KR100763811B1 - Manufacturing method of uncolored aggregate for non-slip road construction - Google Patents
Manufacturing method of uncolored aggregate for non-slip road construction Download PDFInfo
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- KR100763811B1 KR100763811B1 KR1020060063814A KR20060063814A KR100763811B1 KR 100763811 B1 KR100763811 B1 KR 100763811B1 KR 1020060063814 A KR1020060063814 A KR 1020060063814A KR 20060063814 A KR20060063814 A KR 20060063814A KR 100763811 B1 KR100763811 B1 KR 100763811B1
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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
- 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
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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
- 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
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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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
- 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
- C04B20/02—Treatment
- C04B20/04—Heat treatment
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00362—Friction materials, e.g. used as brake linings, anti-skid materials
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Abstract
산화철이 다량 함유되어 있고 황갈색을 띄는 황토에, 상기 황토에 대하여, 백색이나 유백색의 가소성이 있는 카올린 분말 20~30wt%와 장석분말 30~40wt%를 첨가하고 거기에 흑동색의 산화망간(MnO2)이나 적갈색의 산화철(Fe2O3)중에서 선택된 어느 한가지를 5~15wt% 첨가한 다음, 함수율이 15~25wt%가 되도록 수분을 첨가하여 진공 토련기로 잘이긴 후, 직경 5~10㎝크기의 구형(球形)이나 각형으로 성형한 다음, 1300~1500℃의 고온 가열소성로에서 2~3시간동안 가열 소성하여 적색이나 적갈색 또는 검정색의 소성된 성형물을 얻고 그 얻어진 소성물을 분쇄기에서 분쇄하여 직경이나 길이가 3~15㎜크기의 도로 미끄럼방지 로면 시공용 불변색 골재를 얻는다.To yellow clay, which contains a large amount of iron oxide, 20 to 30 wt% of kaolin powder having white or milky plasticity and 30 to 40 wt% of feldspar powder are added to the yellow soil, and black copper manganese oxide (MnO 2) is added thereto. 5-15 wt% of any one selected from iron or red-brown iron oxide (Fe 2 O 3 ), and then add water so that the water content is 15-25 wt%, and then fine with a vacuum grinder, and have a diameter of 5-10 cm. After being molded into a sphere or a square, it is heated and calcined for 2 to 3 hours in a high temperature heating furnace at 1300 to 1500 ° C. to obtain a red, reddish brown or black calcined molding, and the resulting calcined product is pulverized in a grinder to The colorless aggregate for the construction of non-slip road surface with the length of 3 ~ 15㎜ is obtained.
Description
본 발명은 미끄럼방지 로면 시공용 불변색 골재의 제조방법에 관한 것으로서, 특히 경사진 도로나 구부러진 도로에서의 차량의 미끄럼을 방지하기 위해 로면상에 요철 노면을 시공하기 위한 골재로서 탈색되거나 변색되지 않는 골재를 제조하는 방법에 관한 것이다.The present invention relates to a method for producing non-slip aggregate for non-slip road surface construction, in particular, aggregates that do not discolor or discolor as aggregate for construction of uneven road surface on the road surface in order to prevent slipping of the vehicle on a sloped road or a curved road. It relates to a method of manufacturing.
일반적으로 미끄럼 방지용 요철 로면 시공을 위해 사용되는 골재로는 슬래그나 규사 또는 자갈등을 사용하되 다양한 색상을 내기 위하여 그 사용하고져 하는 골재인 슬래그, 규사 또는 자갈등을 각종 색상의 유색페인트나 각종 합성수지 에멀죤으로 도포하거나 그 골재들로 먼저 로면에 시공한 후 그 위에 각종 페인트나 합성수지 에멀죤을 도포하는 방법으로 시공한 예가 있었으나 상기와 같은 경우에는 어느 것이나 골재의 표면에만 유색페인트나 합성수지 에멀죤이 도포되게 되므로 그 로면 위로 지나다니는 사람이나 차량 및 중장비등에 의해 마모되면서 도포된 페인트층 또는 합성수지층이 쉽게 벗겨지게 되므로 원래의 색상 유지가 어렵고 오히려 불균일하게 탈색이 되어 균일한 색상유지가 어렵게 되므로 외관상 보기 흉해 지기도 하며, 또한 사람이나 차량 출입이 빈번하지 않은 곳이라 할지라도 겨울철이나 하절기의 극심한 기후변화와 온도변화 및 태양 자외선의 영향등으로 인하여 색상이 자연히 변하거나 탈색되게 되며, 특히 골재의 색상중에서 흔히 사용되는 붉은 색은 태양광선중 자외선에 의해 쉽게 탈색되게 되므로 나중에는 거의 붉은 색을 잃고 백색이나 기타 골재 본래의 원색으로 변하는 문제점이 있었다.In general, the aggregate used for the construction of the non-slip uneven road surface uses slag, silica sand or gravel, but the slag, silica sand or gravel, which is the aggregate that is used to produce various colors, onto colored paint or various synthetic resins of various colors. There was an example of applying by mullion or by applying the aggregate on the surface of the furnace first and then applying various paint or resin emulsion zone on it. In the above cases, either colored paint or resin emulsion was applied only to the surface of aggregate. Since the paint layer or synthetic resin layer is easily peeled off as it is worn by people walking on the road, vehicles, and heavy equipment, it is difficult to maintain the original color and rather unevenly discolored, making it difficult to maintain uniform color. Build and buy Even in places where people are not frequently accessing cars or vehicles, the color changes or discolors naturally due to extreme weather changes in winter or summer, temperature changes and sun ultraviolet rays. Especially, red color commonly used in aggregate color is Since it is easily discolored by ultraviolet rays in the sun, there is a problem that later loses almost red color and changes to the original primary color of white or other aggregates.
본 발명은 상기한 바와 같은 종래 미끄럼방지 로면 시공용 유색 골재의 결점을 개선하여 그 골재 자체가 통상적으로 가장 많이 사용되는 붉은 색이거나 적갈색 또는 검은 색이 되도록 골재를 제조하되, 일반적으로는 고형의 미끄럼방지 요철 로면 시공용 골재를 만들 수 없는 황토를 주재로하여 원료에서부터 골재가 완성될 때까지의 제조공정에 의해 골재 내외가 완전 붉은 색(적색)이거나, 적갈색 또는 검정색에 가까운 색상으로 형성되어 그 골재를 분쇄 또는 마쇄하거나 강열한 태양 아래에서 장기간 노출시키고 혹독한 기후 변화와 냉온의 온도차이에 접하게 하드라도 골재 자체의 고유한 색상이 변하거나 탈색될 수 없는 미끄럼방지 로면 시공용 불변색의 골재를 제조하는 방법을 제공코저하는 것으로서, 이를 실례를 들어 상세히 설명하면 다음과 같다.The present invention improves the defects of the conventional non-slip road surface construction aggregates as described above, but the aggregates are manufactured so that the aggregates are red, reddish brown, or black, which are usually most commonly used, but are generally solid slip Preventing uneven road surface The aggregate is mainly reddish red (red) or reddish brown or black color by the manufacturing process from raw material to the completion of the aggregate, mainly based on ocher which cannot make aggregate. To produce non-slip surface-integrated aggregates for non-slip surface construction that cannot be changed or discolored even if they are hard to be exposed to prolonged exposure to severe weather changes and cold temperatures, or to be exposed to prolonged exposure under intense sun. As an example, it is described in detail as follows. same.
산화철이 다량 함유되어 있고 황갈색을 띄는 황토분말을 주재료로 하여, 상기 황토에 대하여, 백색이나 유백색의 가소성이 있는 카올린 분말 20~30wt%와 규소 나 알루미늄 성분이 함유된 장석분말 30~40wt%를 첨가하고, 거기에 흑동색(黑銅色)의 산화망간(MnO2)이나 적갈색의 산화철(Fe2O3)중에서 선택된 어느 한가지를 5~15wt% 첨가한 다음, 함수율이 15~25wt%가 되도록 수분을 첨가하여 진공 토련기(土練器)로 잘이긴 후, 직경 5~10㎝크기의 구형(球形)이나 각형으로 성형한 다음, 1300~1500℃의 고온 가열소성로에서 2~3시간동안 가열 소성하여 적색이나 적갈색 또는 검정색의 소성된 성형물을 얻고, 그 얻어진 소성물을 분쇄기에서 분쇄하여 직경이나 길이가 3~15㎜크기의 미끄럼방지 로면 시공용 불변색 골재 입자를 얻는다.The main material is ocher powder containing a large amount of iron oxide and yellowish brown color, and 20 to 30 wt% of kaolin powder having white or milky plasticity and 30 to 40 wt% of feldspar powder containing silicon or aluminum are added to the loess. 5-15 wt% of any one selected from black copper manganese oxide (MnO 2 ) or reddish brown iron oxide (Fe 2 O 3 ) is added thereto, and the moisture content is 15-25 wt%. After the addition, it was beaten with a vacuum grinder, and then formed into a sphere or a square having a diameter of 5 to 10 cm and then heated and calcined for 2 to 3 hours in a high temperature heating furnace at 1300 to 1500 ° C. To obtain a fired molded product of red, reddish brown, or black color, and the fired product is pulverized in a pulverizer to obtain non-colored aggregate particles for non-slip furnace surface construction having a diameter or length of 3 to 15 mm.
상기에서 사용한 주재료인 황토분말은 원래 점결력이 적기 때문에 어떤 형태로 성형한 후 고열의 소성로에서 소성하게 되면 성형물이 파쇄되어 일정형태의 소성이 어렵고 따라서 일정 규격의 골재 입자를 얻기가 어려운 결점이 있었으나 본원에서는 이를 주재료로하여 점결력이 있는 카올린을 첨가하여 상기한 바와 같은 각종 첨가물질과 함께 혼합하여 불변색의 미끄럼방지 로면 시공용 불변색 골재를 제조하는 것이 특징으로서 그 작용효과를 설명하면 다음과 같다.Ocher powder, which is the main material used in the above, originally had low point cohesion, and when it was molded in a certain form and then fired in a high-temperature firing furnace, the molded product was crushed, and thus it was difficult to obtain a certain type of aggregate particles. In the present application, as the main material is added to the kaolin having a caking force and mixed with the various additives as described above to produce a non-colored non-slip surface-unchanging aggregate for the construction of a non-colored aggregate as described below.
상기에서 얻어진 본 발명의 황토분말을 이용한 미끄럼방지 로면 시공용 불변색 골재는 표면에 어떤 유색 페인트나 합성수지 에멀죤과 같은 유색코팅제를 코팅한 것이 아니라 골재 자체의 내외가 모두 적색이나 적갈색 또는 검정색에 가까운 색상으로 이루어져있기 때문에 변색되거나 변질되지 않는 특징이 있다.The non-slip aggregate for non-slip surface construction using the ocher powder of the present invention obtained above is not coated with a colored coating agent such as colored paint or synthetic resin emulsion on the surface, but the color of the aggregate itself is almost red, reddish brown or black. Because it consists of features that do not discolor or deteriorate.
이는 골재 성분 전체가 적색이거나 적갈색 또는 검정색에 가깝게 형성되어 있기 때문이며 따라서 자외선에 의해 탈색되거나 노화되거나 변색되는 일이 없고 어떤 물체의 접촉이나 타격에 의해서 마모되거나 파손되드라도 항상 원래의 색상을 유지할 수 있는 것이다.This is because the entire aggregate component is red, reddish brown, or black, which is why it is not discolored, aged or discolored by ultraviolet rays and can always maintain its original color even if worn or broken by contact or striking of an object. will be.
상기한 본원 발명의 미끄럼방지 로면 시공용 골재가 변하지 않는 적색이나 적갈색 또는 검정색중 어느 한가지 색을 띄게 되는 것은 본원 골재의 주재료는 산화철이 내포되어 있는 황적색을 띄는 황토이지만 그 황토가 1300~1500℃의 고온소성에 의해서 그 속에 내포된 산화철성분에 의해 약간 적색으로 변하는데다가 거기에 점결력과 가소성을 부여하기 위해 첨가된 카올린에 다량 포함된 산화철과, 별도로 첨가한 적갈색의 산화철이나 흑동색의 산화망간이 황토에 골고루 섞여 있다가 1300~1500℃의 고온에서 소성하게 되면 모두 적색이나 적갈색 또는 흑색(검정색)으로 변하면서 주재료인 황토를 적색이나 적갈색 또는 검정색으로 변화시키기 때문이며, 여기에서 온도를 상기 가열 소성온도인 1300~1500℃의 범위내에서 낮은 온도로 단시간에 가열 소성하게 되면 적색이 되거나, 좀더 높은 온도로 좀더 긴시간 소성하게 되면 적갈색이 되고 더 높은 온도로 장시간 가열하게 되면 검정색에 가까워지게 되는 것이다.The non-slip road surface construction aggregate of the present invention is one of red, reddish brown, or black color that does not change is the main material of the aggregate of the present application is yellow-red loess containing iron oxide but the loess is 1300 ~ 1500 ℃ Iron oxide contained in a large amount in kaolin added to give point cohesion and plasticity, and reddish brown iron oxide or black copper manganese oxide added separately. When evenly mixed with ocher and then fired at a high temperature of 1300-1500 ° C., all of them turn red, reddish brown, or black (black) and change the main material ocher to red, reddish brown, or black. It is heated and baked at low temperature in the range of 1300-1500 degrees Celsius for a short time If the red or, when the longer the firing time to a higher temperature at which the red-brown, and when further heated to a temperature for a long time that will be closer to black.
이는 소성로의 소성온도와 가열시간에 따라 색상이 다양하게 달라지기 때문이며 따라서 필요로 하는 색상의 골재를 얻고져 할때는 가열 소성온도와 시간을 조절하면 된다.This is because the color varies depending on the firing temperature and the heating time of the kiln. Therefore, when the aggregate of the required color is obtained, the heating firing temperature and time may be adjusted.
상기에서 카올린은 주재료인 황토분말에 대하여 20~30wt%를 첨가하는 것이 황토분말, 장석분말, 산화철이나 산화망간등의 본 발명 조성 혼합물로 일정형태의 성형물을 만들기에 가장 알맞는 점결력이 부여되고 그 이하에서는 장석과 황토의 점결력이 저하되어 성형력이 떨어지게 되며 그 이상에서는 너무 점결력이 강하여 역시 성형력이 저하되게 된다. 상기에서 장석분말은 규사와 알루미늄이 함유되어 있어서 황토를 주재료로한 골재에 강도를 부여하면서 결착력을 부여하기 위한 것으로서 그 첨가량은 주재료인 황토량에 대하여 30~40wt%로 첨가하는 것이 성형성이 좋고 강도도 좋으며, 성형, 소성후 입자로 파쇄시에 파쇄성도 좋으나, 그 이하에서는 소성물이나 그것을 파쇄한 입자의 강도가 약하여 골재가 미분되므로 강도높은 골재로서의 역할이 어렵고 그 이상에서는 강도는 좋아지지만 황토와 카올린 및 기타 부재료의 양이 상대적으로 줄어들어 골재의 색상이 균일치 못하거나 적색이나 적갈색 또는 검정색이 아닌 적황색 내지는 황색을 띌 수도 있는 결점이 있게 된다.In the above kaolin is added to 20 ~ 30wt% with respect to the main material ocher powder is given the coking force which is most suitable for making a certain type of molding with the composition mixture of the present invention, such as ocher powder, feldspar powder, iron oxide or manganese oxide, Below that, the coking force of feldspar and loess is lowered and the molding force is lowered. Above that, the coking force is too strong and the molding force is also lowered. Since the feldspar powder contains silica sand and aluminum, it imparts strength to aggregates made of loess as the main material and imparts binding strength. The addition amount is 30 ~ 40wt% with respect to the amount of loess which is the main material. It has good strength and good crushing property when crushed into particles after molding and firing, but less than that of aggregates and crushed particles, the aggregate is finely divided, so it is difficult to act as a high-strength aggregate. Relatively reduced amounts of and kaolin and other subsidiary materials present defects that may result in uneven color of the aggregates or may be reddish-yellow to yellow rather than red, reddish-brown, or black.
흑동색의 산화망간은 그 색상이 검은 구리색이고 산화철은 적갈색인데다가 1300~1500℃의 고온에서는 가열온도와 가열 소성시간에 따라 적색, 적갈색, 또는 검정색으로 변하게 되므로 골재를 속에서부터 겉에 이르기까지 전체적으로 적색이나 적갈색 또는 검정색을 나타내게 하므로서 이것을 혼합하여 제조한 골재는 시공후에도 절대로 변질 또는 변색되거나 탈색되지 않게 되는데 이때 산화망간이나 산화철의 첨가량은, 주재료인 황토분말에 대하여 5~15wt%를 첨가하는 것이 가장 바람직하고 그 이하에서는 골재의 색상이 적색이나 적갈색에도 이르지 못하고 황색 또는 적황색이 되어 색상이 미려하지 못한 점이 있게 되고, 그 이상에서는 골재의 색상이 모두 검정색으로 착색되기는 하지만 과량이어서 다른 성분의 점결력을 저하시키는 결점이 있으며, 함수률은 황토분말량에 대하여 15~25wt%로 하는 것이 토련기에서 이겨서 성형하기에 가장 알맞은 수준이 되고 그 이하에서는 수분함량이 약하 여 골고루 이겨지지 않는데다가 결착력이 약하여 성형이 잘되지 않게 되며 그 이상에서는 과량이어서 배합물이 흘러내려 역시 성형이 약한 결점이 있게 된다.Manganese oxide of black copper color is black copper color and iron oxide is reddish brown, and at high temperature of 1300 ~ 1500 ℃, it turns red, reddish brown, or black depending on heating temperature and heating firing time. Aggregate prepared by mixing red, reddish brown, or black so that it never changes, discolored or discolored even after construction.In this case, the amount of manganese oxide or iron oxide added is 5 ~ 15wt% with respect to the main material ocher powder. It is preferable that the color of aggregate is less than red or reddish brown and becomes yellow or reddish yellow, and the color is not beautiful. Defects that degrade The yield is 15 ~ 25wt% with respect to the ocher powder, which is the most suitable level for forming by winning in the refining machine, and below that, the moisture content is weak, so it is not evenly beaten and the binding strength is weak so that the molding is not good. In the excess, the formulation flows down, which also results in weak molding.
성형물의 크기는 직경이 5~10㎝인 것이 소성후 입자로 성형하기에 가장 알맞고 그 이하에서는 너무 적어서 작은 입자로 파쇄기(크러셔)로 파쇄하기가 어렵고 그 이상에서는 너무 커서 파쇄기에서 파쇄가 역시 어려운 결점이 있었다.Moldings of 5 to 10 cm in diameter are most suitable for molding into particles after firing and are too small below them, making it difficult to break them into crushers (crushers) with small particles. There was this.
성형물을 1300~1500℃의 고온과 2~3시간의 시간동안 소성로에서 소성하는 것은 그 이하의 온도나 시간에서는 카올린중의 산화철이나 산화망간, 산화철등이 적색이나 적갈색 또는 검정색으로 변하기 어렵고 그 이상의 온도와 시간에서는 모두 흑색(검정색)으로 변하여 자유로운 색상 선택이 어려울 뿐 아니라 잘못하면 과열에 의해 성형물 자체가 열에 의해 파쇄되는 결점도 있게 된다.Firing of the moldings in a kiln at a high temperature of 1300-1500 ° C. for a period of 2 to 3 hours is difficult for iron oxide, manganese oxide, iron oxide, etc. in kaolin to turn red, reddish brown, or black at a lower temperature or time. In both time and time, the color turns black (black), making free color selection difficult, and inadvertently there is a drawback that the molding itself is thermally broken by overheating.
파쇄된 입자의 크기는 3~15㎜가 골재 시공시에 다양하게 적용할 수 있는 가장 적합한 크기이고 그 이하에서는 너무 미세하여 골재를 로면 시공시에 골고루 뿌리기가 어려우며 그 이상의 크기는 너무 커서 역시 골고루 로면에 분포되도록 시공하기가 어려운 결점이 있게 된다.The size of the crushed particles is the most suitable size that can be variously applied in the construction of the aggregate, and it is too fine below that it is difficult to spread the aggregate even when the surface of the aggregate is applied. There are drawbacks that are difficult to construct such that
이상과 같은 본 발명 불변색의 미끄럼방지 로면 시공용 불변색 골재는 냉, 온의 온도변화, 기후변화 및 태양열이나 빛에 의해서 절대로 변색, 변질되지 않을 뿐 아니라 사람이나 차량등이 지나다니는 동안 마모되거나 파쇄되드라도 항상 같은 색상을 지니게 되는 효과를 얻게 된다.As described above, the invariant aggregate for non-slip road surface construction of the invariant color of the present invention is not discolored or deteriorated by cold or hot temperature change, climate change and solar heat or light, but also worn or crushed while a person or a vehicle passes by. Even if you always get the same color effect.
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| KR970021522A (en) * | 1995-10-10 | 1997-05-28 | 한정국 | Artificial aggregate and its paving method for preventing slippage on pavement |
| KR20000049395A (en) * | 2000-02-11 | 2000-08-05 | 안호성 | A composition of clay pavement and process thereof |
| KR20020023799A (en) * | 2001-12-19 | 2002-03-29 | 민병억 | Construction material composition using foundry waste sand and method of producing construction material using the composition |
| KR20040016322A (en) * | 2002-08-16 | 2004-02-21 | 미래화학 주식회사 | Aggregate and method for manufacturing the same and powder made of the same |
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| KR970021522A (en) * | 1995-10-10 | 1997-05-28 | 한정국 | Artificial aggregate and its paving method for preventing slippage on pavement |
| KR20000049395A (en) * | 2000-02-11 | 2000-08-05 | 안호성 | A composition of clay pavement and process thereof |
| KR20020023799A (en) * | 2001-12-19 | 2002-03-29 | 민병억 | Construction material composition using foundry waste sand and method of producing construction material using the composition |
| KR20040016322A (en) * | 2002-08-16 | 2004-02-21 | 미래화학 주식회사 | Aggregate and method for manufacturing the same and powder made of the same |
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