After SURTREAT® applications all surfaces were noticeable harder and stronger. The concrete surfaces were inert to reaction with hydrochloric acid. Rusted steel surfaces were hard and stable, the rust was no longer friable. Some of the surfaces turned white indicating that adsorbed chlorides were being chemically complexed and purged to the surface.
SURTREAT® formulation performance appeared to be in line with expectations, based on results obtained from other steam manhole projects. It is anticipated that further brick and concrete deterioration and steel corrosion has been arrested.