224.1R-07 Causes, Evaluation, and Repair of Cracks in .
Jun 25, 2015 · Similar to mudjacking, the polymer material (usually polyurethane) is injected into holes and cracks in the patio's slabs, and then pumped underneath the surface of the patio, filling all voids and binding with the soil. As the material solidifies, it expands at a rapid rate, and so lifts the concrete surface .Apply only to concrete surfaces that are sound and solid, free of dust, dirt, grease, and oil. New concrete should be cured a minimum of 30 days. Prepare surface by mechanical means to achieve an International Concrete Repair Institute Guideline No. 03732 concrete surface .