There were problems with the concrete mix even before they started pouring. http://www.concreteconstruction.net/infrastructure-projects/the-concrete-canal.aspx

There were problems with the concrete mix even before they started pouring. http://www.concreteconstruction.net/infrastructure-projects/the-concrete-canal.aspx http://www.concreteconstruction.net/infrastructure-projects/... (Feb 2013)