Joint Fillers

Joint Fillers

Definition:-“Joints fillers are the strips of some compressible material which is used to
fill the expansion joints in different structure “.
Joint filling is an important process in many structures such as Buildings, Masonry Walls.
Highways, Dams, Reserviover et cetera.
A joint filler for use in joints between structural elements comprising: at least one layer
of a substantially non-compressible, moisture blocking material; at least two layers of a
compressible and resilient, moisture blocking material, each layer being in surface to
surface contact with a layer of non-compressible material; the layers of material are
combined to form a strip of interleaved compressible and non-compressible layers, and in
an uncompressed state thicker than a joint.
The followings are the different requirements of good joint filler.

• The ability to create an effective water seal.
• It should absorb the impact and shock of heavy loads and steel wheeled traffic,
• preventing erosion of control joint edges.
• The ability to expand and contract, as the joint widens or narrows in response to
• environmental or other conditions, while maintaining an effective seal against the
• sides of the joint.
• It should be durable and economical.
• The ability to flex in every direction, as the joint flexes due to structural
• conditions, loading, or environmental conditions, while maintaining an effective
• seal against the sides of the joint;
• It must give aesthetically acceptable appearance;
• the capability of being installed in a joint by fairly unskilled labour;
• It must posses’ long life, Wear resistant, durable and resilient; it does not harden
• or become brittle with age.
• The ability to adhere to numerous surface materials, such as concrete, steel, or
• aluminum without extensive or expensive surface preparations.
• The ability to fit into joints of a large variety of widths.
• It must posses’ Small density, high recovery rate, with independent air bubble
• structure.
• Low surface water absorption rate with good seepage resistance.
• Good resistance to corrosion of acid, alkali, salt and oil among other organic
• solvents and good resistance to aging.
• No flowing under high temperature and no cracking under low temperature.
• Flexibility provides for joint movement and protects slabs edges from chipping
• Cures on damp or wet surfaces
• Penetrates and fills without running
• Flexible enough to absorb hard heavy wheeled traffic.
• The ability to reduce stress cracking and telegraphing.
• The ability to bonds tightly to the sides of the concrete joint prevents contaminant
• penetration and delivers high wear resistance and durability.
• It should be environment friendly.
• It must have uniform consistency with no measurable shrinkage.
• It must posses’ adequate tensile strength. As tensile strength relates to the
• capacity of this material to hold together when stretched. Percentage tensile
• elongation is the length the material can be stretched before failure.
• It must deliver adequate support to joint shoulders receiving the force of hard

wheel traffic carrying heavy loads.

• Delivers tight bond to faces of joint