Primed alkali-resistant A.R. glass 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 stone, brick, tuff and mixed masonry structures in order to improve the resistance and the overall ductility.

Mapegrid G 220 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 replacing existing structures, the system works in parallel with them without altering the way the masses and rigidity within the structures are distributed.

The latter is a very important aspect, particularly in the field of seismic design, where stresses are proportional to the masses involved.

The system follows the approach defined by the guidelines for the approval of FRCM (Fibre Reinforced Cementitious Matrix) systems.

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

Features & Benefits

• A special square mesh made from primed, alkali-resistant A.R. glass fibres with a zirconium dioxide content of more than 16% which, thanks to its special weave, when applied on masonry structures, makes up for their lack of tensile strength and increases their overall ductility so that stresses are distributed more evenly
• As a result, 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 its mechanical properties 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
• Excellent tensile strength
• Stable and resistant to chemical aggression from cement
• Resistant to atmospheric agents
• High dimensional stability
• High durability and stability within the inorganic matrix
• Limited intrusiveness concerning the aesthetical appearance of the existing structure
• Does not rust
• Light and easy to handle
• Easy to cut and adapt to the shape of the substrate

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 efficiency 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.