JP2000351680A - Lightweight concrete - Google Patents
Lightweight concreteInfo
- Publication number
- JP2000351680A JP2000351680A JP16020599A JP16020599A JP2000351680A JP 2000351680 A JP2000351680 A JP 2000351680A JP 16020599 A JP16020599 A JP 16020599A JP 16020599 A JP16020599 A JP 16020599A JP 2000351680 A JP2000351680 A JP 2000351680A
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- lightweight
- scraps
- lightweight cellular
- cellular 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
- C04B18/167—Recycled materials, i.e. waste materials reused in the production of the same materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Porous Artificial Stone Or Porous Ceramic Products (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、軽量性と強度を有
する軽量コンクリートに関し、より詳しくはコンクリー
トの組成の一部として軽量気泡コンクリートの粉末を含
む軽量コンクリートに関する。なお本発明においてコン
クリートとは、粗骨材を含まないモルタルも含むものと
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight concrete having lightness and strength, and more particularly to a lightweight concrete containing a lightweight cellular concrete powder as a part of the concrete composition. In the present invention, the concrete includes mortar containing no coarse aggregate.
【０００２】[0002]
【従来の技術】コンクリートは、セメント、粗骨材、細
骨材、水、および必要に応じて混和材料を練り混ぜて一
体化したものであり、このコンクリートを用いてコンク
リートパネル、コンクリートブロックやコンクリート構
造物がつくられる。2. Description of the Related Art Concrete is obtained by kneading cement, coarse aggregate, fine aggregate, water and, if necessary, an admixture material and integrating them. Concrete is used for concrete panels, concrete blocks and concrete. A structure is created.
【０００３】このコンクリートは、圧縮強度および剛
性が大きい、耐久性、耐火性が優れている、任意の
形状および寸法の部材をつくることができる、構造物
を単体的につくることができる、などの長所がある反
面、自重が大きく長大スパンの橋梁や大面積の壁体な
どをつくることがむつかしい、乾燥により収縮するこ
とと引張強度が小さいことから、ひび割れが生じやす
い、取り壊しが困難である、などの短所を有してい
る。[0003] This concrete has high compressive strength and rigidity, excellent durability and fire resistance, can make members of any shape and size, can make a structure alone, and the like. Despite its strengths, it is difficult to make a bridge with a large weight and a long span, a large area wall, etc.It is easy to crack and difficult to demolish due to shrinkage due to drying and low tensile strength, etc. The disadvantages are:
【０００４】これらの短所のなかでも、コンクリート構
造物の施工上の制約に最も大きく影響するコンクリート
の自重の軽減に関しては、従来から無機質系軽量骨材を
配合する方法や有機発泡体を粉砕、粒化したものを配合
する方法などの種々の軽量化方策が実施されている。ま
た、コンクリート原料に発泡剤を加えて内部に多数の気
泡を形成させた軽量気泡コンクリートも実用されてい
る。Among these disadvantages, regarding the reduction of the weight of concrete, which has the greatest effect on the restrictions on the construction of concrete structures, a method of blending an inorganic lightweight aggregate, a method of pulverizing an organic foam, and a method of pulverizing an organic foam have been conventionally used. Various measures for reducing the weight, such as a method of compounding the compound, have been implemented. Also, lightweight cellular concrete in which a foaming agent is added to a concrete raw material to form a large number of cells inside has been put to practical use.
【０００５】軽量気泡コンクリートは一般にＡＬＣと称
されており、石灰質原料と珪酸質原料の粉末を混合した
ものに適量の水とアルミニウム粉末などの発泡剤を加え
て混練し、スラリーとしたものを型枠に注入し、発泡凝
固させた後、得られた半可塑物をオートクレーブ中で高
温高圧により蒸気養生して硬化させることによって得ら
れるもので、軽量、耐火、断熱などの諸性質が優れてい
るので、パネル状あるいはブロック状の建材として広範
囲に用いられている。[0005] Light-weight cellular concrete is generally called ALC, and a mixture of a powder of calcareous raw material and a powder of siliceous raw material, an appropriate amount of water and a foaming agent such as aluminum powder, and the like are kneaded to form a slurry. It is obtained by injecting into a frame, foaming and coagulating, and then curing and curing the obtained semi-plastic at high temperature and pressure in an autoclave, and has excellent properties such as light weight, fire resistance and heat insulation. Therefore, it is widely used as a panel-shaped or block-shaped building material.
【０００６】[0006]
【発明が解決すべき課題】ところで、建材用の軽量気泡
コンクリートは、製造工程で発生した屑材、構造物や建
築物を構築する際に発生した端材、解体後の廃材など
（以下、廃材と総称する）の処置に問題がある。普通コ
ンクリートの廃材は、これを破砕してコンクリート原料
として再利用することが容易であるが、軽量気泡コンク
リートの廃材は内部に多数の気泡が存在しているので普
通コンクリートに比して強度が低く、これを普通コンク
リート用の原料として再利用した場合は、コンクリート
としての強度が不足するので、普通コンクリート用の原
料として再利用することができない。Problems to be Solved by the Invention By the way, lightweight cellular concrete for building materials includes scrap materials generated in the manufacturing process, scraps generated when constructing structures and buildings, and waste materials after dismantling (hereinafter referred to as waste materials). Problem). Waste of ordinary concrete can be easily crushed and reused as a raw material for concrete.However, waste of lightweight cellular concrete has a lower strength than ordinary concrete because there are many bubbles inside. When this is reused as a raw material for ordinary concrete, the strength of the concrete is insufficient, so that it cannot be reused as a raw material for ordinary concrete.
【０００７】他方、特開平４−３５７１４９号公報や特
開平５−３１９８７６号公報で、軽量気泡コンクリート
の廃材を粉砕して再び軽量気泡コンクリート用原料とし
て再利用する方法が提案されている。この方法は、廃材
を粒径１．２ｍｍ以下に粉砕した乾燥粉体を軽量気泡コ
ンクリート用原料として用いる方法である。しかし、こ
の方法でも再利用する対象は軽量気泡コンクリートのみ
であり、原料として配合可能な範囲は２０重量％以内で
あるので、大量に発生する廃材のごく一部しか再利用す
ることができず、大部分の廃材は産業廃棄物として廃棄
処分されているのが実状である。On the other hand, JP-A-4-357149 and JP-A-5-319876 propose a method of pulverizing waste material of lightweight cellular concrete and reusing it as a raw material for lightweight cellular concrete. In this method, a dry powder obtained by pulverizing waste material to a particle size of 1.2 mm or less is used as a raw material for lightweight cellular concrete. However, even in this method, only lightweight cellular concrete can be reused, and the range that can be blended as a raw material is within 20% by weight, so that only a small part of a large amount of waste material can be reused. Most waste materials are actually disposed of as industrial waste.
【０００８】本発明が解決すべき課題は、軽量気泡コン
クリートの廃材の再利用範囲を拡大するとともに、この
再利用を通じて普通コンクリートの軽量化をはかること
にある。The problem to be solved by the present invention is to extend the range of reuse of waste material of lightweight cellular concrete and to reduce the weight of ordinary concrete through this reuse.
【０００９】[0009]
【課題を解決するための手段】本発明者は、普通コンク
リートに要求される強度を維持したうえでコンクリート
自重を軽量化する方策に関して、コンクリート原料とし
て軽量気泡コンクリートの廃材を利用することについて
の実験研究を重ね、軽量気泡コンクリート中の気泡がコ
ンクリート強度にほとんど影響しない程度の微粒に廃材
を粉砕した粉末を使用することによって、普通コンクリ
ートの強度を維持したうえで軽量化を達成できることを
確認した。Means for Solving the Problems The present inventor has conducted an experiment on using waste material of lightweight cellular concrete as a raw material for concrete with respect to a measure for reducing the weight of concrete while maintaining the strength required for ordinary concrete. Through repeated studies, it was confirmed that the weight reduction can be achieved while maintaining the strength of ordinary concrete by using the powder obtained by grinding waste materials into fine particles whose air bubbles in lightweight cellular concrete hardly affect the concrete strength.
【００１０】すなわち本発明にかかるコンクリートは、
発泡剤を含まないコンクリート原料に、軽量気泡コンク
リートの廃材を粒径１．０ｍｍ以下に粉砕した粉末を前
記コンクリート原料中の固形分の１５〜３０重量％の範
囲内で混合させてなる軽量コンクリートである。That is, the concrete according to the present invention comprises:
A lightweight concrete material obtained by mixing a powdered material obtained by pulverizing a waste material of lightweight cellular concrete to a particle diameter of 1.0 mm or less with a concrete raw material containing no foaming agent in a range of 15 to 30% by weight of a solid content in the concrete raw material. is there.
【００１１】ここで、発泡剤を含まないコンクリート原
料とは、軽量気泡コンクリートや発泡モルタルを製造す
るときに気泡発生用として用いられるアルミニウム粉末
などの発泡剤や起泡剤を含まない原料のことである。本
発明のコンクリートは、軽量気泡コンクリートや発泡モ
ルタルのような低強度のコンクリートではなく、材令４
週強度が２１Ｎ／ｍｍ2 以上の普通コンクリートを適用
対象とする。The term "concrete raw material containing no foaming agent" means a raw material containing no foaming agent or foaming agent such as aluminum powder used for producing bubbles when producing lightweight cellular concrete or foamed mortar. is there. The concrete of the present invention is not low-strength concrete such as lightweight cellular concrete or foam mortar, but has a material age of 4.
Applicable to ordinary concrete having a weekly strength of 21 N / mm 2 or more.
【００１２】また、コンクリート原料中の固形分とは、
普通コンクリートの原料として用いられるセメント、骨
材（粗骨材、細骨材）、混和材、および本発明において
用いる軽量気泡コンクリート廃材の粉末の総量を指す。
軽量気泡コンクリート廃材の粉末とは、軽量気泡コンク
リートの製造工程で発生した屑材、軽量気泡コンクリー
トのパネルやブロックを構造物や建築物を構築する際に
使用したときに発生した端材、解体後の廃材など（これ
らを総称して廃材という）を粉砕し、粒径１．０ｍｍ以
下の微粒とした粉末を指す。The solid content in the raw material for concrete is
It refers to the total amount of powder of cement, aggregate (coarse aggregate, fine aggregate), admixture, and lightweight lightweight concrete waste used in the present invention used as raw materials for ordinary concrete.
Lightweight cellular concrete waste powder refers to scrap materials generated in the process of manufacturing lightweight cellular concrete, scraps generated when using lightweight cellular concrete panels and blocks when constructing structures and buildings, and after scrapping. And the like (hereinafter collectively referred to as waste materials) are pulverized into fine powder having a particle size of 1.0 mm or less.
【００１３】軽量気泡コンクリート廃材の粉末の粒径を
１．０ｍｍ以下に限定する理由は、粒径の大きい粉体は
それだけ多くの気泡を内部に含んでおり、これをコンク
リート原料として用いるとコンクリート製品の強度が低
下するので、強度低下が実用的に許容できる範囲とし
て、粉末の最大粒径を１．０ｍｍ、好ましくは最大粒径
０．８ｍｍ以下の微粒とする。The reason for limiting the particle size of the powder of the lightweight cellular concrete waste material to 1.0 mm or less is that the powder having a large particle size contains a correspondingly large number of air bubbles therein, and if this is used as a raw material for concrete, the concrete product becomes Since the strength of the powder decreases, the maximum particle size of the powder is set to 1.0 mm, and preferably to a fine particle having a maximum particle size of 0.8 mm or less as a range where the reduction in strength is practically acceptable.
【００１４】軽量気泡コンクリート廃材の粉末の混合量
がコンクリート原料中の固形分の１５重量％未満ではコ
ンクリート製品の比重が１．８５以下にならず、重量軽
減の効果が期待できない。３０重量％を超えるとコンク
リート製品の強度が低下するので、混合量はコンクリー
ト原料中の固形分の１５〜３０重量％の範囲内、さらに
好ましくは２０〜２５重量％の範囲内とする。If the mixing amount of the powder of the light-weight aerated concrete waste material is less than 15% by weight of the solid content in the concrete raw material, the specific gravity of the concrete product does not become 1.85 or less, and the effect of reducing the weight cannot be expected. If the content exceeds 30% by weight, the strength of the concrete product is reduced. Therefore, the mixing amount is in the range of 15 to 30% by weight, more preferably in the range of 20 to 25% by weight of the solid content in the raw material for concrete.
【００１５】軽量気泡コンクリートの廃材を粒径１．０
ｍｍ以下に粉砕した粉末をコンクリート原料中の固形分
の１５〜３０重量％の範囲内で混合させることにより、
得られるコンクリート製品は、常法により製造された普
通コンクリート製品と同程度の強度を維持したうえで、
比重が１．８程度以下の軽量コンクリート製品となる。[0015] The waste material of lightweight cellular concrete has a particle size of 1.0.
mm or less, by mixing the powder in a range of 15 to 30% by weight of the solid content in the concrete raw material,
The resulting concrete product, while maintaining the same strength as ordinary concrete products manufactured by ordinary methods,
It becomes a lightweight concrete product having a specific gravity of about 1.8 or less.
【００１６】[0016]
【発明の実施の形態】以下、実験例に基づいて本発明を
詳細に説明する。実験に供した軽量コンクリートは、次
のようにして製造した。 軽量気泡コンクリートの廃材を粉砕して粒径１．０ｍ
ｍ以下の粉末（ＡＬＣ粉末）とする。 骨材（細骨材）として砂を用いる。 セメント、砂、ＡＬＣ粉末を表１に示す割合で配合し
た発明品１〜４、比較品１、２のコンクリートパネル、
およびＡＬＣ粉末を用いない従来品のコンクリートパネ
ルを製造した。各コンクリートパネルの材令４週後の比
重と圧縮強度を表１に示す。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail based on experimental examples. The lightweight concrete used for the experiment was manufactured as follows. Pulverized waste of lightweight aerated concrete, particle size 1.0m
m or less (ALC powder). Sand is used as aggregate (fine aggregate). Concrete panels of invention products 1 to 4, comparative products 1 and 2 in which cement, sand and ALC powder were blended in the proportions shown in Table 1,
And the conventional concrete panel which does not use ALC powder was manufactured. Table 1 shows the specific gravity and compressive strength of each concrete panel after 4 weeks of age.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１に示すように、ＡＬＣ粉末を本発明の
混合割合の範囲内で混合した発明品１〜４のコンクリー
トパネルは、従来品のコンクリートパネルに比して４週
圧縮強度は同等以上で、比重は約２５％軽減された。Ａ
ＬＣ粉末の混合割合が本発明の範囲より多い比較品１、
２のコンクリートパネルは、比重の軽減効果はあるが、
４週圧縮強度が基準値の２１Ｎ／ｍｍ2 に達せず不適格
であった。As shown in Table 1, the concrete panels of inventions 1 to 4 in which ALC powder was mixed within the range of the mixing ratio of the present invention had a compressive strength equal to or higher than that of the conventional concrete panel for 4 weeks. The specific gravity was reduced by about 25%. A
Comparative product 1, in which the mixing ratio of the LC powder is larger than the range of the present invention,
The concrete panel 2 has the effect of reducing the specific gravity,
The 4-week compressive strength did not reach the standard value of 21 N / mm 2 and was unqualified.
【００１９】[0019]
【発明の効果】発泡剤を含まないコンクリート原料に、
軽量気泡コンクリートの廃材を粒径１．０ｍｍ以下に粉
砕した粉末をコンクリート原料中の固形分の１５〜３０
重量％の範囲内で混合させることにより、得られるコン
クリート製品は、常法により製造された普通コンクリー
ト製品と同等以上の強度を維持したうえで、重量が２５
％程度軽減したコンクリート製品となる。これにより普
通コンクリートの軽量化をはかることができるととも
に、軽量気泡コンクリートの廃材の再利用範囲を拡大す
ることができる。According to the present invention, a concrete raw material containing no foaming agent,
A powder obtained by pulverizing the waste material of lightweight cellular concrete to a particle size of 1.0 mm or less has a solid content of 15 to 30%.
By mixing within the range of weight%, the obtained concrete product maintains a strength equal to or higher than that of a normal concrete product manufactured by a conventional method, and has a weight of 25% or more.
It is a concrete product reduced by about%. As a result, the weight of ordinary concrete can be reduced, and the range of reusing waste materials of lightweight cellular concrete can be expanded.
Claims (1)
軽量気泡コンクリートの廃材を粒径１．０ｍｍ以下に粉
砕した粉末を前記コンクリート原料中の固形分の１５〜
３０重量％の範囲内で混合させてなる軽量コンクリー
ト。1. A concrete raw material containing no foaming agent,
A powder obtained by pulverizing waste material of lightweight cellular concrete to a particle diameter of 1.0 mm or less has a solid content of 15 to
Lightweight concrete mixed within the range of 30% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16020599A JP2000351680A (en) | 1999-06-07 | 1999-06-07 | Lightweight concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16020599A JP2000351680A (en) | 1999-06-07 | 1999-06-07 | Lightweight concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000351680A true JP2000351680A (en) | 2000-12-19 |
Family
ID=15710054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16020599A Pending JP2000351680A (en) | 1999-06-07 | 1999-06-07 | Lightweight concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000351680A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2832707A1 (en) * | 2001-11-23 | 2003-05-30 | Spb Sarl | Wall covering composition including hydraulic binders contains cellular concrete sand produced by grinding waste cellular concrete |
| JP2003212633A (en) * | 2002-01-24 | 2003-07-30 | Shigeyuki Kawada | Formed building board, its manufacturing method and its applying method |
-
1999
- 1999-06-07 JP JP16020599A patent/JP2000351680A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2832707A1 (en) * | 2001-11-23 | 2003-05-30 | Spb Sarl | Wall covering composition including hydraulic binders contains cellular concrete sand produced by grinding waste cellular concrete |
| JP2003212633A (en) * | 2002-01-24 | 2003-07-30 | Shigeyuki Kawada | Formed building board, its manufacturing method and its applying method |
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