| Title |
Effectiveness of Copper Slag in Reducing Alkali-Silica Reaction Expansion |
| Authors |
Kim Young-Su ; Jeong Euy-Chang ; Lee Dong-Un |
| Keywords |
Copper Slag ; Alkali-Silica Reaction ; Additional Evaporable Water(AEW) |
| Abstract |
This study is to investigate the effect of different levels of cement replacement(0, 5, 10, 15, 20, 25%) by copper slag(CoS) on the expansion of mortar bars containing reactive aggregates. The experimental program included expansion measurement of the mortar bar specimens, also the determination of the morphology and composition of the alkali-silica reaction products by using scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), and x-ray fluorescence spectrometer(XRF). From the test result, the expansion levels of mortar bars containing CoS reduced as replacement levels increased. and the 25% replacement of CoS produced the least expansion. The amount of additional evaporable water(AEW) decreased with an increasing amount of CoS replacement, which indicated that the amount of alkali-silica reaction products decreased an increasing amount of CoS replacement. Containing CoS, the higher replacement level, the higher CaO/SiO2, CaO/(Na2O)e, and EBIV ratio in the alkali-silica gel, the lower the gel's capacity for expansion. |