Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures over time. Concrete is the second-most-used substance in the world after water, and is the most widely used building material. Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined.
A cement is a binder, a chemical substance used for construction that sets, hardens, and adheres to other materials to bind them together. Cement is seldom used on its own, but rather to bind sand and gravel (aggregate) together. Cement mixed with fine aggregate produces mortar for masonry, or with sand and gravel, produces concrete. Concrete is the most widely used material in existence and is behind only water as the planet's most-consumed resource.
Slag is a by-product of smelting (pyrometallurgical) ores and recycled metals. Slag is mainly a mixture of metal oxides and silicon dioxide. Broadly, it can be classified as ferrous, ferroalloy or non-ferrous/base metals. Within these general categories, slags can be further categorized by their precursor and processing conditions.
Tosoh Corporation is a global chemical and specialty materials company. The company was founded in 1935 in Yamaguchi Prefecture, as Toyo Soda Manufacturing Co., Ltd., and in 1987 changed its name to Tosoh Corporation. Today, its corporate headquarters are in Tokyo, Japan.
Hyundai Department Store (Korean: 현대백화점) is a major department store chain in South Korea. Its parent company is the Hyundai Department Store Group. It, Lotte Department Store, and Shinsegae are the three largest chains in the country.
E·Land Group (Korean: 이랜드그룹) is a South Korean conglomerate headquartered in Changjeon-dong Mapo-gu Seoul, South Korea. E-Land Group takes part in retail malls, restaurants, theme parks, hotels, and construction businesses as well as its cornerstone, fashion apparel business. It has operations worldwide through its subsidiary E-Land World.
Asia Cement Co. Ltd. (아세아시멘트) is South Korea's cement, concrete, and chemical company headquartered in Seoul, Korea. Established in 1957, the company primarily produces remicon and portland cement. Asia Cement Co., Ltd. is one of the three largest cement manufacturing companies in Korea.
Sampyo Cement is a South Korean cement, concrete and chemical company headquartered in Seoul. It produces portland cement products. It was established in 1957 as Tong Yang Cement by Lee Yang-gu as the second of his many companies which would grow into the Tongyang Group, and was also later known as Tongyang Cement and Energy.
Yuseong District (Yuseong-gu) is a gu ("district") of Daejeon, South Korea, known for high tech industries, Daejeon Expo '93, Daedeok Science Town and the Yuseong Special Tourism District. Daejeon Islamic Center is also located in Kung-dong, Yuseong-gu. The Science Town is the core of the International Science and Business Belt.
Ground granulated blast-furnace slag is obtained by quenching molten iron slag from a blast furnace in water or steam, to produce a glassy, granular product that is then dried and ground into a fine powder. Ground granulated blast furnace slag is a latent hydraulic binder forming calcium silicate hydrates (C-S-H) after contact with water. It is a strength-enhancing compound improving the durability of concrete. It is a component of metallurgic cement. Its main advantage is its slow release of hydration heat, allowing limitation of the temperature increase in massive concrete components and structures during cement setting and concrete curing, or to cast concrete during hot summer.
SM Bexel Co, Ltd. is a South Korean chemical company specializing in battery manufacture. It is headquartered in Yangpyeong-dong Yeongdeungpo-gu, Seoul and Gongdan-dong, Gumi, Gyeongsangbuk-do, South Korea. Founded in 1978, it also manufactures other electronic products. Manufacturing is based in Gumi, Gyeongsangbuk-do.
Korea Cement Co, Ltd. (Korean: 고려시멘트) is a South Korean cement and chemical company, headquartered in Sinan-dong Buk-gu Gwangju, Korea. established in 1962. It is a manufacturer of cement products, and is under the Gangdong Group family. The CEO of Korea Cement is Lee Kuk No (이국노).
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world. Aggregates are a component of composite materials such as concrete and asphalt; the aggregate serves as reinforcement to add strength to the overall composite material. Due to the relatively high hydraulic conductivity value as compared to most soils, aggregates are widely used in drainage applications such as foundation and French drains, septic drain fields, retaining wall drains, and roadside edge drains. Aggregates are also used as base material under foundations, roads, and railroads. In other words, aggregates are used as a stable foundation or road/rail base with predictable, uniform properties, or as a low-cost extender that binds with more expensive cement or asphalt to form concrete. Although most kinds of aggregate require a form of binding agent, there are types of self-binding aggregate which require no form of binding agent.
Guro District (Guro-gu) is a district of Seoul, South Korea, which was separated from Yeongdeungpo District on April 1, 1980. Located in the southwestern part of the city, where besides Yangcheon District and Geumcheon District Guro District has an important position as a transport link which contains railroads, land routes from the rest of Seoul to the south of the country. The Gyeongbu and Gyeongin railway lines connect Seoul to Busan and Incheon. In addition, Seoul Metropolitan Subway lines 1, 2, and 7, and major highways intersect in Guro District.
Jung District is one of the 25 districts of Seoul, South Korea.
Gangseo District (Gangseo-gu) is one of the 25 wards (gu) of Seoul, South Korea. It is located on the south side of the Han River. Gimpo Airport is in Gonghang-dong, where many flights fly to cities like Busan, Jeju, and Gwangju.
Hyundai Amco Co. Ltd. (Korean: 엠코건설), was a Korean construction company founded in October 2002 in Yangjae-dong Seocho-gu Seoul, South Korea. Currently, the company's CEO is Kim Chang Hee. AMCO is licensed by the Hyundai Motor Company, and its main line of business is construction products. The company researches new technologies such as the modularization method, and floating dock technology.
Crushed stone or angular rock is a form of construction aggregate, typically produced by mining a suitable rock deposit and breaking the removed rock down to the desired size using crushers. It is distinct from naturally occurring gravel, which is produced by natural processes of weathering and erosion and typically has a more rounded shape.
In 2006, Cambodia's mineral resources remained, to a large extent, unexplored. Between 2003 and 2006, however, foreign investors from Australia, China, South Korea, Thailand, and the United States began to express their interest in Cambodia's potential for offshore oil and gas as well as such land-based metallic minerals as bauxite, copper, gold, and iron ore, and such industrial minerals as gemstones and limestone.
Copper slag is a by-product of copper extraction by smelting. During smelting, impurities become slag which floats on the molten metal. Slag that is quenched in water produces angular granules which are disposed of as waste or utilized as discussed below.
