JPH08277156A - Super quick-hardening concrete composition for placing joint and production of super quick-hardening concrete composition using the same - Google Patents
Super quick-hardening concrete composition for placing joint and production of super quick-hardening concrete composition using the sameInfo
- Publication number
- JPH08277156A JPH08277156A JP8037595A JP8037595A JPH08277156A JP H08277156 A JPH08277156 A JP H08277156A JP 8037595 A JP8037595 A JP 8037595A JP 8037595 A JP8037595 A JP 8037595A JP H08277156 A JPH08277156 A JP H08277156A
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- Prior art keywords
- cement
- quick
- hardening
- gypsum
- concrete
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、既設のコンクリートに
新規なコンクリートを打継ぎ、コンクリート構造物を補
強する打継ぎ補修工事用の超速硬コンクリート組成物及
びそれを用いた超速硬コンクリートの製造方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a super-rapid hardening concrete composition for splicing repair work for splicing new concrete to existing concrete to reinforce a concrete structure, and a method for producing super-rapid hardening concrete using the same. Regarding
【0002】[0002]
【従来の技術とその課題】従来、コンクリートは、適切
な設計や施工を行えば、安全で耐久性のある構造物を構
築できる特徴を有しており、補修のいらないメンテナン
スフリーの材料と言われていた。2. Description of the Related Art Conventionally, concrete is a maintenance-free material that does not require repair because it has the characteristic that a structure that is safe and durable can be constructed if it is properly designed and constructed. Was there.
【0003】しかしながら、近年、コンクリートの早期
劣化により耐久性低下が顕在化したコンクリート構造
物、あるいは、設計時に想定もされなかった繰り返し荷
重の増加等により損傷を受けたコンクリート構造物等が
多くなり、これらを補修する必要性が増大している。However, in recent years, the number of concrete structures whose durability has been deteriorated due to early deterioration of concrete, or concrete structures which have been damaged by an increase in repeated load, which was not anticipated at the time of design, has increased. The need for repairing these is increasing.
【0004】これらの補修を必要とするコンクリート構
造物の補修工法として、劣化した部分をはつり取った既
設の旧コンクリートの上面に、緊急を要する場合は、新
コンクリートとして超速硬コンクリートを打設し、新旧
コンクリートを一体化させ、全体的にコンクリートの厚
みを増加したコンクリートの増厚を行うことによりコン
クリートを補修する工法が採られている。この場合、新
たに打ち継ぐ新コンクリートの旧コンクリートへの付着
強度が重要であり、新コンクリートの付着強度が高く、
新旧コンクリートが一体化して、コンクリート厚が増厚
されてはじめて補修効果が発揮される。As a method of repairing concrete structures requiring repair, super-hardening concrete is poured as new concrete on the upper surface of the existing old concrete from which the deteriorated parts have been removed, in case of emergency. A method of repairing concrete is adopted by integrating old and new concrete and increasing the thickness of the concrete, which has increased the overall thickness of the concrete. In this case, the bond strength of the new concrete to be newly spliced to the old concrete is important, and the bond strength of the new concrete is high,
Only when the old and new concrete are integrated and the concrete thickness is increased, the repair effect is exhibited.
【0005】しかしながら、従来は、打ち継がれた新コ
ンクリートにひび割れが発生しやすいため、新旧コンク
リートを一体化しても、その増厚効果は減少するという
課題があった。However, conventionally, since cracks are likely to occur in new concrete that has been spliced in, there has been a problem that even if new and old concrete are integrated, the effect of increasing the thickness is reduced.
【0006】近年、高速道路が我々の生活に占める役割
の重要性が、質的に、また、量的に増大してきている。
一方、自動車交通の予想以上の伸びと車両の大型化や重
量化に伴い、設計時には予想もされなかった損傷を道路
構造物は被っている。特に、高速道路の、鋼材を使用し
た橋梁のRC床版、即ち、鋼橋のRC床版の損傷は橋梁
全体に渡って発生している状況であり、これらに対する
早急の対策が求められている。[0006] In recent years, the importance of the role of expressways in our lives has increased qualitatively and quantitatively.
On the other hand, road structures are suffering damage that was not expected at the time of design, as automobile traffic grew more than expected and vehicles became larger and heavier. In particular, damage to RC slabs of steel bridges on expressways, that is, RC slabs of steel bridges, is occurring over the entire bridge, and immediate countermeasures against these are required. .
【0007】この現象は、東名高速、名神高速、東北
道、中央道、及び中国道の各高速道路をはじめ、一般国
道にも見られている。特に、東名高速道路の鋼橋のRC
床版は、昭和30年代〜40年代にかけて着工されたもので
あり、現行の規準による設計に比べ、床版の支点間隔が
広いうえに床版厚が薄く主筋と直角方向の鉄筋量が少な
い構造になっており、その鋼橋のRC床版の損傷は大き
なものである。This phenomenon is also observed on general national highways including the Tomei Expressway, Meishin Expressway, Tohoku Expressway, Chuo Expressway and Chugoku Expressway. RC of steel bridge of Tomei Expressway
The floor slab was started in the 1960s and 1940s, and compared to the design based on the current standards, the floor slab has a wider fulcrum space, a thinner floor slab, and less reinforcing bars in the direction perpendicular to the main bars. The damage to the RC slab of the steel bridge is significant.
【0008】これら、鋼橋のRC床版の損傷に対し有効
な補強工法として、床版上面増厚工事が行われている。[0008] As an effective reinforcing method for the damage of the RC floor slab of the steel bridge, thickening work on the floor slab is performed.
【0009】東名高速道路では、床版上面増厚工事を、
例えば、9日間連続して昼夜1車線の交通規制をして集
中的に施工を行うため、超速硬セメントなどを使用し、
練り混ぜをはじめとする材料供給を含む全ての作業を交
通規制内の道路本線上で実施している。On the Tomei Expressway, the floor slab top thickening work
For example, ultra-fast cement is used to control traffic in one lane day and night for 9 consecutive days and to carry out intensive construction.
All the work including material supply including kneading is carried out on the main road within the traffic regulations.
【0010】しかしながら、従来の超速硬セメントは、
練り上がりコンクリートのスランプロスが大きく、ま
た、硬化体を形成する水和物の生成が早いため、既設の
床版コンクリートとの付着強度が十分に得られない等の
課題があった。However, the conventional ultra-rapid setting cement is
Since the slump loss of the kneaded concrete is large and the hydrate forming the hardened body is generated quickly, there are problems such as not being able to obtain sufficient adhesion strength with the existing floor slab concrete.
【0011】さらに、従来の超速硬セメントを使用した
場合、超速硬コンクリートの硬化体にひび割れが発生す
る等の課題があった。Further, when the conventional ultra-rapid hardening cement is used, there is a problem that cracks occur in the hardened body of the ultra-rapid hardening concrete.
【0012】本発明者は、このような現状に鑑み種々検
討した結果、特定の材料を使用することにより、作業時
間が確保され、十分な振動締固め作業が可能となり、高
付着強度でひび割れ抵抗性の高い打継ぎ補修工事用の超
速硬コンクリートの製造が可能であるとの知見を得て本
発明を完成するに至った。The present inventor has conducted various studies in view of the above situation, and as a result, by using a specific material, working time can be secured, sufficient vibration compaction work can be performed, and high adhesion strength and crack resistance can be obtained. The present invention has been completed based on the knowledge that it is possible to manufacture super-fast-hardening concrete for highly reliable splice repair work.
【0013】[0013]
【課題を解決するための手段】即ち、本発明は、セメン
ト、非晶質カルシウムアルミネート、セッコウ類、及び
凝結調整剤を含有する超速硬セメントと、骨材と、必要
に応じ鋼繊維とを配合してなる打継ぎ補修工事用の超速
硬コンクリート組成物であり、該超速硬コンクリート組
成物と水とを混合してなる打継ぎ補修工事用の超速硬コ
ンクリートの製造方法である。That is, the present invention provides a cement, an amorphous calcium aluminate, gypsum, and a super-rapid-hardening cement containing a setting modifier, an aggregate, and optionally a steel fiber. A method for producing an ultra-rapid hardening concrete composition for splicing repair work, which is a mixture, and is a mixture of the ultra-rapid hardening concrete composition and water.
【0014】以下、本発明を詳しく説明する。The present invention will be described in detail below.
【0015】本発明では、セメント、非晶質カルシウム
アルミネート、セッコウ類、及び凝結調整剤を含有する
超速硬セメントと、骨材と、必要に応じ鋼繊維とを配合
してなる打継ぎ補修工事用の超速硬コンクリート組成物
を用いる。According to the present invention, a splice repair work is carried out in which cement, amorphous calcium aluminate, gypsum, and a super-rapid-hardening cement containing a setting modifier, an aggregate, and a steel fiber are blended. The ultra-quick concrete composition for use is used.
【0016】ここで超速硬セメントとは、急硬セメント
と凝結調整剤を配合するものであり、急硬セメントと
は、セメントと急硬成分を含有するものであり、急硬成
分とは、非晶質カルシウムアルミネートとセッコウ類か
らなるものである。Here, the ultra-rapid cement is a mixture of a rapid hardening cement and a setting modifier, the rapid hardening cement is a cement and a quick hardening component, and the rapid hardening component is a non-hardening component. It is composed of crystalline calcium aluminate and gypsum.
【0017】本発明で使用するセメントとしては、普
通、早強、又は超早強等の各種ポルトランドセメント、
これらポルトランドセメントに高炉スラグ等のシリカ質
を混合した各種混合セメント等が使用可能であり、これ
らのうち早強ポルトランドセメントの使用が好ましい。As the cement used in the present invention, various portland cements such as normal, early strength or ultra-early strength,
It is possible to use various mixed cements obtained by mixing these Portland cements with siliceous material such as blast furnace slag, and of these, it is preferable to use early-strength Portland cements.
【0018】本発明で使用する非晶質カルシウムアルミ
ネート(以下A−CAという)とは、生石灰等のCaO原料
と、ボーキサイト等のAl2O3原料を溶融して生成するも
ので、具体的には、12CaO・7Al2O3、3CaO・Al2O3、又はCa
O・Al2O3等に対応する鉱物を主成分とする非晶質の鉱物
が挙げられる。A−CAのうちでも、初期強度発現性が
優れていることから、12CaO・7Al2O3を主成分とするもの
や、CaO・Al2O3を主成分とするものが好ましい。A−C
Aの粉末度は、ブレーン値で3,000cm2/g以上が好まし
く、4,000〜8,000cm2/gがより好ましい。3,000cm2/g未
満では、急硬性が、特に、初期強度の発現性が悪くなる
場合がある。The amorphous calcium aluminate (hereinafter referred to as A-CA) used in the present invention is produced by melting a CaO raw material such as quicklime and an Al 2 O 3 raw material such as bauxite. Includes 12CaO.7Al 2 O 3 , 3CaO.Al 2 O 3 , or Ca.
Amorphous minerals whose main component is a mineral corresponding to O · Al 2 O 3 etc. can be mentioned. Among A-CAs, those having 12CaO · 7Al 2 O 3 as a main component and those having CaO · Al 2 O 3 as a main component are preferable because they have excellent initial strength development. AC
The Blaine value of the fineness of A is preferably 3,000 cm 2 / g or more, more preferably 4,000 to 8,000 cm 2 / g. If it is less than 3,000 cm 2 / g, the rapid hardening property, especially the initial strength may deteriorate.
【0019】本発明で使用するセッコウ類としては、各
種セッコウ、例えば、無水、半水、及び二水の各種セッ
コウの一種又は二種以上が使用可能である。このうち、
II型の無水セッコウの使用は強度発現性の面から最も好
ましい。セッコウ類の粉末度は、ブレーン値で4,000cm2
/g以上が好ましく、5,000〜9,000cm2/gが高強度発現性
の面からより好ましい。4,000cm2/g未満では初期強度発
現性が悪くなる場合があり、また、硬化後の膨張が大き
くなる場合もある。セッコウ類の使用量は、A−CA10
0重量部に対して、50〜300重量部が好ましく、80〜150
重量部がより好ましい。50重量部未満では作業時間が確
保できず、300重量部を超えると、急硬性が、特に、初
期強度の発現性が悪くなる場合、例えば、コンクリート
において3時間で240kgf/cm2以上の強度が得にくい場合
がある。As the gypsum used in the present invention, various types of gypsum, for example, one type or two or more types of various types of gypsum such as anhydrous, half-water and dihydrate can be used. this house,
The use of type II anhydrous gypsum is most preferable from the viewpoint of strength development. The fineness of gypsum is 4,000 cm 2 in terms of Blaine value.
/ g or more is preferable, and 5,000 to 9,000 cm 2 / g is more preferable from the viewpoint of high strength development. If it is less than 4,000 cm 2 / g, the initial strength development may be poor, and the expansion after curing may be large. The amount of gypsum used is A-CA10.
0 to 50 parts by weight, preferably 50 to 300 parts by weight, 80 to 150
More preferably parts by weight. If it is less than 50 parts by weight, the working time cannot be secured, and if it exceeds 300 parts by weight, the rapid hardening property, particularly when the initial strength is poorly developed, for example, in concrete, strength of 240 kgf / cm 2 or more in 3 hours is obtained. It may be difficult to obtain.
【0020】本発明では、A−CAとセッコウ類を急硬
成分として使用する。急硬成分の使用量は、セメントと
急硬成分からなる急硬セメント100重量部中、5〜50重
量部が好ましく、20〜30重量部がより好ましい。急硬成
分が5重量部未満では強度が不足し、50重量部を超える
と作業時間が極端に短縮される場合がある。In the present invention, A-CA and gypsum are used as a rapid hardening component. The amount of the rapid hardening component used is preferably 5 to 50 parts by weight, and more preferably 20 to 30 parts by weight, in 100 parts by weight of the rapid hardening cement composed of cement and the rapid hardening component. If the rapid hardening component is less than 5 parts by weight, the strength is insufficient, and if it exceeds 50 parts by weight, the working time may be extremely shortened.
【0021】本発明で使用する凝結調整剤としては、ク
エン酸、グルコン酸、酒石酸、及びリンゴ酸等のオキシ
カルボン酸又はそれらのナトリウム、カリウム、及びカ
ルシウム塩等の水溶性塩であり、これらの二種以上を併
用することは好ましい。凝結調整剤の使用量は、超速硬
セメント100重量部中、0.05〜1.5重量部であり、0.1〜
1.0重量部が好ましい。0.05重量部未満では瞬結して振
動締固めに必要な作業時間がとれず、1.50重量部を超え
ると作業時間が長すぎ、初期強度の発現も悪くなる場合
がある。The setting regulator used in the present invention is an oxycarboxylic acid such as citric acid, gluconic acid, tartaric acid and malic acid, or a water-soluble salt thereof such as sodium, potassium and calcium salts. It is preferable to use two or more kinds in combination. The use amount of the setting modifier is 0.05 to 1.5 parts by weight in 100 parts by weight of ultra-rapid cement, and 0.1 to
1.0 part by weight is preferred. If the amount is less than 0.05 parts by weight, the work may be instantaneously performed and the working time required for vibration compaction cannot be obtained. If the amount exceeds 1.50 parts by weight, the working time may be too long and the initial strength may be deteriorated.
【0022】本発明で使用する骨材としては、川砂や川
砂利の他、砕砂や砕石等の天然の骨材が挙げられ、その
うち標準粒度範囲に入る骨材の使用が好ましい。粗骨材
の最大寸法は、強度向上、乾燥収縮量の低減、及び振動
締固め時の作業性等を考慮して、20〜25mmが好ましい。Examples of aggregates used in the present invention include natural aggregates such as crushed sand and crushed stone, as well as river sand and river gravel, and of these, it is preferable to use aggregates within the standard particle size range. The maximum size of the coarse aggregate is preferably 20 to 25 mm in consideration of strength improvement, reduction of drying shrinkage, workability during vibration compaction, and the like.
【0023】本発明に使用する鋼繊維としては、特に限
定されるものではないが、例えば、土木学会規準「コン
クリート用鋼繊維」に適合した鋼繊維を使用する。長さ
は20〜60mmのものの使用が好ましい。鋼繊維の使用量
は、超速硬コンクリート組成物100容積部中、1.0〜1.5
容積部が好ましい。1.0容積部未満では、鋼繊維の混入
効果がなく、1.5容積部を超えると作業性が悪くなる場
合がある。The steel fiber used in the present invention is not particularly limited, but for example, a steel fiber conforming to the standards of the Japan Society of Civil Engineers "steel fiber for concrete" is used. It is preferable to use one having a length of 20 to 60 mm. The amount of steel fiber used is 1.0 to 1.5 in 100 parts by volume of the ultra-rapid concrete composition.
Volume parts are preferred. If it is less than 1.0 part by volume, there is no effect of mixing steel fibers, and if it exceeds 1.5 part by volume, workability may deteriorate.
【0024】各材料の混合方法は、安定した品質の超速
硬コンクリートを、中断することなく、連続で、一定し
た練混ぜ速度で供給できれば、特に、限定されるもので
はなく、連続式やバッチ式のいずれの混合方法も可能で
ある。例えば、超速硬セメント、砂、砂利、及び必要に
応じ鋼繊維を連続供給し、スクリュー型オーガーで練り
混ぜる方法や、現場バッチ式ミキサで、超速硬セメン
ト、砂、砂利、及び必要に応じ鋼繊維を練り混ぜる方法
などが可能である。また、各材料を同時に混合すること
も可能であり、凝結調整剤を別に添加することも可能で
ある。打設方法や養生方法は、特に限定されるものでは
なく、通常の方法が可能である。The mixing method of each material is not particularly limited as long as it is possible to supply stable quality ultra-fast hardening concrete continuously without interruption and at a constant kneading speed. Any of the above mixing methods is possible. For example, a method of continuously supplying ultra-rapid hardening cement, sand, gravel, and steel fiber as needed, and kneading with a screw-type auger, or an on-site batch mixer, ultra-rapid hardening cement, sand, gravel, and steel fiber as needed. The method of kneading and mixing is possible. Further, it is possible to mix the respective materials at the same time, and it is also possible to add the coagulation modifier separately. The driving method and curing method are not particularly limited, and ordinary methods can be used.
【0025】[0025]
【実施例】以下、本発明を実施例によってさらに詳しく
説明する。EXAMPLES The present invention will be described in more detail below with reference to examples.
【0026】実施例1 CaO原料とAl2O3原料を電気炉で溶融後、急冷して得られ
たCaO・Al2O3クリンカーをポットミルで、ブレーン値5,0
00cm2/gに粉砕してCaO・Al2O3のA−CAを調製した。調
製したA−CA100重量部とセッコウ類100重量部を混合
して得た急硬成分を、セメントと急硬成分との合計100
重量部に対して、表1に示すように混合して急硬セメン
トを調製した。この急硬セメント96.9重量部と、炭酸カ
リウム2.5重量部、クエン酸0.4重量部、及びグルコン酸
ナトリウム0.2重量部からなる凝結調整剤とを混合し、
超速硬セメントを調製した。この超速硬セメント100重
量部に、細骨材150重量部と水35重量部配合し、ASTMC30
5 の規定のモルタルミキサで練り混ぜ、20℃恒温室で凝
結時間と圧縮強度を測定した。結果を表1に併記する。Example 1 A CaO / Al 2 O 3 clinker obtained by melting a CaO raw material and an Al 2 O 3 raw material in an electric furnace and then rapidly cooling the mixture in a pot mill with a Blaine value of 5,0.
It was crushed to 00 cm 2 / g to prepare A-CA of CaO · Al 2 O 3 . A mixture of 100 parts by weight of the prepared A-CA and 100 parts by weight of gypsum was added to obtain a quick-hardening component, and the total of cement and the quick-hardening component was 100.
A rapid hardening cement was prepared by mixing as shown in Table 1 with respect to parts by weight. Mixing 96.9 parts by weight of this quick-hardening cement, 2.5 parts by weight of potassium carbonate, 0.4 parts by weight of citric acid, and a setting regulator composed of 0.2 parts by weight of sodium gluconate,
An ultra-rapid cement was prepared. To 100 parts by weight of this super-hardening cement, 150 parts by weight of fine aggregate and 35 parts by weight of water are mixed, and ASTM C30
The mixture was kneaded with a mortar mixer stipulated in 5 and the setting time and compressive strength were measured in a constant temperature room at 20 ° C. The results are also shown in Table 1.
【0027】<使用材料> セメント :電気化学工業社製、早強ポルトランドセメ
ント、比重3.12 CaO原料 :市販生石灰 Al2O3原料 :市販ボーキサイト セッコウ類:II型無水セッコウ、市販品、ブレーン値6,
000cm2/g、比重2.90 炭酸カリウム:和光純薬工業社製、試薬1級 クエン酸 :和光純薬工業社製、試薬1級 グルコン酸ナトリウム:和光純薬工業社製、試薬1級 細骨材 :新潟県姫川産川砂、比重2.63<Materials used> Cement: High-strength Portland cement manufactured by Denki Kagaku Kogyo Co., Ltd., specific gravity 3.12 CaO raw material: Commercial quicklime Al 2 O 3 raw material: Commercial bauxite gypsum: Type II anhydrous gypsum, commercial product, Blaine value 6,
000cm 2 / g, specific gravity 2.90 Potassium carbonate: Wako Pure Chemical Industries, Ltd., reagent grade 1 citric acid: Wako Pure Chemical Industries Ltd, reagent grade 1 Sodium gluconate: Wako Pure Chemical Industries Ltd, reagent grade 1 Fine aggregate : Niigata Prefecture Himekawa river sand, specific gravity 2.63
【0028】<試験方法> 凝結時間 :20℃の恒温室でASTM C403 に準じて測定 圧縮強度 :4×4×16cmの供試体の注水2時間後の圧
縮強度を、JIS R 5201に準じて測定<Test method> Setting time: Measured according to ASTM C403 in a thermostatic chamber at 20 ° C. Compressive strength: Measured the compressive strength of a 4 × 4 × 16 cm test piece 2 hours after water injection according to JIS R 5201.
【0029】[0029]
【表1】 [Table 1]
【0030】実施例2 急硬セメント100重量部中の急硬成分を30重量部とし、
急硬成分中のA−CA100重量部に対するセッコウ類の
割合を表2に示すように配合したこと以外は実施例1と
同様に行った。結果を表2に併記する。Example 2 30 parts by weight of the rapid-hardening component in 100 parts by weight of the rapid-hardening cement,
Example 1 was carried out in the same manner as in Example 1 except that the ratio of gypsum to 100 parts by weight of A-CA in the rapid hardening component was compounded as shown in Table 2. The results are also shown in Table 2.
【0031】[0031]
【表2】 [Table 2]
【0032】実施例3 急硬セメント100重量部中の急硬成分の配合量を30重量
部として、凝結調整剤としてクエン酸を表3に示すよう
に配合したこと以外は実施例1と同様に行った。結果を
表3に併記する。Example 3 The same as Example 1 except that the compounding amount of the rapid hardening component in 100 parts by weight of the rapid hardening cement was 30 parts by weight, and citric acid as the setting modifier was mixed as shown in Table 3. went. The results are also shown in Table 3.
【0033】[0033]
【表3】 [Table 3]
【0034】実施例4 急硬セメント100重量部中の急硬成分を30重量部とし、
この急硬セメント96.9重量部と、炭酸カリウム2.5重量
部、クエン酸0.4重量部、及びグルコン酸ナトリウム0.2
重量部からなる凝結調製剤とを混合し、超速硬セメント
を調製した。この超速硬セメントを用いて、W/C=37
%、s/a=55%で、表4に示す配合のコンクリートを
調製し、圧縮強度と付着強度を測定した。結果を表4に
併記する。同様に調製したコンクリートを打設し、3日
後にその表面のひび割れの有無を観察した。結果を表4
に併記する。Example 4 30 parts by weight of the rapid-hardening component in 100 parts by weight of the rapid-hardening cement,
96.9 parts by weight of this rapid hardening cement, 2.5 parts by weight of potassium carbonate, 0.4 parts by weight of citric acid, and 0.2 parts of sodium gluconate.
An ultrafast cement was prepared by mixing with a setting agent consisting of parts by weight. Using this ultra-rapid cement, W / C = 37
%, S / a = 55%, concrete with the composition shown in Table 4 was prepared, and the compressive strength and the adhesive strength were measured. The results are also shown in Table 4. Concrete prepared in the same manner was poured, and after 3 days, the presence or absence of cracks on the surface was observed. Table 4 shows the results
Also described in.
【0035】<使用材料> 粗骨材 :新潟県姫川産川砂利、Gmax=25mm、比重2.
66 鋼繊維 :市販品、φ0.6×30mm、比重7.85<Materials used> Coarse aggregate: River gravel from Himekawa, Niigata Prefecture, Gmax = 25mm, specific gravity 2.
66 Steel fiber: Commercial product, φ0.6 × 30mm, specific gravity 7.85
【0036】<試験方法> 圧縮強度 :φ10×20cmの供試体を用い、20℃の封緘養
生3時間後、JIS A 1108に準じて測定 付着強度 :建研式付着試験機を使用し、φ10×6cmの
供試体で7日後測定<Test method> Compressive strength: Using a test piece of φ10 × 20 cm, measured in accordance with JIS A 1108 after 3 hours of sealing and curing at 20 ° C. Adhesive strength: φ10 × using a Kenken-type adhesion tester Measured after 7 days with a 6 cm specimen
【0037】[0037]
【表4】 [Table 4]
【0038】[0038]
【発明の効果】本発明により、作業時間が確保されるた
めに十分な振動締固め作業が可能となり、高付着強度で
ひび割れ抵抗性の高い打継ぎ補修工事用の超速硬コンク
リートを製造することができた。EFFECTS OF THE INVENTION According to the present invention, it is possible to perform a sufficient vibration compaction work to secure a working time, and to manufacture a super-rapid hardening concrete for a splice repair work which has high adhesion strength and high crack resistance. did it.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 C04B 14:48 24:06) 103:00 111:72 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location C04B 14:48 24:06) 103: 00 111: 72
Claims (3)
ト、セッコウ類、及び凝結調整剤を含有する超速硬セメ
ントと骨材を配合してなる打継ぎ補修工事用の超速硬コ
ンクリート組成物。1. A super quick-hardening concrete composition for splicing repair work, which is prepared by mixing an aggregate with a super fast-hardening cement containing cement, amorphous calcium aluminate, gypsum, and a setting modifier.
ト、セッコウ類、及び凝結調整剤を含有する超速硬セメ
ントと、骨材と、鋼繊維とを配合してなる打継ぎ補修工
事用の超速硬コンクリート組成物。2. Ultra-quick-setting concrete for splicing repair work, which is obtained by mixing cement, amorphous calcium aluminate, gypsum, and ultra-quick-setting cement containing a setting modifier, aggregate, and steel fiber. Composition.
ト組成物と水とを混合してなる打継ぎ補修工事用の超速
硬コンクリートの製造方法。3. A method for producing an ultra-rapid hardening concrete for splice repair work, which comprises mixing the ultra-rapid hardening concrete composition according to claim 1 and water with water.
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JP8037595A JP3549609B2 (en) | 1995-04-05 | 1995-04-05 | Super-hard concrete composition for joint repair work and method for producing super-hard concrete using the same |
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JP8037595A JP3549609B2 (en) | 1995-04-05 | 1995-04-05 | Super-hard concrete composition for joint repair work and method for producing super-hard concrete using the same |
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JPH08277156A true JPH08277156A (en) | 1996-10-22 |
JP3549609B2 JP3549609B2 (en) | 2004-08-04 |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0948648A (en) * | 1995-08-07 | 1997-02-18 | Sumitomo Metal Mining Co Ltd | Repairing mortar |
WO1999054264A1 (en) * | 1998-04-17 | 1999-10-28 | New Tokyo International Airport Authority | Concrete for jointing and method of jointing using said concrete |
WO1999055635A1 (en) * | 1998-04-28 | 1999-11-04 | New Tokyo International Airport Authority | Concrete composition for overlay method and hardened product therefrom |
KR20000006739A (en) * | 1999-10-25 | 2000-02-07 | 박정환 | Production method of concrete using iron core |
JP2006273700A (en) * | 2005-03-30 | 2006-10-12 | Sumitomo Osaka Cement Co Ltd | Flowability improving method of super-quick hardening concrete and flowability improving agent for super-quick hardening concrete |
JP2007320835A (en) * | 2006-06-05 | 2007-12-13 | Denki Kagaku Kogyo Kk | Extra-quick hardening cement composition, extra-quick hardening cement concrete composition, and extra-quick hardening cement concrete |
JP2007320834A (en) * | 2006-06-05 | 2007-12-13 | Denki Kagaku Kogyo Kk | Ultra rapid hardening cement composition, ultra rapid hardening cement concrete composition and ultra rapid hardening cement concrete |
JP2015107893A (en) * | 2013-12-05 | 2015-06-11 | 株式会社トクヤマエムテック | Concrete composition |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN107459327A (en) * | 2017-08-03 | 2017-12-12 | 长安大学 | Suitable for low temperature or the fast repairing concrete material of construction in minus-temperature environment |
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1995
- 1995-04-05 JP JP8037595A patent/JP3549609B2/en not_active Expired - Lifetime
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0948648A (en) * | 1995-08-07 | 1997-02-18 | Sumitomo Metal Mining Co Ltd | Repairing mortar |
WO1999054264A1 (en) * | 1998-04-17 | 1999-10-28 | New Tokyo International Airport Authority | Concrete for jointing and method of jointing using said concrete |
US6357963B1 (en) | 1998-04-17 | 2002-03-19 | New Tokyo International Airport Authority | Concrete for jointing and method of jointing using said concrete |
WO1999055635A1 (en) * | 1998-04-28 | 1999-11-04 | New Tokyo International Airport Authority | Concrete composition for overlay method and hardened product therefrom |
US6372038B1 (en) | 1998-04-28 | 2002-04-16 | New Tokyo International Airport Authority | Concrete composition for overlay method and hardened product therefrom |
KR20000006739A (en) * | 1999-10-25 | 2000-02-07 | 박정환 | Production method of concrete using iron core |
JP2006273700A (en) * | 2005-03-30 | 2006-10-12 | Sumitomo Osaka Cement Co Ltd | Flowability improving method of super-quick hardening concrete and flowability improving agent for super-quick hardening concrete |
JP4583220B2 (en) * | 2005-03-30 | 2010-11-17 | 住友大阪セメント株式会社 | Method for improving fluidity of ultrafast hard concrete and fluidity improver for ultrafast concrete |
JP2007320835A (en) * | 2006-06-05 | 2007-12-13 | Denki Kagaku Kogyo Kk | Extra-quick hardening cement composition, extra-quick hardening cement concrete composition, and extra-quick hardening cement concrete |
JP2007320834A (en) * | 2006-06-05 | 2007-12-13 | Denki Kagaku Kogyo Kk | Ultra rapid hardening cement composition, ultra rapid hardening cement concrete composition and ultra rapid hardening cement concrete |
JP2015107893A (en) * | 2013-12-05 | 2015-06-11 | 株式会社トクヤマエムテック | Concrete composition |
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