CONCRETE · 1983 · 12 citations · 0 references
EngineeringMaterials EngineeringMaterials ScienceBuilding MaterialsCorrosion ScienceInorganic ChemistryCementitious MaterialsConcrete ConstructionConcrete MaterialsConcrete TechnologyCorrosion In ConcreteCorrosion ProtectionCarbonationCarbonation DepthCarbonation EffectsCarbonation-induced DamageCarbonation-induced DeteriorationCement PasteConcrete DurabilityDeterioration Of Reinforced Concrete
Although the damaging effect of carbonation on the durability of concrete is well known, it was only in 1982 that the physico-chemical effects were referred to in a British standard on the structural use of concrete, which covered the effects of carbonation and chlorides. The results of carbonation of concrete are shrinkage and the neutralization of the alkaline conditons of the hydrated cement paste. Under normal conditions the carbonation rate of concrete is low and is indicated by a table showing carbonation time for various depths of cover and w/c ratios. If concrete is carbonated to the full depth of cover then reinforcing steel is no longer protected by an alkaline environment and so rusting can occur. If chloride ion concentration is low and carbonation does not extend to the reinforcement then the use of a protective surface coating to stop further carbonation can be considered. (TRRL)