Ökobilanzierung von Beton mit 100 % rezyklierter Gesteinskörnung im Vergleich zu Normalbeton.

Life cycle assessment of concrete made of 100 % recycled aggregate compared to normal concrete The construction sector accounts for a significant proportion of the consumption of natural resources and is also the source of the largest waste streams. The aim must therefore be to improve the circular economy in the construction sector. In this context, the Institute for Materials and Building Research (IMB) at Munich University of Applied Sciences (HM) has investigated the use of recycled aggregates beyond the technical building regulations up to 100 % including recycled sand for the production of structural concrete. The first applications of concrete with 100 % recycled aggregate (100 % RC concrete) have already been completed and are presented in this issue. Based on the findings from the research and construction projects, life cycle assessments were performed in which 100 % RC concrete (circular system) was compared with normal concrete (linear system) for the application case C30/37 XC4/XF3 (CEM II/C‐M (S‐LL)). The life cycle assessments of the two product systems were prepared in the form of nomograms so that input parameters such as transport services can be adjusted and a graphical evaluation of GWP can be carried out. This makes it easy to elaborate recommendations for the use of 100 % RC concrete with regard to reducing the environmental impact (GWP) in specific applications based on the life cycle assessments carried out. Other cements can also be taken into account after a simple conversion. The analyses show that the circular system has a slightly lower GWP when assuming the same transport distances and the same cement content but a slightly higher superplasticizer content. [ABSTRACT FROM AUTHOR]