2020 Volume 74 Issue 1 Pages 38-43
This paper discusses the compositions of hydrated high volume blast furnace slag cement （HVBFSC） containing 60％ blast furnace slag （BFS）, 5％ anhydrate and 30％ ordinary Portland cement （OPC） with various admixtures by using XRD and SEM-EDS method. Ca（NO2）2, diethanol-isopropanolamine and their mixtures are used as admixtures. Regardless the kind of admixtures, C-S-H, AFt, calcium hydroxide and a small amount of AFm and hydrotalcite （HT） are formed, Mg/Al of HT was obtained from the relation between Mg/Si and Al/Si was measured by SEM-EDS, Al was corrected and Al/Ca was obtained. Ca/Si is determined by relation between Si/Ca corrected Al/Ca in C-S-H. Ca/Si of C-S-H is not changed and Al/Si of C-S-H in hydrated HVBFS is increased by addition of admixtures. Because BFS is accelerated by these admixtures.'
