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Concrete cancer may refer to: * Rebar corrosion and spalling of the concrete cover above rebar caused by the rust expansion and accelerated by chloride attack and pitting corrosion of the steel reinforcements. * Alkali–silica reaction (ASR), also known as alkali-aggregate reaction (AAR), when reactive amorphous silica aggregates exposed to alkaline conditions (high pH) swell inside the concrete matrix leading to the development of a network of cracks. It may also refer to: * Sulfate attacks, an hat appellation covering different concrete degradation mechanisms: ** Delayed ettringite formation (DEF), also known as internal sulfate attack (ISA) when the temperature of fresh concrete exceeds 65 °C during its setting and hardening; ** External sulfate attack (ESA), and; ** Thaumasite form of sulfate attack (TSA). {{Disambiguation Concrete Corrosion Materials degradation