A number of models are available for predicting time to corrosion and time to cracking of reinforced
concrete structures subjected to chloride or carbonation induced reinforcement corrosion. However,
there are few models that try to predict rates of overall deterioration. This paper looks at some simple
models that can be generated in spreadsheets and how they can be used to predict deterioration rates
in a range of new and existing reinforced concrete structures. Several case histories are given of their
application to new and existing reinforced concrete structures where estimation of time to corrosion and
rate of damage have led to cost effective repair solutions and the avoidance of major replacement
works. However, the time to cracking and the deterioration index calculations need further field
validation to check their validity and their usefulness is providing structure owners with deterioration
rates.
Key words: reinforcement corrosion, corrosion rate, delamination, spalling, chloride content,
depassivation.