Circular economy for concrete pipes:
New pipes made of old pipes

Figure: Röser GmbH / FBS

Fig. 1: Circular economy for concrete pipes: New pipes from old pipes

Figure: Röser GmbH / FBS

Figure: Sika

Fig. 2: Visual comparison of the original aggregate with the recycled aggregate treated with the reCO₂ver process

Figure: Sika

Fig. 3: Comparison of the grain shape of original aggregate and recycled aggregate treated with the reCO₂ver process

Figure: Sika

Fig. 4: Laboratory results of granularity and compactability

Figure: Sika

Fig. 5: Comparison of fresh cylinders of the original pipe concrete with the selected concrete design made of reCO₂ver material with indication of additional water

Figure: Sika

Figure: FBS

Figure: Röser

FBS Röser Sika

Figure: Röser

Figure: Sika

Concrete and reinforced-concrete pipes can already be used as a source of recycled aggregate. However, a true circular economy would require the use of the highest possible proportion of recycled concrete rubble in pipe production. Here we present a pilot project. The article focuses on the problem and the findings obtained in laboratory tests.

Introduction

The sewer system is one of the most important elements of our built environment. It is the backbone of our health and contributes significantly to the performance of society. This is where the megatrends of urbanization and environmental protection give rise to major challenges. On the one hand, the sewer system must be durable to reliably fulfill its function. On the other hand, the building materials used must be recyclable to enable possible adaptation to population growth in a resource-saving manner.