Structural Enhancement - RAW MILL SILO

1. Structural Enhancement RAW MILL SILO 1 Radial cracks, further resulting in delamination of concrete 2 Buckled section of the silo (28 mt. Level) 3 PT duct (About 40 % empty) 4 Additional MS reinforcement welded with existing reinforcement and anchored to parent oncrete 5 Patching the damaged concrete section with microconcrete in vertical strips 6 Ongoing repair on the rear side (subjected to tension) 7 Silo after completion of repair Issue Foundation size provided was 641 m2 as against the required 2720 m2. Silo wall thickness was 350 mm. (Structurally sound, but because of the PT duct and the reinforcement, there was no space for pouring concrete.) PT forces applied were 80 % of the hoop forces as against 60%. The PT ducts were filled up to 60-70 % (As per code it should be 97% filled). As a result, the silo tilted, bulged and buckled at 28 mt to 40 mt. level, resulting in unsafe operating conditions. Challenge The entire job was to be completed within 6 months and the work was to be carried out under partial operating condition. The problem of local bursting of concrete was encountered during repair. A major part of work was carried out in summer where the ambient temperature was more than 50°C

2. Solution Designed, modified material and methodology to achieve the desired results Conducted trials on site Grouting of the RCC shell done with high strength epoxies Provided additional reinforcement Patching of the damaged concrete section done with micro concreting. Source: http://www.iccplindia.com/structural-enhancement-raw-mill-silo.html