JP2002255614A - Artificial plastic lightweight aggregate - Google Patents
Artificial plastic lightweight aggregateInfo
- Publication number
- JP2002255614A JP2002255614A JP2001048510A JP2001048510A JP2002255614A JP 2002255614 A JP2002255614 A JP 2002255614A JP 2001048510 A JP2001048510 A JP 2001048510A JP 2001048510 A JP2001048510 A JP 2001048510A JP 2002255614 A JP2002255614 A JP 2002255614A
- Authority
- JP
- Japan
- Prior art keywords
- aggregate
- lightweight aggregate
- cement
- vinyl chloride
- absolute dry
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、塩化ビニル系樹脂
を骨材としてセメント材料に大量に混入し得る、塩化ビ
ニル系樹脂廃棄物の有効利用が可能なプラスチック人工
軽量骨材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic artificial lightweight aggregate capable of effectively utilizing vinyl chloride resin waste as a vinyl chloride resin as an aggregate in a cement material.
【０００２】[0002]
【従来の技術】軽量骨材としてプラスチック廃棄物を利
用しようとした場合、例えばプラスチックを直接セメン
トスラリーに混入した場合、プラスチックとセメントと
の親和性が低いことから、プラスチック廃棄物を大量に
添加すると、得られる成形体の物性が低下するといった
問題があった。2. Description of the Related Art When plastic waste is used as a lightweight aggregate, for example, when plastic is directly mixed into a cement slurry, a large amount of plastic waste is added due to a low affinity between plastic and cement. However, there is a problem that the physical properties of the obtained molded body are reduced.
【０００３】これに対してプラスチック廃棄物の表面を
結合強化材によって被覆することにより、プラスチック
とコンクリートとの密着性を改善したコンクリート用廃
棄物骨材が提案されている（特開平１１−２９２５８９
号公報）。On the other hand, a concrete waste aggregate in which the adhesion between plastic and concrete is improved by coating the surface of plastic waste with a bonding reinforcing material has been proposed (JP-A-11-292589).
No.).
【０００４】上記の骨材はコンクリート成形体の初期強
度の改善に対して有効であったが、コンクリート成形体
の長期物性において問題を生じる場合があった。例え
ば、コンクリート成形体の膨張収縮による寸法変化が蓄
積される等の問題が認められている。[0004] Although the above-mentioned aggregate is effective for improving the initial strength of the concrete molded product, it sometimes causes a problem in the long-term physical properties of the concrete molded product. For example, problems such as accumulation of dimensional changes due to expansion and contraction of the concrete molded body have been recognized.
【０００５】一方、プラスチック廃棄物の中でも塩化ビ
ニル系樹脂の廃棄物は油化等のリサイクル方法が技術的
に困難であり、現状では埋め立て以外に有効な処分方法
が確立されていないという問題がある。[0005] On the other hand, among plastic wastes, vinyl chloride resin waste is technically difficult to recycle such as oil, and there is a problem that no effective disposal method other than landfill has been established at present. .
【０００６】[0006]
【発明が解決しようとする課題】本発明は、上記問題を
解決するためになされたものであり、骨材として利用し
た場合に得られるコンクリート成形体の耐久性が損なわ
れず機械的強度が十分に発現される、塩化ビニル系樹脂
廃棄物を利用したプラスチック人工軽量骨材を提供する
ことを目的とする。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and the durability of a concrete molded product obtained when used as an aggregate is not impaired and the mechanical strength is sufficiently high. It is an object of the present invention to provide a plastic artificial lightweight aggregate using a vinyl chloride resin waste that is expressed.
【０００７】[0007]
【課題を解決するための手段】本発明のプラスチック人
工軽量骨材（以下、単に「軽量骨材」ということがあ
る）は、塩化ビニル系樹脂粉砕物の表面の少なくとも一
部にセメント硬化体皮膜が被覆されてなる軽量骨材であ
って、上記セメント硬化体皮膜の絶乾密度が１．６ｇ／
ｃｍ3 以上であり、上記軽量骨材の絶乾密度が、１．４
〜２ｇ／ｃｍ3 であることを特徴とする。The plastic artificial lightweight aggregate of the present invention (hereinafter sometimes simply referred to as "lightweight aggregate") has a hardened cement coating on at least a part of the surface of a pulverized vinyl chloride resin. Is a lightweight aggregate, wherein the cured cement coating has an absolute dry density of 1.6 g /
cm 3 or more, and the absolute dry density of the lightweight aggregate is 1.4.
２2 g / cm 3 .
【０００８】本発明に用いられる塩化ビニル系樹脂は、
特に限定されるものではなく、例えば、塩化ビニル樹
脂、塩素化塩化ビニル樹脂、塩化ビニル樹脂共重合体等
が挙げられる。上記塩化ビニル系樹脂は、硬質塩化ビニ
ル系樹脂であってもよいし、軟質塩化ビニル系樹脂であ
ってもよいが、骨材としての強度発現のためは、硬質塩
化ビニル系樹脂が好ましい。塩化ビニル系樹脂を使用し
た場合、皮膜に一般のポルトランドセメントを使用して
も好適な被覆状態を得ることができる。[0008] The vinyl chloride resin used in the present invention comprises:
There is no particular limitation, and examples thereof include vinyl chloride resins, chlorinated vinyl chloride resins, and vinyl chloride resin copolymers. The vinyl chloride-based resin may be a hard vinyl chloride-based resin or a soft vinyl chloride-based resin. However, a hard vinyl chloride-based resin is preferable in order to exhibit strength as an aggregate. When a vinyl chloride resin is used, a suitable coating state can be obtained even when a general Portland cement is used for the film.
【０００９】上記塩化ビニル系樹脂粉砕物は、通常、各
種塩化ビニル系樹脂成形体として成形された物の粉砕物
が用いられるが、成形工程において形成された廃棄物の
粉砕物であってもよい。一般に骨材の粒径は、目的とす
るコンクリート成形体の厚みと、成形に供する材料の流
動性によって決定されるが、本発明の軽量骨材では、塩
化ビニル系樹脂粉砕物の粒径を制御することで、細骨材
として利用する２００μｍ程度から、粗骨材として利用
する５ｍｍ以上のものまで様々な大きさの範囲に調整が
可能である。As the above-mentioned pulverized vinyl chloride resin, usually, pulverized products of various vinyl chloride resin molded products are used, but pulverized products of wastes formed in the molding step may be used. . In general, the particle size of the aggregate is determined by the thickness of the target concrete molded product and the fluidity of the material to be molded. In the lightweight aggregate of the present invention, the particle size of the pulverized vinyl chloride resin is controlled. By doing so, it is possible to adjust the size to various sizes from about 200 μm used as fine aggregate to 5 mm or more used as coarse aggregate.
【００１０】本発明において塩化ビニル系樹脂粉砕物の
表面を被覆するセメント硬化体皮膜とは、セメント材料
を主成分とする硬化体の皮膜である。上記セメント硬化
体皮膜は、上記塩化ビニル系樹脂粉砕物の表面の少なく
とも一部がを覆さしてなるものであり、上記皮膜の厚み
は特に限定されるものではないが、厚すぎると軽量骨材
としての軽量化効果が損なわれるため、５ｍｍ以下が好
ましい。また、上記セメント硬化体皮膜は、上記塩化ビ
ニル系樹脂粉砕物から容易に脱落しない程度の範囲を被
覆していることが好ましく、具体的には塩化ビニル系樹
脂粉砕物の表面の半分以上の面積を被覆していることが
好ましい。In the present invention, the hardened cement film that covers the surface of the pulverized vinyl chloride resin is a hardened film mainly composed of a cement material. The cement hardened body film is formed by covering at least a part of the surface of the crushed vinyl chloride resin, and the thickness of the film is not particularly limited. 5 mm or less is preferable because the weight-saving effect of the is impaired. Further, it is preferable that the cement-hardened body film covers an area that does not easily fall off from the crushed vinyl chloride resin, specifically, an area of at least half of the surface of the crushed vinyl chloride resin. Is preferably coated.
【００１１】本発明に用いられるセメント材料として
は、珪酸カルシウム化合物を中心としてなる一般のセメ
ント材料であれば特に限定されず、通常、真密度が２．
８ｇ／ｃｍ3 以上のものが使用される。上記セメント材
料としては、例えば、普通ポルトランドセメント、早強
ポルトランドセメント、超早強ポルトランドセメント、
中庸熱ポルトランドセメント、低熱ポルトランドセメン
ト、耐硫酸塩ポルトランドセメント、各種低アルカリ形
ポルトランドセメント等のポルトランドセメント；高炉
セメント、シリカセメント、フライアッシュセメント等
の混合セメント；白色セメントなどが挙げられるが、コ
スト等を考慮するとポルトランドセメント好適である。
これらは単独で使用されてもよいし、２種類以上併用さ
れてもよい。上記セメント材料には各種混和剤が添加さ
れてもよいし、セメント材料のみであってもよい。The cement material used in the present invention is not particularly limited as long as it is a general cement material mainly comprising a calcium silicate compound.
Those having a density of 8 g / cm 3 or more are used. As the cement material, for example, ordinary Portland cement, early-strength Portland cement, ultra-high-strength Portland cement,
Portland cements such as moderate heat Portland cement, low heat Portland cement, sulfate resistant Portland cement, various low alkali type Portland cements; mixed cements such as blast furnace cement, silica cement, fly ash cement; white cement, etc. Considering the above, Portland cement is suitable.
These may be used alone or in combination of two or more. Various admixtures may be added to the cement material, or only the cement material may be used.
【００１２】上記セメント硬化体皮膜の絶乾密度は、低
すぎると皮膜自体の強度が小さくなり十分な耐久性が得
られないので、１．６ｇ／ｃｍ3 以上に限定される。ま
た、絶乾密度が大きすぎると、セメント材料が十分反応
せずに被覆されている場合があるので，１．７〜２．５
ｇ／ｃｍ3 が好ましい。[0012] oven dry density of the hardened cement paste coating, since too low strength of the film itself can not be obtained sufficient durability decreases, is limited to 1.6 g / cm 3 or more. On the other hand, if the absolute dry density is too large, the cement material may be coated without reacting sufficiently.
g / cm 3 is preferred.
【００１３】なお、ここでいう絶乾密度とは、乾燥状態
における皮膜の嵩密度のことをいい、通常は、得られる
骨材から硬化体皮膜を剥離して測定するものであるが、
剥離することが困難な場合、式（１）により求めること
ができる。 皮膜の絶乾密度＝｛Ｄad−（１−Ｖa)・Ｄrd｝・Ｄcd／ （Ｄad＋Ｖa・Ｄcd−Ｄrd） ・・・（１）The term "absolute dry density" as used herein refers to the bulk density of a film in a dry state, which is usually measured by peeling a cured body film from the obtained aggregate.
When peeling is difficult, it can be determined by equation (1). Absolute dry density of the film = {Dad- (1-Va) -Drd} -Dcd / (Dad + Va-Dcd-Drd) (1)
【００１４】ここで、 Ｄrd：樹脂絶乾密度 Ｄad：プラスチック人工軽量骨材の絶乾密度（測定によ
り求める） Ｄcd：セメントペースト硬化体の絶乾密度 （ポルトランドセメントの場合２．２ｇ／ｃｍ3 と仮
定） Ｖa ：骨材空隙率（測定により求める）Here, Drd: Absolute dry density of resin Dad: Absolute dry density of plastic artificial lightweight aggregate (determined by measurement) Dcd: Absolute dry density of hardened cement paste (2.2 g / cm 3 in case of Portland cement Assumption) Va: Aggregate porosity (determined by measurement)
【００１５】上記の式は骨材の空隙は全てセメント硬化
体皮膜中に存在するものとして、下記式より導びかれた
ものである。 プラスチック人工軽量骨材の絶乾密度Ｄad＝（セメン
ト部分の重量＋樹脂部分の重量）／（セメント部分の体
積＋空隙部分の体積＋塩化ビニル系樹脂部分の体積） 皮膜の絶乾密度＝セメント部分の重量／（セメント部
分の体積＋空隙部分の体積）The above equation is derived from the following equation, assuming that all voids in the aggregate are present in the cement hardened body coating. Absolute dry density Dad of plastic artificial lightweight aggregate = (weight of cement part + weight of resin part) / (volume of cement part + volume of void part + volume of vinyl chloride resin part) Absolute dry density of coating = cement part Weight / (volume of cement part + volume of void part)
【００１６】本発明のプラスチック人工軽量骨材の絶乾
密度は、低すぎると、セメント材料の被覆量が少なす
ぎ、コンクリートとの親和性が低下するか、皮膜が弱い
ものとなり、高すぎると、軽量骨材として適当でないの
で１．４〜２ｇ／ｃｍ3 に限定される。If the absolute dry density of the plastic artificial lightweight aggregate of the present invention is too low, the coating amount of the cement material is too small, the affinity with concrete is lowered, or the coating becomes weak, and if it is too high, Since it is not suitable as a lightweight aggregate, it is limited to 1.4 to 2 g / cm 3 .
【００１７】本発明のプラスチック人工軽量骨材の製造
方法は特に限定されるものではないが、例えば、塩化ビ
ニル系樹脂粉砕物、セメント材料及び水を混合して造
粒、乾燥、養生することによって得ることができる。The method for producing the plastic artificial lightweight aggregate of the present invention is not particularly limited. For example, a method of mixing, pulverizing a vinyl chloride resin, a cement material and water, granulating, drying and curing the mixture. Obtainable.
【００１８】［造粒］上記造粒方法において、水の配合
量は、セメント材料１００重量部に対して、２０〜６０
重量部が好ましく、より好ましくは３０〜５０重量部で
ある。水が少なすぎても多すぎても皮膜密度が目的の密
度より小さくなったり、被覆量が低下してプラスチック
人工軽量の絶乾密度が小さくなる。塩化ビニル系樹脂粉
砕物とセメント材料セメントとの配合量は目的の絶乾密
度になるように任意に配合すればよい。[Granulation] In the above granulation method, the mixing amount of water is from 20 to 60 parts by weight based on 100 parts by weight of the cement material.
The amount is preferably 30 parts by weight, more preferably 30 to 50 parts by weight. If the amount of water is too small or too large, the film density will be lower than the target density, or the coating amount will decrease, and the absolute dry density of the plastic artificial lightweight will decrease. The compounding amount of the pulverized vinyl chloride resin and the cement material cement may be arbitrarily added so as to obtain a target absolute dry density.
【００１９】上記塩化ビニル系樹脂粉砕物、セメント材
料及び水の混合方法は特に限定されるものでなく、塩化
ビニル系樹脂粉砕物の種類、粒径等により適当な方法を
用いればよい。例えば塩化ビニル系樹脂粉砕物とセメン
ト材料とを混合した後に、造粒機等の中で攪拌しながら
水を添加する方法や、塩化ビニル系樹脂粉砕物に予め調
製したセメントペーストを添加して造粒する方法等が挙
げられる。また、造粒方法についても一般の造粒方法で
よく、転動式のものや圧縮成形方法等が採用される。The method of mixing the pulverized vinyl chloride resin, cement material and water is not particularly limited, and an appropriate method may be used depending on the type, particle size, etc. of the pulverized vinyl chloride resin. For example, a method in which water is added with stirring in a granulator or the like after mixing a crushed polyvinyl chloride resin and a cement material, or a method in which a previously prepared cement paste is added to a crushed vinyl chloride resin to form a cement. And the like. The granulation method may be a general granulation method, and a rolling method, a compression molding method, or the like is employed.
【００２０】［乾燥］乾燥は、造粒した粒子同士が結着
することを防止するために必要な工程である。但し、過
度に乾燥した場合、皮膜中のセメント材料の水和反応が
進行せず、絶乾密度が大きくもろい皮膜が形成される。
好適な皮膜を得るためには乾燥後の骨材中の含水率が、
セメント材料に対して１５重量％以上であることが好ま
しい。[Drying] Drying is a necessary step for preventing the granulated particles from binding to each other. However, when the coating is excessively dried, the hydration reaction of the cement material in the coating does not proceed, and a coating having a high absolute dry density and a brittle coating is formed.
In order to obtain a suitable film, the moisture content in the dried aggregate is
It is preferably at least 15% by weight based on the cement material.
【００２１】［養生］養生方法は特に限定されず、製造
後、骨材として実用に供するまでを養生期間として活用
してもよい。このような場合、常温で、製造後２日程度
の養生期間は必要であり、養生期間が長い場合は問題は
無い。また、加熱して短時間で目的の骨材を得ようとす
る場合、養生温度は１００℃以下が好ましい。１００℃
以上になると樹脂の膨張によってセメント硬化体皮膜、
又は、樹脂とセメント硬化体皮膜界面が破壊され、骨材
の吸水率が大きくなったりコンクリートとした際の強度
が低下するなど、骨材物性が低下する。[Curing] The curing method is not particularly limited, and the period from production to practical use as an aggregate may be used as the curing period. In such a case, a curing period of about two days after production at room temperature is necessary, and there is no problem if the curing period is long. Further, when it is intended to obtain the target aggregate in a short time by heating, the curing temperature is preferably 100 ° C. or less. 100 ℃
Above this, due to the expansion of the resin, hardened cement film,
Alternatively, the physical properties of the aggregate are deteriorated, for example, the interface between the resin and the hardened cement film is broken, the water absorption of the aggregate is increased, and the strength of the concrete is reduced.
【００２２】本発明のプラスチック人工軽量骨材は、例
えばコンクリート用骨材として一般の軽量骨材と同様に
使用される。上記軽量骨材の添加量は、コンクリート中
に実質的に添加可能な範囲以下であれば特に限定されな
いが、軽量骨材の含有量が３０体積％以下である場合、
本発明の骨材を使用しなくても樹脂を微粉砕して添加す
ることである程度の強度発現と軽量化の目的を達成する
ことができる。従って、軽量骨材の含有率が３０体積％
以上である場合、本発明の軽量骨材は非常に有用であ
る。The plastic artificial lightweight aggregate of the present invention is used, for example, as an aggregate for concrete in the same manner as a general lightweight aggregate. The addition amount of the lightweight aggregate is not particularly limited as long as it is not more than a range that can be substantially added to concrete, but when the content of the lightweight aggregate is 30% by volume or less,
Even if the aggregate of the present invention is not used, the purpose of a certain degree of strength development and weight reduction can be achieved by pulverizing and adding the resin. Therefore, the content of the lightweight aggregate is 30% by volume.
In this case, the lightweight aggregate of the present invention is very useful.
【００２３】（作用）本発明のプラスチック人工軽量骨
材は、塩化ビニル系樹脂粉砕物の表面の少なくとも一部
にセメント硬化体皮膜が被覆されてなる軽量骨材であっ
て、上記セメント硬化体皮膜の絶乾密度が１．６ｇ／ｃ
ｍ3 以上であり、上記軽量骨材の絶乾密度が、１．４〜
２ｇ／ｃｍ3 であり、軽量骨材表面が緻密な組織のセメ
ント硬化体皮膜で被覆されているため、軽量骨材として
コンクリート成形体に使用した際、軽量骨材とコンクリ
ートマトリックスとの界面が安定し、コンクリート中に
大量にプラスチックを含みつつ耐久性が良好な成形体が
得られる。(Function) The artificial plastic lightweight aggregate of the present invention is a lightweight aggregate obtained by coating at least a part of the surface of a pulverized vinyl chloride resin with a hardened cement film. Has an absolute dry density of 1.6 g / c
and the m 3 or more, oven dry density of the lightweight aggregate is 1.4
2 g / cm 3 , and the surface of the lightweight aggregate is coated with a dense cement hardened body film, so that when used as a lightweight aggregate in a concrete molding, the interface between the lightweight aggregate and the concrete matrix is stable However, a molded article having good durability while containing a large amount of plastic in concrete can be obtained.
【００２４】[0024]
【実施例】（実施例、比較例１〜３）廃棄物として発生
した硬質塩化ビニル樹脂成形体（絶乾密度１．３２ｇ／
ｃｍ 3)を粒径５ｍｍ程度に粉砕し、表１に示した所定量
の普通ポルトランドセメント、水を造立機〔アイリッヒ
ミキサー（アイリッヒ社製、型式「Ｒ０８Ｗ」）、パン
型転動式造立機、オムニミキサー）に投入し、１５分混
合、造粒した。造粒後、造粒物を所定温度で、セメント
材料に対する水の含有量を表１に示した所定量になるま
で乾燥を行った。その後、屋外に３日間放置して養生
し、プラスチック人工軽量骨材を得た。Examples (Examples, Comparative Examples 1 to 3) Generated as waste
Hard vinyl chloride resin molded product (absolute dry density 1.32g /
cm Three) Is ground to a particle size of about 5 mm, and
Of ordinary Portland cement and water
Mixer (Model: "R08W" manufactured by Erich), bread
Tumbling type laying machine, omni mixer) and mix for 15 minutes
If combined, granulated. After granulation, the granulated material is
Reduce the water content of the material to the specified amount shown in Table 1.
For drying. Then leave it outdoors for 3 days to cure
Then, a plastic artificial lightweight aggregate was obtained.
【００２５】セメント硬化体皮膜及びプラスチック人工
軽量骨材の絶乾密度を測定、算出した結果を表１に示し
た。皮膜の絶乾密度は、プラスチック人工軽量骨材の絶
乾密度、硬質塩化ビニル樹脂の絶乾密度（１．３２ｇ／
ｃｍ3)、骨材空隙率を測定し、セメントペースト硬化体
の絶乾密度を２．２ｇ／ｃｍ3として、式（１）より算
出した。次に、普通ポルトランドセメント１００重量
部、水４５重量部、混和剤（ポゾリス２００Ｎ−２５
０）０．２５重量部に対し、得られたプラスチック人工
軽量骨材と川砂を、体積比で１．５：１とした骨材を、
全骨材の容積率６９％となるように配合を行い、直径１
５０ｍｍ、高さ２００ｍｍの円柱状及び長さ２００ｍ
ｍ、４０ｍｍ角の角柱状のコンクリート成形体を得た。
養生は水中養生２８日間とした。また、これらのコンク
リート成形体製造用混合物の単位体積質量（ｔ／ｍ3)を
測定した。実施例及び比較例１〜３にて得られたコンク
リート成形体を以下の評価に供した。Table 1 shows the results of measuring and calculating the absolute dry densities of the cured cement body coating and the plastic artificial lightweight aggregate. The absolute dry density of the film is the absolute dry density of plastic artificial lightweight aggregate and the absolute dry density of hard vinyl chloride resin (1.32 g /
cm 3 ) and the aggregate porosity were measured, and the absolute dry density of the cured cement paste was 2.2 g / cm 3 , which was calculated from the formula (1). Next, 100 parts by weight of ordinary Portland cement, 45 parts by weight of water, an admixture (Pozoris 200N-25)
0) The obtained plastic artificial lightweight aggregate and river sand, with respect to 0.25 parts by weight, were mixed with an aggregate having a volume ratio of 1.5: 1,
Mixing was performed so that the volume ratio of all aggregates was 69%, and the diameter was 1
50mm, height 200mm cylindrical shape and length 200m
m, a 40 mm square prism-shaped concrete molded body was obtained.
Curing was carried out for 28 days in water. Further, the unit volume mass (t / m 3 ) of the mixture for producing a concrete molded body was measured. The concrete molded bodies obtained in the examples and comparative examples 1 to 3 were subjected to the following evaluations.
【００２６】評価 （引張強度）得られた円柱状のコンクリート成形体を所
定寸法に切断して試験片とし、ＪＩＳ Ａ１１１３に準
拠して割裂破壊による引張強度を測定した。 Evaluation (Tensile Strength) The obtained cylindrical concrete molded product was cut into a predetermined size to obtain a test piece, and the tensile strength due to split fracture was measured in accordance with JIS A1113.
【００２７】（寸法変化の測定）得られた角柱状のコン
クリート成形体を６０℃で２４時間乾燥して初期寸法と
し、室温で水中に２４時間浸漬と６０℃で２４時間乾燥
のサイクルを６サイクル繰り返した際の寸法変化率を測
定した。尚、乾燥時の寸法は６０℃オーブンから取り出
し後、ドライキャビネットで１時間放置した後に測定し
た値を示している。以上の結果を表１に纏めて示した。(Measurement of Dimensional Change) The obtained prism-shaped concrete molded body was dried at 60 ° C. for 24 hours to obtain initial dimensions, and a cycle of immersion in water at room temperature for 24 hours and drying at 60 ° C. for 24 hours was 6 cycles. The dimensional change rate when repeating was measured. In addition, the dimension at the time of drying has shown the value measured after taking out from 60 degreeC oven and leaving it to stand in a dry cabinet for 1 hour. The above results are summarized in Table 1.
【００２８】[0028]
【表１】 [Table 1]
【００２９】表１から判る通り、実施例で得られたプラ
スチック人工軽量骨材は低密度、低空隙率の軽量骨材と
なっている。これに対して比較例１及び２の骨材は空隙
率が大きく、比較例３で製造した骨材は骨材の絶乾密度
が大きい。そのためこれらの骨材を使用してコンクリー
ト成形体を製造した場合、比較例１及び２の場合は引張
強度が小さくなり、比較例３の場合はほとんど成形体の
軽量化が図られていない。また、セメント硬化体皮膜の
絶乾密度が適当である実施例の骨材を使用したコンクリ
ート成形体では乾湿繰り返し試験を行った際の寸法変化
量が小さいのに対して、セメント硬化体皮膜の絶乾密度
が小さい比較例１及び２の骨材を使用したコンクリート
成形体では、水中浸漬と乾燥を繰り返すと、著しい寸法
変化が認められた。As can be seen from Table 1, the plastic artificial lightweight aggregate obtained in the examples is a lightweight aggregate having a low density and a low porosity. On the other hand, the aggregates of Comparative Examples 1 and 2 have a high porosity, and the aggregate manufactured in Comparative Example 3 has a large absolute dry density of the aggregate. Therefore, when a concrete molded body is manufactured using these aggregates, the tensile strength is reduced in Comparative Examples 1 and 2, and the weight of the molded body is hardly reduced in Comparative Example 3. In addition, in the concrete molded body using the aggregate of the example in which the absolute dry density of the hardened cement film is appropriate, the dimensional change when the dry-wet repeated test was performed was small, while the absolute amount of the hardened cement film was small. In the concrete compacts using the aggregates of Comparative Examples 1 and 2 having low dry densities, remarkable dimensional changes were observed when immersion in water and drying were repeated.
【００３０】[0030]
【発明の効果】本発明のプラスチック人工軽量骨材は、
上述の如き構成となされているので、骨材として利用し
た場合に得られるコンクリート成形体の耐久性が損なわ
れず機械的強度が十分に発現される、塩化ビニル系樹脂
廃棄物を利用したプラスチック人工軽量骨材となる。The plastic artificial lightweight aggregate of the present invention
Since it is configured as described above, a plastic artificial lightweight using vinyl chloride-based resin waste, which exhibits sufficient mechanical strength without impairing the durability of the concrete molded product obtained when used as an aggregate. It becomes aggregate.
Claims (1)
とも一部にセメント硬化体皮膜が被覆されてなる軽量骨
材であって、上記セメント硬化体皮膜の絶乾密度が１．
６ｇ／ｃｍ3 以上であり、上記軽量骨材の絶乾密度が、
１．４〜２ｇ／ｃｍ3 であることを特徴とするプラスチ
ック人工軽量骨材。1. A lightweight aggregate in which at least a part of the surface of a pulverized vinyl chloride resin is coated with a hardened cement film, wherein the absolutely dry density of the hardened cement film is 1.
6 g / cm 3 or more, and the absolute dry density of the lightweight aggregate is
A plastic artificial lightweight aggregate having a weight of 1.4 to 2 g / cm 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001048510A JP2002255614A (en) | 2001-02-23 | 2001-02-23 | Artificial plastic lightweight aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001048510A JP2002255614A (en) | 2001-02-23 | 2001-02-23 | Artificial plastic lightweight aggregate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002255614A true JP2002255614A (en) | 2002-09-11 |
Family
ID=18909765
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001048510A Pending JP2002255614A (en) | 2001-02-23 | 2001-02-23 | Artificial plastic lightweight aggregate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002255614A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015093786A (en) * | 2013-11-08 | 2015-05-18 | 地方独立行政法人山口県産業技術センター | Colorant for calcium based reaction curable material, method for producing colorant and method for producing colored cured body |
| CN108484005A (en) * | 2018-02-27 | 2018-09-04 | 临沂晟鑫再生资源有限公司 | A kind of Methods for Polyurethane Wastes dry mixing composite light aggregate production method |
| KR20210067574A (en) * | 2019-11-29 | 2021-06-08 | 경기대학교 산학협력단 | Method for preparing artificial aggregate using recycled film materials |
-
2001
- 2001-02-23 JP JP2001048510A patent/JP2002255614A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015093786A (en) * | 2013-11-08 | 2015-05-18 | 地方独立行政法人山口県産業技術センター | Colorant for calcium based reaction curable material, method for producing colorant and method for producing colored cured body |
| CN108484005A (en) * | 2018-02-27 | 2018-09-04 | 临沂晟鑫再生资源有限公司 | A kind of Methods for Polyurethane Wastes dry mixing composite light aggregate production method |
| KR20210067574A (en) * | 2019-11-29 | 2021-06-08 | 경기대학교 산학협력단 | Method for preparing artificial aggregate using recycled film materials |
| KR102272182B1 (en) * | 2019-11-29 | 2021-07-02 | 경기대학교 산학협력단 | Method for preparing artificial aggregate using recycled film materials |
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