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CONCRETE TECHNOLOGYwww.cpi-worldwide.com CPI %u2013 Concrete Plant International | India Edition %u2013 1 | 2026 23ference of the specimens, and the average value reported as the test result. Results and discussions Durability IndexesThe durability indices can be used to characterise the quality of concrete with different types of binder and binder proportions. Table 2 provides suggested ranges for durability index classification.Figure 1a presents the coefficient of permeability (k) of the LC3 mixes, with the corresponding OPI values (which are the negative log of the k values) in Figure 1b. All mixes have k-values less than 1 m/s (or OPI values > 10) indicating dense, low permeability concretes, and thus high physical resistance to penetration of gases such CO2. However, the LC3 mixes Table 2: Suggested ranges for durability classification [13].OPI (log scale) CCI (mS/cm) Durability class>10 <0.75 Excellent9.5-10 0.75-1.50 Good9.0-9.5 1.50-2.50 Poor<9.0 >2.50 Very poorSorptivity (mm/%u221ah) Porosity (%)<6 <10 Excellent6-10 <10 Excellent to Good>10, <12 Good to Poor10-15 <12 Good to Poor>12, <15 Poor to Very poor>15 %u2013 Very poor