Effect of composition CaCO₃/polyurethane (PU) on contact angle of the surface and compressive strength of mortar

Abstract Infrastructure development, especially in the field of construction material technology, one them is mortar. The water content greatly determines energy performance and durability Water can enter building materials or mortar through rain. Damage caused by moisture common, areas with high content. To solve this problems, a hydrophobic water-repellent was created, which using additive, namely CaCO3/PU. purpose research to determine effect composition CaCO3/PU on surface contact angle strength. This uses spray coating method. layer made various compositions 5%, 10% 15% carbonation temperature used 60°C an oven. resulted optimum at PU variation 120.8936° compressive strength 187,68 kg/cm 2 CaCO3 immersion.