The problem of the adhesion, or better to say: lack of adhesion, of fresh concrete to hardened concrete is well known. The discontinuity line formed between the two cast elements is a source of many deficiencies: it is a week zone mechanically and a potential "leak" zone as far as the waterproofing of the structure is concerned.

This work investigates the possible use of polymers as binders and adhesion promoters when applied on the line of the casing interruption.

The polymers used include:

- aqueous emulsion of polyvinyl-acetate, polyacryl-esters and styrene-butadiene-rubber

- epoxy resins and water based epoxy resins

The various materials were used as fresh (non-cured) or hardened (cured) systems on the first stage hardened concrete during the casting of the second stage fresh concrete.

The effect of the various polymer systems on the adhesion of the two concrete elements and their contribution to the contact between them was tested by their shear strength, flexure strength and pull-off strength of adhesion.

The presentation will report the results of the adhesion properties of the various treatments and applications using the polymers.

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