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Rebar-free, but steel-laden, HPC core shoulders 850-ft. Seattle tower

Sources: Magnusson Klemencic Associates, Lease Crutcher Lewis, and Wright Runstad & Co., Seattle; CP staff

A 58-floor mixed-use tower in Seattle has topped out after a 10-month schedule on the strength of a unique core wall system with requisite volumes of high performance concrete but no conventional rebar. Rainier Square Tower marks the debut of what local engineer Magnusson Klemencic Associates (MKA) dubs the Concrete-Filled Composite Plate Shear Wall (CPSW) system. In contrast to a conventional reinforced concrete wall with large diameter rebar, the system as engineered for the 850-ft. structure redirects steel to composite panels: Half- or ¾-in. thick plates, connected with 1-in. diameter steel cross ties running vertically and horizontally on 12-in. center grids. 

Read more: Rebar-free, but steel-laden, HPC core shoulders 850-ft. Seattle tower

Corps, Marines unit proves high volume, large bead 3D concrete printing

Source: Marine Corps Systems Command, U.S. Army Corps of Engineers Construction Engineering Research Laboratory, Champaign, Ill.

Marine Corps Systems Command and 7th Engineer Support Battalion staff joined U.S. Army Corps of Engineers Construction Engineering Research Laboratory (CERL) colleagues earlier this month to test a 3D concrete printing operation with a late model volumetric mixer feeding a 3-in. nozzle. The demonstration was aimed fabricating a bunker and followed barrack and bridge structure printing with a 2-in. nozzle-equipped assembly. 

Read more: Corps, Marines unit proves high volume, large bead 3D concrete printing

EPA leaves sound regulations underpinning SPCC plans alone

Sources: Environmental Protection Agency; National Ready Mixed Concrete Association, Silver Spring, Md.; CP staff

After more than three years of soliciting expert advice and public comment on issuing a proposed rulemaking potentially expanding the petroleum product spill prevention, control and countermeasure (SPCC) terms typical of concrete plant environmental permits, EPA Administrator Andrew Wheeler signed a final action establishing no new regulatory requirements under the Clean Water Act (CWA). 

Read more: EPA leaves sound regulations underpinning SPCC plans alone

Report ranks states by highway cost efficiency, from N.D. to N.J.

Sources: Reason Foundation, Los Angeles; CP staff

The Annual Highway Report from public policy think tank Reason Foundation finds that the nation’s highway conditions are deteriorating, especially in a group of problem plagued states struggling to repair deficient bridges, maintain Interstate pavement and reduce urban traffic congestion. In descending order, the respective leaders and laggards are North Dakota, Virginia, Missouri and Rhode Island, Alaska, New Jersey.

Read more: Report ranks states by highway cost efficiency, from N.D. to N.J.

Brickworks builds Glen-Gery brand with $32M Sioux City deal

Sources: Brickworks North America Corp., Wyomissing, Pa.; CP staff 

Brickworks North America, the recently established parent company of clay masonry mainstay Glen-Gery Corp., has closed on Iowa-based Sioux City Brick, a family-owned operator since 1913. The $32 million transaction brings three production lines across two plants, with capacity upward of 160 million brick, plus five retail distribution outlets and exclusive U.S. distribution rights to the Feldhaus thin brick system.

Read more: Brickworks builds Glen-Gery brand with $32M Sioux City deal