Challenging Tall Walls

The inside panels were braced with deadmen during construction.

Access to the tops of the forms was only with a manlift.

More than 300 corbels were cast into the walls after stripping.

Forms for the chorded radius walls were adjusted for each placement.

A single worker guides the pump to a central location inside the forms from which concrete flowed to the edges.

The 28 feet tall by 35 feet wide one-sided panels were tied back with she bolts.

The J-Ring indicates the SCC’s passing ability as it passes through a series of closely spaced bars. This SCC mix exhibits good stability--aggregate particles suspended in mix at the surface indicate it will not segregate after placement.

This SCC mix exhibits good stability--aggregate particles suspended in mix at the surface indicate it will not segregate after placement.

This photo of the final mixture with VMA has a slump flow in the 26-28 inch range and shows excellent static stability.

These mixes with no suspended aggregate and shiny paste are examples of unsuccessful attempts to increase slump flow to 26 to 28 inches without VMA. Notice the abundance of paste at the surface due to rock falling out of suspension in the mixture.

These mixes with no suspended aggregate and shiny paste are examples of unsuccessful attempts to increase slump flow to 26 to 28 inches without VMA. Notice the abundance of paste at the surface due to rock falling out of suspension in the mixture.

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