CLASSIFICATION OF PROBABILITY OF DETERIORATION OF CONCRETE BY SULFATE ATTACK BASED ON INVESTIGATION RESULTS OF SULFATE CONTENT OF GROUND

Abstract

  In this paper, deterioration of concrete structures due to sulfate or sulfate ion which are contained in ground were discussed. First, examples of collapse due to deterioration of concrete housing foundations on land developed with coal waste in an old coal-mining area was explained. Damage occurred on the land developed with mudstones of Neogene formations was also explained. These deterioration and damage were caused by sulfate or sulfate ion which are contained in soil. The process that pyrite was oxidized by bacteria and sulfate ion was formed in deposited layer was examined. Moreover, the review on sulfate ion content in ground in Japan was carried out. As the results, hazard map of deterioration due to sulfate attack concerning was geological and meteorological factors was proposed.