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Restoration and protection of reinforced concrete

Restoration and protection of reinforced concrete
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Restoration and protection of reinforced concrete - 1

DESIGN GUIDE ARCHITECTURAL SOLUTIONS RESTORATION AND PROTECTION OF REINFORCED CONCRETE ADHESIVES • SEALANTS • CHEMICAL PRODUCTS FOR BUILDIN

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Restoration and protection of reinforced concrete - 2

specifications of RESTORATION AND PROTECTION OF REINFORCED CONCRETE PRELIMINARY OPERATIONS LAVORAZIONIPRELIMINARI PREPARATION OF SUBSTRATES Idroscarifica STEEL REINFORCEMENT APPLICATION OF ELECTRO-WELDED MESH FORMWORK PROTECTION OF STEEL REINFORCEMENT PROTECTION USING ANTI-CORROSION CEMENTITIOUS MORTAR Concrete structures deteriorated by carbonation and chlorides INTERNAL GALVANIC CATHODIC PROTECTION Concrete structures exposed to chloride-rich environments F.2.2.1 PROTECTION OF NEW STRUCTURES Procedure F.2.2.2 PROTECTION OF STRUCTURES TO BE RESTORED (duration 10 years) Procedure F.2.2.3...

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Restoration and protection of reinforced concrete - 3

F.4.2 TWO-COMPONENT NORMAL-SETTING THIXOTROPIC MORTAR Procedure F.4.3 NORMAL-SETTING CASTABLE MORTAR Procedure F.4.4 CIVIL, RESIDENTIAL, INDUSTRIAL AND INFRASTRUCTURAL WORKS SUBJECTED TO DYNAMIC STRESS NORMAL-SETTING THIXOTROPIC MORTARS Procedure F.4.5 TWO-COMPONENT NORMAL-SETTING THIXOTROPIC MORTARS Procedure F.4.6 RAPID-SETTING CASTABLE MORTAR Procedure F.4.7 NORMAL-SETTING CASTABLE MORTAR Procedure F.5 STRUCTURAL RESTORATION OF CONCRETE DETERIORATED BY AGGRESSIVE AGENTS SUCH AS CARBONATION, CHLORIDES AND SULPHATES WITH LAYERS THICKER THAN AN AVERAGE OF 5 CM F.5.1 CONCRETE MADE WITH...

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Restoration and protection of reinforced concrete - 4

AND TELEPHONE POLES, FENCES, ETC. IN PLACE F.12 PROTECTION OF CONCRETE SURFACES F.12.2 COATING RESISTANT TO THE PENETRATION OF AGGRESSIVE AGENTS F.12.3 COATING RESISTANT TO CHEMICAL PRODUCTS F.12.4 COATING FOR CONTACT WITH DRINKING WATER AND FOOD PRODUCTS

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Restoration and protection of reinforced concrete - 5

PRELIMINARY OPERATIONS F.1.1.1 Hydro-scarifying Hydro-scarification and removal of the cortex of deteriorated cementitious conglomerate, using hydro-scarifying equipment producing jets of water with a maximum pressure of 2,500 atm and a flow-rate of 250 litres of water per minute, to remove all deteriorated concrete and/or prepare the adhesion surface between old and new cast concrete without compromising either the integrity and anchorage of exposed steel reinforcement, or the structural integrity of concrete around the demolished areas. Included and calculated in the price for work...

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Restoration and protection of reinforced concrete - 6

PRELIMINARY OPERATIONS F.1.1.2 Hand or power chiselling and cleaning steel reinforcement by brushing Removal of the cortex of deteriorated cementitious conglomerate, using hand or power chisels, to remove all deteriorated concrete and/or prepare the adhesion surface between old and new cast concrete without compromising either the integrity and anchorage of exposed steel reinforcement, or the structural integrity of concrete around the demolished areas. Exposed steel reinforcement is then cleaned with a hand or power brush to remove oxidation, aggressive chemicals, loose surfaces and any...

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Restoration and protection of reinforced concrete - 7

PRELIMINARY OPERATIONS Cleaning of concrete surfaces and exposed steel reinforcement, where hydro-scarifying has not been carried out, by hydro-sandblasting with silica sand to remove oxidation, aggressive chemicals, loose surfaces and any traces of oil, grease, dirt and all other pollutants to leave a bare metal surface (grade SA 2½) (ISO 8501-1). Hydro-sandblasting is not required if the surface has been prepared by hydro-scarifying. However, if the time between hydro-scarifying and treating the steel reinforcement is particularly long due to on-site logistics, hydro-sandblasting must be...

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Restoration and protection of reinforced concrete - 9

PRELIMINARY OPERATIONS STEEL REINFORCEMENT Replacement of damaged steel reinforcement and positioning new reinforcement Supply and installation of steel reinforcement in reinforced cement structures, after demolishing and breaking-up the cement to enable steel reinforcement to be arranged/replaced, before applying rheoplastic cementitious conglomerate, pre-mixed castable cementitious mortar and concrete. Included and calculated in the price for work carried out according to specification: all costs to cut, straighten or bend new steel reinforcement according to design specifications;...

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Restoration and protection of reinforced concrete - 10

PRELIMINARY OPERATIONSF.1.3 APPLICATION OF ELECTRO-WELDED MESHF.1.3.1 Application of electro-welded mesh Supply and application of electro-welded steel mesh dimensioned according to design specifications (for any diameter of steel wire and any size of mesh) with relative certificate of origin and quality, to reinforce cast concrete, pre-mixed thixotropic, castable cementitious mortar and concrete, suitable also for restoration work and cladding. Included and calculated in the price for work carried out according to specification: -cutting; - all costs for cutting/bending to shape; - wire to...

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Restoration and protection of reinforced concrete - 11

PRELIMINARY OPERATIONS

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Restoration and protection of reinforced concrete - 13

PROTECTION OF STEEL REINFORCEMENT F.2.1 PROTECTION USING ANTI-CORROSION CEMENTITIOUS MORTAR Concrete structures deteriorated by carbonation and chlorides F.2.1.1 Application of one-component, anti-corrosion, re-alkalising cementitious mortar Supply and application of a passivating treatment for steel reinforcement, by brush-applying two coats of one-component, anti-corrosion cementitious mortar made from cementitious binders, powdered polymers and corrosion inhibitors (such as Mapefer 1K produced by MAPEI S.p.A.). Apply the mortar after adequate preparation of the substrate (not included),...

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Restoration and protection of reinforced concrete - 14

PROTECTION OF STEEL REINFORCEMENT Application of two-component, anti-corrosion, re-alkalising cementitious mortar Supply and application of a passivating treatment for steel reinforcement by brush-applying two coats of two-compone anti-corrosion cementitious mortar made from cementitious binders, powdered polymers and corrosion inhibitors (such Mapefer produced by MAPEI S.p.A.). Apply the mortar after adequate preparation of the substrate (not included), by remov all deteriorated concrete to obtain a solid, sufficiently-rough substrate with no loose portions and removing all rust from s...

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Restoration and protection of reinforced concrete - 15

F.2 PROTECTION OF STEEL REINFORCEMENT Procedure Protection of steel reinforcement Protection of steel reinforcement using Mapeshield 110/20 (see section F.2.2.1.1) or Mapeshield I 30/20 (see section F.2.2.1.2) pure zinc internal sacrificial anodes. The number of anodes connected to the steel reinforcement depends on the amount of steel contained in the first 20 cm of concrete, starting from the surface exposed to aggressive agents. For a steel/concrete surface area ratio of 1, use 2 Mapeshield 110/20 anodes per square metre or 1.5 Mapeshield I 30/20 anodes per square metre. Weld the...

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