JPH1194990A - Concrete for radiation shielding - Google Patents

Concrete for radiation shielding

Info

Publication number
JPH1194990A
JPH1194990A JP27654197A JP27654197A JPH1194990A JP H1194990 A JPH1194990 A JP H1194990A JP 27654197 A JP27654197 A JP 27654197A JP 27654197 A JP27654197 A JP 27654197A JP H1194990 A JPH1194990 A JP H1194990A
Authority
JP
Japan
Prior art keywords
concrete
radiation shielding
sludge solid
sludge
radiation
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP27654197A
Other languages
Japanese (ja)
Inventor
Tsugumichi Watabe
嗣道 渡部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujita Corp
Original Assignee
Fujita Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujita Corp filed Critical Fujita Corp
Priority to JP27654197A priority Critical patent/JPH1194990A/en
Publication of JPH1194990A publication Critical patent/JPH1194990A/en
Pending legal-status Critical Current

Links

Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Landscapes

  • Treatment Of Sludge (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain sufficient shielding performance of radiation without scattering by using specific materials conventionally disposed as industrial waste and not effectively used as components for concrete for radiation shielding. SOLUTION: Sludge solid being one of materials disposed as industrial waste and desired to be effectively used is used as a component of concrete for radiation shield. The sludge solid is a material massively generated out of ready- mixed concrete factories all over Japan and namely contains cement hydrate (70 to 90%) and the rest is aggregate. The sludge solid is defined in JIS A5308. The composition of sludge solid used in concrete for radiation shield is desired to be 50 kg/m<3> or more and 200 kg/m<3> or higher, for example. The water content in sludge solid is desired to be 5 wt.% or higher, e.g. at least 10 wt.%.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、放射線遮蔽用コン
クリートに関するものであり、さらに詳しくは本発明
は、従来産業廃棄物として処分され、利用されていなか
ったスラッジ固形分を有効に利用し、とくに中性子線の
放射線の遮蔽性能を向上させた放射線遮蔽用コンクリー
トに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to radiation shielding concrete, and more particularly, to the present invention which makes effective use of sludge solids which have been disposed of as industrial waste and have not been used. The present invention relates to radiation shielding concrete with improved neutron radiation shielding performance.

【0002】[0002]

【従来の技術】原子力発電所に代表される核燃料施設
は、例えば核分裂反応に伴う放射線、例えば中性子線や
γ線を外部環境に放出しないことが厳しく要求されてい
る。これらの放射線を遮蔽する遮蔽体としては、代表的
なものとしてコンクリートが挙げられる。コンクリート
は比重も高く、γ線を良好に遮蔽することができる。ま
た、中性子線は、水素原子を有する水分により効果的に
遮蔽されることが知られており、コンクリートに水素を
多く含む骨材(水分を多く含む骨材)がその遮蔽体の重
要成分として利用されている。水分を多く含む骨材とし
ては、結晶水の多い褐鉄鉱や蛇紋岩等が挙げられる。
2. Description of the Related Art A nuclear fuel facility typified by a nuclear power plant is strictly required not to emit, for example, radiation accompanying a fission reaction, for example, neutron rays or γ rays to the external environment. A typical example of a shield that shields these radiations is concrete. Concrete has a high specific gravity and can shield gamma rays well. It is known that neutron beams are effectively shielded by moisture containing hydrogen atoms, and concrete containing a large amount of hydrogen (aggregate containing a large amount of water) is used as an important component of the shield. Have been. Aggregates containing a large amount of water include limonite, serpentine, and the like, which have a large amount of water of crystallization.

【0003】しかしながら、これらの骨材は自然石であ
り、必然的にその品質にバラツキがあるものであって、
所望の放射線の遮蔽効果を得るには、褐鉄鉱や蛇紋岩等
の採掘場所が特定されてしまうなど、供給体制に問題が
あり、また資源の埋蔵量等の問題がある。
[0003] However, these aggregates are natural stones, and their quality is necessarily inconsistent.
In order to obtain the desired radiation shielding effect, there is a problem in the supply system, such as the fact that mining sites such as limonite and serpentine are specified, and there is a problem in reserves of resources.

【0004】[0004]

【発明が解決しようとする課題】したがって本発明の目
的は、原料の供給体制に問題がなく、地球資源の保護に
も貢献し、しかもバラツキなく十分な放射線の遮蔽性能
を得ることができる放射線遮蔽用コンクリートを提供す
ることである。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a radiation shielding system which has no problem in the supply system of raw materials, contributes to the protection of earth resources, and can obtain sufficient radiation shielding performance without variation. It is to provide concrete for use.

【0005】[0005]

【課題を解決するための手段】本発明者らは鋭意研究を
行った結果、従来産業廃棄物として処分され、有効利用
がされていなかったある材料を、放射線遮蔽用コンクリ
ートの一成分として用いることによって上記の従来の課
題が解決されることを見いだし、本発明を完成すること
ができた。すなわち本発明は、JIS A 5308に
規定されるスラッジ固形分を含有してなる放射線遮蔽用
コンクリートを提供するものである。また本発明は、前
記スラッジ固形分の配合量が50kg/m3 以上である
前記の放射線遮蔽用コンクリートを提供するものであ
る。さらに本発明は、前記スラッジ固形分の含水率が5
重量%以上である前記の放射線遮蔽用コンクリートを提
供するものである。
Means for Solving the Problems As a result of intensive studies, the present inventors have determined that certain materials that have been conventionally disposed of as industrial waste and have not been used effectively can be used as one component of concrete for radiation shielding. As a result, the above-mentioned conventional problems can be solved, and the present invention has been completed. That is, the present invention provides a concrete for radiation shielding comprising a sludge solid content specified in JIS A 5308. The present invention also provides the radiation shielding concrete, wherein the amount of the sludge solid content is 50 kg / m 3 or more. Further, the present invention provides a method for producing a sludge having a water content of 5%.
It is intended to provide the radiation shielding concrete of not less than% by weight.

【0006】[0006]

【発明の実施の形態】近年の地球環境への関心の高まり
から、現在、産業廃棄物の有効利用に深い関心が寄せら
れていることは、周知のとおりである。本発明は、従来
産業廃棄物として処分されていたものの一つであり、そ
の有効利用が望まれていたスラッジ固形分を、放射線遮
蔽用コンクリートの一成分として利用するものである。
従来、人工的に製造される物質で、中性子線等の放射線
の遮蔽に有効に機能しコンクリートに配合可能な材料は
見いだされていなかった。スラッジ固形分は、レディミ
クストコンクリート工場、すなわち日本全国の生コンク
リート工場から大量に生じている材料であり、主として
セメント水和物を含み(70〜90%程度)、残部は骨
材である。スラッジ固形分は、JIS A5308にも
規定されている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS It is well known that the interest in the effective use of industrial waste has been deepened at present due to the growing interest in the global environment in recent years. The present invention utilizes sludge solids, which have been conventionally disposed of as industrial waste, and whose effective use is desired, as one component of radiation shielding concrete.
Heretofore, no artificially produced material has been found that functions effectively to shield radiation such as neutrons and can be incorporated into concrete. Sludge solid content is a material produced in large quantities from a ready-mixed concrete plant, that is, a ready-mixed concrete plant nationwide in Japan, mainly contains cement hydrate (about 70 to 90%), and the remainder is aggregate. Sludge solid content is also specified in JIS A5308.

【0007】本発明の放射線遮蔽用コンクリートは、ス
ラッジ固形分を含有することが特徴であって、それ以外
の材料は、従来のそれと同じものを利用することができ
る。例えばセメントとしては、普通セメント、早強セメ
ント、中庸熱セメント等を利用することができ、とくに
制限されない。また、細骨材、粗骨材等もとくに制限さ
れないが、本発明では放射線、とくに中性子線を遮蔽す
るための有効な材料としてスラッジ固形分を使用するた
めに、従来のように水分を多く含む骨材としての褐鉄鉱
や蛇紋岩等をとくに使用する必要がない。さらに、水セ
メント比や骨材類の配合量等も従来と同じであることが
でき、適宜選択することができる。さらにまた、AE減
水剤等の各種添加剤も適宜使用することができる。な
お、本発明の放射線遮蔽用コンクリートにおいては、必
要に応じて配合材料も適宜選択・省略することもでき、
例えば粗骨材を使用しない場合も一つの態様となり得る
(これは一般的にいうモルタルである)。
[0007] The radiation shielding concrete of the present invention is characterized by containing a solid content of sludge, and other materials can be the same as conventional ones. For example, as cement, ordinary cement, early-strength cement, moderate heat cement and the like can be used, and there is no particular limitation. In addition, fine aggregates, coarse aggregates and the like are not particularly limited, but in the present invention, in order to use sludge solids as an effective material for shielding radiation, especially neutron rays, contains a large amount of water as in the past There is no need to use lignite or serpentine as aggregate. Further, the water-cement ratio, the amount of aggregates, and the like can be the same as in the conventional art, and can be appropriately selected. Furthermore, various additives such as an AE water reducing agent can be appropriately used. In the radiation shielding concrete of the present invention, the compounding material can also be appropriately selected / omitted as necessary,
For example, even in the case where coarse aggregate is not used, one embodiment can be adopted (this is generally called mortar).

【0008】本発明の放射線遮蔽用コンクリートに使用
されるスラッジ固形分の配合量は、50kg/m3
上、例えば200kg/m3 以上であることが望まし
い。この範囲によれば、遮蔽体として望まれる強度を維
持しながら、放射線を有効に遮蔽することができる。ま
た、スラッジ固形分の配合量を増減させることにより、
目的に応じた放射線の遮蔽性能を得ることができる。
[0008] The compounding amount of the sludge solid content used in the radiation shielding concrete of the present invention is desirably 50 kg / m 3 or more, for example, 200 kg / m 3 or more. According to this range, the radiation can be effectively shielded while maintaining the strength desired as the shield. Also, by increasing or decreasing the amount of sludge solids,
The radiation shielding performance according to the purpose can be obtained.

【0009】また、本発明の放射線遮蔽用コンクリート
に使用されるスラッジ固形分の含水率は、5重量%以
上、例えば10重量%以上であることが望ましい。この
含水率によれば、放射線を一層有効に遮蔽することがで
きる。なお、ここで言う含水率とは、セメント中の自由
水を除いた結合水を対象にしている。またスラッジ固形
分に含まれる骨材に含まれる水分量は無視するものとす
る。
[0009] The water content of the sludge solid used in the radiation shielding concrete of the present invention is desirably 5% by weight or more, for example, 10% by weight or more. According to this moisture content, radiation can be more effectively shielded. In addition, the water content mentioned here targets bound water excluding free water in cement. Also, the amount of water contained in the aggregate contained in the sludge solids is neglected.

【0010】本発明の放射線遮蔽用コンクリートに使用
されるスラッジ固形分は、コンクリートに配合される前
に、水分量を調節するために乾燥したり、粉末状にする
ことができる。また骨材量を減じてセメント量を多くし
たい場合は、乾燥させたものをふるいにかけて大きな粒
径の骨材を取り除くことができる。
[0010] The sludge solids used in the radiation shielding concrete of the present invention can be dried or powdered in order to control the amount of water before being mixed with the concrete. When it is desired to increase the amount of cement by reducing the amount of aggregate, the dried material can be sieved to remove aggregate having a large particle size.

【0011】[0011]

【実施例】以下、本発明を実施例および比較例により説
明するが、本発明はこれらの例により限定されるもので
はない。 (実施例および比較例)スラッジ固形分を用いた本発明
の放射線遮蔽用コンクリートの配合例を表1に、用いな
い放射線遮蔽用コンクリートの配合例を表2に示す。
The present invention will be described below with reference to examples and comparative examples, but the present invention is not limited to these examples. (Examples and Comparative Examples) Table 1 shows a composition example of the radiation shielding concrete of the present invention using the sludge solid content, and Table 2 shows a composition example of the radiation shielding concrete not using the sludge solid content.

【0012】[0012]

【表1】 [Table 1]

【0013】[0013]

【表2】 [Table 2]

【0014】表1によれば、スラッジ固形分の組成(重
量比)をセメント4および骨材1とし、該セメント中の
結合水量を25%とすると、スラッジ固形分の結合水量
は80kg/m3 となる。また、スラッジ固形分以外の
セメントの結合水量は調査の結果81kg/m3 であっ
た。したがって、自由水を除いた放射線遮蔽用コンクリ
ートの水分量は約161kg/m3 となる。これは、コ
ンクリート重量の7.3重量%を占め、十分な中性子線
遮蔽効果を示すものである。また、スラッジ固形分の配
合による放射線遮蔽用コンクリートの強度の低下は見ら
れない。表2は、スラッジ固形分を配合しなかった例で
あるが、表1と同様に計算すると、自由水を除いた放射
線遮蔽用コンクリートの水分量は約81kg/m3 とな
る。これは、コンクリート重量の3.6重量%に過ぎ
ず、これでは十分な中性子線遮蔽効果は認められない。
According to Table 1, when the composition (weight ratio) of the sludge solid content is cement 4 and aggregate 1, and the amount of bound water in the cement is 25%, the bound water amount of the sludge solid is 80 kg / m 3. Becomes In addition, the amount of bound water of the cement other than the sludge solid content was 81 kg / m 3 as a result of the investigation. Therefore, the water content of the radiation shielding concrete excluding free water is about 161 kg / m 3 . This accounts for 7.3% by weight of the concrete weight, and shows a sufficient neutron shielding effect. Also, no reduction in the strength of the radiation shielding concrete due to the blending of the sludge solids is observed. Table 2 is an example in which the sludge solid content was not blended. When calculated in the same manner as in Table 1, the water content of the radiation shielding concrete excluding free water is about 81 kg / m 3 . This is only 3.6% by weight of the concrete weight, and a sufficient neutron shielding effect cannot be recognized with this.

【0015】[0015]

【発明の効果】本発明の放射線遮蔽用コンクリートは、
従来産業廃棄物として処分されていたスラッジ固形分を
含有しているので、十分な放射線の遮蔽効果が得られ、
また地球の環境・資源を保全した優れた遮蔽体である。
本発明の放射線遮蔽用コンクリートは、スラッジ固形分
を含有しているが、コンクリートの比重も低下すること
がなく、γ線等の遮蔽性能も維持される。スラッジ固形
分は、全国に多く存在する生コンクリート工場から得る
ことができ、その排出量も多いため、供給体制に問題は
ない。さらにスラッジ固形分は、自然石に見られるほど
品質にバラツキがない。
The concrete for radiation shielding according to the present invention comprises:
Because it contains sludge solids that were conventionally disposed of as industrial waste, a sufficient radiation shielding effect was obtained,
It is an excellent shield that protects the environment and resources of the earth.
Although the radiation shielding concrete of the present invention contains a solid content of sludge, the specific gravity of the concrete does not decrease and the shielding performance against γ-rays and the like is maintained. Sludge solids can be obtained from ready-mixed concrete factories that exist in many parts of the country, and the amount of discharged sludge is large. In addition, the sludge solids are not as variable in quality as found in natural stone.

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 JIS A 5308に規定されるスラ
ッジ固形分を含有してなる放射線遮蔽用コンクリート。
1. A radiation shielding concrete containing a sludge solid content specified in JIS A 5308.
【請求項2】 前記スラッジ固形分の配合量が50kg
/m3 以上である請求項1に記載の放射線遮蔽用コンク
リート。
2. The compounding amount of the sludge solid content is 50 kg.
/ M 3 or more in a radiation shielding concrete of claim 1.
【請求項3】 前記スラッジ固形分の含水率が5重量%
以上である請求項1または2に記載の放射線遮蔽用コン
クリート。
3. The water content of the sludge solid content is 5% by weight.
The radiation shielding concrete according to claim 1 or 2, which is the above.
JP27654197A 1997-09-22 1997-09-22 Concrete for radiation shielding Pending JPH1194990A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27654197A JPH1194990A (en) 1997-09-22 1997-09-22 Concrete for radiation shielding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27654197A JPH1194990A (en) 1997-09-22 1997-09-22 Concrete for radiation shielding

Publications (1)

Publication Number Publication Date
JPH1194990A true JPH1194990A (en) 1999-04-09

Family

ID=17570920

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27654197A Pending JPH1194990A (en) 1997-09-22 1997-09-22 Concrete for radiation shielding

Country Status (1)

Country Link
JP (1) JPH1194990A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117776633A (en) * 2024-02-27 2024-03-29 中铁二十二局集团轨道工程有限公司 Preparation method of shield segment concrete
CN117776633B (en) * 2024-02-27 2024-06-07 中铁二十二局集团轨道工程有限公司 Preparation method of shield segment concrete

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117776633A (en) * 2024-02-27 2024-03-29 中铁二十二局集团轨道工程有限公司 Preparation method of shield segment concrete
CN117776633B (en) * 2024-02-27 2024-06-07 中铁二十二局集团轨道工程有限公司 Preparation method of shield segment concrete

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