Refurbishment of Buried Assets Using CPL Technology

As many developed countries struggle to keep up with population growth and land-development demands while improving their standards of living, deteriorating sewerage systems are becoming a problem that can no longer be hidden. Although the expansion and upgrading of existing systems is progressing, asset owners have come to realise that it is necessary to minimise their assets' lifecycle costs and to maximise their overall longevity, and have rapidly been adopting corrosion protection liners (CPLs) as a solution for both new sewer structures and the upgrading and restoration of existing ones. CPLs provide crucial protective benefits and may be utilised to maximise asset life and consequently maximise investment returns for most sewerage structures that are potentially susceptible to sulphuric acid damage. Such CPL materials as high-density polyethylene (HDPE) sheet have recently been economically incorporated into the construction of reinforced concrete structures, and it has become clear that similar methods may be employed for remediation works, providing an asset life of more than 100 years. This paper details the requirements for the successful use of HDPE CPLs on concrete rehabilitation works involving existing structures. It will analyse methods for preparing the concrete and applying the CPLs using advance grouting techniques.