While irradiating the increase manner of content proportion of the ferric oxide in rimonaito and the production mannered null ultraviolet ray of rimonaito which makes

摘要

PROBLEM TO BE SOLVED: To provide a limonite securing a desired property and being stable in a chemical property, a limonite-containing material which contains the limonite and a limonite-containing concrete which contains the limonite.;SOLUTION: In the limonite, the limonite-containing material which contains the limonite and the limonite-containing concrete which contains the limonite, the limonite has acquired a reflective strength at a plane index (110) in X-ray diffraction which is stronger than that at a plane index (111) by a treatment wherein a raw limonite is dried while being irradiated with an ultra-violet light. The limonite particularly has a reflective strength of 85 or less at the plane index (111) relative to 100 of that at the plane index (110). The limonite is also prepared by drying with heat in an ozone atmosphere an incomplete limonite whose reflective strength at the plane index (111) is stronger than that at the plane index (110).;COPYRIGHT: (C)2006,JPO&NCIPI