JPH05319887A - Concrete composition - Google Patents
Concrete compositionInfo
- Publication number
- JPH05319887A JPH05319887A JP13055592A JP13055592A JPH05319887A JP H05319887 A JPH05319887 A JP H05319887A JP 13055592 A JP13055592 A JP 13055592A JP 13055592 A JP13055592 A JP 13055592A JP H05319887 A JPH05319887 A JP H05319887A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- amount
- concrete
- concrete composition
- bentonite
- 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
- 239000000203 mixture Substances 0.000 title claims abstract description 35
- 239000004568 cement Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910001868 water Inorganic materials 0.000 claims abstract description 27
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 19
- 239000000440 bentonite Substances 0.000 claims abstract description 18
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 6
- 238000005056 compaction Methods 0.000 abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 7
- 239000000377 silicon dioxide Substances 0.000 abstract description 3
- 230000002542 deteriorative effect Effects 0.000 abstract 1
- 230000000979 retarding effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- 239000000463 material Substances 0.000 description 12
- 238000000926 separation method Methods 0.000 description 9
- 230000029058 respiratory gaseous exchange Effects 0.000 description 7
- 238000001723 curing Methods 0.000 description 6
- 229910021487 silica fume Inorganic materials 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000004575 stone Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- WURBVZBTWMNKQT-UHFFFAOYSA-N 1-(4-chlorophenoxy)-3,3-dimethyl-1-(1,2,4-triazol-1-yl)butan-2-one Chemical compound C1=NC=NN1C(C(=O)C(C)(C)C)OC1=CC=C(Cl)C=C1 WURBVZBTWMNKQT-UHFFFAOYSA-N 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 238000009415 formwork Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 239000002562 thickening agent Substances 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- 241000356114 Trachytes Species 0.000 description 1
- 239000012190 activator Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical group O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- 239000000025 natural resin Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- IIACRCGMVDHOTQ-UHFFFAOYSA-N sulfamic acid Chemical compound NS(O)(=O)=O IIACRCGMVDHOTQ-UHFFFAOYSA-N 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- -1 triazine compound Chemical class 0.000 description 1
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
- 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
Landscapes
- 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、軟練りコンクリートを
用いてコンクリート製品を打設、成形する際に、振動締
め固め等の操作を不要にすることができる良好な流動性
を有する新規なコンクリート組成物に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel concrete having good fluidity which makes it unnecessary to perform operations such as vibration compaction when pouring and molding concrete products using soft concrete. It relates to a composition.
【０００２】[0002]
【従来の技術】従来より行われているコンクリート製品
の製造方法は、製品型枠を外部振動機により振動させな
がら混練したコンクリート組成物を投入してコンクリー
ト製品を製造したり、製品型枠にコンクリート組成物を
投入して内部振動機を用いて振動締め固めによりコンク
リート製品を得るというものである。振動締め固めによ
りコンクリート製品を製造する際には、振動機と型枠と
により相当広い範囲にわたり騒音をもたらし環境問題と
なっている。また、振動機による締め固めにより型枠自
体の傷みも大きくなり償却年数が短縮されている。ま
た、コンクリートの面から言えば振動機を用いて振動締
め固めをすることにより、ブリージング水の発生やコン
クリート中のセメントペーストと骨材との分離や粗骨材
の沈降等が起こる。2. Description of the Related Art Conventional methods for producing concrete products include the production of concrete products by adding a kneaded concrete composition while vibrating the product form with an external vibrator, or producing concrete products in the product form. The concrete product is obtained by charging the composition and vibration compaction using an internal vibrator. When a concrete product is manufactured by vibration compaction, the vibrator and the mold form cause noise over a considerably wide range, which is an environmental problem. In addition, the compaction by the vibrator also causes the damage to the form itself and shortens the amortization period. In terms of concrete, vibration compaction using a vibrator causes generation of breathing water, separation of cement paste and aggregate in concrete, and sedimentation of coarse aggregate.
【０００３】[0003]
【発明が解決しようとする課題】このような問題を解決
するために、軟練りコンクリートを用いて製品を製造す
る際に、振動締め固めを不要にし、製品を製造する作業
性を良好に保ちつつブリージング水の発生を抑制し、コ
ンクリートの材料分離を防止するようにしたコンクリー
ト混和材及び混和剤を配合して振動締め固めをせずにコ
ンクリート製品を得ることができるコンクリート組成物
が提唱されている。In order to solve such a problem, when a product is manufactured by using soft concrete, vibration compaction is not required and the workability of manufacturing the product is kept good. A concrete composition has been proposed in which concrete admixtures and admixtures that suppress the generation of breathing water and prevent the separation of concrete materials are mixed to obtain concrete products without vibration compaction. ..
【０００４】例えば、高流動性コンクリート組成物とし
てセルロース系増粘剤(例えばＭＣ：メチルセルロース
系)を配合したものが提唱されている。しかし、セルロ
ース系の増粘剤を配合した高流動性コンクリート組成物
は、凝結遅延を起こしたり、強度発現性が低下すること
が報告されている。そのため、コンクリート打設後の工
程に影響を及ぼす場合があり、特に例えばコンクリート
製品の製造においては型枠の脱型が遅れるため作業工程
に支障を来すことがあった。For example, as a high fluidity concrete composition, a composition in which a cellulosic thickener (for example, MC: methylcellulose) is blended has been proposed. However, it has been reported that a high-fluidity concrete composition containing a cellulosic thickener causes a delay in setting and a decrease in strength development. Therefore, it may affect the process after the concrete is placed, and in particular, for example, in the production of concrete products, the demolding of the formwork is delayed, which may hinder the work process.
【０００５】従って、本発明の目的は、振動締め固め等
の操作を不要にすることができる良好な流動性を有し、
凝結遅延や強度発現性の低下を生ずることがない新規な
コンクリート組成物を提供することにある。Therefore, an object of the present invention is to have good fluidity which makes it unnecessary to perform operations such as vibration compaction,
It is an object of the present invention to provide a novel concrete composition which does not cause delay in setting or reduction in strength development.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明に係るコン
クリート組成物は、セメント、骨材、高性能減水剤、超
微粉珪酸、ベントナイト及び水を含有してなるコンクリ
ート組成物であって、単位セメント量３５０〜５００ｋ
ｇ／ｍ3、セメント量に対する高性能減水剤量が０.５〜
５.０重量％であり、超微粉珪酸量が０.１〜５.０重量
％であり、ベントナイト量が０.５〜１０.０重量％であ
り、かつ混練して得られる生コンクリートのスランプが
２２ｃｍ以上であり、スランプフローが５０〜７０ｃｍ
であることを特徴とする。That is, a concrete composition according to the present invention is a concrete composition containing cement, an aggregate, a high-performance water reducing agent, ultrafine silicic acid, bentonite and water. Cement amount 350-500k
g / m 3 , the amount of high-performance water reducing agent is 0.5 to the amount of cement
It is 5.0% by weight, the amount of ultrafine silicic acid is 0.1 to 5.0% by weight, the amount of bentonite is 0.5 to 10.0% by weight, and the slump of green concrete obtained by kneading. Is 22 cm or more, and the slump flow is 50 to 70 cm
Is characterized in that
【０００７】また、本発明に係るコンクリート組成物
は、空気連行剤を含有するものであってもよい。The concrete composition according to the present invention may contain an air entraining agent.
【０００８】[0008]
【作用】本発明に係るコンクリート組成物は、水に接し
て膨潤するベントナイトを特定量配合するものであり、
凝結時間や強度発現性に悪影響を及ぼすことなく、コン
クリート製品の製造にも好適に使用できるものである。The concrete composition according to the present invention contains a specific amount of bentonite which swells in contact with water.
It can be preferably used for the production of concrete products without adversely affecting the setting time and strength development.
【０００９】以下、本発明を更に説明する。本発明に使
用するセメントは特に限定されるものではなく、普通、
早強、超早強などのポルトライドセメント、あるいは高
炉セメント、フライアッシュセメント、シリカセメント
等の混合セメントのいずれでもよい。なお、本発明のコ
ンクリート組成物における単位セメント量は３５０〜５
００ｋｇ／ｍ3、好ましくは３８０〜４８０ｋｇ／ｍ3の
範囲内である。単位セメント量が３５０ｋｇ／ｍ3未満
では分離のない流動性を得るためのペースト量が不足す
るために好ましくなく、また、５００ｋｇ／ｍ3を超え
ると硬化体の乾燥収縮が多くなるために好ましくない。The present invention will be further described below. Cement used in the present invention is not particularly limited, usually,
It may be any of portolide cement such as early strength and ultra early strength, or mixed cement such as blast furnace cement, fly ash cement and silica cement. In addition, the amount of unit cement in the concrete composition of the present invention is 350 to 5
It is within the range of 00 kg / m 3 , preferably 380 to 480 kg / m 3 . When the unit cement amount is less than 350 kg / m 3, it is not preferable because the amount of paste for obtaining fluidity without separation is insufficient, and when it exceeds 500 kg / m 3 , drying shrinkage of the hardened body increases, which is not preferable. ..
【００１０】本発明のコンクリート組成物の配合は、目
標とする組成物及び使用材料等により、常法により適宜
選択すればよいが、粗骨材の最大寸法は２０〜３０ｍ
ｍ、水／セメント比は０.３〜０.５、好ましくは０.３
５〜０.４５、細骨材率は４５〜５５％、好ましくは４
７〜５２％の範囲であり、常法により設計すればよい。The composition of the concrete composition of the present invention may be appropriately selected by a conventional method depending on the target composition and the materials used, but the maximum size of the coarse aggregate is 20 to 30 m.
m, water / cement ratio of 0.3 to 0.5, preferably 0.3.
5 to 0.45, fine aggregate ratio is 45 to 55%, preferably 4
It is in the range of 7 to 52% and may be designed by a conventional method.
【００１１】更に、本発明のコンクリート組成物に用い
られる高性能減水剤は市販されているもので良く、特に
限定されない。例えば、高性能減水剤としては花王社製
マイティ１５０(商品名：主成分＝ナフタレンスルホン
酸ホルマリン高縮合物塩)、花王社製マイティ２０００
ＷＨ(商品名：主成分＝アニオン型特殊高分子活性剤)、
日曹マスタービルダーズ社製ポリゾスＮＬ−４０００
(商品名：主成分＝高縮合トリアジン系化合物)、藤沢薬
品工業社製パリックＦＰ２００Ｈ(商品名：主成分＝芳
香族アミノスルホン酸系高分子化合物)等が挙げられ
る。Further, the high-performance water reducing agent used in the concrete composition of the present invention may be a commercially available product and is not particularly limited. For example, as a high-performance water reducing agent, Mighty 150 manufactured by Kao (trade name: Main component = Naphthalenesulfonic acid formalin highly condensed salt), Mighty 2000 manufactured by Kao
WH (trade name: main component = anionic special polymer activator),
Nisso Master Builders Polyzos NL-4000
(Brand name: main component = highly condensed triazine compound), Pasic FP200H manufactured by Fujisawa Pharmaceutical Co., Ltd. (Brand name: main component = aromatic aminosulfonic acid polymer compound), and the like.
【００１２】本発明のコンクリート組成物における高性
能減水剤の量はセメント量に対して０.５〜５重量％の
範囲内である。高性能減水剤の添加量がセメント量に対
して０.５重量％未満であると減水効果が小さく単位水
量が多くなり、ブリージングや材料分離などが認められ
る。また、高性能減水剤の添加量が５重量％を超えると
セメントの凝結時間が長くなることや、作業性が悪くな
る。The amount of the superplasticizer in the concrete composition of the present invention is in the range of 0.5 to 5% by weight based on the amount of cement. If the amount of the high-performance water reducing agent added is less than 0.5% by weight with respect to the amount of cement, the water reducing effect is small and the unit water amount increases, and breathing and material separation are recognized. If the amount of the high-performance water reducing agent added exceeds 5% by weight, the setting time of the cement will be long and the workability will be poor.
【００１３】本発明のコンクリート組成物には、更に、
特定された超微粉末と鉱物質膨潤材が配合される。ここ
で、超微粉末としては超微粉珪酸例えばフェロシリコン
製造時などにできる微粒子のシリカヒュームが好まし
い。また、鉱物質膨潤材は石英粗面岩及び同質凝灰岩等
が熱水作用や風化作用の結果生成したモンモリロナイト
鉱物を主成分としし、水中で著しく膨潤する粘土鉱物で
ある所謂市販のベントナイトが好ましい。The concrete composition of the present invention further comprises
The specified ultrafine powder and the mineral swelling material are blended. Here, as the ultrafine powder, ultrafine silicic acid, for example, silica fume which is fine particles produced at the time of producing ferrosilicon is preferable. Further, as the mineral swelling material, so-called commercially available bentonite, which is a clay mineral that mainly contains montmorillonite mineral produced as a result of hydrothermal action and weathering of quartz trachyte and homogeneous tuff, and is a clay mineral that swells remarkably in water is preferable.
【００１４】超微粉珪酸量は単位セメント量に対して
０.１〜５.０重量％の範囲が好ましい。超微粉珪酸量が
単位セメント量に対して０.１重量％未満では、ブリー
ジング水の発生が認められ、作業性が低下し、強度増大
の効果が十分でない。また、単位セメント量に対して
５.０％を超えるとコンクリート組成物中に微粒分が多
くなり、所定の流動性がでなくなる。The amount of ultrafine silicic acid is preferably in the range of 0.1 to 5.0% by weight with respect to the unit cement amount. When the amount of ultrafine silicic acid is less than 0.1% by weight with respect to the unit cement amount, breathing water is generated, workability is deteriorated, and the effect of increasing strength is not sufficient. On the other hand, if it exceeds 5.0% with respect to the unit amount of cement, the concrete composition will contain a large amount of fine particles and the predetermined fluidity will not be obtained.
【００１５】ベントナイト量は単位セメント量に対して
０.５〜１０重量％の範囲が好ましい。ここで、ベント
ナイト量がセメント量に対して０.５重量％未満では、
ブリージング水の発生が認められ、作業性が低下する。
また、単位セメント量に対して１０重量％を超えるとベ
ントナイトによる保水性が大きくなり流動性がなくなる
と共に強度低下が大きくなる。The amount of bentonite is preferably in the range of 0.5 to 10% by weight based on the unit amount of cement. Here, when the amount of bentonite is less than 0.5% by weight with respect to the amount of cement,
Occurrence of breathing water is recognized and workability is reduced.
Further, if it exceeds 10% by weight with respect to the unit cement amount, the water retention by the bentonite becomes large, the fluidity is lost and the strength is greatly reduced.
【００１６】また、本発明のコンクリート組成物には、
適宜空気連行剤を配合することができる。空気連行剤と
しては市販されているもの例えばミサワセラミックケミ
カル社製フォーミックス(商品名：主成分＝ロジン系特
殊変成樹脂)、山宗化学社製ウィンソル＃８００(商品
名：主成分＝天然樹脂酸塩特殊界面活性剤)等が挙げら
れる。空気連行剤量は常法により適宜選択すればよい。The concrete composition of the present invention also comprises
An air entraining agent can be appropriately added. Commercially available air entraining agents, such as Misawa Ceramic Chemical Co., Formix (product name: main component = rosin-based special modified resin), Yamasou Chemical Co., Winsol # 800 (product name: main component = natural resin acid) Salt special surfactant) and the like. The amount of the air entraining agent may be appropriately selected by a conventional method.
【００１７】本発明のコンクリート組成物は、上述のセ
メント、高性能減水剤、細骨材、粗骨材、超微粉珪酸、
ベントナイト及び混練り水を混合あるいは適宜空気連行
剤を混合して混練することにより得られる。混練方法は
特に限定されないが、通常比較的軟練りに用いられてい
る強制撹拌式ミキサーが良適である。The concrete composition of the present invention comprises the above-mentioned cement, high-performance water reducing agent, fine aggregate, coarse aggregate, ultrafine silicic acid,
It is obtained by mixing bentonite and kneading water or kneading by appropriately mixing an air entraining agent. The kneading method is not particularly limited, but a forced agitation mixer that is usually used for relatively kneading is suitable.
【００１８】このようにして得られる本発明のコンクリ
ート組成物は、スランプが２２ｃｍ以上であり、スラン
プフローが５０〜７０ｃｍの範囲内にある。ここで、ス
ランプが２２ｃｍ未満であると既に材料分離を起こして
いるために好ましくない。更に、スランプフローが５０
ｃｍ未満であると流動性が十分でないために好ましくな
く、また、７０ｃｍを超えると材料分離の傾向が見られ
るために好ましくない。The concrete composition of the present invention thus obtained has a slump of 22 cm or more and a slump flow of 50 to 70 cm. Here, if the slump is less than 22 cm, material separation has already occurred, which is not preferable. Furthermore, the slump flow is 50
If it is less than 70 cm, fluidity is not sufficient, which is not preferable, and if it exceeds 70 cm, material separation tends to occur, which is not preferable.
【００１９】上述のように、本発明のコンクリート組成
物は、含有する高性能減水剤、超微粉珪酸やベントナイ
ト並びに必要に応じて添加される空気連行剤との相乗効
果により、極めて高い流動性を有し、しかも材料分離が
起こらない。よって、この組成物を使用するに当たって
は、型枠の中に単に投入ないし流し込むだけで型枠のす
みずみまで均一に充填され、そして打設後ブリージング
の発生が見られない。従って、本発明のコンクリート組
成物をコンクリート製品の製造に使用した場合は、従来
必須の工程であった外部振動や内部振動による振動締め
固めをすることなしにコンクリート製品を成形すること
ができる。そして、従来法では行われていた振動締め固
めをすることなしに成形されたコンクリート製品は養生
すればよく、得られた製品は均一で強度等の物性に優れ
たものである。この養生方法は特に限定されず、水中養
生、蒸気養生等通常の養生方法によればよい。As described above, the concrete composition of the present invention has an extremely high fluidity due to the synergistic effect of the high-performance water reducing agent, ultrafine silicic acid and bentonite contained therein, and the air entraining agent added as necessary. And has no material separation. Therefore, when this composition is used, it is evenly poured or poured into the mold to evenly fill the mold evenly, and no breathing is observed after casting. Therefore, when the concrete composition of the present invention is used for producing a concrete product, the concrete product can be molded without vibration compaction due to external vibration or internal vibration, which has been conventionally required. Then, the concrete product molded without vibration compaction, which has been performed in the conventional method, may be cured, and the obtained product is uniform and has excellent physical properties such as strength. This curing method is not particularly limited, and may be an ordinary curing method such as underwater curing or steam curing.
【００２０】また、本発明のコンクリート組成物の使用
にあたり、振動締め固めを要しないので、振動機による
騒音がなくなり、型枠自体の傷みも小さく、償却年数を
長くすることができる。In addition, when the concrete composition of the present invention is used, vibration compaction is not required, so noise from a vibrator is eliminated, damage to the form itself is small, and the amortization period can be extended.
【００２１】[0021]
【実施例】以下、実施例及び比較例を示しながら詳細に
本発明を説明する。 実施例１ 普通ポルトランドセメントを４３０ｋｇ／ｍ3、小笠産
陸砂を８５６ｋｇ／ｍ3、岩瀬産砕石(最大寸法２０ｍ
ｍ)を８６６ｋｇ／ｍ3、高性能減水剤としてマイティ１
５０[花王(株)製]を７.９６ｋｇ／ｍ3、日本重化学工業
(株)製シリカヒュームを４.３ｋｇ／ｍ3、関東ベントナ
イト(株)製ベントナイトを７.７４ｋｇ／ｍ3及び混練水
を１７５ｋｇ／ｍ3混合し、９０秒間強制撹拌式ミキサ
ーで混練した。このコンクリートのスランプ、スランプ
フロー及び空気量を測定した。スランプフローの測定方
法は、スランプ試験後コンクリートの底面の最も長い直
径とそれに直角な方向の直径を測定した。それぞれの測
定結果は、２５.０ｃｍ、６０×６２ｃｍ、１.６％であ
った。また、混練物のブリージング率は０.１％であっ
た。この混練物を長さ３０ｃｍ、幅１０ｃｍ、高さ６０
ｃｍの角柱型枠に振動締め固めすることなしに投入して
成形した。成形後そのまま室内に２４時間放置し、脱型
後コンクリート側面の外観検査を行い、その後粗骨材の
沈下量の評価を行った。粗骨材の沈下量の評価は、粗骨
材の出石率を求め、供試体の上から５ｃｍと５５ｃｍの
ところで比較し、出石率比で表し評価した。出石率の算
出については、ある特定のコンクリート面の面積に占め
る粗骨材の面積の割合で示した。また、混練物の強度試
験用供試体として、１０ｃｍφ×２０ｃｍ円柱供試体型
枠に振動締め固めすることなしに投入、成形した。成形
後、室内に３時間放置し、蒸気養生を行った。その後、
気中養生を行い、７日強度及び２８日強度を測定した。EXAMPLES The present invention will be described in detail below with reference to Examples and Comparative Examples. Example 1 ordinary Portland cement and 430 kg / m 3, Ogasa production Rikusuna a 856kg / m 3, Iwase producing crushed stone (maximum dimension 20m
m) 866 kg / m 3 , Mighty 1 as a high-performance water reducing agent
50 [manufactured by Kao Corporation] 7.96 kg / m 3 , Nippon Heavy Industries
Ltd. silica fume to 4.3 kg / m 3, Kanto bentonite Co. bentonite 7.74kg / m 3 and mixing water 175 kg / m 3 were mixed and kneaded for 90 seconds forced stirring type mixer. The slump, slump flow, and air amount of this concrete were measured. The slump flow was measured by measuring the longest diameter of the bottom surface of the concrete and the diameter in the direction perpendicular thereto after the slump test. The respective measurement results were 25.0 cm, 60 × 62 cm and 1.6%. The breathing rate of the kneaded product was 0.1%. This kneaded product has a length of 30 cm, a width of 10 cm, and a height of 60.
It was put into a cm-shaped prismatic frame without being vibrationally compacted and molded. After molding, the molded product was left in the room as it was for 24 hours, and after demolding, the appearance of the side surface of the concrete was inspected and then the sinking amount of the coarse aggregate was evaluated. The settling amount of the coarse aggregate was evaluated by determining the stone extraction rate of the coarse aggregate, comparing it at 5 cm and 55 cm from the top of the specimen, and expressing it by the stone extraction rate ratio. The rate of stones was calculated by the ratio of the area of coarse aggregate to the area of a specific concrete surface. Further, as a test piece for strength test of the kneaded product, it was charged and molded in a 10 cmφ × 20 cm columnar test piece mold without vibration compaction. After molding, it was left in the room for 3 hours for steam curing. afterwards,
Air curing was performed, and 7-day strength and 28-day strength were measured.
【００２２】実施例２〜６ 実施例１と同一材料を用いて表１に示す量を配合し、実
施例１と同一に操作した。なお、表２には実施例１〜６
の測定結果を示す。Examples 2 to 6 The same materials as in Example 1 were used, the amounts shown in Table 1 were blended, and the same operation as in Example 1 was performed. In Table 2, Examples 1 to 6 are shown.
The measurement result of is shown.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【表２】 [Table 2]
【００２５】実施例７〜９ 実施例１と同一の材料及び空気連行剤を表３に示す量で
配合し、実施例１と同一に操作した。なお、表４には実
施例７〜９の測定結果を示す。Examples 7 to 9 The same materials and air entraining agent as in Example 1 were blended in the amounts shown in Table 3, and the same operation as in Example 1 was carried out. Table 4 shows the measurement results of Examples 7 to 9.
【００２６】[0026]
【表３】 [Table 3]
【００２７】[0027]
【表４】 [Table 4]
【００２８】比較例１〜６ 表５に示す配合割合で実施例１と同様に操作し、その測
定結果を表６に示す。ここで、比較例１は従来の土木用
コンクリート製品の代表的な配合例である。また、圧縮
強度試験用の供試体の作製にはテーブルバイブレータを
用い、１分間振動させて成形した。比較例２は比較例１
のコンクリートに高性能減水剤を過剰添加してスランプ
を２１ｃｍ及びスランプフロー６１×６１ｃｍとした
例、比較例３はシリカヒュームを単位セメント量に対し
て３.５％(ベントナイトを単位セメント量に対して１
２.５％)用いた例、比較例４はシリカヒュームを単位セ
メント量に対して０.１％(ベントナイトを単位セメント
量に対して０.４％)用いた例、比較例５はシリカヒュー
ムを単位セメント量に対して０.２％(ベントナイトを単
位セメント量に対して０.３％)用いた例、比較例６はシ
リカヒュームを単位セメント量に対して０.２％(ベント
ナイトを単位セメント量に対して１２.５％)用いた例を
示す。Comparative Examples 1 to 6 The same operation as in Example 1 was carried out with the blending ratios shown in Table 5, and the measurement results are shown in Table 6. Here, Comparative Example 1 is a typical mix example of conventional concrete products for civil engineering. In addition, a table vibrator was used for the preparation of the specimen for the compressive strength test, and the specimen was vibrated for 1 minute for molding. Comparative Example 2 is Comparative Example 1
An example in which a high-performance water-reducing agent was excessively added to the above concrete to make the slump 21 cm and the slump flow 61 × 61 cm, Comparative Example 3 was 3.5% silica fume per unit cement amount (bentonite per unit cement amount 1
2.5%), Comparative Example 4 uses 0.15% of silica fume per unit amount of cement (0.4% of bentonite based on unit amount of cement), Comparative Example 5 shows silica fume. Is used in an amount of 0.2% per unit amount of cement (bentonite is 0.3% relative to the unit amount of cement), Comparative Example 6 is silica fume in an amount of 0.2% per unit amount of cement (bentonite is a unit). 12.5% based on the amount of cement) is used.
【００２９】[0029]
【表５】 [Table 5]
【００３０】[0030]
【表６】 [Table 6]
【００３１】比較例７〜９ 実施例７と同一の材料を用いて表７に示す量を配合し、
実施例７と同一に操作した。なお、表８には比較例７〜
９の測定結果を併せて示す。Comparative Examples 7 to 9 Using the same materials as in Example 7, the amounts shown in Table 7 were blended,
The same operation as in Example 7 was performed. In Table 8, Comparative Examples 7 to
The measurement results of 9 are also shown.
【００３２】[0032]
【表７】 [Table 7]
【００３３】[0033]
【表８】 [Table 8]
【００３４】以下、表１〜８に示す結果を詳細に説明す
る。表２及び４に示すように、本発明の実施例では、ス
ランプは２２ｃｍを超え、スランプフローは５０ｃｍ以
上であり、中には６５×６５ｃｍ程度の高流動性のもの
もあり、しかも、材料分離を起こさず、かつブリージン
グしない高流動性コンクリートとなった。打設面の外観
状況は、従来の土木用コンクリートを振動締め固めを行
って得られる面と同程度の製品であった。また、打ち込
み上部と下部とで粗骨材の出石率の差は認められず、粗
骨材の沈降等の機械分離が無いことを示し、強度発現も
良好であった。表６及び８に示すように、比較例は実施
例に比べて流動性がなく、材料分離が見られた。The results shown in Tables 1 to 8 will be described in detail below. As shown in Tables 2 and 4, in the examples of the present invention, the slump exceeds 22 cm, the slump flow is 50 cm or more, and some of them have a high fluidity of about 65 × 65 cm. A high-fluidity concrete that does not cause bleeding and does not breathe. The appearance of the pouring surface was similar to that of the surface obtained by vibration compaction of conventional civil engineering concrete. Further, no difference in the stone extraction rate of the coarse aggregate was observed between the upper part and the lower part of the driving, showing that there was no mechanical separation such as sedimentation of the coarse aggregate, and the strength development was good. As shown in Tables 6 and 8, the comparative examples were less fluid than the examples, and material separation was observed.
【００３５】[0035]
【発明の効果】本発明に係る高性能高流動性コンクリー
ト組成物は、使用にあたり従来必須の工程であった振動
締め固め工程を省くことができるので工期を短縮するこ
とができ、また、振動機による騒音問題を解消すると共
に型枠の耐用年数を伸ばすことができる。従って、無振
動によるコンクリート打設を可能にした本発明の高性能
高流動性コンクリート組成物は極めて実用的であり、社
会への貢献度は極めて大きいものである。The high-performance and high-fluidity concrete composition according to the present invention can shorten the construction period because it can omit the vibration compaction step, which has been conventionally required in use. It is possible to solve the noise problem caused by and to extend the service life of the formwork. Therefore, the high-performance and high-fluidity concrete composition of the present invention, which enables concrete pouring without vibration, is extremely practical and contributes significantly to society.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 14:10 Ｚ 2102−4Ｇ 24:00） 2102−4Ｇ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Office reference number FI technical display location C04B 14:10 Z 2102-4G 24:00) 2102-4G
Claims (2)
珪酸、ベントナイト及び水を含有してなるコンクリート
組成物であって、単位セメント量３５０〜５００ｋｇ／
ｍ3、セメント量に対する高性能減水剤量が０.５〜５.
０重量％であり、超微粉珪酸量が０.１〜５.０重量％で
あり、ベントナイト量が０.５〜１０.０重量％であり、
かつ混練して得られる生コンクリートのスランプが２２
ｃｍ以上であり、スランプフローが５０〜７０ｃｍであ
ることを特徴とするコンクリート組成物。1. A concrete composition comprising cement, an aggregate, a high-performance water reducing agent, ultrafine silicic acid, bentonite, and water, and a unit cement amount of 350 to 500 kg /
m 3 , the amount of high-performance water reducing agent with respect to the amount of cement is 0.5 to 5.
0% by weight, ultrafine silicic acid amount of 0.1-5.0% by weight, bentonite amount of 0.5-10.0% by weight,
And the slump of ready-mixed concrete obtained by kneading is 22
cm or more and slump flow is 50 to 70 cm.
のコンクリート組成物。2. The concrete composition according to claim 1, which contains an air entraining agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13055592A JP3103195B2 (en) | 1992-05-22 | 1992-05-22 | Concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13055592A JP3103195B2 (en) | 1992-05-22 | 1992-05-22 | Concrete composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05319887A true JPH05319887A (en) | 1993-12-03 |
| JP3103195B2 JP3103195B2 (en) | 2000-10-23 |
Family
ID=15037075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13055592A Expired - Fee Related JP3103195B2 (en) | 1992-05-22 | 1992-05-22 | Concrete composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3103195B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0744387A1 (en) * | 1995-05-26 | 1996-11-27 | Marutaka Concrete Industry Co., Ltd. | Highly fluidized concrete composition |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100900597B1 (en) * | 2007-10-22 | 2009-06-02 | 서울산업대학교 산학협력단 | Inserting Material for Tunnel Cavity using discarded concrete micro-sized powder and testing device |
-
1992
- 1992-05-22 JP JP13055592A patent/JP3103195B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0744387A1 (en) * | 1995-05-26 | 1996-11-27 | Marutaka Concrete Industry Co., Ltd. | Highly fluidized concrete composition |
| AU699201B2 (en) * | 1995-05-26 | 1998-11-26 | Marutaka Concrete Industry Co., Ltd. | Highly fluidized concrete composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3103195B2 (en) | 2000-10-23 |
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