JPH11180753A - Concrete composition - Google Patents
Concrete compositionInfo
- Publication number
- JPH11180753A JPH11180753A JP35447497A JP35447497A JPH11180753A JP H11180753 A JPH11180753 A JP H11180753A JP 35447497 A JP35447497 A JP 35447497A JP 35447497 A JP35447497 A JP 35447497A JP H11180753 A JPH11180753 A JP H11180753A
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- artificial lightweight
- coal ash
- concrete composition
- pts
- 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.)
- Pending
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
- 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
- C04B18/027—Lightweight materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/29—Frost-thaw resistance
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、軽量であるだけで
なく、強度、寸法安定性、耐火性、耐凍害性にも優れた
硬化体を与えるコンクリート組成物に関するものであ
る。本発明のコンクリート組成物は、主に建築または土
木用途に好適に使用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete composition which gives a cured product which is not only lightweight but also excellent in strength, dimensional stability, fire resistance and frost damage resistance. The concrete composition of the present invention is suitably used mainly for construction or civil engineering applications.
【０００２】[0002]
【従来の技術】従来、コンクリートを軽量化するため
に、多量の気泡を直接導入したり、火山性ガラス質鉱物
を焼成・発泡させたパーライト、シラスバルーンまたは
頁岩、粘土等を焼成・発泡させた人工軽量骨材、天然軽
量骨材、発泡ポリスチレン、スチレンビーズ等の合成樹
脂発泡体等、多量の気泡を含む軽量骨材を混入させて、
間接的に気泡を導入する方法が採られている。後者の例
としては例えば、特開平８−１５７２２８号公報には黒
雲母流紋岩から製造した絶乾比重０．５〜１．２の人工
軽量骨材を粗骨材または細骨材として添加するコンクリ
ート組成物が開示されているが、同公報にも記載されて
いる様に、黒雲母流紋岩から製造した骨材は表面が滑ら
かであり、マトリックスとの付着力を高めることができ
ない。特開平８−２７７１５３号公報には、フライアッ
シュから製造した人工軽量骨材を粗骨材として使用する
技術が開示されているが、用いられている骨材の絶乾比
重が１．８〜２．２と大きく、軽量化が十分に達せられ
ない欠点を有したものである。また、特開平８−２３９
２５１号公報には、火山ガラス質鉱物から製造した人工
軽量骨材を細骨材として添加したコンクリート組成物が
開示されているが、骨材の吸水率が７％と高いためコン
クリート中の単位水量が大くきなり、結果として強度向
上には自ずと限界がある。直接的、間接的を問わず、気
泡導入によるコンクリート強度の低下は不可避であるこ
とから、強度を向上させるために、高性能減水剤を使用
して水セメント比を低くしたり、高強度用混和剤として
シリカヒュームまたは硫酸カルシウムを添加して、組成
面での改良を加える他、高温高圧養生を行なう等、処理
面での改良を加える方法が採られている。高性能減水剤
を使用して水セメント比を低くする方法では、ある程度
までは強度の向上を図ることが可能であるが、軽量骨材
は、骨材自体の強度が低いことに加え、それ自体の吸水
量が大きいため、この方法による高強度化には自ずと限
界がある。一方、高温高圧養生を施すことは、強度向上
のみならず寸法安定性向上の効果も図れるが、コストア
ップに繋がることが避けられない。2. Description of the Related Art Conventionally, in order to reduce the weight of concrete, a large amount of air bubbles have been directly introduced, or pearlite, shirasu balloon or shale, clay, etc. obtained by firing and foaming volcanic glassy minerals have been fired and foamed. By mixing lightweight aggregates containing a large amount of air bubbles such as artificial lightweight aggregates, natural lightweight aggregates, synthetic resin foams such as expanded polystyrene and styrene beads,
A method of introducing bubbles indirectly is employed. As an example of the latter, for example, Japanese Unexamined Patent Publication No. Hei 8-157228 discloses that an artificial lightweight aggregate having a bone-dry specific gravity of 0.5 to 1.2 manufactured from biotite rhyolite is added as a coarse aggregate or a fine aggregate. Although a concrete composition is disclosed, as described in the publication, the aggregate produced from biotite rhyolite has a smooth surface and cannot increase the adhesion to the matrix. Japanese Patent Application Laid-Open No. Hei 8-277153 discloses a technique in which artificial lightweight aggregate produced from fly ash is used as a coarse aggregate, but the absolute specific gravity of the aggregate used is 1.8 to 2%. .2, which has a disadvantage that the weight cannot be sufficiently reduced. Also, Japanese Patent Application Laid-Open No. 8-239
No. 251 discloses a concrete composition in which artificial lightweight aggregate produced from volcanic glassy mineral is added as fine aggregate, but the water absorption of the aggregate is as high as 7%, so that the unit water content in concrete is high. However, as a result, there is naturally a limit to improvement in strength. Regardless of direct or indirect, it is unavoidable that the concrete strength is reduced due to the introduction of air bubbles.To improve the strength, use a high-performance water reducing agent to lower the water-cement ratio or mix for high strength. In addition to adding silica fume or calcium sulfate as an agent to improve the composition, a method of improving the treatment, such as performing high-temperature and high-pressure curing, has been adopted. By using a high-performance water reducing agent to lower the water-cement ratio, it is possible to improve the strength to a certain extent.However, lightweight aggregates have low strength in addition to the low strength of the aggregate itself. Because of its large water absorption, there is naturally a limit to increasing the strength by this method. On the other hand, applying high-temperature and high-pressure curing not only improves strength but also improves dimensional stability, but inevitably leads to an increase in cost.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、従来技術が
有していた上記問題が解決されたコンクリート組成物の
提供を目的とする。具体的には、コンクリート硬化体の
圧縮強度は、コンクリート組成物の水セメント比および
硬化体の気乾単位容積質量に依存して変化するが、水セ
メント比３０％、硬化体気乾単位容積質量１．８ｋｇ／
リットルにおいて４０Ｎ／ｍｍ2 以上の圧縮強度を有
し、且つ、凍結融解抵抗性に優れた特性を有するコンク
リート硬化体を高温高圧養生を施すことなく与えるコン
クリート組成物の提供を目的とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a concrete composition which solves the above-mentioned problems of the prior art. Specifically, the compressive strength of the hardened concrete varies depending on the water-cement ratio of the concrete composition and the air-dry unit mass of the hardened body. 1.8kg /
It is an object of the present invention to provide a concrete composition which gives a hardened concrete body having a compressive strength of 40 N / mm 2 or more in liter and excellent resistance to freezing and thawing without performing high-temperature and high-pressure curing.
【０００４】[0004]
【課題を解決するための手段】本発明では、従来の人工
軽量骨材よりも絶乾比重及び吸水率が低く、且つ粗表面
を有するためマトリックスとの付着力の高い石炭灰系人
工軽量骨材を粗骨材として混入させたコンクリート組成
物が、前記課題を解決した硬化体を与えることを見出
し、本発明を完成した。すなわち、本発明は、セメント
と、粗骨材としての絶乾比重０．７〜１．４、吸水率
０．７〜１．８％の石炭灰系人工軽量骨材と、細骨材よ
り成るコンクリート組成物に関する。以下に、本発明を
説明する。According to the present invention, a coal ash-based artificial lightweight aggregate having a lower absolute dry specific gravity and a lower water absorption than a conventional artificial lightweight aggregate and having a high adhesion to a matrix due to having a rough surface. It has been found that a concrete composition in which is mixed as a coarse aggregate gives a cured product that solves the above problems, and has completed the present invention. That is, the present invention comprises a cement, a coal ash-based artificial lightweight aggregate having a bone-dry specific gravity of 0.7 to 1.4 and a water absorption of 0.7 to 1.8% as a coarse aggregate, and a fine aggregate. It relates to a concrete composition. Hereinafter, the present invention will be described.
【０００５】本発明の最大の特徴は粗骨材として使用す
る石炭灰系人工軽量骨材に在る。この人工軽量骨材は、
好ましくは未燃炭素量が１〜１５重量％の石炭灰１００
重量部に例えば石英粗面岩等の活性珪酸質粉３０〜１２
０重量部を添加・混合した後、造粒・焼成して製造され
るものであり、開気孔が少ない粗表面を有する球形の粒
子であり、従来の人工軽量骨材に比して絶乾比重および
吸水率が夫々０．７〜１．４、０．７〜１．８％と低
く、且つ強度が高い。特に、表面が粗いため、シラスバ
ルーンや黒曜石から製造したパーライト等の、ガラス質
の滑らかな表面を有するものに比べてセメントペースト
との付着力が大きく、本人工軽量骨材を粗骨材として用
いることにより、従来の人工軽量骨材を粗骨材として使
用したコンクリート組成物では得られない、軽量且つ高
強度の硬化体を得ることができる。The most important feature of the present invention lies in a coal ash-based artificial lightweight aggregate used as a coarse aggregate. This artificial lightweight aggregate,
Preferably, coal ash 100 having an unburned carbon content of 1 to 15% by weight
An active siliceous powder such as quartz rough rock 30 to 12 parts by weight
It is manufactured by adding and mixing 0 parts by weight, and then granulating and firing. It is a spherical particle having a rough surface with few open pores. And the water absorption is as low as 0.7 to 1.4 and 0.7 to 1.8%, respectively, and the strength is high. In particular, because the surface is rough, such as perlite manufactured from shirasu balloon and obsidian, the adhesive force with cement paste is larger than that having a vitreous smooth surface, and the artificial lightweight aggregate is used as coarse aggregate. This makes it possible to obtain a lightweight and high-strength cured product that cannot be obtained with a concrete composition using a conventional artificial lightweight aggregate as a coarse aggregate.
【０００６】本発明のコンクリート組成物は、上記人工
軽量骨材を粗骨材としてセメントと混合して調製される
が、セメントとしては、普通、早強、超早強、中庸熱、
耐硫酸塩、低熱の各ポルトランドセメントや、高炉スラ
グセメント、フライアッシュセメントおよびシリカセメ
ント等の各種混合セメントを用いることができる。[0006] The concrete composition of the present invention is prepared by mixing the above-mentioned artificial lightweight aggregate as coarse aggregate with cement, and the cement is usually, fast, super fast, moderate heat,
Various mixed cements such as sulfate resistant and low heat Portland cement, blast furnace slag cement, fly ash cement and silica cement can be used.
【０００７】粗骨材としての人工軽量骨材の添加量は、
コンクリート組成物１００容量部当たり１０〜６０容量
部、好ましくは２０〜５０容量部とするのが良い。粗骨
材としての人工軽量骨材の添加量が１０容量部より少な
いとマトリックス部が多くなり、硬化後の寸法安定性に
劣る硬化体が得られることが在り、一方、６０容量部よ
り大であると流動性が低下するため、成形が困難に成る
虞が在る。[0007] The amount of artificial lightweight aggregate added as coarse aggregate is
It is 10 to 60 parts by volume, preferably 20 to 50 parts by volume, per 100 parts by volume of the concrete composition. If the amount of the artificial lightweight aggregate as the coarse aggregate is less than 10 parts by volume, the matrix portion increases, and a cured body having poor dimensional stability after curing may be obtained. If there is, the fluidity is reduced, and there is a possibility that molding becomes difficult.
【０００８】本発明のコンクリート組成物には更に細骨
材を添加する。細骨材の添加量は、コンクリート組成物
１００容量部当たり１０〜６０、好ましくは２０〜５０
容量部とするのが良い。この範囲を外れると、粗骨材の
場合同様、硬化後の寸法安定性に劣る硬化体が得られた
り、流動性が低下して成形が困難に成る虞が在る。細骨
材としては、川砂、砕砂、スラグ骨材等の普通骨材の
他、頁岩、粘土、廃ガラス石炭灰を原料として製造され
た人工軽量骨材を使用することができる。[0008] Fine aggregate is further added to the concrete composition of the present invention. The added amount of the fine aggregate is 10 to 60, preferably 20 to 50 per 100 parts by volume of the concrete composition.
It is good to make it a capacity part. Outside of this range, as in the case of coarse aggregate, there is a possibility that a cured product having inferior dimensional stability after curing may be obtained or molding may be difficult due to reduced fluidity. As the fine aggregate, in addition to ordinary aggregates such as river sand, crushed sand, and slag aggregate, artificial lightweight aggregates manufactured using shale, clay, and waste glass coal ash as raw materials can be used.
【０００９】本発明におけるコンクリート組成物には、
上記したセメント、粗骨材及び細骨材より成る必須成分
に加えて、コンクリート製品製造の際に一般的に使用さ
れる、高炉スラグ、フライアッシュ、シリカフューム等
の各種無機質微粉末混和材料、ＡＥ減水剤、高性能減水
剤、高性能ＡＥ減水剤等の減水剤、ＡＥ剤、起泡剤、膨
張剤、凝結速度調節剤等の各種混和剤を必要に応じて一
般的に使われている量を添加することができる。特に、
減水剤の添加は、スラリー流動性の改善に繋がるのみな
らず、水セメント比の低減を可能にし、硬化体の強度向
上に非常に好ましい効果をもたらす。The concrete composition of the present invention includes:
In addition to the above essential components consisting of cement, coarse aggregate and fine aggregate, various inorganic fine powder admixed materials such as blast furnace slag, fly ash, silica fume and the like, which are generally used in the manufacture of concrete products, and AE water reduction Agents, high-performance water reducing agents, water-reducing agents such as high-performance AE water reducing agents, and various admixtures such as AE agents, foaming agents, swelling agents, and setting speed regulators. Can be added. Especially,
The addition of the water reducing agent not only leads to an improvement in the fluidity of the slurry, but also makes it possible to reduce the water-cement ratio, and has a very favorable effect on improving the strength of the cured product.
【００１０】細骨材中における粒径０．３ｍｍ以下の粒
分が少ない場合に、スラリー流動性が十分発現せず作業
特性が低下することがあるが、この場合には、発泡ポリ
スチレン、シラスバルーン等の合成樹脂または無機質発
泡体や石灰石粉、砕石粉等の無機質微粉末を添加した
り、公知の起泡剤を添加して気泡を直接導入することに
より、流動性を上げ作業特性を向上させると共に材料分
離も抑制され、非常に好ましい結果を得ることができ
る。When the amount of particles having a particle diameter of 0.3 mm or less in the fine aggregate is small, the slurry fluidity may not be sufficiently exhibited and the working characteristics may be deteriorated. In this case, expanded polystyrene, shirasu balloon By adding a synthetic resin such as an inorganic foam or an inorganic fine powder such as limestone powder or crushed stone powder, or by adding a known foaming agent and directly introducing bubbles, the fluidity is increased and the working characteristics are improved. At the same time, material separation is suppressed, and a very favorable result can be obtained.
【００１１】本発明のコンクリート組成物は、鋼繊維、
ガラス繊維、炭素繊維等の各種繊維を補強材として添加
して硬化体の曲げ強度を更に向上させることも可能であ
り、使用目的に合せて適宜採用することができる。The concrete composition of the present invention comprises a steel fiber,
It is also possible to further improve the bending strength of the cured product by adding various fibers such as glass fiber and carbon fiber as a reinforcing material, and it can be appropriately adopted according to the purpose of use.
【００１２】本発明のコンクリート組成物は、その液状
成分以外の全成分を予め混合して置き使用に際して液状
成分および水を加えてスラリー化しても良いし、予め調
製した複数成分の混合物に残りの成分および水を加えて
も、更には、使用に際して個別の各成分および水を加え
てスラリー化しても良い。The concrete composition of the present invention may be prepared by mixing all the components other than the liquid component in advance, and adding the liquid component and water at the time of use to form a slurry. Ingredients and water may be added, and further, individual components and water may be added for use to form a slurry.
【００１３】[0013]
【実施例】以下に具体的例を挙げて、本発明を更に詳し
く説明する。 実施例１〜４０及び比較例１〜４ （１）粗骨材としての石炭灰系人工軽量骨材 未燃炭素９．２重量％の石炭灰１００重量部に活性珪酸
質としての石英粗面岩粉を１００重量部加えた原料粉末
に水５重量部を添加し、磁製ポットミルで混合した後、
加圧成形して１０ｍｍ径の造粒物を得た。造粒物を昇温
プログラム付き電気炉を用いて昇温速度２０℃／分で昇
温し、１２００℃及び１３００℃で３０分間焼成して夫
々ＦＡＬ、ＦＡＭと呼ぶ二種の人工軽量骨材を得た。得
られた人工軽量骨材の絶乾比重は、ＦＡＭ：１．３、Ｆ
ＡＬ：０．９であり、吸水率は、ＦＡＭ：０．７％、Ｆ
ＡＬ：１．７％であった。 （２）コンクリート組成物の調製 コンクリート組成物の調製に当たって使用した原料を表
１に示す。セメントおよび骨材を表２に示す配合比で配
合したものを強制混合機を用いて３０秒間空練りした
後、夫々表２に示す量の混和剤および水を加え、更に９
０秒間混練・混合し、コンクリート組成物を得た。 （３）硬化体の調製 混練・混合後のコンクリート組成物は、径１００ｍｍ×
高さ２００ｍｍの鋼鉄製の円柱状型枠に入れ、２４時間
養生した後、型枠から取り出し、供試体とした。 （４）硬化体の評価：圧縮強度 圧縮強度は、ＪＩＳ Ａ １１３４に則って測定した。 （５）硬化体の評価：気乾単位容積質量 型枠から取り出した供試体を大気中２０℃、相対湿度８
０％の条件下で２８日間乾燥させた後、その質量を測定
し、測定値を、寸法から分かっている容積で除して求め
た。水セメント比及び気乾単位容積質量に対する圧縮強
度の変化を夫々図１、図２に示す。 （６）硬化体の評価：凍結融解試験 実施例１および比較例１に示すコンクリート組成物から
調製した硬化体について、ＪＩＳ Ａ ６２０４「コン
クリート用化学混和剤」の付属書２（コンクリートの凍
結融解試験方法）に則った凍結融解試験を行なった。凍
結融解試験の結果を図３に示す。The present invention will be described in more detail with reference to specific examples. Examples 1 to 40 and Comparative Examples 1 to 4 (1) Coal ash-based artificial lightweight aggregate as coarse aggregate 100% by weight of coal ash containing 9.2% by weight of unburned carbon, quartz trachyte as active silicate After adding 5 parts by weight of water to the raw material powder obtained by adding 100 parts by weight of the powder and mixing with a porcelain pot mill,
Pressure molding was performed to obtain a granulated product having a diameter of 10 mm. The granulated material is heated at a heating rate of 20 ° C./min using an electric furnace with a heating program, and baked at 1200 ° C. and 1300 ° C. for 30 minutes to produce two types of artificial lightweight aggregates called FAL and FAM, respectively. Obtained. The absolute dry specific gravity of the obtained artificial lightweight aggregate was FAM: 1.3, F
AL: 0.9, water absorption rate: FAM: 0.7%, F:
AL: 1.7%. (2) Preparation of concrete composition Table 1 shows the raw materials used in preparing the concrete composition. Cement and aggregate mixed at the mixing ratios shown in Table 2 were kneaded with a forced mixer for 30 seconds, and then the amounts of admixture and water shown in Table 2 were added, respectively, followed by 9 parts.
Kneading and mixing were performed for 0 seconds to obtain a concrete composition. (3) Preparation of cured product The concrete composition after kneading and mixing has a diameter of 100 mm ×
It was placed in a steel cylindrical mold having a height of 200 mm, cured for 24 hours, and then removed from the mold to obtain a test specimen. (4) Evaluation of cured product: compressive strength The compressive strength was measured according to JIS A 1134. (5) Evaluation of cured product: Air-dried unit volume mass A specimen taken out of the mold was placed in the atmosphere at 20 ° C. and a relative humidity of 8
After drying under 0% conditions for 28 days, the mass was measured and the measured value was determined by dividing by the volume known from the dimensions. Changes in the compressive strength with respect to the water-cement ratio and the air-dry unit mass per unit volume are shown in FIGS. 1 and 2, respectively. (6) Evaluation of Cured Body: Freeze-Thaw Test For the cured body prepared from the concrete composition shown in Example 1 and Comparative Example 1, annex 2 of JIS A 6204 “Chemical admixture for concrete” (freeze-thaw test of concrete) Method)). FIG. 3 shows the results of the freeze-thaw test.
【００１４】[0014]
【表１】 [Table 1]
【００１５】[0015]
【表２】 [Table 2]
【００１６】表２及び図１に示すように、石炭灰を出発
原料とする特殊な人工軽量骨材を粗骨材として含む本発
明のコンクリ−ト組成物は、水セメント比（Ｗ／Ｃ％）
が同一であれば、一般に使用されている膨張頁岩系軽量
骨材を粗骨材として含有するコンクリート組成物より、
気乾単位容積質量が小さく、且つ圧縮強度の高い硬化体
を与える。また、図２より、硬化体の気乾単位容積質量
が同一であれば、本発明のコンクリート組成物は、一般
に使用されている膨張頁岩系軽量骨材を粗骨材として含
有するコンクリート組成物より、高強度の硬化体を与え
ることが分かる。As shown in Table 2 and FIG. 1, the concrete composition of the present invention containing a special artificial lightweight aggregate starting from coal ash as a coarse aggregate has a water-cement ratio (W / C%). )
If the same, than a concrete composition containing a commonly used expanded shale-based lightweight aggregate as a coarse aggregate,
A cured product having a small air-dry mass per unit volume and high compressive strength is provided. Further, from FIG. 2, if the air-dried unit volume mass of the cured body is the same, the concrete composition of the present invention is more effective than a concrete composition containing a generally used expanded shale-based lightweight aggregate as a coarse aggregate. It can be seen that a high strength cured product is provided.
【００１７】図３は、凍結融解試験の結果を示したもの
であるが、吸水率の低い本発明のコンクリート組成物が
２６０サイクル時点においても９０％以上の相対動弾性
係数を示しているのに対し、一般に使用されている膨張
頁岩系軽量骨材を粗骨材として含有するコンクリート組
成物を使用した高吸水率のものでは、試験開始直後から
動弾性係数の急激な低下を示し、６０サイクル時点で２
０％以下にまで低下している。すなわち、本発明のコン
クリート組成物は、優れた凍結融解抵抗性能を示すこと
が分かる。FIG. 3 shows the results of the freeze-thaw test. The concrete composition of the present invention having a low water absorption shows a relative dynamic elastic modulus of 90% or more even at 260 cycles. On the other hand, those with a high water absorption using a concrete composition containing a generally used expanded shale-based lightweight aggregate as a coarse aggregate showed a sharp decrease in the kinetic elasticity immediately after the start of the test. 2
It has decreased to 0% or less. That is, it is understood that the concrete composition of the present invention exhibits excellent freeze-thaw resistance performance.
【００１８】[0018]
【発明の効果】コンクリート組成物に要求される水セメ
ント比は、対象とするコンクリート構造物によって変わ
るが、本発明のコンクリート組成物は、同一水セメント
比において、従来使用されていたコンクリート組成物に
比してより軽量で、且つ圧縮強度の高い硬化体を与え
る。また、優れた凍結融解抵抗性能を示し、軽量骨材を
用いたコンクリートでは課題であった寒冷地における耐
久性も大幅に改善されている。従って、選択できる使用
場面が拡がり、建築ないしは土木分野におけるその利用
価値は大である。The water-cement ratio required for the concrete composition varies depending on the concrete structure to be treated. However, the concrete composition of the present invention is different from the concrete composition conventionally used at the same water-cement ratio. A cured product having a lighter weight and a higher compressive strength is provided. In addition, it shows excellent freeze-thaw resistance performance, and the durability in cold regions, which was a problem with concrete using lightweight aggregate, has been greatly improved. Therefore, the use scenes that can be selected are expanded, and its utility value in the field of construction or civil engineering is great.
【図１】組成物の水セメント比と硬化体圧縮強度間の関
係を、異なる２種の粗骨材を用いた硬化体について比較
したものである。FIG. 1 is a comparison of the relationship between the water-cement ratio of a composition and the compressive strength of a hardened material for a hardened material using two different types of coarse aggregates.
【図２】硬化体の気乾単位容積質量と圧縮強度間の関係
を、異なる２種の粗骨材を用いた硬化体について比較し
たものである。FIG. 2 is a comparison of the relationship between the air-dry unit mass per unit mass and the compressive strength of a cured product using two different types of coarse aggregates.
【図３】硬化体の凍結融解試験結果を、異なる２種の粗
骨材を用いた硬化体について比較したものである。FIG. 3 shows a comparison between the results of a freeze-thaw test of a cured product using two different types of coarse aggregates.
Claims (3)
７〜１．４、吸水率０．７〜１．８％の石炭灰系人工軽
量骨材と、細骨材より成るコンクリート組成物。(1) Cement and an absolute dry specific gravity of 0.1 as coarse aggregate.
A concrete composition comprising a coal ash-based artificial lightweight aggregate having a water absorption of 7 to 1.4 and a water absorption of 0.7 to 1.8%, and a fine aggregate.
粗骨材１０〜６０容量部、細骨材１０〜６０容量部を加
えて成る、請求項１に記載のコンクリート組成物。2. The main component is based on 100 parts by volume of cement.
The concrete composition according to claim 1, wherein 10 to 60 parts by volume of coarse aggregate and 10 to 60 parts by volume of fine aggregate are added.
燃炭素量が１〜１５重量％の石炭灰１００重量部に対し
て、活性珪酸質粉３０〜１２０重量部を配合した後、１
１５０〜１３５０℃で焼成したものである、請求項１ま
たは２に記載のコンクリート組成物。3. An artificial lightweight aggregate of coal ash, which is a coarse aggregate, comprising 30 to 120 parts by weight of activated siliceous powder per 100 parts by weight of coal ash having an unburned carbon content of 1 to 15% by weight. After that, 1
The concrete composition according to claim 1, which is fired at 150 to 1350 ° C. 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35447497A JPH11180753A (en) | 1997-12-24 | 1997-12-24 | Concrete composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35447497A JPH11180753A (en) | 1997-12-24 | 1997-12-24 | Concrete composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11180753A true JPH11180753A (en) | 1999-07-06 |
Family
ID=18437814
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35447497A Pending JPH11180753A (en) | 1997-12-24 | 1997-12-24 | Concrete composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11180753A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101105254B1 (en) * | 2011-07-14 | 2012-01-17 | 주식회사 삼표 | High stiffness concrete composition comprising silicate aggregate |
| CN114605126A (en) * | 2022-04-08 | 2022-06-10 | 石家庄金隅混凝土有限公司 | Self-compacting concrete prepared from extra-fine tailings sand |
-
1997
- 1997-12-24 JP JP35447497A patent/JPH11180753A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101105254B1 (en) * | 2011-07-14 | 2012-01-17 | 주식회사 삼표 | High stiffness concrete composition comprising silicate aggregate |
| CN114605126A (en) * | 2022-04-08 | 2022-06-10 | 石家庄金隅混凝土有限公司 | Self-compacting concrete prepared from extra-fine tailings sand |
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