DETERIORATION OF CONCRETE STRUCTURES DUE TO ALKALI-DOLOMITE REACTION IN CHINA

A condition survey was carried out on four affected concrete structure s where dolomitic rocks had been used as coarse aggregates. Compositio ns, textures and alkali reactivities of partial coarse aggregates were determined and the deteriorated concrete cores were subjected to petr ographic examination. The results revealed that the dolomitic aggregat es were potentially alkali reactive and were responsible for the deter ioration of the concrete structures. It was the frist time that damage to concrete by alkali-dolomite reaction was recognized in China.