INTRODUCTION
BNS-GROUT is an admixture for grouting ducts in post tensioned prestresses concrete structures. It ensures permanent contact and an excellent bond to entire grouted surfaces. The expanding properties decrease the natural settlement before the starting of initial set and shrinkage of the grout. The plasticizing effect helps plasticizing the grout so that a good workability and a proper grouting operation is achieved. Within 3 days after grouting a high frost-resistance is obtained which fulfills the regulations for grouting prestressed structures.