Abstract
To investigate the long-term alteration behavior of concrete, two ways of experiments were conduced. First, the analytical techniques were proposed on the experimentally synthesized hydrates. The thermal analysis, chemical analysis and analytical electron microscopy were taken on the several mixtures of hydrates, and the reliability of these methods were confirmed. Next, these evaluation methods were applied on the concrete structures deteriorated by sea water, by alkali-aggregate reaction or by neutralization. The sea water erosion and alkali-aggregate reaction are more destructive than the neutralization, though the well-manufactured concrete structure is proof against the various expected environmental conditions even its hydrated phase was completely carbonated.
