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Indicators of carbonation resistance in concretes with supplementary cementing materials
DOI:
https://doi.org/10.5216/reec.v20i1.80502Keywords:
Concrete, Carbonation, Supplementary cementing Material, Alkaline Reserve, PorosityAbstract
ABSTRACT: Concretes produced with the partial replacement of Portland cement by supplementary cementitious materials (SCM's) are common and guarantee economic, sustainable benefits and increased performance and durability of concretes. However, replacing clinker with another type of material reduces the alkaline reserve of the system, which is an aggravating factor for reinforced concrete, as the high alkalinity of the medium guarantees the formation of a passive layer around the steel, preventing the start of the corrosion process. The knowledge of carbonation mechanisms in composite systems is essential when dosing concrete, enabling the choice of the appropriate type and content of SCM's. The present work considers the need to make a balance between the damage caused to the chemical barrier by the reduction of the alkaline reserve, and the improvement of the physical barrier through the reduction of porosity, caused by SCM's, to guarantee the good durability of concrete subject to carbonation and proposes the use of an indicator of resistance to carbonation depending on the calcium and silica content present in the materials.
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