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Other|Stopping subsidence of concrete pools and elimination of cracks
10.03.2020

Water level may drop in concrete pools. In hot summer, it is sometimes explained by natural vaporisation. But it may also result from occurrence of cracks in pool structure due to foundation subsidence.

Problem can be solved by using geopolymers injection.

Unlike other structures, pool structure does not prescribe even minimum subsidence of concrete frame. If the pool subsidence has occurred due to insufficient compaction of soil or excess humidity of the soil under the structure, cracking of concrete is inevitable. As a result of cracking, water starts to leak gradually. This, in turn further aggravates the condition of soil around the pool. It may become unsafe and the site cannot be used any more.

When repairing a pool, just patching the cracks is not enough. It does not remove the initial cause of damage. If the cracks occurred due to weakening of soil under the structure and subsidence of pool frame, it is necessary to address the problems with soil and foundation first.

In that case, soil is strengthened before eliminating cracks, foundation lifted and stabilised if necessary. It is worth noting that when using modern URETEK geopolymers injection methods, the work cycle lasts only a day or two and it does not require earthworks or concrete works.

Deep injection

Cracks in concrete pools can be eliminated by using Deep Injection method, which allows filling cavities and voids in the soil under the pool with special geopolymer resins. After reaching the soil, geopolymers expand and harden quickly, exerting vertical pressure. That way it is possible to strengthen weakened and excessively humid soil under the structure.

Furthermore, geopolymers can be used to stop pool subsidence and stabilise its position, or even lift it to its former height where necessary. Due to their structure, geopolymers do not react with water, but force it into surrounding soil. Therefore, geopolymer resins not only strengthen the soil, but also function as waterproofing material.

Cracks in concrete can be patched only after strengthening soil and stabilisation of foundation.

Works algorithm

Geopolymer resins are injected through special holes (diameter of 12–16 mm), drilled in concrete or soil around pool’s perimeter. Holes are quickly closed after completing the injection.

URETEK geopolymer resins are not destructive. They are suitable for strengthening soil, lifting and levelling concrete structures. Everything related to altering the position of concrete frame is monitored in real time by using laser level (precision up to ±1 mm).

Due to their physical and chemical properties, geopolymers remain stable for a long time, including in humid environment. Material is chemically inert, ecologically safe and tested across the world during long term use.

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