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In May 1997, an exterior renovation project began on a well-known
and architecturally distinctive facility located on the campus
of Virginia Tech in Blacksburg, Virginia. The renovations were
prompted by spalling concrete, rust staining, and a desire to
upgrade the appearance of this popular facility. The existing
cementitious coating on the flying buttresses was discolored
by mildew stains and dirt, and had not prevented the
corrosion.
The repair and protection strategy at Cassell Coliseum
included the removal of all unsound, deteriorated, spalling,
or delaminated concrete; partial removal of steel chairs
and/or
ties close to the surface; application of an
epoxy-modified/
cementitious anticorrosion coating/bonding
agent in repair areas; application of a high-build,
two-component, polymer-modified, cementitious repair mortar to
fill the spalls or delaminations; and application of a
decorative and protective anti-carbonation coating, proven to
resist the future ingress of carbon dioxide gas.
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