Journal Published Online: 01 January 1988
Volume 10, Issue 2

Production and Evaluation of a New Source of Granulated Blast Furnace Slag



A granulation pilot plant was installed at Algoma Steel Corp., Sault Ste. Marie, Ontario, for the production of about 40 metric tons of granulated blast furnace slag to be tested for concrete and mine backfill applications. The granulated slag was obtained by quenching the molten slag by jets of high-pressure water. Heat loss was maintained at the level expected when the full-size plant is in operation so as to generate a representative slag sample. The granulated slag was allowed to drain in the slag pit before being transported to the grinding facilities, where it was dried in a converted kiln, reducing the moisture content from 8 to 0.3%. The unit power consumption for grinding the granulated slag was similar to typical figures for grinding portland cement clinker in the lower Blaine range.

Quantitative X-ray diffraction analysis showed that the granulated slag was about 90% glass. The magnesium oxide content was about 18% and was likely in the form of a calcium magnesium alumino silicate glass.

Mortar tests performed according to ASTM Specification for Ground Iron Blast-Furnace Slag for Use in Concrete and Mortars (C 989) showed that the slag ground to 4600 and 6080 cm2/g met the requirements for Grades 100 and 120, respectively.

The slag investigated has considerable potential for partial replacement of portland cement in concrete. At comparable fineness, the strength characteristics of the concrete incorporating the Canadian granulated slag are comparable with those of the concrete made with the other Canadian slag (pelletized) used in the investigation.

Author Information

Douglas, E
CANMET, Energy, Mines and Resources Canada, Ottawa, Ontario, Canada
Wilson, H
CANMET, Energy, Mines and Resources Canada, Ottawa, Ontario, Canada
Malhotra, VM
CANMET, Energy, Mines and Resources Canada, Ottawa, Ontario, Canada
Pages: 13
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Stock #: CCA10087J
ISSN: 0149-6123
DOI: 10.1520/CCA10087J