PU injection grouting is commonly used to repair leaking concrete structures by sealing cracks and joints from the inside. The polyurethane material is injected through drilled holes, allowing it to penetrate deep into the damaged area. As it expands, it blocks water paths and forms a flexible waterproof seal. This technique is suitable for underground structures, water tanks, foundat... https://shakuraconstruction.sg/pu-injection-grouting-singapore/