In PU injection grouting, a specialized polyurethane grout is pumped through packers into drilled holes in concrete to fill voids, stabilize soil, and lift sunken slabs. The two-component (or single) material expands upon injection, exerting controlled pressure to re-level foundations, correct settlement issues, and densify loose soil beneath structures. Cleaner and faster than cement... https://shakuraconstruction.sg/pu-injection-grouting-singapore/