Akademik Veri Yönetim Sistemi
Conference Safe, Sustainable and Swift Reconstruction of Ukraine, Lviv, Ukrayna, 19 - 20 Mart 2026, ss.1, (Özet Bildiri)
Conventional
carbonation approaches often remain inadequate for fully exploiting the
reactive potential of recycled concrete fines (RCF), mainly due to slow
reaction rates and limited CO₂ utilisation. This study explores an alternative
mechanochemical carbonation (MC) route in which dry ice is used directly as the
solid CO₂ donor. Throughout the MC treatment, the transformation of mineral
phases, the evolution of carbonation kinetics, and the accompanying
microstructural reorganisation of RCF were systematically investigated. The
reactivity of the carbonated material was assessed through the R3 protocol to
determine its suitability as a supplementary cementitious component.
Under
the optimised MC conditions, pastes prepared with CEM IV cement reached a CO₂
uptake capacity of 0.26 and an overall utilisation efficiency of 56%,
demonstrating rapid and effective carbonation within a markedly short reaction
window. These outcomes represent a substantial advancement compared with
conventional wet or dry carbonation routes, which generally require
significantly longer durations to achieve comparable incorporation levels.
The
enhanced performance observed in MC-treated RCF is attributed primarily to
mechanical activation effects that disrupt particle agglomeration, expose fresh
reactive surfaces, and facilitate CO₂ diffusion into the mineral matrix. This
combination of mechanisms promotes accelerated decalcification–recarbonation
pathways and results in the formation of finely distributed carbonate phases.
Furthermore, the concurrent generation of amorphous silica-rich gels during MC
treatment markedly improved the pozzolanic behaviour of the RCF, as confirmed
by increased bound water values in the R3 test.