A Project Engineer was appointed by the contractor to manage crack repair and waterproofing works for a reinforced concrete water tank. During implementation and subsequent performance review, several areas were identified where the approach could be strengthened. A Method Statement was submitted to the RE and I was asked to comment as well.
a) Repair Methods
The repair methods adopted were largely standardised solutions, typically suitable for general concrete repairs. (I think it was copied from some brochures) However, water-retaining structures impose more stringent requirements in terms of watertightness, durability, and long-term performance, which were not fully addressed in the proposed methodology.
b) Strategy
The repair strategy did not explicitly reference recognised standards such as BS 8007 or EN 1992, which are commonly used to guide the design and repair of water-retaining concrete structures. Referencing these standards would provide clearer technical justification and performance assurance. The selection of injection materials was undertaken without documented evaluation of compatibility with the existing structure or confirmation of suitability for permanent wet conditions.
c) Material Ageing
A more structured assessment would help reduce the risk of recurring leakage. Following continued leakage after repairs, the explanation provided focused on the age of the concrete. While material ageing can be a contributing factor, further investigation into crack behaviour, joint conditions, and construction details would be beneficial to establish the root cause and determine appropriate corrective measures.
d) Conclusion
Overall, while the intent of the repair works is acknowledged, the observations suggest that additional specialist input and a more structured technical approach would improve confidence in the long-term effectiveness of the repairs and better protect the Client’s interests.
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