Stopping of world oceans environment clogging by contaminated ports dredged sludge. Construction materials containing 50–60% sludge of sea ports were developed. Uniaxial compressive strength of the materials on the 90th day of curing reached 14.5 MPa. The value of linear expansion is 0.35% and water absorption is 13.4% after 90 days. The materials have new structural formations from mainly amorphous CSH-type and carbonates.