Slag brick

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Slag bricks are a building material made of slag left over from blast furnaces. In modern times, "slag brick is made by mixing, watering, grinding and pressing slag and limestone. In the production process of slag brick, the particle size of the slag is generally smaller than 8 mm, and the steam temperature injected into the kiln is about 80 °C to 100 °C, the maintaining time is about 12 hours."[1] Blast furnace slag in granulated form has also been used as binder in mortar for building construction.[2]

Historic buildings constructed of slag brick are common in the traditional iron-working areas of Sweden[3] (Slaggtegel [sv]) and Finland.[4] Imperial Steel Works in Japan was a source of slag for brick production.[5] Slag brick was introduced in Scotland in the late 19th century.[6] In the Tees valley of Yorkshire slag bricks are also called scoria brick and were used for road construction.[7][8] Slag brick walls can be found in Butte, Montana, U.S.[9]

References

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  1. ^ Machinery, Fote (2023-02-15). "How to Process Slags: Classifications, Components and Applications | Fote Machinery". www.ftmmachinery.com. Retrieved 2025-09-27.
  2. ^ Fredrich, Birgit; Balksten, Kristin (2019-01-01). "Blast furnace slag in historic mortars of Bergslagen, Sweden". Proceedings of the 5th Historic Mortars Conference. RILEM Publications.
  3. ^ "Trummelsbergs bruk". Ekomuseum Bergslagen. Retrieved 2025-09-27.
  4. ^ "Ironworks Village in Finland".
  5. ^ 市原, 猛志 (March 2019). "鉄鉱滓煉瓦の建造物採用に関する歴史的研究: 官営八幡製鐵所における鉄鉱滓煉瓦普及に関する各種文書より". 産業考古学 = Industrial archaeology: the journal of Japan Industrial Archaeology Society (156): 2–10. ISSN 0910-6731.
  6. ^ "Making bricks from slag | Scotland's Brick and Tile Manufacturing Industry". www.scottishbrickhistory.co.uk. Retrieved 2025-09-27.
  7. ^ "Why this curious North Yorkshire brick never quite caught on". Darlington and Stockton Times. 2022-04-17. Retrieved 2025-09-27.
  8. ^ "The almost unbreakable slag bricks which lined the streets of the Tees Valley". Darlington and Stockton Times. 2022-03-20. Retrieved 2025-09-27.
  9. ^ "Butte, America's Story Episode 255 - Slag Brick Walls". The Verdigris Project. Retrieved 2025-09-27.
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