The objective of this study is to further develop an innovative performance-based mixture proportioning method by analyzing the

In practice, and flexible in terms of allowing a wide range of material selection. The proposed method should be user friendly, easy to apply To provide the desired concrete properties for a given project specification. Therefore, a performance-based mixture proportioning method is needed Of materials yet do not compromise engineering performance. As budgets grow tighter and increasing attention isД«eing paid to sustainability metrics, greater attention is beginning to be focused on making mixtures that are more efficient in their usage Proportions based on the needs of the mixture and the locally available materials. Mixture proportioning is routinely a matter of using a recipe based on a previously produced concrete, rather than adjusting the It is possible to reduce the cement content, ensuring its efficient use, while still attaining the required durability and strength properties. 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. A second study based on determining the effects of reducing the cement content on the properties of concrete (strength and durability) is also provided. The material provisions, strength and durability indicators are considered and discussed. 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 performance-based approach developed and used in South Africa is based on the durability index (DI) tests. 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 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. To ensure efficient utilization of resources (sustainable construction) there is a need to construct durable RC structures. The extensive deterioration of reinforced concrete (RC) structures in the recent past has raised worldwide concerns.

7 days to die reinforced concrete