A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Spray-applied waterproofing membranes in tunnelling: Application and research directions in Australia
Highlights Spray-on waterproofing membranes in tunnels have gained popularity. Several crucial factors need to be considered for a successful implementation. Spray-applied waterproofing membranes are not suitable for all conditions. Long-term composite action between membrane and tunnel linings is not reliable. Membrane behaviour under different parameters still requires further research.
Abstract The use of spray-applied waterproofing membranes in tunnelling infrastructure projects has gained popularity over the last two decades internationally and within Australia. The seemingly easy, seamless, and fast application process makes them desirable, promising a time- and cost-effective waterproofing solution. The spray-application is particularly attractive for difficult underground excavation geometries and in areas where a high number of penetrations through the membrane are required. However, spray-applied waterproofing membranes are a reasonably new development within the tunnelling industry, for which the materials and testing requirement are not yet standardised, and only limited test data exists. The ease of application of these membranes can be deceiving, the substrate preparation, as well as the installation itself, require good planning, quality control and experience. The application of spray-on material under wet conditions is restricted, as are the options for comprehensive quality and continuity testing for most materials. Effective approaches for penetrations through these membranes, membrane terminations as well as transition zones to other waterproofing solutions depend on many factors and require investigation and trials. One perceived and advertised advantage of spray-on membranes is the bond to the structural linings and potential for optimisation in lining thicknesses. Yet the achieved bond depends on many factors and the degree of composite action for such linings over the design life of a structure is uncertain. Typically, a conservative approach for the design and installation is taken. This paper outlines a state-of-the-art literature review of sprayed-on water membranes, with the focus on quality assurance, material properties and challenges for membrane application in large construction of underground infrastructure projects. It highlights open questions which needs to be answered by all parties involved into the construction process, from the product supplier to the designer and finally to the constructor; and suggests directions for further research.
Spray-applied waterproofing membranes in tunnelling: Application and research directions in Australia
Highlights Spray-on waterproofing membranes in tunnels have gained popularity. Several crucial factors need to be considered for a successful implementation. Spray-applied waterproofing membranes are not suitable for all conditions. Long-term composite action between membrane and tunnel linings is not reliable. Membrane behaviour under different parameters still requires further research.
Abstract The use of spray-applied waterproofing membranes in tunnelling infrastructure projects has gained popularity over the last two decades internationally and within Australia. The seemingly easy, seamless, and fast application process makes them desirable, promising a time- and cost-effective waterproofing solution. The spray-application is particularly attractive for difficult underground excavation geometries and in areas where a high number of penetrations through the membrane are required. However, spray-applied waterproofing membranes are a reasonably new development within the tunnelling industry, for which the materials and testing requirement are not yet standardised, and only limited test data exists. The ease of application of these membranes can be deceiving, the substrate preparation, as well as the installation itself, require good planning, quality control and experience. The application of spray-on material under wet conditions is restricted, as are the options for comprehensive quality and continuity testing for most materials. Effective approaches for penetrations through these membranes, membrane terminations as well as transition zones to other waterproofing solutions depend on many factors and require investigation and trials. One perceived and advertised advantage of spray-on membranes is the bond to the structural linings and potential for optimisation in lining thicknesses. Yet the achieved bond depends on many factors and the degree of composite action for such linings over the design life of a structure is uncertain. Typically, a conservative approach for the design and installation is taken. This paper outlines a state-of-the-art literature review of sprayed-on water membranes, with the focus on quality assurance, material properties and challenges for membrane application in large construction of underground infrastructure projects. It highlights open questions which needs to be answered by all parties involved into the construction process, from the product supplier to the designer and finally to the constructor; and suggests directions for further research.
Spray-applied waterproofing membranes in tunnelling: Application and research directions in Australia
Pelz, Ulrike (author) / Karlovšek, Jurij (author)
2022-01-04
Article (Journal)
Electronic Resource
English
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