Due to the diminishing fly ash and slag supplies in Australia as a result of global decarbonisation efforts, alternative supplementary cementitious materials (SCMs) are needed to ensure the long-term sustainability of Australian concrete both environmentally and economically. Calcined clays offer an attractive opportunity as an abundant, low carbon and high performance SCM, having been well studied and demonstrated internationally. However, the boundaries of these products are not well understood, particularly considering the millions of tons of clay excavated worldwide for infra-structure projects. Why not explore the possibilities of applying circular economy principles to this issue and upcycling these materials for use as a sustainable concrete solution? Through sampling and characterisation of excavated by-product clays sourced across Victoria, this study aims to clarify the potential new boundaries for calcined clay criteria in concrete. The characterisation results were compared against a consolidated set of relevant academic and industrial compositional criteria for clay used as SCMs. A preliminary clay screening methodology is presented with alternative applications identified for samples with unsatisfactory criteria in order to maximize the valorization of these byproduct materials.
Introduction to AS 2312.3 – Thermal metal spray coatings
June 28, 2024
Standards Australia will soon release the draft of AS 2312 Guide to the protection of structural steel against atmospheric corrosion by the use of protective
