Explain the procedure for joining old and new concrete work, also state any two material used for filling joints.

Explain the procedure for joining old and new concrete work, also state any two material used for filling joints.
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1 Answer

Answer :

Procedure of joining old and new concrete: When new concreting is done in continuation with old concrete after a gap of some days, months or even years, then the new and old concrete must have a strong bond with each other. Hence some points should be kept in mind for joining old and new concrete.


Procedure: 1. Cleaning: The old concrete surface is first thoroughly cleaned with wire brush. Loose material if any, should be clean first. 2. Chiseling: The old concrete surface is made rough by denting it with a chisel for a strong bond with new concrete. 3. Application of cement slurry or paste with some admixtures: The surface is then wetted with rich cement slurry. Sometimes an admixture has to be added to give additional strength to the joints. Then fresh concrete is placed over the old concrete. 4. Providing overlap: To give homogeneity to the reinforcing bars, overlap is provided and the overlap portion is bound tightly with high tensile wire.


Material used for filling joints:

1. Asphalt, tar, bituminous materials

2. Fibre and fibre products

3. Sponge rubber

4. Cork

5. Polymer

6. Thermoplastic and thermo-col

7. Glass


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