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A platform for research: civil engineering, architecture and urbanism
METHOD FOR MANUFACTURING STEELMAKING SLAG ROADBED MATERIAL
To provide a method for manufacturing steelmaking slag roadbed material in which a steelmaking slag roadbed material having an extremely low expansibility is manufactured with high productivity.SOLUTION: Concerning a steelmaking slag a crushed to a grain-size in which the percentage of a grain size of 40 mm or less is 80 mass% or more, by increasing/decreasing the fine-grain and fine-powder portions under a condition in which (i) concerning a portion of the steelmaking slag a, it is classified with a sieve x having a mesh size of 10 mm or less to reduce the fine-grain and fine-powder portions, followed by mixing with the remainder of the steelmaking slag a, or, (ii) fine-grain and fine-powder portions previously obtained by classifying a steelmaking slag crushed to a grain-size in which the percentage of a grain size of 40 mm or less is 80 mass% or more with a sieve x having a mesh size of 10 mm or less is added to steelmaking slag a and mixed, the grain-size distribution of steelmaking slag a is adjusted so as the Fuller index satisfies 0.4 to 0.6 when the grain-size distribution of steelmaking slag a is approximated by Andreazen's curve formula, and followed by applying steam aging at an ordinary pressure. Thereby, a steelmaking slag roadbed material in which the expansibility is reduced to the lowest level achievable with the applied aging condition can be manufactured with high productivity.SELECTED DRAWING: Figure 6
【課題】膨張性が極めて低い製鋼スラグ路盤材を高い生産性で製造する。【解決手段】粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕された製鋼スラグａについて、（i）製鋼スラグａの一部について篩目が１０ｍｍ以下の篩ｘで分級することで細粒・微粉分を減じた後、製鋼スラグａの残部と混合する、若しくは、（ii）以前に、粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕された製鋼スラグを篩目が１０ｍｍ以下の篩ｘで分級することで得られている細粒・微粉分を、製鋼スラグａに加えて混合する、の条件で細粒・微粉分を増減することにより、製鋼スラグａの粒度分布をAndreazenの曲線式で近似した場合に、Fuller指数が０．４〜０．６を満足するように製鋼スラグａの粒度分布を調整した後、常圧で蒸気エージングを施す。これにより、適用したエージング条件で到達し得る最低レベルにまで膨張性を低減した製鋼スラグ路盤材を高い生産性で製造することできる。【選択図】図６
METHOD FOR MANUFACTURING STEELMAKING SLAG ROADBED MATERIAL
To provide a method for manufacturing steelmaking slag roadbed material in which a steelmaking slag roadbed material having an extremely low expansibility is manufactured with high productivity.SOLUTION: Concerning a steelmaking slag a crushed to a grain-size in which the percentage of a grain size of 40 mm or less is 80 mass% or more, by increasing/decreasing the fine-grain and fine-powder portions under a condition in which (i) concerning a portion of the steelmaking slag a, it is classified with a sieve x having a mesh size of 10 mm or less to reduce the fine-grain and fine-powder portions, followed by mixing with the remainder of the steelmaking slag a, or, (ii) fine-grain and fine-powder portions previously obtained by classifying a steelmaking slag crushed to a grain-size in which the percentage of a grain size of 40 mm or less is 80 mass% or more with a sieve x having a mesh size of 10 mm or less is added to steelmaking slag a and mixed, the grain-size distribution of steelmaking slag a is adjusted so as the Fuller index satisfies 0.4 to 0.6 when the grain-size distribution of steelmaking slag a is approximated by Andreazen's curve formula, and followed by applying steam aging at an ordinary pressure. Thereby, a steelmaking slag roadbed material in which the expansibility is reduced to the lowest level achievable with the applied aging condition can be manufactured with high productivity.SELECTED DRAWING: Figure 6
【課題】膨張性が極めて低い製鋼スラグ路盤材を高い生産性で製造する。【解決手段】粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕された製鋼スラグａについて、（i）製鋼スラグａの一部について篩目が１０ｍｍ以下の篩ｘで分級することで細粒・微粉分を減じた後、製鋼スラグａの残部と混合する、若しくは、（ii）以前に、粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕された製鋼スラグを篩目が１０ｍｍ以下の篩ｘで分級することで得られている細粒・微粉分を、製鋼スラグａに加えて混合する、の条件で細粒・微粉分を増減することにより、製鋼スラグａの粒度分布をAndreazenの曲線式で近似した場合に、Fuller指数が０．４〜０．６を満足するように製鋼スラグａの粒度分布を調整した後、常圧で蒸気エージングを施す。これにより、適用したエージング条件で到達し得る最低レベルにまで膨張性を低減した製鋼スラグ路盤材を高い生産性で製造することできる。【選択図】図６
METHOD FOR MANUFACTURING STEELMAKING SLAG ROADBED MATERIAL
製鋼スラグ路盤材の製造方法
ICHIKAWA KOICHI (author) / SHIMODA ISAO (author)
2019-08-22
Patent
Electronic Resource
Japanese
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