GROUTING WORKS

PT Tendon Remedial Grouting

Slabtec has a strong background in post-tensioned concrete.

Ungrouted or poorly grouted post-tensioned tendons represent a risk to the strength and serviceability of a structure. Slabtec offers full forensic investigations to check and determine the extent of any non-compliant grouting and utilises a variety of techniques to re-grout the tendons.

Depending on the application, grout is reinstated by hand pumps, powered pumps, and custom vacuum techniques where access is difficult or restricted.

Temporary Movement Joints (TMJs) in PT Slabs 

TMJs are a very common method of providing temporary isolation for PT slabs.

With site-assembled PT duct-based sleeve systems, it can be particularly difficult to ensure the dowel sleeves are correctly grouted.

Poorly grouted dowel sleeves can significantly affect the load-carrying capacity of the joint and represent a serious durability risk.

Slabtec can investigate the grout quality in dowel sleeves and, where necessary, re-grout the dowels and also reseal and re-grout the joint itself as is most often required. 

Proprietary Permanent Formwork Wall Systems

Inadequate concrete placement techniques can result in substantial voids in load-bearing walls; in many instances, these can only be noticed if systematic checking processes are applied.

Slabtec can identify and remediate voids with high-strength non-shrink grout placement with a variety of products and techniques based on design strength requirements and void sizes.

Precast panel joints and the bed grout are critically important in both load-bearing and non-load-bearing applications. Poor installation techniques and limited QA processes on the bed grout material often result in poor load-bearing capacities.

External shiplap joints are a more complex detail that can increase risk if appropriate bed grouting processes are not followed correctly.

Slabtec has re-grouted many panel joints in non-load-bearing, load-bearing and even transfer panels.

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.

Complete grouting of vertical grout sleeves is critical for the strength and serviceability of the structure. However, Slabtec has seen instances where corners have been cut at the site level, and grout inlet points in the panel have been sealed over without filling the grout sleeves. 

GPR techniques can be used to identify ungrouted dowel sleeves where plastic-based sleeves have been adopted, and a variety of grouting techniques are available to re-grout the sleeves.

Remedial placement techniques are critical here to ensure pumped liquid grouts reinstate the full void against the soffit of the precast.

Slabtec has used both cementitious and epoxy-based grouts to high-strength bedding grouts for machinery bases and structural steel endplates.

Engineers often specify grout filling of steel RHS or SHS sections. Slabtec has experience in grouting steel sections in both vertical and horizontal applications.

Slabtec-remedial-grouting
Grouting+Stress+Bar+Barrangaroo
Slabtec Transfusion Flat Jacks