JP4861565B2 - Weight mortar - Google Patents
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- JP4861565B2 JP4861565B2 JP2001131021A JP2001131021A JP4861565B2 JP 4861565 B2 JP4861565 B2 JP 4861565B2 JP 2001131021 A JP2001131021 A JP 2001131021A JP 2001131021 A JP2001131021 A JP 2001131021A JP 4861565 B2 JP4861565 B2 JP 4861565B2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/0068—Ingredients with a function or property not provided for elsewhere in C04B2103/00
- C04B2103/0082—Segregation-preventing agents; Sedimentation-preventing agents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/0031—Heavy materials, e.g. concrete used as ballast material
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00862—Uses not provided for elsewhere in C04B2111/00 for nuclear applications, e.g. ray-absorbing concrete
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】
【発明の属する技術分野】
本発明は、セメントに対する重量細骨材の割合が多いにもかかわらず材料分離がなく、耐食性に優れた重量モルタルに関する。
【０００２】
【従来の技術】
モルタルのうち、単位容積質量が大きい重量骨材を用いた重量モルタルは、放射線遮蔽壁、耐震壁、遮音壁、機械装置の基礎構造物等の注入用として用いられている。このような重量モルタル組成物においては、骨材の単位容積質量が大きいため材料分離が起こりやすく、モルタルの流動性も悪いなどの問題があった。また、乾燥単位容積質量が３．３ｔ／ｍ3を超えるものはなく、特に、鉄粉を用いる場合には、材料分離や流動性の問題が著しく起こり得るほか、発錆やそれによる膨張ひび割れが起こり、モルタル硬化体として不具合があった。
【０００３】
【発明が解決しようとする課題】
従って、本発明の目的は、耐食性及び耐久性に優れ、しかも材料分離がなく流動性に優れた重量モルタルを提供することにある。
【０００４】
【課題を解決するための手段】
かかる実情において、本発明者らは鋭意研究を行なった結果、特定の耐食合金粉末を用いることにより、錆によるひび割れ等がなく、耐食性及び耐久性に優れ、単位容積質量が大きく、しかもセメントに対する細骨材の割合が高くても材料分離が起こらず、流動性が良好なモルタルが得られることを見出し、本発明を完成した。
【０００５】
すなわち、本発明は、セメント１００重量部に対して、単位容積質量７ｔ／ｍ3以上で粒径０．３mm以下の耐食合金粉末２００〜８００重量部を含有する重量モルタルを提供するものである。
【０００６】
また、本発明は、セメント１００重量部に対して、(A)高炉水砕スラグ微粉末及び／又はポゾラン微粉末を１２〜４８重量部、(B)エトリンガイトを生成する物質３〜２４重量部、(C)単位容積質量７ｔ／ｍ3以上で粒径０．３mm以下の耐食合金粉末２００〜８００重量部、並びに(D)単位容積質量２．７〜４．８ｔ／ｍ3で粒径０．１５mmを超え５mm以下の細骨材１００〜５００重量部を含有する重量モルタルを提供するものである。
【０００７】
さらに、本発明は、前記重量モルタルを含む放射線遮蔽用部材を提供するものである。
【０００８】
【発明の実施の形態】
本発明で用いるセメントは、通常のモルタルに用いられるものであれば特に制限されず、例えば普通、早強、超早強、中庸熱、低熱等のポルトランドセメントのいずれでも使用でき、特に普通ポルトランドセメント、中庸熱ポルトランドセメント、低熱ポルトランドセメントが好ましい。
【０００９】
成分(A)の高炉水砕スラグ微粉末又はポゾラン微粉末としては、シリカ質超微粉末が好ましい。成分(A)は、セメント１００重量部に対して、１２〜４８重量部、特に２３〜４２重量部配合するのが好ましい。
【００１０】
また、成分(B)のエトリンガイトを生成する物質としては、aCaO・bAl2O3・cX又はaCaO・bAl2O3（式中、ａ、ｂ及びｃは任意の数を示し、Ｘはハロゲン原子、アルカリ金属酸化物、CaSO4、Fe2O3等を示す）で表わされる化合物を主成分とするものが挙げられ、これらに石膏を加えたものや、アルカリ金属、珪素、チタン、鉄等が少量含有されているものでも良い。CaOをC、Al2O3をA、Fe2O3をF、Na2OをNとしたとき、CA2、C3A、C2A、CA、C12A7、C4AF、C11A7・CaCl2、C3A4・CaSO4、C8NA3、C11A7・CaF2等があり、具体的には、アルミナセメント、超速硬セメント、カルシウムアルミネート、カルシウムナトリウムアルミネート、アーウィン等が挙げられ、特にアーウィン系クリンカー粉末が好ましい。成分(B)は、セメント１００重量部に対して、３〜２４重量部、特に３〜１２重量部配合するのが好ましい。
【００１１】
成分(C)の耐食合金粉末は、単位容積質量７ｔ／ｍ3以上、好ましくは７．８ｔ／ｍ3以上で、粒径０．３mm以下のものである。このような耐食合金粉末としては、例えばステンレス鋼、Cu−Ni系、Cu-Al系の銅合金、ニクロムやモネルメタル等の粉末が挙げられ、特に耐食性や入手のし易さの点から、ステンレス鋼の粉末が好ましい。
耐食合金粉末は、セメント１００重量部に対して２００〜８００重量部、好ましくは２００〜４００重量部、特に好ましくは３００〜４００重量部配合される。２００重量部未満では乾燥単位容積質量３．３ｔ／ｍ3を達成できず、８００重量部を超えると材料分離が起こる。
【００１２】
また、本発明で用いる成分(D)の細骨材は、単位容積質量２．７〜４．８ｔ／ｍ3のもので、粒径０．１５mmを超え５mm以下のものである。粒径が５mmを超えるものでは、材料分離が起こりやすく、小隙間への充填性が低下する。このような細骨材としては、重晶石、カンラン岩、クロマイト等が挙げられ、１種又は２種以上を組み合わせて用いることができる。
細骨材は、セメント１００重量部に対して１００〜５００重量部、特に３００〜４００重量部配合するのが好ましい。１００重量部未満では、相対的にモルタル中のセメント量が多くなるため発熱が大きくなり、温度応力ひび割れ発生の可能性が高くなり、５００重量部を超えると、材料分離が起こる。
【００１３】
本発明の重量モルタルには、更に減水剤を配合できる。かかる減水剤としては、変性リグニンスルホン酸塩を主成分とするもの（ＬＳ）、ポリアルキルアリルスルホン酸塩のホルマリン縮合物を主成分とするもの（ＮＳ）、メラミンスルホン酸塩のホルマリン縮合物を主成分とするもの（ＭＳ）、ポリカルボン酸を主成分とするもの（ＰＣ）等が挙げられる。
これらの減水剤は、１種又は２種以上を用いることができ、セメント１００重量部に対して、０．９〜４．８重量部、特に０．９〜３重量部配合するのが好ましい。
【００１４】
また、本発明の重量モルタルには、更に消泡剤、発泡剤を配合できる。消泡剤としては、例えばＳＮデフォーマー（サンノプコ社製）等が挙げられ、発泡剤としては、アルミニウム粉末等が挙げられる。消泡剤は、セメント１００重量部に対して０．０１〜１．００重量部、特に０．０１〜０．１０重量部配合するのが好ましく、発泡剤は、セメント１００重量部に対して０．００１〜０．０２重量部、特に０．００１〜０．０１重量部配合するのが好ましい。
更に、石灰系膨張材、カルシウムスルホアルミネート系膨張材（ＣＳＡ系膨張材）等の膨張性物質を配合することもできる。これらの膨張性物質を配合する場合には、セメント１００重量部に対して４．５〜３０重量部、特に６〜２４重量部配合するのが好ましい。
【００１５】
本発明の重量モルタルには、更に水溶性高分子、吸水性高分子を配合でき、より材料分離を抑制することができる。かかる水溶性高分子としては、例えばセルロース系又はアクリル樹脂系増粘剤等が挙げられ；吸水性高分子としては、例えばアクリル酸ナトリウム樹脂等が挙げられる。
【００１６】
本発明において、前記成分(A)及び(B)は、これらを含有する混和材として用いることができる。混和剤には、成分(A)及び(B)以外に、減水剤、消泡剤、発泡剤、膨張性物質等を配合することができる。
【００１７】
本発明の重量モルタルは、前記成分を混合して得られた当該組成物を水と混合して使用することができる。水はセメント１００重量部に対して３０〜１００重量部、特に５０〜８０重量部混合するのが、流動性の点から好ましい。また、単位容積質量が３．５ｔ／ｍ3以上の粗骨材を加えてコンクリートとして使用することも可能である。
また、前記成分のうち、まず(D)細骨材と水を混合し、これに(A)及び(B)を含む混和材、(C)耐食合金粉末、及びセメントを加えて更に混合することによってもモルタルを製造することができる。各成分を混合する割合は、前記と同様であるのが好ましい。
【００１８】
本発明においては、前記耐食合金粉末を用いることにより、乾燥単位容積質量３．３ｔ／ｍ3以上のモルタル硬化体を得ることができる。このような硬化体は、ＪＡＳＳ５Ｎ原子力発電所設備における鉄筋コンクリート工事における遮蔽性能レベルが高い部位に使用することができる。また、更に膨張性物質を配合することにより、原子力設備への充填モルタルとしても好適である。
【００１９】
本発明の重量モルタルは、放射線遮蔽用部材として好適である。放射線遮蔽用部材は、原子炉格納建屋の原子炉遮蔽壁（ＲＳＷ）、放射線遮蔽用壁の逆打ち施工部材、重量ブロック積み工法に使用される仮開口部遮蔽部材、遮蔽規制がある配管貫通孔に充填される部材、レントゲン室等放射線遮蔽が必要とされる箇所に充填される部材等に用いることができる。乾燥単位容積質量３．３ｔ／ｍ3以上が要求される部材として、特に好適である。
【００２０】
【発明の効果】
本発明の重量モルタルは、発錆がなく、耐食性及び耐久性に優れたものである。また、セメントに対する細骨材の割合が高くても材料分離が起こらず、流動性も良好である。更に、発熱による温度上昇が少なく、壁厚が厚いマスモルタルの充填においても、温度応力ひび割れが抑制される。
【００２１】
【実施例】
次に、実施例を挙げて本発明を更に詳細に説明するが、本発明はこれらにより何ら制限されるものではない。
【００２２】
実施例１
表１に示す組成のモルタルを製造した。なお、表中の各成分は以下に示すものを用いた。
得られたモルタルに、組成物中のセメント１００重量部に対する表１に示す量の水を混合し、以下の方法で不分離特性（ブリーディング）を評価した。結果を表１に併せて示す。
【００２３】
（セメント）
普通ポルトランドセメント（単位容積質量３．１６ｔ／ｍ3；太平洋セメント社製）
（金属微粉末１）
ステンレス鋼微粉末（単位容積質量７．８ｔ／ｍ3；粒径０．３０mm以下）
（金属微粉末２）
鉄粉（単位容積質量７．９ｔ／ｍ3；粒径０．３０mm以下）
（細骨材１）
重晶石(単位容積質量４．２ｔ／ｍ3；粗粒率F.M.＝２．５０；粒径０．１５mmを超え５mm以下)
（細骨材２）
クロマイト系骨材（単位容積質量４．７ｔ／ｍ3；粗粒率F.M.＝２．３７；粒径０．１５mmを超え５mm以下）
（細骨材３）
カンラン岩骨材（単位容積質量３．２８ｔ／ｍ3；粗粒率F.M.＝２．８４；粒径０．１５mmを超え５mm以下）
【００２４】
（不分離特性の評価方法）
土木学会コンクリート標準示方書規準編ＪＳＣＥ−Ｆ５４２充填モルタル試験方法（案）に準じて、練り上げたモルタルを充填して、ガラス板で上部に蓋をする。３時間経過後にモルタル表面のブリーディング水を採取し、ブリーディングがないものを○、ブリーディングがあるが採取不可能な僅かな量であるものを△、ブリーディングがあるものを×として評価した。
【００２６】
【表１】
表１の結果より、本発明のモルタルはいずれも、材料分離が生じなかった。
【００２８】
試験例１
実施例１で得られたモルタルについて、２０℃における流動性、練上り単位容積質量、乾燥単位容積質量及び圧縮強度を評価した。結果を表２に示す。
【００２９】
（評価方法）
（１）流動性：
土木学会コンクリート標準示方書規準編ＪＳＣＥ−Ｆ５４２充填モルタル試験方法（案）に準じて、Ｊ１４ロートの流下時間を測定した。また、水平方向の流動性として、ＪＩＳＲ５２０１セメントの物理試験方法にあるフローコーンを用いて、テーブルフローを測定した。この場合、１５回のテーブル落下を実施せず、フローコーンの引き抜きによるモルタルの広がりを測定した。
【００３０】
（２）練上り単位容積質量：
ＪＩＳＡ１１７４まだ固まらないポリマーセメントモルタルの単位容積質量試験方法及び空気量の質量による試験方法（質量方法）に準じて測定した。容重マスは４００ccを用い、練り上がったモルタルを充填し、その重量から練上り単位容積質量を算出した。
【００３１】
（３）乾燥単位容積質量：
建築工事標準仕様書・同解説ＪＡＳＳ５Ｎ原子力発電所施設における鉄筋コンクリート工事のＴ−６０１コンクリートの乾燥単位容積重量試験方法に準じて測定した。なお、供試体は直径１０cm、高さ２０cmの大きさのものを用いた。
【００３２】
（４）圧縮強度：
土木学会コンクリート標準示方書規準編ＪＳＣＥ−Ｆ５４２充填モルタル試験方法（案）の圧縮試験方法に準じて測定した。すなわち、φ５×１０cmの供試体を作成し、２０℃、９０％以上の湿空箱で４８時間養生した後、脱型し、２０℃の水中に材齢２８日まで養生したものについて、圧縮強度試験機にて測定した。
【００３３】
【表２】
表２の結果より、本発明のモルタルはいずれも、Ｊ１４ロート流下時間及びテーブルフローともに流動性に優れ、練上り単位容積質量が３．５ｔ／ｍ3以上で、乾燥単位容積質量は３．３ｔ／ｍ3以上であり、しかも圧縮強度が高いものであった。
【００３５】
試験例２
実施例１で得られた実験No.４〜１０のモルタルについて、ＪＩＳ Ｒ ５２０１（セメントの物理試験方法）に準じて、４×４×１６cmの試験体を３本づつ成形した。これらの試験体を脱型後、７日間２０℃８０％で養生させた。その後、３％食塩水に２４時間浸漬後、７２時間２０℃６０％Ｒ．Ｈ．で乾燥するサイクルを１０サイクル繰り返し、その後にモルタル硬化体表面の状態を目視により観察した。結果を表３に示す。
本発明品（No.５〜１０）では、錆の発生及びそれによる膨張がなく、良好な表面状態であった。
【００３６】
【表３】
BACKGROUND OF THE INVENTION
The present invention relates to a weight mortar excellent in corrosion resistance without material separation despite a high proportion of heavy fine aggregate to cement.
[0002]
[Prior art]
Among mortars, heavy mortars using heavy aggregates with a large unit volume mass are used for injection of radiation shielding walls, earthquake resistant walls, sound insulation walls, machinery infrastructure, and the like. In such a weight mortar composition, since the unit volume mass of the aggregate is large, there is a problem that material separation is likely to occur and the fluidity of the mortar is poor. In addition, there is no dry unit volume mass exceeding 3.3 t / m 3 , and particularly when iron powder is used, material separation and fluidity problems may occur remarkably, and rusting and expansion cracks caused by it may occur. This occurred and there was a problem as a cured mortar.
[0003]
[Problems to be solved by the invention]
Accordingly, an object of the present invention is to provide a weight mortar that is excellent in corrosion resistance and durability, and that has no material separation and has excellent fluidity.
[0004]
[Means for Solving the Problems]
Under such circumstances, the present inventors have conducted intensive research, and as a result, by using a specific corrosion-resistant alloy powder, there is no cracking due to rust, etc., excellent corrosion resistance and durability, a large unit volume mass, and a fineness with respect to cement. It was found that even if the ratio of the aggregate is high, material separation does not occur and a mortar with good fluidity can be obtained, and the present invention has been completed.
[0005]
That is, the present invention provides a weight mortar containing 200 to 800 parts by weight of a corrosion-resistant alloy powder having a unit volume mass of 7 t / m 3 or more and a particle size of 0.3 mm or less with respect to 100 parts by weight of cement.
[0006]
Further, the present invention is based on 100 parts by weight of cement, (A) 12 to 48 parts by weight of granulated blast furnace slag and / or pozzolanic powder, (B) 3 to 24 parts by weight of a substance that produces ettringite, (C) 200 to 800 parts by weight of a corrosion-resistant alloy powder having a unit volume mass of 7 t / m 3 or more and a particle size of 0.3 mm or less, and (D) a unit volume mass of 2.7 to 4.8 t / m 3 and a particle size of 0. A weight mortar containing 100 to 500 parts by weight of fine aggregate of more than 15 mm and not more than 5 mm is provided.
[0007]
Furthermore, the present invention provides a radiation shielding member containing the weight mortar.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The cement used in the present invention is not particularly limited as long as it is used in ordinary mortar. For example, normal, early strength, super early strength, moderate heat, low heat, etc. can be used. Middle heat portland cement and low heat portland cement are preferred.
[0009]
As the blast furnace granulated slag fine powder or pozzolanic fine powder of component (A), siliceous ultrafine powder is preferable. Component (A) is preferably blended in an amount of 12 to 48 parts by weight, particularly 23 to 42 parts by weight, based on 100 parts by weight of cement.
[0010]
As the substance which produces ettringite component (B), 2 O 3 (wherein aCaO · bAl 2 O 3 · cX or aCaO · bAl, a, b and c represents an arbitrary number, X is a halogen atom , Alkali metal oxides, CaSO 4 , Fe 2 O 3, etc.) are used as main components, and those obtained by adding gypsum to these, alkali metals, silicon, titanium, iron, etc. It may be contained in a small amount. When CaO is C, Al 2 O 3 is A, Fe 2 O 3 is F, and Na 2 O is N, CA 2 , C 3 A, C 2 A, CA, C 12 A 7 , C 4 AF, C 11 A 7・ CaCl 2 , C 3 A 4・ CaSO 4 , C 8 NA 3 , C 11 A 7・ CaF 2 etc., specifically, alumina cement, super-hard cement, calcium aluminate, calcium sodium aluminum Nate, Irwin and the like, and Erwin clinker powder is particularly preferable. Component (B) is preferably blended in an amount of 3 to 24 parts by weight, particularly 3 to 12 parts by weight, based on 100 parts by weight of cement.
[0011]
The corrosion-resistant alloy powder of component (C) has a unit volume mass of 7 t / m 3 or more, preferably 7.8 t / m 3 or more and a particle size of 0.3 mm or less. Examples of such corrosion-resistant alloy powder include stainless steel, Cu-Ni-based, Cu-Al-based copper alloy, Nichrome, Monel metal, and other powders. Particularly, in terms of corrosion resistance and availability, stainless steel Is preferred.
The corrosion resistant alloy powder is blended in an amount of 200 to 800 parts by weight, preferably 200 to 400 parts by weight, particularly preferably 300 to 400 parts by weight, based on 100 parts by weight of cement. If it is less than 200 parts by weight, the dry unit volume mass of 3.3 t / m 3 cannot be achieved, and if it exceeds 800 parts by weight, material separation occurs.
[0012]
The fine aggregate of component (D) used in the present invention has a unit volume mass of 2.7 to 4.8 t / m 3 and has a particle size of more than 0.15 mm and not more than 5 mm. When the particle size exceeds 5 mm, material separation is likely to occur, and the filling ability into small gaps is reduced. Examples of such fine aggregates include barite, peridotite, chromite, and the like, and one kind or a combination of two or more kinds can be used.
The fine aggregate is preferably blended in an amount of 100 to 500 parts by weight, particularly 300 to 400 parts by weight, based on 100 parts by weight of cement. When the amount is less than 100 parts by weight, the amount of cement in the mortar is relatively increased, so heat generation is increased, and the possibility of occurrence of thermal stress cracks is increased. When the amount exceeds 500 parts by weight, material separation occurs.
[0013]
A water reducing agent can be further added to the weight mortar of the present invention. Examples of such water reducing agents include those containing modified lignin sulfonate as the main component (LS), those containing polyalkylallyl sulfonate as the main component (NS), and melamine sulfonate as the main component. Those having a main component (MS), those having a polycarboxylic acid as a main component (PC) and the like can be mentioned.
These water reducing agents can be used alone or in combination of two or more, and it is preferably blended in an amount of 0.9 to 4.8 parts by weight, particularly 0.9 to 3 parts by weight, based on 100 parts by weight of cement.
[0014]
Moreover, an antifoamer and a foaming agent can be further mix | blended with the weight mortar of this invention. Examples of the antifoaming agent include SN deformers (manufactured by San Nopco), and examples of the foaming agent include aluminum powder. The antifoaming agent is preferably blended in an amount of 0.01 to 1.00 parts by weight, particularly 0.01 to 0.10 parts by weight, based on 100 parts by weight of cement, and the foaming agent is 0 parts by weight based on 100 parts by weight of cement. It is preferable to add 0.001 to 0.02 parts by weight, particularly 0.001 to 0.01 parts by weight.
Furthermore, expansive substances, such as a lime type expansive material and a calcium sulfoaluminate type expansive material (CSA type expansive material), can also be mix | blended. When blending these expansive substances, it is preferable to blend 4.5 to 30 parts by weight, particularly 6 to 24 parts by weight with respect to 100 parts by weight of cement.
[0015]
The weight mortar of the present invention can further contain a water-soluble polymer and a water-absorbing polymer, and can further suppress material separation. Examples of such water-soluble polymers include cellulose-based or acrylic resin-based thickeners; examples of water-absorbing polymers include sodium acrylate resins.
[0016]
In the present invention, the components (A) and (B) can be used as an admixture containing them. In addition to components (A) and (B), a water reducing agent, an antifoaming agent, a foaming agent, an expandable substance, and the like can be blended in the admixture.
[0017]
The weight mortar of the present invention can be used by mixing the composition obtained by mixing the above components with water. Water is preferably mixed in an amount of 30 to 100 parts by weight, particularly 50 to 80 parts by weight, based on 100 parts by weight of cement. It is also possible to add coarse aggregate having a unit volume mass of 3.5 t / m 3 or more and use it as concrete.
Also, among the above components, first, (D) fine aggregate and water are mixed, and then admixture containing (A) and (B), (C) corrosion resistant alloy powder, and cement are added and further mixed. Can also produce mortar. The mixing ratio of each component is preferably the same as described above.
[0018]
In the present invention, a cured mortar having a dry unit volume mass of 3.3 t / m 3 or more can be obtained by using the corrosion-resistant alloy powder. Such a hardened body can be used for a part having a high shielding performance level in a reinforced concrete construction in a JASS5N nuclear power plant facility. Further, by adding an expansive substance, it is also suitable as a filling mortar for nuclear facilities.
[0019]
The weight mortar of the present invention is suitable as a radiation shielding member. The radiation shielding member is a reactor shielding wall (RSW) of a containment building, a reverse-working member of the radiation shielding wall, a temporary opening shielding member used in the heavy block stacking method, a piping through hole with shielding restriction It can be used for a member filled in the X-ray chamber, a member filled in a place where radiation shielding is required, such as an X-ray room. It is particularly suitable as a member that requires a dry unit volume mass of 3.3 t / m 3 or more.
[0020]
【Effect of the invention】
The weight mortar of the present invention does not rust and has excellent corrosion resistance and durability. Moreover, even if the ratio of fine aggregate to cement is high, material separation does not occur and fluidity is also good. Furthermore, temperature stress cracking is suppressed even in the filling of mass mortar with a small wall thickness due to heat generation.
[0021]
【Example】
EXAMPLES Next, although an Example is given and this invention is demonstrated still in detail, this invention is not restrict | limited at all by these.
[0022]
Example 1
Mortars having the compositions shown in Table 1 were produced. In addition, what was shown below was used for each component in a table | surface.
The obtained mortar was mixed with water in the amount shown in Table 1 with respect to 100 parts by weight of cement in the composition, and the non-separation property (bleeding) was evaluated by the following method. The results are also shown in Table 1.
[0023]
(cement)
Normal Portland cement (unit volume mass 3.16 t / m 3 ; manufactured by Taiheiyo Cement)
(Metal fine powder 1)
Stainless steel fine powder (unit volume mass 7.8 t / m 3 ; particle size 0.30 mm or less)
(Metal fine powder 2)
Iron powder (unit volume mass 7.9 t / m 3 ; particle size 0.30 mm or less)
(Fine aggregate 1)
Barite (unit volume mass 4.2 t / m 3 ; coarse grain ratio FM = 2.50; particle size over 0.15 mm and 5 mm or less)
(Fine aggregate 2)
Chromite aggregate (unit volume mass 4.7 t / m 3 ; coarse particle ratio FM = 2.37; particle size greater than 0.15 mm and less than 5 mm)
(Fine aggregate 3)
Peridotite aggregate (unit volume mass 3.28 t / m 3 ; coarse fraction FM = 2.84; particle size greater than 0.15 mm and less than 5 mm)
[0024]
(Evaluation method of non-separation characteristics)
According to JSCE-F542 filled mortar test method (draft), Japan Society of Civil Engineers Concrete Standard Specification Standards, the mortar is filled and the top is covered with a glass plate. After 3 hours, bleeding water on the surface of the mortar was collected and evaluated as ◯ when there was no bleeding, Δ when there was bleeding but a small amount that could not be collected, and × when there was bleeding.
[0026]
[Table 1]
From the results in Table 1, no material separation occurred in any of the mortars of the present invention.
[0028]
Test example 1
The mortar obtained in Example 1 was evaluated for fluidity at 20 ° C., kneaded unit volume mass, dry unit volume mass, and compressive strength. The results are shown in Table 2.
[0029]
(Evaluation methods)
(1) Fluidity:
According to JSCE-F542 filling mortar test method (draft), the J14 funnel flow time was measured. Moreover, the table flow was measured using the flow cone in the physical test method of JISR5201 cement as a fluidity | liquidity of a horizontal direction. In this case, the table was dropped 15 times, and the spread of the mortar by drawing the flow cone was measured.
[0030]
(2) Kneaded unit volume mass:
It was measured according to a unit volume mass test method of a polymer cement mortar that has not yet solidified and a test method (mass method) based on the mass of air. 400 cc was used as the mass, and the mortar that had been kneaded was filled, and the unit mass of kneaded was calculated from the weight.
[0031]
(3) Dry unit volume mass:
Building Construction Standard Specification / Explanation This was measured according to the dry unit volume weight test method of T-601 concrete for reinforced concrete construction at the JASS5N nuclear power plant facility. A specimen having a diameter of 10 cm and a height of 20 cm was used.
[0032]
(4) Compressive strength:
It measured according to the compression test method of JSCE-F542 filling mortar test method (draft) of Japan Society of Civil Engineers concrete standard specification standard. That is, a specimen having a diameter of 5 × 10 cm was prepared, cured for 48 hours in a humidified air box of 20 ° C. and 90% or more, demolded, and cured in water at 20 ° C. until the age of 28 days. Measured with a testing machine.
[0033]
[Table 2]
From the results of Table 2, all the mortars of the present invention have excellent fluidity in both the J14 funnel flow time and the table flow, the kneaded unit volume mass is 3.5 t / m 3 or more, and the dry unit volume mass is 3.3 t. / M 3 or more and high compressive strength.
[0035]
Test example 2
For the mortars of Experiment Nos. 4 to 10 obtained in Example 1, three 4 × 4 × 16 cm specimens were molded according to JIS R 5201 (cement physical test method). These specimens were cured at 20 ° C. and 80% for 7 days after demolding. Then, after being immersed in 3% saline for 24 hours, 72 hours at 20 ° C. 60% R.D. H. The cycle of drying at 10 times was repeated, and then the state of the mortar cured body surface was visually observed. The results are shown in Table 3.
In the products of the present invention (Nos. 5 to 10), there was no generation of rust and expansion due to this, and the surface state was good.
[0036]
[Table 3]
Claims (2)
(A)高炉水砕スラグ微粉末及び／又はポゾラン微粉末 １２〜４８重量部、
(B)エトリンガイトを生成する物質 ３〜２４重量部、
(C)単位容積質量７ｔ／ｍ3以上で粒径０．３mm以下の耐食合金粉末 ２００〜８００重量部、並びに
(D)単位容積質量２．７〜４．８ｔ／ｍ 3 で粒径０．１５mmを超え５mm以下の細骨材 １００〜５００重量部
を含有し、硬化体の乾燥単位容積質量が３．３ｔ／ｍ 3 以上である重量モルタル。For 100 parts by weight of cement,
(A) Blast furnace granulated slag fine powder and / or 12 to 48 parts by weight of pozzolanic fine powder,
(B) 3-24 parts by weight of a substance that produces ettringite,
(C) Corrosion-resistant alloy powder having a unit volume mass of 7 t / m 3 or more and a particle size of 0.3 mm or less, 200 to 800 parts by weight , and
(D) 100 to 500 parts by weight of fine aggregate having a unit volume mass of 2.7 to 4.8 t / m 3 and a particle size of more than 0.15 mm and 5 mm or less, and a dry unit volume mass of the cured product Is a weight mortar in which is 3.3 t / m 3 or more .
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| JP2006038467A (en) * | 2004-07-22 | 2006-02-09 | Kumagai Gumi Co Ltd | Low-activation concrete composition |
| JP2006038465A (en) * | 2004-07-22 | 2006-02-09 | Kumagai Gumi Co Ltd | Radiation shielding concrete composition |
| JP4532447B2 (en) * | 2006-08-02 | 2010-08-25 | 株式会社間組 | Neutron shielding concrete |
| JP5091058B2 (en) * | 2008-08-29 | 2012-12-05 | 株式会社日立プラントテクノロジー | Hole closing method |
| JP5868192B2 (en) * | 2012-01-20 | 2016-02-24 | 太平洋セメント株式会社 | Cement composition and cement-based cured body |
| JP6959151B2 (en) * | 2018-01-17 | 2021-11-02 | 太平洋マテリアル株式会社 | Mortar composition and mortar |
| JP7495832B2 (en) * | 2020-07-03 | 2024-06-05 | 株式会社安藤・間 | Cement composition and hardened product thereof |
| JP2024127634A (en) * | 2023-03-09 | 2024-09-20 | 株式会社東芝 | Radiation shielding and method for manufacturing the same |
| KR102722555B1 (en) * | 2023-12-29 | 2024-10-29 | 주식회사 동산이엔지 | High-strength mixture composition of cement for steam curing |
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| JPH0660046B2 (en) * | 1986-02-25 | 1994-08-10 | 鹿島建設株式会社 | Heavy grout mortar and filling method using it |
| JPS62207753A (en) * | 1986-03-10 | 1987-09-12 | 電気化学工業株式会社 | Hydraulic composition |
| JPS62207752A (en) * | 1986-03-10 | 1987-09-12 | 電気化学工業株式会社 | High strength hydraulic composition |
| JPH0624813A (en) * | 1992-07-08 | 1994-02-01 | Nippon Steel Corp | Heavy concrete |
| JPH06293549A (en) * | 1993-04-07 | 1994-10-21 | Denki Kagaku Kogyo Kk | Grout mortar composition |
| JP3350238B2 (en) * | 1994-08-10 | 2002-11-25 | 電気化学工業株式会社 | Mechanical base pad and molding method thereof |
| JP3505694B2 (en) * | 1995-04-13 | 2004-03-08 | 同和鉱業株式会社 | Heavy concrete |
| JP3185980B2 (en) * | 1999-02-10 | 2001-07-11 | 鹿島建設株式会社 | Building electromagnetic shielding method |
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