A car dealer occupies a commercial warehouse building constructed in 2004 and divided into 2 showrooms, which include an office area. Settlement of the tile flooring in two rooms was already observed in 2011 and was attributed to self‑compaction of the foundation soil, largely due to excavation and demolition during construction. The industrial area is located in a district that, for many years from 1980 to 2000, was used for waste disposal. The backfill reaches a thickness of 15–25 m. All structures in this area are built on piles or on a concrete slab with load distribution. The most common problem due to uneven settlement is the separation of pile‑supported foundations from industrial floors in the form of slabs. In this case, the settlement zone is formed by a floor approximately 15 cm thick with welded mesh.

The goal was to achieve maximum efficiency using Uretek Deep Injection technology to consolidate the foundation to the depth of stress propagation and then use Uretek Slab Lifting technology to make localised injections directly under the slab of the affected areas to fill voids and restore contact between the subbase and the slab.

The process of applying deep strengthening technology consists of compacting the foundation at depth (up to 9 m if necessary) by injecting geopolymers with high expansion force. In areas with pronounced settlement, 20 injections were performed starting from a depth of -3.00 m using Uretek Deep Injection technology. The materials expand and compact the surrounding soils “to refusal”, increasing the density characteristics and, consequently, the bearing capacity of the soil itself. By applying slab lifting technology, Uretek keeps all of the client’s work processes running. That is, the organisation can continue to generate its income while the contractor fills voids by injecting its unique polymer materials, developed specifically for this type of work. To preserve the floor during drilling, injection tubes of 6 mm diameter were used wherever possible. Holes were made in the gaps between tiles to avoid creating holes in the tiles themselves or damaging them. Thus, the damage becomes barely noticeable, and the process itself is less expensive and non‑invasive. The work area can be used immediately after the injection process is completed. Before starting any work, it was necessary to assess the voids by performing certain tests during the survey. During the work, the floor level was continuously monitored using a laser level sensitive to millimetre movements.

Two tests were carried out on the restored areas: one before and one after the work to verify the increase in soil bearing capacity. The geopolymers, with their expansion force, strengthened the weak areas and restored contact between the base and the floor. In some areas of the treated surface, where necessary, a controlled lift of up to 3 cm was performed. The success of the project was verified by geodetic surveying, which could detect millimetre deviations after the work. Stabilising 875 m² of floor took 8 working days.