Project: Groninger Forum
Product: Self-healing Repair Mortar MR3
Size: Few meters of crack
The Groninger Forum is realized with an excavation of diaphragm walls. The diaphragm walls will remain within sight of users. The car park comprises five storeys underground, which particularly in the lower floor results in high groundwater pressure. At various locations sweat stains and smaller leaks are visible by micro cracking. As a result, in consultation with the implementation team on site, it was decided to stop these leaks by applying the newly developed self-healing repair mortar. The pilot was carried out in late August 2015.
The crack is first cut to approximately 50 mm deep to achieve sufficient bonding surface. Then a Fast setting cement was applied into the open cracks to minimize the influx of water. Immediately after the drying of the fast setting cement the Self-healing Repair Mortar was applied. Because of the low-shrinkage properties of this mortar a good adhesion with the underlying concrete was achieved. By the addition of fibers to the mortar the occurring tensile stress – as a result of the water pressure after setting – is more uniformly distributed, resulting in reduced micro-cracking. The present limestone-forming bacteria in the mortar could effectively seal (after hardening slightly present) micro-cracks. Ten weeks after the application of the Self-healing Repair Mortar in the previously existing cracks appeared watertight.