A recent series of dynamic tests demonstrates that there are several types and doses of steel-fiber reinforcement that can be used in performance-based seismic design of coupling beams—headers that link openings in concrete shear walls—to reduce rebar congestion.
Making its first-ever international expansion, Denver-based Brundage-Bone Concrete Pumping will
acquire three companies in the U.K. that provide concrete-pumping services.
Concrete’s large carbon footprint—that is, the amount of carbon dioxide emitted during the cement manufacturing process—is estimated to be 5% of industrial CO2 emissions, a source of concern in the battle against human-caused climate change.
Moving from the lab to the field, a highway off-ramp bridge under construction in Seattle features memory-retaining metal rods and bendable concrete designed to provide the structure with flexibility sufficient to withstand a major seismic event.
Answering a call from the Federal Highway Administration, a group of steel-bridge advocates have introduced a new type of tub girder that requires less fabrication and installation time.