Re-Fer

re-bar is fixed to the roughened substrate using sprayed mortar. The new mortar replaces the old, damaged and possibly carbonated concrete layer and also serves as a new alkali deposit. The reinforcement work can be integrated into measures that are necessary anyway.

In grouting or reprofiling mortar: re-bar is applied either over the entire area or in milled grooves only. The active reinforcement of negative moments is used for balconies, industrial and private buildings, or bridge slabs.

The activation of re-bar is also possible with electrical resistive heating.

When strengthening concrete beams, the anchoring zone can be made more robust with stirrups. Like this, tensile forces are transferred to the concrete compression zone and the shear resistance is increased.

The advantages of the easy-to-apply shear reinforcement in terms of serviceability are comparable to those of bending reinforcements. The release in stresses in the internal shear stirrups has been experimentally proven (see tests on T-beams).

This type of reinforcement can be useful for high expansion forces and increasing cracks. re-bar is also used for new cut-outs or cantilevered concrete walls.

The combination with bent and glued-in end hooks is possible.

For small deficits in punching shear resistance, re-bar can be used to increase the amount of negative bending reinforcement. The bars are designed with end hooks. The advantage of this solution is that the additional reinforcement is immediately active and has a similar stress level to the internal reinforcement. In addition, re-bar is very ductile.

Prestressed confinements act radially against the water pressure. Thanks to the actively load-bearing re-bars, crack openings can be limited. The system also allows the forces to be evenly distributed and does not require large anchor heads.

The memory^®-steel strengthening solution should always be used where it has structural benefits, for instance to cover service loads. CFRP laminates or carbon fibre fabrics are subsequently used to cover the remaining gap to fulfil the load-carrying capacity (bending and shear) at ultimate load state.

For additional utilisation of all reinforcement systems, concrete structures can be relieved in advance with hydraulic presses.

The re-bar system provides a simple solution for the seismic reinforcement of masonry walls. The bars are placed vertically or diagonally into cut grooves and anchored in the neighbouring concrete slabs (floor/ceiling). The prestressing forces put the walls under controlled compression, which increases the shear and bending resistance in the event of an earthquake.

Simple anchoring solutions can also be found for thin concrete slabs. The measure has minimal space requirement (no anchor heads) and can be installed individually for each floor.

Inhomogeneous settlement or cracks often occur in stone walls of old buildings. re-bar can also be used to prevent further crack propagation. Damaged lime mortar joints can be repaired.

In old buildings, filigree hollow-core slabs (e.g. cementitious Hourdis elements) can be found in many places. Their maintenance is extremely difficult. Under certain circumstances, reinforcements with re-bar and a reduced, controlled heat supply are feasible.

re-plate is suitable for flexural reinforcement. If the structure without strengthening measure is insufficient in the case of fire, re-plate must be protected. The cost-effective fire protection spray plaster SikaCem^® Pyrocoat has been tested and approved for such applications. Comparatively thin layer thicknesses are required.

The memory^®-steel strengthening solution is actively load bearing already under constant service loads. Remaining ultimate bending moments can also be covered with conventional CFRP strips. Together with the fire protection SikaCem^® Pyrocoat, economical solutions can be found.