JP4515294B2 - Method for producing chip-based mixture - Google Patents
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- JP4515294B2 JP4515294B2 JP2005066864A JP2005066864A JP4515294B2 JP 4515294 B2 JP4515294 B2 JP 4515294B2 JP 2005066864 A JP2005066864 A JP 2005066864A JP 2005066864 A JP2005066864 A JP 2005066864A JP 4515294 B2 JP4515294 B2 JP 4515294B2
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- 239000000203 mixture Substances 0.000 title claims description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 150
- 239000002023 wood Substances 0.000 claims description 117
- 238000004898 kneading Methods 0.000 claims description 22
- 238000001035 drying Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 claims description 6
- 238000012937 correction Methods 0.000 description 8
- 238000010521 absorption reaction Methods 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000004568 cement Substances 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000000717 retained effect Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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本発明は、混練材料として木材チップを使用する場合に、木材チップは水を保水または放出することから、この水を適切に設定してチップ系混合物を製造するためのチップ系混合物の製造方法に関する。 The present invention is, when using wood chips as mixing materials, wood chips since the water retention or release water, a method of manufacturing a chip-based mixture for producing a chip-based mixture by setting the water properly .
従来、木材チップをチップ系混合物の混練材料として使用する技術には、例えば特許文献１のように、木材をチップ化してコンクリートに混入するようにし、これにより植物の植生基盤を形成する「コンクリートおよびコンクリートの植生方法」が知られている。
木材チップは、混練材料として通常使用される砂や砕石などの材料と比較して、乾燥状態では顕著な吸水性を示し、また湿潤状態では圧力の作用によって容易に水を放出するという性質がある。従って、木材チップを混練材料として使用する際には、添加した水が吸水されてしまったり、あるいは混練時の撹拌圧力などで、内部から水が放出されることに配慮する必要がある。 Wood chips have a characteristic of exhibiting remarkable water absorption in a dry state and easily releasing water by the action of pressure in a wet state, compared to materials such as sand and crushed stone that are usually used as kneading materials. . Therefore, when using wood chips as a kneading material, it is necessary to consider that the added water is absorbed or that water is released from the inside due to stirring pressure during kneading.
また、これら吸水性や水の放出作用に影響することとなる、木材チップがその内部に保水できる水量は、原木の種類だけでなく、材令や生木であるか枯れ木であるかの相違、そしてまた、どの程度腐食しているのかなどの原木の状態や、チップ化後から使用されるまでの状況、具体的にはすぐに使用されるのか相当期間放置されるのか、また保管が屋外なのか屋内なのか等の状態によって異なる。 In addition, the amount of water that wood chips can retain in the interior, which will affect the water absorption and water release action, is not only the type of raw wood, but also the difference between timber and raw or dead trees, In addition, the condition of the raw wood, such as how much it corrodes, the situation until it is used after chipping, specifically whether it is used immediately or left for a considerable period of time, and storage is outdoors. It depends on whether it is indoor or indoor.
このような木材チップを特許文献１に開示のコンクリートなどの構成材料として使用すると、当該木材チップの吸水作用や水の放出作用、さらにはその保水量も種々の要因から不明であることも相俟って、必要強度やワーカビリティを考慮して設定された、ペーストを構成するセメント等の硬化性材料を含む粉体と水との水粉体比と、ペーストの混合物全体に占める割合とに基づいて設定した水量を添加しても、ペーストを構成する実際の水量は設定水量とはならず変化してしまい、チップ系混合物を一定の品質で安定的に製造することができないという課題があった。 When such a wood chip is used as a constituent material such as concrete disclosed in Patent Document 1, it is also possible that the water absorption action and water release action of the wood chip and the water retention amount are unknown due to various factors. Therefore, based on the water-to-powder ratio of the powder and curable material such as cement that constitutes the paste, and the ratio of the paste mixture to the total, set in consideration of the required strength and workability Even if the set amount of water is added, the actual amount of water constituting the paste is not changed to the set amount of water, and there is a problem that the chip-based mixture cannot be stably produced with a certain quality. .
本発明は上記従来の課題に鑑みて創案されたものであって、混練材料として木材チップを使用する場合に、水の配合割合を適切に設定してチップ系混合物を製造することが可能なチップ系混合物の製造方法を提供することを目的とする。 The present invention was devised in view of the above-described conventional problems, and in the case of using wood chips as a kneading material, chips capable of producing a chip-based mixture by appropriately setting the mixing ratio of water It aims at providing the manufacturing method of a system mixture.
本発明にかかるチップ系混合物の製造方法は、少なくとも水、硬化性材料および木材チップからなるチップ系混合物の製造方法であって、混練する前の使用木材チップを乾燥処理して乾燥処理前後の重量変化の比を実含水比として求める一方、混練操作中に木材チップが保持し得る保水量を推定する目的で、木材チップに混練装置の撹拌作用によって加わる圧力を付与した状態で飽和したときの当該木材チップ重量と、その後、上記使用木材チップと同一条件で乾燥処理したときの当該木材チップ重量との重量変化の比を基準含水比として求め、これら基準含水比と実含水比の差に応じた水の配合割合に設定して上記使用木材チップでチップ系混合物を製造することを特徴とする。 Method of manufacturing a chip-based mixture according to the invention, at least water, the curable material and a method of manufacturing a chip-based mixture comprising wood chips, the weight before and after drying to drying using wood chips prior to kneading While determining the ratio of change as the actual water content ratio, this is the case when the wood chip is saturated with the pressure applied by the stirring action of the kneading device for the purpose of estimating the amount of water retained by the wood chip during the kneading operation. The ratio of the weight change between the weight of the wood chip and the weight of the wood chip when the wood chip is dried under the same conditions as the above-mentioned used wood chip is obtained as a reference moisture content, and the difference between the reference moisture content and the actual moisture content is determined . It is characterized by producing a chip-based mixture with the above-mentioned wood chips used at a blending ratio of water .
該基準含水比から該実含水比を差し引いたときに、値が正の場合は、実際に混練操作される木材チップが吸水する水の割合として見込み、他方、値が負の場合は、木材チップから放出される水の割合として見込むことを特徴とする。 When the actual water content is subtracted from the reference water content, if the value is positive, the wood chip that is actually kneaded is expected as the proportion of water absorbed, while if the value is negative, the wood chip It is characterized by being estimated as the ratio of water released from the water.
本発明にかかるチップ系混合物の製造方法にあっては、混練材料として木材チップを使用する場合に、水の配合割合を適切に設定することができ、チップ系混合物を一定の品質で安定的に製造することができる。 In the method for producing a chip mixture according to the present invention, when wood chips are used as a kneading material, the mixing ratio of water can be set appropriately, and the chip mixture can be stably produced with a certain quality. Can be manufactured.
以下に、本発明にかかるチップ系混合物の製造方法の好適な一実施形態を、添付図面を参照して詳細に説明する。本実施形態にかかるチップ系混合物の製造方法は基本的には、少なくとも水、硬化性材料および木材チップからなるチップ系混合物の製造方法であって、混練する前の使用木材チップを乾燥処理して乾燥処理前後の重量変化の比を実含水比として求める一方、混練操作中に木材チップが保持し得る保水量を推定する目的で、木材チップに混練装置の撹拌作用によって加わる圧力を付与した状態で飽和したときの当該木材チップ重量と、その後、上記使用木材チップと同一条件で乾燥処理したときの当該木材チップ重量との重量変化の比を基準含水比として求め、これら基準含水比と実含水比の差に応じた水の配合割合に設定して上記使用木材チップでチップ系混合物を製造するようになっている。 Hereinafter, a preferred embodiment of a method for producing a chip-based mixture according to the present invention will be described in detail with reference to the accompanying drawings. Method of manufacturing a chip-based mixture according to the present embodiment is basically a method of making at least water, a chip-based mixture comprising a curable material, and wood chips, the use wood chips prior to kneading dried to While calculating the ratio of weight change before and after the drying treatment as the actual water content ratio, in order to estimate the amount of water that the wood chip can hold during the kneading operation, with the pressure applied to the wood chip by the stirring action of the kneading device The ratio of the weight change between the wood chip weight when saturated and the wood chip weight when dried under the same conditions as the above-mentioned used wood chips is determined as a reference moisture content, and these reference moisture content and actual moisture content are determined. The mixing ratio of water according to the difference is set to produce a chip-based mixture with the wood chips used .
基準含水量Ｗ0とは、乾燥状態の木材チップに大気圧より高い一定圧力を付与した状態で飽和したときの水の重量増加分とする。基準含水量Ｗ0を保水した木材チップおよび実際に混練操作される木材チップに対し同一条件で乾燥処理を行い、これら木材チップ各々の乾燥処理前の重量と乾燥処理後の重量の比をそれぞれ基準含水比Ｘ0および実含水比Ｘとし、基準含水比Ｘ0から実含水比Ｘを差し引いたときに、値が正の場合は、実際に混練操作される木材チップが吸水する水の割合として見込み、他方、値が負の場合は、木材チップから放出される水の割合として見込むようにする。 The reference water content W 0 is the weight increase of water when saturated in a state where a constant pressure higher than the atmospheric pressure is applied to the dry wood chip. The wood chips that retain the reference water content W 0 and the wood chips that are actually kneaded are dried under the same conditions, and the ratio of the weight of each of these wood chips before and after the drying treatment is used as a standard. When the water content ratio X 0 and the actual water content ratio X are subtracted from the reference water content ratio X 0 , if the value is positive, it is estimated that the wood chips actually kneaded will absorb water On the other hand, if the value is negative, the percentage of water released from the wood chip is estimated.
上述したように、原木の種類や材令、生木であるか枯れ木であるかの相違、そしてまた、どの程度腐食しているのかなどの原木の状態や、チップ化後から使用されるまでの状況、具体的にはすぐに使用されるのか相当期間放置されるのか、また保管が屋外なのか屋内なのか等の状態によって、木材チップは様々な保水状態にあって、吸水する傾向を示したり、水を放出する傾向を示したりする。そこで、混練操作中に木材チップが保持し得る保水量を推定する目的で、種々異なる木材チップ個々の混練時における保水能力の基準推定値を、基準含水比Ｘ0（基準含水量Ｗ0）として定量的に求め、他方で、実際に使用されて混練操作される木材チップ（以下、「使用木材チップ」という）の混練前の実含水比Ｘを求めて、これら基準含水比Ｘ0と実含水比Ｘとを比較し、これにより、使用木材チップが吸水する傾向にあるのか、あるいは水を放出しやすい傾向にあるのかを決定する方法について、図１に従って説明する。 As mentioned above, the type of raw wood, its age, the difference between raw and dead wood, and the degree of corrosion, such as how much it is corroded, and until it is used after chipping Depending on the situation, specifically whether it is used immediately or left for a considerable period of time, and whether it is stored outdoors or indoors, the wood chips are in various water retention states and tend to absorb water Or show a tendency to release water. Therefore, for the purpose of estimating the water retention amount that can be retained by the wood chips during the kneading operation, the standard estimated value of the water retention capacity at the time of kneading each of the various wood chips is used as the standard water content ratio X 0 (reference water content W 0 ). On the other hand, the actual moisture content X before kneading of wood chips that are actually used and kneaded (hereinafter referred to as “used wood chips”) is obtained, and these reference moisture content X 0 and actual moisture content are obtained. A method of comparing the ratio X and determining whether the used wood chip tends to absorb water or tends to release water will be described with reference to FIG.
まず、一定量の木材チップをサンプリングし、一定条件で乾燥処理する。乾燥処理には例えば、家庭用電子レンジなどを使用することができ、サンプリングした木材チップを広口容器などに入れて加熱する。一挙に長時間加熱乾燥させると、木材チップが発火するおそれがあるので、適宜な時間、例えば２〜３分加熱する毎に取り出して撹拌する操作を繰り返すことが好ましい。総加熱時間は、１０〜１５分程度が望ましい。 First, a certain amount of wood chips are sampled and dried under certain conditions. For example, a household microwave oven can be used for the drying process, and the sampled wood chips are placed in a wide-mouthed container and heated. If the wood chips are heated and dried all at once, the wood chips may ignite. Therefore, it is preferable to repeat the operation of taking out and stirring each time heating is performed for an appropriate time, for example, 2 to 3 minutes. The total heating time is desirably about 10 to 15 minutes.
その後、サンプリングした木材チップの現実の保水状態として、すなわち使用木材チップの保水状態として、実含水比Ｘを求める。具体的に説明すると、水の比重は１ｇ／ｃｍ3であるから、乾燥処理前後の重量変化が使用木材チップの含水量Ｗに係わると推定される。すなわち、乾燥処理前後での重量変化の比（（乾燥処理前重量−乾燥処理後重量）／乾燥処理後重量）をもって、これを実含水比Ｘとする。また、上記乾燥処理で使用木材チップはほぼ完全な乾燥状態とされるので、重量変化分を含水量Ｗと推定することができる。 Thereafter, the actual water content ratio X is obtained as the actual water retention state of the sampled wood chips, that is, as the water retention state of the used wood chips. Specifically, since the specific gravity of water is 1 g / cm 3, it is estimated that the weight change before and after the drying treatment is related to the water content W of the wood chips used. That is, the ratio of the weight change before and after the drying treatment ((weight before drying treatment−weight after drying treatment) / weight after drying treatment) is defined as the actual water content ratio X. Further, since the wood chips used in the drying process are almost completely dried, the weight change can be estimated as the water content W.
次いで、基準含水比Ｘ0を求めるために、乾燥処理した後の木材チップに一定量の水を加え、十分に馴染ませる。次いで、水を馴染ませた木材チップに対し、一定の圧力を作用させる。一定の圧力としては、ミキサなど混練装置の撹拌作用によって木材チップに加わる圧力を想定して設定する。圧力のかけ方としては、容器内の木材チップをプレス板で押圧したり、あるいは手で木材チップを握り締めるなどの方法がある。木材チップに水を馴染ませる操作と一定圧力を加える操作とを、木材チップから余剰水が滲み出てくるまで繰り返す。 Next, in order to obtain the reference water content ratio X 0 , a certain amount of water is added to the wood chips after the drying treatment, and the wood chips are sufficiently adapted. Next, a certain pressure is applied to the wood chips that have been soaked with water. The constant pressure is set assuming the pressure applied to the wood chips by the stirring action of a kneading apparatus such as a mixer. As a method of applying pressure, there are methods such as pressing a wood chip in a container with a press plate, or holding and holding the wood chip by hand. The operation of making the wood chips soaked with water and the operation of applying a constant pressure are repeated until excess water exudes from the wood chips.
余剰水が滲み出てきたときの木材チップの重量（完全湿潤重量）を測定し、その後、木材チップを先の乾燥処理と同一条件で再乾燥させた木材チップの重量（再乾燥処理後重量）を測定する。この乾燥状態から飽和した余剰水の水の重量増加分を基準含水量Ｗ0とする。そして、実含水比Ｘを求めた場合と同様に、再乾燥処理前後での重量変化の比（（完全湿潤重量−再乾燥処理後重量）／再乾燥処理後重量）をもって、これを基準含水比Ｘ0とする。 The weight of wood chips when excess water oozes out (completely wet weight), and then the weight of wood chips that were re-dried under the same conditions as the previous drying treatment (weight after re-drying treatment) Measure. The increase in the weight of excess water saturated from this dry state is defined as the reference water content W 0 . Then, as in the case of obtaining the actual water content ratio X, the ratio of the weight change before and after the re-drying treatment ((completely wet weight−weight after the re-drying treatment) / weight after the re-drying treatment) is used as the reference water content ratio. Let X0 .
そして、これら基準含水比Ｘ0と実含水比Ｘとを差し引きして比較し、その差（Ｘ0−Ｘ）が正の値ならば、その値を使用木材チップが吸水する水の割合として見込み、負の値ならば、その値を使用木材チップから放出される水の割合として見込んで、水の配合割合に反映させる。 Then, the reference water content ratio X 0 and the actual water content ratio X are subtracted and compared, and if the difference (X 0 −X) is a positive value, the value is expected as the ratio of water absorbed by the used wood chip. If the value is negative, the value is estimated as the ratio of water released from the used wood chips and reflected in the mixing ratio of water.
基準含水比Ｘ0については、上述した各種様々に異なる木材チップそれぞれについて、予め求めておくようにする。他方、実含水比Ｘについては、上記したような、基準含水比Ｘ0を求める一連の作業の中で求める場合に限られず、各使用木材チップそれぞれについて、実際に使用する際に求めるようにすればよい。これら基準含水比Ｘ0および実含水比Ｘを求める際の乾燥条件は、常に同一にするようにする。ただし、その乾燥条件は必ずしも絶乾状態にするまでの条件とする必要はない。木材チップの各種原木について、基準含水比Ｘ0を求めた結果が表１に示されている。 The reference water content ratio X 0 is determined in advance for each of the various different wood chips described above. On the other hand, the actual water content ratio X is not limited to the case where it is obtained in a series of operations for obtaining the reference water content ratio X 0 as described above. That's fine. The drying conditions for obtaining the reference water content ratio X 0 and the actual water content ratio X are always the same. However, the drying condition does not necessarily need to be the condition until the dry condition is achieved. Table 1 shows the results of determining the reference water content ratio X 0 for various raw wood chips.
上記のようにして求めた基準含水比Ｘ0および実含水比Ｘに基づいて、添加する水量の配合を補正する。この際、木材チップの内部からすべての水が放出されたり、完全湿潤状態になることはない等の木材チップの実情を考慮して、すなわち基準含水比Ｘ0と実含水比Ｘとを差し引きした上記水の割合すべてが使用木材チップの吸水や水の放出に関与することはないことを考え合わせて、移動水率αを導入する。 Based on the reference water content ratio X 0 and the actual water content ratio X obtained as described above, the composition of the amount of water to be added is corrected. At this time, considering the actual situation of the wood chip such that all the water is not released from the inside of the wood chip or it is not completely wetted, that is, the reference water content ratio X 0 and the actual water content ratio X are subtracted. In consideration of the fact that all the above water ratios are not involved in the water absorption of the used wood chips and the release of water, the moving water rate α is introduced.
この移動水率αの考え方のイメージが図２に示されている。使用木材チップを混入した混練材料は、縦軸方向の「チップ系混合物の容積」の表記で理解されるように、セメント等の硬化性材料を含む粉体と水からなるペーストと、完全乾燥状態の木材チップと、木材チップ内の水（含水量Ｗ）として把握できる。そして木材チップは、横軸方向の「木材チップの含水量」の表記で理解されるように、ペーストからの水の出入りがない、上記基準含水量Ｗ0を境として、ペーストからの吸水作用が生じ得る含水量から、ペーストへ水を放出し得る含水量まで、様々な含水状態にある。そして、移動水率αは木材チップの上記実情を考慮して、基準含水量Ｗ0から木材チップ内の含水量Ｗを差し引いた分に対し、適宜な係数として乗じられ、これにより、使用木材チップの実情を反映した補正が配合表においてなされる。補正を行った配合表が、表２および表３に示されている。 An image of the concept of the moving water rate α is shown in FIG. The kneaded material mixed with the wood chips used, as understood by the notation of “volume of the chip-based mixture” in the vertical axis direction, a paste composed of a powder containing a curable material such as cement and water, and a completely dry state And the water (water content W) in the wood chip. And as understood from the notation of “water content of wood chip” in the horizontal axis direction, the wood chip does not enter and exit water from the paste, and has a water absorption action from the paste with the reference water content W 0 as a boundary. There are various moisture conditions, from the moisture content that can occur to the moisture content that can release water into the paste. The moving water rate α is multiplied as an appropriate coefficient by subtracting the water content W in the wood chip from the reference water content W 0 in consideration of the above-mentioned actual situation of the wood chip. Corrections reflecting the actual situation are made in the recipe. The corrected recipes are shown in Table 2 and Table 3.
表２には、補正前の配合と、補正後の配合とが併記した形で示され、表３には、補正後の配合表が示されている。表２で注目されることは、補正前および補正後それぞれの（木材チップ水分のみ重量／木材チップのみ重量）値である実含水比Ｘが４５％および基準含水比Ｘ0が９０％であって、これより使用木材チップの吸水作用が見込まれ、補正前の木材チップ重量が２５０ｋｇ／ｍ3で、木材チップ水分のみ重量が７８ｋｇ／ｍ3であることに対して、補正後では、基準含水量Ｗ0が１５５ｋｇ／ｍ3であることにより、吸水作用を考慮して木材チップ重量が（２５０＋７７）ｋｇ／ｍ3と補正されている。これにより、ペースト水は補正前の１９６ｋｇ／ｍ3から、水粉体比（Ｗ／Ｐ）を考慮して（１８８＋７７×α）ｋｇ／ｍ3に補正されている。（７７×α）ｋｇ／ｍ3が使用木材チップに吸水されると推定される水量である。 Table 2 shows the composition before correction and the composition after correction, and Table 3 shows the composition table after correction. What is noticed in Table 2 is that the actual water content ratio X is 45% and the reference water content ratio X 0 is 90% before and after the correction (weight of wood chip moisture / weight of wood chip only). From this, the water absorption effect of the used wood chips is expected, the weight of the wood chips before correction is 250 kg / m 3 , and the weight of only the wood chip moisture is 78 kg / m 3 , whereas the reference moisture content after correction is Since W 0 is 155 kg / m 3 , the wood chip weight is corrected to (250 + 77) kg / m 3 in consideration of water absorption. Thus, the paste water is corrected from 196 kg / m 3 before correction to (188 + 77 × α) kg / m 3 in consideration of the water powder ratio (W / P). (77 × α) kg / m 3 is the amount of water estimated to be absorbed by the used wood chips.
移動水率αは表３に示すように、０．９と設定されている。そしてこのような水の配合割合の変更に従って、単位水量等が補正されている。なお、この配合表では、木材チップの原木として流木が用いられ、また混練材料の粉体分として、微粉炭燃焼方式の火力発電所等で生成された石炭灰を用いる例が示されている。 As shown in Table 3, the moving water rate α is set to 0.9. And the unit water quantity etc. are correct | amended according to such a change of the mixture ratio of water. In this blending table, an example is shown in which driftwood is used as the raw wood for wood chips, and coal ash generated in a pulverized coal combustion type thermal power plant or the like is used as the powder component of the kneaded material.
図３には、水の配合割合を調整した使用木材チップ実含水比Ｘとチップ系混合物の４週強度との関係が、ペースト容積比０．４，水粉体比（Ｗ／Ｐ）４５％、石炭灰置換率５０％である場合を例にとって示されている。含水量が多いと、やや強度が低下する傾向があるが、おおよそ同一の強度が得られている。従って、施工時に使用木材チップの含水量Ｗを計測し、基準含水量Ｗ0と計測した含水量Ｗとの水量差を、混練時の水量に反映することで、安定した品質の混合物を製造することができると言える。 FIG. 3 shows the relationship between the actual moisture content X of the used wood chips adjusted for the mixing ratio of water and the 4-week strength of the chip-based mixture. The paste volume ratio is 0.4 and the water powder ratio (W / P) is 45%. The case where the coal ash substitution rate is 50% is shown as an example. If the water content is high, the strength tends to decrease slightly, but the same strength is obtained. Therefore, by measuring the water content W of the wood chips used at the time of construction and reflecting the water content difference between the reference water content W 0 and the measured water content W in the water content at the time of kneading, a stable quality mixture is produced. I can say that.
図４には、比較例として、使用木材チップの含水量を水の配合割合に反映しなかった場合の使用木材チップ実含水比Ｘとチップ系混合物の４週強度との関係が示されている。含水量の大きい使用木材チップでは強度が増加しており、含水比４５％の標準状態のときと、含水比１４０％の水浸状態のときとを比較すると、６〜７倍の強度の差が生じている。これはチップ系混合物の製造時に、標準状態ではペースト中の水が使用木材チップに吸水されるのに対し、水浸状態ではペーストへ使用木材チップから水が放出されて、実質的なペースト容積が顕著に増えていることによる。ペーストの水粉体比（Ｗ／Ｐ）が大きくなる分、ペースト自体の強度が低下するのに対し、容積比の大きくなる効果が顕著であることを示している。また、目視したところ、材料分離の発生が見受けられた。このように、使用木材チップの含水量を水の配合割合に反映させない場合には、安定した品質を確保することはできない。 FIG. 4 shows, as a comparative example, the relationship between the actual moisture content X of used wood chips and the 4-week strength of the chip-based mixture when the water content of the used wood chips is not reflected in the mixing ratio of water. . Use wood chips with high water content have increased strength, and there is a 6-7 times difference in strength when compared with the standard condition with a moisture content of 45% and the soaked condition with a moisture content of 140%. Has occurred. This is because during the production of a chip-based mixture, the water in the paste is absorbed by the used wood chips in the standard state, whereas in the water immersion state, water is released from the used wood chips into the paste, resulting in a substantial paste volume. This is due to the remarkable increase. As the water powder ratio (W / P) of the paste increases, the strength of the paste itself decreases, whereas the effect of increasing the volume ratio is remarkable. Further, when visually observed, occurrence of material separation was observed. Thus, stable quality cannot be ensured if the water content of the used wood chips is not reflected in the mixing ratio of water.
以上のように、本実施形態にかかるチップ系混合物の製造方法にあっては、混練する前の使用木材チップを乾燥処理して乾燥処理前後の重量変化の比を実含水比として求める一方、混練操作中に木材チップが保持し得る保水量を推定する目的で、木材チップに混練装置の撹拌作用によって加わる圧力を付与した状態で飽和したときの当該木材チップ重量と、その後、上記使用木材チップと同一条件で乾燥処理したときの当該木材チップ重量との重量変化の比を基準含水比として求め、これら基準含水比と実含水比の差に応じた水の配合割合に設定して上記使用木材チップでチップ系混合物を製造するようにしたので、使用木材チップの実含水比Ｘが変化しても、チップ系混合物を一定の品質で安定的に製造することができる。また、予め基準含水比Ｘ0を求めておくことにより、使用木材チップの実含水比Ｘが変化しても、配合の補正を簡易かつ適切に行うことができる。 As described above, in the manufacturing method of the chip-based mixture according to the present embodiment, the wood chips used before kneading are dried and the ratio of weight change before and after the drying is obtained as the actual water content ratio. For the purpose of estimating the amount of water that the wood chip can hold during operation, the wood chip weight when saturated with the pressure applied to the wood chip by the stirring action of the kneading device, and then the wood chip used The ratio of the change in weight with the weight of the wood chip when dried under the same conditions is obtained as the reference water content ratio, and the above-mentioned wood chip used is set to the blending ratio of water according to the difference between the reference water content ratio and the actual water content ratio. in since so as to produce a chip-based mixture, even the actual water content ratio X of using wood chips is changed, it is possible to stably manufacture a chip-based mixture with a constant quality. Further, by obtaining the reference water content ratio X 0 in advance, even if the actual water content ratio X of the used wood chips changes, the composition can be corrected easily and appropriately.
Ｗ0 基準含水量
Ｗ 含水量
Ｘ0 基準含水比
Ｘ 実含水比
W 0 standard water content W water content X 0 standard water content ratio X actual water content ratio
Claims (2)
混練する前の使用木材チップを乾燥処理して乾燥処理前後の重量変化の比を実含水比として求める一方、
混練操作中に木材チップが保持し得る保水量を推定する目的で、木材チップに混練装置の撹拌作用によって加わる圧力を付与した状態で飽和したときの当該木材チップ重量と、その後、上記使用木材チップと同一条件で乾燥処理したときの当該木材チップ重量との重量変化の比を基準含水比として求め、
これら基準含水比と実含水比の差に応じた水の配合割合に設定して上記使用木材チップでチップ系混合物を製造することを特徴とするチップ系混合物の製造方法。 A method for producing a chip-based mixture comprising at least water, a curable material and wood chips,
While the wood chips used before kneading are dried and the ratio of weight change before and after the drying treatment is determined as the actual water content ratio,
For the purpose of estimating the amount of water that the wood chip can hold during the kneading operation, the wood chip weight when saturated with the pressure applied to the wood chip by the stirring action of the kneading device, and then the wood chip used above The ratio of the change in weight with the weight of the wood chip when dried under the same conditions as the reference water content ratio,
A method for producing a chip-based mixture , characterized in that a chip-based mixture is produced from the above-mentioned wood chips used by setting the mixing ratio of water according to the difference between the reference water content ratio and the actual water content ratio.
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| JP2982568B2 (en) * | 1993-07-20 | 1999-11-22 | 株式会社大林組 | Concrete and concrete vegetation method |
| JP2002047609A (en) * | 2000-08-01 | 2002-02-15 | Sato Road Co Ltd | Wooden material pavement |
| JP2002241163A (en) * | 2001-02-09 | 2002-08-28 | Koa Funenban Kogyo Kk | Method for constructing mortar or concrete structure |
| JP2004091216A (en) * | 2002-08-29 | 2004-03-25 | Ohbayashi Corp | Wooden concrete-based structure, production method therefor and wooden concrete-based pavement |
| JP2005120774A (en) * | 2003-10-20 | 2005-05-12 | Sato Road Co Ltd | Moisture content adjusting method of wood chip and moisture content management method |
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| JP2982568B2 (en) * | 1993-07-20 | 1999-11-22 | 株式会社大林組 | Concrete and concrete vegetation method |
| JP2002047609A (en) * | 2000-08-01 | 2002-02-15 | Sato Road Co Ltd | Wooden material pavement |
| JP2002241163A (en) * | 2001-02-09 | 2002-08-28 | Koa Funenban Kogyo Kk | Method for constructing mortar or concrete structure |
| JP2004091216A (en) * | 2002-08-29 | 2004-03-25 | Ohbayashi Corp | Wooden concrete-based structure, production method therefor and wooden concrete-based pavement |
| JP2005120774A (en) * | 2003-10-20 | 2005-05-12 | Sato Road Co Ltd | Moisture content adjusting method of wood chip and moisture content management method |
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