Table 1.
Oxide and mineral compositions of raw materials.
Fig 1.
Grain size distribution of raw materials.
Table 2.
The mix ratio of CO2 carbonated backfill materialsa).
Fig 2.
Overall workflow of the study.
Table 3.
Synthesized NaCl and Na2SO4 deterioration water (wt%).
Fig 3.
The concentration of chloride and sulfate ions (a) 3d, (b) 7d, (c) 14d, (d) 28d, and (e) 56d.
Fig 4.
Leaching concentration within exposed solution (a) Ca ion, (b) Si ion, and (c) Al ion.
Fig 5.
Evolution of (a) Mass and (b) diameter under different exposure conditions.
Fig 6.
Influence of various exposure conditions on (a) compressive strength, (b) strength reduction.
Fig 7.
SEM images and representative dispersive spectroscopy (EDS) spectra of carbonated backfill samples after various exposures.
Fig 8.
Porosity of backfill materials after exposure to various solutions.
Fig 9.
XRD diffraction peaks of carbonate backfill materials after exposure to various solutions.