Abstract
Hematite ore was considered as a potential high-density rock-fill material for the constuction of a major coastal protection work in The Netherlands (the Storm Surge Barrier in the Eastern Scheldt). Three groups of hematite ore from the Itabira District, Brazil, were investigated for their chemical and mechanical stability in a prefeasibility study. Chemical leaching tests showed only minor chemical activity in one of the three investigated groups of rock samples. The microstructure of the ore was shown by slake durability testing and a sand blast test to be a significant factor influencing mechanical resistance against abrasive processes. The iron ore contains an important volume percentage of cryptocrystalline limonite. The mechaical characteristics of the ore are influenced by the microstructural distribution of the limonite. Redistribution of limonite within the ore and release of limonite from the ore takes place in flowing water, which might lead to visual pollution of the environment if this material is used as rock-fill in coastal protection constructions.
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