Fill voids inside hollow concrete
High-strength grout injection fills honeycomb and voids in columns and slabs — common in rushed Guwahati construction from 2000–2015.
Hollow columns sound fine until they are not
Tap test and UPV reveal voids. Micro concreting packs voids under pressure without demolishing the member.
Services
Pressure grouting
Low-shrink grout injected through drilled ports.
When: Honeycomb in columns, beam pockets, slab voids
Risk: Void leaves steel unprotected — corrosion accelerates.
Often combined with CFRP
After void fill, CFRP wrap restores confinement if section was weakened.
Hollow sound on column? NDT first, then micro concreting if confirmed.