Abstract

Today due to increase in demand of durable building materials, there is requirement of efficient techniques to augment the physico-mechanical properties of cementitious materials. Biocementation or Microbially Induced Calcium Carbonate Precipitation (MICCP) is an aspiring technique in Civil Engineering for increasing structure durability. Some species of bacteria in nature have an ability to precipitate calcium carbonate (CaCO3), a phenomenon called biocementation. In this work, the effect of bacterial solution using soil as a bacterial source on mechanical properties of cement and concrete were studied. The cost of the nutrient medium used for growing the bacteria was reduced by using lentil seeds instead of peptone and sugar instead of glucose as source of protein and carbon respectively. An increment in compressive strength of bio-cement and bio-concrete specimens for 28 days curing was found to be 23% and 25% respectively. A significant reduction in water absorption of the experimental specimens was observed when compared with the control specimens.

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