Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages

摘要

The objective of this work is to show the effect of carbonation at early stages on\udfiber–cement composites and impact on hydration, chemical and dimension\udstability. Carbonation increased the content of CaCO3 polymorphs and consumed\udCa(OH)2 and other hydrated calcium phases. Micrographs and energydispersive\udspectrometry showed the CaCO3 formed is precipitated in the pore\udstructure of the matrix, decreasing diffusion of Si, S, and Al during hydration.\udTherefore, a refining process of pore sizes is produced, and fiber–matrix interface\udin carbonated composites was improved, leading to volume stabilization of\udthe composite, as indicated by lower drying shrinkage and lower porosity.