what are the parameters to check or consider when select a bonding agent for old concrete with fresh concrete or apply to avoid cold joints when a continuous concrete pouring for raft or Silo.
There are several companies supplying bonding coat for enhancing bonding between old and fresh concrete which requires following special requirement;
It must have certain pot life so that this can be applied in time.
While pouring concrete it must remain tacky so that bonding action is achieved.
While applying this the surface must be free of dust and oil and it should be wait but surface dry to preven sudden drying of surface while applying this coat
Important points were mentioned by Gilberto Garcia Del Angel. You should also consider other points .
Check the drying time of the bonding agent. Depending on the project requirements, a fast-drying bonding agent may be preferred to minimize construction delays. Consider the temperature resistance of the bonding agent. It should be able to withstand the temperature conditions during construction and throughout the service life of the structure. Compare prices and evaluate whether the benefits provided by the bonding agent justify its cost. Consider whether the bonding agent is compatible with the formwork used for the construction. It should not react with or damage the formwork material. Evaluate the ease of application of the bonding agent during continuous pouring. It should be applied in a manner that ensures uniform coverage and proper bonding between the concrete layers. The bonding agent should provide sufficient bond strength to prevent the formation of cold joints and ensure structural integrity.
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