Tesatura unidirectionala din fibre de bazal cu rezistenta ridicata MAPEI MAPEWRAP B UNI-AX

Limba: Engleza

18 afisari

Tip documentatie: Fisa tehnica

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B p a AX r W I e N p U a M Unidirectional, high strength basalt fibre fabric WHERE TO USE This system is suitable for repairing reinforced cement elements damaged by physical-mechanical stresses, combined compressive and bending stress confinement of concrete elements and for seismic upgrading of structures in high-risk areas. Some application examples • Repairs and static upgrading of damaged or deteriorated structures where the shear strength of sections requires integrating. • Confining compressed and pre-compressed elements (pillars, bridge piles, chimneys, etc.) to improve their load-bearing capacity or ductility. • Seismic upgrading and restoration of domed structures without increasing their seismic mass and without the risk of liquids percolating towards their inner surfaces. • Repairs to structures damaged by fire. • Strengthening load-bearing elements in buildings whose structural system has been modified due to new architectural requirements or change in use.

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TECHNICAL CHARACTERISTICS MapeWrap B UNI-AX is a unidirectional basalt fibre fabric characterised by its medium modulus of elasticity and high tensile strength. They may be applied using two different techniques: – “damp” system; – “dry” system; using a complete range of epoxy resins comprising: – MapeWrap Primer 1, suggested for the strengthening of the substrate; –M apeWrap 11 and MapeWrap 12 recommended for the levelling of surfaces with a roughness equal or greater than ± 2 mm. Application is also recommended to improve the adhesion and facilitate the application of high weight fabrics (600 g/m² or higher) (the workability time of MapeWrap 12 is higher than that of MapeWrap 11); –M apeWrap 21 fabric impregnator for “damp” systems; –M apeWrap 31 fabric impregnator for “dry” systems. With the “damp” system, the fabric is pre-impregnated with MapeWrap 21 and then installed, while with the “dry” system, the dry fabric is positioned direc

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tly on a layer of MapeWrap 31 previously applied on the surface of the concrete element to be strengthened. MapeWrap B UNI-AX is 40 cm wide and is produced in two different weights (400 and 600 g/m²) to meet the widest range possible of architectonic requirements. These two fabrics are denominated: – MapeWrap B UNI-AX 400; – MapeWrap B UNI-AX 600. ADVANTAGES Unlike work carried out using conventional techniques, thanks to their extremely low weight, fabrics from the MapeWrap B UNI-AX range may be applied by a smaller team of workers. With the “dry” system or the “damp” system (which only requires tools to make impregnation easier), application is carried out extremely quickly and often without having to interrupt the normal activities of the structure. Compared with the cladding technique with metal plates [Rinforzo strutturale] 1011-mapewrap b uni-ax-gb (6) (22.11.2019 - Corr. PDF Sito) B p a WrNI-AX e p Ma U (beton plaquè), MapeWrap B UNI-AX fabrics may be adapted

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to any form of element requiring repair, they do not require temporary supports during application and any risk of corrosion to the strengthening is completely eliminated. RECOMMENDATIONS All workers must use protective gloves, goggles and anti-solvent safety masks. APPLICATION PROCEDURE Preparation of the substrate The surface on which MapeWrap B UNI-AX fabrics are to be applied must be perfectly clean, dry and strong. If applied on undamaged structures, sandblast the surface to remove all traces of stripping compound, varnish, paint and cement laitance. If the concrete is deteriorated, remove all damaged parts using a hammer, a jackhammer or by hydro-scarifying. Remove all traces of rust from the reinforcement rods and protect them using Mapefer, two-component anti-corrosion cementitious mortar or Mapefer 1K, single component cementitious mortar (please refer to the respective Technical Data Sheet for each product for application procedures). Repair concrete surfaces using products

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from the Mapegrout range. Wait at least three weeks before applying MapeWrap B UNI-AX. If the strengthening operation needs to be carried out immediately, use MapeWrap 11 or MapeWrap 12 to carry out repairs. Seal all cracks in the structure by injecting Epojet or Epojet LV (suitable only for dry or slightly damp cracks) or with Foamjet T or Foamjet F (suitable for damp cracks or if water is seeping in). All sharp corners on elements which are to be strengthened with MapeWrap B UNI-AX (such as beams and pillars) must be rounded off with a jack-hammer or other suitable means. We recommend forming a bending radius of at least 2 cm. “Damp” system application technique for MapeWrap B UNI-AX Application phases 1. Preparation of MapeWrap Primer 1. 2. Application of MapeWrap Primer 1. 3. Preparation of MapeWrap 11 or MapeWrap 12. 4. Application of MapeWrap 11 or MapeWrap 12. 5. Preparation of MapeWrap 21. 6. Impregnation of the fabric with MapeWrap 21. 7. Application of MapeWrap B UNI-

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AX fabric. 1. Preparation of MapeWrap Primer 1 The two components which make up MapeWrap Primer 1 must be mixed together. Pour component B into component A and mix with a low-speed drill with a mixing attachment until the resin is completely blended. Mixing ratio: 3 parts by weight of component A and 1 part by weight of component B. To avoid dosage mistakes, use the entire contents of the two components. If only partial quantities are required, use highprecision electronic scales to weigh out the components (this procedure must also be adopted for the other products). Once prepared, its workability time is approximately 90 minutes at +23°C. 2. Application of MapeWrap Primer 1 Apply an even coat of MapeWrap Primer 1 on the clean, dry concrete surface with a brush or roller. If the surface is highly absorbent, apply a second coat of MapeWrap Primer 1 once the first coat has been completely absorbed. Skim over the surface whilst the product underneath is still “fresh”. Use MapeWrap