What is the principle behind this test method?

The test uses solvent extraction to dissolve and remove the bitumen binder from a pre-weighed felt sample, allowing the binder's mass to be determined by the difference in weight.

Why is determining binder content important for bitumen felts?

Binder content is a critical quality parameter that directly influences the felt's waterproofing effectiveness, flexibility, and durability. Incorrect content can lead to premature failure.

What equipment is essential for this test?

A Soxhlet extraction apparatus, an analytical balance, and a laboratory oven are the primary pieces of equipment required as per the standard.

What is the typical specimen size for the test?

The standard recommends a test specimen with an area of 100 cm² (e.g., 100 mm x 100 mm).

IS 13826

: 2000

Bitumen-based felts - Methods of the test, Part 7: Determination of binder content

CurrentSpecializedTesting MethodMaterials Science · Waterproofing and Damp-Proofing

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This standard specifies the method for determining the binder content in bitumen-based felts used for waterproofing. The procedure involves using a solvent in a Soxhlet extraction apparatus to separate the soluble bitumen binder from the base fabric and insoluble mineral matter.

Bitumen-based felts - Methods of the test, Part 7: Determination of binder content

Quick Reference Values

Sample drying temperature105 ± 5 °C

Test specimen area100 cm²

Analytical balance accuracy0.001 g

Key Formulas

Binder Content, % by mass = ((M1 - M2) / M1) * 100

Practical Notes

This is a destructive test primarily used for quality control by manufacturers and for third-party verification.

Ensure adequate ventilation and use appropriate personal protective equipment (PPE) when handling solvents like trichloroethylene.

The accuracy of the result is highly dependent on drying the sample to a constant mass before and after extraction.