Cracks in 13 cast-in-place pier caps supporting three bridges on the new Intercounty Connector toll highway in Maryland may be the result of a design flaw, according to the Maryland State Highway Administration.More than 40 cracks—ranging in width from 0.005 to 0.035 in. and in length from 7 in. to 3 ft, 8 in.—were discovered during a routine MSHA close-out and acceptance inspection of the ICC's $2.56-billion, 7.2-mile first phase.The project's first-phase contractor is Intercounty Constructors, a joint venture of Granite Construction Co., Watsonville, Calif.; Corman Construction Inc., Annapolis Junction, Md.; and G.A. & F.C. Wagman Inc., York, Pa.Parsons Transportation
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.