The IS 13826 Part 2:1993 outlines the standardized procedure for evaluating the pliability of bitumen-based felts utilized in waterproofing and damp-proofing. This test is crucial for manufacturers and professionals to verify the material's resistance to cracking or damage during handling, thereby ensuring its durability and effectiveness in construction applications.
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The IS 13826 Part 2:1993 outlines the standardized procedure for evaluating the pliability of bitumen-based felts utilized in waterproofing and damp-proofing. This test is crucial for manufacturers and professionals to verify the material's resistance to cracking or damage during handling, thereby ensuring its durability and effectiveness in construction applications.
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Per IS 13826 Part 2 (1993), the conditioning temperature varies depending on the bitumen felt type, as specified in the relevant Indian Standards—IS 1322 for hessian-based felts and IS 1793 for glass fibre-based felts. Generally, samples are conditioned at 15°C for three hours prior to testing, ensuring consistent pliability evaluation. The exact temperature should be confirmed according to the felt type's specific standard, with immediate testing following conditioning.
According to IS 13826 Part 2 Clause 4.1, the pliability test uses a metallic mandrel with a diameter between 50 mm and 75 mm, fabricated from an appropriate pipe or bar. One end of the mandrel is slotted to allow insertion of the bitumen felt strip. This setup enables uniform bending of the sample to assess its flexibility by checking for cracks or damage after unrolling.
The pliability test, as defined in IS 13826 Part 2, evaluates the felt's ability to resist cracking when unrolled after conditioning at specified temperatures. A bitumen felt passes if no visible cracks or fractures exceeding 5 mm appear upon unrolling on a smooth surface. The test is qualitative, relying on visual inspection following conditioning as per the relevant IS standards.
For IS 13826 Part 2, ten test specimens should be cut from each bitumen felt sample with dimensions of 25 mm width and minimum 250 mm length. Five specimens must be oriented longitudinally and five transversely. These samples are conditioned for three hours at the specified temperature according to the felt type, then tested immediately to ensure consistent and representative pliability results.
The pliability test is one part of the comprehensive IS 13826 series which collectively evaluates various performance aspects of bitumen felts. While the pliability test (Part 2) assesses flexibility and resistance to cracking, other parts of the standard cover tensile strength, storage adhesion, water pressure resistance, heat resistance, water absorption, and binder content. This integrated approach ensures overall quality and suitability of bitumen felts for waterproofing applications.
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