Conductivity of Lithium Bromide Modified Conductive Mortar and Its Application Effect in Corrosion Protection

In order to improve the conductivity of conductive mortar in sacrificial anode and conductive mortar cathodic protection system, the conductive mortar was modified by adding lithium bromide. The relationships between resistivity of conductive mortar and dosage of lithium bromide, curing age were studied. And the corrosion protection effect of the sacrificial anode and conductive mortar cathodic protection system was verified through corrosion simulation test in splash area. The results show that lithium bromide significantly reduced the resistivity of conductive mortar, and the resistivity decreased with the increase of lithium bromide dosage. Curing age had almost no effect on the conductivity of the conductive mortar with high lithium bromide dosage prepared at the mixing ratio of 145.4 g lithium bromide, 450 g cement, 1 350 g sand, and 270 g water, and corresponding resistivity was all less than 100 Ω·cm. The steel pipe pile in splash could be well protected by this sacrificial anode and conductive mortar cathodic protection system.