IMPACT OF BIOGENIC SELF-HEALING ADDITIVE ON PERFORMANCE OF CEMENT-BASED MORTAR

Author(s): Ali Amiri, Zeynep Basaran Bundur
Paper category: Proceedings
Book title: proceedings of the International RILEM Conference on Materials, Systems and Structures in Civil Engineering Conference segment on Service Life of Cement-Based Materials and Structures
Editor(s): Miguel Azenha, Ivan Gabrijel, Dirk Schlicke, Terje Kanstad and Ole Mejlhede Jensen
ISBN:978-2-35158-171-4
e-ISBN: 978-2-35158-173-5
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 493-502
Total Pages: 10
Language : English

Abstract: Microcracks are one of the main reasons for a decrease in service life in concrete structures.
Recent research in the field suggested that it might be possible to develop a cement-based
material that is capable of remediate cracks by triggering biogenic calcium carbonate
(CaCO3). This paper summarizes the study undertaken to investigate the application of
vegetative Sporosarcina pasteurii (S.pasteurii) cells to remediate flexural cracks and impact
of biogenic self-healing agent on composition and strength of cement-based materials. To
develop biogenic self-healing agent, vegetative S. pasteurii cells were grown in urea- corn
steep liquor (UCSL), and then mixed with cement and sand. Incorporation of cells as well as
the nutrient media to the bacterial mortar did not affect the compressive strength negatively,
however substantial retardation was observed in initial setting of samples prepared by UCSL
medium and bacteria. The influence of superplasticizers and air entraining agents (AEA) on
biogenic CaCO3 precipitation was also investigated. The results indicated that use of industrial
waste CSL and bacteria, resulted biogenic CaCO3 are compatible with commercially used
admixtures, which can be potentially used for self-healing applications in cement-based
mortars.

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00