JP4701349B2 - Heat treatment of porcelain aggregate - Google Patents
Heat treatment of porcelain aggregate Download PDFInfo
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- JP4701349B2 JP4701349B2 JP2001087054A JP2001087054A JP4701349B2 JP 4701349 B2 JP4701349 B2 JP 4701349B2 JP 2001087054 A JP2001087054 A JP 2001087054A JP 2001087054 A JP2001087054 A JP 2001087054A JP 4701349 B2 JP4701349 B2 JP 4701349B2
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- aggregate
- porcelain
- asphalt
- heat treatment
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Classifications
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- 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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/26—Bituminous materials, e.g. tar, pitch
-
- 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
- C04B18/165—Ceramic waste
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- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- 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
Description
【０００１】
【発明の属する技術分野】
本発明は、アスファルト舗装体等の骨材成分として使用する磁器骨材に関し、詳しくは剥離抵抗性の向上した磁器骨材に関する。
【０００２】
【従来の技術】
道路用などのアスファルト舗装体は、骨材とアスファルトとで主要部を構成している。従来、骨材成分としては石粉、砂、砂利、砕石などが多く使用されていた。
【０００３】
アスファルト舗装体は、使用されるに従って磨耗する。特に、冬季にはタイヤチェーンなどによる擦り減りによりわだち掘れが生じ、また、夏季には舗装表面温度が６０℃程度まで上昇してアスファルト舗装体が軟化することによりわだち掘れが生じ、大がりな補修工事が必要となる。
【０００４】
アスファルト舗装体の耐磨耗性を向上するために、骨材成分として磁器骨材を使用したアスファルト舗装体が提供されている。磁器骨材は、高い硬度と耐磨耗性を有するため、骨材として使用するとアスファルト舗装体の耐磨耗性が向上する。特に、使用済みの電力用碍子を粉砕するなどしてリサイクルした磁器骨材は、電力用碍子がシリカ、アルミナを主成分とし、高温で焼き上げた磁器であるため、高い硬度と耐磨耗性を有する。また、電力用碍子などの白色の磁器は、アスファルトの表面に露出すると、アスファルト舗装体が白色を帯びた明色となる。このため、例えば、夏季の炎天下での日射を反射して、舗装体表面温度の上昇を抑制し、アスファルト舗装体の軟化によるわだち掘れを防止し、また、トンネル内などで安全性を高める目的で使用するのにも適している。さらに、磁器骨材は、電力碍子など本来の用途で使用済みのものをリサイクルできるため、廃棄性やコスト性に優れて、省資源かつ経済的であり、環境問題の面からも好ましく使用される。
【０００５】
しかしながら、磁器骨材は、アスファルトが剥離しやすく、すなわち、剥離抵抗性に劣るという問題点がある。従って、単独では道路舗装用の剥離基準を満たせず、接着力の強い高粘度バインダーをアスファルト舗装体に混合させたり、接着力の強い人造セラミック骨材を混合して剥離を抑えている。しかし、これらは、通常の舗装用原料より高価であることから、コストの点で問題がある。
【０００６】
【発明が解決しようとする課題】
本発明の目的は、剥離抵抗性に優れる磁器骨材を提供することである。
【０００７】
【課題を解決するための手段】
本発明者らは、上記目的を達成するため鋭意検討した結果、磁器骨材を高温で加熱処理することにより、剥離抵抗性が向上することを見出し、本発明を完成した。
【０００８】
すなわち、本発明は、９００〜１６００℃の温度範囲で、加熱処理してなることを特徴とする磁器骨材である。
【０００９】
【発明の実施の形態】
本発明において、磁器骨材とは、磁器製品の粉砕物であり、使用済みの電力用碍子、るつぼなどの磁器製品を粉砕するなどして用いることができ、また、食器、タイル、便器、舗装用骨材などのセラミック製品、シリカおよび／またはアルミナを主成分とする磁器骨材も含まれる。好ましくは、高い硬度と耐磨耗性を有するものがよい。特に好ましくは電力用碍子の粉砕物、シリカおよび／またはアルミナを主成分とする磁器骨材から選ばれる磁器骨材が好ましい。特に使用済みの電力用碍子を用いることにより、碍子の廃棄および骨材の原料調達の必要がなくなり、コスト性や環境性の点からも好ましい。なお、電力用碍子以外の磁器製品からなる磁器骨材を含有させることはもちろん可能である。
【００１０】
本発明の磁器骨材は、９００〜１６００℃の温度範囲で、加熱処理する。加熱温度が、９００℃未満であると剥離抵抗性の向上がみられず、１６００℃を超えると磁器骨材が溶融する。
【００１１】
本発明において、加熱処理の方法は特に限定されず、単一の加熱炉や複数の加熱炉等により回分式に加熱しても、トンネル炉などにより連続的において行ってもよい。電力用碍子など磁器製品の製造工程における焼成炉などで焼成工程に磁器骨材の加熱処理を併せて行うと、別個に設備を設置したり、加熱のための費用や手間が発生せず経済的である。なお、加熱処理は後述の実施例に準ずる方法で実施できる。
【００１２】
本発明において、加熱処理の処理時間は特に限定されず、処理対象の磁器骨材の種類にもよるが、好ましくは、９００〜１６００℃の温度範囲での加熱処理の処理時間が少なくとも１時間程度以上となるようにするのがよい。もちろん、予備加熱や冷却工程など上記温度範囲外での加熱処理が加わってもよい。
【００１３】
本発明の磁器骨材は、剥離抵抗性に優れるため、骨材とアスファルトとで主要部を構成したアスファルト舗装体の骨材成分として、好適に使用でき、本発明の磁器骨材を使用したアスファルト舗装体は、耐磨耗性などの耐久性に優れる。
【００１４】
上記アスファルト舗装体を構成するアスファルトの種類は特に限定されず、ストレートアスファルト、改質アスファルトＩＩ型、高粘度改質アスファルトなど挙げられるが、本発明の磁器骨材は剥離抵抗性に優れ、特に剥離しやすいストレートアスファルトを用いた場合でも、加熱処理をすることにより、剥離が軽減し、耐久性が向上するため、耐久性とコスト性のいずれも向上させることができる。
【００１５】
なお、上記アスファルト舗装体には、本発明の磁器骨材以外に、石粉、砂、砂利、砕石などの通常用いられる骨材を所定割合で含有させてもよく、さらに本発明の作用を阻害しない範囲で他の成分を含有させてもよい。
【００１６】
次に、試験例および実施例を用いて本発明を更に詳細に説明するが、本発明はこれらに限定されるものではない。
試験例
１．試験方法
（１）剥離抵抗性
舗装試験法便覧（社団法人日本道路協会 昭和６３年１１月）の粗骨材の剥離抵抗性試験方法（ＪＰＩ−５Ｓ−２７準拠）に準じて、下記の方法で行った。
金属製ビーカーに、溶融した舗装用石油アスファルト（日本道路協会規格 針入度６０〜８０）（５．５ｇ）を投入し、温度１５０℃とした。次いで、実施例１〜３及び比較例１の磁器骨材（１００ｇ）を投入し、へらで１．５分間混合し、磁器骨材を完全にアスファルトで被覆した。アスファルトで被覆した磁器骨材のうち２０個を、へらで取り出し、ガラス板上に重ならないように置き、室温まで放冷した。恒温水槽に、水を投入し、温度８０℃とした。次いで、水の中へ、上記で得られたアスファルトで被覆した磁器骨材を載せたガラス板を浸漬し、３０分間保持した後、このガラス板を水中から取り出し、室温の水が入った平らな容器に移した。平らな容器に移したガラス板上のアスファルトで被覆した磁器骨材について、水面上から観察し、表面のアスファルトの剥離している面積を目視で評価し、全表面積に対する割合を剥離面積率（％）として、平均値を算出した（ｎ＝２０）。
【００１７】
（２）耐候性
実施例４の磁器骨材について、ＪＩＳ Ｄ０２０５ １９８７ 自動車部品の耐候性試験方法の５．４ 促進耐候性試験（ＷＡＮ−１Ｓ）に準拠して、耐候性試験を、スガ試験機製のサンシャインカーボンアーク灯式耐候性試験機を用いて行った。加熱直後、上記耐候性試験の経過が３ヶ月後のサンプルについて剥離抵抗性を上記試験（１）と同様にして評価した。
【００１８】
上記試験結果を表１、２に示す。表１、２より明らかなように、実施例では、剥離抵抗性及びその耐候性が大きく向上していることが解る。
【００１９】
【実施例】
実施例１
使用済みの電力用碍子を粉砕機によって粉砕し、篩にかけて、篩の目開きで１３〜５ｍｍの大きさの碍子片を得た。該碍子片２００ｇを、電熱炉（二ケイ化モリブデン）によって１０００℃で５時間かけて加熱処理をおこなった。その後、空冷し、磁器骨材とした。
【００２０】
実施例２
加熱温度を１３００℃、加熱時間を３時間とした他は、実施例１と同様にして、磁器骨材を製造した。
【００２１】
実施例３
加熱温度を１５００℃、加熱時間を１時間とした他は、実施例１と同様にして、磁器骨材を製造した。
【００２２】
実施例４
実施例１と同様の碍子片を、電力用碍子の製造工程における焼成用のトンネル炉（ＬＮＧ燃料：常温から５４時間で１２８０℃まで上昇し、１２８０℃を７２分維持）によって加熱処理をおこなった。その後、空冷し、磁器骨材とした。
【００２３】
比較例１
使用済みの電力用碍子を粉砕機によって粉砕し、篩にかけて、篩の目開きで１３〜５ｍｍの大きさとした碍子片を、加熱処理を行わずに磁器骨材とした。
【００２４】
【発明の効果】
本発明によれば、剥離抵抗性およびその耐久性に優れた磁器骨材が得られ、単独でのアスファルト舗装体への使用が可能となり、コスト性が向上する。
【表１】
BACKGROUND OF THE INVENTION
The present invention relates to a porcelain aggregate used as an aggregate component of an asphalt pavement or the like, and more particularly to a porcelain aggregate with improved peel resistance.
[0002]
[Prior art]
Asphalt pavements for roads and the like constitute the main part of aggregate and asphalt. Conventionally, stone powder, sand, gravel, crushed stone and the like have been often used as aggregate components.
[0003]
Asphalt pavements wear as they are used. In particular, rutting occurs due to wear by tire chains in the winter, and rutting occurs due to softening of the asphalt pavement in the summer when the pavement surface temperature rises to about 60 ° C. Construction is required.
[0004]
In order to improve the wear resistance of the asphalt pavement, an asphalt pavement using porcelain aggregate as an aggregate component is provided. Since the porcelain aggregate has high hardness and wear resistance, when used as an aggregate, the wear resistance of the asphalt pavement is improved. In particular, porcelain aggregates recycled by pulverizing used power insulators are high-hardness and wear-resistant because the insulators for power are ceramics mainly composed of silica and alumina and baked at high temperature. Have. In addition, when white porcelain such as a power insulator is exposed on the surface of the asphalt, the asphalt pavement has a light white color. For this reason, for example, by reflecting sunlight in the hot weather in the summer to suppress the rise in the surface temperature of the pavement, to prevent rutting due to softening of the asphalt pavement, and to improve safety in tunnels, etc. Also suitable for use. Furthermore, since the porcelain aggregates can be recycled for their original use such as electric insulators, they are excellent in disposal and cost, are resource-saving and economical, and are preferably used from the viewpoint of environmental problems. .
[0005]
However, the porcelain aggregate has a problem that asphalt is easily peeled off, that is, has poor peeling resistance. Therefore, the separation standard for road pavement alone is not satisfied, and a high-viscosity binder having a strong adhesive force is mixed with an asphalt pavement or an artificial ceramic aggregate having a strong adhesive force is mixed to suppress separation. However, since these are more expensive than ordinary pavement materials, there is a problem in terms of cost.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a porcelain aggregate excellent in peeling resistance.
[0007]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present inventors have found that the peel resistance is improved by heat-treating the porcelain aggregate at a high temperature, thereby completing the present invention.
[0008]
That is, the present invention is a porcelain aggregate that is heat-treated in a temperature range of 900 to 1600 ° C.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, the porcelain aggregate is a pulverized product of porcelain products, and can be used by pulverizing used porcelain products such as insulators for electric power and crucibles. Also included are ceramic products, such as aggregates, and porcelain aggregates based on silica and / or alumina. Preferably, those having high hardness and wear resistance are preferred. Particularly preferred is a porcelain aggregate selected from pulverized power insulators and a porcelain aggregate mainly composed of silica and / or alumina. In particular, the use of used electric power insulators eliminates the need to discard the insulators and procure aggregate raw materials, which is preferable from the viewpoint of cost and environment. Of course, it is possible to include porcelain aggregates made of porcelain products other than power insulators.
[0010]
The porcelain aggregate of the present invention is heat-treated in a temperature range of 900 to 1600 ° C. When the heating temperature is less than 900 ° C., no improvement in peeling resistance is observed, and when it exceeds 1600 ° C., the porcelain aggregate is melted.
[0011]
In the present invention, the heat treatment method is not particularly limited, and the heat treatment may be performed batchwise in a single heating furnace or a plurality of heating furnaces, or continuously in a tunnel furnace or the like. It is economical to install a separate facility and to avoid the expense and labor of heating when performing the heat treatment of porcelain aggregate in the firing process in a firing furnace in the production process of porcelain products such as electric insulators. It is. In addition, heat processing can be implemented by the method according to the below-mentioned Example.
[0012]
In the present invention, the treatment time of the heat treatment is not particularly limited, and although it depends on the type of porcelain aggregate to be treated, preferably the treatment time of the heat treatment in the temperature range of 900 to 1600 ° C. is at least about 1 hour. It is good to make it above. Of course, heat treatment outside the above temperature range such as preheating or cooling step may be added.
[0013]
Since the porcelain aggregate of the present invention is excellent in peeling resistance, it can be suitably used as an aggregate component of an asphalt pavement composed mainly of aggregate and asphalt. Asphalt using the porcelain aggregate of the present invention The pavement is excellent in durability such as wear resistance.
[0014]
The type of asphalt constituting the asphalt pavement is not particularly limited, and examples include straight asphalt, modified asphalt type II, high viscosity modified asphalt, etc., but the porcelain aggregate of the present invention is excellent in peeling resistance, particularly peeling. Even when straight asphalt that is easy to do is used, the heat treatment reduces peeling and improves durability, so that both durability and cost can be improved.
[0015]
In addition to the porcelain aggregate of the present invention, the asphalt pavement may contain a commonly used aggregate such as stone powder, sand, gravel, and crushed stone in a predetermined ratio, and does not hinder the operation of the present invention. You may contain another component in the range.
[0016]
Next, the present invention will be described in more detail using test examples and examples, but the present invention is not limited to these examples.
Test Example 1 Test method (1) Peeling resistance pavement test method manual (Japan Road Association, November 1988) according to the peeling resistance test method (based on JPI-5S-27) of coarse aggregates by the following method went.
Molten pavement petroleum asphalt (Japan Road Association standard penetration 60-80) (5.5 g) was introduced into a metal beaker, and the temperature was adjusted to 150 ° C. Next, the porcelain aggregates (100 g) of Examples 1 to 3 and Comparative Example 1 were added and mixed for 1.5 minutes with a spatula to completely coat the porcelain aggregate with asphalt. 20 pieces of porcelain aggregate covered with asphalt were taken out with a spatula, placed on a glass plate so as not to overlap, and allowed to cool to room temperature. Water was introduced into a constant temperature water bath to a temperature of 80 ° C. Next, the glass plate on which the porcelain aggregate coated with asphalt obtained above was immersed in water and held for 30 minutes, and then the glass plate was taken out of the water and flattened with room temperature water. Transferred to a container. For porcelain aggregate coated with asphalt on a glass plate transferred to a flat container, observe from above the water surface, visually evaluate the peeled area of the asphalt on the surface, and the ratio to the total surface area is the peeled area ratio (% ), An average value was calculated (n = 20).
[0017]
(2) Weather resistance With respect to the porcelain aggregate of Example 4, the weather resistance test was made according to JIS D0205 1987, the weather resistance test method for automobile parts, 5.4 Accelerated weather resistance test (WAN-1S). The sunshine carbon arc lamp type weather resistance tester was used. Immediately after heating, the peel resistance was evaluated in the same manner as in the above test (1) for the sample after 3 months of the weather resistance test.
[0018]
The test results are shown in Tables 1 and 2. As is clear from Tables 1 and 2, it can be seen that in the examples, the peel resistance and its weather resistance are greatly improved.
[0019]
【Example】
Example 1
The used electric power insulator was pulverized by a pulverizer and passed through a sieve to obtain an insulator piece having a size of 13 to 5 mm with a sieve opening. 200 g of the insulator pieces were heat-treated at 1000 ° C. for 5 hours in an electric furnace (molybdenum disilicide). Then, it air-cooled and set it as the porcelain aggregate.
[0020]
Example 2
A porcelain aggregate was produced in the same manner as in Example 1 except that the heating temperature was 1300 ° C. and the heating time was 3 hours.
[0021]
Example 3
A porcelain aggregate was produced in the same manner as in Example 1 except that the heating temperature was 1500 ° C. and the heating time was 1 hour.
[0022]
Example 4
The insulator piece similar to that of Example 1 was subjected to a heat treatment in a firing tunnel furnace (LNG fuel: rising from normal temperature to 1280 ° C. in 54 hours and maintaining 1280 ° C. for 72 minutes) in the manufacturing process of the electric insulator. . Then, it air-cooled and set it as the porcelain aggregate.
[0023]
Comparative Example 1
The used electric power insulator was pulverized by a pulverizer, passed through a sieve, and an insulator piece having a size of 13 to 5 mm with an opening of the sieve was used as a porcelain aggregate without heat treatment.
[0024]
【The invention's effect】
According to the present invention, a porcelain aggregate excellent in peeling resistance and durability can be obtained, and it can be used for an asphalt pavement alone, thereby improving cost.
[Table 1]
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001087054A JP4701349B2 (en) | 2001-03-26 | 2001-03-26 | Heat treatment of porcelain aggregate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001087054A JP4701349B2 (en) | 2001-03-26 | 2001-03-26 | Heat treatment of porcelain aggregate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002284553A JP2002284553A (en) | 2002-10-03 |
| JP4701349B2 true JP4701349B2 (en) | 2011-06-15 |
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| JP2001087054A Expired - Lifetime JP4701349B2 (en) | 2001-03-26 | 2001-03-26 | Heat treatment of porcelain aggregate |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7140778B2 (en) | 2002-03-01 | 2006-11-28 | Minebea Co., Ltd. | Synthetic resin composites and bearings formed therefrom and method |
| JP4116333B2 (en) | 2002-06-05 | 2008-07-09 | ミネベア株式会社 | Super finishing whetstone |
| JP2004019368A (en) | 2002-06-19 | 2004-01-22 | Minebea Co Ltd | Road paving material |
| JP2004211851A (en) | 2003-01-07 | 2004-07-29 | Minebea Co Ltd | Dynamic pressure bearing device forming oil repellent film thereto and spindle motor for hard disk drive mounting the same |
| JP6404093B2 (en) * | 2014-11-14 | 2018-10-10 | 株式会社名倉ルーフ | Anti-slip coating material and anti-slip construction method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6278135A (en) * | 1985-09-30 | 1987-04-10 | 株式会社 カネキ製陶所 | Manufacture of artificial bone material |
| JPH07126058A (en) * | 1993-10-29 | 1995-05-16 | Taisei Corp | High-strength, heat-resistant concrete |
| JPH07291688A (en) * | 1994-04-26 | 1995-11-07 | Naigai Ceramics Kk | Artificial aggregate for road paving |
| JP3074241B2 (en) * | 1994-09-07 | 2000-08-07 | 内外セラミックス株式会社 | Method for producing sintered artificial aggregate for roads |
| JP3074242B2 (en) * | 1994-09-08 | 2000-08-07 | 内外セラミックス株式会社 | Sintered artificial aggregate for road pavement and method for producing the same |
| JPH1095647A (en) * | 1995-12-28 | 1998-04-14 | Toray Ind Inc | Ceramic aggregate, its production and pavement structure |
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