Inadequate waterproofing and quality control in the construction of concrete basement foundations can lead to cracks and water leakage on the basement floor. Finding an effective solution has become an urgent issue for management units. This article brings you a practical set of solutions for various entities.
Find the water leakage location
Clean the surface of the underground water leakage area, wipe the surface water stains with a gauze, then sprinkle a layer of dry cement 20-30mm thick. When the surface of the dry cement becomes damp, it indicates that the damp area is the leakage point. If there is no dry cement, lime or flour can also be used as substitutes.
Two: Drainage to Reduce Water Pressure
Choose areas with concentrated leakage, and bury pipes with holes into them to allow water to flow out through the pipes. Depending on the amount of leakage, water can分流 from one or more pipes buried underground. If the leakage point is not found, water can flow down the lower part of the wall.
Section 3: Crack Sealing and Repair
For holes and cracks with obvious base leakage, waterstop treatment should be conducted individually according to the leakage methods for holes and cracks. For the concrete structure surface of basements, when there is a minor slow leakage, polymeric cement slurry can be applied on the backside to form an impermeable covering layer, serving as a waterproofing measure.
For areas with severe leakage and large cracks, grouting methods can be employed. Grouting holes can be set up on the structure based on the leakage situation, with grouting points arranged in a plum blossom, triangle, or single-line pattern. Then, perform the grouting treatment to form a waterproof screen within the structure. Additionally, the "surface-sealed grouting" method can also be used, which involves first leading water through pipes and then sealing the bottom of the grouting pipe with polymer cement waterproof mortar to prevent leakage. Once the mortar strength meets the requirements, start grouting to block water from the lead pipe. Recommended reading: Which waterproofing and leakage prevention company is the best?
Mortar Rendering
Grouting and leak sealing are completed, and the leakage is largely under control. Polymer cement waterproof mortar can be applied to the repaired areas to achieve leveling and beautification effects. Before applying the mortar, for minor residual seepage in the concrete, apply inorganic rapid-setting waterproofing material to the concrete surface, wearing rubber gloves and rubbing repeatedly until the water shadow is no longer visible. Then apply the mortar in three stages until the cracks are no longer visible.
Summary: This concludes the repair plan for groundwater leakage from basement slabs. By combining drainage, sealing, and coating methods, the issue of slab cracks and leaks can be effectively resolved. Of course, the methods require professional personnel for operation. For on-site repair services by a professional waterproofing company, please call Dinglong Tai Waterproofing.
