Investigation of Best Practices for Maintenance of Concrete Bridge Railings : Research Project Capsule
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Investigation of Best Practices for Maintenance of Concrete Bridge Railings : Research Project Capsule

  • Published Date:

    2012-09-01

  • Language:
    English
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  • Edition:
    Research project capsule
  • NTL Classification:
    NTL-HIGHWAY/ROAD TRANSPORTATION-Bridges and Structures ; NTL-HIGHWAY/ROAD TRANSPORTATION-Construction and Maintenance ;
  • Abstract:
    Mildew growth and darkening of concrete bridge railings and structures have negative impacts on their aesthetic value and durability. Darkening and stains are created by growth of biofi lms such as algae, cyanobacteria, and fungi. As fungi grow, the metabolic process produces pigments staining the concrete. Furthermore, several species of fungi or bacteria excrete organic acids, degrading the concrete. These organic acids produce calcium complexes, which can separate from the concrete matrix, reducing the material weight, the porosity, and the permeability of the structure. In addition, concrete, which has a high roughness and macro-porosity, also has a high bio-receptivity. The environmental conditions near bridge railings and structures, such as dampness, warmth, sunlight, and carbon from vehicle pollution, are ideal for microorganism colonization and growth. Other researchers reported that the use of highlyabsorptive low durability coarse aggregates should be avoided in Portland Cement Concrete (PCC) for bridge railing applications.
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