MATEST - B053 - Binder Adhesion Test

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MATEST - B053 - Binder Adhesion Test


A binder adhesion test is a crucial evaluation performed to quantify the bond strength between a binder material and a substrate. This is particularly vital in fields like civil engineering (asphalt pavements), coatings, and various manufacturing industries, where the durability and performance of a product heavily rely on the integrity of this bond.

Binder Adhesion Testing Important ?

Durability and Performance : A strong bond between the binder and the substrate is essential for the long-term performance and durability of the material. For example, in asphalt pavements, poor adhesion between bitumen and aggregate can lead to "stripping" (the separation of the binder from the aggregate due to water), causing premature pavement failure, such as ravelling.

Moisture Damage Resistance : Many binder adhesion tests are designed to assess how well the bond holds up in the presence of moisture, which is a common cause of material degradation.

Material Compatibility : These tests help evaluate the compatibility between different binder types and various substrates (e.g., different types of aggregate in asphalt).

Quality Control and Specification : Adhesion tests are used in quality control to ensure that materials meet specific performance requirements and to guide the selection of appropriate binders and additives.

Research and Development : They are indispensable for developing new binder formulations and understanding the fundamental mechanisms of adhesion.

Common Types of Binder Adhesion Tests :

Binder adhesion tests can vary significantly depending on the application and the type of binder and substrate. Some common methods include :

       1. Pull-Off Test (Binder Bond Strength - BBS Test) :
    • This is a widely used method, particularly for asphalt binders.
    • A pull-out stub is adhered to the binder (which is on a solid substrate).
    • A tensile force is applied to the stub perpendicular to the surface until failure occurs.
    • The test quantifies the tensile force required to remove the stub, providing a measure of bond strength.
    • The mode of failure (adhesive, cohesive within the binder, or cohesive within the substrate) is also observed.
    • The "Pneumatic Adhesion Tensile Testing Instrument (PATTI)", often used in conjunction with the BBS test, applies a pneumatic load.
    • Standards like "AASHTO T 361" incorporate the BBS test.
       2. Static Immersion Test / Stripping Test :
    • This is a simpler, empirical test often used for bitumen-aggregate systems.
    • Aggregates coated with the binder are immersed in water (often at an elevated temperature).
    • After a specified period, the percentage of stripping (uncovered aggregate area) is visually estimated.
    • It helps classify aggregates as hydrophilic (lose coating in water) or hydrophobic (retain coating).
    • A modified version can measure mass loss due to moisture conditioning of a loose hot mix asphalt (HMA) mixture.
       3. Rolling Bottle Test (RBT) :
    • (According to EN 12697-11A)
    • Bitumen-coated aggregate stones are subjected to mechanical abrasion under water in a rolling bottle.
    • The residual coating on the aggregate is visually assessed after a set time (e.g., 6 or 24 hours).
       4. Cross-Cut (or Cross-Hatch) Test :
    • Commonly used for coatings (paints, varnishes) on flat surfaces.
    • A grid pattern is cut through the coating into the substrate.
    • Adhesive tape is then applied over the grid and rapidly removed.
    • Adhesion is visually assessed based on how much of the coating is removed within the cut area (e.g., using ISO or ASTM classifications).
       5. Scratch Hardness Test :
    • Also for coatings, this test involves guiding a weighted pin or chisel against the coated panel until the paint layer detaches from the substrate.
    • The adhesion is primarily evaluated visually.
       6. Contact Angle Measurements :
    • A more fundamental approach based on surface free energy theory.
    • Measures the contact angle of a binder droplet on a substrate surface.
    • A smaller contact angle generally indicates better wetting and thus better adhesion.

7. Dynamic Immersion/Wheel Tracking Tests (e.g., Hamburg Wheel-Track Device Test - AASHTO T 324) :

    • While not a direct adhesion test in the same way as a pull-off test, these tests evaluate the moisture sensitivity and rutting resistance of compacted asphalt mixtures, which are strongly influenced by     binder - aggregate adhesion. They simulate traffic loading under wet conditions. 

MATEST - B053 - Binder Adhesion Test

The selection of a specific binder adhesion test depends on the material, the application, the properties being evaluated (e.g., dry adhesion, wet adhesion, curing rate), and the relevant industry standards

BINDER ADHESION TEST - Code : B053

Click Here : Binder Adhesion Test Brochure

Standard Method : EN 12272-3 | NF P98-274-1

Used to evaluate the global adhesion and the active adhesion between bitumen and aggregates for road surfaces realization. The equipment is formed by:
  • Six metal test plates
  • Steel ball weighing 512 g
  • Metallic base with three
  • vertical support points and metallic rod 500 mm high
  • Metallic hand operated roller,
  • rubber lined with lead shots ballast.
  • Weight: 40 kg approx.
SPARE: B053-01 Metal test plate.
  • B053 - Binder Adhesion Test
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MATEST - B053 - Binder Adhesion Test

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Click Here : Binder Adhesion Test Brochure
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