Properties of granulated blast furnace slag mortar using carbon amino silica black

This study was to investigate the effects of granulated blast furnace slag (GBFS) on the properties of black colored mortar. For this purpose, color evaluation and was carried out on white Portland cement (WPC) mortar mixed with of carbon amino silica black (CASB) by changing the proportion of GBFS. Flow test, compressive strength test and color evaluation were carried out on cement mortar by changing the proportion of WPC and ratio of GBFS. The addition ratio of GBFS influences significantly the color value efficiency in colored mortar. The overall amount of Ca(OH)2 in the colored mortar using GBFS was smaller than that of WPC colored mortar, and it was contributed to decreases efflorescence and gave more visible color to mortar. The flow of colored mortar was increased with mixing CASB, and increased in proportion to the addition rate of the GBFS. In addition the strength of colored mortars with GBFS at the long-term aged (after 28 days) was higher than that of the general WPC colored mortar, although its strength was developed slowly at the early ages.