Dealing with high water pressure during slab-pouring is a real challenge.
When facing the challenge of pouring a slab on ground with exceptionally high water pressure, it’s crucial to act swiftly and seek professional advice. Each situation may present unique variables, but based on our own experiences, we can offer some professional insights.
Before confirming the pour location, it is crucial to thoroughly identify and map out all water sources. This allows for informed decisions on the need for temporary wells, pumps, concrete mix refinement, or a combination of strategies to effectively manage the water, based on the flow rate from each source.
In addition, a thorough examination of the suitability of the originally designed waterproofing system is paramount. Swift action may be required to adjust the waterproofing system to align with the prevailing conditions. Furthermore, a comprehensive review of the concrete mix is essential to ensure the inclusion of anti-washout admixtures, or a marine mix, especially if pouring into water is unavoidable.
It is imperative to avoid pouring concrete onto water, as this can lead to the formation of undesirable concrete veins. Instead, the self-weight of the concrete should be leveraged to expel trapped water by pouring in thick layers. If the water pressure remains prohibitively high, the installation of conically shaped formwork and simultaneous water pumping during pouring can be considered. Remediate the wells 7 to 14 days later.
These recommendations are generalised and may require further tailoring based on the specific requirements of the project at hand. Therefore, for a tailored approach, it is advisable to engage in a detailed discussion to address project-specific considerations and other potential strategies to manage high water pressure during slab pouring.
In conclusion, when faced with high water pressure during slab pouring, it is imperative to carefully assess all factors, seek timely professional advice, and remain adaptable in addressing the challenges at hand.
