Corrosion threatens the safety and durability of concrete structures and plays havoc upon the lives of people, hence the necessity to analyse it thoroughly within the context of Maintenance and Repair of Concrete Structures.
Maintenance and Repair of Concrete Structures includes the following modules:
Embedded metal corrosion
Deterioration of cementitious systems
Strategies and materials for surface repair
Surface preparation and protective treatments
Concepts on structural repair
Tender specifications and case studies
On average, three to four percent of Gross Domestic Product (GDP) is spent on corrosion, which is too high and calls for corrosion protection strategies, hence the necessity of a specific management.
Delving deeper into the fundamentals of corrosion, it has been proved that the latter is nothing but, chemically speaking, the extractive metallurgy in reverse. Scientific and chemical analyses of corrosion and other construction materials, steel and iron, have been covered.
Some specific themes are:
Non-uniformity of metal and concrete
Expansive nature and cracking
Having covered the fundamentals of corrosion, the mechanisms of carbonation-induced corrosion and chloride-induced corrosion have been analysed. Carbonation reduces the PH of the concrete pore solution and causes uniform corrosion, with a critical PH threshold for corrosion initiation verging on nine (9).
Conversely, chlorides can cause localized or pitting corrosion, and:
the critical chloride threshold is a function of both steel and cementitious system; and
the corrosion inhibiting admixtures can enhance the chloride threshold.
Cracks must be checked for and dealt with in concrete structures, as they can accelerate the ingress of deleterious elements and cause accelerated or localized corrosion.
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