Fibers(Poly propylene)

4) Plastic limit of Black cotton soil with 3% Sodium silicate Sample Number 1 2 3 Mass of emptycontainer (M1) gm 19.65 20.71 18.54 Mass ofcontainer + wet soil (M2) gm 49.89 50.16 49.26 Mass of container + drysoil (M3) gm 40.70 41.22 39.94 Water content (%) 43.66 43.59 43.55 Plastic limit 43.60 Table: 26

5) Plastic limit of Black cotton soil with 4.5% Sodium silicate Sample Number 1 2 3 Mass of emptycontainer (M1) gm 18.49 19.62 20.33 Mass ofcontainer + wet soil (M2) gm 49.07 50.33 51.35 Mass of container + drysoil (M3) gm 38.35 39.59 40.56 Water content (%) 53.98 53.78 53.34 Plastic limit 53.70 Table: 27

6) Plastic limit of Black cotton soil with 6% Sodium silicate Sample Number 1 2 3 Mass of emptycontainer (M1) gm 18.49 19.26 20.22 Mass ofcontainer + wet soil (M2) gm 50.47 51.34 52.72 Mass of container + drysoil (M3) gm 39.82 40.60 41.62 Water content (%) 49.92 50.33 51.87 Plastic limit 50.71 Table: 28

G. Plasticity Index of Black cotton soil IP = WL – WP = 62.50-36.49 ⸫IP=26.01% 1) Plasticity Index of Black cotton soil with 2% RBI Grade 81 IP = WL – WP = 60-37.90 ⸫IP=22.10% 2) Plasticity Index of Black cotton soil with 4% RBI Grade 81 IP = WL – WP = 59.50-38.77 ⸫IP= 20.73% 3) Plasticity Index of Black cotton soil with 6% RBI Grade 81 IP = WL – WP = 57.50-36.64 ⸫IP=20.86% 4) Plasticity Index of Black cotton soil with 3% Sodium silicate IP = WL – WP = 61-43.60 ⸫IP=17.40% 5) Plasticity Index of Black cotton soil with 4.5% Sodium silicate IP = WL – WP = 65-53.70 ⸫IP=11.30% 6) Plasticity Index of Black cotton soil with 6% Sodium silicate IP = WL – WP = 59-50.71 ⸫IP=8.29%