JP2016098141A - High strength concrete composition and manufacturing method of high strength concrete cured body - Google Patents

High strength concrete composition and manufacturing method of high strength concrete cured body Download PDF

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JP2016098141A
JP2016098141A JP2014236068A JP2014236068A JP2016098141A JP 2016098141 A JP2016098141 A JP 2016098141A JP 2014236068 A JP2014236068 A JP 2014236068A JP 2014236068 A JP2014236068 A JP 2014236068A JP 2016098141 A JP2016098141 A JP 2016098141A
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JP6417891B2 (en
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宏和 桐山
Hirokazu Kiriyama
宏和 桐山
喜英 佐藤
Yoshihide Sato
喜英 佐藤
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宇部興産株式会社
Ube Ind Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

PROBLEM TO BE SOLVED: To provide a high strength cement mortar composition having high compression strength without needs for large scale and special manufacturing facility.SOLUTION: There is provided a high strength concrete composition containing cement, inorganic fine powder, water, a fine aggregate, a coarse aggregate, a water-reducing agent, an antifoam agent and metal fine particles, the cement contains 10.0 mass% to 70.0 mass% of CS and 10.0 mass% to 70.0 mass% of CS, the fine aggregate contains ferronickel slag. Also there is provided a manufacturing method of a high strength concrete cured body including a pre-curing process for conducting curing in air at 15 to 25°C for 1 day to 5 days, a primary curing process for conducting curing in water at 20 to 60°C for 1 day to 7 days and a second curing process for conducting curing in water or air at 80 to 200°C for 1 day to 21 days.SELECTED DRAWING: None

Description

本発明は、高強度コンクリート組成物及び高強度コンクリート硬化体の製造方法に関する。   The present invention relates to a high-strength concrete composition and a method for producing a high-strength concrete hardened body.
近年、構造部材の軽量化、鉄筋使用量の削減などの要求に伴い、200N/mm程度の圧縮強度が得られるような超高強度材料が提案されている。これらの材料では、セメント、ポゾラン質微粉末、骨材及び高性能減水剤が使用されており、熱養生によって超高強度化が図られている。また、これらに金属繊維や有機繊維を添加することによって、高いじん性やひび割れ抑制機能を付与することが提案されている(特許文献1〜3参照)。
例えば、上記の材料よりもさらに圧縮強度の高い材料が得られれば、柱部材の受け持つ荷重をさらに増大することができるため、構造物における柱の数を減らすことができ、その結果、構造物の居住空間をさらに広げられるとともに、設計や意匠性の自由度がさらに高まることが考えられる。
In recent years, an ultra-high-strength material capable of obtaining a compressive strength of about 200 N / mm 2 has been proposed in accordance with demands for reducing the weight of structural members and reducing the amount of reinforcing bars used. In these materials, cement, pozzolanic fine powder, aggregate, and a high-performance water reducing agent are used, and ultrahigh strength is achieved by heat curing. In addition, it has been proposed to impart high toughness and crack suppression function by adding metal fibers and organic fibers to these (see Patent Documents 1 to 3).
For example, if a material having a higher compressive strength than the above-mentioned material is obtained, the load of the column member can be further increased, so that the number of columns in the structure can be reduced. It is conceivable that the living space can be further expanded and the degree of freedom in design and design is further increased.
セメント組成物の高強度化を図る場合、その水/結合材比をより小さくする方法が一般的に執られるが、結合材の化学反応をより促進するために、蒸気養生などの加熱養生がとられることがある。また、更なる高強度化のため、セメントモルタル中の空隙を極力小さくする目的で、遠心成型や加圧成型が行われることもある。また、これらの方法を組み合わせた、オートクレーブ養生やヒートプレス養生をすることで、さらに高い圧縮強度が得られることが分かっている。   In order to increase the strength of a cement composition, a method of reducing the water / binder ratio is generally adopted. However, in order to further promote the chemical reaction of the binder, heat curing such as steam curing is required. May be. In order to further increase the strength, centrifugal molding or pressure molding may be performed for the purpose of reducing the voids in the cement mortar as much as possible. It has also been found that higher compressive strength can be obtained by combining these methods with autoclave curing and heat press curing.
特開2001−181004号公報JP 2001-181004 A 特開2006−298679号公報JP 2006-298679 A 特開2007−126317号公報JP 2007-126317 A
しかしながら、これらの製造方法は、大掛かりな設備が必要であるため、容易に実施できるものではない。
そこで、本発明は、従来の技術にくらべて、大掛かりかつ特殊な製造設備を必要とせず、より高強度である高強度コンクリート組成物及び高強度コンクリート硬化体の製造方法を提供することを目的とする。
However, these manufacturing methods are not easy to implement because they require large-scale equipment.
Therefore, an object of the present invention is to provide a high-strength concrete composition and a method for producing a high-strength hardened concrete body, which are higher in strength and do not require large-scale and special production equipment, as compared with the conventional technology. To do.
本発明者らは、上記課題を解決すべく鋭意検討した結果、セメントと、シリカフュームと、フェロニッケルスラグを含む細骨材と、粗骨材と、減水剤及び消泡剤と組み合わせ、さらに、微小な金属粉末をコンクリートに混入することによって、高強度化が実現できることを見出し、本発明に至った。   As a result of intensive studies to solve the above problems, the present inventors have combined a cement, silica fume, fine aggregate containing ferronickel slag, coarse aggregate, water reducing agent and antifoaming agent, It has been found that high strength can be achieved by mixing various metal powders into concrete, and the present invention has been achieved.
すなわち、本発明は、セメントと、シリカフュームと、水と、細骨材と、粗骨材と、減水剤と、消泡剤と、金属微粉末とを含む高強度コンクリート組成物であって、セメントは、CSを10.0質量%〜70.0質量%及びCSを10.0質量%〜70.0質量%含有し、細骨材は、フェロニッケルスラグを含む高強度コンクリート組成物を提供する。このような高強度コンクリート組成物は、従来にない、非常に高い圧縮強度を発現することができる。
また、本発明は前記高強度コンクリート組成物を、15〜25℃の気中で1日間〜5日間養生を行う前養生工程と、20〜60℃の水中または気中で1日間〜7日間養生を行う一次養生工程と、80℃〜200℃の水中または気中で1日間〜21日間養生を行う二次養生工程とを含む、高強度コンクリート硬化体の製造方法を提供する。このような高強度コンクリート組成物の製造方法によれば、従来にない、非常に高い圧縮強度を有す高強度コンクリート組成物を製造することができる。
That is, the present invention is a high-strength concrete composition comprising cement, silica fume, water, fine aggregate, coarse aggregate, water reducing agent, antifoaming agent, and metal fine powder, Is a high-strength concrete composition containing 10.0 mass% to 70.0 mass% of C 3 S and 10.0 mass% to 70.0 mass% of C 2 S, and the fine aggregate includes ferronickel slag. Offer things. Such a high-strength concrete composition can express a very high compressive strength that has not existed before.
The present invention also includes a pre-curing step for curing the high-strength concrete composition in the air at 15 to 25 ° C. for 1 to 5 days, and curing for 1 to 7 days in water or air at 20 to 60 ° C. There is provided a method for producing a high-strength concrete hardened body comprising a primary curing step of performing a curing step and a secondary curing step of curing for 1 to 21 days in water or in the air at 80 ° C to 200 ° C. According to such a method for producing a high-strength concrete composition, an unprecedented high-strength concrete composition having a very high compressive strength can be produced.
本発明によれば、特殊な養生方法をとらなくとも、高い圧縮強度を持つ高強度コンクリート組成物を提供することができる。 According to the present invention, a high-strength concrete composition having high compressive strength can be provided without taking a special curing method.
以下、本発明に係る高強度コンクリート組成物及びコンクリート組成物の好適な実施形態について説明するが、本発明は以下の実施形態に限定されるものではない。   Hereinafter, preferred embodiments of the high-strength concrete composition and the concrete composition according to the present invention will be described, but the present invention is not limited to the following embodiments.
(高強度コンクリート組成物)
本実施形態の高強度コンクリート組成物は、セメントと、シリカフュームと、水と、フェロニッケルスラグを含む細骨材と、粗骨材と、減水剤と、消泡剤と、金属微粉末とを含むものである。
(High-strength concrete composition)
The high-strength concrete composition of this embodiment includes cement, silica fume, water, fine aggregate containing ferronickel slag, coarse aggregate, water reducing agent, antifoaming agent, and fine metal powder. It is a waste.
セメントの鉱物組成は、CS量が10.0〜70.0質量%、CS量が10.0〜70.0質量%、CA量が7.0質量%以下、CAF量が5.0〜15.0質量%である。CS量は、好ましくは11.0〜68.0質量%、より好ましくは12.0〜60.0質量%であり、更に好ましくは13.0〜40.0質量%、最も好ましくは15.0〜25.0質量%である。CS量が10.0質量%未満では圧縮強度が低くなる傾向があり、70.0質量%を超えると加熱養生後の圧縮強度が低くなる傾向がある。CS量は、好ましくは12.0〜65.0質量%、より好ましくは15.0〜62.0質量%であり、更に好ましくは55.0〜63.0質量%である。CS量が10.0質量%未満では、特に加熱養生後の圧縮強度が低くなる傾向がある。CA量は好ましくは7.0質量%以下であり、より好ましくは4.5質量%以下であり、更に好ましくは4.0質量%以下である。CA量が5.0%を超えると、十分な流動性が得られなくなる。CAF量は、好ましくは6.0〜15.0質量%、より好ましくは7.0〜15.0質量%であり、更に好ましくは8.0〜10.0質量%である。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。 As for the mineral composition of the cement, the amount of C 3 S is 10.0 to 70.0% by mass, the amount of C 2 S is 10.0 to 70.0% by mass, the amount of C 3 A is 7.0% by mass or less, C 4 The AF amount is 5.0 to 15.0% by mass. The amount of C 3 S is preferably 11.0 to 68.0% by mass, more preferably 12.0 to 60.0% by mass, still more preferably 13.0 to 40.0% by mass, and most preferably 15 0.0-25.0% by mass. If the amount of C 3 S is less than 10.0% by mass, the compressive strength tends to be low, and if it exceeds 70.0% by mass, the compressive strength after heat curing tends to be low. The amount of C 2 S is preferably 12.0 to 65.0 mass%, more preferably 15.0 to 62.0 mass%, and further preferably 55.0 to 63.0 mass%. When the amount of C 2 S is less than 10.0% by mass, the compressive strength particularly after heat curing tends to be low. The amount of C 3 A is preferably 7.0% by mass or less, more preferably 4.5% by mass or less, and further preferably 4.0% by mass or less. When the amount of C 3 A exceeds 5.0%, sufficient fluidity cannot be obtained. The amount of C 4 AF is preferably 6.0 to 15.0% by mass, more preferably 7.0 to 15.0% by mass, and still more preferably 8.0 to 10.0% by mass. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
セメントのブレーン比表面積は、好ましくは2500〜4800cm/g、より好ましくは2800〜4500cm/g、更に好ましくは3000〜4200cm/gであり、特に好ましくは3100〜3900cm/gである。セメントのブレーン比表面積が2500cm/g未満では高強度セメントモルタル組成物の強度が低くなる傾向があり、4800cm/gを超えると低水セメント比での流動性が低下する傾向にある。 The brane specific surface area of the cement is preferably 2500 to 4800 cm 2 / g, more preferably 2800 to 4500 cm 2 / g, still more preferably 3000 to 4200 cm 2 / g, and particularly preferably 3100 to 3900 cm 2 / g. When the brane specific surface area of the cement is less than 2500 cm 2 / g, the strength of the high-strength cement mortar composition tends to be low, and when it exceeds 4800 cm 2 / g, the fluidity at the low water cement ratio tends to decrease.
本実施形態に係るセメントの製造にあたっては、通常のセメントと特に異なる操作を行う必要はない。上記セメントは、石灰石、珪石、スラグ、石炭灰、建設発生土、高炉ダスト等の原料の調合を目標とする鉱物組成に応じて変え、実機キルンで焼成した後、得られたクリンカーに石膏を加えて所定の粒度に粉砕することによって製造することができる。焼成するキルンには、一般的なNSPキルンやSPキルン等を使用することができ、粉砕には一般的なボールミル等の粉砕機が使用可能である。また、必要に応じて、2種以上のセメントを混合することもできる。   In manufacturing the cement according to the present embodiment, it is not necessary to perform an operation different from that of normal cement. The above cement is changed according to the target mineral composition such as limestone, quartzite, slag, coal ash, construction generated soil, blast furnace dust, etc. And can be manufactured by pulverizing to a predetermined particle size. A general NSP kiln, SP kiln, or the like can be used for the kiln to be fired, and a general pulverizer such as a ball mill can be used for pulverization. Moreover, 2 or more types of cement can also be mixed as needed.
シリカフュームは、金属シリコン、フェロシリコン、電融ジルコニア等を製造する際に発生する排ガス中のダストを集塵して得られる副産物であり、主成分は、アルカリ溶液中で溶解する非晶質のSiOである。シリカフュームのBET比表面積は、好ましくは10〜30m/g、より好ましくは13〜28m/g、更に好ましくは14〜24m/g、特に好ましくは15〜18m/gである。このようなシリカフュームを用いることで、高強度コンクリート組成物の高い圧縮強度及び高い流動性を確保しやすくなる。 Silica fume is a by-product obtained by collecting dust in the exhaust gas generated when producing metal silicon, ferrosilicon, fused zirconia, etc., and the main component is amorphous SiO dissolved in an alkaline solution. 2 . BET specific surface area of silica fume is preferably 10 to 30 m 2 / g, more preferably 13~28m 2 / g, more preferably 14~24m 2 / g, particularly preferably 15~18m 2 / g. By using such silica fume, it becomes easy to ensure high compressive strength and high fluidity of the high-strength concrete composition.
本実施形態の高強度コンクリート組成物において、セメント及びシリカフュームの合計量を基準として、シリカフュームを、好ましくは5〜35質量%、より好ましくは7〜30質量%、更に好ましくは8〜27質量%、特に好ましくは9〜23質量%含む。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。   In the high-strength concrete composition of the present embodiment, the silica fume is preferably 5 to 35% by mass, more preferably 7 to 30% by mass, still more preferably 8 to 27% by mass, based on the total amount of cement and silica fume. Particularly preferably, the content is 9 to 23% by mass. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
細骨材は、フェロニッケルスラグを使用する。フェロニッケルスラグを使用することにより、コンクリート組成物の圧縮強度が向上する。フェロニッケルスラグは,モース硬さが7.0〜8.5、好ましくは7.2〜8.0、より好ましくは7.3〜7.9、さらに好ましくは7.4〜7.8、絶乾密度が2.7〜4.0g/cm、好ましくは2.7〜3.8g/cm、より好ましくは2.8〜3.5g/cm、さらに好ましくは2.9〜3.3g/cmであると、より一層強度が大きくなる。また、適時、他の種類の細骨材と組み合わせて使用しても良い。具体的には、川砂、陸砂、海砂、砕砂、珪砂、石灰石骨材、高炉スラグ細骨材銅スラグ細骨材、電気炉酸化スラグ細骨材等を使用することができる。
粗骨材としては、特に制限されないが、砂利、砕石、石灰石骨材、高炉スラグ粗骨材等を使用することができる。なお、粗骨材の粒度は、5mmの篩いに85質量%以上とどまるものが好ましい。
As the fine aggregate, ferronickel slag is used. By using ferronickel slag, the compressive strength of the concrete composition is improved. Ferronickel slag has a Mohs hardness of 7.0 to 8.5, preferably 7.2 to 8.0, more preferably 7.3 to 7.9, still more preferably 7.4 to 7.8. The dry density is 2.7 to 4.0 g / cm 3 , preferably 2.7 to 3.8 g / cm 3 , more preferably 2.8 to 3.5 g / cm 3 , and even more preferably 2.9 to 3 . When it is 3 g / cm 3 , the strength is further increased. Further, it may be used in combination with other types of fine aggregates at appropriate times. Specifically, river sand, land sand, sea sand, crushed sand, quartz sand, limestone aggregate, blast furnace slag fine aggregate copper slag fine aggregate, electric furnace oxidized slag fine aggregate, and the like can be used.
Although it does not restrict | limit especially as a coarse aggregate, Gravel, a crushed stone, a limestone aggregate, a blast furnace slag coarse aggregate, etc. can be used. The coarse aggregate preferably has a particle size of 85% by mass or more on a 5 mm sieve.
減水剤としては、リグニン系、ナフタレンスルホン酸系、アミノスルホン酸系、ポリカルボン酸系の減水剤、高性能減水剤、高性能AE減水剤等を使用することができる。低水セメント比での流動性確保の観点から、減水剤として、ポリカルボン酸系の減水剤、高性能減水剤又は高性能AE減水剤を用いることが好ましく、ポリカルボン酸系の高性能減水剤を用いることがより好ましい。本実施形態に係る高強度セメントモルタル組成物は、セメントとシリカフュームの合量100質量部に対して、減水剤を好ましくは1.0〜6.0質量部、より好ましくは1.5〜5.0質量部、更に好ましくは1.8〜4.5質量部、特に好ましくは2.2〜4.0質量部含む。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。   As the water reducing agent, lignin-based, naphthalenesulfonic acid-based, aminosulfonic acid-based, polycarboxylic acid-based water reducing agents, high-performance water reducing agents, high-performance AE water reducing agents, and the like can be used. From the viewpoint of ensuring fluidity at a low water cement ratio, it is preferable to use a polycarboxylic acid-based water reducing agent, a high-performance water reducing agent or a high-performance AE water reducing agent as the water reducing agent, and a polycarboxylic acid-based high-performance water reducing agent. It is more preferable to use In the high-strength cement mortar composition according to this embodiment, the water reducing agent is preferably 1.0 to 6.0 parts by mass, and more preferably 1.5 to 5.5, with respect to 100 parts by mass of the total amount of cement and silica fume. 0 parts by mass, more preferably 1.8 to 4.5 parts by mass, particularly preferably 2.2 to 4.0 parts by mass. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
また、セメントとシリカフュームの合量100質量部に対して、水を好ましくは9〜20質量部、より好ましくは9.5〜18質量部、更に好ましくは10.0〜16質量部、特に好ましくは10.5〜14.0質量部含む。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。   The amount of water is preferably 9 to 20 parts by weight, more preferably 9.5 to 18 parts by weight, still more preferably 10.0 to 16 parts by weight, particularly preferably 100 parts by weight of the total amount of cement and silica fume. Including 10.5 to 14.0 parts by mass. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
消泡剤としては、特殊非イオン配合型界面活性剤、ポリアルキレン誘導体、疎水性シリカ、ポリエーテル系等が挙げられる。この場合、セメントとシリカフュームの合量100質量部に対して、消泡剤を好ましくは0.01〜2.0質量部、より好ましくは0.1〜1.0質量部、更に好ましくは0.2〜0.5質量部含む。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。   Examples of antifoaming agents include special nonionic compounding surfactants, polyalkylene derivatives, hydrophobic silica, and polyethers. In this case, the antifoaming agent is preferably 0.01 to 2.0 parts by weight, more preferably 0.1 to 1.0 parts by weight, and still more preferably 0.000 parts by weight with respect to 100 parts by weight of the total amount of cement and silica fume. 2 to 0.5 parts by mass are included. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
金属微粉末は、カットスチールウール及び/又は鉄粉等を使用することができる。カットスチールウールとはスチールウールを短く切断したものを意味する。またスチールウールとは鉄の非常に細い線を綿状に固めた物で、研磨用のたわしとして使用されることがある。
金属微粉末の形状は、直径が好ましくは5μm〜500μm、より好ましくは10μm〜420μm、更に好ましくは15μm〜400μm、特に好ましくは20μm〜380μmである。長さは好ましくは5μm〜5.0mm、より好ましくは20μm〜4.0mm、更に好ましくは30μm〜3.8mm、特に好ましくは50μm〜3.5mmである。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。
As the metal fine powder, cut steel wool and / or iron powder or the like can be used. Cut steel wool means steel wool cut into short pieces. Steel wool is a product in which very thin wires of iron are hardened in a cotton form, and is sometimes used as a scrubbing brush.
The shape of the metal fine powder is preferably 5 μm to 500 μm in diameter, more preferably 10 μm to 420 μm, still more preferably 15 μm to 400 μm, and particularly preferably 20 μm to 380 μm. The length is preferably 5 μm to 5.0 mm, more preferably 20 μm to 4.0 mm, still more preferably 30 μm to 3.8 mm, and particularly preferably 50 μm to 3.5 mm. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
(高強度コンクリート硬化体の製造方法)
本実施形態の高強度コンクリート硬化体の製造方法は、上記高強度コンクリート組成物を、15〜25℃の気中で1日間〜5日間養生を行う前養生工程と、20〜60℃の水中または気中で1日間〜7日間養生を行う一次養生工程と、80℃〜200℃の水中または気中で1日間〜21日間養生を行う二次養生工程とを含む。
一次養生工程は、好ましくは23〜55℃、より好ましくは25〜50℃、更に好ましくは28〜48℃、特に好ましくは30〜45℃の水中で、好ましくは1〜7日間、より好ましくは1.5〜6日間、更に好ましくは1.8〜5日間、特に好ましくは2.0〜4.5日間養生を行う。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。
(Manufacturing method of high strength concrete hardened body)
The manufacturing method of the high-strength concrete hardened | cured material of this embodiment is the pre-curing process which cures the said high-strength concrete composition in the air of 15-25 degreeC for 1 day-5 days, and 20-20 degreeC water or A primary curing process in which the curing is performed in the air for 1 day to 7 days, and a secondary curing process in which the curing is performed in water at 80 ° C. to 200 ° C. or in the air for 1 to 21 days.
The primary curing step is preferably 23 to 55 ° C, more preferably 25 to 50 ° C, still more preferably 28 to 48 ° C, particularly preferably 30 to 45 ° C in water, preferably 1 to 7 days, more preferably 1 Curing is carried out for 5 to 6 days, more preferably 1.8 to 5 days, particularly preferably 2.0 to 4.5 days. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
二次養生工程は、好ましくは80〜200℃、より好ましくは83〜190℃、更に好ましくは85〜185℃、特に好ましくは90〜180℃の水中または気中で、好ましくは1〜21日間、より好ましくは3〜19日間、更に好ましくは5〜17日間、特に好ましくは7〜15日間養生を行う。水中の場合、温水、気中の場合、蒸気養生装置、オートクレーブ、乾燥機などが使用出来る。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。   The secondary curing step is preferably 80 to 200 ° C, more preferably 83 to 190 ° C, still more preferably 85 to 185 ° C, particularly preferably 90 to 180 ° C in water or in the air, preferably 1 to 21 days. More preferably 3 to 19 days, still more preferably 5 to 17 days, particularly preferably 7 to 15 days. In water, warm water, in the air, steam curing devices, autoclaves, dryers, etc. can be used. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
本実施形態の高強度コンクリート硬化体の製造方法は、上記高強度コンクリート組成物を、さらに、80℃〜200℃の気中で1日間〜21日間養生を行う三次養生工程を行っても良い。   The manufacturing method of the high-strength concrete hardened | cured material of this embodiment may perform the tertiary curing process which cures the said high-strength concrete composition further in the air | atmosphere of 80 to 200 degreeC for 1 day-21 days.
三次養生工程は、好ましくは80〜200℃、より好ましくは83〜190℃、更に好ましくは85〜185℃、特に好ましくは90〜180℃の気中で、好ましくは1〜21日間、より好ましくは3〜19日間、更に好ましくは5〜17日間、特に好ましくは7〜15日間養生を行う。
水中の場合、温水、気中の場合、蒸気養生装置、オートクレーブ、乾燥機などが使用出来る。三次養生工程では、水中よりも気中養生の方が、強度増進の観点からより好ましい。以上の範囲であれば、高い圧縮強度及び高い流動性を十分に確保出来る。
The tertiary curing step is preferably 80 to 200 ° C, more preferably 83 to 190 ° C, still more preferably 85 to 185 ° C, particularly preferably 90 to 180 ° C, preferably 1 to 21 days, more preferably Curing is performed for 3 to 19 days, more preferably 5 to 17 days, particularly preferably 7 to 15 days.
In water, warm water, in the air, steam curing devices, autoclaves, dryers, etc. can be used. In the tertiary curing process, air curing is more preferable than water from the viewpoint of strength enhancement. If it is the above range, high compressive strength and high fluidity | liquidity can fully be ensured.
以下、実施例及び比較例を挙げて本発明の内容をより具体的に説明する。なお、本発明は下記実施例に限定されるものではない。   Hereinafter, the contents of the present invention will be described more specifically with reference to examples and comparative examples. In addition, this invention is not limited to the following Example.
[使用材料の準備]
実施例及び比較例のコンクリート組成物を作製するために、以下に示す材料を準備した。
[Preparation of materials used]
In order to produce the concrete compositions of Examples and Comparative Examples, the following materials were prepared.
(1)セメント
セメントは鉱物組成の異なる3種類を使用した。使用したセメントの化学成分を、JIS R 5202−2010「セメントの化学分析方法」に従い測定し、鉱物組成を下記のボーグ式により算出した。得られたセメントの鉱物組成を表1に示す。
(1) Three types of cement cements with different mineral compositions were used. The chemical components of the cement used were measured according to JIS R 5202-2010 “Cement chemical analysis method”, and the mineral composition was calculated by the following Borg equation. The mineral composition of the obtained cement is shown in Table 1.
S量=(4.07×CaO)−(7.60×SiO)−(6.72×Al)−(1.43×Fe)−(2.85×SO
S量=(2.87×SiO)−(0.754×CS)
A量=(2.65×Al)−(1.69×Fe
AF量=3.04×Fe
C 3 S amount = (4.07 × CaO) − (7.60 × SiO 2 ) − (6.72 × Al 2 O 3 ) − (1.43 × Fe 2 O 3 ) − (2.85 × SO 3 )
C 2 S amount = (2.87 × SiO 2 ) − (0.754 × C 3 S)
C 3 A amount = (2.65 × Al 2 O 3 ) − (1.69 × Fe 2 O 3 )
C 4 AF amount = 3.04 × Fe 2 O 3
(2)シリカフューム
(A)シリカフュームA:密度2.2g/cm,BET比表面積22.8m/g
(B)シリカフュームB:密度2.2g/cm,BET比表面積16.0m/g
(2) Silica fume (A) Silica fume A: density 2.2 g / cm 3 , BET specific surface area 22.8 m 2 / g
(B) Silica fume B: density 2.2 g / cm 3 , BET specific surface area 16.0 m 2 / g
(3)細骨材
(A)砕砂(安山岩):密度2.62g/cm、粗粒率2.80、吸水率2.5質量%
(B)フェロニッケルスラグ:絶乾密度3.10g/cm、粗粒率2.75、吸水率0.3質量%、モース硬さ7.5
(3) Fine aggregate (A) Crushed sand (andesite): density 2.62 g / cm 3 , coarse particle ratio 2.80, water absorption 2.5 mass%
(B) Ferro-nickel slag: absolutely dry density 3.10 g / cm 3 , coarse particle ratio 2.75, water absorption 0.3 mass%, Mohs hardness 7.5
(4)粗骨材
(A)砕石1305(安山岩):密度2.62g/cm、粗粒率2.80、吸水率2.5質量%
(B)砕石1305(硬質砂岩):絶乾密度2.65g/cm、粗粒率6.51、吸水率0.61質量%
(4) Coarse aggregate (A) Crushed stone 1305 (andesite): density 2.62 g / cm 3 , coarse particle ratio 2.80, water absorption 2.5 mass%
(B) Crushed stone 1305 (hard sandstone): absolutely dry density 2.65 g / cm 3 , coarse particle ratio 6.51 and water absorption 0.61% by mass
(5)減水剤:ポリカルボン酸系高性能減水剤(固形分濃度25質量%)
(6)消泡剤:特殊非イオン配合型界面活性剤
(7)金属微紛末:カットスチールウール:日本スチールウール社製、直径20〜30μm、長さ0.1〜3mm、密度7.85g/cm
(8)練混ぜ水(W):上水道水
(5) Water reducing agent: polycarboxylic acid-based high-performance water reducing agent (solid content concentration 25% by mass)
(6) Antifoaming agent: special nonionic compound type surfactant (7) Metal fine powder powder: Cut steel wool: manufactured by Nippon Steel Wool Co., Ltd., diameter 20-30 μm, length 0.1-3 mm, density 7.85 g / Cm 3
(8) Mixing water (W): Tap water
[高強度コンクリート組成物の作製]
高強度コンクリート組成物の作製を、表3の配合組成に基づき、以下の通りに行った。
[Production of high-strength concrete composition]
A high-strength concrete composition was produced as follows based on the composition shown in Table 3.


セメント、シリカフューム、消泡剤及び細骨材をコンクリートミキサに加え、減水剤を含む練混ぜ水をミキサ内に投入して10分間撹拌し、その後、粗骨材をミキサに投入して1分30秒間攪拌し、コンクリート組成物を作製した。なお、実施例1〜6では、金属微紛末を更に投入して、高強度コンクリート組成物を作製した。   Cement, silica fume, antifoaming agent and fine aggregate are added to the concrete mixer, mixing water containing a water reducing agent is put into the mixer and stirred for 10 minutes, and then the coarse aggregate is put into the mixer for 1 minute 30 The mixture was stirred for 2 seconds to prepare a concrete composition. In Examples 1 to 6, metal fine powder powder was further added to produce a high-strength concrete composition.
[養生方法]
練り混ぜた高強度コンクリート組成物は、型枠に充填後、20℃、湿度約70%の気中で3日間養生後、脱型し、40℃の水中で3日間の一次養生の工程を実施した。その後、二次養生として、98℃の温水中で7日間養生し、その後、7日間、98℃の乾燥機で乾燥させた。これらの養生を行い、高強度コンクリート硬化体を作製した。
[Curing method]
The high-strength concrete composition that has been kneaded is filled into a mold, cured in an atmosphere of 20 ° C and humidity of about 70% for 3 days, demolded, and then subjected to a primary curing process in 40 ° C water for 3 days. did. Thereafter, as secondary curing, curing was carried out in 98 ° C. warm water for 7 days, and then dried for 7 days with a 98 ° C. dryer. These curings were performed to produce a high-strength concrete hardened body.
[高強度コンクリート組成物の評価]
(1)フレッシュ性状
(試験方法)
比較例1〜3および実施例1〜6の配合で作製した高強度コンクリート組成物を用いて、スランプフローを測定した。スランプフローは、JIS A 1150−2007「コンクリートのスランプフロー試験方法」に準じて測定した。
[Evaluation of high-strength concrete composition]
(1) Fresh properties (test method)
The slump flow was measured using the high-strength concrete compositions prepared by the blending of Comparative Examples 1 to 3 and Examples 1 to 6. The slump flow was measured according to JIS A 1150-2007 “Concrete slump flow test method”.
(2)強度試験
JIS A 1132−2006「コンクリートの強度試験用供試体の作り方」に準じて10cm×20cmの円柱供試体を作製し、JIS A 1108−2006「コンクリートの圧縮強度試験方法」に準じて高強度コンクリート硬化体の圧縮強度試験を実施した。
(2) Strength test A 10 cm × 20 cm cylindrical specimen was prepared according to JIS A 1132-2006 “How to make a specimen for concrete strength test”, and according to JIS A 1108-2006 “Concrete compressive strength test method”. The compressive strength test of the high strength concrete hardened body was carried out.
(評価結果)
表4に、スランプフローおよび圧縮強度試験結果を示す。
(Evaluation results)
Table 4 shows the slump flow and compressive strength test results.
比較例1〜3のように、金属微紛末を用いない場合、二次養生後の圧縮強度が230〜250N/mm程度となった。また、三次養生を実施した場合の強度増進はほとんどなかった。その中でも、比較例3のように,粗骨材量が増大すると,強度が10〜20N/mm低下した。
全ての実施例で,金属微紛末の添加により,スランプフローがやや小さくなった。
実施例1のように,細骨材にフェロニッケルスラグを用い,金属微紛末を添加することによって、圧縮強度が大きく増大し,二次養生後で280N/mmとなった。さらに,三次養時の強度増進が大きくなり,300N/mm以上の圧縮強度が得られた。
実施例2および3のように,水結合材比を11.5%および11.0%と小さくした場合は,スランプフローは小さくなる傾向にあった。また,圧縮強度への影響は小さかった。
実施例4のように,粗骨材量を増大させた場合は,比較例3と同様に二次養生後20N/mm程度強度が低下したが,三次養生後の圧縮強度は270N/mmと高い強度が得られた。
実施例5および6のように,セメント種類を変えた場合にも,三次養生後には270N/mmと高い圧縮強度が得られた。
実施例6および7のように,シリカフュームの種類が強度へ及ぼす影響はなかった。
また、二次養生の水中養生後に三次養生の気中養生を施すと、非常に高い圧縮強度が得られた。セメントの養生は、一般的に水中で十分に水和させることが重要とされているが、ある程度水中養生した後は気中養生した方が良いことが示唆されている。シリカフュームを低水セメント比で使用したコンクリートでは、シリカフュームの水和を十分に行わせることが重要で、気中養生の場合、硬化体の微細な空隙への蒸気の浸透などが起こり易く水和が進行するような現象が起こっていると推察される。
When the metal fine powder powder was not used as in Comparative Examples 1 to 3, the compressive strength after secondary curing was about 230 to 250 N / mm 2 . In addition, there was almost no increase in strength when tertiary curing was performed. Among them, as in Comparative Example 3, when the amount of coarse aggregate increased, the strength decreased by 10 to 20 N / mm 2 .
In all the examples, the slump flow was slightly reduced by adding metal fine powder.
As in Example 1, by using ferronickel slag as a fine aggregate and adding metal fine powder powder, the compressive strength was greatly increased to 280 N / mm 2 after secondary curing. In addition, the strength enhancement during tertiary cultivation increased, and a compressive strength of 300 N / mm 2 or more was obtained.
As in Examples 2 and 3, when the water binder ratio was decreased to 11.5% and 11.0%, the slump flow tended to decrease. The effect on compressive strength was small.
As in Example 4, when the amount of coarse aggregate was increased, the strength decreased by about 20 N / mm 2 after secondary curing as in Comparative Example 3, but the compressive strength after tertiary curing was 270 N / mm 2. High strength was obtained.
Even when the cement type was changed as in Examples 5 and 6, a high compressive strength of 270 N / mm 2 was obtained after the tertiary curing.
As in Examples 6 and 7, the type of silica fume had no effect on strength.
Moreover, when the air curing of the tertiary curing was performed after the water curing of the secondary curing, a very high compressive strength was obtained. Cement curing is generally considered to be sufficiently hydrated in water, but it has been suggested that after a certain amount of water curing, air curing is better. In concrete using silica fume at a low water cement ratio, it is important to fully hydrate the silica fume. In the case of air curing, hydration tends to occur due to the penetration of steam into fine voids in the cured body. It is inferred that there is a phenomenon that progresses.

Claims (9)

  1. セメントと、シリカフュームと、水と、細骨材と、粗骨材と、減水剤と、消泡剤と、金属微粉末とを含む高強度コンクリート組成物であって、
    前記セメントは、CSを10.0質量%〜70.0質量%及びCSを10.0質量%〜70.0質量%含有し、
    前記細骨材は、フェロニッケルスラグを含むことを特徴とする高強度コンクリート組成物。
    A high-strength concrete composition comprising cement, silica fume, water, fine aggregate, coarse aggregate, water reducing agent, antifoaming agent, and metal fine powder,
    The cement is a C 3 S 10.0 wt% 70.0 wt% and C 2 S contained 10.0 wt% 70.0 wt%,
    The high-strength concrete composition, wherein the fine aggregate contains ferronickel slag.
  2. 前記金属微粉末は、カットスチールウールである、請求項1に記載の高強度コンクリート組成物。   The high-strength concrete composition according to claim 1, wherein the metal fine powder is cut steel wool.
  3. 前記金属微粉末は、直径が5μm〜500μm及び長さが5μm〜5.0mmであり、前記高強度コンクリート組成物に対して1.0体積%〜5.0体積%含む、請求項1又は2に記載の高強度コンクリート組成物。   The metal fine powder has a diameter of 5 µm to 500 µm and a length of 5 µm to 5.0 mm, and includes 1.0 vol% to 5.0 vol% with respect to the high-strength concrete composition. A high-strength concrete composition as described in 1.
  4. 前記シリカフュームのBET比表面積が10〜30m/gである、請求項1〜3の何れか1項に記載の高強度コンクリート組成物。 The high-strength concrete composition according to any one of claims 1 to 3, wherein the silica fume has a BET specific surface area of 10 to 30 m 2 / g.
  5. 前記フェロニッケルスラグのモース硬さが7.0〜8.5、絶乾密度が2.7〜4.0g/cmである、請求項1〜3の何れか1項に記載の高強度コンクリート組成物。 The high-strength concrete according to any one of claims 1 to 3 , wherein the ferronickel slag has a Mohs hardness of 7.0 to 8.5 and an absolutely dry density of 2.7 to 4.0 g / cm 3. Composition.
  6. 前記セメントと前記シリカフュームの合計量100質量%中に、前記シリカヒュームを5質量%〜35質量%含む、請求項1〜5の何れか1項に記載の高強度コンクリート組成物。   The high-strength concrete composition according to any one of claims 1 to 5, wherein the silica fume is contained in an amount of 5 to 35% by mass in a total amount of 100% by mass of the cement and the silica fume.
  7. 前記セメントと前記シリカフュームの合計量100質量部に対して、水を9質量部〜20質量部及び減水剤を1.0質量部〜6.0質量部含む、請求項1〜6の何れか1項に記載の高強度コンクリート組成物。   Any one of Claims 1-6 containing 9 mass parts-20 mass parts of water and 1.0 mass part-6.0 mass parts of water reducing agents with respect to 100 mass parts of total amounts of the said cement and the said silica fume. The high-strength concrete composition according to item.
  8. 請求項1〜7の何れか1項に記載の高強度コンクリート組成物を、15〜25℃の気中で1日間〜5日間養生を行う前養生工程と、20〜60℃の水中または気中で1日間〜7日間養生を行う一次養生工程と、80℃〜200℃の水中または気中で1日間〜21日間養生を行う二次養生工程とを含む、高強度コンクリート硬化体の製造方法。   A pre-curing step for curing the high-strength concrete composition according to any one of claims 1 to 7 in the air at 15 to 25 ° C for 1 to 5 days, and water or air at 20 to 60 ° C A method for producing a high-strength concrete hardened body comprising a primary curing step of curing for 1 to 7 days and a secondary curing step of curing for 1 to 21 days in water or in the air at 80 to 200 ° C.
  9. 更に、80℃〜200℃の気中で1日間〜21日間養生を行う三次養生工程とを含む、請求項8記載の高強度コンクリート硬化体の製造方法。   Furthermore, the manufacturing method of the high-strength concrete hardening body of Claim 8 including the tertiary curing process which cures for 1 to 21 days in the 80 to 200 degreeC air | atmosphere.
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