JP2001206750A - Sludge reducing material, centrifugally formed body made using the same and method for manufacturing the body - Google Patents
Sludge reducing material, centrifugally formed body made using the same and method for manufacturing the bodyInfo
- Publication number
- JP2001206750A JP2001206750A JP2000013665A JP2000013665A JP2001206750A JP 2001206750 A JP2001206750 A JP 2001206750A JP 2000013665 A JP2000013665 A JP 2000013665A JP 2000013665 A JP2000013665 A JP 2000013665A JP 2001206750 A JP2001206750 A JP 2001206750A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- reducing material
- cement
- sludge reducing
- concrete
- 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.)
- Granted
Links
Classifications
-
- 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
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/10—Clay
- C04B14/104—Bentonite, e.g. montmorillonite
-
- 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
- C04B2103/0004—Compounds chosen for the nature of their cations
- C04B2103/0006—Alkali metal or inorganic ammonium compounds
- C04B2103/0008—Li
-
- 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
- C04B2103/60—Agents for protection against chemical, physical or biological attack
- C04B2103/603—Agents for controlling alkali-aggregate reactions
-
- 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
- C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スラッジ低減材、
それを使用してなる遠心成型体、及びその製造方法に関
し、詳しくはモルタル又はコンクリートを遠心成型して
製造する、コンクリートパイル、ポール、鋼管複合パイ
ル、鋼管ライニング、及びヒューム管等の製造時に発生
するスラッジを低減又は防止するスラッジ低減材、それ
を使用してなる遠心成型体、及びその製造方法に関す
る。なお、本発明でいう部や％は特に規定のないかぎり
質量基準である。TECHNICAL FIELD The present invention relates to a sludge reducing material,
A centrifugal molded body using the same, and a method for producing the same, more specifically, are produced when a concrete pile, a pole, a steel pipe composite pile, a steel pipe lining, and a fume pipe are manufactured by centrifugally molding mortar or concrete. The present invention relates to a sludge reducing material for reducing or preventing sludge, a centrifugally molded body using the same, and a method for producing the same. In the present invention, parts and percentages are based on mass unless otherwise specified.
【０００２】[0002]
【従来の技術とその課題】通常、パイルやポールなど、
遠心成型によって製造されるコンクリート製品の製造時
には、遠心力によって管の内面にスラッジが絞り出され
てくる。このスラッジは、水の他に固形分として20〜40
％のセメントや砂の微粒分を含有し、強アルカリである
ため、公害防止上、そのまま工場外に廃棄することはで
きず、固形分の沈殿濾過廃棄処理や廃水の中和処理に多
くの時間と経費をかけているのが現状であった。2. Description of the Related Art Conventionally, piles, poles, etc.
When manufacturing a concrete product manufactured by centrifugal molding, sludge is squeezed out on the inner surface of the pipe by centrifugal force. This sludge has a solid content of 20 to 40 in addition to water.
% Of fine particles of cement and sand, and is a strong alkali, so it cannot be disposed of outside the factory as it is for pollution prevention. It was the current situation that was spending money.
【０００３】このスラッジの発生を低減又は防止するた
めに、ベントナイト、又は、ベントナイト、シリカ質微
粉末、及び粘土鉱物を使用するスラッジ低減材が提案さ
れている（特開平03−247543号公報）。しかしながら、
このスラッジ低減材はスラッジの発生を低減又は防止す
るには有効であるが、アルカリ骨材反応の抑制には充分
ではなかった。[0003] In order to reduce or prevent the generation of this sludge, a sludge reducing material using bentonite or bentonite, fine silica powder, and clay mineral has been proposed (Japanese Patent Application Laid-Open No. 03-247543). However,
Although this sludge reducing material is effective in reducing or preventing the generation of sludge, it was not sufficient to suppress the alkali-aggregate reaction.
【０００４】また、一般にパイルやポールなどのコンク
リート製品では早期に高強度を得るため、単位セメント
量が多く、アルカリ総量が大きくなる。このため、アル
カリ骨材反応において無害でない反応性骨材が使用され
た場合には、アルカリ骨材反応により長期的にコンクリ
ートにひび割れが生じ、耐久性が損なわれる場合があっ
た。このため、スラッジの発生を低減又は防止するとと
もに、アルカリ骨材反応を抑制する材料が求められてい
た。In general, concrete products such as piles and poles require a large amount of cement and a large amount of alkali in order to obtain high strength at an early stage. For this reason, when a reactive aggregate that is not harmful in the alkali-aggregate reaction is used, cracks may occur in concrete for a long term due to the alkali-aggregate reaction, and durability may be impaired. For this reason, a material that reduces or prevents the generation of sludge and suppresses the alkali-aggregate reaction has been demanded.
【０００５】本発明者は、種々の検討を重ねた結果、特
定のスラッジ低減材を使用することにより、前記課題を
解決できるとの知見を得て、本発明を完成するに至っ
た。As a result of various studies, the present inventors have found that the above-mentioned problems can be solved by using a specific sludge reducing material, and have completed the present invention.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明は、リチウ
ムベントナイトを含有するスラッジ低減材であり、セメ
ントと該スラッジ低減材を含有するセメント組成物であ
り、それを使用してなる遠心成型体であり、更にコンク
リートを混練する際に、該スラッジ低減材をコンクリー
トに添加して、遠心成型することを特徴とする遠心成型
体の製造方法である。That is, the present invention relates to a sludge-reducing material containing lithium bentonite, a cement composition containing the cement and the sludge-reducing material, and a centrifugally molded article using the same. And a method of manufacturing a centrifugally molded product, which comprises adding the sludge reducing material to concrete when kneading the concrete and centrifugally molding the concrete.
【０００７】[0007]
【発明の実施の形態】以下、本発明を詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
【０００８】本発明のスラッジ低減材を使用すること
で、コンクリートの保水力を増し、遠心成型時に発生す
るスラッジを低減でき、かつ、アルカリ骨材反応を抑制
することが可能となる。By using the sludge reducing material of the present invention, it is possible to increase the water retention capacity of concrete, reduce the sludge generated during centrifugal molding, and suppress the alkali-aggregate reaction.
【０００９】本発明で使用するリチウムベントナイト
（以下、Liベントという）とは、特に限定されるもので
はないが、カオリナイト、モンモリロナイト、及びマイ
カ等の層状構造を有するアルミノシリケートであり、そ
の層間にリチウムを含有するものを総称するもので、膨
潤性を有するものである。Liベントの膨潤性は産地や鉱
床によって異なるが、A.C.C.法（American Collid Camp
any規格）による膨潤度が５〜40程度のものが好まし
い。膨潤度が５未満では保水力が不足し、スラッジ低減
効果が充分に得られない場合がある。Liベントの構造
は、通常、Si4+を中心とする酸素四面体の二次元シート
とAl3+を中心とする酸素八面体のシートの組合わせで層
状構造を形成している。この四面体のSi4+をAl3+と置換
することによって生じた層電荷により、層間にイオン交
換可能なリチウムを担持することが可能となる。層間に
担持されたリチウムイオンは、イオン交換反応によりNa
イオンやＫイオンと交換される。本発明では、Liベント
を用いることで、NaイオンやＫイオンを捕集でき、アル
カリ骨材反応の主要因であるナトリウムやカリウムの量
を低減することが可能である。本発明のLiベント中のリ
チウム含有量は特に限定されるものではないが、Liベン
ト100部中、Li2O量として、２部以上が好ましく、３部
以上がより好ましい。２部未満では充分なアルカリ骨材
反応の抑制効果が得られない場合がある。Liベントの合
成手段は特に限定されるものではないが、まず、Na、
Ｋ、又はCaのベントナイトを合成しておき、これらをリ
チウム塩の水溶液に分散させ、イオン交換してLiベント
とする方法や、合成時にあらかじめリチウムフッ化物等
を混合しておき、直接的に合成する方法などがある。[0009] The lithium bentonite (hereinafter referred to as Li bent) used in the present invention is not particularly limited, but is an aluminosilicate having a layered structure such as kaolinite, montmorillonite, and mica. It is a generic term for those containing lithium and has swelling properties. Although the swellability of Li vent varies depending on the production area and ore deposit, the ACC method (American Collid Camp
Those having a swelling degree of about 5 to 40 according to any standard are preferred. If the degree of swelling is less than 5, the water retention capacity is insufficient, and the effect of reducing sludge may not be sufficiently obtained. The structure of the Li vent generally forms a layered structure by combining a two-dimensional sheet of oxygen tetrahedron centered on Si 4+ and an oxygen octahedron sheet centered on Al 3+ . The layer charge generated by replacing the tetrahedral Si 4+ with Al 3+ makes it possible to carry ion-exchangeable lithium between the layers. Lithium ions carried between layers are converted to Na by ion exchange reaction.
Exchanged for ions and K ions. In the present invention, by using the Li vent, it is possible to collect Na ions and K ions, and it is possible to reduce the amounts of sodium and potassium which are the main factors of the alkali-aggregate reaction. Although the lithium content in the Li vent of the present invention is not particularly limited, the Li 2 O content is preferably 2 parts or more, more preferably 3 parts or more, in 100 parts of the Li vent. If the amount is less than 2 parts, a sufficient effect of suppressing the alkali-aggregate reaction may not be obtained. The means for synthesizing Li vent is not particularly limited, but first, Na,
Synthesize bentonite of K or Ca, disperse them in an aqueous solution of lithium salt and ion-exchange to Li vent, or directly mix lithium fluoride etc. before synthesis and synthesize directly There are ways to do that.
【００１０】本発明のスラッジ低減材の使用量は、Liベ
ントの膨潤度が大きいほど、少量でスラッジ低減効果を
示す。通常、単位量で１〜10kg/m3が好ましく、２〜８k
g/m3がより好ましい。１kg/m3未満ではスラッジ低減効
果が充分ではなく、また、充分なアルカリ骨材反応の抑
制効果が得られない場合があり、10kg/m3を越えると単
位水量が増加し、強度が低下するばかりでなく、スラッ
ジの発生量が逆に増加する場合がある。The use amount of the sludge reducing material of the present invention is small and the sludge reducing effect is exhibited as the swelling degree of the Li vent is large. Usually, the unit amount is preferably 1 to 10 kg / m 3 and 2 to 8 k
g / m 3 is more preferred. If it is less than 1 kg / m 3 , the effect of reducing sludge may not be sufficient, and the effect of suppressing the alkali-aggregate reaction may not be sufficient. If it exceeds 10 kg / m 3 , the unit water volume increases and the strength decreases. In addition, the amount of sludge generated may increase.
【００１１】本発明で使用するセメントは特に限定され
るものではなく、通常使用されている普通、早強、超早
強、中庸熱、及び低熱等の各種ポルトランドセメント
や、これらポルトランドセメントに高炉スラグ、フライ
アッシュ、石灰石微粉末、又はシリカ等を混合した各種
混合セメント、さらに、膨張セメントや、微粉スラグを
JIS規格以上に配合したセメント等いずれも使用可能で
ある。さらに、これらに無水石膏を主成分とする高強度
混和材や、膨張材などのセメント混和材を併用すること
も可能である。[0011] The cement used in the present invention is not particularly limited, and various types of portland cement which are usually used, such as ordinary, fast, super fast, moderate heat and low heat, and blast furnace slag are added to these portland cements. , Fly ash, limestone fine powder, various mixed cements mixed with silica, etc., further expanded cement, fine powder slag
Any cement, etc., blended above the JIS standard can be used. Further, a high-strength admixture containing anhydrous gypsum as a main component or a cement admixture such as an expanding agent can be used in combination.
【００１２】本発明では、前記各材料の他に、ＡＥ剤、
減水剤、ＡＥ減水剤、高性能減水剤、高性能ＡＥ減水
剤、流動化剤、消泡剤、増粘剤、防錆剤、防凍剤、収縮
低減剤、高分子エマルジョン、凝結調整剤、ハイドロタ
ルサイト等のアニオン交換体、無機リン酸塩、並びに、
ホウ酸等の一種又は二種以上を本発明の目的を実質的に
阻害しない範囲で使用することが可能である。In the present invention, an AE agent,
Water reducer, AE water reducer, high performance water reducer, high performance AE water reducer, superplasticizer, defoamer, thickener, rust preventive, antifreeze, shrinkage reducer, polymer emulsion, setting regulator, hydro Anion exchangers such as talcite, inorganic phosphates, and
One or more of boric acid and the like can be used in a range that does not substantially inhibit the object of the present invention.
【００１３】コンクリートの練混ぜ方法も特に制限され
るものではなく、通常行われている方法でよい。セメン
トと骨材、及び水等を混合する装置としては、既存の撹
拌装置が使用でき、例えば、傾胴ミキサ、オムニミキ
サ、Ｖ型ミキサ、ヘンシェルミキサ、及びナウタミキサ
等が使用可能である。[0013] The method of mixing concrete is not particularly limited, and may be a commonly used method. As a device for mixing cement, aggregate, water, and the like, an existing stirring device can be used, and for example, a tilting mixer, an omni mixer, a V-type mixer, a Henschel mixer, a Nauta mixer, and the like can be used.
【００１４】本発明のスラッジ低減材の混合方法は、粉
末で混合する方法や、水又は水と減水剤などに懸濁して
混合する方法などが可能であるが、懸濁液にして混合し
た方が、より少量でスラッジ低減効果が現れる面から好
ましい。さらに、減水剤を後添加する練混ぜ方法では、
減水剤を添加した後にスラッジ低減材の懸濁液を添加す
ると、より少量でスラッジ低減効果が発揮されるのでよ
り好ましい。The method of mixing the sludge reducing material of the present invention can be a method of mixing with a powder, or a method of mixing by suspending in water or water and a water reducing agent. However, it is preferable from the viewpoint that the sludge reduction effect appears with a smaller amount. Furthermore, in the mixing method in which the water reducing agent is added later,
It is more preferable to add the suspension of the sludge reducing material after the addition of the water reducing agent, since the sludge reducing effect is exhibited with a smaller amount.
【００１５】遠心成型方法は特に制限されるものではな
く、低速（ＧNo.１〜５）で１〜３分、中速（ＧNo.12〜
18）で３〜５分、及び高速（ＧNo.30〜40）で３〜５分
行う常法が使用可能であるが、本発明のスラッジ低減材
を使用したコンクリートはプラスチックとなるので、軸
方向への伸びを良くするために、また、特に盛込み式の
低スランプのコンクリートを使用する場合には、ジャン
カを防止するために低速のＧNo.を３以下で３分以上行
うのが好ましい。高速のＧNo.や回転時間はスラッジの
発生がなくてコンクリートの締まりが良く、遠心成型後
に製品を運搬する時に衝撃で脱落しない程度であれば特
に限定されるものではない。The centrifugal molding method is not particularly limited, and is performed at a low speed (G No. 1 to 5) for 1 to 3 minutes and at a medium speed (G No. 12 to
It is possible to use an ordinary method of 3 to 5 minutes at 18) and 3 to 5 minutes at high speed (G No. 30 to 40), but concrete using the sludge reducing material of the present invention is plastic, In order to improve the elongation to the ground, and in particular, when using a low-slump concrete of a built-in type, it is preferable to perform the low-speed GNo. The high-speed G No. and rotation time are not particularly limited as long as sludge is not generated and concrete is well-tightened and the product does not fall off by impact when transporting the product after centrifugal molding.
【００１６】[0016]
【実施例】以下、実験例に基づき本発明をさらに詳細に
説明する。Hereinafter, the present invention will be described in more detail based on experimental examples.
【００１７】実験例１ 天然カオリナイト、硝酸マグネシウム、及びフッ化リチ
ウムを主原料とし、Si／Alモル比を調整するため、硝酸
アルミニウムと酸化ケイ素を副原料として使用し、Li2O
量を変えた種々の組成のLiベントを合成した。天然カオ
リナイトを700℃、18時間焼成してメタカオリナイトと
し、これに硝酸マグネシウムを混合した。メタカオリナ
イトのSi／Alモル比が１の場合は、メタカオリナイトと
硝酸マグネシウムをモル比で１：３になるように混合
し、メタカオリナイトのSi／Alモル比が１を越える場合
は、硝酸アルミニウムと酸化ケイ素を混合して調整し
た。これら混合物とフッ化リチウムを重量比１：１で混
合し、大気中で800℃、24時間焼成した。得られた焼成
物に含まれる未反応のフッ化リチウムを蒸留水で洗浄除
去した後に遠心分離した。さらに、フッ化物不純物を除
去するため、飽和ホウ酸で洗浄し、再度蒸留水で洗浄後
遠心分離し、60℃の恒温室で乾燥した。合成したLiベン
トは、粉末Ｘ線回折法で同定し、層状化合物に特有の底
面反射型の回折パターンを示すことを確認した。また、
JIS R 5201に準じてLi2O量を測定した。なお、合成した
Liベントの膨潤度はいずれも35程度であった。水セメン
ト比45％、細骨材率40％、単位セメント量450kg/m3の配
合を用い、コンクリートのスランプが同程度になるよう
に減水剤で調整し、表１に示すLiベントを混練ぜ水の一
部に懸濁させて添加し、コンクリートを作製した。遠心
成型は、専用の型枠に作製したコンクリート18kgを投入
し、低速を２Ｇ×３分、中速を15Ｇ×４分、高速を35Ｇ
×５分の条件で行った。この際、型枠の両端の中空解放
部に蓋をし、スラッジが発生した場合に漏れないように
した。外径20×長さ30×肉厚５cmの遠心成型体を成型
し、遠心成型時に発生するスラッジ量を測定した。結果
を表１に併記する。[0017] Experimental Example 1 Natural kaolinite, magnesium nitrate, and lithium fluoride as a main raw material, to adjust the Si / Al molar ratio, using aluminum nitrate and silicon oxide as secondary raw material, Li 2 O
Li vents of various compositions with varying amounts were synthesized. Natural kaolinite was calcined at 700 ° C. for 18 hours to form metakaolinite, and this was mixed with magnesium nitrate. When the Si / Al molar ratio of metakaolinite is 1, metakaolinite and magnesium nitrate are mixed at a molar ratio of 1: 3, and when the Si / Al molar ratio of metakaolinite exceeds 1, The mixture was adjusted by mixing aluminum nitrate and silicon oxide. These mixtures and lithium fluoride were mixed at a weight ratio of 1: 1 and fired in air at 800 ° C. for 24 hours. Unreacted lithium fluoride contained in the obtained calcined product was washed and removed with distilled water and then centrifuged. Further, in order to remove fluoride impurities, the substrate was washed with saturated boric acid, washed again with distilled water, centrifuged, and dried in a constant temperature chamber at 60 ° C. The synthesized Li vent was identified by a powder X-ray diffraction method and confirmed to exhibit a bottom-reflection-type diffraction pattern unique to the layered compound. Also,
The amount of Li 2 O was measured according to JIS R 5201. In addition, synthesized
The degree of swelling of each Li vent was about 35. Using a water cement ratio of 45%, a fine aggregate ratio of 40%, and a unit cement amount of 450 kg / m 3 , adjust with a water reducing agent so that the slump of concrete is almost the same, and knead the Li vent shown in Table 1. The suspension was added to a part of water and added to make concrete. For centrifugal molding, put 18 kg of concrete made in a special formwork, 2 G × 3 minutes at low speed, 15 G × 4 minutes at medium speed, 35 G at high speed
Performed under conditions of × 5 minutes. At this time, the hollow release portions at both ends of the mold were covered with lids to prevent leakage when sludge was generated. A centrifugally molded body having an outer diameter of 20 × length 30 × thickness 5 cm was molded, and the amount of sludge generated during centrifugal molding was measured. The results are also shown in Table 1.
【００１８】 ＜使用材料＞ 天然カオリナイト：ジョージア産カオリナイト 硝酸マグネシウム：市販試薬１級 硝酸アルミニウム：市販試薬１級 酸化ケイ素：市販試薬１級 フッ化リチウム：市販試薬１級 セメント ：市販普通ポルトランドセメント、比重3.16 細骨材 ：新潟県姫川産川砂、比重2.62 粗骨材 ：新潟県姫川産川砂利、比重2.64、最大骨材寸法25mm 水 ：水道水 減水剤 ：市販高性能減水剤、ポリアルキルアリルスルホン酸塩系<Materials> Natural kaolinite: Kaolinite from Georgia Magnesium nitrate: Commercial reagent first grade Aluminum nitrate: Commercial reagent first grade Silicon oxide: Commercial reagent first grade Lithium fluoride: Commercial reagent first grade Cement: Commercial ordinary Portland cement , Specific gravity 3.16 fine aggregate: river sand from Himekawa, Niigata prefecture, specific gravity 2.62 coarse aggregate: gravel from Himekawa, Niigata prefecture, specific gravity 2.64, maximum aggregate size 25mm water: tap water water reducing agent: commercial high-performance water reducing agent, polyalkyl allyl Sulfonate type
【００１９】[0019]
【表１】 [Table 1]
【００２０】表１から明らかなように、Liベントを配合
することにより、保水力が増し、スラッジ発生量を低減
することが可能である。As is evident from Table 1, the blending of the Li vent can increase the water retention capacity and reduce the amount of sludge generated.
【００２１】実験例２ 砂を用いて実験例１と同様にコンクリートを練混ぜ、５
mmの篩を使用してウエットスクリーニングした。得られ
たモルタルを用いてアルカリシリカ反応性試験を実施し
た。結果を表２に示す。Experimental Example 2 Concrete was mixed with sand in the same manner as in Experimental Example 1, and
Wet-screened using mm sieve. An alkali silica reactivity test was performed using the obtained mortar. Table 2 shows the results.
【００２２】＜使用材料＞ 砂 ：サヌカイト質輝石安山岩、JIS A 5308付属
書７（化学法）により、溶解シリカ量が750mmol/l、ア
ルカリ濃度減少量が200mmol/lで、無害でないと判定さ
れたもの。<Materials Used> Sand: Sanukite pyroxene andesite, according to JIS A 5308 Annex 7 (chemical method), the amount of dissolved silica was 750 mmol / l, and the decrease in alkali concentration was 200 mmol / l. thing.
【００２３】＜測定方法＞ アルカリシリカ反応性試験（モルタルバー法）：JIS A
5308付属書８に準じて測定した。0.1％以上の膨張を示
したものは、無害でないと判定。<Measurement method> Alkali silica reactivity test (mortar bar method): JIS A
It was measured according to Annex 8 of 5308. Those showing an expansion of 0.1% or more were judged to be not harmless.
【００２４】[0024]
【表２】 [Table 2]
【００２５】表２から明らかなように、本発明のスラッ
ジ低減材を使用していないモルタルの膨張率は0.1％を
越え、無害でないと判定されたのに対し、本発明のスラ
ッジ低減材を配合した場合には、0.1％を下回り、無害
と判定され、アルカリ骨材反応の抑制効果を示した。As is apparent from Table 2, the mortar not using the sludge reducing material of the present invention exceeded 0.1% and was determined to be harmless. In this case, the content was less than 0.1%, which was judged to be harmless, indicating an effect of suppressing alkali-aggregate reaction.
【００２６】[0026]
【発明の効果】本発明のスラッジ低減材を使用すること
により、現在、産業廃棄物として処理されているスラッ
ジの発生を低減することが可能であるとともに、アルカ
リ骨材反応を抑制し、耐久性に優れたコンクリート製品
を製造することが可能となる。By using the sludge reducing material of the present invention, it is possible to reduce the generation of sludge which is currently treated as industrial waste, suppress the alkali-aggregate reaction, and improve durability. It is possible to manufacture a concrete product excellent in quality.
Claims (4)
ラッジ低減材。1. A sludge reducing material containing lithium bentonite.
材を含有してなるセメント組成物。2. A cement composition comprising cement and the sludge reducing material according to claim 1.
てなる遠心成型体。3. A centrifugally molded product using the cement composition according to claim 2.
記載のスラッジ低減材をコンクリートに添加して、遠心
成型することを特徴とする遠心成型体の製造方法。4. The method according to claim 1, wherein the concrete is kneaded.
A method for producing a centrifugally molded article, characterized by adding the above described sludge reducing material to concrete and centrifugally molding it.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62278151A (en) * | 1986-05-28 | 1987-12-03 | 日産化学工業株式会社 | Degradation prevention of set concrete |
| JPH03247543A (en) * | 1990-02-21 | 1991-11-05 | Denki Kagaku Kogyo Kk | Limewash-reducing agent and production of centrifugally molded product using same |
| JPH07291687A (en) * | 1994-04-25 | 1995-11-07 | Denki Kagaku Kogyo Kk | Slag-reducing material, centrifugal molded article produced by using the material and its production |
| JPH08217503A (en) * | 1995-02-08 | 1996-08-27 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| WO1997009282A1 (en) * | 1995-09-08 | 1997-03-13 | Fmc Corporation | Concrete compositions and processes for controlling alkali-silica reaction in same |
| US5656075A (en) * | 1995-05-10 | 1997-08-12 | W. R. Grace & Co.-Conn. | Control of expansion in concrete due to alkali silica reaction |
| JPH11199287A (en) * | 1997-10-17 | 1999-07-27 | Denki Kagaku Kogyo Kk | Setting accelerator and quick-setting spray cement concrete |
-
2000
- 2000-01-24 JP JP2000013665A patent/JP4642177B2/en not_active Expired - Lifetime
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62278151A (en) * | 1986-05-28 | 1987-12-03 | 日産化学工業株式会社 | Degradation prevention of set concrete |
| JPH03247543A (en) * | 1990-02-21 | 1991-11-05 | Denki Kagaku Kogyo Kk | Limewash-reducing agent and production of centrifugally molded product using same |
| JPH07291687A (en) * | 1994-04-25 | 1995-11-07 | Denki Kagaku Kogyo Kk | Slag-reducing material, centrifugal molded article produced by using the material and its production |
| JPH08217503A (en) * | 1995-02-08 | 1996-08-27 | Denki Kagaku Kogyo Kk | Cement admixture and cement composition |
| US5656075A (en) * | 1995-05-10 | 1997-08-12 | W. R. Grace & Co.-Conn. | Control of expansion in concrete due to alkali silica reaction |
| WO1997009282A1 (en) * | 1995-09-08 | 1997-03-13 | Fmc Corporation | Concrete compositions and processes for controlling alkali-silica reaction in same |
| JPH11199287A (en) * | 1997-10-17 | 1999-07-27 | Denki Kagaku Kogyo Kk | Setting accelerator and quick-setting spray cement concrete |
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| JP4642177B2 (en) | 2011-03-02 |
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