Adjacent Precast Box Beam Bridges

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For years, adjacent prestressed concrete box-beam bridges have been employed for short and medium spans—two-thirds of all state Department of Transportations (DOTs) use them. While they are popular due to ease of construction and low profile, cracks in the longitudinal grouted joints between adjacent beams have often been observed. This can lead to leakage through the joint, accelerating corrosion of reinforcement and diminishing load transfer.

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Defining and Refining Polished Concrete

Hiperfloor premium reflectiveHC550-0142

French-American architect Paul Philippe Cret once said, “Of the many doorways we pass in a short walk, most are fulfilling their purpose, most of them are well-enough built. [But] how many are worth a second look?” Cannot the same be said about architectural polished concrete? Are your floors meeting your design intent or did you settle? Do you know how to distinguish between the floor you asked for, and the floor being presented to you during the punch list?

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What’s Wrong With My Precast Concrete Garage?


Precast double-tee construction has become a dominant method for building parking garages in North America. The double-tee beam deck system of this construction type provides a finished wearing surface, supports vehicle loading, and forms an integral part of the lateral force-resisting system. However, maintenance and repair of deck connections is a common problem with this type of construction. The most common cause is perhaps the least considered.

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Bearing Pad Durability in Precast Concrete Garages

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Bearing pads are used widely in precast concrete parking garages. They function as buffers between the separate concrete members to prevent damage and facilitate movement (much like cartilage between bones at joints). Bearing pads should last for the design life of the structure, but need to be replaced when they are not sufficiently durable. The ‘surgery’ to replace the pads properly is a complex operation, with few published guidelines.

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Missouri Campus Features New Terra Cotta Application

Terra cotta tile was clad onto this project's insulated composite precast concrete sandwich panels.  Photos © Jacia Phillips

By Dirk McClure

The University of Missouri, located in Kansas City, boasts the country’s first terra cotta-clad insulated composite precast concrete panels assembly.

Before this installation, terra cotta had been clad into non-insulated panels in a few projects. At the Henry W. Bloch Executive Hall for Entrepreneurship and Innovation, however, terra cotta tile was clad onto 1783 m2 (19,200 sf) of 3.6-m (12-ft) wide insulated composite precast concrete sandwich panels.

Designed by BNIM Architects and …

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G8WAY DC: Innovative UHPC Elements

Photo © Vic Tucker

Ultra-high performance concrete (UHPC) provides strength, ductility, durability, and aesthetic design flexibility while still being highly moldable and able to replicate texture, form, and shape. It is this combination of superior properties that also provides architects and engineers with a new kind of freedom—to design unique, unprecedented UHPC architectural elements that are also sustainable and extremely durable.

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