Sea water attack on sulphate resisting cement containing granulated slag and silica fume

Pozzolanic cement was prepared from sulphate-resisting cement clinker and granulated blast-furnace slag with 8\% silica fume. The pastes were immersed in sea water up to one year. The durability of these pastes was followed by determining the free lime, total chloride and sulphate as well as compressive strength of their mortars after 1,3,6,9 and 12 months. The aggressive attack of sea water was discussed and correlated with the type of the blended cement. The resistivity of cement mortars diminishes with the increase of granulated slag portion in cement mix. The blended cement pastes which contain silica fume and slag together give the lower values of total chloride than sulphate-resisting cementpastes and vice versa of sulphate content.