Hydration Behavior of LD Slag at Autoclave Test
1979 Volume 65 Issue 13 Pages 1878-1886
Details
1979 Volume 65 Issue 13 Pages 1878-1886
An investigation was made of hydration behavior of LD slag in autoclave test for evaluating expansion potential of it. The results obtained are as follows:
(1) Hydration degree of LD slag by autoclave test was expressed by the following empirical formula for generally used conditions. W= 0.02p0.63t0.34d-0.47f0.70
W: hydration degree (%) p: steam pressure (kg/cm2)
t: treatment time (h) d: mean particle size (mm)
f: free lime content (%)
(2) Hydrating mineral phases of slag and hydrates were not dependent upon the autoclave test condition. Hydration of LD slag was caused substantially by lime solid solution and unassimilated lime. In some cases, disintegration, though a little in quantity, caused by unassimilated magnesia was observed. Reaction products consisted mainly of Ca (OH) 2and also of CaCO3and Mg (OH) 2.
(3) Evaluation of expansion potential of LD slag in autoclave was able to be made under any condition tested in this experiment. The most effective test condition was selected to have sufficient amounts of hydration and easy operation. Differences in expansion potential of LD slags could be determined by any of three measurements: volume expansion measurement using block specimen briquetted, disintegration measurement, and weight increase measurement.
