Structure before commencement of repair (Covered with gunniting treatment)
Damaged concrete surface / core, after removal of gunniting treatment
Damaged core concrete and pre-stressing ducts
Grouting and concrete repair in progress
Preparation of surface mechanically, for further treatment
Anchoring the wrapped surface with fibre anchors
Structure after completion of strengthening
Make OR Break Factor
The surrounding area was very congested and very high safety precautions were undertaken to avoid accidents.
THE CHALLENGE :
- The silo was suffering vertical cracks at several locations as well as delamination of concrete cover, which was leading to a reduction in usable capacity.
THE ODDS :
- Since the core concrete was very weak, the scaffolding couldn’t be anchored to anything and ultimately was erected as a self-supporting structure
- As the entire silo had been repaired with gunniting soon after its construction, it was difficult to assess the extent of actual damage. The only giveaway that was observed was localized bursting of the core concrete
- The silo was still in operating condition
OUR RESPONSE :
- After an intensive condition assessment of the structure, the first step was grouting the cavities of the core concrete
- After that, we patched up the damaged concrete sections
- We then proceeded to externally reinforce the structural elements and then gave the repaired structure a protective coating