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# Table 1 Various durability estimators reported in the literature

From: A review of theoretical salt weathering studies for stone heritage

Durability estimator | Parameters used in durability estimation | Comments (merits and demerits for determination of index) | |
---|---|---|---|

Richardson (1991) | Durability factor, \( D={C}_s^2P \) | Saturation coefficient ( | For determination of this index, only easy-measurement parameter (porosity) of solid (rocks) is enough, although chemical analysis of saline solution is necessary. |

Moh'd et al. (1996) | Durability estimator, x = [( | Total porosity ( | Fairly complex methods (determination of pore size distribution and chemical analysis of saline solution) are necessary. |

Matsukura and Matsuoka (1996) | Weathering susceptibility index, \( WSI=\frac{P_c}{S_t} \) | Calculated crystallization pressure based on pore size distribution and pore radius ( | No chemical analyses for saline solution but strength test of solids (rocks) are necessary. The parameter can consider variable tensile strength of rocks. |

Ordóñez et al. (1997) | Durability dimension estimator, \( DDE=\sum \frac{v(r)}{r}{P}_{conc} \) | Pore size distribution, pore radius ( | Only one method (porosimetry) is enough to determine this index. |

Benavente et al. (2004a) | Petrophysical durability estimator, \( PDE=\frac{X}{\sigma } \) | Estimators based on pore structure ( | It is easy to consider because of simple equation. |

Angeli et al. (2007) | Alteration index (AI) estimator, \( {AI}_{estim}=\ln \left(\frac{100C}{E\sqrt{\sigma_T}}\right) \) Alteration velocity (AV) estimator, | AI: Capillary coefficient ( AV: | This parameter reflects three kinds of conditions (pore size, evaporation, and rock strength) of salt weathering. |

Salt Susceptibility Index, |
| Only one method (porosimetry) is enough to determine this index. |