Polyurethane (PU) injection grouting excels in sealing water leakages through concrete cracks and expansion joints. Specialized hydrophobic or hydrophilic PU grouts are pumped via packers into pre-drilled holes, where the material quickly cures into a resilient foam or gel. Hydrophobic types repel water and expand to block high-volume flows, while hydrophilic varieties bond strongly i... https://shakuraconstruction.sg/pu-injection-grouting-singapore/