| CG | coal gangue |
| Da | average diameter |
| DN | diameter when cumulative distribution reaching N% |
| FTIR | Fourier transform infrared spectroscopy |
| GBM | grouting backfill material |
| HB | hydrogen bonding |
| SP | superplasticizer |
| UCS | uniaxial compressive strength |
| XRD | x-ray diffraction |
| Gx | CG powder obtained by grinding for x min without admixtures |
| GxUy | CG powder obtained by grinding for x min with y% urea |
| CH | calcium hydroxide [Ca(OH)2] |
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