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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

Product catalog summary

Restoration and Protection of Reinforced Concrete

1. Preliminary Operations

Preparation of Substrates: Techniques such as hydro-scarifying, chiselling, and hydro-sandblasting are used to prepare surfaces for restoration.
Steel Reinforcement: Damaged steel is replaced, and electro-welded mesh is applied for reinforcement.
Formwork: Proper positioning and support of formwork are essential for structural strengthening.

2. Protection of Steel Reinforcement

Anti-Corrosion Cementitious Mortar: One-component or two-component mortars protect steel from carbonation and chlorides.
Galvanic Cathodic Protection: Methods for structures in chloride-rich environments, applicable to both new and existing structures.

3. Restoration of Concrete

Thixotropic Mortars: Rapid-setting and normal-setting mortars are used for concrete affected by carbonation, chlorides, and sulphates.
Structural Restoration: Techniques for various works, including those under dynamic stress scenarios.

4. Additional Procedures

Shrinkage Reducer: Curing admixtures reduce hydraulic shrinkage and micro-cracks.
Repairs to Cracked Concrete: Injection or casting methods for dry or slightly damp cracks.
Structural Bonding: Techniques for bonding hardened and fresh concrete, and steel plates to concrete.
Surface Skimming: Techniques for uneven surfaces with or without dynamic stress.
Anchoring and Fastening: Methods for anchoring steel reinforcement and rapid fastening of components.
Protection of Concrete Surfaces: Hydrophobic impregnation and coatings resistant to aggressive agents, chemicals, and suitable for contact with drinking water and food products.

Concrete Restoration Procedures

Preparation of Substrates: Deteriorated concrete is removed to achieve a solid substrate. Steel reinforcement is cleaned to bare metal.
Protection of Steel Reinforcement: Steel is treated with anti-corrosion cementitious mortar after rust removal.
Restoration Operations: Surfaces are cleaned and saturated before mortar application. Mortars like Mapegrout 430 or T40 are used, mixed with Mapecure SRA to reduce shrinkage.
Application of Thixotropic Mortars: Mortars must meet EN 1504-3 standards, with specific performance characteristics.
Performance Characteristics: Mortars must comply with EN 1504-3 standards, with requirements for compressive strength, flexural strength, adhesion, and thermal compatibility.
Application Techniques: Mortars are applied by trowel or spray, with proper curing techniques to ensure longevity.

Specifications:

Modulus of Elasticity: 22 GPa after 28 days.
Adhesion to Substrate: > 2 MPa after 28 days.
Capillary Absorption: < 0.25 kg/m²·h^0.5.
Impermeability to Water: Penetration depth < 10 mm.
Thermal Compatibility: > 2 MPa after freeze-thaw cycles.
Reaction to Fire: Euroclass E.
Consumption: Approximately 21 kg/m² per cm of thickness.

Procedures:

Hydro-cleaning and saturation of substrate before mortar application.
Application by trowel or spray around steel reinforcement.
Levelling and tamping of surfaces.
Curing by spraying water for at least 24 hours post-application.

Restoration of Concrete:

Use of two-component, normal-setting, shrinkage-compensating, class R3 thixotropic mortar with low modulus of elasticity.
Application in layers from 0.5 to 2 cm thick.
Compliance with EN 1504-3 for structural R3-class mortars.
Performance characteristics include compressive strength ≥ 38 MPa, flexural strength ≥ 7 MPa, and adhesion to substrate ≥ 2 MPa.

Structural Restoration:

Preparation involves removing deteriorated concrete and cleaning steel reinforcement.
Use of one-component, normal-setting, shrinkage-compensating, class R4 thixotropic mortar for layers from 1 to 3.5 cm thick.
Compliance with EN 1504-3 for structural R4-class mortars.
Performance characteristics include compressive strength > 60 MPa, flexural strength > 8.5 MPa, and adhesion to substrate > 2 MPa.

Recommendations:

Use of Mapecure SRA additive to reduce shrinkage.
Application in multiple coats if thickness exceeds specified values.
Use of electro-welded mesh for reinforcement.
Damp-curing technique recommended in hot or windy conditions.

Steel Reinforcement Preparation and Protection

Hydro-sandblasting is necessary for long steel reinforcement. Damaged or corroded steel must be replaced. After rust removal, apply two coats of Mapefer anti-corrosion mortar.

Concrete Restoration Procedures

Surfaces must be cleaned and saturated before restoration. Use Mapegrout BM for layers 1-3.5 cm thick, mixed with Mapecure SRA to reduce shrinkage. Apply with a trowel or spray, reinforcing with electro-welded mesh if necessary. Ensure proper curing to prevent rapid evaporation.

Specifications for Mapegrout BM

Complies with EN 1504-3 for R4-class mortars. Key characteristics include compressive strength >47 MPa, flexural strength >10 MPa, and adhesion >2 MPa. Consumption is approximately 21 kg/m² per cm thickness.

Normal-Setting Castable Mortar Application

Prepare substrates by removing deteriorated concrete and cleaning steel reinforcement. Use Mapegrout Hi-Flow for layers 1-4 cm thick, adding Mapecure SRA to reduce shrinkage. Cast the mortar ensuring air expulsion and proper curing.

Specifications for Mapegrout Hi-Flow

Complies with EN 1504-3 for R4-class mortars. Key characteristics include compressive strength >75 MPa, flexural strength 12 MPa, and adhesion >2 MPa. Consumption is approximately 21 kg/m² per cm thickness.

Thixotropic Mortars for Dynamic Stress

Prepare substrates similarly, using products like Mapegrout T60 or Mapegrout Easy Flow for layers 1-5 cm thick. These mortars are designed for high resistance and ductility, suitable for dynamic stress environments.

Structural Restoration of Concrete

Specifications:

The document outlines the use of one-component, normal-setting, shrinkage-compensating, class R4 thixotropic mortars for structural restoration of concrete deteriorated by aggressive agents such as carbonation, chlorides, and sulphates. These mortars are suitable for civil, residential, industrial, and infrastructural works without dynamic stress.

Procedures:

Preparation of Mortar: Add Mapecure SRA, a shrinkage-reducing agent, at 0.25% weight of the mortar. Apply within the specified temperature range.
Application: Mortar can be applied by trowel or spray. For thicknesses exceeding specified values, apply in multiple coats with electro-welded mesh reinforcement.
Substrate Preparation: Remove deteriorated concrete to form a rough, solid substrate. Clean steel reinforcement to bare metal and apply a passivating treatment.

Performance Characteristics:

The mortars must comply with EN 1504-3 for R4-class structural mortars, with specific performance metrics such as compressive strength (>60 MPa), flexural strength (>8 MPa), and adhesion to substrate (>2 MPa). They should also demonstrate resistance to cracking, carbonation, and water permeability.

Reinforcement and Protection:

Steel reinforcement should be cleaned and treated with anti-corrosion cementitious mortar. If necessary, replace damaged reinforcement.

Recommendations:

Ensure careful curing by spraying water for at least 24 hours post-application. Use appropriate application methods (trowel or spray) based on project requirements.

Additional Notes:

Incorporate special additives to enhance mortar properties, such as high ductility and resistance to sulphates. The document also specifies the characteristics of fibres used in the mortar, including tensile strength and modulus of elasticity.

Structural Restoration of Concrete

Specifications and Procedures:

The document outlines procedures for restoring concrete structures deteriorated by aggressive agents such as carbonation, chlorides, and sulphates. It emphasizes the importance of cleaning surfaces and saturating substrates with water before applying restoration materials.

Restoration Materials:

Mapegrout BM: A two-component, normal-setting, shrinkage-compensating, class R4 thixotropic mortar with a low modulus of elasticity for layers from 1 to 3.5 cm thick. It is suitable for structures subjected to small deformations under load.
Mapegrout SV Fiber: A one-component, normal-setting, shrinkage-compensating, high-ductility, class R4 castable mortar strengthened with metal fibres for layers from 1 to 5 cm thick.
Mapegrout Hi-Flow GF and TI 20: One-component, normal-setting, shrinkage-compensating, high-ductility, class R4 castable mortars for layers from 1 to 5 cm thick.

Application Techniques:

Mortars should be applied by trowel or spray, ensuring the substrate is clean and saturated with water.
For thicker applications, mortars should be applied in multiple coats with electro-welded mesh reinforcement to compensate for shrinkage.
Special care should be taken to prevent rapid evaporation of water during curing, especially in hot or windy conditions.

Standards and Compliance:

All products must comply with EN 1504-3 for structural R4-class mortars. Key characteristics include compressive strength, flexural strength, adhesion to substrate, and impermeability to water.

Recommendations:

Use anti-corrosion treatments for steel reinforcement to prevent rust formation.
Ensure proper curing by spraying water or using anti-evaporation products.
Follow technical data sheets for mixing ratios and application conditions.

Introduction

This document outlines the application of one-component, normal-setting, shrinkage-compensating, high-ductility, class R4 castable mortar, strengthened with inorganic and metal fibres, for reconstructing deteriorated concrete structures. It includes specifications, procedures, and performance requirements.

Specifications

The mortar is composed of high-strength cement, selected aggregates, synthetic polyacrylonitrile fibres, inorganic fibres, and special additives. Inorganic fibres have lengths of 6 and 12 mm, a diameter of 14 µm, tensile strength of 1700 MPa, and a modulus of elasticity of 72 GPa. Metal fibres are brass-plated, hooked steel with a length of 30 mm, diameter of 0.6 mm, tensile strength > 1200 MPa, and modulus of elasticity of 210 GPa.

Application Procedure

Prepare the substrate by removing deteriorated concrete and cleaning steel reinforcement.
Apply a passivating treatment to the steel reinforcement.
Cast the mortar in layers from 1 to 5 cm thick on a saturated substrate.
Add a curing additive to reduce shrinkage.

Performance Requirements

The mortar must comply with EN 1504-3 for R4-class structural mortars, with compressive strength > 65 MPa, flexural strength of 10 MPa, and adhesion to substrate > 2 MPa after 28 days. It should resist cracking, carbonation, and water penetration, with a reaction to fire classified as Euroclass A1.

Structural Restoration

For layers thicker than 5 cm, use expanding cementitious binders like Stabilcem or Stabilcem SCC for pumped or self-compacting concrete. The concrete mix should have a low water/binder ratio and include a shrinkage-reducing agent.

Mix Design

Typical mix designs are provided for both pumped and self-compacting concrete, specifying quantities of binder, aggregates, water, and additives.

Conclusion

This document provides comprehensive guidelines for the application of high-ductility, shrinkage-compensating mortars and concrete for structural restoration, ensuring compliance with relevant standards and performance criteria.

Shrinkage Reducer for Mortar and Concrete

The document outlines the use of a chloride-free, liquid curing admixture, such as Mapecure SRA by MAPEI S.p.A., to reduce micro-cracking and hydraulic shrinkage in mortar and concrete. The admixture is compatible with various super-plasticising admixtures and cement types as per UNI EN 197-1 standards. Key characteristics include a liquid consistency, transparent color, and a density of 0.91 g/cm³. Consumption rates are specified for both mortar and concrete applications.

Repairs to Cracked Concrete

The document details procedures for repairing cracked concrete using various epoxy resins and cementitious binders. It includes:

Two-component, super-fluid epoxy resin for monolithic repairs and structural consolidation, meeting EN 1504-5 standards.
Two-component epoxy resin with very low viscosity for micro-cracked concrete, also meeting EN 1504-5 standards.
Two-component fluid adhesive for medium-viscosity applications, complying with EN 1504-4 standards.
Expanding cementitious binder for injection slurry, used for high-quality, no-shrink slurry applications.

Each product's performance characteristics, such as workability time, tensile strength, and compressive strength, are specified.

Structural Bonding of Concrete

The document describes the application of various two-component, thixotropic epoxy adhesives for bonding hardened concrete elements. These adhesives, such as Adesilex PG1 and PG2 by MAPEI S.p.A., are used for structural bonding and meet EN 1504-4 standards. Key performance characteristics include density, workability time, linear shrinkage, and compressive strength. The adhesives are applied after substrate preparation and are spread with a trowel to ensure penetration into uneven areas.

Specifications:

The document outlines the application of various types of cementitious mortars for skimming and finishing concrete surfaces. These mortars are designed to provide abrasion resistance, sulphate resistance, and water repellency. They are composed of high-strength cement, selected aggregates, special additives, and synthetic polymers.

Procedures:

Surface Preparation: Remove all crumbling or detached areas to ensure a solid substrate. Clean the surface to remove dust or other elements that could prevent adhesion.
Application: Apply the mortar with a smooth metal trowel or by spray on a clean, damp substrate. The thickness of the application varies from 1 to 6 mm depending on the product and substrate conditions.
Finishing: Finish the surface with a smooth metal trowel or sponge float.

Performance Characteristics:

Compressive Strength: Ranges from >16 MPa to >50 MPa after 28 days.
Flexural Strength: Ranges from >4 MPa to >10 MPa after 28 days.
Adhesion to Substrate: ≥1 MPa to ≥2 MPa after 28 days.
Impermeability: Low permeability to water (Class III) with W < 0.05 kg/m²·h^0.5.
Permeability to Water Vapour: Class I, S_D < 0.5 m.
Reaction to Fire: Euroclass E.

Standards and Compliance:

The products comply with EN 1504-2 coating standards for concrete protection and are classified according to EN 998-1 standards as GP-type skimming mortar, category CS IV.

Recommendations:

Use alkaline-resistant glass fibre mesh between layers for thicker applications and when skimming surfaces made of different materials. Ensure proper substrate preparation to maximize adhesion and performance.

Specifications:

The document outlines the application of various types of skimming mortars for concrete and render surfaces. It specifies the preparation of substrates, application methods, and performance characteristics required for different types of mortars.

Procedures:

Substrate Preparation: Remove all crumbly or detached areas and dust to ensure a solid substrate.
Application: Apply the mortar with a smooth, metal trowel in layers up to 3 mm thick. For thicker layers, apply in two steps with glass fibre mesh reinforcement.
Finishing: Finish the surface with a trowel or sponge float.

Standards and Performance:

The mortars must comply with EN 1504-2 and EN 998-1 standards, with specific performance characteristics such as compressive strength, adhesion, impermeability, and thermal compatibility.

Recommendations:

Use alkaline-resistant glass fibre mesh for reinforcement in thicker applications.
Ensure substrates are clean and damp (for absorbent surfaces) or dry (for old paintwork) before application.
Follow specific performance requirements for each type of mortar, including compressive strength and adhesion.

Key Data from Tables:

Compressive strength ranges from >6 MPa to >16 MPa after 28 days, depending on the mortar type.
Adhesion to substrate is generally ≥ 1 MPa after 28 days.
Water permeability is classified as low (Class III) with W < 0.1 kg/m²·h^0.5.
Reaction to fire varies from Euroclass A1 to E.

Critical Information:

Ensure proper substrate preparation to prevent adhesion issues.
Use appropriate mesh reinforcement for surfaces with different material types.
Follow specified application thickness and performance standards to ensure durability and effectiveness.

Specifications:

The document outlines the application of various construction materials, primarily focusing on cementitious and epoxy mortars, and hydraulic binders. These materials are used for waterproofing, protecting concrete substrates, anchoring steel reinforcements, and rapid fastening of construction elements.

Procedures:

Application of Cementitious Mortar: The mortar is applied in two layers with an alkaline-resistant glass fibre mesh between them. The product must meet EN 1504-2 standards and exhibit specific adhesion, flexibility, and impermeability characteristics.
Application of Expanding Mortars: These mortars are used for anchoring steel reinforcements and machinery. They must comply with EN 1504-6 standards and demonstrate high compressive and flexural strength.
Application of Epoxy Mortars and Resins: Used for precision anchoring, these products must meet EN 1504-6 standards and show excellent adhesion and mechanical properties.
Rapid Fastening and Filling: Utilizes rapid-setting hydraulic binders for fastening construction elements. The binders must set quickly and provide high compressive strength.

Performance Characteristics:

Adhesion to concrete, flexibility, crack-bridging, and impermeability are critical performance metrics for the cementitious mortar.
Expanding mortars must exhibit high compressive strength, low water permeability, and excellent adhesion.
Epoxy mortars and resins should have high tensile and compressive strength, low creep, and good thermal properties.
Rapid-setting binders must set quickly and provide sufficient strength for immediate use.

Recommendations:

Ensure proper substrate preparation by removing deteriorated concrete and cleaning surfaces thoroughly.
Apply products in specified thicknesses and ensure proper curing to achieve desired performance.
Overlap reinforcement materials adequately to ensure structural integrity.

Norms and Standards:

The document references several European standards (EN) for testing and performance, including EN 1504-2, EN 1504-6, EN 1542, and others, ensuring the materials meet industry requirements for safety and effectiveness.

Specifications and Performance Characteristics

The document outlines the specifications for various construction products, primarily focusing on mortars and coatings used for concrete structures. The products must comply with EN 1504-3 for R4-class structural mortars and EN 1504-2 for coatings.

Mortar Application and Characteristics

Rapid-Setting Mortar: Used for reconstructing deteriorated concrete and fastening urban features. It sets for pedestrian and vehicular traffic in approximately 2 hours at 20°C. The mortar's compressive strength varies with temperature, reaching >45 MPa after 28 days.
Thixotropic Mortar: Applied in layers of 1 to 5 cm on a prepared substrate. It also sets for traffic in about 2 hours at 20°C.

Protection of Concrete Surfaces

Hydrophobic Impregnation: Utilizes a silane and siloxane impregnator to make surfaces water-repellent. It has a penetration depth of 4 mm and complies with various absorption and resistance standards.
Elastic Cementitious Coatings: Applied by trowel or spray, these coatings protect against chlorides and carbonation. They require a solid substrate and may include glass fibre mesh for reinforcement.
Elastic Acrylic Coatings: These coatings, such as Elastocolor Paint, provide crack-bridging and protective properties. They are applied in two coats and have high resistance to aging and atmospheric agents.

Application Procedures

Surface Preparation: All substrates must be adequately prepared by removing deteriorated areas and ensuring a clean, damp surface for optimal adhesion.
Application Techniques: Products can be applied using trowels, brushes, rollers, or spray machines, depending on the product type and desired finish.

Performance Metrics

Adhesion and Elasticity: Products are tested for adhesion to concrete, elasticity, and crack-bridging capabilities under various conditions.
Permeability and Resistance: Coatings are evaluated for water and CO2 permeability, resistance to carbonation, and thermal compatibility.

Compliance and Standards

All products must meet specific European standards for performance, including EN 1542 for adhesion, EN 1062 for permeability, and EN 13501 for fire reaction.

Protection of Concrete Surfaces

1. Acrylic Coatings

1.1 Semi-transparent Acrylic Paint

Application: Two coats using brush, roller, or spray after primer.
Characteristics: Thick liquid, dry solids content approx. 59%, density approx. 1.27 g/cm³.
Performance: High CO2 permeability, water vapor permeability class I, compliant with thermal compatibility and crack resistance standards.

1.2 Protective Acrylic Paint

Application: Two coats with brush, roller, or spray after primer.
Characteristics: Thick liquid, dry solids content approx. 61%, density approx. 1.35 g/cm³.
Performance: High CO2 permeability, water vapor permeability class I, compliant with thermal compatibility and crack resistance standards.

2. Coating Resistant to Chemical Products

2.1 Slightly Aggressive Liquids

Application: Two-component epoxy paint, two coats on prepared substrate.
Characteristics: Transparent white or grey, density 1.3 g/cm³, viscosity 2600 MPa·s.
Performance: Compliant with EN 1504-2, resistant to thermal shock and chemical attack.

2.2 Aggressive Liquids

Application: Two-component epoxy resin paint, two coats on prepared substrate.
Characteristics: 100% dry solids content, final hardening in 7 days.
Performance: High CO2 permeability, resistant to thermal shock and severe chemical attack.

2.3 Highly Aggressive Liquids

Application: Two-component epoxy paint with high covering pigments, two coats on prepared substrate.
Characteristics: Mixing ratio 4:1, density 1,300 kg/m³, viscosity 1,500 mPa·s.
Performance: High CO2 permeability, resistant to thermal shock and chemical attack.

3. Coating for Contact with Drinking Water and Food Products

Application: Two-component epoxy paint, two coats on prepared substrate.
Characteristics: Complies with EU regulations for potable water and food contact.
Performance: High CO2 permeability, resistant to thermal shock and chemical attack.

Catalog excerpts

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 PROTECTION...

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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 SPECIAL...

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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 carried...

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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 traces...

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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 carried...

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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; positioning,...

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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 tie...

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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), by...

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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 reinforcement...

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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 connectors...

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