Construction of new cement plants is under way in Africa. At least nine new cement plants are under way in Africa, where leading producers are expanding capacities to meet growing construction demands on the continent. The work will cost billions of dollars and take several years to complete, but political instability poses risks.All eyes are on North Africa, where cement demand is expected to boom once new governments review construction sector policies in Egypt, Algeria and Libya.The rebuilding of Libya is at the top of the regional agenda. However, the region's leading cement firms report sluggish performance—especially in Egypt—due to
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.