Precast Columns – Base Grouting
Similar to joint grouting, the bases of precast elements are typically highly stressed zones requiring well-placed structural grout beds.
Stiff grouts are often placed before the element is positioned on the levelling packers, and if the bedding grout is not placed correctly, voids can occur. We have also found occurrences where subsequent re-levelling of the precast on the plastic grout raises one or more areas of the precast, which can also result in voids if the bedding grout is not adjusted accordingly.
Typically, the voids formed are difficult to detect and usually present as thin voids under the soffit of the precast or large voided areas in the precast of large cross sections.
Remedial placement techniques are critical here to ensure pumped liquid grouts reinstate the full void against the soffit of the precast.