| Title |
Evaluation of the Mechanical Properties and Microstructure of Fiber-Reinforced Non-Hydraulic Calcium Silicate Cement Mortar under Carbonation Curing |
| Authors |
최창근(Choi, Chang-Keun) ; 심상락(Sim, Sang-Rak) ; 류동우(Ryu, Dong-Woo) |
| DOI |
https://doi.org/10.5659/JAIK.2026.42.10.395 |
| Keywords |
Low-Lime Calcium Silicate Cement; Non-Hydraulic; Mineral Carbonation; Carbonation Curing; Fiber |
| Abstract |
This study investigates the intentional formation of CO2 diffusion pathways through the cement paste-fiber interface by incorporating
polypropylene fiber (PPF) and cellulose fiber (CF), which have different wettability characteristics, into non-hydraulic calcium silicate cement
paste and mortar. Mechanical properties and microstructural changes under carbonation curing conditions were also evaluated. The results
indicate that CO2 diffusion and reaction behavior vary according to fiber wettability, although the overall trends remain similar despite the
partial reduction of the fiber-induced CO2 diffusion effect caused by the presence of aggregates. During carbonation curing, the hydrophobic
PPF promotes the inward diffusion of CO2 through the cement paste?fiber interface, resulting in the highest degree of carbonation. However,
it exhibits the lowest compressive strength because the relatively weak interfacial bonding is not sufficiently compensated by microstructural
densification. In contrast, CF shows limited compressive strength development at early ages because fiber swelling restricts CO2 diffusion at
the interface. At later ages, however, moisture release enhances CO2 diffusion, while the superior interfacial bonding promotes carbonation
reactions and microstructural densification, resulting in the highest compressive strength. These findings suggest that incorporating fibers into
cement-based materials can improve carbonation reactions and mechanical performance depending on fiber wettability. |