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Table 3 Physical and mechanical properties of sandstone and limestone samples treated with the functionalized silicone (S) and acrylic (AC) polymers

From: Antimicrobial potential of consolidation polymers loaded with biological copper nanoparticles

Physical and mechanical properties Sandstone Limestone
Untreated stones AC/CuNPs S/CuNPs Untreated stones AC/CuNPs S/CuNPs
Bulk Density (g/cm3) 1.6 ± 0.3 1.9 ± 0.4* 1.8 ± 0.2 1.9 ± 0.3* 2.2 ± 0.2** 2.1 ± 0.3*
Water Absorption (%) 19.8 ± 1.9 14.3 ± 1.7* 3.6 ± 0.4** 8.4 ± 1.1** 6.4 ± 0.5** 2.3 ± 0.2**
Porosity (%) 26.3 ± 2.5 18.7 ± 2.2* 4.3 ± 0.3** 15.6 ± 1.5* 9.7 ± 0.8** 4.4 ± 0.4**
Compressive strength (MPa) 19.8 ± 1.6 28.3 ± 1.9** 26.9 ± 2.7** 26.9 ± 2.2** 39.8 ± 2.7** 32.5 ± 1.7**
Tensile Strength (MPa) 3.2 ± 0.6 4.9 ± 0.4** 4.2 ± 0.6 4.3 ± 0.7* 5.3 ± 0.4** 4.9 ± 0.5**
  1. Statistical significance of differences compared to untreated stones: *, significant at P < 0.05; **, significant at P < 0.01
  2. Data are the means of three replication ± standard errors