Abstract
This chapter is concerned with the use of natural pozzolans and recycled aggregates in the production of concrete materials. The natural pozzolan is normally used as partial replacement of cement and the recycled aggregates are partial or full substitute of natural aggregates. After a brief introduction, the chapter starts with reporting the rheological properties of concrete containing natural pozzolan and recycled aggregates. The effect of the fineness of natural pozzolan on fresh properties is considered. Various fresh properties are considered including slump, slump flow, J-Ring, V-funnel, and L-Box tests. The mechanical properties of concrete using the abovementioned materials are stated after the fresh properties section. Mechanical properties cover the compressive and flexural strength, elastic modulus, and shrinkage. This is then followed by the durability properties section which include permeability, carbonation, chloride penetration, sulfate attack, alkali–silica reaction, porosity, and microstructure. Before the main conclusions, there is a small section on environmental and economical aspects related to the use of pozzolanic and recycled materials in concrete applications.
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