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Through its wide range of construction and engineering services, VSL provides engineers, contractors, consultants and owners with the specialist advice they need.
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Rehabilitation, Strengthening and Protection of Concrete structures require thorough investigations, clearly defined procedures, expert execution and systematic quality control.
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VSL offers a wide range of specialist skills in each of the main areas of structural investigation, repair, strengthening and protection.
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Our experienced specialists inspect and assess civil engineering works, buildings, bridges, and industrial structures both to determine present condition and initiate measures found necessary for restoration to full service condition. In many cases, our team of experts will also undertake the project management for rehabilitation work, in agreement with the contractor and/or owner.
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Structural remedial work demands thorough diagnosis of damage/ deterioration and full assessment of causes, risk and consequences involved.VSL emplys state-of-the-art equipment and special inspection techniques to detect any defects in concrete, reinforced concrete, and prestressed concrete structures before any significant damage occur. Close operation with material testing institutes, structural designers and the latest investigation techniques enables VSL to prepare precise and comprehensive reports such as: • Inspection and surveyance of concrete structures • Condition evaluation of concrete structures • Root cause analysis • Design of repair strategies • Order-of-Cost magnitudes To repair or not to repair..... 
Once the outward sign of structural problem have been observed, the next step is critical: to indentify the undelying cause.Any decision to repair strategy - should never be based solely on effect. It should always arise from any analysis of the cause. A solid understanding of the root cause will help determine whether the observerable effect actually warrants a repair. Many owner-related issues must also be assessed - safety environmental effects, change of structural usage, new design loads, and risk level, to name just several before wise decision can be made to repair or not to repair. |
VSL provides repair, strengthening and protection for concrete structures in bridges, office buildings, residences, factories and warehouses.VSL has the expertise and technical competence needed to solve problems requiring surface repairs strengthening, stabilization, waterproofing and protection. Our toolbox offers solutions applicable to repair of all structures including airports, bridges, buildings, high-rise structures, parking structures, plaza decks, tunnels and historic structures. By applying new technologies to well-established repair principles, VSL partners with owners and designers to safely deliver cost effective solutions. Continual commitment to quality and long-term solutions has earned VSL recognition as a leading repair and strengthening specialist contractor. We established stringent technical guidelines and quality standards to field procedures. These standards, along with our outstanding safety program and focused repair and strengthening experience, are key elements of the quality thath VSL brings to every project. 
Non-Destructive Testing:• Prestressed Tendon Detection • Re-bar Orientation Detection • Concrete Defects Detection • Prestressed Tendon Grout Void Detection Structural Repairs: • Concrete • Reinforced Concrete • Prestressed Concrete • Reinforcement Repair • Historic Restoration • Re-Anchoring of Prestressing Tendons Rehabilitation & Protection • Chemical/Epoxy Injection • Rout/Seal Cracks • Expansion Joints Replacement • Structural Bearing Replacement • Cathodic Protection |
 External Post-Tensioning of Beams |
 Rehabilitation Works Under Mid Span of bridge |
 Full Span Vertical Lifting of Bridge |
 External Post Tensioning of Piers |
 Full Replacement of Bridge Beams |
 Replacement of Bridge Bearings |
As a leading provider of specialty structural repair, strengthening and protection solutions for industrial facilities, VSL understands the unique challenges faced by industrial owners and operators.Since repair works typically takes place in functioning facilities, VSL recognizes the need to ensure continuous plant operations. Executing repairs under these conditions requires an experienced industrial contractor that employ a team approach. With VSL every project is carefully preplanned in close coordination with plant operations, maintenance and safety personnel. Our work is carried out safely and with the least impact on critical manufacturing, processing, or production activities. Skilled teams develop safety-oriented solutions for challenging environments to provide turnkey project delivery. In industrial facilities throughout the world, VSL can be relied on creativity, quality and dependability to deliver the project on time with budget and with minimal disruption to operations. 
Design-Build Repair Service:• Inspection Service • Condition Evaluation • Repair Design • Project Planning • Project Management Repair & Maintenance Service: • Concrete & Structural Repairs • Protective Coatings & Linings • Concrete Fireproofing Repairs • Structural Support & Shoring • Heavy Lifting • Turnaround and Shutdown Contracts • Maintenance Contracts • Strengthening & Upgrades |
The need for strengthening may arise from deterioration, change in use, change in desin code, structural defects and seismic conditions.VSL utilizes the latest technologies to develop innovative strategies to restore or add load-carrying capacity bridges, parking facilities, silos, and other structures. Solutions for strengthening include fiber-reinforced polymer (FRP), Prestressed FRP, Hardwire® Steel Reinforced Polymer (SRP), post-tensioning, supplemental steel framing, and section enlargement. |
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Strengthening Systems & Services: • Preliminary Evaluation • Composite Systems • Vwrap® CFRP Fabrics • Vplate® CFRP Plates • Vrod® CFRP Rods • Hardwire SRP • Prestressed CFRP • External & internal Post-Tensioning Systems • Section Enlargement • Span Shortening • Vibration Dampening • Load Isolation |
 Prestress FRP Fabric |
 Carbon Fibre Plates |
 CarboStress Prestress CFRP |
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Strengthening with post-tensioned CFRP Since the development of CFRP (Carbon Fibre Reinforced Polymers) in the late sixties these materials have been used increasingly for structural strengthening, during the last ten years they have also been used as post-tensioned (PT) strengthening tendons for applications on bridges and other structures. |
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Reasons for the strengthening of Bridges: • Increased live loads / traffic • Change of design requirements • Deterioration due to corrosion, fire, earthquake • Change of statical system • Excessive deformation and cracks • Stressing Anchorage |
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1. Shear 2. Widening of superstructure 3. Wind / noise barrier walls 4. Longitudinal and transverse 5. Pile caps and pier heads |
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Reasons for the strengthening of other Structures: • Increased life loads incl. earthquake resistance • Change of use (conversion) • Change of design requirements • Deterioration due to corrosion, fire, earthquake, etc. • Excessive deformation and cracks • Change of structural system (such as removal of load bearing walls or columns) |
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2. Earthquake protection 3. Additional openings in walls and slabs |
INTRAFOR - the ground engineering and foundations specialist subsidiary of VSL is also to provide a full package of design and construct solution to any foundation enhancement improvement and remedial programs.Going from simple waterproofing grouting of earth retaining structures to full scale foundation rehabilitation such as load transfer and replacement piles. VSL and INTRAFOR are ready to tackle the technical challenges raised by the difficult task of underground structure diagnosis, repair and strengthening. |
Sub-Structure Service:Testing & Investigation • Sonic Logging • Coring • Sampling • Video Inspection • Material Analysis • PDA/PIT/Capwap • Radar • Impact Echo Testing Design & Build Repair Service • Repair Design • Project Management • Construction Rehabilitation & Remedial • Remedial Piles • Compensation & Structural Grouting • Specific Waterproofing Grouting |
VSL also offers materials for blast and impact resistance. Ductal® is a patented materials consisting of cement, sand, silica fume, silica flour, admixture and water, with very fine high strength steel fibres. The use of Ductal® enables the development of new and innovative products for the protection of critical infrastructures and high-risk facilities. Ductal® may applied for both new construction and retrofitting purposes.
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Blast & Impact Resistance Systems Using Ductal® or Hardwire® SRP:• Blast Walls • Façade panels • Explosives and hazardous materials storage • Blast resistance walls in chemicals, oil/gas and offshore facilities • Blast and fire resistance coverings for parts of critical structures • Defence applications • Bullet proof and projectile resistant barriers • Other applications that are subject to high impact loads can also be developed based on the results of the research. |
The DeMon is a combination of services provided by VSL that bring the data of the monitoring (instrumentation and inspection) on the desk of the owner and the designer on the simplest way.It is made of back end and a front end: The back end Demon Site is a software installed on site that collects and filters the data from any type of sensors. The front end Demon Server is a secured Web server to which data are then processed, that allows authorised people to access to the data of their project on real time from everywhere. Added services such as real time alarm and back analysis can also be included. Reports can be contained in the DeMon service for diffusion of electronic or printed documentation from Designer and Expert. |
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