A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Biological repair of damaged concrete and mortar surfaces: biomineralisation
A recent development in the repair of the surfaces of natural stone monuments is biomineralisation. The process of biomineralisation results in the formation of a superficial calcareous ('biocalcin') coating, composed mainly of encrusted bacterial bodies mixed with carbonate excretates. In this paper, the investigation of the possibility of a biomineralisation technology for concrete and mortar surfaces will be discussed. The objectives are to investigate the possibilities for calcium carbonate (CaCO3) precipitation on concrete and mortar surfaces by studying the material properties (chemical, structural and textural) of the new biominerally adapted surface layer. The formation of biominerals is studied on macro- and microscopic scale: the crystal structure and composition are examined using light- and scanning electron microscopy; the surface permeability is estimated through water absorption from a Karsten-pipe and the surface roughness is measured by laser sensors. In a parallel investigation, the application of potassium carbonate (K2CO3) to inverse gypsum, formed on the concrete surface by SO2 and humidity, back into CaCO3 is studied. This method was already tested on smooth sulphated surfaces on the Acropolis monuments. Different preparations of the concrete specimens were tested: spraying K2CO3, spraying K2CO3 after rinsing with water and completely immersing in K2CO3. The material properties of the newly formed surface layer were investigated in the same way as the biomineral surface layer. A clear difference before and after treatment is seen by biological as well as by chemical repair. Further investigations (durability, adhesion and thickness of the new formed layer, ...) are necessary to determine the quality of this repair.
Biological repair of damaged concrete and mortar surfaces: biomineralisation
A recent development in the repair of the surfaces of natural stone monuments is biomineralisation. The process of biomineralisation results in the formation of a superficial calcareous ('biocalcin') coating, composed mainly of encrusted bacterial bodies mixed with carbonate excretates. In this paper, the investigation of the possibility of a biomineralisation technology for concrete and mortar surfaces will be discussed. The objectives are to investigate the possibilities for calcium carbonate (CaCO3) precipitation on concrete and mortar surfaces by studying the material properties (chemical, structural and textural) of the new biominerally adapted surface layer. The formation of biominerals is studied on macro- and microscopic scale: the crystal structure and composition are examined using light- and scanning electron microscopy; the surface permeability is estimated through water absorption from a Karsten-pipe and the surface roughness is measured by laser sensors. In a parallel investigation, the application of potassium carbonate (K2CO3) to inverse gypsum, formed on the concrete surface by SO2 and humidity, back into CaCO3 is studied. This method was already tested on smooth sulphated surfaces on the Acropolis monuments. Different preparations of the concrete specimens were tested: spraying K2CO3, spraying K2CO3 after rinsing with water and completely immersing in K2CO3. The material properties of the newly formed surface layer were investigated in the same way as the biomineral surface layer. A clear difference before and after treatment is seen by biological as well as by chemical repair. Further investigations (durability, adhesion and thickness of the new formed layer, ...) are necessary to determine the quality of this repair.
Biological repair of damaged concrete and mortar surfaces: biomineralisation
Heirman, G. (author) / Herremans, T. (author) / Vangheel, T. (author) / Gemert, D. van (author) / Graef, B. de (author) / Belie, N. De (author) / Windt, W. de (author) / Verstraete, W. (author)
2003
8 Seiten, 2 Bilder, 2 Tabellen, 11 Quellen
Conference paper
English
Biological Repair of Damaged Concrete and Mortar Surfaces: Biomineralisation
| British Library Conference Proceedings | 2003
Repair mortar and repair construction method for damaged part of concrete structure
| European Patent Office | 2020