Until now, the construction of waterproof concrete foundations (in the presence of groundwater) has always required compromises between crack resistance and an efficient and environmentally friendly construction method. The aim of a research project at the Munich University of Applied Sciences (MUAS) was to combine these aspects by means of a new approach, thus enabling a construction method both reliable and economical. For this purpose, a new crack inducing element was developed, which combines the process-optimized properties of nominal crack inducing elements with the crack safety of decoupled systems by means of an active pressure development (using swelling agents) during the setting process of the concrete. The swelling process is planned to start before tensile stresses develops in the young concrete and ensures a decoupling in the crack area to form a static joint. The surrounding concrete next to the crack element is getting compressed and thus an upper reinforcement layer to reduces the crack widths becomes obsolete. The resulting requirements were also to be used to rethink the previous structural engineering and concrete technology approaches and thus create a holistic solution. This includes a permanently chloride-resistant reinforcement concept made of basalt fiber reinforced polymers in the crack area as well as the development of a chloride-resistant concrete with high frost durability outside of the transition element. The experimental investigations carried out at the MUAS showed that the swelling behavior could be controlled in a targeted manner and thus a defined crack width could be initiated on the basalt-reinforced Induced Swelling Transition Element (IST-Element).

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Induced Swelling Transition Element (IST-Element)

  • Daniel S. Glomb,
  • Christoph Dauberschmidt

摘要

Until now, the construction of waterproof concrete foundations (in the presence of groundwater) has always required compromises between crack resistance and an efficient and environmentally friendly construction method. The aim of a research project at the Munich University of Applied Sciences (MUAS) was to combine these aspects by means of a new approach, thus enabling a construction method both reliable and economical. For this purpose, a new crack inducing element was developed, which combines the process-optimized properties of nominal crack inducing elements with the crack safety of decoupled systems by means of an active pressure development (using swelling agents) during the setting process of the concrete. The swelling process is planned to start before tensile stresses develops in the young concrete and ensures a decoupling in the crack area to form a static joint. The surrounding concrete next to the crack element is getting compressed and thus an upper reinforcement layer to reduces the crack widths becomes obsolete. The resulting requirements were also to be used to rethink the previous structural engineering and concrete technology approaches and thus create a holistic solution. This includes a permanently chloride-resistant reinforcement concept made of basalt fiber reinforced polymers in the crack area as well as the development of a chloride-resistant concrete with high frost durability outside of the transition element. The experimental investigations carried out at the MUAS showed that the swelling behavior could be controlled in a targeted manner and thus a defined crack width could be initiated on the basalt-reinforced Induced Swelling Transition Element (IST-Element).