Evaluation of Tensile Strength and Durability of Microbial Cement Mortar
In this research, an attempt has been made to study the effect of adding the micro-organisms in cement mortar on its tensile strength. In addition to evaluating the durability of cement mortar with and without micro-organisms by studying the deterioration in tensile strength after sulfuric acid (H2SO4 with 6% concentration) attack.
The experimental work included casting four mixes (denoted by: case 1, case 2, case 3, case 4 and the control mixes) which differ according to the way of adding micro-organisms, casting water, curing water (or both).
Each mix contains three cylindrical specimens except case 4 and the control mix which contain six cylinders each. It was found that, when adding micro-organisms; the tensile strength was increased (i.e. all mixes gave a higher percentage of tensile strength) as compared with that of the control mix.
The results revealed that for the microbial cement mortar (case 4), the percentage of deterioration in tensile strength, was smaller [after the sulfuric acid H2SO4 (6% concentration) attacked the samples] than that of the control mix. It was also found that the effect of using bacterial additives on the percentage of increasing in tensile strength of cement mortar (case4 & control) is increased after sulfuric acid (H2SO4: 6% concentration) attack.
KeywordsMicro-organisms Bio-mineralization Microbial cement mortar Tensile strength and durability
- 5.Afifudin, H., Nadzarah, W., Hamidah, M.S., Noor Hana, H.: Microbial participation in the formation of Calcium Silicate Hydrated (CSH) from Bacillus subtilis. In: The 2nd International Building Control Conference (2011)Google Scholar
- 11.Ramachandran, S.K., Ramakrishnan, V., Bang, S.S.: Remediation of concrete using micro-organisms. ACI Mater. J. 98, 3–9 (2001)Google Scholar
- 12.Park, S.-J., Park, Y.-M., Chun, W.-Y., Kim, W.-J., Ghim, S.-Y.: Calcite-forming bacteria for compressive strength improvement in mortar. J. Microbiol. Biotechnol. 20(4), 782–788 (2010)Google Scholar
- 15.Achal, V., Mukherjee, A., Sudhakara Reddy, M.: Microbial concrete: a way to enhance durability of building structures. In: Second International Conference on Sustainable Construction Materials and Technologies June 28 - June 30, 2010, Università Politecnica delle Marche, Ancona, Italy (2010)Google Scholar
- 16.ASTM C 496–86: Standard test method for splitting tensil of cylindrical concrete specimens. Annual Book of ASTM Standards, 04(02), 259–262 (1989)Google Scholar
- 17.Seshagiri Rao, M.V., Srinivasa Reddy, V., Sasikala, Ch.: Performance of microbial concrete developed using bacillus subtilus JC3. J. Inst. Eng. India Ser. A (2017)Google Scholar