JP2004020512A - Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method - Google Patents

Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method Download PDF

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JP2004020512A
JP2004020512A JP2002179480A JP2002179480A JP2004020512A JP 2004020512 A JP2004020512 A JP 2004020512A JP 2002179480 A JP2002179480 A JP 2002179480A JP 2002179480 A JP2002179480 A JP 2002179480A JP 2004020512 A JP2004020512 A JP 2004020512A
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Prior art keywords
lock material
water absorption
water
specific gravity
lock
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JP2002179480A
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Japanese (ja)
Inventor
Satoru Nagase
長瀬 覚
Shozo Wada
和田 章三
Hiroshi Kuroki
黒木 博
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Taisei Corp
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Taisei Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for speedily measuring the specific gravity and water absorption of rock materials in situ, and to provide a rock material water absorption method to be used for the measurement, and a rock material drying method. <P>SOLUTION: In the rock material water absorption method, the rock materials are housed in a sealed container filled with deaerated water, and the sealed container is evacuated. In the rock material drying method, the rock materials are housed in the sealed container, and the sealed container is evacuated. The method for measuring the specific gravity and water absorption of the rock materials includes both a process for housing the rock materials in the sealed container filled with the deaerated water and evacuating the sealed container and a drying process for housing the rock materials in the sealed container and evacuating the sealed container. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、ロック材の比重及び吸水率の測定方法、ロック材の吸水方法及び乾燥方法に関するものである。
【0002】
【従来の技術】
ロックフィルダムのロック材の材料強度を判定する指標の一つとして、ロック材の比重及び吸水率が採用されることが多い。比重及び吸水率の測定はJISA1110(以下、JIS法と言う)に規定されている。
【0003】
JIS法は、図3に示したようなフローで行われる。まず、S101においてロック材を20±5℃の水中に浸漬し、24時間以上吸水させる(以下、この工程を「吸水工程」と称する)。そして、水中におけるロック材の見かけの質量m2を測定する(S102)、続いて、ロック材を取り出し、吸水性のある布で表面に付着した水分を拭い、表面乾燥飽水状態のロック材の質量m1を測定する(S103)。
【0004】
続いて、S104において、表面乾燥飽水状態のロック材中に吸水された水分を蒸発させるために105±5℃の条件下でロック材が一定質量となるまで乾燥させる(以下、この工程を「乾燥工程」と称する)。通常、乾燥工程では24時間以上の時間が必要となる。そして、ロック材を室温となるまで冷却し、絶対乾燥状態におけるロック材の質量m4を測定する(S105)。
【0005】
続いて、次に示す式に従い、表面乾燥飽水状態におけるロック材の比重Ds、絶対乾燥状態におけるロック材の比重Dd、吸水率Qを算出する(S106)。

Figure 2004020512
ここで、ρwは水の密度である。
【0006】
このようにして得られた表面乾燥飽水状態におけるロック材の比重Ds、絶対乾燥状態におけるロック材の比重Dd及び吸水率Qとから、そのロック材の材料強度を判定し、ロックフィルダムへの使用の適否を判断する。
【0007】
【発明が解決しようとする課題】
ところで、JIS法では、ロック材を採取してから結果を得るまでに2〜3日程度の時間が必要となる。このため、現場において、JIS法による材料判定と建設工事とを並行して行おうとすると、材料判定が律速となってしまい、建設工事が円滑に進まないという問題が発生する。
【0008】
JIS法による材料判定に長時間を要するのは、ロック材の吸水工程及び乾燥工程にそれぞれ24時間以上の時間がかかるためであり、これらの2工程に要する時間を短縮することができれば、材料判定に要する時間を短縮することが可能となる。
【0009】
この問題点を解決するために、本発明者らは、ロック材の吸水工程において、ロック材を煮沸した後に水中に浸漬する方法(以下、煮沸法と言う)を採用することで、吸水に要する時間をJIS法に比べて短縮できることを確認した。また、本発明者らは、ロック材の乾燥工程において、電子レンジを用いてロック材を乾燥させる方法(以下、電子レンジ法と言う)を採用することで、乾燥に要する時間をJIS法に比べて短縮できることを確認した。
以下、吸水工程において煮沸法を用い、乾燥工程において電子レンジ法を用いてロック材の比重及び吸水率を測定する方法を「従来の方法」と称することとする。
【0010】
しかし、煮沸法では、(1)煮沸中にロック材が割れることがある、(2)煮沸直後のロック材が高温となっておりハンドリング性が悪い、等の新たな問題が発生した。
また、電子レンジ法では、(1)ロック材が局所的に過熱されてしまい、ロック材が変質してしまう、(2)ロック材自体が燃えてしまい、ロック材の質量が軽くなるため、試験誤差が大きくなる、(3)ロック材が高温になりハンドリング性が悪い、等の新たな問題が発生した。
【0011】
本発明は、このような問題点に鑑みなされたものであり、現場において、迅速に実施でき且つ信頼性の高い測定結果を得ることができるロック材の比重及び吸水率の測定方法、この測定において用いられるロック材の吸水方法及びロック材の乾燥方法を提供することを課題とする。
【0012】
【課題を解決するための手段】
本発明は、前記した課題を解決するために次のように構成した。
請求項1に記載の発明は、脱気水を満たした密閉容器中にロック材を収納し、前記密閉容器を減圧することを特徴とするロック材の吸水方法である。
請求項1に記載の発明によれば、脱気水を満たした密閉容器中にロック材を収納した上で、この密閉容器を減圧することにより、ロック材中に存在する微細な割れ目や間隙から大気が放出され脱気水と置換される。つまり、ロック材が吸水する。これにより、JIS法の吸水工程や煮沸法に比べて迅速に、ロック材の吸水を完了することができる。
また、ロック材を煮沸しないので、ロック材が割れてしまうといった不具合が発生しない。
尚、ここで、脱気水とは、煮沸や減圧等により予め水中に存在する気体成分を取り除いた水のことを言う。
【0013】
請求項2に記載の発明は、密閉容器中にロック材を収納し、前記密閉容器を減圧することを特徴とするロック材の乾燥方法である。
請求項2に記載の発明によれば、ロック材を密閉容器に収納し、この密閉容器を減圧することで、ロック材中に存在する水分を蒸発させ、ロック材を乾燥することができる。これにより、JIS法の乾燥工程や電子レンジ法に比べて迅速に、ロック材の乾燥を完了することができる。
また、ロック材を加熱しないので、ロック材が変質したり燃えてしまったりすることを防ぐことができる。
【0014】
請求項3に記載の発明は、脱気水を満たした密閉容器中にロック材を収納し、前記密閉容器を減圧する吸水工程と、密閉容器中にロック材を収納し、前記密閉容器を減圧する乾燥工程と、を有することを特徴とするロック材の比重及び吸水率の測定方法である。
【0015】
請求項3に記載の発明によれば、ロック材の比重及び吸水率の測定で、吸水工程においてロック材が脱気水とともに収納された密閉容器を減圧することで、ロック材に吸水を行わせる。さらに、乾燥工程において、ロック材が収納された密閉容器を減圧することで、ロック材に含浸した水分を蒸発させる。
これにより、ロック材の比重及び吸水率をJIS法や従来の方法よりも迅速に求めることができる。また、本発明の方法では、ロック材を室温環境で処理できるので、ロック材が割れたり、燃えたり、変質したりすることがないので、従来の方法に比較して正確な比重及び吸水率を算出することができる。
【0016】
【発明の実施の形態】
以下、本発明の実施の形態を適宜図面を参照して説明する。
【0017】
(A)吸水方法
本発明のロック材の吸水方法は、図1に示したような容器を用いて行われる。
この容器は、ガラスやアクリル樹脂等の透明な材料からなる円筒状である筒部1と、この筒部1の上端開口を塞ぐように設置された蓋2と、この筒部1の下端開口を塞ぐように設置された底3とを含んで構成されている。
【0018】
筒部1と蓋2及び筒部1と底3との接触部には、パッキン等(不図示)が介挿されており、容器内部が減圧されたときに、外部から大気がリークしないように構成されている。また、蓋2と底3とは筒部1を挟んで固定できるようにボルト4,4等により接続されている。
【0019】
また、底3には、容器内部に脱気水を導入するための導入管5が設けられており、容器内部にロック材が収納された後に、この導入管5から容器内部に脱気水が満たされる。尚、この導入管には、バルブ5aが設けられており、容器を減圧する際には、このバルブ5aは閉じられる。
【0020】
また、蓋2には、容器内部に脱気水を充填する際のエアー抜き管6及び減圧管7が設けられている。エアー抜き管6は容器内部に脱気水を充填する際に開放され、容器内部の大気を排出する。脱気水が容器内部に充填された後はバルブ6aが閉じられる。
減圧管7は、図示しない真空ポンプやアスピレータ等に接続され、脱気水が満たされた容器内部を減圧する作用を有する。
【0021】
続いて、ロック材の吸水方法のフローについて説明する。
(1)容器中にロック材を入れ、導入管5より脱気水を容器中に満たす。
(2)各バルブ5a,6aを閉じ、減圧管7に接続した真空ポンプ等を稼動して容器内部の減圧を行う。
(3)ロック材表面からの気泡の発生状況を確認しながら、減圧を続行し、気泡発生が停止したところで、ロック材が飽水状態になったと判断し、減圧を停止し、容器内部よりロック材を取出す。
【0022】
本発明の吸水方法によれば、100mmφ程度の輝緑凝灰岩、粘板岩等を主成分とするロック材を飽水状態とするのに要した時間は僅か数分程度であり、JIS法、煮沸法に比較して非常に迅速にロック材の吸水を行うことができた。
【0023】
また、JIS法で採用されている吸水方法(24時間水中浸漬)と本発明の吸水方法とで同一のロック材について、吸水終了後のロック材の表面乾燥飽水状態における質量の比較を行ったが、両者は誤差の範囲で一致した。
【0024】
本発明の吸水方法を実施する際の減圧度は、ロック材内部の気泡を素早く放出させ、水に置換できるような減圧度であれば特に制限はない。
【0025】
また、減圧により吸水を行う時間は、ロック材の大きさや材質により異なり、一概に好適な範囲を限定することは難しいが、100mmφ程度のロック材であれば、長くとも10〜20分程度の吸水を行うことで、ロック材から気泡の発生が止まり、ロック材は飽水状態となる。
【0026】
(B)乾燥方法
本発明のロック材の乾燥方法は、前記した図1の容器を用いて行われる。この容器については説明を省略する。
【0027】
ロック材の乾燥方法のフローについて説明する。
(1)拭き取り等を行い、水分を除去した容器内にロック材を収納する。
(2)各バルブ5a,6aを閉じ、減圧管7に接続した真空ポンプ等を稼動して容器内の減圧を行う。
(3)ロック材の表面状態(濡れ具合)を確認しながら、減圧を続行し、ロック材の表面が乾燥したところで、減圧を停止し、容器内部よりロック材を取出す。
【0028】
本発明の乾燥方法によれば、表面乾燥飽水状態にある100mmφ程度の
輝緑凝灰岩、粘板岩等を主成分とするロック材を絶対乾燥状態とするのに要した時間は、僅か数分程度であり、JIS法、電子レンジ法に比較して非常に迅速にロック材の乾燥を行うことができた。
また、ロック材を加熱するJIS法と異なり、室温付近で乾燥を行うので、ロック材のハンドリング性が向上した。また、ロック材が燃えたり局所的に過熱されたりすることがないので、電子レンジ法に比較して正確な絶対乾燥状態におけるロック材の質量を得ることができる。
【0029】
また、JIS法で採用されている乾燥方法(105±5℃で24時間以上)と本発明の乾燥方法とで、同一のロック材について、乾燥を行い、絶対乾燥状態におけるロック材の質量の比較を行ったが、両者は誤差の範囲で一致した。
【0030】
本発明の乾燥方法を実施する際の減圧度は、ロック材内部の水分を素早く蒸発できるような減圧度であれば特に制限はない。
【0031】
また、減圧により乾燥を行う時間は、ロック材の大きさや材質により異なり、一概に好適な範囲を限定することは難しいが、ロック材の表面が目視により完全に乾燥した状態となるまで乾燥を行うことが望ましい。
【0032】
(C)比重及び吸水率の測定方法
本発明の比重及び吸水率の測定方法は、前記した吸水方法((A)欄)及び乾燥方法((B)欄)を応用して行われるものである。
本発明の比重及び吸水率の測定方法のフローについて図2を参照して説明する。
【0033】
まず、前記(A)欄に記載したようにして吸水工程を行う。すなわち、ロック材を容器中に収納して容器を脱気水で満たし、容器を減圧することで、ロック材を飽水状態とし(S10)、この状態で、水中におけるロック材の見かけの質量m2を測定する(S11)。続いて、ロック材を取り出し、吸水性のある布で表面に付着した水分を拭い、表面乾燥飽水状態のロック材の質量m1を測定する(S12)。
【0034】
続いて、前記(B)欄に記載したようにして乾燥工程を行う。すなわち、表面乾燥飽水状態のロック材を乾燥させるために、水分を除いた容器中に、ロック材を収納し、容器を減圧することでロック材を絶対乾燥状態とする(S13)。
【0035】
続いて、ロック材を取り出し、絶対乾燥状態におけるロック材の質量m4を測定する(S14)。最後に、前記した(1)〜(3)式に従い、表面乾燥飽水状態におけるロック材の比重Ds、絶対乾燥状態におけるロック材の比重Dd、吸水率Qを算出する(S15)。
【0036】
本発明の比重及び吸水率の測定方法では、100mmφ程度の輝緑凝灰岩、粘板岩等を主成分とするロック材の比重及び吸水率を算出するのに要した時間は僅か30分程度であり、JIS法及び従来の方法に比較して非常に迅速にロック材の比重及び吸水率を算出することができた。
【0037】
また、同一のロック材について、JIS法と本発明の比重及び吸水率の測定方法とで得られた吸水率及び比重を比較したが、両者は誤差の範囲で一致したことが確認された。
【0038】
以上、本発明の実施の形態を説明したが、本発明は、この実施の形態にのみ限定されるものではなく、本発明の技術的思想を具現化する種々の変更が可能である。
【0039】
【発明の効果】
本発明は次のような顕著な効果を奏する。
本発明の吸水方法は、脱気水を満たした密閉容器中にロック材を収納し、密閉容器を減圧することで、ロック材から強制的に気泡を発生させ、ロック材に吸水させるので、JIS法で用いられている吸水方法よりも非常に迅速にロック材を飽水状態とすることができる。また、強制的にロック材に吸水を行わせるので、ロック材の材質による吸水量のバラツキが少ない。さらに、常温で吸水を行わせるので、煮沸法のようにロック材が割れる恐れもない(請求項1)。
【0040】
本発明の乾燥方法は、密閉容器中にロック材を収納し、前記密閉容器を減圧することで、ロック材から強制的に水分を蒸発させるので、JIS法で用いられている乾燥方法や電子レンジ法よりも非常に迅速にロック材を絶対乾燥状態とすることができる(請求項2)。
【0041】
本発明のロック材の比重及び吸水率の測定方法によれば、JIS法や従来の方法よりも非常に迅速に、JIS法と同等の精度でロック材の比重及び吸水率を算出することができる(請求項3)。
【図面の簡単な説明】
【図1】本発明に用いられる容器の模式図である。
【図2】本発明のロック材の比重及び吸水率の測定方法のフローである。
【図3】JIS法におけるロック材の比重及び吸水率の測定方法のフローである。
【符号の説明】
1 筒部
2 蓋
3 底
4 ボルト
5 導入管
5a,6a バルブ
6 エアー抜き管
7 減圧管[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for measuring the specific gravity and water absorption of a lock material, a method for absorbing water from a lock material, and a method for drying the lock material.
[0002]
[Prior art]
As one of the indexes for determining the material strength of the lock material of the rock fill dam, the specific gravity and the water absorption of the lock material are often adopted. The measurement of specific gravity and water absorption is specified in JIS A1110 (hereinafter referred to as JIS method).
[0003]
The JIS method is performed according to the flow shown in FIG. First, in step S101, the lock material is immersed in water at 20 ± 5 ° C. to absorb water for 24 hours or more (hereinafter, this step is referred to as “water absorption step”). Then, the apparent mass m2 of the lock material in water is measured (S102). Subsequently, the lock material is taken out, the moisture attached to the surface is wiped off with a water-absorbing cloth, and the mass of the lock material in the surface dry and saturated state is obtained. m1 is measured (S103).
[0004]
Subsequently, in step S104, the lock material is dried under a condition of 105 ± 5 ° C. until the lock material has a constant mass in order to evaporate the water absorbed in the lock material in the surface dry and saturated state (hereinafter, this step is referred to as “ Drying step "). Usually, the drying step requires 24 hours or more. Then, the lock material is cooled to room temperature, and the mass m4 of the lock material in an absolutely dry state is measured (S105).
[0005]
Subsequently, the specific gravity Ds of the lock material in the surface dry and saturated state, the specific gravity Dd of the lock material in the absolute dry state, and the water absorption Q are calculated according to the following equations (S106).
Figure 2004020512
Here, ρw is the density of water.
[0006]
The material strength of the lock material is determined from the specific gravity Ds of the lock material in the surface dry and saturated state obtained in this way, the specific gravity Dd of the lock material in the absolute dry state, and the water absorption Q, and used for a rock fill dam. Judge the suitability.
[0007]
[Problems to be solved by the invention]
By the way, according to the JIS method, a time of about two to three days is required from obtaining a lock material to obtaining a result. For this reason, if the material determination based on the JIS method and the construction work are performed in parallel at the site, the material determination becomes rate-determining, causing a problem that the construction work does not proceed smoothly.
[0008]
The reason why the material determination by the JIS method takes a long time is that the water absorption step and the drying step of the lock material each take 24 hours or more, and if the time required for these two steps can be shortened, the material determination Can be shortened.
[0009]
In order to solve this problem, the inventors of the present invention adopt a method in which the lock material is boiled and then immersed in water in the water absorption step of the lock material (hereinafter, referred to as a boiling method), so that the water absorption is required. It was confirmed that the time could be reduced compared to the JIS method. In addition, the present inventors adopt a method of drying a lock material using a microwave oven (hereinafter, referred to as a microwave method) in a drying process of the lock material, so that the time required for drying is reduced as compared with the JIS method. It was confirmed that it could be shortened.
Hereinafter, the method of measuring the specific gravity and the water absorption of the lock material using the boiling method in the water absorption step and the microwave method in the drying step will be referred to as “conventional method”.
[0010]
However, the boiling method causes new problems such as (1) the lock material may be broken during boiling, and (2) the lock material immediately after boiling is at a high temperature and has poor handling properties.
In addition, in the microwave oven method, (1) the lock material is locally overheated and the lock material is deteriorated, and (2) the lock material itself burns and the mass of the lock material is reduced. New problems such as an increase in error and (3) a high temperature of the lock material and poor handling properties have occurred.
[0011]
The present invention has been made in view of such problems, and in the field, a method for measuring the specific gravity and water absorption of a lock material that can be quickly performed and can obtain a highly reliable measurement result. It is an object of the present invention to provide a method for absorbing water from a lock material and a method for drying the lock material.
[0012]
[Means for Solving the Problems]
The present invention is configured as follows in order to solve the above-mentioned problem.
The invention according to claim 1 is a method for absorbing water from a lock material, wherein the lock material is housed in a closed container filled with degassed water, and the pressure in the closed container is reduced.
According to the first aspect of the present invention, after the lock material is housed in the closed container filled with degassed water, the pressure in the closed container is reduced to remove fine cracks and gaps present in the lock material. The atmosphere is released and replaced by degassed water. That is, the lock material absorbs water. Thereby, the water absorption of the lock material can be completed more quickly than in the water absorption process or the boiling method of the JIS method.
Further, since the lock material is not boiled, there is no problem that the lock material is broken.
Here, the degassed water refers to water from which gas components existing in the water have been removed in advance by boiling, decompression, or the like.
[0013]
The invention according to claim 2 is a method for drying a lock material, wherein the lock material is stored in a closed container and the pressure in the closed container is reduced.
According to the second aspect of the present invention, the lock material is housed in a closed container, and the pressure in the closed container is reduced, whereby the water present in the lock material can be evaporated and the lock material can be dried. Thus, the drying of the lock material can be completed more quickly than in the drying process of the JIS method or the microwave method.
Further, since the lock material is not heated, it is possible to prevent the lock material from being deteriorated or burnt.
[0014]
According to a third aspect of the present invention, a lock material is housed in a closed container filled with degassed water and a water absorbing step of depressurizing the closed container, and a lock material is housed in the closed container, and the closed container is depressurized. And measuring the specific gravity and water absorption of the lock material.
[0015]
According to the third aspect of the present invention, in the measurement of the specific gravity and the water absorption of the lock material, the lock material is made to absorb water by depressurizing the closed container in which the lock material is stored together with the deaerated water in the water absorption step. . Further, in the drying step, the pressure in the closed container storing the lock material is reduced, thereby evaporating the water impregnated in the lock material.
Thereby, the specific gravity and the water absorption of the lock material can be obtained more quickly than the JIS method or the conventional method. Further, in the method of the present invention, since the lock material can be processed in a room temperature environment, the lock material does not crack, burn or deteriorate, so that the specific gravity and the water absorption rate are more accurate than those of the conventional method. Can be calculated.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.
[0017]
(A) Water Absorption Method The water absorption method of the lock material of the present invention is performed using a container as shown in FIG.
This container has a cylindrical portion 1 made of a transparent material such as glass or acrylic resin, a lid 2 installed to close the upper end opening of the cylindrical portion 1, and a lower end opening of the cylindrical portion 1. And a bottom 3 installed so as to close.
[0018]
A packing or the like (not shown) is interposed between the cylindrical portion 1 and the lid 2 and the contact portion between the cylindrical portion 1 and the bottom 3 so that when the pressure inside the container is reduced, the atmosphere does not leak from the outside. It is configured. In addition, the lid 2 and the bottom 3 are connected by bolts 4, 4 and the like so that the lid 2 and the bottom 3 can be fixed with the tubular portion 1 interposed therebetween.
[0019]
In addition, the bottom 3 is provided with an introduction pipe 5 for introducing degassed water into the inside of the container, and after the lock material is stored inside the container, the degassed water is introduced into the inside of the container from this introduction pipe 5. It is filled. The introduction pipe is provided with a valve 5a, which is closed when the pressure in the container is reduced.
[0020]
Further, the lid 2 is provided with an air vent pipe 6 and a decompression pipe 7 for filling the inside of the container with degassed water. The air vent tube 6 is opened when filling the inside of the container with deaerated water, and discharges the atmosphere inside the container. After the degassed water is filled in the container, the valve 6a is closed.
The decompression pipe 7 is connected to a vacuum pump, an aspirator, or the like (not shown), and has a function of depressurizing the inside of the container filled with deaerated water.
[0021]
Subsequently, the flow of the method of absorbing the lock material will be described.
(1) A lock material is put in a container, and the container is filled with degassed water from the introduction pipe 5.
(2) The valves 5a and 6a are closed, and a vacuum pump or the like connected to the pressure reducing pipe 7 is operated to reduce the pressure inside the container.
(3) Depressurization is continued while checking the generation of air bubbles from the surface of the lock material. When the generation of air bubbles stops, it is determined that the lock material has become saturated, the decompression is stopped, and locking is performed from inside the container. Take out the material.
[0022]
According to the water absorption method of the present invention, the time required to make the rock material mainly composed of diaphyrite tuff, slate and the like of about 100 mmφ into a saturated state is only about several minutes, and the JIS method and the boiling method are used. The water absorption of the lock material could be performed very quickly in comparison.
[0023]
Further, for the same lock material in the water absorption method (immersion in water for 24 hours) adopted in the JIS method and the water absorption method of the present invention, the mass of the lock material after the water absorption was completed in the surface dry and saturated state was performed. However, both agreed within the range of the error.
[0024]
The degree of pressure reduction when the water absorption method of the present invention is carried out is not particularly limited as long as air bubbles inside the lock material can be quickly released and replaced with water.
[0025]
In addition, the time for absorbing water by decompression varies depending on the size and material of the lock material, and it is difficult to limit a suitable range. However, if the lock material has a diameter of about 100 mm, it will take up to about 10 to 20 minutes to absorb water. Is performed, the generation of air bubbles from the lock material stops, and the lock material becomes saturated.
[0026]
(B) Drying Method The drying method of the lock material of the present invention is performed using the above-described container of FIG. The description of this container is omitted.
[0027]
The flow of the method for drying the lock material will be described.
(1) The lock material is stored in a container from which moisture has been removed by wiping or the like.
(2) Each valve 5a, 6a is closed, and a vacuum pump or the like connected to the pressure reducing pipe 7 is operated to reduce the pressure in the container.
(3) Depressurization is continued while checking the surface condition (wetness) of the lock material. When the surface of the lock material is dried, the depressurization is stopped, and the lock material is taken out of the container.
[0028]
According to the drying method of the present invention, the time required for the rock material having a surface dry and saturated state of about 100 mmφ of diorite tuff, slate and the like as a main component to be in an absolutely dry state is only about several minutes. Yes, the lock material could be dried very quickly compared to the JIS method and the microwave method.
Further, unlike the JIS method in which the lock material is heated, since the drying is performed at around room temperature, the handleability of the lock material is improved. Further, since the lock material is not burned or locally heated, the mass of the lock material in the absolute dry state can be obtained more accurately than in the microwave oven method.
[0029]
Further, the same lock material is dried by the drying method adopted in the JIS method (at 105 ± 5 ° C. for 24 hours or more) and the drying method of the present invention, and the mass of the lock material in an absolute dry state is compared. Was carried out, but they agreed within an error range.
[0030]
The degree of pressure reduction when the drying method of the present invention is performed is not particularly limited as long as the pressure inside the lock material can be quickly evaporated.
[0031]
In addition, the time for drying under reduced pressure varies depending on the size and material of the lock material, and it is difficult to limit the suitable range in general. However, the drying is performed until the surface of the lock material is completely dried visually. It is desirable.
[0032]
(C) Method for measuring specific gravity and water absorption The method for measuring specific gravity and water absorption according to the present invention is carried out by applying the above-described water absorption method (column (A)) and drying method (column (B)). .
The flow of the method for measuring specific gravity and water absorption according to the present invention will be described with reference to FIG.
[0033]
First, a water absorption step is performed as described in the above section (A). That is, the lock material is housed in the container, the container is filled with degassed water, and the container is depressurized to make the lock material saturated (S10), and in this state, the apparent mass m2 of the lock material in water. Is measured (S11). Subsequently, the lock material is taken out, the moisture adhering to the surface is wiped off with a cloth having a water-absorbing property, and the mass m1 of the lock material in the surface dry and saturated state is measured (S12).
[0034]
Subsequently, a drying step is performed as described in the above section (B). That is, in order to dry the lock material in the surface dry and saturated state, the lock material is stored in a container from which moisture has been removed, and the container is depressurized to make the lock material absolutely dry (S13).
[0035]
Subsequently, the lock material is taken out, and the mass m4 of the lock material in an absolutely dry state is measured (S14). Finally, the specific gravity Ds of the lock material in the surface dry and saturated state, the specific gravity Dd of the lock material in the absolute dry state, and the water absorption Q are calculated according to the above-described equations (1) to (3) (S15).
[0036]
According to the method for measuring the specific gravity and the water absorption of the present invention, the time required to calculate the specific gravity and the water absorption of the rock material mainly composed of diaphyrite tuff, slate and the like of about 100 mmφ is only about 30 minutes, and JIS The specific gravity and the water absorption of the lock material could be calculated very quickly as compared with the conventional method and the conventional method.
[0037]
Further, with respect to the same lock material, the water absorption and the specific gravity obtained by the JIS method and the method for measuring the specific gravity and the water absorption of the present invention were compared, and it was confirmed that the two coincided within the range of the error.
[0038]
Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various modifications that embody the technical idea of the present invention are possible.
[0039]
【The invention's effect】
The present invention has the following remarkable effects.
According to the water absorption method of the present invention, the lock material is housed in a closed container filled with degassed water, and the closed container is depressurized to forcibly generate bubbles from the lock material and cause the lock material to absorb water. The lock material can be saturated more quickly than the water absorption method used in the method. In addition, since the lock material is forcibly made to absorb water, there is little variation in water absorption depending on the material of the lock material. Furthermore, since water is absorbed at normal temperature, there is no possibility that the lock material is broken unlike the boiling method (claim 1).
[0040]
According to the drying method of the present invention, the lock material is housed in a closed container, and the pressure in the closed container is reduced to forcibly evaporate the water from the lock material. The lock material can be made to be in an absolute dry state much more quickly than by the method (claim 2).
[0041]
According to the method for measuring the specific gravity and the water absorption of the lock material of the present invention, the specific gravity and the water absorption of the lock material can be calculated much more quickly than the JIS method or the conventional method with the same accuracy as the JIS method. (Claim 3).
[Brief description of the drawings]
FIG. 1 is a schematic view of a container used in the present invention.
FIG. 2 is a flowchart of a method for measuring the specific gravity and the water absorption of a lock material according to the present invention.
FIG. 3 is a flowchart of a method for measuring the specific gravity and the water absorption of a lock material according to the JIS method.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylindrical part 2 Cover 3 Bottom 4 Bolt 5 Introducing pipes 5a, 6a Valve 6 Air vent pipe 7 Decompression pipe

Claims (3)

脱気水を満たした密閉容器中にロック材を収納し、前記密閉容器を減圧することを特徴とするロック材の吸水方法。A method for absorbing water from a lock material, comprising: storing a lock material in a closed container filled with degassed water; and depressurizing the closed container. 密閉容器中にロック材を収納し、前記密閉容器を減圧することを特徴とするロック材の乾燥方法。A method for drying a lock material, comprising: storing a lock material in a closed container; and depressurizing the closed container. 脱気水を満たした密閉容器中にロック材を収納し、前記密閉容器を減圧する吸水工程と、
密閉容器中にロック材を収納し、前記密閉容器を減圧する乾燥工程と、
を有することを特徴とするロック材の比重及び吸水率の測定方法。
A water absorbing step of storing the lock material in a closed container filled with degassed water and depressurizing the closed container,
A drying step of storing the lock material in a closed container and depressurizing the closed container,
A method for measuring the specific gravity and the water absorption of a lock material, comprising:
JP2002179480A 2002-06-20 2002-06-20 Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method Pending JP2004020512A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002179480A JP2004020512A (en) 2002-06-20 2002-06-20 Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002179480A JP2004020512A (en) 2002-06-20 2002-06-20 Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method

Publications (1)

Publication Number Publication Date
JP2004020512A true JP2004020512A (en) 2004-01-22

Family

ID=31176866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002179480A Pending JP2004020512A (en) 2002-06-20 2002-06-20 Method for measuring specific gravity and water absorption of lock material, water absorption method, an drying method

Country Status (1)

Country Link
JP (1) JP2004020512A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103383333A (en) * 2013-06-24 2013-11-06 云南烟草科学研究院 Determination method for absorption rate of tobacco peduncle material liquid and device thereof
CN106198298A (en) * 2016-08-29 2016-12-07 长安大学 A kind of negative pressure water absorber of material
CN112304799A (en) * 2020-06-24 2021-02-02 成都理工大学 Method for quantitatively analyzing organic matters in different occurrence states of shale oil reservoir

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103383333A (en) * 2013-06-24 2013-11-06 云南烟草科学研究院 Determination method for absorption rate of tobacco peduncle material liquid and device thereof
CN106198298A (en) * 2016-08-29 2016-12-07 长安大学 A kind of negative pressure water absorber of material
CN112304799A (en) * 2020-06-24 2021-02-02 成都理工大学 Method for quantitatively analyzing organic matters in different occurrence states of shale oil reservoir

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