IS 1838

: 2000

preformed fillers for expansion joints in concrete pavement and structure (non-extruding and resilient type) Part 2 CNSL Aldehyde resin and coconut pith - Specification

CurrentSpecializedSpecificationTransportation · Building Construction Practices incl. Painting, Varnishing
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This standard lays down the specifications for preformed, non-extruding, and resilient expansion joint fillers made from Cashew Nut Shell Liquid (CNSL) aldehyde resin and coconut pith. These filler boards are designed to absorb thermal expansion in concrete pavements and structures without extruding above the joint level.

preformed fillers for expansion joints in concrete pavement and structure (non-extruding and resilient type) Part 2 CNSL Aldehyde resin and coconut pith - Specification

Quick Reference Values
Minimum recovery after compression70%
Compression load required for 50% deflection0.7 to 5.2 MPa
Maximum extrusion during compression6.4 mm
Maximum water absorption10% by volume
Maximum reduction in compressive strength after weathering20%
Practical Notes
Ensure the filler board is recessed slightly below the concrete surface to provide adequate depth for the installation of the joint sealing compound.
Store filler boards flat in a dry, well-ventilated space prior to installation to prevent warping, moisture absorption, and dimensional changes.
Prior to placing the concrete, rigidly secure the filler board to prevent displacement or floating during pouring and vibration.