JP2000264699A - Lightweight aggregate concrete - Google Patents
Lightweight aggregate concreteInfo
- Publication number
- JP2000264699A JP2000264699A JP11068051A JP6805199A JP2000264699A JP 2000264699 A JP2000264699 A JP 2000264699A JP 11068051 A JP11068051 A JP 11068051A JP 6805199 A JP6805199 A JP 6805199A JP 2000264699 A JP2000264699 A JP 2000264699A
- Authority
- JP
- Japan
- Prior art keywords
- lightweight aggregate
- water
- weight
- concrete
- aggregate
- 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.)
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- 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、例えば高層ＲＣビ
ルの柱や梁などの建築構造部材、カーテンウォール等の
建築非構造部材、鉄道橋や道路橋などの土木構造物にお
ける上部構造ならびに下部構造に適用される軽量骨材コ
ンクリート、特に凍結融解が問題となる寒冷地において
も十分な耐久性を有する軽量骨材コンクリートに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an upper structure and a lower structure of a structural member such as a pillar or a beam of a high-rise RC building, a non-structural member such as a curtain wall, and a civil structure such as a railway bridge or a road bridge. The present invention relates to a lightweight aggregate concrete applied to a concrete, particularly to a lightweight aggregate concrete having sufficient durability even in a cold region where freezing and thawing becomes a problem.
【０００２】[0002]
【発明が解決しようとする課題】軽量骨材コンクリート
は、普通骨材コンクリートと異なり、軽量骨材の吸水現
象（最終的には、吸水率が２０〜３０重量％に達すると
言われたりしている。）によって、コンクリートの混練
から打設までの軽量骨材コンクリートの製造中にコンク
リートの流動性が失われる問題がある。The light-weight aggregate concrete is different from the ordinary aggregate concrete in that the light-absorbing phenomenon of the light-weight aggregate (finally, it is said that the water absorption rate reaches 20 to 30% by weight) There is a problem that the fluidity of concrete is lost during the production of lightweight aggregate concrete from kneading to casting of concrete.
【０００３】そこで、この問題を解決する為、予め、軽
量骨材に散水を行って事前吸水を行わしめ、軽量骨材を
十分に事前吸水させた上で軽量骨材コンクリートを製造
することが提案されている。しかし、上記のように十分
に事前吸水させた軽量骨材を用いたコンクリートについ
て、その急速水中凍結融解試験（ＡＳＴＭ Ｃ６６６
Ａ法に準拠）により耐凍害性の評価を行うと、早い凍結
融解サイクル数で相対動弾性係数が低下し、耐凍害性が
良くないと判定される。[0003] In order to solve this problem, it has been proposed that the lightweight aggregate be preliminarily water-absorbed by spraying water on the lightweight aggregate, and that the lightweight aggregate be sufficiently absorbed in advance to produce lightweight aggregate concrete. Have been. However, as for the concrete using the lightweight aggregate which has been sufficiently pre-absorbed as described above, the rapid underwater freeze-thaw test (ASTM C666)
When the frost damage resistance is evaluated according to Method A), the relative kinematic elasticity coefficient decreases at a fast freeze-thaw cycle number, and it is determined that the frost damage resistance is not good.
【０００４】ところで、耐凍害性に優れた軽量骨材コン
クリートとする為には、軽量骨材コンクリート打設時に
おける軽量骨材の含水率を１０重量％以下、好ましくは
６重量％以下とすることが望ましいと言われている。そ
こで、軽量骨材コンクリートの製造に際して、軽量骨材
コンクリート打設時における軽量骨材の含水率を１０重
量％以下に保持し、かつ、コンクリートの流動性を設計
範囲内のものに保持する方法として、含水率が２０重量
％程度の軽量骨材を一旦乾燥し、混練直前に散水して軽
量骨材を表面乾燥飽和状態（骨材の粒の内部が水で満た
されているものの、表面は乾燥状態）に保って混練する
とか、軽量骨材の製造から出荷までの段階で含水率が１
０重量％以下となるようにし、混練直前に散水すると
か、一定時間水中に浸漬して表面乾燥飽和状態に保ち、
混練する等の方法が提案されている。[0004] In order to obtain lightweight aggregate concrete having excellent frost damage resistance, the water content of the lightweight aggregate at the time of casting the lightweight aggregate concrete should be 10% by weight or less, preferably 6% by weight or less. Is said to be desirable. Therefore, when manufacturing lightweight aggregate concrete, as a method of maintaining the water content of the lightweight aggregate at the time of casting the lightweight aggregate at 10% by weight or less and maintaining the fluidity of the concrete within the design range. The lightweight aggregate having a water content of about 20% by weight is once dried, and water is sprayed immediately before kneading to dry the surface of the lightweight aggregate (the interior of the aggregate particles is filled with water, but the surface is dried. Kneading while maintaining the condition), or a water content of 1
0% by weight or less, watering immediately before kneading or immersing in water for a certain period of time to keep the surface dry and saturated,
Methods such as kneading have been proposed.
【０００５】しかし、これらの方法は、軽量骨材を乾燥
したり、散水したり、一定時間水中に浸漬したり、軽量
骨材を表面乾燥飽和状態に調節したり、表面水を測定し
て混練水を調節したりと言った煩瑣な作業が必要であ
り、現実にあっては、到底に、実施し難い。この問題を
解決するものとして、軽量骨材に混練水やセメントを加
えて混練する軽量骨材コンクリートの製造方法におい
て、含水率１％以下の軽量骨材を用い、混練開始から打
設までの間に上記軽量骨材が吸水する水量を予め上記混
練水に加えて混練するようにしたことを特徴とする軽量
骨材コンクリートの製造方法が提案（特開平２−１２７
２７号公報）されている。[0005] However, in these methods, the lightweight aggregate is dried, sprinkled, immersed in water for a certain period of time, the lightweight aggregate is adjusted to a surface dry saturated state, and the surface water is measured and kneaded. Complicated work such as adjusting water is necessary, and in reality, it is very difficult to carry out. In order to solve this problem, in a method for producing lightweight aggregate concrete in which mixing water or cement is added to lightweight aggregate, a lightweight aggregate having a water content of 1% or less is used, and from the start of kneading to the time of casting. A method for producing lightweight aggregate concrete, characterized in that the amount of water absorbed by the above-mentioned lightweight aggregate is previously added to the above-mentioned kneading water and then kneaded (JP-A-2-127).
No. 27).
【０００６】しかし、この提案の技術においても、軽量
骨材が吸水するであろう水量を予め予測し、この予測水
量をプラスした形態で混練水に加えておくものであるか
ら、依然として、作業は煩瑣であり、又、特に吸水性の
高い軽量骨材の場合においては、骨材の品質のバラツキ
も大きいと考えられることから、打設時の骨材の含水率
が１０％以下であることを保証することは難しい。。However, even in this proposed technique, the amount of water that the lightweight aggregate will absorb will be predicted in advance, and the predicted amount of water will be added to the kneading water in a plus form. In the case of a lightweight aggregate having high water absorption, it is considered that the quality of the aggregate varies widely. Therefore, it is necessary that the water content of the aggregate at the time of casting is 10% or less. It is difficult to guarantee. .
【０００７】従って、本発明が解決しようとする課題
は、混練水の管理が簡単で、作業性に優れ、更には寒冷
地における耐久性に優れ、耐凍害性を有する軽量骨材コ
ンクリートを提供することである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lightweight aggregate concrete which has a simple management of kneading water, is excellent in workability, has excellent durability in a cold region, and has frost damage resistance. That is.
【０００８】[0008]
【課題を解決するための手段】上記の課題は、軽量骨材
と水とセメントとを用いた軽量骨材コンクリートにおい
て、前記軽量骨材は、絶乾比重が０．７〜１．５で、か
つ、２４時間吸水率が０〜５重量％の軽量骨材であり、
水セメント比は２５〜４０重量％であることを特徴とす
る軽量骨材コンクリートによって解決される。An object of the present invention is to provide a lightweight aggregate concrete using lightweight aggregate, water and cement, wherein the lightweight aggregate has an absolute dry specific gravity of 0.7 to 1.5, And, it is a lightweight aggregate having a water absorption of 0 to 5% by weight for 24 hours,
The problem is solved by lightweight aggregate concrete, characterized in that the water cement ratio is between 25 and 40% by weight.
【０００９】特に、軽量骨材と水とセメントとを用いた
軽量骨材コンクリートにおいて、前記軽量骨材は、絶乾
比重が０．７〜１．５で、かつ、２４時間吸水率が０〜
５重量％であり、更に混練開始時の含水率が０〜５重量
％の軽量骨材であり、水セメント比は２５〜４０重量％
であることを特徴とする軽量骨材コンクリートによって
解決される。In particular, in a lightweight aggregate concrete using a lightweight aggregate, water and cement, the lightweight aggregate has an absolute dry specific gravity of 0.7 to 1.5 and a water absorption of 0 to 24 hours.
It is a lightweight aggregate having a water content of 0 to 5% by weight at the start of kneading, and a water cement ratio of 25 to 40% by weight.
The problem is solved by lightweight aggregate concrete.
【００１０】すなわち、絶乾比重が０．７〜１．５の軽
量骨材を用いた軽量骨材コンクリートにおいて、２４時
間吸水率が０〜５重量％の軽量骨材を用いた場合、軽量
骨材の吸水量は小さいから、予め、散水を行って吸水を
行わせておくことによって混練から打設までの間におけ
る吸水を防止する必要はなくなり、又、吸水によるコン
クリートの流動性の低下と言うことも起きず、作業性は
大幅に向上する。That is, in a lightweight aggregate concrete using a lightweight aggregate having a bone-dry specific gravity of 0.7 to 1.5, when a lightweight aggregate having a water absorption of 0 to 5% by weight for 24 hours is used, Since the amount of water absorption of the material is small, it is not necessary to prevent water absorption from kneading to casting by spraying water in advance, and it is said that the fluidity of concrete is reduced by water absorption. Nothing happens and workability is greatly improved.
【００１１】又、予め、散水により吸水せしめて高含水
率の軽量骨材にしたものでないから、特に含水率は０〜
５重量％としていることから、その急速水中凍結融解試
験（ＡＳＴＭ Ｃ６６６ Ａ法に準拠）により耐凍害性
の評価を行っても、相対動弾性係数の低下は遅く、耐凍
害性は良い。絶乾比重が０．７〜１．５の軽量骨材とし
たのは、絶乾比重が０．７未満のものであると、骨材と
モルタルとの比重差が大きく、材料分離が起き易く、コ
ンクリートの打込みに際して作業性が低下し、又、軽量
骨材がコンクリート中で偏在しがちなものとなり、この
為に軽量骨材が偏在した部分から凍害劣化が進行し易く
なるからである。そして、１．５以下としたのは、これ
より大きくなると、コンクリートの軽量化が図れ難くな
るからである。好ましくは、絶乾比重が０．７５〜１．
３である。[0011] Further, since it is not made into a lightweight aggregate having a high water content by previously absorbing water by water sprinkling, the water content is particularly 0 to 0.
Since the content is set to 5% by weight, even if the frost damage resistance is evaluated by a quick water freeze-thaw test (based on the method of ASTM C666A), the relative dynamic elastic modulus decreases slowly and the frost damage resistance is good. The light weight aggregate having the absolute dry specific gravity of 0.7 to 1.5 is that if the absolute dry specific gravity is less than 0.7, the specific gravity difference between the aggregate and the mortar is large, and material separation easily occurs. This is because the workability is reduced when the concrete is poured, and the lightweight aggregate tends to be unevenly distributed in the concrete, so that the frost damage deterioration easily progresses from the portion where the lightweight aggregate is unevenly distributed. The reason why the ratio is set to 1.5 or less is that if it is larger than 1.5, it is difficult to reduce the weight of the concrete. Preferably, the absolute dry specific gravity is 0.75 to 1.
3.
【００１２】上記特徴の軽量骨材を用いた場合でも、水
セメント比が２５〜４０重量％の範囲からずれた場合、
本発明が奏する耐凍害性の特長が奏されなかったことか
ら、水セメント比は２５〜４０重量％とすることが大事
である。すなわち、水セメント比を４０重量％以下とし
た場合には、軽量骨材とセメントペーストとの界面に存
在する遷移帯の厚さが小さくなり、水の凍結が生じ易い
粗大な空隙や気泡の量が減らせられ、耐凍害性が良くな
る。水セメント比を２５重量％以上としたのは、２５重
量％未満の低すぎる場合には、コンクリートの流動性が
悪く、作業性が低下するからである。特に好ましくは、
２８〜３５重量％である。Even when the lightweight aggregate having the above characteristics is used, when the water cement ratio deviates from the range of 25 to 40% by weight,
It is important that the water-cement ratio be 25 to 40% by weight because the advantage of the frost damage resistance exhibited by the present invention was not exhibited. That is, when the water-cement ratio is set to 40% by weight or less, the thickness of the transition zone existing at the interface between the lightweight aggregate and the cement paste becomes small, and the amount of coarse voids and air bubbles in which water freezes easily occurs. And frost damage resistance is improved. The reason why the water-cement ratio is set to 25% by weight or more is that when the water-cement ratio is too low, less than 25% by weight, the fluidity of the concrete is poor and the workability is reduced. Particularly preferably,
28 to 35% by weight.
【００１３】尚、軽量骨材の２４時間吸水率は０〜４．
５重量％のものが好ましい。更に好ましくは０〜４．０
重量％のものである。但し、格別な処理を施さない限
り、現実的には、０％より大きい。又、混練開始時の含
水率は０〜５重量％の軽量骨材が好ましいのであるが、
更に好ましくは０〜４．５重量％、特に０〜４．０重量
％のものである。The light-weight aggregate has a 24-hour water absorption of 0-4.
Preferably it is 5% by weight. More preferably, 0 to 4.0.
% By weight. However, it is practically larger than 0% unless special processing is performed. Also, the moisture content at the start of kneading is preferably a lightweight aggregate of 0 to 5% by weight.
More preferably, it is 0 to 4.5% by weight, particularly 0 to 4.0% by weight.
【００１４】又、軽量骨材は圧壊強度が８００Ｎ以上の
ものが好ましい。すなわち、軽量骨材自体の強度は、軽
量骨材コンクリートの強度に影響を与える他、コンクリ
ートの凍害劣化形態の一つであるポップアウト（骨材中
の水分凍結により骨材自体が圧壊してコンクリート表面
が剥落する現象）とも関係しており、圧壊強度が８００
Ｎ以上の軽量骨材を用いた場合、ポップアウトは生じ難
くなるからである。すなわち、圧壊強度が８００Ｎ以上
の軽量骨材を用いた場合、より優れた耐久性が得られ
る。The lightweight aggregate preferably has a crushing strength of 800 N or more. In other words, the strength of the lightweight aggregate itself affects the strength of the lightweight aggregate concrete, and pop-out (one of the forms of frost damage deterioration of concrete) Crushing strength of 800
This is because popout hardly occurs when N or more lightweight aggregates are used. That is, when a lightweight aggregate having a crush strength of 800 N or more is used, more excellent durability can be obtained.
【００１５】又、軽量骨材コンクリートは連行空気量が
４〜７容積％（望ましくは５容積％以上）のものが好ま
しい。すなわち、連行空気量が４〜７容積％、特に５〜
７容積％のものにした場合、より優れた耐凍害性が得ら
れる。そして、軽量骨材コンクリートはフレッシュ時に
おける空気量の管理が非常に困難であったが、上記の骨
材は加圧による吸水が少ない為、事前に骨材の加圧吸水
特性を把握しておけば、空気量の管理に圧力法の適用も
可能になる。The lightweight aggregate concrete preferably has an entrained air volume of 4 to 7% by volume (preferably 5% by volume or more). That is, the entrained air volume is 4 to 7% by volume,
When the content is 7% by volume, more excellent frost damage resistance can be obtained. It was very difficult to control the amount of air in the lightweight aggregate concrete at the time of freshness.However, since the above-mentioned aggregates absorb little water due to pressurization, it is necessary to grasp the pressure absorption characteristics of the aggregates in advance. If this is the case, the pressure method can be applied to control the amount of air.
【００１６】又、軽量骨材コンクリートは、特に、凍結
融解サイクル数が３００回における相対動弾性係数が８
０％以上のものが好ましい。The lightweight aggregate concrete has a relative dynamic elastic modulus of 8 particularly at a freeze-thaw cycle number of 300 times.
Those having 0% or more are preferable.
【００１７】[0017]
【発明の実施の形態】本発明の耐凍害性を有する軽量骨
材コンクリートは、軽量骨材（特に、粗骨材）と水とセ
メントとを用いた軽量骨材コンクリートにおいて、前記
軽量骨材（特に、粗骨材）は、絶乾比重が０．７〜１．
５（特に、０．７５〜１．３）で、かつ、２４時間吸水
率が０〜５重量％（望ましくは、０〜４．５重量％。特
に、０〜４．０重量％）の軽量骨材（特に、粗骨材）で
あり、水セメント比は２５〜４０重量％（特に、２８〜
３５重量％）である。特に、軽量骨材（特に、粗骨材）
と水とセメントとを用いた軽量骨材コンクリートにおい
て、前記軽量骨材（特に、粗骨材）は、絶乾比重が０．
７〜１．５（特に、０．７５〜１．３）で、かつ、２４
時間吸水率が０〜５重量％（望ましくは、０〜４．５重
量％。特に、０〜４．０重量％）であり、更に混練開始
時の含水率が０〜５重量％（望ましくは、０〜４．５重
量％。特に、０〜４．０重量％）の軽量骨材（特に、粗
骨材）であり、水セメント比は２５〜４０重量％（特
に、２８〜３５重量％）である。軽量骨材（特に、粗骨
材）は、その圧壊強度が８００Ｎ以上（特に、１０００
Ｎ以上）のものである。前記軽量骨材コンクリートは、
その連行空気量が４〜７容積％（特に、５〜７容積％）
のものである。前記軽量骨材コンクリートは、特に、凍
結融解サイクル数が３００回における相対動弾性係数が
８０％以上のものである。この凍結融解サイクル数が３
００回における相対動弾性係数が８０％以上のものとす
るには、上記粗骨材の吸水率や含水率、或いは水セメン
ト比を更に好ましい範囲内のものに調整することによっ
て得られる。BEST MODE FOR CARRYING OUT THE INVENTION The lightweight aggregate concrete having frost resistance of the present invention is a lightweight aggregate concrete using light aggregate (particularly coarse aggregate), water and cement. In particular, coarse aggregate) has an absolute dry specific gravity of 0.7 to 1.
5 (especially 0.75 to 1.3) and a 24-hour water absorption of 0 to 5% by weight (preferably 0 to 4.5% by weight, particularly 0 to 4.0% by weight) It is an aggregate (particularly coarse aggregate), and a water cement ratio is 25 to 40% by weight (particularly, 28 to 40% by weight).
35% by weight). In particular, lightweight aggregates (especially coarse aggregates)
In the lightweight aggregate concrete using water, water, and cement, the lightweight aggregate (particularly, coarse aggregate) has an absolute dry specific gravity of 0.
7 to 1.5 (especially 0.75 to 1.3), and 24
The time water absorption is 0 to 5% by weight (preferably 0 to 4.5% by weight, particularly 0 to 4.0% by weight), and the water content at the start of kneading is 0 to 5% by weight (preferably). , 0 to 4.5% by weight, especially 0 to 4.0% by weight), and a water-cement ratio of 25 to 40% by weight (especially 28 to 35% by weight). ). Light-weight aggregates (especially coarse aggregates) have a crushing strength of 800 N or more (especially 1000 N).
N or more). The lightweight aggregate concrete,
The entrained air volume is 4-7% by volume (particularly 5-7% by volume)
belongs to. The lightweight aggregate concrete has a relative dynamic elastic modulus of 80% or more particularly when the freeze-thaw cycle number is 300 times. This freeze-thaw cycle number is 3
In order to make the relative kinetic elasticity coefficient at 80 times 80% or more, it can be obtained by adjusting the water absorption or the water content of the coarse aggregate or the water cement ratio within a more preferable range.
【００１８】以下、更に説明する。本発明で用いる軽量
骨材（特に、粗骨材）は、例えば黒曜石、真珠岩などの
ガラス質原料にＳｉＣ等の発泡剤やベントナイト等の粘
着材を加えて造粒し、この造粒物を１０００〜１３００
℃で焼成・発泡させることにより得られる。又、石灰石
にベントナイト等の粘着材を加えて造粒し、この造粒物
を１１５０〜１３５０℃で焼成・発泡させることにより
得られる。A further description will be given below. The lightweight aggregate (particularly coarse aggregate) used in the present invention is granulated by adding a foaming agent such as SiC or an adhesive such as bentonite to a vitreous raw material such as obsidian or perlite, and granulating the granulated material. 1000-1300
It is obtained by baking and foaming at ℃. Further, it is obtained by adding an adhesive such as bentonite to limestone and granulating the granulated product, and firing and foaming the granulated product at 1150 to 1350 ° C.
【００１９】上記のような特徴の軽量骨材（特に、粗骨
材）の具体例としては、例えばアサノスーパーライト
（太平洋セメント社製の商品名）が挙げられる。本発明
で用いるセメントは、例えば普通ポルトランドセメント
や早強ポルトランドセメント等のポルトランドセメン
ト、高炉セメントやシリカセメント等の混合セメントが
挙げられる。A specific example of the lightweight aggregate (particularly coarse aggregate) having the above characteristics is, for example, Asano Superlight (trade name, manufactured by Taiheiyo Cement Corporation). Examples of the cement used in the present invention include portland cement such as ordinary portland cement and early-strength portland cement, and mixed cement such as blast furnace cement and silica cement.
【００２０】上記特徴の軽量骨材（粗骨材）やセメント
の他に、必要に応じて各種の混和剤が用いられる。例え
ば、メラミン系、ナフタレンスルホン酸系やポリカルボ
ン酸系の減水剤（高性能減水剤や高性能ＡＥ減水剤）と
か、ＡＥ助剤などが用いられる。上記組成物の配合割合
は、上記特徴の軽量骨材（粗骨材）が０．３〜０．４ｍ
3 ／ｍ3 、細骨材が７００〜９００ｋｇ／ｍ3 、セメン
トが４００〜５２０ｋｇ／ｍ3 、水セメント比が２５〜
４０重量％、減水剤がセメント量の０．８〜１．３重量
％、ＡＥ助剤がセメント量の０．００２〜０．０１重量
％である。Lightweight aggregate (coarse aggregate) or cement having the above characteristics
In addition, various admixtures are used as needed. example
For example, melamine-based, naphthalenesulfonic acid-based
Acid-based water reducing agents (high performance water reducing agents and high performance AE water reducing agents)
Alternatively, an AE auxiliary or the like is used. Mixing ratio of the above composition
Is a lightweight aggregate (coarse aggregate) of the above characteristics 0.3-0.4m
Three/ MThree700-900kg / m fine aggregateThree, Semen
400 to 520 kg / mThree, Water-cement ratio is 25 ~
40% by weight, water reducing agent is 0.8-1.3% of cement amount
%, AE auxiliary is 0.002-0.01 weight of cement amount
%.
【００２１】そして、例えばオムニ型ミキサ、パン型ミ
キサ、又は二軸型ミキサ等を用いて上記割合の組成物を
混練する。この混練に際しての混練方法や時間は従来と
同じ手法を採用できる。例えば、一括してミキサ内に投
入し、混練する手法が採用されても良い。以下、具体的
実施例を幾つか挙げて説明するが、本発明はこれに限定
されるものでは無い。Then, the composition in the above ratio is kneaded using, for example, an omni-type mixer, a pan-type mixer, a biaxial mixer, or the like. The kneading method and time for this kneading can be the same as those in the conventional method. For example, a method in which the components are collectively put into a mixer and kneaded may be adopted. Hereinafter, some specific examples will be described, but the present invention is not limited thereto.
【００２２】[0022]
【実施例並びに比較例】〔使用材料〕 セメント（Ｃ）；太平洋セメント社製の普通ポルトラン
ドセメント 水（Ｗ） ；水道水 減水剤（ＳＰ）；エヌエムビー社製のレオビルドＳＰ−
８Ｓ ＡＥ剤（ＡＥ）；エヌエムビー社製のマイクロエア７７
５Ｓ 細骨材（Ｓ） ；青梅産砕砂 粗骨材（Ｇ１）；太平洋セメント社製のアサノスーパー
ライト 絶乾比重：０．７６ 表乾比重：０．７９ ２４時間吸水率：４．４０重量％ 煮沸吸水率：１１．３重量％ 圧壊強度：８２１Ｎ （Ｇ２）；太平洋セメント社製のアサノスーパーライト 絶乾比重：１．２２ 表乾比重：１．２７ ２４時間吸水率：３．９０重量％ 煮沸吸水率：８．２重量％ 圧壊強度：１２７４Ｎ （Ｇ３）；メサライト工業社製のメサライト 絶乾比重：１．２９ 表乾比重：１．５８ ２４時間吸水率：２３．４重量％ 圧壊強度：５３９Ｎ 煮沸吸水率：２７．９重量％ ＊絶乾比重および吸水率はＪＩＳ Ａ １１３４（構造
用軽量粗骨材の比重および吸水率試験方法）に準じて測
定した。２４時間吸水率は絶乾状態の粗骨材を水中に２
４時間浸漬した時の吸水率を示し、煮沸吸水率は絶乾状
態の粗骨材を水中で２時間煮沸した時の吸水率を示す。
表乾比重は絶乾状態の粗骨材を静水中で２４時間浸漬
し、吸水させた時の骨材の比重を示す。[Examples and Comparative Examples] [Materials Used] Cement (C); ordinary Portland cement manufactured by Taiheiyo Cement Co. Water (W); tap water water reducing agent (SP); Reobuild SP-manufactured by NMB Corporation
8S AE agent (AE); Micro Air 77 manufactured by NMB
5S fine aggregate (S); crushed sand from Ome coarse aggregate (G1); Asano Superlite manufactured by Taiheiyo Cement Co., Ltd. Absolute specific gravity: 0.76 Table dry specific gravity: 0.79 24 hours water absorption: 4.40% by weight Boiling water absorption: 11.3% by weight Crushing strength: 821N (G2); Asano Superlite manufactured by Taiheiyo Cement Co., Ltd. Absolute specific gravity: 1.22 Table dry specific gravity: 1.27 24 hours water absorption: 3.90% by weight Boiling Water absorption: 8.2% by weight Crushing strength: 1274N (G3); Mesalite manufactured by Mesalight Industry Co., Ltd. Absolute specific gravity: 1.29 Table dry specific gravity: 1.58 24 hours water absorption: 23.4% by weight Crushing strength: 539N Boiling water absorption: 27.9% by weight * The absolute dry specific gravity and the water absorption were measured in accordance with JIS A 1134 (Test method for specific gravity and light absorption of lightweight structural coarse aggregate). The water absorption rate for 24 hours is 2
The water absorption rate when immersed for 4 hours is shown, and the boiling water absorption rate is the water absorption rate when absolutely dried coarse aggregate is boiled in water for 2 hours.
The surface dry specific gravity indicates the specific gravity of the aggregate when absolutely dry coarse aggregate is immersed in still water for 24 hours to absorb water.
【００２３】＊圧壊強度はＪＩＳ Ｚ ８８４１（造粒
物−強度試験方法）に準じ、骨材径が１４±１ｍｍのも
のについて測定した。 〔配合および練混ぜ〕上記組成物を表−１に示す条件で
パン型ミキサに投入し、２分間練混ぜを行った。この混
練物を型に入れ、１０×１０×４０ｃｍの供試体を成形
した。* The crushing strength was measured for an aggregate having a diameter of 14 ± 1 mm according to JIS Z 8841 (granulated material-strength test method). [Blending and kneading] The above composition was charged into a bread mixer under the conditions shown in Table 1, and kneaded for 2 minutes. The kneaded material was put in a mold to form a 10 × 10 × 40 cm specimen.
【００２４】 表−１ No 配合量(kg/m3) 粗骨材(G) W／C 目標 W C S G SP AE 種類 含水状態 含水率 (wt%) 空気量 (wt%) (%) １ G1 絶対乾燥 0.0 30 5.5±1.5 155 517 714 355 1.3 0.01 ２ G1 絶対乾燥 0.0 40 5.5±1.5 164 410 774 359 1.0 0.004 ３ G1 気中乾燥 2.0 30 5.5±1.5 155 517 714 355 1.0 0.004 ４ G1 24Hr吸水 4.4 30 5.5±1.5 155 517 714 355 1.0 0.004 ５ G2 絶対乾燥 0.0 40 5.5±1.5 164 410 774 359 1.2 0.004 ６ G2 24Hr吸水 3.9 30 5.5±1.5 155 517 714 355 1.3 0.01 ７ G2 24Hr吸水 3.9 40 5.5±1.5 164 410 774 359 1.2 0.002 ８ G1 24Hr吸水 4.4 45 1.0±1.5 170 378 780 360 0.8 0.004 ９ G2 24Hr吸水 3.9 45 5.5±1.5 170 378 780 360 0.9 0.004 10 G2 24Hr吸水 3.9 50 5.5±1.5 175 350 788 362 1.2 0.01 11 G2 24Hr吸水 3.9 60 5.5±1.5 184 307 796 364 1.0 0.006 12 G3 24Hr吸水 23.4 40 5.5±1.5 164 410 772 360 1.1 0.01 13 G3 24Hr吸水 23.4 30 3.0±0.5 155 517 714 355 1.1 0.01 14 G3 24Hr吸水 15.6 40 5.5±1.5 164 410 772 360 1.1 0.01 ＊減水剤（ＳＰ）及びＡＥ剤（ＡＥ）の欄における数値は（Ｃ）セメント に対する重量％で表示した。 〔評価〕 相対動弾性係数（耐久性指数） 上記供試体について急速水中凍結融解試験（ＡＳＴＭ
Ｃ６６６ Ａ法に準拠）を行った。そして、３６サイク
ル毎に一次共鳴振動数並びに供試体質量を測定した。測
定は３００サイクルまで行い、相対動弾性係数が６０％
以下、或いは３００サイクル以前に測定不能となった場
合には、その時点で終了した。 急速水中凍結融解試験後の供試体表面の観察 急速水中凍結融解試験（ＡＳＴＭ Ｃ６６６ Ａ法に準
拠）の測定ごとに凍結融解作用による供試体表面の劣化
状況を目視により観察した。その損傷具合を三段階で評
価した。◎印は外観上殆ど損傷が無く、○印はスケーリ
ング或いはポップアウト等の表面劣化が認められ、×印
は表面剥離の他にもひび割れが多数生じているを示す。Table 1 No- content (kg / m 3 ) Coarse aggregate (G) W / C target WCSG SP AE Type Water content Water content (wt%) Air content (wt%) (%) 1 G1 Absolutely dry 0.0 30 5.5 ± 1.5 155 517 714 355 1.3 0.01 2 G1 Absolute dry 0.0 40 5.5 ± 1.5 164 410 774 359 1.0 0.004 3 G1 Air dry 2.0 30 5.5 ± 1.5 155 517 714 355 1.0 0.004 4 G1 24Hr Absorption 4.4 30 5.5 ± 1.5 155 517 714 355 355 1.0 0.004 5 G2 Absolute drying 0.0 40 5.5 ± 1.5 164 410 774 359 1.2 0.004 6 G2 24Hr water absorption 3.9 30 5.5 ± 1.5 155 517 714 355 355 1.3 0.017 G2 24Hr water absorption 3.9 40 5.5 ± 1.5 164 410 774 359 1.2 0.002 8 G1 24Hr water absorption 4.4 45 1.0 ± 1.5 170 378 780 360 0.8 0.004 9 G2 24Hr water absorption 3.9 45 5.5 ± 1.5 170 378 780 360 0.9 0.004 10 G2 24Hr water absorption 3.9 50 5.5 ± 1.5 175 350 788 362 1.2 0.01 11 G2 24Hr Water absorption 3.9 60 5.5 ± 1.5 184 307 796 364 1.0 0.006 12 G3 24Hr water absorption 23.4 40 5.5 ± 1.5 164 410 772 360 1.1 0.01 13 G3 24Hr water absorption 23.4 30 3.0 ± 0.5 155 517 714 355 355 1.1 0.01 14 G3 24Hr water absorption 15.6 40 5.5 ± 1.5 164 410 772 360 1.1 0.01 * Water reducing agent (S The numerical values in the columns of (P) and AE agent (AE) are shown in% by weight based on (C) cement. [Evaluation] Relative kinetic elasticity coefficient (durability index) Rapid water freeze-thaw test (ASTM)
C666A method). Then, the primary resonance frequency and the specimen mass were measured every 36 cycles. The measurement is performed up to 300 cycles and the relative dynamic elastic modulus is 60%
In the following, or when the measurement becomes impossible before 300 cycles, the measurement is terminated at that point. Observation of specimen surface after rapid water freeze-thaw test The deterioration state of the specimen surface due to freeze-thaw action was visually observed for each measurement of the rapid water freeze-thaw test (based on ASTM C666A method). The degree of damage was evaluated on a three-point scale. The mark ◎ indicates almost no damage in appearance, the mark が indicates surface deterioration such as scaling or pop-out, and the mark × indicates that many cracks have occurred in addition to the surface peeling.
【００２５】上記の結果を表−２、及び図１並びに図２
に示す。 表−２ Ｎｏ 耐久性指数 表面観察 備考 総合評価 １ ９２ ○ Ａ 本発明 ２ ６９ ○ Ｂ 本発明 ３ ７８ ○ Ｂ 本発明 ４ ７３ ○ 若干ポップアウト Ｂ 本発明 ５ ８９ ◎ Ａ 本発明 ６ １００ ◎ Ａ 本発明 ７ ７５ ○ 若干スケーリング Ｂ 本発明 ８ ３１ × Ｄ 発明外 ９ ６２ ○ Ｃ 発明外 １０ ４９ × スケーリング多数 Ｄ 発明外 １１ ３７ × スケーリング多数 Ｄ 発明外 １２ ４ × 50サイクルで破断 Ｄ 発明外 １３ ５ × 70サイクルで破断 Ｄ 発明外 １４ ２ × スケーリング多数 ひび割れ多い Ｄ 発明外The above results are shown in Table 2, FIG. 1 and FIG.
Shown in Table-2 No. Durability index Surface observation Remarks Overall evaluation 192 Ａ A The present invention 269 B The present invention 378 Ｂ B The present invention 473 Some pop-out B The present invention 589 ８９ A The present invention 6 100 A Invention 775 ○ Slightly scaled B Invention 831 × D Uninvented 962 ○ C Uninvented 10 49 × Scaling many D Uninvented 11 37 × Scaling many D D Uninvented 124 4 × 50 cycles broken D out of invention 135 × Broken at 70 cycles D Not invented 14 2 × Many scaling Many cracks D Not invented
【００２６】[0026]
【発明の効果】混練水の管理が簡単で、作業性に優れ、
更には寒冷地における耐久性に優れ、耐凍害性を有す
る。According to the present invention, the kneading water can be easily managed, the workability is excellent,
Furthermore, it has excellent durability in cold regions and has frost damage resistance.
【図１】相対動弾性係数のグラフFIG. 1 is a graph of relative dynamic elastic modulus.
【図２】相対動弾性係数のグラフFIG. 2 is a graph of a relative dynamic elastic modulus.
フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０４Ｂ 14:02 14:18） 111:40 (72)発明者 児玉 明彦 東京都江東区清澄１−２−23 太平洋セメ ント株式会社研究本部内 (72)発明者 河野 克哉 東京都江東区清澄１−２−23 太平洋セメ ント株式会社研究本部内 Ｆターム(参考） 4G012 PA02 PA03 PA04 PB24 PB32 PB35 PC02 PC03 4G019 LA02 LB02 Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat II (Reference) C04B 14:02 14:18) 111: 40 (72) Inventor Akihiko Kodama 1-2-23 Kiyosumi, Koto-ku, Tokyo Pacific Seme Katsuya Kono, Inventor Katsuya Kono 1-2-23 Kiyosumi, Koto-ku, Tokyo F-term (reference) 4G012 PA02 PA03 PA04 PB24 PB32 PB35 PC02 PC03 4G019 LA02 LB02
Claims (4)
骨材コンクリートにおいて、 前記軽量骨材は、絶乾比重が０．７〜１．５で、かつ、
２４時間吸水率が０〜５重量％の軽量骨材であり、 水セメント比は２５〜４０重量％であることを特徴とす
る軽量骨材コンクリート。1. A lightweight aggregate concrete using a lightweight aggregate, water and cement, wherein the lightweight aggregate has a bone-dry specific gravity of 0.7 to 1.5, and
A lightweight aggregate concrete having a 24-hour water absorption of 0 to 5% by weight and a water cement ratio of 25 to 40% by weight.
骨材コンクリートにおいて、 前記軽量骨材は、絶乾比重が０．７〜１．５で、かつ、
２４時間吸水率が０〜５重量％であり、更に混練開始時
の含水率が０〜５重量％の軽量骨材であり、 水セメント比は２５〜４０重量％であることを特徴とす
る軽量骨材コンクリート。2. A lightweight aggregate concrete using a lightweight aggregate, water and cement, wherein the lightweight aggregate has a bone-dry specific gravity of 0.7 to 1.5, and
A lightweight aggregate having a 24-hour water absorption of 0 to 5% by weight, a water content at the start of kneading of 0 to 5% by weight, and a water-cement ratio of 25 to 40% by weight. Aggregate concrete.
ものであることを特徴とする請求項１又は請求項２の軽
量骨材コンクリート。3. The lightweight aggregate concrete according to claim 1, wherein the lightweight aggregate has a crushing strength of 800 N or more.
特徴とする請求項１〜請求項３いずれかの軽量骨材コン
クリート。4. The lightweight aggregate concrete according to claim 1, wherein the entrained air amount is 4 to 7% by volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11068051A JP2000264699A (en) | 1999-03-15 | 1999-03-15 | Lightweight aggregate concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11068051A JP2000264699A (en) | 1999-03-15 | 1999-03-15 | Lightweight aggregate concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000264699A true JP2000264699A (en) | 2000-09-26 |
Family
ID=13362613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11068051A Pending JP2000264699A (en) | 1999-03-15 | 1999-03-15 | Lightweight aggregate concrete |
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| Country | Link |
|---|---|
| JP (1) | JP2000264699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009161388A (en) * | 2007-12-29 | 2009-07-23 | Taiheiyo Materials Corp | High flow light weight mortar composition |
| JP2019048421A (en) * | 2017-09-11 | 2019-03-28 | 太平洋セメント株式会社 | Method of producing concrete |
-
1999
- 1999-03-15 JP JP11068051A patent/JP2000264699A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009161388A (en) * | 2007-12-29 | 2009-07-23 | Taiheiyo Materials Corp | High flow light weight mortar composition |
| JP2019048421A (en) * | 2017-09-11 | 2019-03-28 | 太平洋セメント株式会社 | Method of producing concrete |
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