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Bond Strength or Tensile Strength of Repair and Overlay Materials.

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Evaluating the Adhesion, Compatibility, and Durability of Repair Systems on Concrete Substrates

Bond Strength or Tensile Strength Test for repair and overlay materials is a crucial evaluation to determine how well a repair mortar, overlay, or coating adheres to the existing concrete surface. This test measures the tensile stress required to cause separation at the interface, providing a direct assessment of the adhesion quality, compatibility, and long-term performance of repair systems. At Global Lab, we conduct Bond Strength Testing as per ASTM C1583, EN 1542, and IS 516 (Part 5) standards using precision pull-off adhesion testers. Our NABL-accredited testing ensures accurate data on tensile bond strength, helping engineers, contractors, and material manufacturers validate the reliability of repair and overlay systems under actual service conditions.

Why Bond Strength Matters.

Ensures Durability of Repair & Overlay Systems

A strong bond ensures that the repair or overlay material remains securely attached to the existing concrete, even under mechanical stress, vibration, or thermal movement. A low water permeability significantly reduces chloride transport, preventing corrosion of embedded steel reinforcement and ensuring long-term durability.

Verifies Surface Preparation Quality

Proper surface preparation — including cleaning, roughening, and removal of laitance — is critical to achieving durable adhesion. The test confirms whether the preparation methods used were effective.Concrete with low permeability minimizes sulfate ingress, maintaining its strength and integrity over time.

Assesses Compatibility of Materials

Different repair mortars or polymer-modified systems have varying thermal and mechanical properties. Bond testing ensures compatibility between the substrate and the overlay, reducing the risk of delamination or debonding over time.Concrete with low permeability absorbs less water, making it far more resistant to freeze–thaw deterioration.

Quality Control for Site Repairs & Product Validation

The test provides on-site verification for repair projects and performance validation for manufacturers developing new materials or coatings.Since CO₂ transport depends on moisture movement, water permeability testing is an effective method to gauge the concrete’s carbonation resistance.

NDT TESTING

GL Advantages.

  • Accredited facility: NABL-grade laboratory with traceable calibration and strict QA systems.

  • Standards compliance: Tests performed to ASTM C1202 (Rapid Chloride Permeability Test) and applicable IS/EN methods.

  • Experienced analysts: Concrete technologists who interpret results and recommend mitigation.

  • Fast, reliable reporting: Clear reports with test data, graphs, comparative benchmarks, and practical recommendations.

  • Field + Lab capability: On-site sampling, specimen curing, and post-test consulting.

Global Lab Advantage.

Accredited facility.
Standards compliance.
Experienced analysts.
Fast, reliable reporting.
Field + Lab capability.

Applications

Repair mortars and patching compounds for damaged concrete surfaces.
Polymer-modified and fiber-reinforced overlays for floors and pavements.
Protective and waterproof coatings on structural elements.
Bond evaluation between old and new concrete (composite structures).
Quality control and R&D testing for repair material manufacturers.
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On-Site Testing Across India

Global Lab provides comprehensive testing for construction and engineering materials, including concrete, cement, steel, aggregates, bitumen, soil, tiles, paver blocks, and other civil and infrastructure materials. We also handle customized tests as per client or project specifications.

Yes. Our team is equipped with mobile testing facilities and field instruments for on-site sampling, inspection, and testing — ensuring quick and reliable results without disrupting your project timelines.