を添加することによって得られた結合材１８を採用した。これらの調合としては、表２に示すように、水／セメント比（Ｗ／Ｃ）を０．２２に固定し、細骨材／結合材容積比（Ｓ／ｍ）およびフロー値を変化させた。フロー値については、混和剤／セメント比（Ｓｐ／Ｃ）を調節することで変化させた。結合材流下後の試験体の養生は気中養正とし、結合材硬化後に、試験体を約５ｃｍの厚さで４等分の輪切りにし、その切断面の結合材の付着厚さを計測した。
【００６１】
試験体の結合材硬化後の切断面の様子を図４に示す。結合材のフロー値が小さすぎる（結合材が硬すぎる）場合には、図４（ｃ）に示すように、該結合材が粗骨材に対して偏って被着してしまい、該粗骨材全体に亘って均一に被着しない。一方、結合材のフロー値が大きすぎる（結合材が柔らかすぎる）場合は、図４（ｂ）に示すように、適度な層厚を持って被着することが困難である。本実験により、本発明の結合材が持つフロー値の範囲内において、図４（ａ）に示すように、粗骨材の略全体に亘って適度な層厚を持って結合材を被着せしめることが可能であることが確認された。
【００６２】
次に、試験体の図３に示す箇所について、結合材の付着厚さを測定した結果を図５に示す。本実験によっても、前記同様の結果が確認され、本発明の結合材が持つフロー値によって、粗骨材の表面に比較的均一に結合材が被着せしめられることが確認された。
【００６３】
【表２】

【００６４】
一方、水／セメント比（Ｗ／Ｃ）を０．２５、細骨材／結合材容積比（Ｓ／ｍ）を０．３５、混和剤／セメント比（Ｓｐ／Ｃ）を１．０，フロー値を１８３ｍｍに調整した結合材を、粒径が２０ｃｍ程度で約１２個のコンクリート塊に対して吹き付け、本発明に従うポーラスコンクリートブロックを得た。ここにおいて、モルタル結合材強度は１００ＭＰａ程度で、ポーラスコンクリートブロックの重量は約２６０Ｋｇであった。そして、ポーラスコンクリートブロック上部２箇所にワイヤを挿通し、吊り上げたところ問題無く搬送することが出来ることを確認した。
【００６５】
そして、かかるポーラスコンクリートブロックを、長さ４５ｍ、幅３ｍ、水深１．５ｍの造波潮流水路に設置し、本発明によるポーラスコンクリートブロックを海底に設置した場合の安定性について確認実験を行なった。本実験は、表３に示す潮流のみと、表４に示す潮流および規則波を発生させて、かかるポーラスコンクリートブロックの移動の有無を確認した。その結果、全ての条件において本発明によるポーラスコンクリートブロックが移動しないことが確認され、本実験により本発明によるポーラスコンクリートブロックの漁礁としての適用が可能であることが認められた。
【００６６】
【表３】

【００６７】
【表４】

【００６８】
以上、本発明の実施形態について詳述してきたが、これらはあくまでも例示であって、本発明は、かかる実施形態における具体的な記載によって、何等、限定的に解釈されるものではない。
【００６９】
特に、本発明に従い製造されたポーラスコンクリートブロックの用途は、何等、限定されるものではない。例えば、前記実施形態では、かかるポーラスコンクリートブロックを海底に設置せしめることで漁礁として適用したが、該ポーラスコンクリートブロックの空隙に培土を充填し、植樹に利用したり、着生初期の草木を保護するために河岸の法面等に敷設する等の適用も、本発明の範囲に含まれるものであることは言うまでもない。
【００７０】
【発明の効果】
上述の説明から明らかなように、本発明に従う大型粗骨材を用いたポーラスコンクリートブロックの製造方法は、従来再利用不可能とされていた大粒径の廃棄コンクリート塊を再利用可能とするものであり、大粒径の粗骨材を利用することにより、廃棄コンクリートの破砕や分別の為の工数を低減し、今後大量に発生すると予想される廃棄コンクリートを有効に利用することが可能となるのである。
【図面の簡単な説明】
【図１】 本発明の一実施例としてのポーラスコンクリートブロックを用いた漁礁を示す断面説明図である。
【図２】 本発明に従う製造方法の一実施形態を概略的に示すモデル図である。
【図３】 実験に際して結合材の付着厚さを計測する箇所を説明する説明図である。
【図４】 結合材の粗骨材への付着実験を説明するためのモデル図である。
【図５】 結合材の付着厚さを計測した実験の結果を示すグラフである。
【符号の説明】
１０ ポーラスコンクリートブロック
１６ 大型粗骨材
１８ 結合材
２０ 空隙 [0001]
【Technical field】
  The present invention makes it possible to advantageously use a large waste concrete block having a particle size of 40 mm or more as a fishing reef.TakoCleat blockOfThe present invention relates to a novel manufacturing method.
[0002]
[Background]
  In recent years, awareness of the environment has increased, and efforts aimed at creating a recycling-oriented society that reuses various types of waste generated in production activities have been carried out in various fields. Under such circumstances, disposal of waste concrete generated after dismantling of concrete structures frequently used in the fields of civil engineering and architecture has become a problem. Conventionally, as an aspect of reuse of the waste concrete, most of the waste concrete generated after dismantling of the concrete structure is crushed and used as a roadbed material. However, in the future when many concrete structures approaching the end of their useful life will occur, the amount of waste concrete will continue to increase. Therefore, the estimated amount of waste concrete generated will exceed the demand for roadbed materials around 2005. It is also said. Therefore, the development of a new application for effectively reusing waste concrete has become an urgent task.
[0003]
  In addition, when reusing waste concrete as roadbed material, the particle size must be crushed to 40 mm or less, the processing is troublesome, considerable equipment and energy are required, and time and cost are also required. There was a problem. From this point of view, simple and beneficial measures for reuse other than roadbed materials have been desired for waste concrete.
[0004]
  Although it has been proposed to classify waste concrete and use it as aggregate for recycled concrete, etc., it requires higher crushing and sorting than when used for roadbeds, which is a considerable amount for realizing this. Since equipment, costs, and time are required, it is difficult to expect an increase in demand.
[0005]
  In addition, when crushing waste concrete to a particle size of 40 mm or less, it is easy to generate fine powder of concrete with a particle size of 5 mm or less, and a particle size of 25 mm or less, especially required for recycled concrete applications, is achieved. In order to do so, it is difficult to avoid an increase in the amount of generated concrete fine powder, and there are concerns about air pollution and adverse effects on the surrounding environment. Therefore, there has been a problem that the aspect of the reuse of waste concrete that has been conventionally adopted or studied is not necessarily environmentally desirable.
[0006]
[Solution]
  Here, the present invention has been made in the background as described above, and the solution is to realize reuse of waste concrete while suppressing labor, energy, and cost required for crushing and the like. New and useful structures that can be dampedSimple and effective production methodIs to provide.
[0007]
[0008]
[Solution]
  Hereinafter, the aspect of this invention made | formed in order to solve such a subject is described. In addition, the component employ | adopted in each aspect as described below is employable by arbitrary combinations as much as possible. In addition, aspects or technical features of the present invention are not limited to those described below, but are described in the entire specification and drawings, or can be understood by those skilled in the art from those descriptions. It should be understood that it is recognized on the basis of.
[0009]
(Concrete blockManufacturing methodAspects of the invention 1)
  The present invention relates to a method for manufacturing a porous concrete block.The first aspect of the present invention is, JLarge coarse aggregate made of discarded concrete block with a size of 40mm or more in accordance with IS-A-5380Are installed in a single layer,A binder using a mortar having a flow value of 150 to 300 mm in a physical test according to JIS-R-5201.Are applied to the surface of the large coarse aggregate by spraying on the large coarse aggregate installed in such a single layer, and the large coarse aggregates are stacked one by one, and the large coarse aggregates are applied. By alternately repeating the spraying of the binder on the aggregate, the stacked height of the large coarse aggregate is gradually increased, and then the binder is solidified,Each contact part of large coarse aggregateWith the binderSticking to each otherCoughTo form a continuous void as a whole between these large coarse aggregates.It is characterized by doing.
[0010]
  In accordance with this embodimentUkoCleat blockManufacturing methodOne of the major features is that a concrete block which is a large coarse aggregate having a particle size of 40 mm or more, which has been difficult to reuse, can be used as it is. Then, a bonding material using a specific mortar having a flow value (150 to 300 mm) larger than that of a general mortar to be worn such as spraying is adopted, and the contact portions of the concrete blocks are fixed to each other. This is also a major feature. Furthermore, according to this aspectUkoCleat blockManufacturing methodIn this method, the binder is applied to the large coarse aggregate in such a manner that it is applied to the surface of the large coarse aggregate without using the kneading of the aggregate and mortar generally used in the production of concrete products including porous concrete. This is also one of the major structural features.
[0011]
  MaIn addition, the particle size of the concrete lump adopted in this embodiment is JIS-A in consideration of the man-hour required for forming a gap having a suitable size and the crushing process, conveyance and handling at the time of manufacturing the porous concrete block, and the like. A concrete lump having a particle size of 40 mm or more and a particle size of 500 mm or less is more preferably adopted according to the -5380 regulation.
[0012]
  By adopting such a plurality of characteristic configurations in combination with each other,UkoCleat blockManufacturing method, It is possible to adopt a large coarse aggregate with a particle size of 40 mm or more, which has been difficult to use as an aggregate for concrete in the past, and has a novel structure with a large number of through holes by continuous large gaps Porous concrete block is a thingManufacturingIt was to be done. In particular, in this embodiment, the conventional coarse kneading (kneading) is not adopted, and the binding material is applied so as to be applied to the coarse aggregate, so that the large coarse aggregate is larger than the conventional kneading. It is no longer necessary to actively move the product by rolling it, and the manufacturing equipment is simple. And by adopting a bonding material adhesion structure by applying in combination with a mortar with a specific flow value as described above, the bonding material is advantageously applied to the surface of the coarse aggregate even for large size coarse aggregates. The target porous concrete block can be attached by firmly and stably connecting and fixing a plurality of large coarse aggregates.ManufacturingIt can be done.
[0013]
  That is, in the case of producing porous concrete using a large coarse aggregate having a particle size of 40 mm or more, the area of the contact portion between the coarse aggregates is larger than when using a small diameter aggregate. However, since it becomes smaller with respect to the volume and weight of the coarse aggregate, there is a problem that it is difficult to ensure the bonding force between the coarse aggregates. Adopting a binding material using a specific mortar with a relatively large flow value, and attaching the binding material to the aggregate surface in a smeared form that is not kneaded, so that the coarse aggregates come into contact with each other It was possible to easily realize the fixing structure that can exert the fixing force by building up the binding material at the site, thereby sufficiently and stably fixing the bonding strength between the large coarse aggregates. You can get it.
[0014]
  In this embodiment, it is not desirable to use a special additive that contributes to promoting the setting of cement, such as a quick setting material, in the mortar constituting the binder. Moreover, in this aspect, a binder having a binder strength of 50 MPa or more, preferably 80 MPa or more is suitably employed as a binder in a 28-day material age. And, such a suitable aspect such as not using a quick setting material or having a particularly large bonding material strength is, for example, in terms of configuration compared to a mortar for spraying used in tunnel construction or the like. This is a significant difference, and the features of the present invention will be recognized more remarkably.
[0015]
  In addition, in this embodiment, the waste concrete can be reused with a sufficiently large particle size of 40 mm or more as compared with the conventional embodiment of reuse of the waste concrete for roadbeds and the like. Therefore, crushing and separation of waste concrete can be simplified, and the required labor, energy, and cost can be reduced, and the generation of fine powder of concrete due to crushing can be suppressed. This environmental problem can also be reduced or avoided.
[0016]
  In addition, if the flow value of the binder used is smaller than 150 mm, it becomes difficult to spread the binder substantially uniformly on the surface of the coarse aggregate, and in some cases, there may be a portion where the binder does not exist. On the other hand, it is difficult to obtain a stable bonding force between the coarse aggregates due to the bonding material due to the occurrence of a portion where the bonding material is excessively built up. On the other hand, if the flow value of the binder to be used exceeds 300 mm, it becomes difficult for the binder to flow down the surface of the coarse aggregate, and it is difficult to ensure a sufficient layer thickness of the binder. It becomes difficult to gain power.
[0017]
  In addition, the type of cement employed for the binder in the present invention is not particularly limited, and various conventionally known cements can be appropriately employed, but ordinary portland cement and blast furnace cement are preferably employed. The Furthermore, various fine aggregates can be appropriately employed as the fine aggregate for mortar, but river sand and crushed sand are preferably employed. Wastes such as limestone powder and glass fiber scraps can be used as the admixture, and it is also effective to use silica fume or the like in order to reduce rebound when the binder is applied to the coarse aggregate.
Further, according to the manufacturing method of this aspect, since the binding material is attached to the aggregate by spraying, the porous concrete having a structure according to the present invention as described above with a small equipment without preparing a large equipment. The block can be manufactured easily and with excellent workability.
Furthermore, according to the manufacturing method of this aspect, even when forming a large porous concrete block made of a large number of coarse aggregates, porous concrete is formed by covering the coarse aggregates in stages and stacking them. It is possible to easily cover the binding material up to the coarse aggregate located inside the block. Therefore, the work for evenly attaching the binding material to all the coarse aggregates becomes easy, and when manufacturing large-sized concrete blocks, sufficient binding material is provided at the connection sites of each coarse aggregate. It becomes possible to secure the fixing strength between the coarse aggregates more stably.
[0018]
(Concrete blockManufacturing methodAspect 2 of the present invention concerning)
  A second aspect of the present invention is a porous concrete block according to the first aspect.Manufacturing methodAs the mortar, a fine aggregate having a size of 5.0 mm or less according to JIS-A-5380 is blended in an amount of 0.20 to 0.50 in a fine aggregate / mortar volume ratio. It is characterized by adopting things. Porous concrete block according to this embodimentManufacturing methodIn the above-described flow value, appropriate build-up and formability of the binding material deposited on the surface of the coarse aggregate can be realized more advantageously.
[0019]
(Concrete blockManufacturing methodAspect 3 of the present invention concerning)
  A third aspect of the present invention is the porous concrete block according to the first aspect or the second aspect.Manufacturing methodThe binder is deposited with a layer thickness of 2 mm or more over substantially the entire surface of the large coarse aggregateDoThis is a feature. Porous concrete block according to this embodimentManufacturing methodIn this case, it is possible to more advantageously secure the fixing strength between the contact surfaces with a small amount of coarse aggregates, and it is possible to more advantageously form an appropriately sized gap between the coarse aggregates. It becomes possible. Note that the layer thickness of the binder may be 2 mm or less between the contact portions where the coarse aggregates are bonded to each other, and the coarse aggregates may be in direct contact with each other.
[0020]
(Concrete blockManufacturing methodAspect 4 of the present invention concerning)
  A fourth aspect of the present invention is a porous concrete block according to any one of the aspects 1 to 3.Manufacturing methodThe binder is characterized by adopting a high-performance AE water reducing agent added to the mortar. Porous concrete block according to this embodimentManufacturing methodIn this case, moderate fluidity and moldability are imparted to the mortar having the flow value, and the binding material can be easily applied to the surface of the coarse aggregate. In addition, as addition amount of this high performance AE water reducing agent, the range of 0.1-5.0% of cement weight is employ | adopted suitably. Here, as such a high-performance AE water reducing agent, known ones can be appropriately employed. Specifically, for example, trade name: PARIC FP300U manufactured by Sunflow Palic Co., Ltd., or manufactured by NMB Co., Ltd. Product names: Leo Build SP-8S, product names manufactured by Kao Corporation: Mighty 3000H, etc.
[0021]
(Concrete blockManufacturing methodAspect 5 of the present invention concerning)
  A fifth aspect of the present invention is a porous concrete block according to any one of the aspects 1 to 4.Manufacturing methodThe binder is characterized by adopting a material obtained by adding a setting retarder to the mortar. Porous concrete block according to this embodimentManufacturing methodIn,When the binding material is sprayed on the coarse aggregate that has been piled up, and the binding material is allowed to flow down over time by the action of gravity, the binding material is roughened when it is covered with the binding material so as to cover the surface of the coarse aggregate. It is possible to prevent a decrease in fluidity due to the progress of condensation before the aggregate surface is spread. Therefore, it is easy to spread and attach the binding material to the surface of the coarse aggregate by using the gravitational action in this way, and the fixing strength of the coarse aggregate exhibited by the applied binding material is further stabilized. Can get. NaIf too much of such a setting retarder is added, the mortar may be hardened. Therefore, it is desirable to add 1.0% or less of the setting retarder to the cement weight. Here, as this setting retarder, a well-known thing can be employ | adopted suitably. Specifically, for example, trade name: PARIC T manufactured by Sunflow Palic Co., Ltd. is exemplified.
[0022]
[0023]
[0024]
(Concrete blockManufacturing methodAspects of the invention with respect to6)
  First of the present invention6Aspects 1 to 1 above5Porous concrete block according to any ofPorous concrete manufactured by the manufacturing method ofThe invention features a fishing reef constructed by installing such a porous concrete block on the seabed. A fishing reef constituted by a porous concrete block having a specific structure according to this embodiment has a large continuous through hole that could not be realized with conventional porous concrete, and therefore, particularly large shrimp. It can be advantageously employed as a fishing reef inhabited by shellfish, shellfish and fish. That is, in the past, when it was attempted to provide a concrete reef having a continuous gap with a size large enough to be used as a reef, it would be possible to mold it, but it would result in a considerably large and complex mold structure. Therefore, it is expensive in terms of cost, and not always realistic. However, according to this aspect, it is possible to easily and inexpensively provide fishing reefs using the concrete waste material, and the effect of environmental conservation can be exhibited by recycling the waste material. In particular, by adopting a large concrete lump, a relatively large gap can be easily formed, and such a gap is suitably used as a habitat for large shrimps, shellfish, fish and the like.
[0025]
  In addition, the above-mentioned sea bottom to which the reef according to this aspect is applied is not limited to the sea bottom, and includes various places where aquatic organisms such as river bottoms and lake bottoms inhabit. desirable. However, since seawater originally has a high pH and is inhabited by biological systems that are resistant to alkali, and there is little influence of alkali on living organisms due to porous concrete blocks, it is thought that there are almost no adverse effects or problems on environmental pollution and biological solids. Because it is.
[0026]
[0027]
[0028]
[0029]
[0030]
[0031]
[0032]
[0033]
[0034]
[0035]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.
[0036]
  First, when manufacturing a porous concrete block using a large coarse aggregate, a binder for combining these large particle aggregates is prepared. Ordinary Portland cement is used as the cement, and river sand is used as the fine aggregate. In addition, the thing according to JIS-A-5380 prescription | regulation that the size of the river sand as a fine aggregate is 5.0 mm or less is employ | adopted suitably. Here, the size according to JIS-A-5380 is 5.0 mm or less, which means that the passing rate through a 5.0 mm sieve is 85% or more. As the admixture, a polycarboxylic acid-based high-performance AE water reducing agent is used, and here, the above-mentioned water non-separation agent and setting retarder may be added together. Furthermore, it is possible to use blast furnace cement as the cement or crushed sand as the fine aggregate as appropriate. Then, the water / cement ratio is adjusted in the range of 0.2 to 0.35 and the fine aggregate / binding material volume ratio is adjusted in the range of 0.2 to 0.5, and kneading is performed. The kneading time is desirably 270 seconds or longer, and it is desirable that the cement and fine aggregate be kneaded in an empty manner for kneading the binder.
[0037]
  In addition, evaluation of a binding material is performed by measuring a 15 shot flow value based on the physical test of JIS-R-5201 cement. Here, in consideration of the ease of the operation of spraying the bonding material and the adherence of the bonding material to the coarse aggregate, the 15-stroke flow value is desirably 150 to 210 mm. In this way, the binder in the present invention is obtained.
[0038]
  Next, a large coarse aggregate obtained by crushing waste concrete is prepared. As such large coarse aggregates, those having a size in accordance with JIS-A-5380 regulations of 40 mm or more are adopted, and concrete lumps having a size in accordance with JIS-A-5380 regulations of 500 mm or less are more preferably adopted. . Here, the size in accordance with JIS-A-5380 is 40 mm or more means that the residual rate applied to a 40 mm sieve is 85% or more.
[0039]
  Hereinafter, the manufacturing method of the porous concrete block using the large coarse aggregate by the binder and the coarse aggregate prepared as described above and the porous concrete block using the large coarse aggregate are exemplified in FIG. One example of a method for manufacturing the reef 10 is illustrated.
[0040]
  First, as shown in FIG. 2, after accumulating an appropriate number of large coarse aggregates 16 prepared as described above, the binder 18 prepared separately as described above is applied to a sprayer (not shown). After filling, as shown in FIG. 2 (a), it sprays on the surface of the large coarse aggregate 16 piled up from the nozzle 30 of the spraying machine. As this spraying machine, the well-known spraying machine used for construction of sprayed concrete can be used. As will be described later, the spraying is performed from an appropriate direction so that the binding material 18 reaches the coarse aggregate positioned inside the stacked concrete block by the flow of the binding material 18.
[0041]
  Then, the binding material 18 sprayed on the upper surface of the stacked large coarse aggregate 16 flows down along the surface of the large coarse aggregate 16 due to the gravity action, so that the binding material 18 is moved to each large coarse aggregate. Sixteen surfaces can be applied substantially throughout. The layer thickness of the binding material 18 on the surface of the large coarse aggregate 16 is desirably adjusted to be substantially constant at 2.0 mm or more. As a result, the bonding material 18 is attached to substantially the entire surface of all large coarse aggregates 16 and covers the contact portions of the large coarse aggregates 16 with a predetermined thickness. As the binding material 18 condenses, the plurality of large coarse aggregates 16 are fixed to each other. Here, since the binding material 18 having the flow value as described above flows down along the surface of the large coarse aggregate 16 and excessive build-up is also avoided, the large coarse aggregate 16 is interposed between the large coarse aggregates 16. The void 20 having an appropriate size is continuously formed as a whole.
[0042]
  As shown in FIG. 2B, a large coarse aggregate 16 is further stacked on the concrete block 12 obtained by such a manufacturing method. Thereafter, similarly to the coarse aggregates stacked on the lower part, the large coarse aggregates 16 are sprayed to bond the large coarse aggregates 16 to each other. The porous concrete block 10 using the large coarse aggregate of a desired size is obtained by alternately repeating the stacking of the large coarse aggregate 16 and the spraying of the binder 18 an appropriate number of times. In the finally obtained porous concrete block 10, the voids 20 formed inside are continuously made as a whole. Further, FIG. 2 is a model diagram for simplifying the explanation, and actually, as shown in FIG. 1, large coarse aggregates 16 of various shapes obtained by crushing appropriate concrete structures are used. Manufactured using.
[0043]
  In addition, although the number of stages of stacking the large coarse aggregate 16 that sprays the binding material 18 at a time can be arbitrarily set in the judgment of the practitioner from the size of the coarse aggregate, the topography of the construction site, the number of man-hours, The method of spraying the binder each time the large coarse aggregate 16 is stacked one or two layers can obtain the adhesion strength between the coarse aggregates most stably.
[0044]
  The porous concrete block 10 using the large coarse aggregate obtained in this way is lifted by using a wire inserted into the gap, for example, by an appropriate crane device, submerged in water, and placed on the bottom of the seabed or the like. By installing it, it is possible to obtain a fishing reef with a porous concrete block using such a large coarse aggregate. As for the installation of the porous concrete block 10 using such a large coarse aggregate on the seabed, the porous concrete block 10 is manufactured on the net, and the porous concrete block 10 is lifted by the net when transported. May be conveyed.
[0045]
[0046]
[0047]
[0048]
[0049]
[0050]
[0051]
[0052]
[0053]
[0054]
  Moreover, the porous concrete block 10 obtained in this way is, for example, a net.WoodAnd transport it to the installation location by truck, ship, etc.WoodIt may be lifted with a crane or the like, and the net material may be set down on the desired seabed or the like. Net like thisWoodIf the installation mode is adopted, installation of a large porous concrete block manufactured in the atmosphere becomes easy. The netMaterialFor example, selecting a material that disappears due to corrosion does not cause a big problem.
[0055]
[0056]
  Further, Table 1 shows the results of an experiment for confirming the adhesion rate of the binder having the flow value according to the present invention to the concrete block by spraying. The experiment was carried out by using a mortar as the binder and spraying the binder onto a 30 cm × 30 cm × 6 cm concrete plate installed perpendicular to the spraying machine. The distance from the tip of the sprayer nozzle to the concrete flat plate was 30 cm. In addition, normal Portland cement was used as the cement, river sand was used as the fine aggregate, and a polycarboxylic acid-based high-performance AE water reducing agent was added as an admixture. In these preparations, the fine aggregate / binding material volume ratio (S / m) is fixed at 0.35, the admixture / cement ratio (Sp / C) is fixed at 1.0, and the water / cement ratio (W / C). ) Was adjusted to change only the flow value. Such a binder was sprayed onto a concrete flat plate, and the adhesion rate after spraying was confirmed. In addition, the mixing amount of one batch of the binder was 7 liters, and spraying was performed by collecting 2 kg from the mixture.
[0057]
[Table 1]

[0058]
  As is clear from the experimental results shown in Table 1, it was confirmed that the adhesion rate to the concrete was changed by changing the flow value of the binder, and the high adhesion rate at the flow value of the binder according to the present invention. Was revealed to be expressed.
[0059]
  Next, an experiment on the adhesion of the binding material flowing down on the surface of the coarse aggregate to the coarse aggregate was performed, and the adhesion state was visually confirmed. Specifically, figure3A pair of cylindrical concrete concrete blocks 16 'and 16' as shown in FIG.3The adhesion thickness of the binding material at each site indicated by: a to n was measured. Fig.5Shown in
[0060]
  More specifically, this flow-down experiment was conducted by placing two concrete cylindrical test specimens (16 ′, 16 ′) of φ10 × 20 cm on the assumption that a coarse aggregate with a large particle size was superposed in the vertical direction, and its upper end. 2 liters of the binding material 18 was allowed to flow down from the part. In addition, normal Portland cement was used as cement, river sand was used as fine aggregate, and a binder 18 obtained by adding a polycarboxylic acid-based high-performance AE water reducing agent as an admixture was employed. In these formulations, as shown in Table 2, the water / cement ratio (W / C) was fixed at 0.22, and the fine aggregate / binding material volume ratio (S / m) and the flow value were changed. . The flow value was changed by adjusting the admixture / cement ratio (Sp / C). Curing of the test specimen after flowing down the binder was carried out in the air, and after curing the binder, the specimen was cut into four equal parts with a thickness of about 5 cm, and the adhesion thickness of the binder on the cut surface was measured. .
[0061]
  Figure shows the state of the cut surface of the test specimen after curing the binder4Shown in If the flow value of the binder is too small (the binder is too hard)4As shown in (c), the binding material is biased to the coarse aggregate and is not uniformly deposited throughout the coarse aggregate. On the other hand, if the flow value of the binder is too large (the binder is too soft)4As shown in (b), it is difficult to deposit with an appropriate layer thickness. By this experiment, within the range of the flow value of the binding material of the present invention,4As shown in (a), it was confirmed that it was possible to deposit the binder with an appropriate layer thickness over substantially the entire coarse aggregate.
[0062]
  Next, a diagram of the specimen3Figure shows the results of measuring the adhesion thickness of the binder for the locations shown in5Shown in Also in this experiment, the same result as above was confirmed, and it was confirmed that the binding material was relatively uniformly deposited on the surface of the coarse aggregate by the flow value of the binding material of the present invention.
[0063]
[Table 2]

[0064]
  On the other hand, water / cement ratio (W / C) is 0.25, fine aggregate / binding material volume ratio (S / m) is 0.35, admixture / cement ratio (Sp / C) is 1.0, flow The binder whose value was adjusted to 183 mm was sprayed on about 12 concrete blocks having a particle size of about 20 cm to obtain a porous concrete block according to the present invention. Here, the strength of the mortar binder was about 100 MPa, and the weight of the porous concrete block was about 260 kg. And it was confirmed that the wire could be transported without problems when the wire was inserted into the upper two places of the porous concrete block and lifted.
[0065]
  Then, the porous concrete block was installed in a wave tidal channel having a length of 45 m, a width of 3 m, and a water depth of 1.5 m, and a confirmation experiment was performed on the stability when the porous concrete block according to the present invention was installed on the seabed. In this experiment, only the tidal current shown in Table 3 and the tidal current and regular wave shown in Table 4 were generated to confirm the presence or absence of the movement of the porous concrete block. As a result, it was confirmed that the porous concrete block according to the present invention did not move under all conditions, and this experiment confirmed that the porous concrete block according to the present invention can be applied as a fishing reef.
[0066]
[Table 3]

[0067]
[Table 4]

[0068]
  As mentioned above, although embodiment of this invention was explained in full detail, these are illustrations to the last, Comprising: This invention is not interpreted limitedly by the specific description in this embodiment.
[0069]
  In particular, according to the present invention.ManufacturingThe use of the made porous concrete block is not limited at all. For example, in the above-described embodiment, the porous concrete block is applied as a fishing reef by installing it on the seabed. Therefore, it goes without saying that the application of laying on the slope of the riverbank is also included in the scope of the present invention.
[0070]
【The invention's effect】
  As is apparent from the above description, according to the present invention.UdaiPorous concrete block using type coarse aggregateOfThe manufacturing method makes it possible to reuse large-sized waste concrete lump that was previously impossible to reuse. By using coarse aggregate of large particle size, waste concrete can be crushed and separated. Therefore, it is possible to reduce the man-hours required to effectively use waste concrete that is expected to be produced in large quantities in the future.
[Brief description of the drawings]
FIG. 1 is a cross-sectional explanatory view showing a fishing reef using a porous concrete block as one embodiment of the present invention.
FIG. 2 is a model diagram schematically showing one embodiment of a manufacturing method according to the present invention.
[Figure3It is an explanatory view for explaining the location where the adhesion thickness of the binding material is measured in the experiment.
[Figure4] A model diagram for explaining an experiment of adhesion of a binding material to a coarse aggregate.
[Figure5A graph showing the result of an experiment in which the adhesion thickness of a binder was measured.
[Explanation of symbols]
10 Porous concrete block
16 Large coarse aggregate
18 Binder
20 skyGap

Claims (6)

A large coarse aggregate consisting of discarded concrete blocks with a size of 40 mm or more according to JIS-A-5380 is installed in a single layer, and a mortar with a flow value of a physical test in accordance with JIS-R-5201 of 150 to 300 mm is used. the binding material used, and accumulation of such by spraying against installing the large coarse aggregate in a single layered allowed deposited on the surface of the large-sized coarse aggregate, layer by layer of large-sized coarse aggregate, they large By alternately repeating the spraying of the binding material on the coarse aggregate, the stacking height of the large coarse aggregate is gradually increased , and then the binding material is solidified, so that the large coarse aggregate is solidified. Porous concrete block using a large coarse aggregate, wherein the abutting portions of the large coarse aggregate are fixed to each other with the binder to form a continuous void as a whole between the large coarse aggregates. Manufacturing method. As the mortar, a mixture of fine aggregates having a size of 5.0 mm or less according to JIS-A-5380 is used in an amount of 0.20 to 0.50 in a fine aggregate / mortar volume ratio. Item 2. A method for producing a porous concrete block according to Item 1. The method for producing a porous concrete block according to claim 1 or 2, wherein the binding material is applied with a layer thickness of 2 mm or more over substantially the entire surface of the large coarse aggregate. The manufacturing method of the porous concrete block in any one of Claim 1 thru | or 3 which employ | adopted what added the high performance AE water reducing agent to the said mortar as said binder. The method for producing a porous concrete block according to any one of claims 1 to 4, wherein a material obtained by adding a setting retarder to the mortar is used as the binder. A fishing reef comprising a porous concrete block manufactured according to the method for manufacturing a porous concrete block according to any one of claims 1 to 5 , installed on the seabed.

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