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Honeycomb Repair

posted Jul 20, 2019, 7:54 AM by jeffery jim

The second query for this morning is in regards to honeycomb repair - coming from Singapore. A Professional Engineer from Singapore requested the contractor to rectify concrete structure with honeycomb post concreting. Repair work is fairly or relatively easy but it comes with a set of questions like how durable, bonding issues and miscellaneous.

The bonding between freshly repaired grout or concrete and the existing concrete infill and cover can be established by using bonding agent instead of using just cement slurry. There is a caveat to this context. The surface to receive both bonding agent and the fresh grout or concrete should have jagged surface and free from feather edge. The application should be based on MDS provided by manufacturer. If bonding agent does not suffice the requirement or the so-called Supervision Officer, you can include J-dowel for additional grip. But that is taking it to another level which is clearly needless. Concrete is intended for situation under compression and not the rest, therefore the issue with concrete strains is less likely to cause issues when under other stresses. Second worthless justification one can do is to do pull out test for the bonding agent to ensure it is complied with what is reported in the MDS.

After making repair for the affected structure, the integrity of the structure can be tested by using Ultrasonic pulse to ensure there is no honeycomb or void after repair. As for the concrete compressive strength, a normal sampling during batching is good enough to give clear indication of the characteristic strength achieved by the fresh concrete or grout.

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