Admixture composition for the production of lightweight concrete containing polystyrene beads, process for the preparation of the composition and its application

An admixture composition comprising:

• dissolved polystyrene beads, and
• a mixture of organic and inorganic materials, wherein said mixture of organic and inorganic consists of a liquid reaction product or a solid composition prepared from the reaction of the following components:
• at least one glycol copolymer compound, wherein said at least one glycol copolymer compound is obtained by a base-catalyzed polymerization reaction of alkyl glycol compounds, in an amount of 15-10 w/w %,
• at least one glycol polymer-silica compound, wherein said at least one glycol polymer-silica compound is obtained by a base-catalyzed reaction of alkyl glycol and organic and inorganic silicon compounds respectively, in an amount of 45-50 w/w %,
• a two-component polyurethane-based synthetic resin, wherein component A is polyol and component B is isocyanate, in an amount of 13-22 w/w %, in an organic medium which is prepared from a polymerized aromatic monomer compound containing polystyrene obtained from polymerization of styrene monomer or a polymerized unsaturated double bond containing aromatic polymer dissolved in an organic solvent, in an amount of 2-3 w/w %, and
• foam glass beads in an amount of 25-15 w/w %;
• wherein said liquid reaction product comprises organic solvents in an amount of 15-20 w/w %, and water in an amount of 10-5 w/w %, based on the total weight of the above composition;
• and
• wherein said solid composition comprises polyvinyl alcohol in an amount of 10-5 w/w %, aluminum hydroxide in an amount of 2-5 w/w %, and calcined limestone flour in an amount of 8-10 w/w %, based on the total weight of the above composition.