Evaluation of One-Part Geopolymer Mortars as Protective Sewer Coating for Sewer Assets
Cherdphong Seedao, Ye Jun In, Matthew Fisher, James Gardner, Marjorie Valix
Abstract
This study evaluated the suitability of various commercially available geopolymer mortars (GP) for application in a sewer environment. Corrosion of one-part geopolymer mortars was compared with commercially available calcium aluminate cement through a series of accelerated corrosion and field tests. Accelerated corrosion was undertaken by immersing mortar cubes in sulphuric acid (pH 1, 9.8g 99% H2SO4 in 1 L of water) at 30°C for up to 28 days. Field tests involved installing the mortars in sewers for up to 12 months with 129 ppm H2S, 2700 ppm CO2, 30 °C, and 99 %RH. Corrosion resistance was established from the depths of corrosion and residual compressive strength of the mortars. The corrosion performance of the mortars showed dependence on the cement chemistry and composition of geopolymers, specifically the calcium contents. This study demonstrated the suitability of various geopolymer coatings for sewer application.
Full paper available to ASTT members
The abstract above is open to everyone. Sign in with your ASTT membership email to open the full PDF.
Techniques
Member companies
Corporate members delivering Surface-applied Lining
Underground ExpertsRelining works
Systra ANZSystra are underground engineers providing multi-disciplinary services to the transport, infrastructure, energy, utilities and mining sectors. We bring confidence to significant project decisions in a challenging delivery environment. In the trenchless space our services encompass consulting, client