JPH0692700A - Production of light-weight aggregate - Google Patents
Production of light-weight aggregateInfo
- Publication number
- JPH0692700A JPH0692700A JP18844892A JP18844892A JPH0692700A JP H0692700 A JPH0692700 A JP H0692700A JP 18844892 A JP18844892 A JP 18844892A JP 18844892 A JP18844892 A JP 18844892A JP H0692700 A JPH0692700 A JP H0692700A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- light
- aggregate
- cement paste
- lightweight aggregate
- 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.)
- Granted
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
- C04B18/027—Lightweight 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
- 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)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主にコンクリート用の
骨材として用いられる軽量骨材の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a lightweight aggregate mainly used as an aggregate for concrete.
【０００２】[0002]
【従来の技術】軽石等の火山礫は、一般の骨材に比較し
て非常に吸水率が大きく強度自体も低いため、コンクリ
ート用骨材としては水／セメント比に大きく影響を与え
たり、コンクリート体の強度に影響を与えることなどか
らその使用に難がある。また、コンクリート用軽量骨材
として製造されている人工軽量骨材も、火山礫と同様一
般に吸水率が高く、使用に際してはこれにプレウェッテ
ィング処理を施したり、コンクリート配合の際単位水量
を増やすといった処理を行わなければならず、さらに得
られる硬化コンクリートの強度も低くなるといった欠点
がある。2. Description of the Related Art Since gravel such as pumice stone has a very high water absorption rate and a low strength as compared with general aggregates, it greatly affects the water / cement ratio as an aggregate for concrete, It is difficult to use because it affects the strength of the body. In addition, artificial lightweight aggregates manufactured as lightweight aggregates for concrete also generally have a high water absorption rate like volcanic pebbles, and when they are used, they are subjected to pre-wetting treatment or the unit water amount is increased when mixing concrete. There is a drawback in that treatment must be carried out, and the strength of the obtained hardened concrete also becomes low.
【０００３】そこで、火山礫についてはその表面をセメ
ントで被膜し、火山礫の吸水率を下げ、かつこれを配合
して得られるコンクリート硬化体の強度も高めようとの
試みがなされている。しかし、単に火山礫の表面をセメ
ントで被覆しただけでは、火山礫の吸水率を大幅に下げ
ることはできず、また火山礫を使用したコンクリートの
強度改善も十分には達成できていないのである。Therefore, it has been attempted to coat the surface of volcanic gravel with cement to reduce the water absorption rate of the gravel and to increase the strength of a hardened concrete obtained by mixing the same. However, simply coating the surface of the gravel with cement cannot significantly reduce the water absorption rate of the gravel, and the strength of concrete using the gravel cannot be sufficiently improved.
【０００４】[0004]
【発明が解決しようとする課題】ところで、セメント硬
化体の強度を高める方法として、硬化後のセメントを炭
酸ガス雰囲気に晒すといった方法が知られている。すな
わち、この方法によればセメントの水和により析出した
Ｃａ（ＯＨ）2 を炭酸ガスと接触させることによってＣ
ａＣＯ3 に変化させ、これによりセメント硬化体の細孔
を埋めてその強度を高めることができるのである。そし
て、このような技術を前述した火山礫や人工軽量骨材の
特性向上に利用したいとの期待がある。By the way, as a method of increasing the strength of a hardened cement product, a method of exposing the hardened cement to a carbon dioxide gas atmosphere is known. That is, according to this method, Ca (OH) 2 precipitated by hydration of cement is contacted with carbon dioxide gas to form C
By changing to aCO 3 , it is possible to fill the pores of the hardened cement body and increase its strength. It is hoped that such a technique will be used to improve the characteristics of the above-mentioned gravels and artificial lightweight aggregates.
【０００５】しかしながら、前記方法ではセメント硬化
体の内部まで炭酸化するのは困難であり、内部まで炭酸
化するには長時間を要してしまうといった問題がある。
そこで、炭酸化を迅速に進行させるため、例えば加圧し
た炭酸ガス中に硬化体を晒したり、高周波加熱によりセ
メント硬化体を加熱してその含水率を調整・均一化する
といった方法も考えられるが、このような方法では設備
が大型化したり、特殊な装置を必要とするため実用に供
すまでには至っていないのが現状である。However, according to the above method, it is difficult to carbonate the inside of the hardened cement, and it takes a long time to carbonate the inside.
Therefore, in order to rapidly promote carbonation, for example, a method of exposing the hardened body to pressurized carbon dioxide gas or heating the hardened cement body by high-frequency heating to adjust / uniformize the water content thereof can be considered. However, in such a method, the size of the equipment is increased and a special device is required, so that the method is not yet put into practical use.
【０００６】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、火山礫等の天然軽量骨材
や人工軽量骨材の表面に炭酸化セメント硬化層を不都合
なく形成することのできる方法を提供し、これによって
軽量骨材の吸水率を下げ、さらに該軽量骨材を配合して
得られるコンクリートの強度を高めることにある。The present invention has been made in view of the above circumstances, and an object thereof is to form a carbonized cement hardened layer on the surface of natural lightweight aggregate such as volcanic gravel or artificial lightweight aggregate without inconvenience. Another object of the present invention is to reduce the water absorption rate of the lightweight aggregate and further increase the strength of the concrete obtained by mixing the lightweight aggregate.
【０００７】[0007]
【課題を解決するための手段】セメントは水と接触する
とカルシウム等のイオンが水に溶出し、水中のイオン濃
度が飽和したところでＣａ（ＯＨ）2 を析出し硬化して
いく。このとき、イオンの溶けている水溶液に炭酸ガス
が接触すると、カルシウムイオンがＣａＣＯ3に変化し
て水溶液中のイオン濃度が下がるため、セメント粒子か
らのイオンの溶出が促進され、結果としてセメントの水
和およびこれに伴う硬化が促進されるのである。このよ
うな機構においては、炭酸ガスによるセメントの水和お
よび硬化の促進の面からはセメントへの注水直後に炭酸
ガスを接触させることが好ましいものの、あまり水硬反
応の初期から炭酸ガスと接触させるとセメントが十分硬
化していないため、前述した細孔量の減少という作用が
発揮されないことになる。Means for Solving the Problems When the cement comes into contact with water, ions such as calcium are eluted into the water, and Ca (OH) 2 is precipitated and hardens when the ion concentration in the water is saturated. At this time, when carbon dioxide comes into contact with the aqueous solution in which the ions are dissolved, calcium ions are changed to CaCO 3 and the ion concentration in the aqueous solution is lowered, so that the elution of the ions from the cement particles is promoted and, as a result, the water content of the cement is increased. The sum and the curing associated therewith are accelerated. In such a mechanism, it is preferable to contact carbon dioxide immediately after water injection into the cement from the viewpoint of accelerating hydration and hardening of cement by carbon dioxide, but too much contact with carbon dioxide from the initial stage of hydraulic reaction. Since the cement is not sufficiently hardened, the effect of reducing the amount of pores described above cannot be exhibited.
【０００８】本発明者は、このような機構を分析しその
結果に基づいて鋭意研究を重ねた結果、従来技術に述べ
た理由により従来コンクリート用骨材としてあまり使用
されていなかった火山礫等の天然軽量骨材や人工軽量骨
材の表面をセメントペーストで被膜し、これを所定時間
養生した後、さらに炭酸ガス雰囲気中にて養生しセメン
トペースト被膜を炭酸ガスに接触させることに着目し
た。そして、被膜を構成するセメントの水和および硬化
が促進される作用、および被膜中に生成するＣａＣＯ3
が細孔を埋める作用をともに考慮し、最も吸水率が小さ
く、また得られるコンクリート硬化体の強度を高めるこ
とのできる軽量骨材の製造条件を見いだし本発明を完成
させたのである。The present inventor has analyzed such a mechanism and conducted intensive research based on the results. As a result, for the reasons described in the prior art, volcanic gravel and the like, which have not been used so far as aggregates for concrete, have been developed. We focused on coating the surface of natural lightweight aggregate or artificial lightweight aggregate with cement paste, curing it for a predetermined time, and then curing it in a carbon dioxide atmosphere to bring the cement paste coating into contact with carbon dioxide. Then, the action of promoting the hydration and hardening of the cement constituting the coating, and CaCO 3 generated in the coating
In consideration of the effect of filling the pores together, the inventors have found the manufacturing conditions of a lightweight aggregate that has the smallest water absorption rate and that can increase the strength of the hardened concrete obtained, and completed the present invention.
【０００９】すなわち、本発明における請求項１記載の
軽量骨材の製造方法では、火山礫等の天然軽量骨材また
は人工軽量骨材の表面にセメントペーストを付着せしめ
てセメントペースト被膜を形成し、その後該被膜形成軽
量骨材を炭酸ガス雰囲気中で養生することを前記課題の
解決手段とした。請求項２記載の軽量骨材の製造方法で
は、火山礫等の天然軽量骨材または人工軽量骨材の表面
にセメントペーストを付着せしめてセメントペースト被
膜を形成し、次いで０〜８０℃で養生を行い、またこれ
と同時に前記セメントペーストと同じ水／セメント比、
同じ養生条件でセメントペーストを成形養生し、この養
生セメントペーストの圧縮強度が０.１ｋｇｆ／ｃｍ2
〜６００ｋｇｆ／ｃｍ2 に達した以後に、前記セメント
ペースト被膜形成軽量骨材を３０〜９００℃の炭酸ガス
雰囲気中で養生することを前記課題の解決手段とした。That is, in the method for producing a lightweight aggregate according to claim 1 of the present invention, cement paste is adhered to the surface of natural lightweight aggregate such as volcanic gravel or artificial lightweight aggregate to form a cement paste coating, Then, curing the film-forming lightweight aggregate in a carbon dioxide atmosphere was taken as a means for solving the above problems. In the method for manufacturing a lightweight aggregate according to claim 2, cement paste is adhered to the surface of a natural lightweight aggregate such as volcanic gravel or an artificial lightweight aggregate to form a cement paste coating, and then curing at 0 to 80 ° C. And at the same time same water / cement ratio as the cement paste,
Cement paste is molded and cured under the same curing conditions, and the compressive strength of this curing cement paste is 0.1 kgf / cm 2
After reaching to 600 kgf / cm 2 , curing the cement paste film-forming lightweight aggregate in a carbon dioxide atmosphere at 30 to 900 ° C. was a means for solving the above problems.
【００１０】以下、本発明を詳しく説明する。本発明に
おいては、火山礫等の天然軽量骨材や人工軽量骨材の種
類については特に限定されることなく、従来公知のもの
が使用可能である。また、これらに付着させ被膜させる
ために用いるセメントについても、その種類については
特に限定されることなく、市販品の各種セメント、例え
ばポルトランドセメントや、公知の特殊セメントが使用
できる。また、これらセメントをペースト化するうえで
の水／セメント比についても特に限定されることなく、
従来一般に採用される範囲に設定される。The present invention will be described in detail below. In the present invention, the types of natural lightweight aggregates such as lapilli and artificial lightweight aggregates are not particularly limited, and conventionally known ones can be used. The type of cement used for adhering and coating these is not particularly limited, and various commercially available cements such as Portland cement and known special cements can be used. Also, the water / cement ratio for making these cements into paste is not particularly limited,
It is set within a range that is conventionally generally adopted.
【００１１】軽量骨材にセメントペーストを付着せしめ
て骨材表面にセメントペースト被膜を形成する方法とし
ては、例えば軽量骨材とセメントとを混合した後、造粒
機等の中で回転させながら軽量骨材およびセメントに水
を吹き付け、これによってセメントペーストを作製しつ
つこれを軽量骨材表面に付着させ被膜させるといった方
法が採用される。このように軽量骨材表面にセメントペ
ースト被膜を形成した後の、該ペースト被膜の養生・硬
化については、０〜８０℃で行う。A method of adhering the cement paste to the lightweight aggregate to form a cement paste coating on the surface of the aggregate is, for example, mixing the lightweight aggregate and the cement and then rotating them in a granulator or the like to reduce the weight. A method is used in which water is sprayed on the aggregate and the cement, whereby a cement paste is produced and is adhered to the surface of the lightweight aggregate to form a film. After the cement paste coating is formed on the surface of the lightweight aggregate as described above, the paste coating is cured and cured at 0 to 80 ° C.
【００１２】またこのとき、ペースト被膜形成と同時
に、該セメントペーストと同一配合のものを同じ水／セ
メント比、同じ養生条件で成形する。そして、この成形
物の圧縮強度が０.１ｋｇｆ／ｃｍ2 〜６００ｋｇｆ／
ｃｍ2 に達したとき、すなわちこのとき以後に、前記セ
メントペースト被膜形成軽量骨材を３０〜９００℃の炭
酸ガス雰囲気中で１〜２４時間養生する。At this time, simultaneously with the formation of the paste film, the cement paste having the same composition is molded under the same water / cement ratio and the same curing condition. The compression strength of this molded product is 0.1 kgf / cm 2 to 600 kgf /
When it reaches cm 2 , that is, after this time, the cement paste film-forming lightweight aggregate is aged in a carbon dioxide gas atmosphere at 30 to 900 ° C. for 1 to 24 hours.
【００１３】ここで、セメントペースト被膜と同一配
合、同一水／セメント比、同じ養生条件のものを成形す
るのは、これの硬化度を調べて骨材表面のペースト被膜
の硬化度を推定するためであり、また硬化度としては圧
縮強度の値によってほぼこれに代用することができる。
また、硬化度の代用となる圧縮強度が０.１ｋｇｆ／ｃ
ｍ2 〜６００ｋｇｆ／ｃｍ2 に達したとき以後、すなわ
ち骨材表面のペースト被膜の圧縮強度が前記範囲に達し
たと見なされた際、該骨材を炭酸ガスと接触させるの
は、圧縮強度が０.１ｋｇｆ／ｃｍ2 未満ではセメント
ペーストが十分硬化していないため得られる硬化体の細
孔が十分少なくならず、よって最終的に得られる骨材の
強度が十分向上しないからであり、また６００ｋｇｆ／
ｃｍ2 を越えると、セメント硬化体が緻密化しすぎて炭
酸ガスの硬化体内部への浸透が十分になされず、結果と
して骨材表面のセメントペーストの細孔低減、炭酸化に
よる強度向上が達成できないからである。Here, the reason why the cement paste coating has the same composition, the same water / cement ratio, and the same curing condition is to inspect the curing degree of the cement paste coating to estimate the curing degree of the paste coating on the aggregate surface. Further, as the degree of curing, the value of the compressive strength can be almost substituted for this.
Also, the compressive strength, which is a substitute for the degree of curing, is 0.1 kgf / c.
After reaching m 2 to 600 kgf / cm 2 , that is, when it is considered that the compressive strength of the paste coating on the surface of the aggregate has reached the above range, it is necessary to contact the aggregate with carbon dioxide gas. This is because if it is less than 0.1 kgf / cm 2 , the cement paste is not sufficiently hardened so that the number of pores of the hardened body obtained cannot be sufficiently reduced, and thus the strength of the finally obtained aggregate cannot be sufficiently improved. /
If it exceeds cm 2 , the hardened cement will be too dense, and the penetration of carbon dioxide into the hardened body will not be sufficient, and as a result, it will not be possible to reduce the pores of the cement paste on the aggregate surface and improve the strength by carbonation. Because.
【００１４】養生に際しての炭酸ガスについては、通常
は空気に混合され混合ガスとして用いられる。また、炭
酸ガスの濃度については、低濃度でもよいものの、３％
以上とするのが、養生時間を比較的短縮することができ
好ましい。炭酸ガスを含む混合ガスの温度、すなわち養
生温度については特に限定されないが、３０〜９００℃
の範囲とするのが好ましい。なぜなら、３０℃未満では
炭酸ガスの硬化体中への拡散速度が遅くなって中性化に
要する時間が長くなってしまうからであり、９００℃を
越えるとセメントの硬化が速く進みすぎ、内部まで十分
に中性化されないからである。Regarding carbon dioxide during curing, it is usually mixed with air and used as a mixed gas. Regarding the concentration of carbon dioxide gas, although it may be low, 3%
The above is preferable because the curing time can be relatively shortened. The temperature of the mixed gas containing carbon dioxide, that is, the curing temperature is not particularly limited, but is 30 to 900 ° C.
The range is preferably This is because if the temperature is lower than 30 ° C, the diffusion speed of carbon dioxide into the hardened body becomes slow and the time required for neutralization becomes long. This is because it is not sufficiently neutralized.
【００１５】なお、養生に際しての環境ガスとしては、
炭酸ガスを含んでいればこれ以外の成分を含んでいるも
のでもよく、例えば燃焼廃ガスでも温度だけを調整して
使用することができる。また、炭酸ガスは濃度の低いも
ので良く、好ましくは３％以上である。炭酸ガス温度は
特に限定されないが、３０〜９００℃の範囲が好まし
い。炭酸ガス以外の成分を含んでいる燃焼廃ガス等も温
度だけを調整して使用する事が出来る。As an environmental gas for curing,
As long as it contains carbon dioxide gas, it may contain other components. For example, combustion waste gas can be used by adjusting only the temperature. The carbon dioxide gas may have a low concentration, and is preferably 3% or more. The carbon dioxide gas temperature is not particularly limited, but is preferably in the range of 30 to 900 ° C. Combustion waste gas containing components other than carbon dioxide can also be used by adjusting the temperature only.
【００１６】[0016]
【作用】本発明の軽量骨材の製造方法によれば、軽量骨
材表面上のセメントペースト被膜に炭酸ガスを接触させ
ることにより、セメントペーストの水和が促進されてセ
メント硬化体に形成される細孔が埋まり、しかも炭酸化
により水和が促進され、よって細孔がきわめて少なく強
度の高いセメント被膜を軽量骨材上に形成することがで
きる。According to the method for producing a lightweight aggregate of the present invention, the cement paste coating on the surface of the lightweight aggregate is brought into contact with carbon dioxide to accelerate the hydration of the cement paste to form a hardened cement body. The pores are filled, and hydration is promoted by carbonation, so that a cement coating having very few pores and high strength can be formed on the lightweight aggregate.
【００１７】[0017]
【実施例】以下、本発明を実施例によりさらに具体的に
説明する。 （実施例１）火山礫（鹿児島県桜島産）１００重量部、
普通ポルトランドセメント８０重量部をそれぞれドラム
型転動式造粒機に入れた。次に、この造粒機を回転させ
ながら造粒機内に水１４重量部を噴霧し、火山礫の表面
に普通ポルトランドセメントペーストを被膜させて造粒
物を得た。また、これとは別に普通ポルトランドセメン
ト８０重量部、水１４重量部を混練・成形して成形物を
得、この成形物と前記造粒物とを温度２０℃、相対湿度
９０％の同一の環境下でそれぞれ養生した。そして、成
形物の圧縮強度が１０ｋｇｆ／ｃｍ2 となったとき、前
記造粒物を６０℃、炭酸ガス濃度１０％の空気−炭酸ガ
スの混合ガス雰囲気中に入れ、さらに６時間養生して骨
材を得た。このようにして得られた骨材を粒径５ｍｍ以
下にふるい分けし、ふるい分け後のものについてＪＩＳ
Ａ １１０４に準拠して各種骨材試験を行い、その結
果を表１に示す。EXAMPLES The present invention will be described in more detail below with reference to examples. (Example 1) 100 parts by weight of gravels (produced in Sakurajima, Kagoshima Prefecture),
80 parts by weight of ordinary Portland cement were placed in a drum type rolling granulator. Next, while rotating this granulator, 14 parts by weight of water was sprayed into the granulator to coat the surface of the lapilli with ordinary Portland cement paste to obtain a granulated product. Separately, 80 parts by weight of ordinary Portland cement and 14 parts by weight of water are kneaded and molded to obtain a molded product, and the molded product and the granulated product are in the same environment at a temperature of 20 ° C. and a relative humidity of 90%. Each one was cured below. Then, when the compression strength of the molded product became 10 kgf / cm 2 , the granulated product was placed in an air-carbon dioxide mixed gas atmosphere having a carbon dioxide concentration of 10% at 60 ° C., and further cured for 6 hours. I got the material. The aggregate thus obtained is sieved to a particle size of 5 mm or less, and the sieved material is JIS.
Various aggregate tests were conducted according to A 1104, and the results are shown in Table 1.
【００１８】また、普通ポルトランドセメントに代え、
早強ポルトランドセメント、高炉セメントについても同
様の実験を行い、得られた結果を表１に併記する。さら
に、比較のため本実施例中で使用した原料である火山礫
を、セメントペースト処理しない通常の状態のままで各
種骨材試験を行い、その結果を表１に併記する。Also, instead of ordinary Portland cement,
Similar experiments were conducted for early-strength Portland cement and blast furnace cement, and the obtained results are also shown in Table 1. Further, for comparison, various aggregate tests were performed on the volcanic gravel, which is the raw material used in this example, in a normal state without cement paste treatment, and the results are also shown in Table 1.
【表１】 表１より、本発明品である改良骨材は、比較品である原
料の火山礫に比べ吸水率が大幅に低くなっていることが
確認された。[Table 1] From Table 1, it was confirmed that the improved aggregate, which is the product of the present invention, has a significantly lower water absorption rate than that of the comparative raw material, lapilli.
【００１９】（実施例２）人工軽量骨材（商品名：メサ
ライト、日本メサライト工業株式会社製）１００重量
部、普通ポルトランドセメント１００重量部をそれぞれ
ドラム型転動式造粒機に入れた。次に、この造粒機を回
転させながら造粒機内に水２０重量部を噴霧し、人工軽
量骨材の表面に普通ポルトランドセメントペーストを被
膜させて造粒物を得た。また、これとは別に普通ポルト
ランドセメント１００重量部、水２０重量部を混練・成
形して成形物を得、この成形物と前記造粒物とを温度２
０℃、相対湿度９０％の同一の環境下でそれぞれ養生し
た。そして、成形物の圧縮強度が１０ｋｇｆ／ｃｍ2 と
なったとき、前記造粒物を６０℃、炭酸ガス濃度１０％
の空気−炭酸ガスの混合ガス雰囲気中に入れ、さらに６
時間養生して骨材を得た。このようにして得られた骨材
を粒径５ｍｍ以下にふるい分けし、ふるい分け後のもの
について実施例１と同様に各種骨材試験を行い、その結
果を表２に示す。Example 2 100 parts by weight of artificial lightweight aggregate (trade name: Mesalite, manufactured by Nippon Mesalite Industry Co., Ltd.) and 100 parts by weight of ordinary Portland cement were placed in a drum type rolling granulator. Next, while rotating the granulator, 20 parts by weight of water was sprayed into the granulator to coat the surface of the artificial lightweight aggregate with ordinary Portland cement paste to obtain a granulated product. Separately, 100 parts by weight of ordinary Portland cement and 20 parts by weight of water are kneaded and molded to obtain a molded product, and the molded product and the granulated product are heated at a temperature of 2
Each was cured under the same environment of 0 ° C. and relative humidity of 90%. Then, when the compression strength of the molded product became 10 kgf / cm 2 , the granulated product was heated to 60 ° C. and the carbon dioxide concentration was 10%.
Put in a mixed gas atmosphere of air-carbon dioxide gas for 6 more
After curing for an hour, an aggregate was obtained. The aggregate thus obtained was sieved to a particle size of 5 mm or less, and various types of aggregate tests were performed on the aggregate after sieving in the same manner as in Example 1, and the results are shown in Table 2.
【００２０】また、普通ポルトランドセメントに代え、
早強ポルトランドセメント、高炉セメントについても同
様の実験を行い、得られた結果を表２に併記する。さら
に、比較のため本実施例中で使用した原料である人工軽
量骨材を、セメントペースト処理しない通常の状態のま
まで各種骨材試験を行い、その結果を表１に併記する。Also, instead of ordinary Portland cement,
The same experiment was conducted for early strength Portland cement and blast furnace cement, and the obtained results are also shown in Table 2. Further, for comparison, the artificial lightweight aggregate used as a raw material in this example was subjected to various aggregate tests in a normal state without cement paste treatment, and the results are also shown in Table 1.
【表２】 表２より、本発明品である改良骨材は、比較品である原
料の人工軽量骨材に比べ吸水率が大幅に低くなっている
ことが確認された。[Table 2] From Table 2, it was confirmed that the improved aggregate which is the product of the present invention has a significantly lower water absorption rate than the artificial lightweight aggregate which is a comparative product and is a raw material.
【００２１】（実施例３）火山礫１００重量部、普通ポ
ルトランドセメント８０重量部をドラム型転動式造粒機
に入れた。次に、この造粒機を回転させながら造粒機内
に水１４重量部を噴霧し、火山礫の表面に普通ポルトラ
ンドセメントペーストを被膜させて造粒物を得た。ま
た、これとは別に普通ポルトランドセメント８０重量
部、水１４重量部を混練・成形して成形物を得、この成
形物と前記造粒物とを温度２０℃、相対湿度９０％の同
一の環境下でそれぞれ養生した。そして成形物の圧縮強
度が０.１、１.０、１０、５０、１００ｋｇｆ／ｃｍ2
にそれぞれなった段階で、前記造粒物を６０℃、炭酸ガ
ス濃度１０％の空気−炭酸ガスの混合ガス雰囲気中に順
次入れ、それぞれ６時間ずつ養生して５種類の骨材を得
た。(Example 3) 100 parts by weight of lapilli and 80 parts by weight of ordinary Portland cement were put in a drum type rolling granulator. Next, while rotating this granulator, 14 parts by weight of water was sprayed into the granulator to coat the surface of the lapilli with ordinary Portland cement paste to obtain a granulated product. Separately, 80 parts by weight of ordinary Portland cement and 14 parts by weight of water are kneaded and molded to obtain a molded product, and the molded product and the granulated product are in the same environment at a temperature of 20 ° C. and a relative humidity of 90%. Each one was cured below. And the compression strength of the molded product is 0.1, 1.0, 10, 50, 100 kgf / cm 2.
At each stage, the granules were sequentially placed in an air-carbon dioxide mixed gas atmosphere having a carbon dioxide concentration of 10% at 60 ° C., and each was cured for 6 hours to obtain five kinds of aggregates.
【００２２】また、普通ポルトランドセメントに代え、
早強ポルトランドセメント、高炉セメントについても同
様の処理を行い、それぞれ５種類ずつの骨材を得た。次
いで、得られた骨材をそれぞれ５ｍｍ以下にふるい分け
した。その後、ＪＩＳ標準モルタルに基づき、普通ポル
トランドセメント３３重量部に、前記のふるい分け後の
骨材６７重量部、水２１.５重量部を加えてモルタルを
作製し、これを型枠に入れて成形し、翌日脱型して材例
７日まで水中養生を行った。得られたモルタル硬化体の
圧縮強度を測定し、その結果を表３に示す。Also, instead of ordinary Portland cement,
The same treatment was carried out on early-strength Portland cement and blast furnace cement, and five kinds of aggregates were obtained. Then, each of the obtained aggregates was sieved to 5 mm or less. Then, based on JIS standard mortar, 33 parts by weight of ordinary Portland cement was added with 67 parts by weight of the aggregate after sieving and 21.5 parts by weight of water to prepare a mortar, which was put in a mold and molded. The mold was removed from the mold the next day, and the material was subjected to underwater curing until the 7th day. The compression strength of the obtained cured mortar was measured, and the results are shown in Table 3.
【００２３】（比較例１）上記実施例と同様にして火山
礫１００重量部、普通ポルトランドセメント８０重量部
をドラム型転動式造粒機に入れた。次に、この造粒機を
回転させながら造粒機内に水１４重量部を噴霧し、火山
礫の表面にセメントペーストを被膜させて造粒物を得
た。また、これとは別に普通ポルトランドセメント８０
重量部、水１４重量部を混練・成形して成形物を得、こ
の成形物と前記造粒物とを温度２０℃、相対湿度９０％
の同一の環境下でそれぞれ養生した。そして成形物の圧
縮強度が０.１、１.０、１０、５０、１００ｋｇｆ／ｃ
ｍ2にそれぞれなった段階で、前記造粒物を６０℃、相
対湿度９０％の湿空気中に順次入れ、それぞれ６時間ず
つ養生して５種類の骨材を得た。Comparative Example 1 100 parts by weight of lapilli and 80 parts by weight of ordinary Portland cement were placed in a drum type rolling granulator in the same manner as in the above example. Next, while rotating the granulator, 14 parts by weight of water was sprayed into the granulator to coat the cement paste on the surface of the lapilli to obtain a granulated product. In addition to this, ordinary Portland cement 80
By mixing and molding 14 parts by weight of water and 14 parts by weight of water to obtain a molded product, the molded product and the granulated product are heated at a temperature of 20 ° C. and a relative humidity of 90%.
Were cured under the same environment. And the compression strength of the molded product is 0.1, 1.0, 10, 50, 100 kgf / c
At the stage of reaching m 2 , the granulated product was sequentially put into wet air of 60 ° C. and 90% of relative humidity, and cured for 6 hours each to obtain 5 kinds of aggregates.
【００２４】また、普通ポルトランドセメントに代え、
早強ポルトランドセメント、高炉セメントについても同
様の処理を行い、それぞれ５種類ずつの骨材を得た。次
いで、得られた骨材をそれぞれ５ｍｍ以下にふるい分け
した。その後、ＪＩＳ標準モルタルに基づき、普通ポル
トランドセメント３３重量部に、前記のふるい分け後の
骨材６７重量部、水２１.５重量部を加えてモルタルを
作製し、これを型枠に入れて成形し、翌日脱型して材例
７日まで水中養生を行った。得られたモルタル硬化体の
圧縮強度を測定し、その結果を表３に併記する。Also, instead of ordinary Portland cement,
The same treatment was carried out on early-strength Portland cement and blast furnace cement, and five kinds of aggregates were obtained. Then, each of the obtained aggregates was sieved to 5 mm or less. Then, based on JIS standard mortar, 33 parts by weight of ordinary Portland cement was added with 67 parts by weight of the aggregate after sieving and 21.5 parts by weight of water to prepare a mortar, which was put in a mold and molded. The mold was removed from the mold the next day, and the material was subjected to underwater curing until the 7th day. The compressive strength of the obtained cured mortar was measured, and the results are also shown in Table 3.
【表３】 表３より、炭酸ガス雰囲気で養生処理した骨材を使用し
てなる本実施例品は、炭酸ガス雰囲気でなく通常の空気
雰囲気で養生処理した骨材を使用してなる比較例品に比
べ、格段に圧縮強度が高くなってきており、本発明方法
によって得られた軽量骨材がこれを配合してなるセメン
ト製品の強度向上にきわめて高い効果を奏することが確
認された。[Table 3] From Table 3, it can be seen that the product of this example, which uses the aggregate cured in a carbon dioxide atmosphere, is compared with the product of the comparative example, which uses the aggregate cured in a normal air atmosphere instead of the carbon dioxide atmosphere. The compressive strength has been remarkably increased, and it was confirmed that the lightweight aggregate obtained by the method of the present invention has a very high effect on the strength improvement of the cement product containing the lightweight aggregate.
【００２５】[0025]
【発明の効果】以上説明したように本発明の軽量骨材の
製造方法は、軽量骨材表面上のセメントペースト被膜に
炭酸ガスを接触させ、セメントペーストの水和を促進し
てセメント硬化体に形成される細孔を埋め、しかも炭酸
化により水和を促進するものであるから、細孔がきわめ
て少なく強度の高いセメント被膜を軽量骨材上に形成す
ることができ、よって吸水率が低くしかもこの軽量骨材
を配合したセメント製品の強度を高めることのできるき
わめて有効な軽量骨材を製造することができる。As described above, the method for producing a lightweight aggregate of the present invention is such that carbon dioxide is brought into contact with the cement paste coating film on the surface of the lightweight aggregate to promote hydration of the cement paste to form a hardened cement body. Since it fills the pores that are formed and promotes hydration by carbonation, a cement coating with very few pores and high strength can be formed on the lightweight aggregate, which results in low water absorption. It is possible to produce a very effective lightweight aggregate that can increase the strength of a cement product containing this lightweight aggregate.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 佐藤 雅男 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Sato, 585 Tomimachi, Funabashi, Chiba Prefecture Sumitomo Cement Co., Ltd. Central Research Laboratory (72) Inventor, Kiyohiko Uchida 585, Tomimachi, Funabashi, Chiba Sumitomo Cement Co., Ltd. Central Research Center
Claims (2)
骨材の表面にセメントペーストを付着せしめてセメント
ペースト被膜を形成し、その後該被膜形成軽量骨材を炭
酸ガス雰囲気中で養生することを特徴とする軽量骨材の
製造方法。1. A cement paste coating is formed by adhering cement paste to the surface of natural lightweight aggregate such as volcanic gravel or artificial lightweight aggregate, and then curing the coated lightweight aggregate in a carbon dioxide atmosphere. And a method for manufacturing a lightweight aggregate.
骨材の表面にセメントペーストを付着せしめてセメント
ペースト被膜を形成し、次いで０〜８０℃で養生を行
い、またこれと同時に前記セメントペーストと同じ水／
セメント比、同じ養生条件でセメントペーストを成形養
生し、この養生セメントペーストの圧縮強度が０.１ｋ
ｇｆ／ｃｍ2 〜６００ｋｇｆ／ｃｍ2 に達した以後に、
前記セメントペースト被膜形成軽量骨材を３０〜９００
℃の炭酸ガス雰囲気中で養生することを特徴とする軽量
骨材の製造方法。2. A cement paste coating is formed by adhering a cement paste on the surface of a natural lightweight aggregate such as volcanic gravel or an artificial lightweight aggregate, followed by curing at 0 to 80 ° C., and at the same time, the cement. Same water as paste /
The cement paste is molded and cured under the same curing conditions as the cement ratio, and the compressive strength of this curing cement paste is 0.1k.
After reaching gf / cm 2 to 600 kgf / cm 2 ,
The cement paste film-forming lightweight aggregate is 30 to 900
A method for producing a lightweight aggregate characterized by curing in a carbon dioxide atmosphere at ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04188448A JP3093036B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of lightweight aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04188448A JP3093036B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of lightweight aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0692700A true JPH0692700A (en) | 1994-04-05 |
| JP3093036B2 JP3093036B2 (en) | 2000-10-03 |
Family
ID=16223874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04188448A Expired - Fee Related JP3093036B2 (en) | 1992-07-15 | 1992-07-15 | Manufacturing method of lightweight aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3093036B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5935317A (en) * | 1995-08-02 | 1999-08-10 | Dpd, Inc. | Accelerated curing of cement-based materials |
| JP2013234083A (en) * | 2012-05-07 | 2013-11-21 | Kajima Corp | Method for manufacturing concrete product |
| JP2013234084A (en) * | 2012-05-07 | 2013-11-21 | Kajima Corp | Method for manufacturing concrete product |
| US10077210B2 (en) | 2015-05-12 | 2018-09-18 | Raymond C. Turpin, Jr. | Encapsulated lightweight polymer aggregates |
| CN108640552A (en) * | 2018-05-04 | 2018-10-12 | 江苏省安全生产科学研究院 | A technique for preparing heat-insulation wall plate lightweight aggregate using bagasse and portland cement |
-
1992
- 1992-07-15 JP JP04188448A patent/JP3093036B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5935317A (en) * | 1995-08-02 | 1999-08-10 | Dpd, Inc. | Accelerated curing of cement-based materials |
| JP2013234083A (en) * | 2012-05-07 | 2013-11-21 | Kajima Corp | Method for manufacturing concrete product |
| JP2013234084A (en) * | 2012-05-07 | 2013-11-21 | Kajima Corp | Method for manufacturing concrete product |
| US10077210B2 (en) | 2015-05-12 | 2018-09-18 | Raymond C. Turpin, Jr. | Encapsulated lightweight polymer aggregates |
| CN108640552A (en) * | 2018-05-04 | 2018-10-12 | 江苏省安全生产科学研究院 | A technique for preparing heat-insulation wall plate lightweight aggregate using bagasse and portland cement |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3093036B2 (en) | 2000-10-03 |
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