Use of Blast Furnace Slag as Mining Fill


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Title: Use of Blast Furnace Slag as Mining Fill

Author(s): J. Metso, S. Makinen, and E. Kajaus

Publication: Special Publication

Volume: 79


Appears on pages(s): 1111-1122

Keywords: backfilling: binders (materials); blended cements; compressive strength; mines portland cements. blast furnace slag; (excavations);

Date: 5/1/1983

The investigation was carried out by using different amounts of blast furnace slag in blended cements. The slag content of the binder varied from 0 % to 100 % of the weight of the cement. The cement-aggregate ratio in the experiments was 1:15 and the water-cement + slag ratio was 5.9. The compressive strength of the mining-fill-concrete was determined at the age of 28, 91 and 182 days. The specimens were cured at both +8 OC and a t +20 oC. The optimum cement content in the binder when granulated slag was used, was 10 % at both temperatures. Using pelletized slag, the optimum cement content in binding agent was, at +8 oC, 30 %, and at +20 oC, 10 % of the weight of blended cement. At lower temperatures the finer slag gave higher compressive strength results while at the temperature of 20 ‘C no increase in compressive strength was observed.