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      CRACK HEALING UTILISING BACTERIAL SPORES IN CONCRETE

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          Abstract

          This self repair system is based upon harmless ground borne bacteria as the self-healing agent. The bacteria are activated after the concrete is cracked and the bacterial spores are exposed to moisture and air. The bacterial reproduction process creates a calcite by-product which fills the cracks in the concrete. By sealing the cracks in concrete, an effective barrier to air or liquid borne deleterious materials are formed and as a consequence of this, enhanced durability is achieved in the structure, resulting in lower life cycle costs.

          The concrete/mortar prisms were cracked and tested for water flow. They were then left for 56 days to heal and were subject to a test for water tightness. Healing was observed and a reduced water flow (74% and 32% healed) measured with the healed samples when compared to the specimens that were cracked and subjected to a water flow test without any healing agent. The number of samples were limited and a larger scale test is recommended for further work; however, this is a proof of concept of the process of healing and testing.

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          Most cited references 9

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          “Biocalcification by Bacillus pasteurii urease: a novel application.”

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            “Characterization of urease and carbonic anhydrase producing bacteria and their role in calcite precipitation.”

             V. Achal,  X Pan,  X. PAN (2011)
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              “Evaluation of experimental methodology to assess the sealing efficiency of bacteria based self healing mortar: Round robin test.”

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                Author and article information

                Journal
                jgrb
                Journal of Green Building
                College Publishing
                1552-6100
                1943-4618
                1943-4618
                Summer 2017
                : 12
                : 3
                : 101-114
                Author notes

                1–4. Northumbria University, 510 Wynne Jones, New Castle upon Tyne, NE1 8SA United Kingdom, alan.richardson@ 123456northumbria.ac.uk

                Article
                jgb.12.3.101
                10.3992/1943-4618.12.3.101
                © 2017 College Publishing
                Page count
                Pages: 14
                Product
                Categories
                INDUSTRY CORNER

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