Determination of Slag Content in Blast-furnace Slag Blended Cement

摘要

The utilization of blended cement for construction is becoming a key technology for the realization of sustainable development. Determination of blending components in blended cement is essential for the appropriate material design of blended cement. There are several determination methods of blast-furnace slag in blast-furnace slag blended cement using optical microscopy, the XRD/ Rietveld method and the selective resolving method using citric acid, acetone and methanol. Each one of these methods involves problems and is not entirely satisfactory. In this study, the combination of two selective resolving methods, one that uses citric acid and methanol to solve calcium silicates such as C3S and C2S, and another one that uses KOH-sucrose to solve the interstitial phase and calcium sulfate gypsum, are applied for determination of slag or fly ash in blast-furnace slag blended cement or fly ash blended cement. Using the proposed combined method, the blending component content was successfully determined directly from the residue without compensating calculation.