Abstract
Outdoor exposure tests of fly ash concrete have been carried out in various places around Japan since 2009, and the durability of the specimens has been monitored for 10 years to assess how differences in exposure environment would influence the long term physical property and durability of fly ash concrete as well as the degree of pozzolanic reaction of fly ash. This paper reports the changes in physical properties observed during the first seven years and the pozzolanic reaction degree after seven years of exposure. The durability of fly ash concrete was found to be improved as the pore structure became complicated due to pozzolanic reaction. It was also found that there was no difference in the pozzolanic reaction degree of fly ash in concrete between the different exposure conditions after an adequate time period of seven years.
