Bacilli 1 Bacillus Subtilis 1 Bacillus subtilis 1 Bacteriology 1 Bio concrete 1 Bonded silica 1 C-S-H gel Calcium 1 Calcium hydroxide solution 1 Calcium silicate 1 Cell walls 1 Cells 1 Cement hydration 1 Cements 1 Chemically modified 1 Compressive strength 1 Concrete environments 1 Concrete specimens 1 Ethylene diamine 1 Gels 1 Hydrated lime 1 Hydration 1 Hydration of cements 1 Hydration process 1 Low permeability 1 Microbial 1 Optimum concentration 1 Pozzolanic materials 1 Silica fume 1 Silica precipitation 1