JPH08277157A - Concrete composition - Google Patents
Concrete compositionInfo
- Publication number
- JPH08277157A JPH08277157A JP9991795A JP9991795A JPH08277157A JP H08277157 A JPH08277157 A JP H08277157A JP 9991795 A JP9991795 A JP 9991795A JP 9991795 A JP9991795 A JP 9991795A JP H08277157 A JPH08277157 A JP H08277157A
- Authority
- JP
- Japan
- Prior art keywords
- fly ash
- concrete
- aggregate
- coarse aggregate
- cement
- 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
- 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
- C04B28/04—Portland 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、フライアッシュを大量
に活用した強度発現の良好な軽量コンクリート組成物に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight concrete composition which utilizes fly ash in a large amount and exhibits good strength.
【０００２】[0002]
【従来の技術】火力発電所の微粉炭燃焼ボイラから副産
品として大量に産出されるフライアッシュは、セメント
混和材やコンクリート用骨材等に一部有効利用されてい
るものの、大部分が埋立て等の廃棄処分されている。セ
メント混和材として用いられるフライアッシュは、フラ
イアッシュ粒子が平滑かつ球状であるためコンクリート
のワーカビリティーが向上すること、コンクリート組織
が緻密化し、長期強度が増大するとともに、水密性、化
学薬品に対する抵抗性等が向上すること、フライアッシ
ュの混入によってセメントの水和発熱が緩和されるため
自己発熱による温度ひび割れが問題となるマスコンクリ
ート構造物に適していること、アルカリ骨材反応に対す
る抑制効果も有していることなど、コンクリートとして
優れた特性を多く有している。又、コンクリート用骨材
としては、フライアッシュを原料として発泡軽量化した
市販の人工軽量骨材が主として使用されている。2. Description of the Related Art Fly ash, which is produced in large quantities as a by-product from a pulverized coal combustion boiler of a thermal power plant, is effectively used as a cement admixture or an aggregate for concrete, but most of it is landfill. Has been disposed of. Fly ash used as a cement admixture has improved workability of concrete because the fly ash particles are smooth and spherical, and the concrete structure is densified to increase the long-term strength, watertightness, resistance to chemicals, etc. It is suitable for mass concrete structure where temperature crack due to self-heating is a problem because the heat of hydration of cement is mitigated by the mixture of fly ash, and it also has an inhibitory effect on alkali-aggregate reaction. It has many excellent properties as concrete, such as being present. Further, as the aggregate for concrete, a commercially available lightweight artificial aggregate made of fly ash as a raw material is used.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、フライ
アッシュをコンクリートに多量に混合した場合には凝結
の遅延、初期強度の低下、低温環境下における強度発現
の遅れ等々の問題点があり、自ずとその混合量に制限が
ある。例えば、ＪＩＳ規格に規定されているフライアッ
シュセメントは、セメントに対するフライアッシュの置
換割合を最大で３割に制限しており、フライアッシュの
大量使用に結び付いていないのが現状である。However, when fly ash is mixed with a large amount of concrete, there are problems such as delay of setting, reduction of initial strength, delay of strength development in a low temperature environment, and the like. There is a limit to the amount. For example, the fly ash cement stipulated in JIS standard limits the replacement ratio of fly ash to cement to 30% at the maximum, and is not currently associated with the large use of fly ash.
【０００４】又、フライアッシュを原料として発泡軽量
化した骨材は、骨材自体の吸水率が高く水分量の管理が
難しい上、骨材の強度も低いために、この骨材を用いた
コンクリートは、コンクリートの軽量化に伴って比例的
に強度も低下し、その適用範囲が限られたものとなって
いる。Further, since the aggregate made of fly ash as a raw material by foaming and making it lightweight has a high water absorption rate of the aggregate itself, it is difficult to control the water content, and the strength of the aggregate is also low, the concrete using this aggregate is As the weight of concrete decreases, its strength also decreases proportionally, and its application range is limited.
【０００５】従って、この発明は、コンクリート配合を
適切に定めると共に、人工粗骨材として発泡軽量化した
骨材ではなく、密実なフライアッシュ質人工粗骨材を用
いることにより、フライアッシュをコンクリート用混和
材及び粗骨材の両面から大量使用することを可能とし
た、軽量で強度発現が良好なコンクリート組成物を提供
することを目的とする。Therefore, according to the present invention, the fly ash is made concrete by appropriately determining the concrete mixture and using the solid fly ash quality artificial coarse aggregate as the artificial coarse aggregate instead of the foamed and lightweight aggregate. It is an object of the present invention to provide a lightweight concrete composition capable of being used in a large amount from both sides of an admixture for admixture and a coarse aggregate and exhibiting good strength.
【０００６】[0006]
【課題を解決するための手段】上述の目的を達成するた
めに、この発明のコンクリート組成物によれば、セメン
ト（Ｃ）、細骨材（Ｓ）、粗骨材（Ｇ）、フライアッシ
ュ（Ｆ）、及び水（Ｗ）を含むコンクリート組成物であ
って、単位セメント量が２５０〜３５０kg/m3、単位フ
ライアッシュ量が１５０〜３００kg/m3 であり、且つ、
粗骨材（Ｇ）として絶乾比重が１．８〜２．２のフライ
アッシュ質人工粗骨材を用いたこと（請求項１）、水セ
メント比（Ｗ／Ｃ）が４５重量％以上であること（請求
項２）、フライアッシュ質人工粗骨材がフライアッシュ
を主要成分とした造粒物を焼成することにより得られる
人工骨材であること（請求項３）、フライアッシュ質人
工粗骨材の実積率が６０％以上、好ましくは６３〜７０
％であること（請求項４）、コンクリートの単位容積重
量が１．９〜２．２kg/lであること（請求項５）、高性
能減水剤をさらに含むこと（請求項６）、セメントが普
通ポルトランドセメント又は早強ポルトランドセメント
であること（請求項７）、を特徴とする。以下、この発
明を詳しく説明する。In order to achieve the above-mentioned object, according to the concrete composition of the present invention, cement (C), fine aggregate (S), coarse aggregate (G), fly ash ( F) and a concrete composition containing water (W), wherein the unit cement amount is 250 to 350 kg / m 3 , the unit fly ash amount is 150 to 300 kg / m 3 , and
A fly ash artificial coarse aggregate having an absolute dry specific gravity of 1.8 to 2.2 was used as the coarse aggregate (G) (claim 1), and the water cement ratio (W / C) was 45% by weight or more. There is (claim 2), the fly ash artificial coarse aggregate is an artificial aggregate obtained by firing a granulated product containing fly ash as a main component (claim 3), fly ash artificial coarse aggregate The actual volume of aggregate is 60% or more, preferably 63 to 70
% (Claim 4), the unit volume weight of concrete is 1.9 to 2.2 kg / l (Claim 5), a high performance water reducing agent is further included (Claim 6), and the cement is Ordinary Portland cement or early-strength Portland cement (claim 7). Hereinafter, the present invention will be described in detail.
【０００７】この発明で使用するセメントは、普通、早
強、超早強、中庸熱、耐硫酸塩、白色などの各種ポルト
ランドセメントがいずれも使用できるが、初期並びに長
期強度発現性の改善に大きな効果を発揮するためには、
望ましくは普通ポルトランドセメントあるいは早強ポル
トランドセメントを使用する。セメントの使用量は、コ
ンクリート中の単位セメント量が２５０〜３５０kg/m3
の範囲とする。単位セメント量が２５０kg/m3 を下回る
と、強度発現性、特に、初期強度の低下が大きく好まし
くない。又、これが３５０kg/m3 を超えると、この発明
の目的とするフライアッシュの大量使用において、コン
クリートの練り混ぜが困難となり好ましくない。As the cement used in the present invention, various kinds of portland cements such as normal strength, early strength, super-early strength, moderate heat, sulfate resistance, and white can be used, but they are great for improving initial and long-term strength development. To be effective,
Preferably, normal Portland cement or early-strength Portland cement is used. The amount of cement used is 250 to 350 kg / m 3 per unit amount of cement in concrete.
Range. When the unit cement content is less than 250 kg / m 3 , strength development, particularly initial strength, is lowered, which is not preferable. On the other hand, if it exceeds 350 kg / m 3 , it is not preferable because the mixing of concrete becomes difficult in the mass use of fly ash which is the object of the present invention.
【０００８】次に、フライアッシュは、ＪＩＳで規定さ
れるフライアッシュは無論、通常原粉と称されるフライ
アッシュ、及びシンダーアッシュをも含めた、いわゆる
広い意味での石炭灰全般を使用することができる。フラ
イアッシュの使用量は、コンクリート中の単位フライア
ッシュ量が１５０〜３００kg/m3 の範囲とする。単位フ
ライアッシュ量が１５０kg/m3 を下回ると、この発明の
目的とするフライアッシュの大量使用の趣旨にそぐわな
く、しかも、強度発現性が十分でない上、後述する骨
材、特に、粒度バランスの悪い細骨材の使用に制限を受
け好ましくない。又、これが３００kg/m3 を超えると、
コンクリートの流動性が失われ、練り混ぜが困難となり
好ましくない。[0008] Next, as fly ash, of course, fly ash defined by JIS is obviously used, and fly ash usually called raw powder and cinder ash are used in general in the so-called broad sense of coal ash. You can The amount of fly ash used is such that the amount of unit fly ash in concrete is in the range of 150 to 300 kg / m 3 . If the unit fly ash amount is less than 150 kg / m 3 , it does not meet the purpose of mass use of fly ash, which is the object of the present invention, and the strength development is not sufficient, and the aggregate to be described later, in particular, the particle size balance It is not preferable because the use of bad fine aggregate is restricted. Also, if this exceeds 300 kg / m 3 ,
It is not preferable because the fluidity of concrete is lost and it is difficult to mix and mix.
【０００９】この発明の骨材、特に粗骨材は、発泡軽量
化した人工骨材ではなく、密実な絶乾比重が１．８〜
２．２のフライアッシュ質人工骨材を使用する。絶乾比
重が１．８を下回ると、骨材として密実性がなく高強度
のコンクリートが得られず、絶乾比重が２．２を越える
と、コンクリートの軽量化を図ることができない。又、
このフライアッシュ質人工骨材は、吸水率が３．０％以
下で圧縮強度が４００ｋｇ／ｃｍ2以上、さらに、実積
率が６０％以上、好ましくは６３〜７０％であることが
望ましく、この発明の好適な軽量で高強度のコンクリー
トとすることができる。The aggregate of the present invention, particularly the coarse aggregate, is not an artificial aggregate that is foamed and lightened, but has a solid absolute dry specific gravity of 1.8 to.
Use the fly ash quality artificial aggregate of 2.2. If the absolute dry specific gravity is less than 1.8, it is not possible to obtain concrete having high solidity without being solid as an aggregate, and if the absolute dry specific gravity exceeds 2.2, the weight of the concrete cannot be reduced. or,
This fly ash artificial aggregate has a water absorption rate of 3.0% or less, a compressive strength of 400 kg / cm 2 or more, and an actual volume ratio of 60% or more, preferably 63 to 70%. The lightweight and high-strength concrete suitable for the invention can be obtained.
【００１０】フライアッシュ質人工骨材は、フライアッ
シュを主要成分とした造粒物を焼成することにより得ら
れるもので、発泡タイプの骨材は、市販品をはじめとし
て各種のものが提案されている。しかしながら、発泡タ
イプは、前述したように高強度と軽量性の相反する要求
性能を満足することができないものであり、この発明で
は、例えば、本出願人が先に特願平６−５９３４０号と
して提案した造粒型の人工骨材が好適に使用できる。こ
の骨材は、フライアッシュに必要に応じて石灰石粉末
（炭カル）を加えて成分調整し、所定量のベントナイト
及び水を添加して造粒し、この造粒物の発泡領域を避
け、緻密化する温度領域で焼成することにより、ほぼ球
形の実積率が６０％以上であり、吸水率が３．０％以下
で圧縮強度が４００ｋｇ／ｃｍ2以上の高密度フライア
ッシュ質人工骨材が得られる。The fly ash artificial aggregate is obtained by firing a granulated product containing fly ash as a main component, and various types of foam type aggregates, including commercially available products, have been proposed. There is. However, the foamed type cannot satisfy the contradictory requirements of high strength and lightness as described above, and in the present invention, for example, the applicant previously described as Japanese Patent Application No. 6-59340. The proposed granulated artificial aggregate can be preferably used. This aggregate is granulated by adding limestone powder (calcium charcoal) to fly ash as needed and adding a specified amount of bentonite and water to avoid the foamed region of this granulated product By firing in the temperature range where the temperature changes, a high density fly ash artificial aggregate with a substantially spherical actual volume ratio of 60% or more, a water absorption rate of 3.0% or less and a compressive strength of 400 kg / cm 2 or more is obtained. can get.
【００１１】この高密度フライアッシュ質人工粗骨材を
使用することにより、コンクリートの単位容積重量が
１．９〜２．２kg/lであるこの発明の好適な軽量で高強
度のコンクリートとすることができる。By using this high-density fly ash artificial coarse aggregate, the concrete has a unit volume weight of 1.9 to 2.2 kg / l and is suitable for the present invention as a lightweight and high-strength concrete. You can
【００１２】尚、粒径５ｍｍ以下の細骨材についても、
前述した密実のフライアッシュ質人工骨材を使用するこ
とができるが、既に前記フライアッシュ質人工粗骨材の
適用により、十分に軽量高強度化が達成できるものであ
り、細骨材は、川砂、山砂、砕砂等天然の細骨材を用い
ることができるものであり、特に細骨材の粒度分布がバ
ランス悪く、通常のコンクリート用骨材としては適切で
ないとされるものについても、前述したフライアッシュ
の大量使用と、ほぼ球形の実積率が６０％以上である高
密度フライアッシュ質人工粗骨材の使用及びこれに伴う
コンクリートの適性配合によって、コンクリートの流動
性を確保し、この発明の骨材として好適に使用できるも
のである。For fine aggregates with a particle size of 5 mm or less,
Although it is possible to use the above-mentioned solid fly ash quality artificial aggregate, by applying the fly ash quality artificial coarse aggregate, it is possible to achieve sufficiently lightweight and high strength, fine aggregate, Natural fine aggregates such as river sand, mountain sand, and crushed sand can be used. Especially, those that are not suitable as normal aggregates for concrete because the particle size distribution of fine aggregates is unbalanced, By using a large amount of the fly ash prepared above, and using a high density fly ash artificial coarse aggregate with an approximately spherical actual volume of 60% or more and the appropriate mix proportion of the concrete, the flowability of the concrete is ensured. It can be suitably used as the aggregate of the invention.
【００１３】次に、この発明は高性能減水剤を併用する
ことにより、単位水量の増加に起因する初期強度の低
下、乾燥収縮の増大等の欠点を排除できるばかりか、フ
ライアッシュのコンクリートへの大量混合を達成するこ
とができ、さらに、フライアッシュの大量混合によって
も初期・長期強度発現の良好なコンクリートの製造を実
現できる。Next, the present invention can eliminate defects such as a decrease in initial strength and an increase in drying shrinkage due to an increase in the amount of unit water by using a high-performance water-reducing agent, and at the same time, it can be applied to concrete of fly ash. It is possible to achieve a large amount of mixing, and it is also possible to realize the production of concrete with good initial and long-term strength development even by mixing a large amount of fly ash.
【００１４】高性能減水剤としては、従来よりコンクリ
ート用混和剤として用いられている、例えば、アルキリ
アリル系、ナフタリン系、メラミン系、トリアジン系の
化学組成を有するものであればいずれも使用できるが、
望ましくは、ポリカルボン酸塩系の混和剤が良好であ
る。もちろん、空気連行性能を有する高性能ＡＥ減水剤
の適用も可能である。この種の混和剤として、市販品に
はレオビルドＳＰ−８Ｓ（エヌ・エム・ビー製、商品
名）、マイティー２０００ＷＨＳ（花王製、商品名）チ
ューポールＨＰ−８（竹本油脂製、商品名）等を挙げる
ことができる。コンクリート１ｍ3当たりの単位セメン
ト量を所定量に保持しつつ、前記フライアッシュを増加
していくとコンクリート中の微粉体が占める体積が増大
し、コンクリートの流動性が損なわれるが、上記高性能
減水剤の添加量を適切に調整することによりコンクリー
トに所定の軟度（スランプ値）を得ることができる。高
性能減水剤の添加量は、使用するポルトランドセメン
ト、骨材、フライアッシュ及び所要の減水効果などを勘
案して調整されるが、一般には、ポルトランドセメント
１００重量部に対して、０．１〜１０重量％添加する。
これが０．１重量％未満では減水効果が実質上無く、ま
たこれを１０重量％越えて添加しても減水性、流動性の
改善効果が頭打ちとなる。As the high-performance water reducing agent, any one having a chemical composition conventionally used as an admixture for concrete, for example, an alkylylallyl type, a naphthalene type, a melamine type, or a triazine type can be used.
Desirably, a polycarboxylic acid salt-based admixture is preferable. Of course, it is possible to apply a high-performance AE water reducing agent having air entrainment performance. As this type of admixture, commercially available products include Reobuild SP-8S (manufactured by NMB, trade name), Mighty 2000 WHS (manufactured by Kao, trade name) Chupole HP-8 (manufactured by Takemoto Yushi Co., Ltd.), etc. Can be mentioned. While increasing the amount of the fly ash while maintaining the unit amount of cement per 1 m 3 of concrete at a predetermined amount, the volume occupied by fine powder in the concrete increases and the fluidity of the concrete is impaired. It is possible to obtain a predetermined softness (slump value) in concrete by appropriately adjusting the amount of the agent added. The addition amount of the high-performance water reducing agent is adjusted in consideration of the used Portland cement, aggregate, fly ash, and the required water reducing effect, but generally 0.1 to 100 parts by weight of Portland cement is used. Add 10% by weight.
If it is less than 0.1% by weight, the water-reducing effect is substantially absent, and if it is added in excess of 10% by weight, the effects of improving the water-reducing property and the fluidity reach a ceiling.
【００１５】本発明において空気連行剤は、従来よりコ
ンクリート用空気連行剤として用いられている、例えば
ノニオン系、アニオン系、オキシエチレン系、高級脂肪
酸塩系、天然樹脂酸塩系の化学組成を有するものはいず
れも使用できる。例えば、アルキルカルボン酸化合物を
主成分とするＡＥ−７７５Ｓ（エヌ・エム・ビー製、商
品名）、天然樹脂酸系のヴィンソル（山宗化学製、商品
名）、アルキルフェノール系のシーカＡＥＲ（日本シー
カ、商品名）等を挙げることができる。本発明において
は、上記空気連行剤の添加割合を調整して、コンクリー
トの空気連行量を４．５〜５．５％に調整することが望
ましい。In the present invention, the air entraining agent has a chemical composition conventionally used as an air entraining agent for concrete, for example, nonionic type, anionic type, oxyethylene type, higher fatty acid salt type, natural resin acid salt type chemical composition. Any thing can be used. For example, AE-775S (manufactured by NMB, Inc., product name) containing an alkylcarboxylic acid compound as a main component, Vinsol (manufactured by Yamamune Chemical, product name) of natural resin acid, Seeker AER (Nippon Seeker of the Alkylphenol system). , Product name) and the like. In the present invention, it is desirable to adjust the addition ratio of the air entraining agent to adjust the air entraining amount of concrete to 4.5 to 5.5%.
【００１６】尚、以上説明した配合成分のほかに、この
発明は、通常、コンクリートにおいて用いられる急硬・
急結材、高強度混和剤、水和促進剤、凝結調整剤などの
各種コンクリート混和材料や補強材としての各種繊維、
鋼等も使用できる。In addition to the above-described compounding ingredients, the present invention is also generally used in concrete for rapid hardening.
Various concrete admixture materials such as quick-setting admixtures, high-strength admixtures, hydration accelerators, setting regulators, and various fibers as reinforcing materials,
Steel or the like can also be used.
【００１７】また、前記各成分の混合及び混練方法に制
限は無く、均一に混合混練できれば良く、配合成分の添
加順序にも特に制限されるものではないが、水分量は、
水セメント比（Ｗ／Ｃ）が４５重量％以上となるように
調整する。これが４５重量％を下回ると、コンクリート
として施工上好ましい所要スランプ値８〜２２cmを確保
する上で好ましくない。Further, there is no limitation on the mixing and kneading method of each of the above components, as long as the components can be uniformly mixed and kneaded, and the addition order of the blended components is not particularly limited, but the water content is
The water cement ratio (W / C) is adjusted to be 45% by weight or more. If it is less than 45% by weight, it is not preferable for securing the required slump value of 8 to 22 cm which is preferable for concrete as a construction.
【００１８】尚、コンクリート打設後の養生は、各種の
養生方法が適用可能であり、常温養生、高温養生、常圧
蒸気養生、高温高圧養生のいずれの方法も採用でき、必
要ならば、これらの組合わせを行ってより高強度コンク
リート硬化体とすることができる。As the curing after pouring concrete, various curing methods can be applied, and any of normal temperature curing, high temperature curing, normal pressure steam curing and high temperature and high pressure curing can be adopted. Can be combined to obtain a higher strength concrete hardened body.
【００１９】[0019]
【作用】本発明に係わるコンクリートは、上述したよう
にコンクリート配合を適切に調整することにより、フラ
イアッシュを大量に使用しても、前述したフライアッシ
ュの有するコンクリートとしての優れた特性を損ねるこ
となく、又、密実な絶乾比重が１．８〜２．２の高密度
フライアッシュ質人工粗骨材の使用と相俟って、フライ
アッシュの特性を相乗効果的に発揮し、コンクリートの
ワーカビリティに優れ、初期強度及び長期強度発現の良
好なコンクリート単位容積重量が１．９〜２．２ｋｇ／
ｌ程度の軽量コンクリートとすることができる。With the concrete according to the present invention, by properly adjusting the concrete mix as described above, even if a large amount of fly ash is used, the excellent characteristics of the fly ash as concrete described above are not impaired. In addition, in combination with the use of high density fly ash artificial coarse aggregate with a solid absolute dry specific gravity of 1.8 to 2.2, the characteristics of fly ash are synergistically exerted, and concrete worker is The concrete unit volume weight with excellent stability and good initial strength and long-term strength development is 1.9 to 2.2 kg /
It can be a lightweight concrete of about l.
【００２０】[0020]
【実施例】下記に示す材料、及び表１に示すコンクリー
トの配合によってコンクリートを調整し、ＪＩＳ Ａ
１１０８に準拠して圧縮強度を測定した。養生は２０℃
水中養生とした。尚、使用したフライアッシュ質粗骨材
は、平均粒径１５μのフライアッシュに成分調整材とし
てブレーン比表面積５０００ｃｍ2／ｇの炭カル１０重
量％を加えた混合物に、ベントナイト５重量部、及び適
量の水を添加して直径５〜２０ｍｍに造粒した造粒物を
ロータリキルンで焼成して調整したものである。結果を
表１に併せて示す。（使用材料） セメント：秩父小野田セメント社製普通ポルトランドセ
メント フライアッシュ：比重２．２３、ブレーン比表面積３３
４０cm2／ｇ 細骨材：陸砂（静岡産）比重２．５９、ＦＭ２．７５ 粗骨材：フライアッシュ質人工粗骨材 比重１．８７
実積率６４％ 粗骨材：砕石（茨城産）最大寸法２０ｍｍ、比重２．６
４、実積率５９％ 高性能ＡＥ減水剤：エヌ・エム・ビー社製 レオビルド
ＳＰ−８Ｓ ＡＥ減水剤：エヌ・エム・ビー社製 ポゾリス ＮＯ．
７０ 空気連行剤 ：エヌ・エム・ビー社製 ＡＥ−７７
５Ｓ[Examples] Concrete was prepared by mixing the materials shown below and the concrete shown in Table 1 with JIS A
The compressive strength was measured according to 1108. 20 ℃
Underwater curing. The fly ash coarse aggregate used was a mixture of fly ash having an average particle size of 15 μm and 10 wt% of calcium carbide having a Blaine specific surface area of 5000 cm 2 / g as a component adjusting material, 5 parts by weight of bentonite, and an appropriate amount. The water is added and the granulated product is granulated to have a diameter of 5 to 20 mm. The results are shown in Table 1. (Materials used) Cement: Ordinary Portland cement manufactured by Chichibu Onoda Cement Co., Ltd. Fly ash: Specific gravity 2.23, Blaine specific surface area 33
40 cm 2 / g Fine aggregate: Land sand (Shizuoka) specific gravity 2.59, FM 2.75 Coarse aggregate: Fly ash artificial coarse aggregate Specific gravity 1.87
Actual volume ratio 64% Coarse aggregate: Crushed stone (made in Ibaraki) Maximum size 20 mm, Specific gravity 2.6
4, 59% actual volume ratio High-performance AE water reducing agent: NMB company Rheobuild SP-8S AE water reducing agent: NMB company Pozoris NO.
70 Air entraining agent: NM-AE AE-77
5S
【００２１】[0021]
【表１】 [Table 1]
【００２２】[0022]
【発明の効果】本発明により、初期並びに長期において
強度発現性の良好な軽量コンクリートを得ることがで
き、かつ産業副産品であるフライアッシュの大量有効活
用を図ることができる。EFFECTS OF THE INVENTION According to the present invention, lightweight concrete having good strength development in the initial and long term can be obtained, and a large amount of fly ash which is an industrial by-product can be effectively utilized.
Claims (7)
（Ｇ）、フライアッシュ（Ｆ）、及び水（Ｗ）を含むコ
ンクリート組成物であって、単位セメント量が２５０〜
３５０kg/m3 、単位フライアッシュ量が１５０〜３００
kg/m3 であり、且つ、粗骨材（Ｇ）として絶乾比重が
１．８〜２．２のフライアッシュ質人工粗骨材を用いた
ことを特徴とするコンクリート組成物。1. A concrete composition containing cement (C), fine aggregate (S), coarse aggregate (G), fly ash (F), and water (W), the unit cement amount of which is 250 to
350kg / m 3 , unit fly ash amount is 150-300
A concrete composition characterized in that a fly ash artificial coarse aggregate having a specific gravity of 1.8 to 2.2 is used as the coarse aggregate (G), which is kg / m 3 .
上であることを特徴とする請求項１記載のコンクリート
組成物。2. The concrete composition according to claim 1, wherein the water cement ratio (W / C) is 45% by weight or more.
ッシュを主要成分とした造粒物を焼成することにより得
られる人工骨材であることを特徴とする請求項１若しく
は２記載のコンクリート組成物。3. The concrete composition according to claim 1, wherein the fly ash artificial coarse aggregate is an artificial aggregate obtained by firing a granulated product containing fly ash as a main component. .
６０％以上、好ましくは６３〜７０％であることを特徴
とする請求項１〜３いずれか記載のコンクリート組成
物。4. The concrete composition according to any one of claims 1 to 3, wherein the fly ash artificial coarse aggregate has an actual volume ratio of 60% or more, preferably 63 to 70%.
２．２kg/lであることを特徴とする請求項１〜４いずれ
か記載のコンクリート組成物。5. The unit volume weight of concrete is 1.9 to
It is 2.2 kg / l, The concrete composition in any one of Claims 1-4 characterized by the above-mentioned.
する請求項１〜５いずれか記載のコンクリート組成物。6. The concrete composition according to claim 1, further comprising a high performance water reducing agent.
は早強ポルトランドセメントであることを特徴とする請
求項１〜６いずれか記載のコンクリート組成物。7. The concrete composition according to claim 1, wherein the cement is ordinary Portland cement or early-strength Portland cement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09991795A JP3628064B2 (en) | 1995-03-31 | 1995-03-31 | Concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP09991795A JP3628064B2 (en) | 1995-03-31 | 1995-03-31 | Concrete composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08277157A true JPH08277157A (en) | 1996-10-22 |
| JP3628064B2 JP3628064B2 (en) | 2005-03-09 |
Family
ID=14260139
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP09991795A Expired - Fee Related JP3628064B2 (en) | 1995-03-31 | 1995-03-31 | Concrete composition |
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| Country | Link |
|---|---|
| JP (1) | JP3628064B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007246308A (en) * | 2006-03-14 | 2007-09-27 | Tokyo Electric Power Co Inc:The | Concrete composition and method for determining composition of concrete |
| CN104261762A (en) * | 2014-09-21 | 2015-01-07 | 山东农业大学 | Hydraulic concrete made of mineral waste admixture |
| CN105218057A (en) * | 2015-11-03 | 2016-01-06 | 石河子大学 | A kind of green lightweight aggregate concrete and preparation technology thereof |
| CN105439514A (en) * | 2015-11-24 | 2016-03-30 | 鲁东大学 | High-toughness mortar for reinforcing wall adopting old masonry structure |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103992076B (en) * | 2014-05-27 | 2015-10-28 | 广西大学 | A kind of concrete mixing proportion design method invading performance and intensity index requirement based on resisting chloride ion penetration |
| CN108821689A (en) * | 2018-07-17 | 2018-11-16 | 芜湖芬特勘测服务有限公司 | A kind of modified concrete and preparation method thereof |
-
1995
- 1995-03-31 JP JP09991795A patent/JP3628064B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007246308A (en) * | 2006-03-14 | 2007-09-27 | Tokyo Electric Power Co Inc:The | Concrete composition and method for determining composition of concrete |
| CN104261762A (en) * | 2014-09-21 | 2015-01-07 | 山东农业大学 | Hydraulic concrete made of mineral waste admixture |
| CN105218057A (en) * | 2015-11-03 | 2016-01-06 | 石河子大学 | A kind of green lightweight aggregate concrete and preparation technology thereof |
| CN105218057B (en) * | 2015-11-03 | 2017-09-15 | 石河子大学 | A kind of green lightweight aggregate concrete and its preparation technology |
| CN105439514A (en) * | 2015-11-24 | 2016-03-30 | 鲁东大学 | High-toughness mortar for reinforcing wall adopting old masonry structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3628064B2 (en) | 2005-03-09 |
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