Abstract
The combustion processes in coal-fired power plants generate a huge amount of coal fly ash (FA) as by-products. In Japan, there has been a continuous annual increase in the emission of FA due to the increased operation of thermal power stations after the Great East Japan Earthquake, which occurred in 2011. However, effectively harnessing these produced ashes has been a challenge. Coal ash mixed materials (CAMMs) (FA, cement and water composite) are being exploited mainly for the construction of port infrastructures in Japan, but their usage has been so far limited. One of the reasons for the lack of effective utilisation is that there are limited research opportunities and knowledge on the long-term durability of CAMM. Hence, this study evaluated the durability of CAMM under different exposure environments (atmospheric curing, water immersion and seawater immersion) in order to provide more understanding of the long-term application of CAMM. Results from this study indicated that the strength of CAMM increases with an increase in cement addition and curing days. However, under seawater exposure conditions, it is probable that the strength decreases after 1 year due to leaching of calcium ions from the CAMM. The deterioration of CAMM starts from the surface. Therefore, in conditions where direct contact with seawater is conceivable, attention should be paid to long-term durability.
Published Version
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