KR100994833B

PURPOSE: A polymer concrete composition using waste molding sand is provided to secure the excellent physical and chemical properties, by filling the waste molding sand to an unsaturated polyester resin. CONSTITUTION: A polymer concrete composition using waste molding sand contains the following: 40~50 parts of coarse aggregate by weight with over 90% of SiO_2 without pure silica, having the specific gravity of 2.43~2.62; 15~25 parts of waste molding sand by weight with the particle size of 20~200 meshes, and the SiO_2 content of 93~95%; 7~10 parts of unsaturated polyester resin composition by weight; 2~3 parts of shrinkage reducing agent by weight; 5~15 parts of calcium carbonate powder by weight; and 5~15 parts of silicate powder by weight with the fineness of 3,000~3,500 square centimeters/g.