A: As shown in Figures A and B, after the renovation, due to the poor bonding between the old and new concrete, it is especially prone to joint-related leakage.
This is an unavoidable defect that must be prevented beforehand.
Methods for preventing leakage—After the new and old wall structures are grouted and the mold is dried, before painting the primer, the connection points must be identified and repaired, and elastic filling material must be applied to fill the gaps; the installation of the filling material must be done with caution:
(1) The connecting function on both sides.
(2) Flexibility and weather resistance.
(3) It is imperative to first perform waterproofing reinforcement before continuing with subsequent painting work; never reverse the order of the steps.
(4) To prevent the adhesion of subsequent painting work, it must not cause any subsequent detachment phenomenon.
(5) The interior parts will be reinforced with construction-jointed concrete with no shrinkage, and a drainage hole will be pre-drilled. High-pressure or low-pressure grouting will be used.
Used to make PU foam elastic water-repellent material.