JPH11343155A - Ultra-lightweight concrete - Google Patents
Ultra-lightweight concreteInfo
- Publication number
- JPH11343155A JPH11343155A JP14820698A JP14820698A JPH11343155A JP H11343155 A JPH11343155 A JP H11343155A JP 14820698 A JP14820698 A JP 14820698A JP 14820698 A JP14820698 A JP 14820698A JP H11343155 A JPH11343155 A JP H11343155A
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- ultra
- volume
- concrete
- lightweight concrete
- 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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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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- 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、単位容積質量を軽
量化し、かつ、圧縮強度を向上させた超軽量コンクリー
トに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-lightweight concrete having a reduced weight per unit volume and improved compressive strength.
【０００２】[0002]
【従来の技術】軽量コンクリートの骨材としては、従来
より、真珠岩、粘土、頁岩、粘板岩等の天然材料や、ガ
ラス、フライアッシュ、膨張スラグ等の工業副産物及び
工業製品が使用されている。2. Description of the Related Art Conventionally, natural materials such as perlite, clay, shale and slate, and industrial by-products and industrial products such as glass, fly ash and expanded slag have been used as aggregates for lightweight concrete.
【０００３】しかしながら、上記骨材を使用した軽量コ
ンクリートでは、骨材自体の圧縮強度が低いため、十分
な圧縮強度（例えば、３５Ｎ／ｍｍ2 以上）を有し、な
おかつ、比重が１．３以下である超軽量コンクリートを
得ることは困難であった。また、ガラス等を主原料とし
た骨材については、アルカリ骨材反応による耐久性の低
下という問題点も指摘されている。However, the lightweight concrete using the above-mentioned aggregate has a low compressive strength of the aggregate itself, so that it has a sufficient compressive strength (for example, 35 N / mm 2 or more) and a specific gravity of 1.3 or less. It was difficult to obtain ultra-lightweight concrete. In addition, it has been pointed out that an aggregate using glass or the like as a main raw material has a problem in that durability is reduced due to an alkali aggregate reaction.
【０００４】日本建築学会大会学術講演梗概集１９９７
年９月、第３３３〜３３６頁「超軽量高強度コンクリー
トの建築構造物への適用」には、目標単位容積質量を１
２００ｋｇ／ｍ3 とした超軽量コンクリートの配合と、
そのフレッシュ性状および硬化性状が記載されている
が、これら超軽量コンクリートの材齢２８日における圧
縮強度は何れも３１Ｎ／ｍｍ2 程度に止まっている。Summary of the Architectural Institute of Japan Annual Meeting 1997
In September, pp. 333-336, "Application of ultra-light and high-strength concrete to building structures,"
200kg / m 3 of ultra-lightweight concrete,
The fresh and hardened properties are described, but the compressive strength of these ultra-lightweight concretes at the age of 28 days is only about 31 N / mm 2 .
【０００５】[0005]
【発明が解決しようとする課題】本発明は上記課題を解
決するものであり、超軽量コンクリートの配合を調整す
ることにより、単位容積質量が小さく圧縮強度の高い超
軽量コンクリートを提供することを発明の目的とするも
のである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an ultra-lightweight concrete having a small unit volume and a high compressive strength by adjusting the composition of the ultralightweight concrete. It is the purpose of.
【０００６】[0006]
【課題を解決するための手段】本発明は、骨材の一部ま
たは全部をセラミックス系骨材とし、比重が１．３以下
で、かつ、圧縮強度が３５Ｎ／ｍｍ2 以上である超軽量
コンクリートを以て課題を解決するための手段とするも
のである。SUMMARY OF THE INVENTION The present invention relates to an ultra-lightweight concrete in which a part or all of the aggregate is made of ceramics aggregate, the specific gravity is 1.3 or less, and the compressive strength is 35 N / mm 2 or more. This is a means for solving the problem.
【０００７】前記超軽量コンクリートは、（１）水セメ
ント比：２５％〜３５％、（２）超軽量コンクリート１
００容積部当りの粗骨材の配合量：２８〜３３容積部、
および、（３）超軽量コンクリート１００容積部当りの
細骨材容積部（Ｓｖ）／モルタル容積部（Ｍｖ）：５０
〜５５％、であることが好ましい。前記超軽量コンクリ
ートは、前記超軽量コンクリート１００容積部に対し
て、最大０．２容積部の短繊維、特に、ビニロン製の短
繊維を含有することが好ましい。[0007] The ultra-light concrete is (1) water cement ratio: 25% to 35%, (2) ultra-light concrete 1
Compounding amount of coarse aggregate per 100 parts by volume: 28 to 33 parts by volume,
And (3) Volume of fine aggregate (Sv) / volume of mortar (Mv) per 100 parts by volume of ultralight concrete: 50
５５55%. It is preferable that the ultralight concrete contains at most 0.2 volume parts of short fibers, particularly vinylon short fibers, based on 100 volume parts of the ultralight concrete.
【０００８】[0008]
【発明の実施の形態】以下、本発明の好適な実施形態を
説明する。Preferred embodiments of the present invention will be described below.
【０００９】本発明に係る超軽量コンクリートは、粗骨
材、細骨材としての超軽量骨材、バインダーおよび水道
水を主材料とする。バインダーとしては、ＪＩＳに規格
化されたポルトランドセメント（JIS R 5210）を使用す
ることができる。また、超軽量骨材としては、セラミッ
クス系焼成物、膨張性頁岩焼成物などの人工粗骨材や、
セラミックス系焼成物からなる人工細骨材を使用する。[0009] The ultralight concrete according to the present invention is mainly composed of coarse aggregate, ultralight aggregate as fine aggregate, binder and tap water. Portland cement (JIS R 5210) standardized by JIS can be used as the binder. In addition, as the ultra-light aggregate, artificial coarse aggregate such as ceramic-based fired material, expansive shale fired material,
An artificial fine aggregate made of a ceramic fired product is used.
【００１０】超軽量コンクリートの水セメント比は、２
５〜３５％が好ましい。圧縮強度を高めるためには水セ
メント比をできるだけ小さくするのがよいが、２５％未
満での圧縮強度の増進は認められない。一方、３５％を
越えると、所要の圧縮強度が得られない。水セメント比
の最適範囲は、２５〜３２．５％である。The water-cement ratio of ultra-light concrete is 2
5-35% is preferred. In order to increase the compressive strength, it is preferable to make the water-cement ratio as small as possible, but no increase in the compressive strength is observed below 25%. On the other hand, if it exceeds 35%, the required compressive strength cannot be obtained. The optimal range of the water cement ratio is 25-32.5%.
【００１１】粗骨材の使用量は、超軽量コンクリート１
００容積部当り、２８〜３５容積部とすることが好まし
い。３３容積部を大きく越えると骨材容積部に対するペ
ーストの量が相対的に少なくなり、水セメント比を低く
して高性能ＡＥ減水剤で調整しても、骨材とセメントペ
ーストとが分離し易くなる。他方、２８容積部未満で
は、セメントや高性能ＡＥ減水剤等の使用量が増加し、
不経済となる。The amount of coarse aggregate used is as follows:
The volume is preferably 28 to 35 parts by volume per 00 parts by volume. If the volume greatly exceeds 33 parts by volume, the amount of the paste relative to the volume of the aggregate becomes relatively small, and even if the water-cement ratio is lowered and adjusted with a high-performance AE water reducing agent, the aggregate and the cement paste are easily separated. Become. On the other hand, if it is less than 28 parts by volume, the amount of use of cement, high-performance AE water reducing agent, etc. increases,
It is uneconomical.
【００１２】超軽量コンクリートの細骨材モルタル比、
即ち、超軽量コンクリート１００容積部当りの細骨材容
積部（Ｓｖ）／モルタル容積部（Ｍｖ）は、５０〜５５
％とすることが好ましい。５０％未満だと、ペースト分
が相対的に多くなりセメント及び高性能ＡＥ減水剤等の
使用量が増加して、不経済となる。また、５５％を越え
ると、超軽量コンクリートに対するペースト分が相対的
に少なくなり、所要のスランプ値を得ることができず、
ワーカビリティが低下する。A fine aggregate mortar ratio of ultra-lightweight concrete,
That is, the fine aggregate volume part (Sv) / mortar volume part (Mv) per 100 volume parts of ultra-light concrete is 50 to 55.
% Is preferable. If it is less than 50%, the paste content becomes relatively large, and the amount of cement and high-performance AE water reducing agent used increases, which is uneconomical. On the other hand, if it exceeds 55%, the paste content relative to the ultra-lightweight concrete becomes relatively small, and the required slump value cannot be obtained.
Workability is reduced.
【００１３】本発明に係る超軽量コンクリートのフレッ
シュ時の性状は、コンクリートのスランプ試験法（JIS
A 1101-1975 ）によって管理する。超軽量コンクリート
の好ましいスランプ値は、９．５ｃｍ〜１４．５ｃｍで
ある。９．５ｃｍ未満では型枠打設が困難であり、充填
性が悪くなる。一方、１４．５ｃｍを越えると、骨材と
セメントペーストが分離し易く、施工不良の虞が生じて
くる。The properties of the ultra-lightweight concrete according to the present invention at the time of freshness are determined by the slump test method (JIS) of concrete.
A 1101-1975). The preferred slump value for ultra-lightweight concrete is 9.5 cm to 14.5 cm. If it is less than 9.5 cm, it is difficult to form a mold and the filling property is poor. On the other hand, if it exceeds 14.5 cm, the aggregate and the cement paste are easily separated, and there is a risk of poor construction.
【００１４】超軽量コンクリートの単位水量及び単位セ
メント量は、上記した水セメント比、細骨材モルタル比
及び粗骨材の使用量により決定される。また、超軽量コ
ンクリートの空気量は、凍結融解抵抗性の観点から軽量
コンクリート１００容積部に対して３．５〜６．５容積
部とすることが望ましい。なお、本発明の超軽量コンク
リートには、長期強度の増大やワーカビリティの向上を
目的としてシリカヒューム混合することも可能である。
但し、コスト的には不利なものとなる。The unit water amount and unit cement amount of the ultralight concrete are determined by the water cement ratio, the fine aggregate mortar ratio and the amount of the coarse aggregate described above. The amount of air in the ultra-lightweight concrete is desirably 3.5 to 6.5 parts by volume based on 100 parts by volume of the lightweight concrete from the viewpoint of freeze-thaw resistance. The ultra-lightweight concrete of the present invention may be mixed with silica fume for the purpose of increasing long-term strength and improving workability.
However, it is disadvantageous in terms of cost.
【００１５】一般に、軽量コンクリートは脆く、運搬時
等に不測の衝撃を受けて破損したり、また、若材齢にお
いてコンクリート表面に微細なひび割れが発生すること
もある。そこで、本発明に係る超軽量コンクリートで
は、所望により短繊維を混入して、一層の強度の向上と
乾燥圧縮によるひび割れ発生を抑制することができるも
のである。混入に適した短繊維としては、ビニロン繊
維、炭素繊維、ポリエチレン繊維、アクリル繊維、ポリ
プロピレン繊維等を挙げることができる。In general, lightweight concrete is brittle, and may be damaged by an unexpected impact during transportation or the like, and fine cracks may occur on the concrete surface at a young age. Therefore, in the ultralight concrete according to the present invention, short fibers can be mixed as required to further improve the strength and suppress the occurrence of cracks due to dry compression. Short fibers suitable for mixing include vinylon fiber, carbon fiber, polyethylene fiber, acrylic fiber, polypropylene fiber and the like.
【００１６】短繊維の混入量は、超軽量コンクリート１
００容積部に対して、最大０．２容積部とすることが好
ましい。０．２容積部を越えて混入すると、所要のワー
カビリティを得るためには、粗骨材の使用量を軽量コン
クリート１００容積部当り２８容積部未満とし、かつ増
粘剤等の特殊混和剤を使用しなければならず、結局、不
経済となる。ビニロン製短繊維の場合の最適混入量は、
０．１〜０．２容積部である。The amount of short fibers mixed is as follows:
It is preferable that the maximum volume is 0.2 volume parts with respect to 00 volume parts. If it is mixed in more than 0.2 parts by volume, in order to obtain the required workability, the amount of coarse aggregate used should be less than 28 parts by volume per 100 parts by volume of lightweight concrete, and a special admixture such as a thickener should be used. Must be used, which is ultimately uneconomical. The optimal mixing amount for vinylon short fibers is
0.1 to 0.2 parts by volume.
【００１７】本発明の超軽量コンクリートは、通常の練
り混ぜ方法により製造される。例えば、セメント、細骨
材および必要により添加される短繊維を、パン型ミキサ
等に混入し、空練り後、水および必要により高性能ＡＥ
減水剤を加えて練り混ぜる。最後に、粗骨材を加えて更
に練り混ぜる。The ultra-lightweight concrete of the present invention is manufactured by a usual mixing method. For example, cement, fine aggregate, and optionally added short fibers are mixed into a bread mixer or the like, and after kneading, water and, if necessary, high-performance AE
Add water reducer and mix. Finally, the coarse aggregate is added and further mixed.
【００１８】従来、軽量コンクリートを製造する場合に
は、骨材を十分吸水させ表乾状態で使用している。しか
し、本発明のように比重１．３以下の超軽量コンクリー
トを製造するときには、比重１．０以下の骨材を使用し
なければならず、細骨材を吸水させかつ表乾状態にする
のは非常に困難である。しかし、上記混練り時に絶乾状
態の細骨材を使用すると、セメントとの水和反応に必要
な水分を吸水してしまう。混練り時から硬化するまでに
吸水する水分量は、細骨材が３０分間に吸水する水分量
に匹敵するので、混練り時、練り混ぜ水に３０分吸水量
を加えて練り混ぜることにより、事前に細骨材の吸水処
理を省略することができる。また、この方法により、骨
材の吸水による微細ひび割れも低減することが可能とな
る。Conventionally, when manufacturing lightweight concrete, the aggregate is sufficiently absorbed and used in a dry state. However, when producing ultra-lightweight concrete having a specific gravity of 1.3 or less as in the present invention, aggregate having a specific gravity of 1.0 or less must be used. Is very difficult. However, when fine bone aggregates in a completely dry state are used during the kneading, water required for a hydration reaction with cement is absorbed. The amount of water absorbed from the time of kneading until it hardens is equivalent to the amount of water absorbed by the fine aggregate for 30 minutes, so at the time of kneading, kneading the kneading water by adding the water absorption for 30 minutes. The water absorption treatment of the fine aggregate can be omitted in advance. In addition, this method makes it possible to reduce fine cracks caused by water absorption of the aggregate.
【００１９】上記混練材料は、常圧蒸気養生を行うのが
好ましい。常圧蒸気養生は、例えば、前記練り混ぜた配
合材料を型枠等に打設した後、直ちに常圧蒸気養生槽に
入れ、最初の３時間は養生槽温度を２０℃に保ち、その
後２時間かけて５０℃まで徐々に昇温する。この養生槽
温度を５０℃で５時間保持した後、２時間かけて２０℃
まで徐々に降温し、２０℃で１２時間保持する。なお、
この蒸気養生中、養生槽の湿度は９０％程度に保持す
る。蒸気養生によって若材齢期における部材の圧縮強度
が増進する。The above kneaded material is preferably subjected to normal pressure steam curing. Atmospheric pressure steam curing is, for example, after placing the kneaded compounded material in a mold or the like, immediately put it into an atmospheric pressure steam curing tank, keeping the curing tank temperature at 20 ° C. for the first 3 hours, and then 2 hours And gradually raise the temperature to 50 ° C. After maintaining the curing tank temperature at 50 ° C. for 5 hours, the temperature was maintained at 20 ° C. for 2 hours.
The temperature is gradually lowered until the temperature is maintained at 20 ° C. for 12 hours. In addition,
During the steam curing, the humidity of the curing tank is maintained at about 90%. By the steam curing, the compressive strength of the member at the young age is increased.
【００２０】上記配合及び混練、養生方法により超軽量
コンクリートを製造すれば、硬化時の性状として、材齢
２８日におけるコンクリートの圧縮強度試験方法（JIS
A 1108-1993 ）及びコンクリートの静弾性係数試験法
（JSCE-G 502-1988 ）によって、圧縮強度試験値３５Ｎ
／ｍｍ2 以上、静弾性係数試験値１３．０ｋＮ／ｍｍ2
以上のものを得ることができる。If an ultra-lightweight concrete is manufactured by the above-mentioned mixing, kneading and curing methods, the properties at the time of hardening can be determined by the method of testing the compressive strength of concrete at the age of 28 days (JIS).
A 1108-1993) and the test method for static elastic modulus of concrete (JSCE-G 502-1988).
/ Mm 2 or more, static elastic modulus test value 13.0 kN / mm 2
The above can be obtained.
【００２１】[0021]
【実施例】以下、実施例により本発明の超軽量コンクリ
ートを詳述する。EXAMPLES The ultralight concrete of the present invention will be described below in detail with reference to examples.
【００２２】〔超軽量コンクリートの製造〕１．使用材料 （ａ）セメント：早強ポルトランドセメント（秩父小野
田（株）製、JIS R 5210適合品、比重３．１５） （ｂ）水：水道水 （ｃ）粗骨材：「スパーメサライト」（日本メサライト
工業（株）製、膨張性頁岩焼成物、粒径１５ｍｍ〜５ｍ
ｍ、比重０．９１）[0022] [Production of ultra-lightweight concrete] 1. Materials used (a) Cement: Early strength Portland cement (manufactured by Chichibu Onoda Co., Ltd., JIS R 5210 compliant, specific gravity 3.15) (b) Water: tap water (c) Coarse aggregate: "Spar Mesalite" ( Nippon Mesalite Industry Co., Ltd., fired expansible shale, particle size 15 mm to 5 m
m, specific gravity 0.91)
【００２３】（ｄ）細骨材：３種類の「Ｎライト」（内
外セラミック（株）製、セラミックス系焼成物）Ｎ1 、
Ｎ2 、Ｎ3 を表１に示す割合で混合したものを使用し
た。(D) Fine aggregate: three types of "N light" (ceramic-based fired product manufactured by Naigai Ceramics Co., Ltd.) N 1 ,
A mixture of N 2 and N 3 in the proportions shown in Table 1 was used.
【００２４】[0024]
【表１】 [Table 1]
【００２５】（ｅ）高性能ＡＥ減水剤：「レオビルドSP
8NX2」（（株）エヌエムビー製、ポリカルボン酸系） （ｆ）ビニロン短繊維：「RF-S602 ×6 」（（株）クラ
レ製、収束糸タイプ、１２００デニール／２００本×６
ｍｍカット、比重１．３０）(E) High-performance AE water reducing agent: "Reobuild SP
8NX2 "(manufactured by NMB Corporation, polycarboxylic acid) (f) Vinylon short fiber:" RF-S602 x 6 "(manufactured by Kuraray Co., Ltd., converging thread type, 1200 denier / 200 yarns x 6)
mm cut, specific gravity 1.30)
【００２６】２．配合 超軽量コンクリートの配合を表２に示す。[0026] 2. The compounding formulation ultra lightweight concrete are shown in Table 2.
【００２７】[0027]
【表２】配合 W/C S V /M V 水 セメント 粗 骨 材 細 骨 材 短繊維 No. (%) (%) (kg/m 3 )(kg/m3)(l/m3)(kg/m3) (l/m3)(kg/m3) (%) 1 22 52.5 121 549 330 300 326 292 0 2 25 52.5 130 520 330 300 326 292 0 3 30 52.5 143 478 330 300 326 292 0 4 35 52.5 155 442 330 300 326 292 0 5 40 52.5 164 411 330 300 326 292 0 6 30 52.5 159 532 260 237 362 325 0 7 30 52.5 164 516 280 255 352 316 0 8 30 52.5 132 439 380 346 299 269 0 9 30 47.5 158 528 330 300 295 265 0 10 30 50.0 151 503 330 300 310 278 0 11 30 55.0 136 453 330 300 341 306 0 12 30 57.5 128 427 330 300 357 320 0 13 30 52.5 143 477 330 300 325 292 0.1 14 30 52.5 143 476 330 300 324 291 0.2 15 30 52.5 142 474 330 300 323 290 0.4TABLE 2 Formulation W / C S V / M V Water Cement Coarse Aggregate Fine Aggregate short fibers No. (%) (%) (Kg / m 3) (kg / m 3) (l / m 3) ( kg / m 3 ) (l / m 3 ) (kg / m 3 ) (%) 1 22 52.5 121 549 330 300 326 292 0 2 25 52.5 130 520 330 300 326 292 0 3 30 52.5 143 478 330 300 326 292 0 4 35 52.5 155 442 330 300 326 292 0 5 40 52.5 164 411 330 300 326 292 0 6 30 52.5 159 532 260 237 362 325 0 7 30 52.5 164 516 280 280 255 352 316 0 8 30 52.5 132 439 380 346 299 269 0 9 30 47.5 158 528 330 300 295 265 0 10 30 50.0 151 503 330 300 310 278 0 11 30 55.0 136 453 330 300 341 306 0 12 30 57.5 128 427 330 300 357 320 0 13 30 52.5 143 477 330 300 325 292 0.1 14 30 52.5 143 476 330 300 324 291 0.2 15 30 52.5 142 474 330 300 323 290 0.4
【００２８】３．混練 容量５０リットルの強制練りパン型ミキサを準備し、上
記セメント、細骨材および必要により添加されるビニロ
ン製短繊維を混入して１５秒間空練りした。細骨材は絶
乾状態で使用し、３０分吸水率分の水分を補正した。次
に、水と高性能ＡＥ減水剤を加えて３０秒間練り混ぜ
た。なお、高性能ＡＥ減水剤は水溶液なので、使用数量
を計量した後、練り混ぜ水計量時に、練り混ぜ水と共に
計量した。[0028] 3. A forced kneading pan-type mixer having a kneading capacity of 50 liters was prepared, and the above-mentioned cement, fine aggregate, and vinylon short fibers added as necessary were mixed and kneaded for 15 seconds. The fine aggregate was used in a completely dry state, and the water content was corrected for the water absorption rate for 30 minutes. Next, water and a high-performance AE water reducing agent were added and kneaded for 30 seconds. Since the high-performance AE water reducing agent is an aqueous solution, it was measured together with the mixing water at the time of measuring the mixing water after measuring the quantity used.
【００２９】パン型ミキサの縁等に付着したセメントや
細骨材を掻き出し、更に６０秒間練り混ぜた。その後、
粗骨材を加えて９０秒間練り混ぜ、５分間静置した後、
パン型ミキサから排出した。粗骨材は絶乾状態で使用
し、３０分吸水率分の水分を補正した。The cement and fine aggregate adhering to the edge of the bread mixer were scraped out and kneaded for 60 seconds. afterwards,
After adding the coarse aggregate, kneading for 90 seconds and leaving it to stand for 5 minutes,
Discharged from the bread mixer. The coarse aggregate was used in an absolutely dry state, and the water content was corrected for the water absorption rate for 30 minutes.
【００３０】〔試験方法〕 （１）フレッシュ性状 スランプ値はJIS A 1101-1975 によって測定した。分離
状況は目視で行い、表３において、練り上がり５分後に
セメントペーストと骨材が分離していなければ「○」、
分離していれば「×」と表記した。[Test Method] (1) Fresh Properties Slump value was measured according to JIS A 1101-1975. The state of separation was visually observed. In Table 3, if the cement paste and the aggregate were not separated 5 minutes after kneading, "O"
If separated, it was described as "x".
【００３１】（２）硬化性状 上記フレッシュ性状の測定後、直ちにφ１００ｍｍ×２
００ｍｍの供試体をJIS A 1132-1993 に準拠した方法で
採取し、２４時間経過後脱型し水中養生を行った。材齢
２８日における圧縮強度試験をJIS A 1108-1993 及び静
弾性係数試験をJSCE-G 502-1988 に準拠して行った。硬
化性状を、前記フレッシュ性状と併せて表３に示す。(2) Curing properties Immediately after measuring the above-mentioned fresh properties, φ100 mm × 2
A 00 mm specimen was collected by a method according to JIS A 1132-1993, and after 24 hours, it was demolded and cured in water. A compressive strength test at a material age of 28 days was performed according to JIS A 1108-1993 and a static elastic modulus test was performed according to JSCE-G 502-1988. The curing properties are shown in Table 3 together with the fresh properties.
【００３２】[0032]
【表３】配合 フレッシュ性状 硬化性状 No. Slump 空気量 温度 分離 圧縮強度 静弾性係数 (cm) (%) (℃) 状況 (N/mm2) (kN/mm2) 1 14.0 4.0 20.0 ○ 35.3 13.60 2 13.5 4.4 20.0 ○ 35.7 14.45 3 11.0 3.7 21.0 ○ 37.0 13.45 4 11.0 4.5 22.0 ○ 36.2 13.41 5 13.5 4.0 21.5 ○ 33.2 13.25 6 13.5 4.2 19.5 ○ 35.5 13.53 7 10.0 6.0 19.0 ○ 35.0 13.80 8 14.0 4.8 19.0 × 32.3 13.30 9 13.5 5.0 20.0 ○ 36.8 13.75 10 13.0 5.3 20.5 ○ 37.2 13.63 11 10.0 4.2 20.0 ○ 35.1 13.34 12 8.5 5.2 20.0 × 33.5 13.25 13 11.0 4.5 20.5 ○ 35.3 13.57 14 13.0 5.3 20.0 ○ 36.6 13.89 15 12.5 5.0 20.0 × 33.5 12.83 [Table 3] Combination Fresh properties Hardening properties No. Slum p Air volume Temperature separation Compressive strength Static modulus (cm) (%) (° C) Status (N / mm 2 ) (kN / mm 2 ) 1 14.0 4.0 20.0 ○ 35.3 13.60 2 13.5 4.4 20.0 ○ 35.7 14.45 3 11.0 3.7 21.0 ○ 37.0 13.45 4 11.0 4.5 22.0 ○ 36.2 13.41 5 13.5 4.0 21.5 ○ 33.2 13.25 6 13.5 4.2 19.5 ○ 35.5 13.53 7 10.0 6.0 19.0 ○ 35.0 13.80 8 14.0 4.8 19.0 × 32.3 13.30 9 13.5 5.0 20.0 ○ 36.8 13.75 10 13.0 5.3 20.5 ○ 37.2 13.63 11 10.0 4.2 20.0 ○ 35.1 13.34 12 8.5 5.2 20.0 × 33.5 13.25 13 11.0 4.5 20.5 ○ 35.3 13.57 14 13.0 5.3 20.0 ○ 36.6 13.89 15 12.5 5.0 20.0 × 33.5 12.83
【００３３】〔試験結果〕 上記試験結果から、次のことが判る。[Test Results] From the above test results, the following can be understood.
【００３４】（１）圧縮強度 圧縮強度は、水セメント比及び細骨材モルタル比の影響
を受ける。配合No. １〜No. ５において、水セメント比
が大きくなるにつれて圧縮強度が低下し、水セメント比
４０％（配合No. ５）では圧縮強度が３３．２Ｎ／ｍｍ
2 となり、圧縮強度３５Ｎ／ｍｍ2 を満たさない。水セ
メント比２２％（配合No. １）では、圧縮強度が３５．
３Ｎ／ｍｍ2 となり、水セメント比２５％（配合No.
２）の圧縮強度が３５．７Ｎ／ｍｍ2 と大差がなくな
り、強度増進は停止する。また、配合No. １２におい
て、細骨材モルタル比が５７．５％では圧縮強度が３
３．５Ｎ／ｍｍ2 となり、圧縮強度３５Ｎ／ｍｍ2 を満
たさなくなる。(1) Compressive strength The compressive strength is affected by the water cement ratio and the fine aggregate mortar ratio. In the formulations Nos. 1 to 5, the compressive strength decreased as the water cement ratio increased, and the compressive strength was 33.2 N / mm at a water cement ratio of 40% (formulation No. 5).
2 , which does not satisfy the compressive strength of 35 N / mm 2 . At a water cement ratio of 22% (formulation No. 1), the compressive strength is 35.
3N / mm 2 , water-cement ratio 25% (formulation No.
2) The compressive strength of 35.7 N / mm 2 is no big difference, and the increase in strength stops. Further, in the composition No. 12, the compressive strength was 3 when the fine aggregate mortar ratio was 57.5%.
3.5 N / mm 2, and the not satisfy the compressive strength 35N / mm 2.
【００３５】（２）スランプ値及び材料分離抵抗性 スランプ値及び材料分離抵抗性は粗骨材の容積、細骨材
モルタル比及びビニロン繊維混入量の影響を受ける。配
合No. ６〜No. ８において、粗骨材３８０リットル（配
合No. ８）ではスランプ値１４．０ｃｍであるが、骨材
とセメントペーストが分離している。配合No. １２にお
いて、細骨材モルタル比５７．５％では、スランプ値
８．５ｃｍとなり、スランプ値の好適範囲から外れると
同時に、骨材とセメントペーストが分離した。配合No.
１５において、ビニロン繊維混入量０．４％では、骨材
とセメントペーストが分離した。(2) Slump Value and Resistance to Material Separation Slump value and resistance to material separation are affected by the volume of coarse aggregate, the mortar ratio of fine aggregate, and the amount of mixed vinylon fibers. In the formulations Nos. 6 to 8, the slump value was 14.0 cm in 380 liters of the coarse aggregate (formulation No. 8), but the aggregate and the cement paste were separated. In the composition No. 12, when the fine aggregate mortar ratio was 57.5%, the slump value was 8.5 cm, which was out of the preferable range of the slump value, and at the same time, the aggregate and the cement paste were separated. No.
In the case of No. 15, when the vinylon fiber content was 0.4%, the aggregate and the cement paste were separated.
【００３６】[0036]
【発明の効果】請求項１および請求項２記載の発明によ
れば、単位容積質量が小さく圧縮強度の高い超軽量コン
クリートを得ることができる。従って、当該超軽量コン
クリートは、建築用プレキャストパネル等に利用するこ
とができ、建築物の高層化や耐震性の向上に寄与するこ
とができるものである。According to the first and second aspects of the present invention, it is possible to obtain an ultra-lightweight concrete having a small unit volume and a high compressive strength. Therefore, the ultra-lightweight concrete can be used for a precast panel for a building or the like, and can contribute to an increase in the height of a building and an improvement in earthquake resistance.
【００３７】請求項３記載の発明によれば、前記発明の
効果を享受した上で、更に、超軽量コンクリートにおけ
る強度を一層向上させ、かつ、乾燥圧縮によるひび割れ
発生を可及的に抑制することができるものである。According to the third aspect of the present invention, in addition to enjoying the effects of the above-mentioned invention, the strength of the ultra-lightweight concrete is further improved, and the generation of cracks due to dry compression is suppressed as much as possible. Can be done.
Claims (3)
骨材とし、比重が１．３以下で、かつ、圧縮強度が３５
Ｎ／ｍｍ2 以上であることを特徴とする超軽量コンクリ
ート。1. A part or all of the aggregate is made of ceramics aggregate, the specific gravity is 1.3 or less, and the compressive strength is 35.
N / mm 2 or more, ultra-lightweight concrete.
（２）超軽量コンクリート１００容積部当りの粗骨材の
配合量：２８〜３３容積部、および、（３）超軽量コン
クリート１００容積部当りの細骨材容積部（Ｓｖ）／モ
ルタル容積部（Ｍｖ）：５０〜５５％、である請求項１
記載の超軽量コンクリート。2. (1) Water cement ratio: 25% to 35%,
(2) Amount of coarse aggregate per 100 parts by volume of ultralight concrete: 28 to 33 parts by volume, and (3) Fine aggregate volume (Sv) / mortar volume by 100 parts by volume of ultralight concrete ( Mv): 50 to 55%.
Ultralight concrete as described.
対して、最大０．２容積部の短繊維を含有してなること
を特徴とする請求項１または請求項２記載の超軽量コン
クリート。3. The ultralight concrete according to claim 1, wherein a maximum of 0.2 volume parts of short fibers is contained with respect to 100 volume parts of the ultralight concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14820698A JPH11343155A (en) | 1998-05-29 | 1998-05-29 | Ultra-lightweight concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14820698A JPH11343155A (en) | 1998-05-29 | 1998-05-29 | Ultra-lightweight concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11343155A true JPH11343155A (en) | 1999-12-14 |
Family
ID=15447643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14820698A Withdrawn JPH11343155A (en) | 1998-05-29 | 1998-05-29 | Ultra-lightweight concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11343155A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009035594A3 (en) * | 2007-09-10 | 2009-07-09 | Thuan H Bui | Lightweight structural concrete provided various wood properties |
| US7736431B2 (en) | 2005-12-02 | 2010-06-15 | Bui Thuan H | Lightweight structural concrete provided with various wood properties |
-
1998
- 1998-05-29 JP JP14820698A patent/JPH11343155A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7736431B2 (en) | 2005-12-02 | 2010-06-15 | Bui Thuan H | Lightweight structural concrete provided with various wood properties |
| US7799129B2 (en) | 2005-12-02 | 2010-09-21 | Thuan Bui | Lightweight structural concrete provided with various wood properties |
| US8167996B2 (en) | 2005-12-02 | 2012-05-01 | Thuan Bui | Lightweight structural concrete provided with various wood properties |
| WO2009035594A3 (en) * | 2007-09-10 | 2009-07-09 | Thuan H Bui | Lightweight structural concrete provided various wood properties |
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