Title:
Hydraulic Activity of Slags Obtained
by Vitrification of Wastes
Author(s):
Jean Pera, Assefa Wolde, and Michel Chabannet
Publication:
Materials Journal
Volume:
93
Issue:
6
Appears on pages(s):
613-618
Keywords:
blast furnace slag; blended cements; compressive strength;
hydraulics; wastes.
DOI:
10.14359/9868
Date:
11/1/1996
Abstract:
Instead of landfilling municipal waste incineration bottom ash, it is possible to produce latent hydraulic materials for blended cements by a smelting process. The waste material is mixed with various amounts of quicklime, calcium carbonate, alumina, calcium chloride, and iron oxide; then it is smelted at about 1500 C (2732 F) and cooled to obtain a synthetic glassy slag. After being ground, this slag is activated by clinker and gypsum. In the present study, the results concerning two blended cements contain-ing 47.5 and 76percent synthetic slag, respectively, are presented. The me-chanical properties of these cements are compared to those of a blast furnace slag blended cement. The influence of the gypsum content on the strength of mortars is also studied. It is shown that the synthetic slags present sufficient hydraulic activity and low heavy metal content. In some cases, the performances are the same as those obtained with a ground granulated blast furnace slag.