DETERIORATION MECHANISM OF CONCRETE STRUCTURE IN GROUND CONTAINING SULFATE ION

Abstract

The deterioration of concrete structure occurs due to various factors and additional environmental hazards. In this paper, sulfate attacks of concrete structure that caused sulfate ion in the ground were discussed. Firstly, an example of collapse due to deterioration of concrete housing foundations on land developed with coal waste in an old coal-mining area was discussed. Next, a verification test was implemented for investigations on the process of sulfate ion concentration in the test ground and concrete test pieces. As a result, it became clear that deterioration of the concrete structure was caused by an increase of the sulfate ion due to ground capillary phenomenon of soil water.