JP3154786B2 - Method for producing artificial aggregate for concrete and artificial aggregate for concrete - Google Patents
Method for producing artificial aggregate for concrete and artificial aggregate for concreteInfo
- Publication number
- JP3154786B2 JP3154786B2 JP4405792A JP4405792A JP3154786B2 JP 3154786 B2 JP3154786 B2 JP 3154786B2 JP 4405792 A JP4405792 A JP 4405792A JP 4405792 A JP4405792 A JP 4405792A JP 3154786 B2 JP3154786 B2 JP 3154786B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- crushed
- cement
- artificial aggregate
- carbon dioxide
- 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.)
- Expired - Fee Related
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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
-
- 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
-
- 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)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はコンクリート用骨材の製
造方法とコンクリート用骨材にかかり、詳しくはコンク
リート構造物を解体したときに発生する廃棄コンクリー
トや生コンクリート工場等で発生するスラッジをコンク
リート用人工骨材にする方法と、これによって得られる
人工骨材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing aggregate for concrete and an aggregate for concrete, and more particularly to concrete for disposing concrete generated when a concrete structure is dismantled or sludge generated in a ready-mixed concrete factory. The present invention relates to a method for producing an artificial aggregate for use and an artificial aggregate obtained by the method.
【０００２】[0002]
【従来の技術】従来、コンクリート構造物の解体に際し
て発生する廃棄コンクリートや、生コンクリート工場、
コンクリート製品工場で発生するスラッジについては、
産業廃棄物などとして廃棄するのが普通であり、その有
効利用としては港湾などの埋め立て土や、道路舗装用骨
材としてその一部を用いる程度であった。2. Description of the Related Art Conventionally, waste concrete generated when demolishing concrete structures, ready-mixed concrete plants,
For sludge generated in concrete product factories,
It is common to dispose of it as industrial waste, and its effective use was to use part of it as landfill for harbors or as aggregate for road paving.
【０００３】[0003]
【発明が解決しようとする課題】ところで、近年廃棄コ
ンクリート中の骨材の表面に付着しているセメント分を
取り除き、該骨材をコンクリート用骨材として再利用す
る試みがなされてきているものの、骨材が取り除かれた
セメント水和物を高割合で含む微粉部分の有効な利用方
法は未だ提供されていないのが現状である。本発明は前
記事情に鑑みてなされたもので、その目的とするところ
は、コンクリート構造物を解体したときに発生する廃棄
コンクリートや生コンクリート工場等で発生するスラッ
ジの、より有効な利用を図り得る方法とその方法によっ
て得られるコンクリート用人工骨材を提供することにあ
る。In recent years, attempts have been made to remove cement adhering to the surface of aggregate in waste concrete and to reuse the aggregate as aggregate for concrete. At present, an effective method of using a fine powder portion containing a high proportion of cement hydrate from which aggregate has been removed has not yet been provided. The present invention has been made in view of the above circumstances, and an object thereof is to achieve more effective use of sludge generated in a waste concrete or ready-mixed concrete factory generated when a concrete structure is dismantled. It is an object of the present invention to provide a method and an artificial aggregate for concrete obtained by the method.
【０００４】[0004]
【課題を解決するための手段】本発明者らは前記課題を
解決するべく鋭意研究を重ねた結果、セメント硬化体中
のセメント水和物に多く存在する水酸化カルシウムは、
炭酸ガスと接触することで炭酸カルシウムに変化し、そ
の際約１２％の体積膨張をともなうことによってセメン
ト水和物中の細孔が充填され、細孔量が減少することに
よってセメント硬化体の強度が上がり、吸水率が低下す
るとの知見を得、本発明を完成した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies in order to solve the above-mentioned problems, and as a result, calcium hydroxide which is abundant in cement hydrate in a hardened cement is
It changes into calcium carbonate by contacting with carbon dioxide gas, with about 12% volume expansion filling the pores in the cement hydrate and reducing the amount of pores, resulting in the strength of the hardened cement. And found that the water absorption decreased, and completed the present invention.
【０００５】すなわち本発明における請求項１記載のコ
ンクリート用人工骨材の製造方法では、コンクリート構
造物を解体したときに発生する廃棄コンクリートまたは
生コンクリート工場やコンクリート製品工場で発生する
スラッジを破砕・ふるい分けしてセメント水和物を高割
合で含む微粉部分を取り出し、これに水、もしくは水と
セメントとを添加して加圧成形・硬化させて硬化体と
し、次いで該硬化体を粗砕して硬化体粗砕物とし、その
後該粗砕物を炭酸ガスと接触させて粗砕物中のセメント
水和物を炭酸化することを前記課題の解決手段とした。
請求項２記載のコンクリート用人工骨材の製造方法で
は、前記粗砕物を炭酸ガスと接触させるにあたり、接触
処理に際しての処理温度を３０℃以上９００℃以下と
し、炭酸ガスの濃度を５容量％以上にしたことを前記課
題の解決手段とした。請求項３記載のコンクリート用人
工骨材では、前記請求項１記載の製造方法によって得ら
れることを前記課題の解決手段とした。That is, in the method for producing an artificial aggregate for concrete according to claim 1 of the present invention, waste concrete generated when a concrete structure is dismantled or sludge generated at a ready-mixed concrete plant or a concrete product plant is crushed and sieved. And take out a fine powder portion containing a high proportion of cement hydrate, add water, or water and cement, press-mold and cure to obtain a cured product, and then crush the cured product to cure The object of the present invention is to form a body crushed product, and thereafter to contact the crushed product with carbon dioxide gas to carbonate the cement hydrate in the crushed product.
In the method for producing an artificial aggregate for concrete according to claim 2, when the coarsely crushed material is brought into contact with carbon dioxide, the treatment temperature at the time of the contact treatment is set to 30 ° C. or more and 900 ° C. or less, and the concentration of carbon dioxide is 5% by volume or more. This is the solution to the above problem. According to a third aspect of the present invention, there is provided an artificial aggregate for concrete obtained by the method of the first aspect.
【０００６】以下、本発明を請求項１記載の製造方法に
基づいて詳しく説明する。まず、コンクリート構造物を
解体したときに発生する廃棄コンクリートまたは生コン
クリート工場やコンクリート製品工場で発生するスラッ
ジを破砕・ふるい分けし、セメント水和物を高割合で含
む微粉部分を取り出す。Hereinafter, the present invention will be described in detail based on a manufacturing method according to claim 1. First, waste concrete generated when a concrete structure is dismantled or sludge generated in a ready-mixed concrete factory or a concrete product factory is crushed and sieved, and a fine powder portion containing a high proportion of cement hydrate is taken out.
【０００７】破砕処理についてはジョークラッシャーな
ど公知の破砕機によって行われ、またふるい分けについ
ては所望する人工骨材の用途についても異なるものの、
目開きが０.１５〜３.０ｍｍ程度のふるいによって行わ
れる。ここで、ふるいの目開きを０.１５〜３.０ｍｍ程
度としたのは、０.１５ｍｍ未満ではセメント水和物を
高割合で含む微粉部分の回収率が悪く、そのため破砕お
よびふるい分けの処理に長時間を要してしまうからであ
り、一方３.０ｍｍを越えると砂等のセメント水和物以
外の骨材成分が多く混入してしまうおそれがあるからで
ある。なお、このようにして取り出された微粉部分の中
のセメント硬化体中のセメント水和物には、多くの水酸
化カルシウムが存在しているのが確認されている。The crushing process is performed by a known crusher such as a jaw crusher, and the sieving process is different depending on the desired use of the artificial aggregate.
The opening is performed by a sieve having a mesh size of about 0.15 to 3.0 mm. Here, the reason why the sieve opening is set to about 0.15 to 3.0 mm is that when the sieve is less than 0.15 mm, the recovery rate of the fine powder portion containing a high proportion of cement hydrate is poor, so that it is used for crushing and sieving. This is because it takes a long time. On the other hand, if it exceeds 3.0 mm, a large amount of aggregate components other than cement hydrate such as sand may be mixed. In addition, it has been confirmed that a large amount of calcium hydroxide is present in the cement hydrate in the hardened cement in the fine powder portion thus taken out.
【０００８】次に、得られた微粉部分に水、もしくは水
とセメントとを添加してセメント分中の未水和セメント
を水和せしめ、さらにこれを加圧成形・硬化させて硬化
体とする。なお、この場合にセメントの添加の有無およ
びその量については、破砕・ふるい分けによって得られ
た微粉部分の成分や製造する骨材の用途によって適宜決
定される。次いで、得られた硬化体を粗砕して硬化体粗
砕物とする。粗砕処理については従来公知の粉砕機が用
いられる。また、粗砕処理によって得られる粗砕物の粒
径については、製造する骨材の用途、すなわち粗骨材と
するか細骨材とするか、さらにはそれぞれの骨材におい
てもどのような粒径のものが所望されるかによって適宜
決定される。Next, water or water and cement are added to the obtained fine powder portion to hydrate the unhydrated cement in the cement component, and this is pressed and hardened to obtain a hardened product. . In this case, the presence or absence of cement and the amount thereof are appropriately determined according to the components of the fine powder obtained by crushing and sieving and the use of the aggregate to be produced. Next, the obtained cured product is crushed to obtain a crushed cured product. For the crushing treatment, a conventionally known crusher is used. Regarding the particle size of the crushed material obtained by the crushing treatment, the purpose of the aggregate to be produced, that is, whether to use coarse aggregate or fine aggregate, Is appropriately determined depending on whether or not the above is desired.
【０００９】その後、得られた粗砕物を炭酸ガスと接触
させて粗砕物中のセメント水和物を炭酸化し、セメント
水和物中に存在する水酸化カルシウムを炭酸カルシウム
に変える。炭酸ガスと接触させる条件としては、温度は
特に限定されるものではないが、３０℃以上９００℃以
下とするのが好ましい。なぜなら、３０℃未満では水酸
化カルシウムが炭酸ガスと反応して炭酸カルシウムにな
る速度が遅くなり、処理に長時間を要してしまうからで
あり、また９００℃を越えると生成した炭酸カルシウム
が分解してしまうからである。Thereafter, the obtained crushed material is brought into contact with carbon dioxide gas to carbonate the cement hydrate in the crushed material, thereby converting calcium hydroxide present in the cement hydrate into calcium carbonate. As the conditions for contacting with carbon dioxide gas, the temperature is not particularly limited, but is preferably 30 ° C. or more and 900 ° C. or less. This is because if the temperature is lower than 30 ° C., the rate at which calcium hydroxide reacts with carbon dioxide to form calcium carbonate becomes slow, and the treatment takes a long time. If the temperature exceeds 900 ° C., the generated calcium carbonate is decomposed. Because they will.
【００１０】また、接触させる炭酸ガスについては、炭
酸ガス単独のものを用いてもよく、また空気や窒素など
と炭酸ガスとの混合ガスを用いてもよい。ここで、混合
ガスを用いる場合には、混合ガス中の炭酸ガス濃度につ
いて特に限定されるものではないが、後述するように粗
砕物中の水酸化カルシウムを炭酸カルシウムにする炭酸
化処理を速め、かつ粗砕物中の水酸化カルシウムの多く
炭酸化をするうえで５容量％以上とするのが好ましく、
高濃度である方がより好ましい。なお、前記混合ガスと
しては、炭酸ガスを含む燃焼排ガスなどを用いても特に
支障がない。As the carbon dioxide gas to be brought into contact, a carbon dioxide gas alone may be used, or a mixed gas of air, nitrogen or the like and a carbon dioxide gas may be used. Here, in the case of using a mixed gas, the carbon dioxide concentration in the mixed gas is not particularly limited, but a carbonation treatment for converting calcium hydroxide in the crushed material into calcium carbonate as described later is accelerated. In addition, it is preferable that the content be 5% by volume or more in order to carbonate a large amount of calcium hydroxide in the crushed material,
Higher concentrations are more preferred. It should be noted that there is no particular problem even if combustion exhaust gas containing carbon dioxide gas is used as the mixed gas.
【００１１】このような炭酸ガスとの接触処理によって
粗砕物は、そのセメント硬化体中のセメント水和物に多
く存在する水酸化カルシウムが炭酸カルシウムに変化
し、その際約１２％の体積膨張をともなうことによって
セメント水和物中の細孔が充填され、細孔量が減少する
ことによってセメント硬化体の強度が上がり、吸水率が
低下する。[0011] By such a contact treatment with carbon dioxide gas, the crushed material changes calcium hydroxide, which is abundant in the cement hydrate in the hardened cement, into calcium carbonate, and at this time, expands the volume by about 12%. As a result, the pores in the cement hydrate are filled, and the reduced amount of the pores increases the strength of the cured cement body and lowers the water absorption.
【００１２】[0012]
【作用】請求項１記載のコンクリート用人工骨材の製造
方法によれば、廃棄コンクリートやスラッジを破砕・ふ
るい分けして得られる微粉部分に水、もしくは水とセメ
ントとを添加することにより、微粉部分中の未水和セメ
ントがセメント水和物となる。そして、得られた硬化体
粗砕物を炭酸ガスと接触させ、粗砕物中のセメント水和
物を炭酸化することにより、セメント水和物に多く存在
する水酸化カルシウムが約１２％の体積膨張をともなっ
て炭酸カルシウムに変化し、これによりセメント水和物
中の細孔が充填され、細孔量が減少することによって得
られるセメント硬化体の強度が上がり、吸水率が低下す
る。According to the method for producing an artificial aggregate for concrete according to the first aspect, water or water and cement are added to the fine powder obtained by crushing and sieving waste concrete or sludge, whereby the fine powder The unhydrated cement in it becomes a cement hydrate. Then, the obtained hardened material crushed material is brought into contact with carbon dioxide gas, and the cement hydrate in the crushed material is carbonated, so that calcium hydroxide, which is largely present in the cement hydrate, undergoes a volume expansion of about 12%. At the same time, it changes to calcium carbonate, which fills the pores in the cement hydrate and reduces the amount of pores, thereby increasing the strength of the obtained cement hardened body and decreasing the water absorption.
【００１３】請求項２記載のコンクリート用人工骨材の
製造方法によれば、粗砕物を炭酸ガスと接触させるにあ
たり、接触処理に際しての処理温度を３０℃以上９００
℃以下とし、炭酸ガスの濃度を５容量％以上としたの
で、粗砕物中の水酸化カルシウムを炭酸カルシウムにす
る炭酸化処理が十分な速さとなり、かつ粗砕物中の水酸
化カルシウムの十分な量が炭酸カルシウムとなる。請求
項３記載のコンクリート用人工骨材は、請求項１記載の
製造方法によって得られたものであるので、十分な強度
を有しかつ低吸水率のものとなる。According to the method for producing an artificial aggregate for concrete according to the second aspect, when the crushed material is brought into contact with carbon dioxide, the treatment temperature at the time of the contact treatment is 30 ° C. or more and 900 ° C.
° C or less and the concentration of carbon dioxide gas was set to 5% by volume or more, so that the carbonation treatment for converting calcium hydroxide in the crushed material into calcium carbonate was sufficiently fast, and the calcium hydroxide in the crushed material was sufficiently reduced. The amount becomes calcium carbonate. The artificial aggregate for concrete according to the third aspect is obtained by the production method according to the first aspect, and thus has sufficient strength and low water absorption.
【００１４】[0014]
【実施例】以下、本発明を実施例によりさらに詳しく説
明する。廃棄コンクリートをジョークラッシャーで粗砕
し、得られた粗砕物を目開きが０.３ｍｍのふるいでふ
るい分けて廃棄コンクリート中の骨材を取り除き、粒径
が０.３ｍｍ以下の微粉部分を得た。次に、得られた微
粉部分７０重量部に対し、３０重量部の普通ポルトラン
ドセメントと１５重量部の水とを加えて十分に混練し、
さらにこの混練物を１００ｋｇｆ／ｃｍ2の成形圧力で
板状に加圧成形し、２０℃，８０％ＲＨ以上の恒温恒湿
室で７２時間養生した。The present invention will be described in more detail with reference to the following examples. The waste concrete was crushed with a jaw crusher, and the obtained crushed material was sieved with a sieve having an opening of 0.3 mm to remove aggregates in the waste concrete, and a fine powder having a particle size of 0.3 mm or less was obtained. Next, 30 parts by weight of ordinary Portland cement and 15 parts by weight of water were added to 70 parts by weight of the obtained fine powder, and kneaded sufficiently.
Further, the kneaded material was pressed into a plate at a molding pressure of 100 kgf / cm 2 and cured for 72 hours in a constant temperature and humidity chamber at 20 ° C. and 80% RH or higher.
【００１５】養生後、得られた硬化体をジョークラッシ
ャーで粗砕し、目開きが２.５ｍｍのふるいと５ｍｍの
ふるいとでふるい分けし、粒径が２.５ｍｍから５ｍｍ
の範囲の硬化体粗砕物を得た。その後、得られた粗砕物
を温度６０℃，湿度６０％ＲＨ，炭酸ガス濃度が３０容
量％の混合ガス槽中に２４時間放置し、粗砕物を炭酸ガ
スと接触せしめて人工骨材を製造した。なお、混合ガス
槽中にて使用した混合ガスは空気と炭酸ガスとの混合ガ
スであり、炭酸ガスを３０容量％としたものである。After curing, the obtained cured product is coarsely crushed with a jaw crusher, sieved with a sieve having a mesh size of 2.5 mm and a sieve with a mesh size of 5 mm, and having a particle size of 2.5 mm to 5 mm.
Of the cured product was obtained. Thereafter, the obtained crushed material was left in a mixed gas tank having a temperature of 60 ° C., a humidity of 60% RH, and a carbon dioxide gas concentration of 30% by volume for 24 hours, and the crushed material was brought into contact with carbon dioxide to produce an artificial aggregate. . The mixed gas used in the mixed gas tank was a mixed gas of air and carbon dioxide gas, and the carbon dioxide gas was 30% by volume.
【００１６】このようにして得られた人工骨材と、前記
方法において得られた炭酸ガス処理前の人工骨材と、粒
径が２.５〜５ｍｍの範囲の通常コンクリートに用いら
れる細骨材（川砂）と、軽量コンクリート用人工軽量骨
材とについてそれぞれ吸水率、絶乾比重を測定し、その
結果を表１に示す。The artificial aggregate thus obtained, the artificial aggregate obtained before the carbon dioxide treatment obtained by the above method, and the fine aggregate used for ordinary concrete having a particle size of 2.5 to 5 mm. (Water sand) and artificial lightweight aggregate for lightweight concrete were measured for water absorption and absolute specific gravity, respectively, and the results are shown in Table 1.
【００１７】[0017]
【表１】 表１に示した結果より、本発明品である炭酸ガス処理後
の人工骨材は、軽量コンクリート用人工軽量骨材、炭酸
ガス処理前の人工骨材に比べ吸水率が低く、また絶乾比
重については軽量コンクリート用人工軽量骨材、炭酸ガ
ス処理前の人工骨材に比べ大きいことが確認された。[Table 1] From the results shown in Table 1, the artificial aggregate after the carbon dioxide treatment, which is the product of the present invention, has a lower water absorption than the artificial lightweight aggregate for lightweight concrete and the artificial aggregate before the carbon dioxide treatment, and also has an absolute dry specific gravity. It was confirmed that the value was larger than the artificial lightweight aggregate for lightweight concrete and the artificial aggregate before carbon dioxide treatment.
【００１８】（実験例）実施例１で用いた４種の骨材を
用い、水／セメント比＝０.５０、骨材／セメント比＝
２.０でＪＩＳに準じてそれぞれモルタルを作製し、材
令２８日のモルタル強さをそれぞれ測定した。得られた
結果を表２に示す。(Experimental Example) Using the four types of aggregates used in Example 1, the ratio of water / cement = 0.50, the ratio of aggregate / cement =
Each mortar was prepared according to JIS at 2.0, and the mortar strength on the age of 28 days was measured. Table 2 shows the obtained results.
【００１９】[0019]
【表２】 表２に示した結果より、本発明品を用いたモルタルは、
炭酸ガス処理前の人工骨材を用いたモルタル、軽量コン
クリート用人工軽量骨材を用いたモルタルに比べモルタ
ル強さに優れていることが確認された。[Table 2] From the results shown in Table 2, the mortar using the product of the present invention was:
It was confirmed that the mortar using the artificial aggregate before carbon dioxide treatment and the mortar using the artificial lightweight aggregate for lightweight concrete had superior mortar strength.
【００２０】[0020]
【発明の効果】以上説明したように本発明における請求
項１記載のコンクリート用人工骨材の製造方法は、廃棄
コンクリートやスラッジを破砕・ふるい分けして得られ
るセメント水和物を高割合で含む微粉部分に水、もしく
は水とセメントとを添加して得られた硬化体粗砕物を炭
酸ガスと接触させ、粗砕物中のセメント水和物を炭酸化
するものであるから、セメント水和物に多く存在する水
酸化カルシウムを約１２％の体積膨張をともなって炭酸
カルシウムに変化させ、これによりセメント水和物中の
細孔を充填し、細孔量を減少せしめることによって得ら
れるセメント硬化体の強度を上げ、吸水率を低下させる
ことができる。したがってこの製造方法を用いれば、コ
ンクリート構造物を解体したときに発生する廃棄コンク
リートや生コンクリート工場等で発生するスラッジを、
従来のごとく廃棄することなく、コンクリート用人工骨
材として有効利用することができる。As described above, the method for producing an artificial aggregate for concrete according to claim 1 of the present invention provides a fine powder containing a high proportion of cement hydrate obtained by crushing and sieving waste concrete or sludge. The hardened material obtained by adding water or water and cement to the part is brought into contact with carbon dioxide gas to carbonate the cement hydrate in the roughened material. The strength of the cured cement body obtained by changing the existing calcium hydroxide to calcium carbonate with about 12% volume expansion, thereby filling the pores in the cement hydrate and reducing the amount of the pores. To increase the water absorption. Therefore, if this manufacturing method is used, waste concrete generated when the concrete structure is dismantled, sludge generated in the ready-mixed concrete factory, etc.
It can be effectively used as an artificial aggregate for concrete without being discarded as in the prior art.
【００２１】請求項２記載のコンクリート用人工骨材の
製造方法は、粗砕物を炭酸ガスと接触させるにあたり、
接触処理に際しての処理温度を３０℃以上９００℃以下
とし、炭酸ガスの濃度を５容量％以上としたものである
から、粗砕物中の水酸化カルシウムを炭酸カルシウムに
する炭酸化処理を十分な速さで行え、かつ粗砕物中の水
酸化カルシウムの十分量を炭酸カルシウムにすることが
できる。請求項３記載のコンクリート用人工骨材は、請
求項１記載の製造方法によって得られたものであるので
十分な強度を有しかつ低吸水率のものとなり、したがっ
て有効な人工骨材となる。In the method for producing an artificial aggregate for concrete according to claim 2, when the coarsely crushed material is brought into contact with carbon dioxide gas,
Since the treatment temperature at the time of the contact treatment is 30 ° C. or more and 900 ° C. or less and the concentration of carbon dioxide gas is 5% by volume or more, the carbonation treatment for converting calcium hydroxide in the crushed material into calcium carbonate is performed at a sufficiently high speed. As a result, a sufficient amount of calcium hydroxide in the crushed material can be converted into calcium carbonate. The artificial aggregate for concrete according to the third aspect has a sufficient strength and a low water absorption since it is obtained by the production method according to the first aspect, and thus is an effective artificial aggregate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横田 紀男 千葉県船橋市豊富町585番地 住友セメ ント株式会社中央研究所内 (72)発明者 内田 清彦 千葉県船橋市豊富町585番地 住友セメ ント株式会社中央研究所内 (56)参考文献 特開 昭61−155234（ＪＰ，Ａ) 特開 平３−54137（ＪＰ，Ａ) 特開 平１−224283（ＪＰ，Ａ) 特開 平４−21550（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 14/00 - 28/36 B09B 3/00 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio Yokota 585 Tomicho, Funabashi-shi, Chiba Sumitomo Cement Co., Ltd. (72) Inventor Kiyohiko Uchida 585 Tomicho, Funabashi-shi, Chiba Sumitomo Cement (56) References JP-A-61-155234 (JP, A) JP-A-3-54137 (JP, A) JP-A-1-224283 (JP, A) JP-A-4-21550 (JP, A A) (58) Fields investigated (Int. Cl. 7 , DB name) C04B 14/00-28/36 B09B 3/00
Claims (3)
生する廃棄コンクリートまたは生コンクリート工場やコ
ンクリート製品工場で発生するスラッジを破砕・ふるい
分けしてセメント水和物を高割合で含む微粉部分を取り
出し、これに水、もしくは水とセメントとを添加して加
圧成形・硬化させて硬化体とし、次いで該硬化体を粗砕
して硬化体粗砕物とし、その後該粗砕物を炭酸ガスと接
触させて粗砕物中のセメント水和物を炭酸化することを
特徴とするコンクリート用人工骨材の製造方法。1. A method for crushing and sieving waste concrete generated when a concrete structure is dismantled or sludge generated at a ready-mixed concrete plant or a concrete product plant to take out a fine powder portion containing a high proportion of cement hydrate. Water or water and cement are added to the mixture, and the mixture is pressed and cured to form a cured product, and then the cured product is crushed into a crushed cured product, and the crushed product is then contacted with carbon dioxide gas to form a crushed product. A method for producing an artificial aggregate for concrete, comprising carbonating cement hydrate in crushed material.
の製造方法において、粗砕物を炭酸ガスと接触させるに
あたり、接触処理に際しての処理温度を３０℃以上９０
０℃以下とし、炭酸ガスの濃度を５容量％以上にしたこ
とを特徴とするコンクリート用人工骨材の製造方法。2. The method for producing an artificial aggregate for concrete according to claim 1, wherein, when the coarsely crushed material is brought into contact with carbon dioxide, the treatment temperature at the time of the contact treatment is 30 ° C. or more and 90 ° C. or more.
A method for producing an artificial aggregate for concrete, wherein the temperature is set to 0 ° C. or lower and the concentration of carbon dioxide gas is set to 5% by volume or more.
生する廃棄コンクリートまたは生コンクリート工場やコ
ンクリート製品工場で発生するスラッジが破砕・ふるい
分けされてセメント水和物を高割合で含む微粉部分が取
り出され、この微粉部分に水、もしくは水とセメントと
が添加されさらに加圧成形・硬化せしめられて硬化体と
され、該硬化体が粗砕されて硬化体粗砕物とされ、該粗
砕物が炭酸ガスと接触せしめられて粗砕物中のセメント
水和物が炭酸化されて得られることを特徴とするコンク
リート用人工骨材。3. Waste concrete generated when a concrete structure is dismantled or sludge generated in a ready-mixed concrete plant or a concrete product plant is crushed and sieved to remove a fine powder portion containing a high proportion of cement hydrate, Water or water and cement are added to the fine powder portion, and the mixture is further press-molded and cured to form a cured product, and the cured product is crushed into a crushed cured product. An artificial aggregate for concrete, wherein the cement hydrate in the crushed material is brought into contact with and carbonated to obtain the cement hydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4405792A JP3154786B2 (en) | 1992-02-28 | 1992-02-28 | Method for producing artificial aggregate for concrete and artificial aggregate for concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4405792A JP3154786B2 (en) | 1992-02-28 | 1992-02-28 | Method for producing artificial aggregate for concrete and artificial aggregate for concrete |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05238791A JPH05238791A (en) | 1993-09-17 |
| JP3154786B2 true JP3154786B2 (en) | 2001-04-09 |
Family
ID=12680989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4405792A Expired - Fee Related JP3154786B2 (en) | 1992-02-28 | 1992-02-28 | Method for producing artificial aggregate for concrete and artificial aggregate for concrete |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3154786B2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0768164A (en) * | 1993-09-03 | 1995-03-14 | Kyoei Kogyo Kk | Carbon dioxide fixing material and carbon dioxide fixing filter |
| JP2000157094A (en) * | 1998-11-27 | 2000-06-13 | Nkk Corp | Stone material for sinking and disposing in water and its production |
| KR20010007809A (en) * | 2000-09-27 | 2001-02-05 | 김영호 | Concrete composition using the waste concrete and the method for the preparation of concrete structure using the save |
| JP4688077B2 (en) * | 2005-01-27 | 2011-05-25 | 木村管工株式会社 | Sandy granulated material and method for producing the same |
| JP6425111B2 (en) * | 2014-03-27 | 2018-11-21 | 学校法人 芝浦工業大学 | A method for determining whether or not recycled aggregate is expected to have a quality improvement effect by adsorbing carbon dioxide |
| WO2020046927A1 (en) * | 2018-08-27 | 2020-03-05 | Solidia Technologies, Inc. | Multi-step curing of green bodies |
| CN110790541A (en) * | 2019-03-28 | 2020-02-14 | 湖南大学 | Method for preparing artificial aggregate by utilizing recycled micro powder |
| CN117500766A (en) * | 2021-06-18 | 2024-02-02 | 杰富意钢铁株式会社 | Carbonation method of CaO-containing materials method for producing carbonated material |
| CN116283010B (en) * | 2023-04-06 | 2023-11-03 | 杨国卿 | Carbonization process of solid waste recycled concrete aggregate for concrete |
-
1992
- 1992-02-28 JP JP4405792A patent/JP3154786B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05238791A (en) | 1993-09-17 |
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