earticle

영어

In this study, the experiment was carried out to investigate and analyze the engineering properties of ultra-high strength concrete according to replacement ratio and fineness of blast-furnace slag. The main experimental variables were water/binder ratio 23.5 27.5, 31.5, 35.5, 39.5(%) water content 165㎏/㎥ and mineral admixtures such as blast furnace slag powder.
Even in a case where the ratio of blast furnace slag powder is 70%, using a fineness of 8000 grade afforded a higher strength development than using a plain concrete, which indicates the potential of high utilization in the future. Although it has been pointed out that the concrete using blast furnace slag powder has a problem of yielding relatively low rate of strength development in the early age, it is demonstrated that this can be resolved by using a powder with fineness
greater than 6000 grade. It is considered necessary that powder fineness should be upgraded for the applications such as high performance concrete to be used in high strength required areas by considering hydration heat control and early strength requirements in the future.