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METHOD FOR MANUFACTURING STEELMAKING SLAG ROADBED MATERIAL
To provide a method for manufacturing a steelmaking slag roadbed material that has an extremely low expansibility, 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 and followed by applying steam aging at an ordinary pressure, 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 and following said crushing followed by applying steam aging, with a sieve x having a mesh size of 10 mm or less, are 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.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方法の提供。【解決手段】粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕した後に常圧で蒸気エージングを施した製鋼スラグ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且つ該破砕後に蒸気エージングが施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となるように製鋼スラグａの粒度分布を調整する。【選択図】図６
METHOD FOR MANUFACTURING STEELMAKING SLAG ROADBED MATERIAL
To provide a method for manufacturing a steelmaking slag roadbed material that has an extremely low expansibility, 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 and followed by applying steam aging at an ordinary pressure, 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 and following said crushing followed by applying steam aging, with a sieve x having a mesh size of 10 mm or less, are 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.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方法の提供。【解決手段】粒径４０ｍｍ以下の割合が８０mass％以上となる粒度に破砕した後に常圧で蒸気エージングを施した製鋼スラグ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且つ該破砕後に蒸気エージングが施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となるように製鋼スラグａの粒度分布を調整する。【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) / TAKAHASHI KATSUNORI (author) / WATANABE KEIJI (author)
2019-08-22
Patent
Electronic Resource
Japanese
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