砕石粉を使用した砕石・砕砂コンクリートの性状 [in Japanese] Properties of Fresh and Hardened Concrete Using Crushed Stone Powder as Part of Fine Aggregate [in Japanese]
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砕石・砕砂を乾式方法で製造する際に発生する石粉を150μmふるいで分級した砕石粉を有効利用の対象として, この砕石粉を砕砂の一部と置換して使用したコンクリートの配 (調) 合の設定結果, フレッシュ性状, 強度発現性および耐久性などの諸性状に関する実験結果にっいて報告する。
Crushed stone powder is limited to what passes through a 150-micrometer sieve in which the by-product is separated and/or ground at the time of manufacturing of a crushed stone and/or a crushed sand by dry process in the plant. Such crushed stone powder can be a promising material used for the purpose of decreasing the amount of bleeding of concrete with high water-cement ratio and small amount of finer part of concrete. The reason of the fineness limitation ofcrushed stone powder as mentioned above is that the indication of almost fine powder such as crushed stone powder which passes through a 150-micrometer sieve did not increase remarkably a unit content of water from experimental results of mortar and concrete. Higher compressive strength at young ages and durability such as lower carbonation can be expected when fine aggregate is replaced by crushed stone powder. Drying shrinkage, frost damage and water permeability of concrete are almost same if fine aggregate is replaced by crushed stone powder. The quality of crushed stone powder is specified in the first JIS A 5041 which will be published at Spring of 2009.
- Concrete Journal
Concrete Journal 46(11), 18-24, 2008-11-01
Japan Concrete Institute