Self-healing of bio-cementitious mortar incubated within neutral and acidic soil

Abstract The efficiency of bio self-healing pre-cracked mortar specimens incubated in sand was investigated. investigation examined the effect soil pH representing industrially recognised classes exposure, ranging from no risk chemical attack (neutral ? 7) to very high (pH 4.5). Simultaneously, subjected fully and partially saturated cycles for 120 days resemble groundwater-level fluctuation. Bacillus subtilis with nutrients were impregnated into perlite utilised as a bacterial healing agent. agent added half comparison purposes. Mineral precipitations observed both control bio-mortar specimens, products by SEM–EDX scanning. ratio evaluated comparing (1) repair rate crack area (2) capillary water absorption sorptivity index—before after incubation. results indicated that bacteria-doped (bio-mortar) exhibited most efficient crack-healing all incubation conditions i.e. different exposure classes. In neutral soil, average ratios 38% 82%, respectively. However, decreased 43% acidic 4) compared 7). study implies is generally beneficial concrete embedded within soil; however, aggressive ground can inhibit process.