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Granulated blast furnace slag (GBFS) is produced by injecting pressurized water to rapidly cool the molten slag produced in the blast furnace. This product is popular in Japan and other countries for use as raw material for cement. In recent years, the use of GBFS sand as fine aggregate in concrete has been increasingly discussed from the viewpoint of environmental impact reduction and effective utilization of by-products in Japan. The various physical properties of concrete with GBFS sand were evaluated, such as the compressive strength, drying shrinkage, and carbonation. Consequently, it was shown that GBFS sand can modify the interface between hardened cement paste and itself owing due to the reaction of amorphous phase in GBFS sand. This study will focus on freeze-thaw (F-T) and sulfuric acid resistance to investigate the performance of GBFS sand. In addition, we examined various test conditions to establish a simple quality evaluation method for GBFS sand.

Quality Evaluation of Granulated Blast Furnace Slag Sand Via Acid Immersion and Freeze-Thaw Tests