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›› Home › Building Construction & Drawing › Properties of Joints

Structural joints in building constructionProperties of a good sealant

Protection1.

Durability2.

Less expansion3.

Good adhesion4.

Chemical inertness5.

Sound insulation - Air tight6.

Must be of softer grade and not stiff7.

Good wetting behaviour8.

Must be able to absorb thermal stresses9.

Characteristics and Properties of good Joint filler materials

The followings are the different requirements of good joint fillers.

The ability to create an effective water seal.It should absorb the impact and shock of heavy loads and steel wheeled traffic, preventing erosion ofcontrol joint edges.The ability to expand and contract, as the joint widens or narrows in response to environmental or otherconditions, while maintaining an effective seal against the sides of the joint.It should be durable and economicalThe ability to flex in every direction, as the joint flexes due to structural conditions, loading, orenvironmental 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 fairlyunskilled labor;It must posses' long life, Wear resistant, durable and resilient; it does not harden or become brittle withage.The ability to adhere to numerous surface materials, such as concrete, steel, or aluminum withoutextensive 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 goodresistance 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 wetsurfaces

Properties and characteristics of good joint fillers,

joint fillers

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Penetrates and fills without runningFlexible 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 delivershigh 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 tohold together when stretched. Percentage tensile elongation is the length the material can be stretchedbefore failure.It must deliver adequate support to joint shoulders receiving the force of hard wheel traffic carrying heavyloads.Delivers tight bond to faces of joint

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