Primed alkali-resistant bidirectional basalt fibre mesh used in combination with Planitop HDM Maxi (two-component ready-mixed high ductility pozzolan-reaction fibre-reinforced cementitious mortar for structural “reinforced” strengthening of masonry structures) or Planitop HDM Restauro (two-component ready-mixed high-ductility fibre reinforced natural hydraulic lime (NHL) and Eco-pozzolan based mortar for structural “reinforced” strengthening of masonry structures) to strengthen reinforced concrete and masonry structures in order to improve their mechanical characteristics and overall ductility.

Mapegrid B 250 Mesh is part of the Mapei FRG System, a complete range of composite materials that use an inorganic matrix to guarantee excellent chemical-physical and elastic-mechanical compatibility with masonry substrates. This type of system offers several important advantages when used on buildings of historical or artistic interest. Rather than replace existing structures, the system works in parallel with them to help improve without altering the way the masses and rigidity within the structures are distributed. The latter is a very important factor, particularly in seismic areas where stresses are proportional to the masses involved. The use of Mapegrid B 250 in particular allows for better distribution of strains caused by cyclic loads.

The system, made up of special mesh and mortar, follows the approach defined by the guidelines for the approval of FRCM (Fibre Reinforced Cementitious Matrix) systems which stress the importance of obtaining approval for the entire strengthening package.

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• Features & Benefits
• Recommendations & Limitations
• Application & Preparation

Features & Benefits

• A special square-meshed net made from primed, alkali-resistant basalt fibres which, thanks to its special weave, increases the mechanical characteristics and ductility of the reinforced masonry and distributes stresses more evenly
• In the event of movements in the structure, the strengthening package has the ability to distribute stresses and strains over the entire surface of the members and elements strengthened with the mesh so that its failure mode is transformed from fragile type to ductile type
• The system adheres perfectly to the substrate and the mechanical properties of the bond formed are such that localised stresses always provoke a failure in the substrate rather than at the substrate/strengthening system interface
• In the case of strengthening applied to arched or vaulted elements, the masonry acquires the ability to resist tensile loads and inhibit the formation of plastic hinge points on the side opposite to where the strengthening package is applied
• There is also a lower consumption of energy during the production process of Mapegrid B 250, thereby guaranteeing less impact on the environment due to the limited amount of CO₂ emissions. In combination with Planitop HDM Restauro mortar to strengthen historical buildings it represents a particularly “eco-compatible” system
• Excellent tensile strength
• High resistance to cyclical loads
• Stable and resistant to chemical aggression from cement
• Resistant to atmospheric agents
• High dimensional stability
• Does not rust
• Light and easy to handle
• Easy to cut and adapt to the shape of the substrate
• Resistant to wear
• Limited amount of CO₂ emissions during the production process

Recommendations & Limitations

• In order to improve the anchoring mechanism of the strengthening system, strategically placed connectors made from MapeWrap Fiocco may also be applied (see relative Technical data Sheet) on the facing wall or on the imposts, keystones and around the springers of arched or vaulted members. The connectors eliminate any “debonding” phenomenon and increases the static effciency of the strengthening package applied. The number and pitch of the connectors is defined during the design phase.

Application & Preparation

Please refer to the data sheets in the tab above for further information.