JPH05301786A - Lightweight concrete - Google Patents
Lightweight concreteInfo
- Publication number
- JPH05301786A JPH05301786A JP10780192A JP10780192A JPH05301786A JP H05301786 A JPH05301786 A JP H05301786A JP 10780192 A JP10780192 A JP 10780192A JP 10780192 A JP10780192 A JP 10780192A JP H05301786 A JPH05301786 A JP H05301786A
- Authority
- JP
- Japan
- Prior art keywords
- lightweight concrete
- synthetic resin
- cement
- concrete
- water
- 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
- 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
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]
【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、軽量であるにもかかわらず高強度
を有し、吸水性が小さく、断熱性および耐久性に優れる
とともに釘打が可能であり、さらに衝撃性およびクラッ
ク防止性に優れた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 high strength, small water absorption, excellent heat insulation and durability, can be nailed, and is excellent in impact resistance and crack prevention even though it is lightweight. .
【０００２】[0002]
【従来の技術】従来より、集合住宅、ホテル、学校、病
院、事務所、劇場、体育館などの各種建築物の構造用材
料としてコンクリートが多用されているが、現在主とし
て用いられている普通コンクリートは、比重が約2.3 と
重く、地震荷重や固定荷重が大きくなるため基礎、柱、
梁などの寸法が大きくなり、そのため建築コストが大き
くなるとともに空間利用率が低下するという欠点があ
る。また、作業性に劣り、型枠への荷重が大きいという
問題もある。さらに、直接に釘打ができないため、釘打
が必要な部分には予め木材を埋め込んでおかなければな
らず、作業が面倒である。2. Description of the Related Art Conventionally, concrete has been widely used as a structural material for various buildings such as apartment houses, hotels, schools, hospitals, offices, theaters, gymnasiums, etc. , The specific gravity is as heavy as about 2.3, and the seismic load and fixed load increase, so foundations, columns,
There are drawbacks that the size of the beam and the like becomes large, which increases the construction cost and reduces the space utilization rate. Further, there is a problem that workability is poor and a load on the mold is large. Further, since it is not possible to directly nail the nails, wood must be embedded in advance in the portions where the nailing is necessary, which is a troublesome work.
【０００３】一方、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、膨張粘土、膨張頁岩
などの人工軽量骨材、および膨張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。On the other hand, in order to reduce the weight, as an aggregate,
Lightweight concrete using lightweight aggregates such as natural lightweight aggregates taken from volcanoes, artificial lightweight aggregates such as expanded clay and expanded shale, and by-product lightweight aggregates such as expanded slag is used. Aerated concrete (ALC) made by curing in an autoclave is also used.
【０００４】[0004]
【発明が解決しようとする課題】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40
kg／cm2 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。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 compression strength of 40.
Since it is as small as kg / cm 2 , it is brittle and easily damaged, so it cannot be used as a structural material. Moreover, high temperature and high pressure steam curing in an autoclave is required, and special equipment is required for manufacturing. Furthermore, as a drawback of both, since the amount of continuous voids is large, the water absorption is large, so the water permeability is large
There is also a problem that water leaks easily and durability such as freeze-thaw resistance and neutralization is poor.
【０００５】本出願人は、叙上の事情に鑑み、さきに軽
量であるにもかかわらず高強度を有し、吸水性が小さ
く、断熱性、耐久性に優れ、かつ、釘打の可能な軽量コ
ンクリートを提案した（特願平4-79628 号）。この軽量
コンクリートは、セメント、水および平均粒径0.1 〜1.
5mm の合成樹脂発泡ビーズの骨材からなる軽量コンクリ
ートであって、水セメント比が45％以下であり、かつ、
前記合成樹脂発泡ビーズの混入率が10〜55容量％である
ことを特徴としており、前述した優れた効果を奏しうる
ものであるが、本発明者らはさらに研究を進め、前記軽
量コンクリートに長さ１〜30mmの繊維を加えたときに、
衝撃性およびクラック防止性がさらに改善されることを
見出し、本発明を完成するに至った。In view of the above circumstances, the applicant of the present invention has a high strength in spite of its light weight, has a low water absorption, is excellent in heat insulation and durability, and is capable of nailing. We proposed a lightweight concrete (Japanese Patent Application No. 4-79628). This lightweight concrete has cement, water and an average particle size of 0.1-1.
Lightweight concrete made of 5 mm synthetic resin foam beads aggregate with a water-cement ratio of 45% or less, and
The mixed ratio of the synthetic resin foam beads is characterized by being 10 to 55% by volume, and it is possible to achieve the above-mentioned excellent effects. When adding 1 to 30 mm fiber,
The inventors have found that the impact resistance and the crack prevention property are further improved, and have completed the present invention.
【０００６】[0006]
【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、セメント、水、平均粒径0.1 〜1.5 mmの合成樹脂
発泡ビーズ、および長さ１〜30mmの繊維からなる軽量コ
ンクリートであって、水セメント比が45％以下であり、
かつ、前記合成樹脂発泡ビーズの混入率が10〜55容量％
であることを特徴としている。The lightweight concrete of the present invention is a lightweight concrete consisting of cement, water, synthetic resin foam beads having an average particle size of 0.1 to 1.5 mm, and fibers having a length of 1 to 30 mm. The cement ratio is 45% or less,
Moreover, the mixing ratio of the synthetic resin foam beads is 10 to 55% by volume.
It is characterized by being.
【０００７】[0007]
【実施例】本発明においては、セメントとして、普通ポ
ルトランドセメント、早強ポルトランドセメントなどの
ポルトランドセメント以外に高炉セメント、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。EXAMPLES In the present invention, as the cement, blast furnace cement, silica cement, fly ash cement and the like can be used in addition to Portland cement such as ordinary Portland cement and early-strength Portland cement, and it is preferable to use them properly according to the application.
【０００８】本発明における合成樹脂発泡ビーズは、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、ポリビニリデンなどを発泡させることによりえら
れ、発泡倍率は本発明においてとくに限定されないが５
倍以上、とくに30〜50倍程度であるのが好ましい。発泡
倍率が５倍未満であると合成樹脂の量が多くなり、不燃
性が劣り、またコンクリート重量が重くなるという不都
合がある。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。The synthetic resin foam beads in the present invention are obtained by foaming polystyrene, polypropylene, polyethylene, acrylonitrile / styrene copolymer, styrene / ethylene copolymer, polyvinylidene, etc., and the expansion ratio in the present invention. 5 but not limited to
It is preferably double or more, especially about 30 to 50 times. If the expansion ratio is less than 5 times, the amount of synthetic resin increases, the nonflammability deteriorates, and the weight of concrete becomes heavy. In the present specification, the “bead” means a spherical, oval, or cylindrical sphere. Of these, spherical spheres are most preferable.
【０００９】前記合成樹脂発泡ビーズは、軽量で吸水性
が小さく、また平均粒径が0.1 〜1.5 mm、好ましくは0.
5 〜1.0 mmと非常に小さく、このためセメントおよび水
と混練する際にローリング効果によりコンクリートの流
動性が良好になる。その結果、良好な作業性を維持しつ
つ水セメント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。ビーズの平均粒径が0.1 mm未満である
と流動性がわるくなり好ましくない。また1.5 mmを超え
ると軽量故に浮力により浮き上がり、セメントペースト
と分離してしまうという問題がある。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 synthetic resin foam beads are lightweight and have low water absorption, and have an average particle size of 0.1 to 1.5 mm, preferably 0.1.
It is very small (5 to 1.0 mm), and when it is mixed with cement and water, the flowability of concrete becomes good due to the rolling effect. As a result, the water-cement 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. If the average particle size of the beads is less than 0.1 mm, the fluidity becomes poor, which is not preferable. Further, if it exceeds 1.5 mm, it is light in weight and floats up due to buoyancy, so that it is separated from cement paste. 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. Further, if the aggregate is large, a defect portion is likely to occur, and stress concentration is applied to that portion, so that the strength of the concrete is reduced by about 20 to 30%.
【００１０】骨材としてビーズに代えて粉砕品を用いる
と、骨材がいびつな形状であるため局部的に応力集中が
かかり、強度が小さくなるという問題や、また計量のば
らつきが大きいため安定した品質のコンクリートがえら
れないという問題がある。When a crushed product is used as the aggregate instead of the beads, stress is locally concentrated because the aggregate has a distorted shape, and the strength is reduced, and there is a large variation in measurement, which is stable. There is a problem that quality concrete cannot be obtained.
【００１１】本発明の軽量コンクリートの水セメント比
は45％以下、好ましくは25〜40％、更に好ましくは30〜
35％である。このように水セメント比が小さいのは、前
述した微小な合成樹脂発泡ビーズのローリング効果によ
るものであり、これにより緻密なコンクリートをうるこ
とができる。水セメント比が45％を超えると収縮が大き
くなり、また吸水性や透水性が大きくなり、また凍結融
解抵抗性や中性化性能がわるく、コンクリートの耐久性
が小さくなる。The water-cement ratio of the lightweight concrete of the present invention is 45% or less, preferably 25-40%, more preferably 30-
35%. Such a low water-cement ratio is due to the rolling effect of the above-mentioned minute synthetic resin foam beads, whereby dense concrete can be obtained. When the water-cement ratio exceeds 45%, shrinkage increases, water absorption and water permeability increase, freeze-thaw resistance and neutralization performance deteriorate, and durability of concrete decreases.
【００１２】合成樹脂発泡ビーズの配合割合は、10〜55
容量％、好ましくは20〜40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％を超えると、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 55.
%, Preferably 20-40% by volume. Mixing ratio is 10
If it is less than volume%, the specific gravity of the concrete cannot be reduced, and the heat insulating property is lowered, and there is a problem that nails cannot be struck.On the other hand, if it exceeds 55 volume%, the strength is reduced, There is a problem that the flame retardance (non-combustibility) is lowered and the pulling resistance of the nail is lowered. The volume% is
It is based on the absolute volume of synthetic resin foam beads, and voids between particles are not considered.
【００１３】本発明において用いることができる繊維と
しては、ビニロン、アクリル、モダアクリル、ナイロ
ン、ポリエステル、岩綿、ポリエチレン、アラミド、耐
アルカリガラス繊維や炭素繊維などをあげることができ
るが、耐アルカリ性、引張強さの点からは炭素繊維、ア
ラミド繊維、ビニロン繊維、モダアクリル繊維、岩綿繊
維を用いるのが好ましい。繊維の長さは１〜30mmであ
り、このうち２〜６mmであるのが好ましい。30mmを超え
ると分散性がわるくなり、コンクリートの流動性が小さ
くなる。一方、１mm未満であると充分な補強効果をうる
ことができない。繊維の太さは、本発明においてとくに
限定されないが、概ね１〜200 デニールが目安である。Examples of the fibers that can be used in the present invention include vinylon, acrylic, modacrylic, nylon, polyester, rock wool, polyethylene, aramid, alkali-resistant glass fiber and carbon fiber. From the viewpoint of strength, it is preferable to use carbon fiber, aramid fiber, vinylon fiber, modacrylic fiber, and rock wool fiber. The length of the fiber is 1 to 30 mm, preferably 2 to 6 mm. When it exceeds 30 mm, the dispersibility becomes poor and the fluidity of concrete becomes small. On the other hand, if it is less than 1 mm, a sufficient reinforcing effect cannot be obtained. The thickness of the fiber is not particularly limited in the present invention, but the standard is about 1 to 200 denier.
【００１４】繊維の配合量は、セメント重量に対して0.
1 〜５重量％、とりわけ0.5 〜1.5重量％であるのが好
ましい。0.1 重量％未満であるとクラック防止効果およ
び衝撃性向上効果が小さく、一方、５重量％を超えると
混合性がわるくなる。The blending amount of fibers is 0 with respect to the weight of cement.
It is preferably from 1 to 5% by weight, especially from 0.5 to 1.5% by weight. If it is less than 0.1% by weight, the effect of preventing cracks and the improvement of impact resistance are small, while if it exceeds 5% by weight, the mixing property becomes poor.
【００１５】本発明の軽量コンクリートは気乾密度が0.
9 〜1.7 ｇ／cm3 と従来の軽量コンクリートに比べて軽
いにもかかわらず、普通コンクリートと同程度の強度を
うることができる。具体的には、圧縮強さは、90〜300
kg／cm2 （たとえば、比重1.25で約180 kg／cm2 ）であ
り、また曲げ強さは30〜70kg／cm2 （たとえば、比重1.
25で約50kg／cm2 ）である。このため柱や床などの構造
材として用いることもできる。The lightweight concrete of the present invention has an air-dry density of 0.
Although it is 9 to 1.7 g / cm 3 which is lighter than conventional lightweight concrete, it is possible to obtain the same strength as ordinary concrete. Specifically, the compressive strength is 90-300
kg / cm 2 (for example, about 180 kg / cm 2 at a specific gravity of 1.25) and a bending strength of 30 to 70 kg / cm 2 (for example, a specific gravity of 1.
It is about 50 kg / cm 2 at 25. Therefore, it can be used as a structural material such as a pillar or a floor.
【００１６】本発明の軽量コンクリートは強度の小さい
小粒径の合成樹脂発泡ビーズを骨材として用い、局部強
度を小さくしているため木材に使用する鉄丸釘が使用で
き、かつ木材と同じ釘の引抜き抵抗力がある。すなわち
木片などを埋め込むことなく直接軽量コンクリートに釘
を打つことができる。これにより、内装材や備品などの
取付を簡単に行うことができる。The lightweight concrete of the present invention uses synthetic resin foam beads having a small particle size and a small strength as an aggregate and has a small local strength, so that an iron round nail used for wood can be used and the same nail as wood. Withdrawal resistant. That is, it is possible to directly nail a lightweight concrete without embedding a piece of wood or the like. This makes it possible to easily attach interior materials and equipment.
【００１７】本発明の軽量コンクリートは、セメント、
水、合成樹脂発泡ビーズおよび繊維以外に所望により
砂、砂利、人工軽量細骨材、人工軽量粗骨材などを配合
させることができる。The lightweight concrete of the present invention is cement,
In addition to water, synthetic resin foam beads, and fibers, sand, gravel, artificial lightweight fine aggregate, artificial lightweight coarse aggregate and the like can be blended if desired.
【００１８】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.
【００１９】実施例１〜６ 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、選別された小粒形の原料樹脂
を予備発泡機内部に投入し、蒸気にて所定の発泡倍率
（40倍）まで発泡させ、平均粒径0.5 〜1.0 mmのポリス
チレン発泡ビーズ（合成樹脂発泡ビーズ）えた。Examples 1 to 6 Polystyrene beads were polymerized while a foaming agent (butane) was added to a styrene monomer, and the selected small particle-shaped raw material resin was charged into the prefoaming machine, and a predetermined expansion ratio was obtained with steam. (40 times) was expanded to obtain polystyrene expanded beads (synthetic resin expanded beads) having an average particle size of 0.5 to 1.0 mm.
【００２０】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、繊維（モダアクリル繊維、２デニー
ル、長さ５mm）および水を表１に示す配合割合でモルタ
ルミキサーにて混練した。混練方法はセメントに水を加
え３分間混練したのち、合成樹脂発泡ビーズおよび繊維
を加えさらに５分間混練した。硬化前のコンクリートに
対し、フロー試験（JIS R 5201準拠）を行った。結果を
表１に示す。ついで混練物を型枠に入れ、テストピース
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, fibers (modacrylic fiber, 2 denier, length 5 mm) and water were kneaded in a mortar mixer in the mixing ratio shown in Table 1. As a kneading method, water was added to cement and the mixture was kneaded for 3 minutes, and then synthetic resin foam beads and fibers were added and further kneaded for 5 minutes. A flow test (JIS R 5201 compliant) was performed on the concrete before hardening. The results are shown in Table 1. Then, the kneaded product was put into a mold to prepare a test piece. After 1 day, the formwork was removed and cured. The curing method was underwater curing.
【００２１】[0021]
【表１】 [Table 1]
【００２２】えられたテストピースについて、４週圧縮
強さ（JIS R 5201準拠）、４週曲げ強さ（JIS R 5201準
拠）および熱伝導率（JIS A 1421準拠）を測定した。結
果をそれぞれ図１〜３に示す。また、収縮性能（JIS A
1129準拠）、中性化性能、吸水性能（実施例１〜３につ
いてのみ）および釘の引抜き抵抗力（JIS Z 2121準拠）
を調べた。結果をそれぞれ表２〜５に示す。さらに実施
例４〜６にかかわるテストピースについて難燃１級基材
試験（JIS A 1321準拠）を調べた。結果を図４に示す。
また、実施例４〜６にかかわるテストピースについて図
５に示すようにして繰返し衝撃曲げ試験を行った。結果
を表６に示す。With respect to the obtained test pieces, 4-week compressive strength (JIS R 5201 compliant), 4-week bending strength (JIS R 5201 compliant) and thermal conductivity (JIS A 1421 compliant) were measured. The results are shown in FIGS. Also, shrinkage performance (JIS A
1129), neutralization performance, water absorption performance (only for Examples 1 to 3) and nail pullout resistance (JIS Z 2121 compliance)
I checked. The results are shown in Tables 2 to 5, respectively. Furthermore, the flame-retardant class 1 base material test (JIS A 1321 compliant) was examined for the test pieces of Examples 4 to 6. The results are shown in Fig. 4.
Further, the test pieces according to Examples 4 to 6 were repeatedly subjected to an impact bending test as shown in FIG. The results are shown in Table 6.
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【表３】 [Table 3]
【００２５】[0025]
【表４】 [Table 4]
【００２６】[0026]
【表５】 [Table 5]
【００２７】[0027]
【表６】 [Table 6]
【００２８】比較例１〜３ 水セメント比を50％にするために配合を表１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
成した。Comparative Examples 1 to 3 Test pieces were prepared in the same manner as in Example 1 except that the composition was changed as shown in Table 1 so that the water cement ratio was 50%.
【００２９】えられたテストピースについて、実施例と
同様にして収縮性能および中性化性能を調べた。結果を
それぞれ表２〜３に示す。The shrinkage performance and neutralization performance of the obtained test piece were examined in the same manner as in the examples. The results are shown in Tables 2 and 3, respectively.
【００３０】比較例４〜１２ 繊維を加えなかった以外は実施例１と同様にしてテスト
ピースを作製した。Comparative Examples 4 to 12 Test pieces were prepared in the same manner as in Example 1 except that fibers were not added.
【００３１】えられたテストピースについて、実施例と
同様にして圧縮強さ、曲げ強さおよび熱伝導率を測定し
た。結果をそれぞれ図１〜３に示す。The test pieces thus obtained were measured for compressive strength, bending strength and thermal conductivity in the same manner as in the examples. The results are shown in FIGS.
【００３２】また、収縮性能、中性化性能、吸水性能お
よび釘を引抜き抵抗力を調べた。結果をそれぞれ表２〜
５に示す。さらに比較例４〜６にかかわるテストピース
について難燃１級基材試験を調べた。結果を図４に示
す。Further, the shrinkage performance, the neutralization performance, the water absorption performance and the nail pullout resistance were examined. The results are shown in Table 2
5 shows. Furthermore, the flame-retardant first-class base material test was conducted on the test pieces of Comparative Examples 4 to 6. The results are shown in Fig. 4.
【００３３】比較例１３ 実施例１においてえられた合成樹脂発泡ビーズを成形機
（金型）内に充填し、蒸気にて加熱融着させ、所定形状
の成形品をえた。ついで成形品を50〜60℃の乾燥室にて
成形品内部の水分を蒸発させた。ついで乾燥した成形品
を粉砕機にて粉砕し、直径に換算して約５mmの大きさの
粉砕品をえた。Comparative Example 13 The synthetic resin foam beads obtained in Example 1 were filled in a molding machine (mold) and heated and fused with steam to obtain a molded product having a predetermined shape. Next, the water content inside the molded product was evaporated in a drying room at 50 to 60 ° C. Then, the dried molded product was crushed by a crusher to obtain a crushed product having a size of about 5 mm in terms of diameter.
【００３４】えられた粉砕品を用いて表１に示す配合で
実施例１と同様にしてテストピースを作製した。A test piece was prepared in the same manner as in Example 1 by using the obtained pulverized product and the composition shown in Table 1.
【００３５】えられたテストピースについて実施例１と
同様にして圧縮強さおよび曲げ強さを測定した。結果を
それぞれ図１〜２に示す。The compressive strength and bending strength of the obtained test piece were measured in the same manner as in Example 1. The results are shown in FIGS.
【００３６】比較例１４ 塩化ビニル樹脂発泡体（バリラックＪ：鐘淵化学工業
（株）製）を粉砕機にて粉砕し、直径に換算して約５mm
の大きさの粉砕品をえた。Comparative Example 14 A vinyl chloride resin foam (Barillac J: manufactured by Kanegafuchi Chemical Industry Co., Ltd.) was crushed with a crusher and converted to a diameter of about 5 mm.
I got a crushed product of the size.
【００３７】えられた粉砕品を用いて表１に示す配分で
実施例１と同様にしてテストピースを作製した。Using the obtained pulverized products, test pieces were produced in the distribution shown in Table 1 in the same manner as in Example 1.
【００３８】えられたテストピースについて実施例１と
同様にして圧縮強さおよび曲げ強さを測定した。結果を
それぞれ図１〜２に示す。The test piece thus obtained was measured for compressive strength and bending strength in the same manner as in Example 1. The results are shown in FIGS.
【００３９】[0039]
【発明の効果】以上説明したとおり、本発明の軽量コン
クリートはセメントおよび水に平均粒径が0.1 〜1.5 mm
の微小な合成樹脂発泡ビーズおよび繊維を特定割合（ビ
ーズの混入率：10〜55容量％）で配合せしめて水セメン
ト比を45％以下としているため、緻密なコンクリートを
うることができ、軽量であるにもかかわらず普通コンク
リートと同程度の強度を有し、吸水性が小さく、断熱
性、耐久性、衝撃性およびクラック防止性にも優れた軽
量コンクリートをうることができる。また、強度の小さ
い微小なビーズを混入して局部強度を小さくしているの
で、釘打が可能である。As described above, the lightweight concrete of the present invention has an average particle size of 0.1 to 1.5 mm in cement and water.
Fine synthetic resin foam beads and fibers are mixed in a specific ratio (bead mixing ratio: 10 to 55% by volume) to make the water-cement ratio 45% or less, so dense concrete can be obtained and it is lightweight. Nevertheless, it is possible to obtain a lightweight concrete which has strength comparable to that of ordinary concrete, has low water absorption, and is excellent in heat insulation, durability, impact resistance and crack prevention. Further, since the local strength is reduced by mixing fine beads having low strength, nailing is possible.
【図１】本発明の軽量コンクリートの圧縮強さを表わす
図である。FIG. 1 is a diagram showing the compressive strength of the lightweight concrete of the present invention.
【図２】本発明の軽量コンクリートの曲げ強さを表わす
図である。FIG. 2 is a diagram showing the bending strength of the lightweight concrete of the present invention.
【図３】本発明の軽量コンクリートの熱伝導率を表わす
図である。FIG. 3 is a diagram showing the thermal conductivity of the lightweight concrete of the present invention.
【図４】本発明の軽量コンクリートの難燃性を表わす図
である。FIG. 4 is a diagram showing the flame retardancy of the lightweight concrete of the present invention.
【図５】軽量コンクリートの繰返し衝撃曲げ試験の説明
図である。FIG. 5 is an explanatory diagram of a repeated impact bending test of lightweight concrete.
フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０４Ｂ 14:38） 2102−4Ｇ Continuation of front page (51) Int.Cl. 5 Identification code Office reference number FI technical display area C04B 14:38) 2102-4G
Claims (3)
合成樹脂発泡ビーズ、および長さ１〜30mmの繊維からな
る軽量コンクリートであって、水セメント比が45％以下
であり、かつ、前記合成樹脂発泡ビーズの混入率が10〜
55容量％であることを特徴とする軽量コンクリート。1. A lightweight concrete comprising cement, water, synthetic resin foam beads having an average particle size of 0.1 to 1.5 mm, and fibers having a length of 1 to 30 mm, wherein the water cement ratio is 45% or less, and The mixing ratio of the synthetic resin foam beads is 10 to
Lightweight concrete characterized by 55% by volume.
1.0 mmである請求項１記載の軽量コンクリート。2. The average particle diameter of the synthetic resin foam beads is 0.5 to.
The lightweight concrete according to claim 1, which is 1.0 mm.
量％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 mixing ratio of the synthetic resin foam beads is 20 to 40% by volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10780192A JPH05301786A (en) | 1992-04-27 | 1992-04-27 | Lightweight concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10780192A JPH05301786A (en) | 1992-04-27 | 1992-04-27 | Lightweight concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05301786A true JPH05301786A (en) | 1993-11-16 |
Family
ID=14468383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10780192A Pending JPH05301786A (en) | 1992-04-27 | 1992-04-27 | Lightweight concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05301786A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004065321A1 (en) * | 2003-01-24 | 2004-08-05 | Halliburton Energy Services, Inc. | Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations |
| US7482309B2 (en) | 2003-11-24 | 2009-01-27 | Halliburton Energy Services, Inc. | Methods of drilling wellbores using variable density fluids comprising coated elastic particles |
| US9051233B2 (en) | 2008-07-29 | 2015-06-09 | Merck Patent Gmbh | Compounds for electronic devices |
-
1992
- 1992-04-27 JP JP10780192A patent/JPH05301786A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004065321A1 (en) * | 2003-01-24 | 2004-08-05 | Halliburton Energy Services, Inc. | Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations |
| US7543642B2 (en) | 2003-01-24 | 2009-06-09 | Halliburton Energy Services, Inc. | Cement compositions containing flexible, compressible beads and methods of cementing in subterranean formations |
| EP3012238A1 (en) * | 2003-01-24 | 2016-04-27 | Halliburton Energy Services, Inc. | Cement compositions containing flexible beads |
| US7482309B2 (en) | 2003-11-24 | 2009-01-27 | Halliburton Energy Services, Inc. | Methods of drilling wellbores using variable density fluids comprising coated elastic particles |
| US9051233B2 (en) | 2008-07-29 | 2015-06-09 | Merck Patent Gmbh | Compounds for electronic devices |
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