ABSTRACT
ABSTRACT Recently, the amount of discharge of CO2 to the atmosphere is increasing from human activities resulting in global warming and climate changes. Construction industry is strongly recommended to effectively use industrial waste, such as ground granulated blast furnace slag (GGBS) which arises when refining steel and fly ash discharged from thermal power plant, to reduce CO2 emissions, etc. Especially, GGBS concrete has high durability for chloride attack and chemical attack. Since commonly used type of GGBS concrete in Japan has slag replacement ratio between 40% and 60%, it is necessary to increase the replacement ratio in order to further reduce environmental impact. However, studies on physical property and durability of concrete with high content of GGBS are few. In this study, the effects of high replacement (70–90%) of GGBS on the concrete quality was experimentally investigated through several tests, such as compressive strength, salt water immersion, chloride ion migration, accelerated neutralization and surface air permeability. From the experimental results, it was observed that concrete with high content of GGBS showed high resistance for chloride ions ingress. However, it was confirmed that for the replacement ratio 80% or above, compressive strength and neutralization resistance greatly decreased.
