Before tackling construction of the 180-foot-span Presumpscot River Bridge in Falmouth, Maine, general contractor Cianbro Corp. realized it couldn't complete the job on schedule using conventional falsework to support forms for the structure's cast-in-place spandrel arch ribs. Read more
Intersections represent a special challenge in concrete pavement construction. Having to accommodate traffic flow while striving to meet project specifications for drainage, smoothness, and other structural requirements tests a contractor's construction and organizational skills. Read more
Completed in September 1995, the $194.5 million Calumet Tunnel in south suburban Chicago represents public-works construction at its best. Read more
Waterstops play a crucial role in concrete construction, preventing seepage of water or other liquids through construction, contraction, and expansion joints. Read more
Presented here are sample specification excerpts that show contractors and specifiers how F-number requirements are typically addressed in project specifications for random-traffic floors. Read more
Well before the first winning athlete is acknowledged at the 1996 Summer Olympics in Atlanta, a construction team building a public stadium for the much-anticipated event has put in a performance worthy of a gold medal. Read more
Dubbed "Concrete Super Bowl 95" by its construction team, an incredible 31-day building effort last summer resulted in the placement of 600,108 square feet of concrete slabs--enough concrete to cover nearly 13 football fields. Read more
We're having a problem with lignite (coal) in the sand we use to make concrete. There's no cost-effective way to remove it, and it floats to the surface in concrete slabs. Read more
We're designing a concrete structure in Egypt, and I received test results for the aggregate to be used in the concrete. Read more