ABSTRACT
This paper presents examples of the degree of damage Reinforced Concrete structures can sustain as a result of corrosion and the scope for repair and remediation works possible using sprayed concrete. The structures examined over the last 10 years include: a cooling tower (96m high), a chimney (100m high) and a grain silo battery (24m high). Results of damage assessments are presented in relation to corrosion, chemical degradation, concrete cracks, and defects resulting from incorrect design and poor work quality. The advantages of the dry process sprayed concrete technique for repair work are emphasized. The necessity to undertake an assessment of the structural condition prior to repair, followed by the development of suitable controls during repair works is pointed out. The repair method must take into account not just the effectiveness but also other conditions including the period of service downtime. Regular testing enables immediate corrections to be implemented and minimizes the chance of mistakes.
