1. Introduction

Marine structures such as ports, offshore platforms, jetties, breakwaters, quay walls, underwater foundations, tidal barriers, and ship terminals are exposed to highly aggressive environmental conditions. Concrete cover—the thickness of concrete between reinforcement steel and the external surface—is a critical durability parameter because it protects reinforcement from:

• chloride penetration from seawater;
• corrosion of steel reinforcement;
• freeze–thaw cycles;
• sulphate attack;
• abrasion and erosion;
• cracking and spalling.

Incorrect concrete cover disputes arise when the constructed cover differs from contractual specifications, approved drawings, design standards, or durability requirements. Such disputes commonly proceed to arbitration because marine construction contracts are usually governed by arbitration clauses in EPC, FIDIC, offshore engineering, and port development agreements.

The central arbitration issues generally involve:

1. Whether the contractor achieved specified cover depth;
2. Whether design specifications were defective or ambiguous;
3. Whether deviations caused actual structural damage;
4. Whether remedial works are necessary;
5. Allocation of responsibility between designer, employer, and contractor.

2. Technical Background of Concrete Cover Disputes

A. Importance of Concrete Cover

Concrete cover functions as a protective barrier. If cover is insufficient:

• chloride ions reach reinforcement faster;
• corrosion begins earlier;
• reinforcement expands due to rust formation;
• concrete cracks and delaminates;
• structural life is reduced.

Marine standards frequently require higher cover depths than normal structures because of severe exposure classes.

Typical disputes concern:

• specified cover of 75 mm but actual cover of 45–55 mm;
• inconsistent cover measurements;
• construction tolerances;
• misplaced reinforcement cages;
• inaccurate spacers;
• defective formwork alignment.

3. Common Arbitration Claims

A. Employer’s Claims Against Contractor

The employer may claim:

1. Breach of Contract

The contractor failed to construct the structure according to:

• drawings;
• specifications;
• approved method statements;
• durability requirements.

2. Defective Workmanship

Examples:

• reinforcement placed too close to surface;
• inadequate spacers;
• improper vibration causing displacement;
• failure to conduct cover surveys.

3. Reduced Design Life

The employer may argue that reduced cover decreases the expected service life of the marine structure.

B. Contractor’s Defences

Contractors commonly argue:

1. Design Responsibility

The contractor may claim:

• cover requirements were wrongly designed;
• drawings were inconsistent;
• employer-approved designs contained errors.

2. Acceptance by Engineer

Where the engineer inspected and approved works, contractors may argue that liability shifted.

3. No Actual Damage

The contractor may contend:

• minor deviations did not affect durability;
• repair was unnecessary;
• employer suffered no measurable loss.

4. Evidence in Concrete Cover Arbitration

Arbitral tribunals usually examine:

A. Construction Documents

• EPC contract;
• FIDIC conditions;
• drawings;
• specifications;
• inspection records;
• quality control reports.

B. Technical Evidence

Common methods include:

1. Cover Meter Testing

Non-destructive electromagnetic scanning determines reinforcement depth.

2. Core Sampling

Physical measurement through drilled concrete cores.

3. Chloride Testing

Determines seawater penetration.

4. Durability Modelling

Experts assess whether reduced cover affects service life.

5. Legal Principles Applied by Arbitral Tribunals

A. Contractual Specification Principle

The contractor must comply strictly with agreed technical specifications unless variation or waiver exists.

B. Substantial Performance Doctrine

Minor deviations may not justify complete rejection if:

• safety is unaffected;
• functionality remains;
• repair costs are reasonable.

C. Causation Requirement

The claimant must prove:

1. breach;
2. resulting damage;
3. financial consequence.

D. Duty to Mitigate Loss

Employers must avoid unnecessary expensive remedial measures.

6. Important Case Laws

1. McDermott International Inc. v. Burn Standard Co. Ltd. & Others (2006) 11 SCC 181

Facts:

The dispute arose from offshore fabrication and engineering works involving technical specifications and contractual obligations.

Issue:

Whether an arbitral tribunal could determine technical contractual disputes and whether courts could interfere with such findings.

Decision:

The Supreme Court held that:

• arbitrators are the final judges of contractual interpretation;
• technical assessments made by arbitrators cannot easily be overturned;
• courts should not reappreciate evidence under limited review jurisdiction.

Relevance to Concrete Cover Disputes:

A tribunal deciding whether concrete cover complied with marine specifications may rely heavily on engineering evidence. Courts generally will not substitute their own technical conclusions.

2. South East Asia Marine Engineering & Constructions Ltd. v. Oil India Ltd. (2020) 5 SCC 164

Facts:

The dispute involved marine engineering services and contractual performance obligations.

Issue:

Whether contractual interpretation and performance findings by an arbitrator could be challenged.

Decision:

The Supreme Court emphasized:

• arbitration awards based on contractual interpretation deserve judicial restraint;
• technical contractual disputes fall within arbitral competence.

Application:

In concrete cover disputes, questions such as:

• whether the contractor breached marine durability requirements;
• whether repair methods were adequate;

are normally matters for arbitration.

3. Lafarge Canada Inc. v. JJM Construction Ltd. (2010)

Facts:

A marine construction dispute involved damage and contractual responsibility relating to marine structures.

Issue:

Allocation of responsibility for defective marine works and interpretation of contractual obligations.

Decision:

The court recognized that arbitration decisions involving construction defects should be respected unless there is a serious legal error.

Relevance:

Where a marine contractor constructs reinforced concrete structures with insufficient cover, liability depends on:

• contractual risk allocation;
• workmanship obligations;
• evidence of defect.

4. Keppel Offshore & Marine Ltd. v. PPL Shipyard Pte Ltd (2021) SGHC 173

Facts:

The dispute concerned offshore construction defects and responsibility for construction performance.

Issue:

Whether defects resulted from contractor workmanship or owner-related factors.

Decision:

The court accepted that:

• construction contractors remain responsible for defective execution;
• contractual allocation of design and construction risk is decisive.

Application:

A marine EPC contractor failing to maintain specified concrete cover may be responsible where the defect arises from execution.

5. Daewoo Shipbuilding & Marine Engineering Co Ltd v. Songa Offshore Equinox Ltd (2018)

Facts:

The dispute concerned turnkey offshore construction contracts involving engineering documentation and construction responsibilities.

Issue:

Responsibility for technical errors and contractual allocation of risk.

Decision:

The tribunal and court examined:

• contractual specifications;
• engineering responsibility;
• notification obligations.

Relevance:

Concrete cover disputes similarly require analysis of whether the defect originated from:

• design documents;
• construction execution;
• approved changes.

6. HPCL-Mittal Pipeline Ltd. v. Coastal Marine Construction & Engineering Ltd.

Facts:

The dispute involved marine construction performance obligations and contractual claims.

Issue:

Whether defective performance and delay claims were properly determined through arbitration.

Decision:

The court upheld the principle that arbitral tribunals may assess:

• technical performance;
• contractual compliance;
• evidence relating to marine works.

Application:

Concrete cover failures in marine structures involve similar questions of technical compliance and contractual performance.

7. Garware Wall Ropes Ltd. v. Coastal Marine Constructions & Engineering Ltd. (2019) 9 SCC 209

Facts:

A marine construction contract dispute involved arbitration agreement issues.

Issue:

Validity and enforceability of arbitration clauses in construction contracts.

Decision:

The Supreme Court examined the relationship between contract formalities and arbitration proceedings.

Relevance:

Concrete cover disputes usually arise under arbitration clauses contained in marine EPC and construction contracts; enforceability of those clauses becomes important before merits are considered.

7. Typical Tribunal Analysis in Concrete Cover Arbitration

A tribunal normally follows this approach:

Step 1: Determine Contract Requirement

Questions:

• What cover thickness was specified?
• Which standard applied?
• Were tolerances permitted?

Step 2: Determine Actual Condition

Evidence:

• cover meter reports;
• photographs;
• inspection certificates;
• expert reports.

Step 3: Determine Responsibility

The tribunal examines:

Step 4: Assess Remedy

Possible awards:

A. Repair Costs

Examples:

• concrete jacketing;
• protective coatings;
• corrosion inhibitors.

B. Reduced Value Damages

Where service life is reduced.

C. Replacement Costs

For severe structural defects.

D. Declaratory Relief

Where no immediate damage exists.

8. Defences Based on Durability Assessment

Contractors increasingly rely on expert evidence showing:

• actual chloride resistance;
• concrete permeability;
• remaining service life;
• absence of corrosion.

Tribunals may reject expensive repairs if:

• the structure remains safe;
• durability objectives are achieved through alternative methods.

9. Arbitration Drafting Lessons for Marine Concrete Contracts

Contracts should clearly specify:

Concrete Requirements

• minimum cover thickness;
• allowable tolerance;
• testing procedures;
• acceptance criteria.

Responsibility Allocation

The contract should identify:

• design responsibility;
• inspection responsibility;
• repair obligations.

Expert Determination Clause

Technical disputes may first go to:

• independent marine engineer;
• durability specialist;
• dispute adjudication board.

10. Conclusion

Arbitrations concerning incorrect concrete cover in marine structures are primarily technical construction disputes involving contractual interpretation, engineering evidence, and risk allocation. The key question is not merely whether cover was deficient, but whether the deficiency constitutes a contractual breach causing measurable loss.

Modern arbitral tribunals generally adopt a balanced approach:

• enforcing contractual specifications;
• relying on expert evidence;
• distinguishing cosmetic deviation from structural failure;
• awarding proportionate remedies.