Abstract
Geopolymer, as a more sustainable binder material alternative to conventional Portland cement, is attracting attention in the construction industry. One reason is that the production of geopolymer concrete releases less carbon dioxide, and helps to consume a portion of the by-product from power plants and steel production. In the application aspect, it has better mechanical properties as well as being fire and chemical resistant. However, current applications of geopolymer concrete are focused on precast and cast in situ concrete, and it is rarely used as sprayed concrete. This study is aimed at investigating the use of sprayed fibre-reinforced geopolymer concrete as an application in underground construction. The results indicate that the post-crack performance of sprayed geopolymer concrete is comparable to cast geopolymer concrete. Further to that, there is potential for the use of geopolymer concrete to be extended to sprayed concrete in underground construction with current techniques.
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