CONSOLIDATING ARCHES AND VAULTS
Of all architectural elements, arches and vaults made of stone or brick, whether they are load bearing or not, are the most prone to degradation and stress caused by seismic events, changes in acting loads and foundation sinking, which cause the structure to lose its original mechanical properties. Because these elements are of great historic and architectural value, they need to be consolidated in a non-invasive, compatible and consistent way with regards to their special features.
Fibre Net developed two different methods of intervention:
- FRCM (Fiber Reinforced Cementitious Matrix): the “reinforced render” method, where GFRP meshes, connections and accessories are combined with preferably lime-based mortars to obtain a thin collaborating reinforcement capable of improving mechanical strength diffusely and homogeneously.
- FRP: fibre-reinforced sheeting method, where GFRP and CFRP fabrics are used for reinforcing individual spots, ideally recommended for oddly shaped arches and vaults.
Fibre Net systems help obtain efficient, non-invasive and reversible consolidation, where vaulted surfaces gain greater mechanical resistance, ductility and compatible stiffness, while keeping loads and thickness low. The systems guarantee long-lasting and efficient consolidation, because they are corrosion-proof and compatible with different types of mortars, e.g. lime, concrete, pozzolan, etc.
REINFORCED RENDER METHOD FOR RESTORATION WORKS
A most common problem affecting vaulted structures is the appearance of deformed layers owed to seismic events, structural breakdown or excessive loads, which cause dangerously unstable deep cracks to form. As the intrados of these surfaces are often painted or decorated, any non-transpiring materials must be avoided.
Consolidating vaults with reinforced render results in a very efficient and diffused intervention, as it guarantees greater mechanical strength to the whole vaulted structure.
The FIBREBUILD-FRCM system consists in laying onto the vault intrados or extrados a thin coat (about 3 cm thick) of low-module render mortars, preferably lime-based, reinforced with preformed GFRP meshes and connections.
This method promotes a diffused and homogeneous structural consolidation, featuring great mechanical properties, ductility, durability and low stiffness.
• LIGHTWEIGHT BUT HIGHLY RESISTANT
• CORROSION-PROOF AND COMPATIBLE WITH DIFFERENT TYPES OF MORTARS (LIME, CONCRETE, POZZOLAN BASED, ETC.)
• NON-MAGNETIC (NO “FARADAY CAGES”), SUITABLE FOR ECO-SUSTAINABLE WORKS
• REDUCED WEIGHT AND THICKNESS
• EFFICIENT AND DURABLE CONSOLIDATION
• DIFFUSED AND HOMOGENEOUS MECHANICAL IMPROVEMENT
• ENHANCED TRANSPIRATION QUALITY OF VAULTS
• SIMPLE AND RAPID INSTALLATION
• REDUCED HANDLING, INSTALLATION TIME AND COST
FIBRE-REINFORCED SHEETING METHOD
Masonry arches and vaults are often made with materials with poor mechanical strength and irregular shapes. These structures are inadequately connected to the wall frame and in some cases, for instance arches, feature small surfaces, which may hinder efficient consolidation.
The FIBREBUILD-FRP system consists in adding glass fibre or carbon fibre fabrics to the vault intrados or extrados, glued with thermosetting polymer resins. This improves the mechanical strength by reinforcing individual spots or hooping the most sensitive areas of arches and vaults.
Consolidation is made in individual spots, by carefully choosing the amount and arrangement of fibres with a view to maximizing the mechanical properties of the reinforcement, depending on the design needs.
• GREAT MECHANICAL STRENGTH
• CORROSION-PROOF AND COMPATIBLE WITH LIME BASED MORTARS
• ULTRA THIN
• EFFICIENT AND DURABLE CONSOLIDATION
• MECHANICAL IMPROVEMENT WITH TARGETED CONSOLIDATION OF INDIVIDUAL SPOTS
• REINFORCEMENT CAN BE SIZED TO SPECIFIC DESIGN
• REINFORCEMENT CAN BE ADAPTED TO IRREGULAR SHAPES
• NON-INVASIVE CONSOLIDATION