Concrete is the most widely used construction material in the world, and its use is projected to increase even more in the future. However, the production and use of concrete in the construction industry generates huge amounts of CO2 emissions with currently used technology. The construction of concrete structures will also be made more difficult in the future because the aggregate traditionally used to make concrete is becoming increasingly difficult to obtain. Aggregate is a non-renewable raw material, its supplies are depleting and its extraction is increasingly energy-intensive and environmentally damaging. Because existing concrete structures deteriorate over time, they will inevitably have to be demolished and end up as demolition waste. The disposal of concrete waste has also become a significant environmental problem, with the amount of concrete waste from the construction industry going to landfill increasing every year. For these reasons, a solution for the proper treatment and recycling of construction concrete waste is of increasing importance to society and the technological process of solving this problem should become a standard undertaking for the civil engineering profession. For a wide range of industrial applications of recycled concrete, it is necessary to increase the performance of concrete products made from recycled ingredients. This not only concerns strength properties but also other characteristics such as durability and workability. To optimize the manufacturing process, it is necessary to improve the preparation and testing methodology prior to the concrete mix design. Based on the measurable properties of a given concrete waste raw material, even in the pre-processing stage, the composition of the recycled concrete mix can be optimized for specific applications. This chapter describes the applied testing and design methodology for a case study in Hungary and shows the potential structural applications of the recycled concrete produced.