Was the gulf oil leak sealed with cement as stated, or was it concrete?
In the oil industry it is known as cement. Granted, there are non-cement constituents, but there is no aggregate as the concrete that we're most familiar with has. The cement has to flow through small gaps and can't have rock chunks in it. The cement used in the oilfield also has a number of other additives to control such things as setting time and flow characteristics (called rheology).
