QUALITY CONTROL OF REINFORCED CONCRETE STRUCTURES FOR DURABILITY

Author(s): Nganga, G. W., Alexander, M. G. and Beushausen, H. D.
Paper category: Conference
Book title: XIII International Conference on Durability of Building Materials and Components - XIII DBMC
Editor(s): Marco Quattrone, Vanderley M. John
Print ISBN: none
e-ISBN: 978-2-35158-149-0
Publication year: 2015
Pages: 1006-1014
Total Pages: 9
Language: English

Abstract: The extensive deterioration of reinforced concrete (RC) structures in the recent past has raised worldwide concerns. To ensure efficient utilization of resources (sustainable construction) there is a need to construct durable RC structures. The current quality control approach of measuring strength of standard specimens such as cylinders or cubes is inadequate as it is not directly related to durability. Concrete cover quality can be reliably assessed through the use of a performance-based approach which also allows for flexibility in selection of materials by the concrete producer on the condition that the required performance is complied with. The performance-based approach developed and used in South Africa is based on the durability index (DI) tests. A review of implementation of the specifications in the production of precast median barriers which were used in a large scale infrastructure project in Gauteng Province is provided. The material provisions, strength and durability indicators are considered and discussed. A second study based on determining the effects of reducing the cement content on the properties of concrete (strength and durability) is also provided. From the two studies, it is shown that high binder content may result in high strength which does not necessarily ensure compliance with durability requirements. It is possible to reduce the cement content, ensuring its efficient use, while still attaining the required durability and strength properties.

Online publication: 2015
Publication Type: full_text
Public price (Euros): 0.00