earticle

영어

The purpose of this study was to investigate the expansion of alkali-activated mortar based on ground granulated blast furnace slag containing reactive aggregate due to alkali-silica reaction. Also this study was particularly concerned with the behaviour of alkaline materials in the presence of reactive aggregates. The experimental program included expansion measurement of the mortar bar specimens and the determination of the morphology and composition of the alkali-silica reaction products by scanning electron microscopy(SEM), energy dispersive x-ray(EDX).
According to the experimentation result, Although alkali-activated ground granulated blast furnace slag mortars showed expansion due to the alkali-slica reaction, the expansion exhibited less than 0.1% at 14 day. So it is safety. After the accelerated test, SEM analysis showed the presence of alkali-silica gel and rim around the aggregate and cement paste, According to the EDX, the reaction products decreased markedly as alkali-activated ground granulated blast furnace slag was used.
In addition, the study on improving the quality of alkali-activated mortar bar by substituting other materials of mineral admixture is needed to assure of the durability properties of concrete.