DURABILITY OF HIGH-PERFORMANCE CONCRETE IN MAGNESIUM BRINE

The durability of six concretes exposed to magnesium brine was monitor ed for 24 months. These concretes incorporated ground granulated blast furnace slag, silica fume, and fly ash. The Young's moduli, chloride penetrations, and median pore diameters were measured. There was a cyc lic nature to these properties due to the complicated interaction of h ydration with magnesium, chloride and sulfate attack. Mineral admixtur es, in combination with a long initial cure, provided the most durable concrete. Concrete with 65% slag had the best overall durability to t he brines tested.