What is the minimum recovery required for bitumen-impregnated fibre fillers?

The filler board must recover to at least 70% of its original thickness after being compressed to 50% of its thickness.

What is the maximum allowed extrusion during compression?

The free edge of the filler shall not extrude more than 6.4 mm when compressed to 50% of its original thickness.

What is the required compressive strength?

The load required to compress the board to 50% of its original thickness must be between 0.7 and 3.45 N/mm2.

Which standard specifies the test methods for these fillers?

IS 10566 covers the methods of testing for preformed expansion joint fillers in concrete paving and structural construction.

IS 1838

: 2000

preformed fillers for expansion joints in concrete pavement and structures (non-extruding and resilient type): Part 1 Bitumen impregnated fibre - Specification

CurrentSpecializedSpecificationMaterials Science · Building Construction Practices incl. Painting, Varnishing

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This standard specifies the physical requirements, dimensions, and testing criteria for non-extruding and resilient bitumen-impregnated fibre boards used as preformed fillers for expansion joints in concrete pavements and structures.

preformed fillers for expansion joints in concrete pavement and structures (non-extruding and resilient type): Part 1 Bitumen impregnated fibre - Specification

Quick Reference Values

minimum recovery after compression70%

maximum extrusion at 50 percent compression6.4 mm

compressive load for 50 percent compression0.7 to 3.45 N/mm2

minimum bitumen content35% by mass

Practical Notes

Ensure the filler board is placed slightly below the concrete surface to accommodate the joint sealing compound.

Store filler boards flat on a rigid, dry surface under cover to prevent warping and degradation before installation.

Verify manufacturer test certificates for recovery; a poor recovery rate indicates the joint will remain unsealed when the concrete contracts.