PREPARING OF BIO-CEMENT MORTAR BY USING BACILLUS LICHENIFORMIS BACTERIAL CELLS

Abstract

The incorporation of microbial-induced carbonate precipitation (MICP) in cement mortar is a good idea toward sustainable development. This study discussed the effect of adding MICP (Bacillus licheniformis urease bacteria) to cement mortar in different ways. Spray and admixed treatment with different bacterial concentration (optical density). The results proved that the addition of these microorganisms resulted in 17–37% increase in the compressive strength of cement mortar compared with control mix; this increment can be attributed to the deposition of calcium carbonate in the pores of cement mortar matrix. The results showed an increment of approximately 37% and 21% in the compressive strengths of the cement mortar admixed with 1 O.D and 0.5 O.D, respectively, on sequential culturing in comparison with the control mix. Moreover, the treatment of the cement mortar with the bacterial culture spray at 1 O.D resulted in 17% improvement in the compressive strength when compared with that of the control mix