JPH06279148A - Lightweight concrete - Google Patents
Lightweight concreteInfo
- Publication number
- JPH06279148A JPH06279148A JP7002793A JP7002793A JPH06279148A JP H06279148 A JPH06279148 A JP H06279148A JP 7002793 A JP7002793 A JP 7002793A JP 7002793 A JP7002793 A JP 7002793A JP H06279148 A JPH06279148 A JP H06279148A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- lightweight concrete
- resin foam
- water
- 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.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000011230 binding agent Substances 0.000 claims abstract description 14
- 239000006260 foam Substances 0.000 claims description 33
- 229920003002 synthetic resin Polymers 0.000 claims description 29
- 239000000057 synthetic resin Substances 0.000 claims description 29
- 239000011324 bead Substances 0.000 claims description 21
- 239000004568 cement Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 8
- 239000004794 expanded polystyrene Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 abstract description 8
- 238000005187 foaming Methods 0.000 abstract description 7
- 239000012615 aggregate Substances 0.000 description 9
- 239000011398 Portland cement Substances 0.000 description 6
- 238000004898 kneading Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Natural products C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000001723 curing Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000011400 blast furnace cement Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000002537 cosmetic Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000004088 foaming agent Substances 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920006327 polystyrene foam Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/08—Macromolecular compounds porous, e.g. expanded polystyrene beads or microballoons
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (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]
【産業上の利用分野】本発明は軽量コンクリートに関す
る。さらに詳しくは、圧縮強度が強く、安定した比重を
うることができ、設計厚さ通りに施工でき、さらに強度
低下を防止することができる軽量コンクリートに関す
る。FIELD OF THE INVENTION The present invention relates to lightweight concrete. More specifically, the present invention relates to lightweight concrete that has a high compressive strength, can obtain a stable specific gravity, can be constructed according to the design thickness, and can prevent a decrease in strength.
【０００２】[0002]
【従来の技術】従来より、建物の軽量化を図るために、
骨材として、火山などよりとれる天然軽量骨材、膨脹粘
土、膨脹頁岩などの人工軽量骨材、および膨脹スラグな
どの副産軽量骨材からなる軽量骨材を用いた軽量コンク
リートが用いられている。また、オートクレーブで養生
して作った気泡コンクリート（ＡＬＣ）も用いられてい
る。2. Description of the Related Art Conventionally, in order to reduce the weight of a building,
As the aggregate, lightweight concrete using natural lightweight aggregate obtained from volcanoes, artificial lightweight aggregate such as expanded clay and expanded shale, and lightweight aggregate composed of by-product lightweight aggregate such as expanded slag is used. . Aerated concrete (ALC) made by curing in an autoclave is also used.
【０００３】しかしながら、軽量コンクリートは、比重
が１．４〜２．０であり、軽量化が不充分である。ま
た、混練時あるいは打ち込み時に軽量骨材が浮き上って
分離してしまい、均質なコンクリートがえにくいという
問題がある。また、ＡＬＣは圧縮強さが４０ｋｇ／ｃｍ
2 程度と小さく、脆く、破損しやすいため、構造材とし
て用いることができない。またオートクレーブでの高温
高圧蒸気養生が必要であり、製造に際し特殊な設備が必
要である。さらに、両者の欠点として、連続空げき量が
多いため、吸水性が大きいので透水性が大きく、水もれ
がしやすい、また凍結融解抵抗性、中性化などの耐久性
が劣るという問題もある。[0003] However, lightweight concrete has a specific gravity of 1.4 to 2.0 and is insufficient in weight reduction. There is also a problem that the lightweight aggregate floats up and separates during kneading or driving, which makes it difficult to obtain homogeneous concrete. ALC has a compressive strength of 40 kg / cm.
It cannot be used as a structural material because it is as small as 2 and is brittle and easily damaged. Moreover, high temperature and high pressure steam curing in an autoclave is required, and special equipment is required for manufacturing. Furthermore, as a disadvantage of both, since there is a large amount of continuous voids, the water absorption is large, the water permeability is large, water leakage is easy to occur, and freeze-thaw resistance, neutralization etc. durability is also inferior is there.
【０００４】かかる問題を解決するものとして、発泡倍
率が３０〜７０倍程度の合成樹脂発泡ビーズや粉砕品を
用いてコンクリートやモルタルの軽量化を図ることが提
案されている（たとえば特公昭５１−１６４５４号公
報、特公昭６３−３９５３６号公報など）。As a solution to this problem, it has been proposed to reduce the weight of concrete or mortar by using synthetic resin foam beads or crushed products having an expansion ratio of about 30 to 70 (for example, Japanese Patent Publication No. 16454, Japanese Patent Publication No. 63-39536, etc.).
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、コンク
リートの高強度化および耐久性向上を図るために水セメ
ント比を小さくしたばあい、従来の発泡倍率では混練時
に合成樹脂発泡体が収縮してしまい、安定した比重をう
ることができなかった。また、ポンプを用いてコンクリ
ートを打設する際に、ポンプ圧送圧力（通常、約１０〜
８０ｋｇｆ／ｃｍ2 である）により、従来の発泡倍率で
は合成樹脂発泡体が収縮し、この点においても安定した
比重をうることができなかった。However, when the water-cement ratio is reduced in order to increase the strength and durability of concrete, the synthetic resin foam shrinks during kneading at the conventional expansion ratio, It was not possible to obtain a stable specific gravity. In addition, when pouring concrete using a pump, the pump pressure (usually about 10
80 kgf / cm 2 ), the synthetic resin foam contracted at the conventional expansion ratio, and in this respect also, stable specific gravity could not be obtained.
【０００６】表１は発泡ポリスチレンの圧縮強度（４％
歪）を示しており、表１より、発泡倍率が約１５倍をこ
えるとポンプの圧送圧に耐えることができないことがわ
かる。Table 1 shows the compressive strength of expanded polystyrene (4%
Strain) is shown, and it can be seen from Table 1 that the pumping pressure of the pump cannot be withstood when the expansion ratio exceeds about 15 times.
【０００７】[0007]
【表１】 [Table 1]
【０００８】そして、混練や圧送によって収縮した合成
樹脂発泡体がコンクリートの硬化前に復元することによ
り、いわゆる後ぶくれ現象が生じ、設計通りのコンクリ
ート厚さをうることができず、また強度も２０〜５０％
程度低下してしまっていた。When the synthetic resin foam contracted by kneading or pumping is restored before the concrete is cured, a so-called back swelling phenomenon occurs, and the concrete thickness as designed cannot be obtained, and the strength is also high. 20-50%
It had fallen to some extent.
【０００９】本発明は、叙上の事情に鑑み、前記収縮に
起因する比重およびコンクリート厚さの不安定さや強度
低下を防止した軽量コンクリートを提供することを目的
とする。In view of the above circumstances, it is an object of the present invention to provide a lightweight concrete which prevents the instability of specific gravity and concrete thickness and the decrease in strength due to the shrinkage.
【００１０】[0010]
【課題を解決するための手段】本発明の軽量コンクリー
トは、結合材、水および合成樹脂発泡体からなる軽量コ
ンクリートであって、合成樹脂発泡体の発泡倍率が２〜
１５倍であることを特徴としている。The lightweight concrete of the present invention is a lightweight concrete comprising a binder, water and a synthetic resin foam, and the expansion ratio of the synthetic resin foam is 2 to 2.
It is characterized by being 15 times.
【００１１】[0011]
【実施例】本発明においては、結合材として、セメント
を用いるのが好ましいが、セメント以外にもせっこう、
石灰、ケイ酸カルシウム、焼きせっこう、しっくい、接
着剤などを用いることができる。EXAMPLES In the present invention, it is preferable to use cement as a binder, but gypsum other than cement,
Lime, calcium silicate, gypsum, plaster, adhesive, etc. can be used.
【００１２】セメントとしては、普通ポルトランドセメ
ント、早強ポルトランドセメント、超早強ポルトランド
セメント、中庸熱ポルトランドセメントなどのポルトラ
ンドセメントや、高炉セメント、シリカセメント、フラ
イアッシュセメントなどの混合セメントや、超早強セメ
ント、膨脹セメント、化粧用セメント（白色セメント、
カラーセメント）などの特殊セメントや、アルミナセメ
ントなどを用いることができ、用途により使い分けるの
が好ましい。As the cement, ordinary Portland cement, early strength Portland cement, super early strength Portland cement, medium heat Portland cement and other portland cement, mixed cement such as blast furnace cement, silica cement and fly ash cement, and ultra early strength. Cement, expansion cement, cosmetic cement (white cement,
Special cements such as color cement) and alumina cement can be used, and it is preferable to use properly depending on the application.
【００１３】本発明における合成樹脂発泡体は、ポリス
チレン、ポリプロピレン、ポリエチレン、アクリルニト
リル・スチレン共重合体、スチレン・エチレン共重合
体、ポリ塩化ビニリデンなどを発泡させることによりえ
られ、その発泡倍率は２〜１５倍の範囲である。発泡倍
率が２倍未満であると、えられたコンクリートの不燃性
が低下するとともに軽量化が困難になるので好ましくな
い。一方、発泡倍率が１５倍をこえると前述したように
収縮に起因する種々の弊害が発生しはじめるので好まし
くない。なお、強度、軽量化、コスト面から発泡倍率は
５〜１０倍が好ましい。The synthetic resin foam in the present invention is obtained by foaming polystyrene, polypropylene, polyethylene, acrylonitrile / styrene copolymer, styrene / ethylene copolymer, polyvinylidene chloride, etc., and the expansion ratio is 2 The range is up to 15 times. When the expansion ratio is less than 2, the non-combustibility of the obtained concrete decreases and it becomes difficult to reduce the weight, which is not preferable. On the other hand, when the expansion ratio exceeds 15 times, various problems due to shrinkage start to occur as described above, which is not preferable. The foaming ratio is preferably 5 to 10 from the viewpoints of strength, weight reduction and cost.
【００１４】合成樹脂発泡体は、ローリング効果により
水結合材比（水セメント比）を小さくすることができる
という点より、合成樹脂発泡体ビーズであるのが好まし
い。ビーズの方が粉砕品に比べて流動性がよく施工しや
すい。また粉砕品に比べ２０〜３０％程度強度が大きく
なる。粉砕品のばあい、計量のバラツキが多く、安定し
た品質がえにくい。The synthetic resin foam is preferably synthetic resin foam beads because the ratio of water binder (water cement ratio) can be reduced by the rolling effect. Beads have better fluidity and are easier to construct than crushed products. Further, the strength is about 20 to 30% higher than that of the crushed product. In the case of crushed products, there are many variations in weighing, making it difficult to obtain stable quality.
【００１５】なお、本明細書において「ビーズ」とは球
形や長円形や円筒形の球を意味するものである。なお、
このうち球形の球が最も好ましい。In the present specification, the "bead" means a spherical, oval or cylindrical sphere. In addition,
Of these, spherical spheres are most preferable.
【００１６】合成樹脂発泡ビーズの平均粒径は、２ｍｍ
以下、とりわけ０．５〜１．０ｍｍであるのが好まし
く、これにより結合材および水と混練する際にローリン
グ効果によってコンクリートの流動性を一層向上させる
ことができる。その結果、良好な作業性を維持しつつ水
結合材比を小さくすることができる。こうしてえられた
コンクリートは、連続空げきが小さく、緻密で収縮が小
さく、また吸水性および透水性が小さく、また凍結融解
抵抗性や中性化性能に優れた高耐久性の軽量コンクリー
トである。平均粒径が２ｍｍ以上であると浮力により分
離しやすく、強度にバラツキが生じやすい。この分離は
増粘剤などの混和剤を用いることによりある程度は防止
できるが、完全ではなく、また混和剤の使用により施工
性がわるくなるという問題が生じてしまう。また、骨材
が大きいばあい、欠陥部が生じやすくなり、その部分に
応力集中がかかるためコンクリートの強度が２０〜３０
％程度小さくなってしまう。The average particle size of the synthetic resin foam beads is 2 mm.
In the following, it is particularly preferably 0.5 to 1.0 mm, which can further improve the fluidity of concrete due to the rolling effect when kneading with the binder and water. As a result, the water binder ratio can be reduced while maintaining good workability. The concrete thus obtained is a highly durable lightweight concrete having small continuous voids, denseness, small shrinkage, low water absorption and water permeability, and excellent freeze-thaw resistance and neutralizing performance. When the average particle size is 2 mm or more, the particles are easily separated due to buoyancy and the strength tends to vary. This separation can be prevented to some extent by using an admixture such as a thickener, but it is not perfect, and the use of the admixture causes a problem that workability becomes poor. In addition, if the aggregate is large, a defective portion is likely to occur, and stress concentration is applied to that portion, so that the concrete strength is 20 to 30.
It will be reduced by about%.
【００１７】また、合成樹脂発泡ビーズを用いるばあ
い、水結合材比は４５％以下、とりわけ３０〜４０％で
あるのが好ましい。こうすることにより、コンクリート
の各種品質、すなわち強度特性、中性化特性、凍結融解
抵抗性、水密性などを向上させることができる。なお、
水セメント比が３０％未満のばあい、粘性が高く、施工
性がわるくなる。前記合成樹脂発泡ビーズのうち、小粒
径の真球のビーズをえやすく、また燃焼時に毒性ガスが
出ない、また圧縮強度が比較的大きく、低コストである
という点より、発泡ポリスチレンビーズを採用するのが
好ましい。When synthetic resin foam beads are used, the water binder ratio is preferably 45% or less, more preferably 30 to 40%. By doing so, various qualities of concrete, that is, strength characteristics, neutralization characteristics, freeze-thaw resistance, watertightness, etc. can be improved. In addition,
When the water cement ratio is less than 30%, the viscosity is high and the workability becomes poor. Among the synthetic resin foam beads, expanded polystyrene beads are used because it is easy to obtain spherical beads with a small particle size, no toxic gas is emitted during combustion, and the compressive strength is relatively large and the cost is low. Preferably.
【００１８】なお、合成樹脂発泡体に代えて無機発泡体
を用いることも考えられるが、無機発泡体のばあい、混
練時やポンプ圧送時に破損しやすく、とくに水結合材比
を小さくしたばあいにその傾向が顕著となり、所定の密
度をうるのが難しい。そして、それを解消するために発
泡倍率の小さな無機発泡体（密度は約０．５ｇ／ｃｍ3
以上）を用いる必要があり、軽量化しにくくなる。ま
た、無機発泡体のばあい、吸水量が多く、調合時にこの
吸水分の補正をしなければならないなど取り扱うのに手
間がかかるという問題もある。Although it is possible to use an inorganic foam in place of the synthetic resin foam, in the case of an inorganic foam, it is easily damaged during kneading or pumping, and especially when the water binder ratio is reduced. This tendency becomes remarkable, and it is difficult to obtain a predetermined density. In order to eliminate this, an inorganic foam with a small expansion ratio (density of about 0.5 g / cm 3
It is necessary to use the above), and it becomes difficult to reduce the weight. In addition, in the case of an inorganic foam, there is a problem that it takes a lot of time to handle, such as a large amount of water absorption, and this water absorption must be corrected during preparation.
【００１９】合成樹脂発泡ビーズの配合割合は、１０〜
５５容量％、好ましくは２５〜５０、さらに好ましくは
３０〜４５容量％である。配合割合が１０容量％未満で
あると、コンクリートの比重を小さくすることができ
ず、また断熱性が低下し、さらに釘が打てないという問
題があり、一方、５５容量％をこえると、強度が低下
し、難燃性（不燃性）が低下し、釘の引抜き抵抗力が低
下するという問題がある。なお、前記容量％は、合成樹
脂発泡ビーズの絶対容積をベースとするものであり、粒
子間の空げきは考慮していない。The compounding ratio of the synthetic resin foam beads is 10 to 10.
It is 55% by volume, preferably 25 to 50%, more preferably 30 to 45% by volume. If the mixing ratio is less than 10% by volume, there is a problem that the specific gravity of concrete cannot be reduced, the heat insulating property is deteriorated, and nails cannot be driven. On the other hand, if it exceeds 55% by volume, the strength is high. And the flame retardancy (incombustibility) are lowered, and the nail pullout resistance is lowered. The volume% is based on the absolute volume of the synthetic resin foam beads, and voids between particles are not taken into consideration.
【００２０】本発明の軽量コンクリートは、結合材、水
および合成樹脂発泡体以外に所望により砂、砂利、人工
軽量細骨材、人工軽量粗骨材、繊維、接着剤などを配合
させることができる。The lightweight concrete of the present invention may contain sand, gravel, artificial lightweight fine aggregate, artificial lightweight coarse aggregate, fiber, adhesive and the like in addition to the binder, water and synthetic resin foam if desired. .
【００２１】つぎに実施例に基づき本発明の軽量コンク
リートを説明するが、本発明はもとよりかかる実施例の
みに限定されるものではない。Next, the lightweight concrete of the present invention will be explained based on examples, but the present invention is not limited to such examples as a matter of course.
【００２２】実施例１〜２ スチレンモノマーに発泡剤（ブタン）を添加しつつポリ
スチレンビーズを重合し、選別された小粒径の原料樹脂
を予備発泡機内部に投入し、蒸気にて所定の発泡倍率
（実施例１：５倍、実施例２：１０倍）まで発泡させ、
ポリスチレン発泡ビーズ（合成樹脂発泡ビーズ）をえ
た。Examples 1 and 2 Polystyrene beads were polymerized while adding a foaming agent (butane) to a styrene monomer, and the selected raw material resin having a small particle size was charged into the pre-foaming machine, and a predetermined foaming was performed with steam. Foam up to a magnification (Example 1: 5 times, Example 2:10 times),
Polystyrene foam beads (synthetic resin foam beads) were obtained.
【００２３】えられた合成樹脂発泡ビーズ、普通ポルト
ランドセメント、水および高性能ＡＥ減水剤を表２に示
す配合割合でオムニミキサーにて混練した。混練方法は
セメントに水および高性能ＡＥ減水剤を加え１分間混練
したのち、合成樹脂発泡ビーズを加えさらに３分間混練
した。えられた混練物を型枠に入れ、テストピース（φ
１００×２００ｍｍ）を作製した。１日後型枠をはずし
養生した。養生方法は水中養生とした。The resulting synthetic resin foam beads, ordinary Portland cement, water and a high-performance AE water reducing agent were kneaded in an omni mixer at a mixing ratio shown in Table 2. As a kneading method, water and a high-performance AE water reducing agent were added to cement and kneaded for 1 minute, then synthetic resin foam beads were added and kneaded for another 3 minutes. Put the obtained kneaded product in the mold and put the test piece (φ
100 × 200 mm) was produced. After 1 day, the formwork was removed and cured. The curing method was underwater curing.
【００２４】えられたテストピースについて、ＪＩＳ
Ａ １１０８の「コンクリートの圧縮強度試験方法」に
基づいて４週圧縮強度を測定した。結果を表２に示す。Regarding the obtained test piece, JIS
The 4-week compressive strength was measured based on the “compressive strength test method for concrete” of A 1108. The results are shown in Table 2.
【００２５】[0025]
【表２】 [Table 2]
【００２６】比較例１〜４ 合成樹脂発泡体の発泡倍率、形状およびコンクリートの
配合を表２に示すように変えた以外は実施例１と同様に
してテストピースを作製し、４週圧縮強度を測定した。
結果を表２に示す。Comparative Examples 1 to 4 Test pieces were prepared in the same manner as in Example 1 except that the expansion ratio, shape, and mix of concrete of the synthetic resin foam were changed as shown in Table 2, and the compressive strength was measured for 4 weeks. It was measured.
The results are shown in Table 2.
【００２７】[0027]
【発明の効果】以上説明したとおり、本発明の軽量コン
クリートは発泡倍率が２〜１５倍の低発泡の合成樹脂発
泡体を用いているので、圧縮強度が強く、従来の合成樹
脂発泡体のような収縮に起因する比重の不安定さや設計
厚さの不安定さを解消することができ、また圧縮強度の
低下を防ぐことができる。As described above, since the lightweight concrete of the present invention uses a low-foaming synthetic resin foam having a foaming ratio of 2 to 15, it has a high compressive strength, and is similar to a conventional synthetic resin foam. The instability of the specific gravity and the instability of the design thickness due to the large shrinkage can be eliminated, and the reduction of the compressive strength can be prevented.
Claims (10)
る軽量コンクリートであって、合成樹脂発泡体の発泡倍
率が２〜１５倍であることを特徴とする軽量コンクリー
ト。1. A lightweight concrete comprising a binder, water and a synthetic resin foam, wherein the synthetic resin foam has an expansion ratio of 2 to 15 times.
１記載の軽量コンクリート。2. The lightweight concrete according to claim 1, wherein the expansion ratio is 5 to 10 times.
ズである請求項１または２記載の軽量コンクリート。3. The lightweight concrete according to claim 1, wherein the synthetic resin foam is synthetic resin foam beads.
記載の軽量コンクリート。4. The water binder ratio is 45% or less.
Lightweight concrete as described.
３または４記載の軽量コンクリート。5. The lightweight concrete according to claim 3, wherein the water binder ratio is 30 to 40%.
ｍｍ以下である請求項３、４または５記載の軽量コンク
リート。6. The synthetic resin foam beads have an average particle diameter of 2
The lightweight concrete according to claim 3, 4 or 5, having a size of not more than mm.
０．５〜１．０ｍｍである請求項３、４、５または６記
載の軽量コンクリート。7. The lightweight concrete according to claim 3, wherein the synthetic resin foam beads have an average particle diameter of 0.5 to 1.0 mm.
レンビーズである請求項３、４、５、６または７記載の
軽量コンクリート。8. The lightweight concrete according to claim 3, 4, 5, 6, or 7, wherein the synthetic resin expanded beads are expanded polystyrene beads.
２、３、４、５、６、７または８記載の軽量コンクリー
ト。9. The binder according to claim 1, wherein the binder is cement.
Lightweight concrete according to 2, 3, 4, 5, 6, 7 or 8.
でなる請求項１、２、３、４、５、６、７、８または９
記載の軽量コンクリート。10. The method of claim 1, 2, 3, 4, 5, 6, 7, 8 or 9 further comprising sand and / or gravel.
Lightweight concrete as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002793A JPH06279148A (en) | 1993-03-29 | 1993-03-29 | Lightweight concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7002793A JPH06279148A (en) | 1993-03-29 | 1993-03-29 | Lightweight concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06279148A true JPH06279148A (en) | 1994-10-04 |
Family
ID=13419711
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7002793A Pending JPH06279148A (en) | 1993-03-29 | 1993-03-29 | Lightweight concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06279148A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19730106C2 (en) * | 1996-11-21 | 2002-07-18 | Fujitsu Ltd | Paper transfer control device used for optical image readers |
| JP2008534418A (en) * | 2005-03-22 | 2008-08-28 | ノバ・ケミカルズ・インコーポレイテツド | Lightweight concrete composition |
-
1993
- 1993-03-29 JP JP7002793A patent/JPH06279148A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19730106C2 (en) * | 1996-11-21 | 2002-07-18 | Fujitsu Ltd | Paper transfer control device used for optical image readers |
| JP2008534418A (en) * | 2005-03-22 | 2008-08-28 | ノバ・ケミカルズ・インコーポレイテツド | Lightweight concrete composition |
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