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The production of sustainable cements, which include alkali-activated materials (AAMs), is important in the light reducing CO2 emissions. AAMs are produced using precursors with high aluminum, silica, and calcium contents in an alkaline solution and can be divided, based on the precursor type, into two major groups: (1) high-calcium binder and (2) low-calcium binder. The two types of binders have different characteristics, properties, and dosage methods. Therefore, this article reviews AAMs that support the choice of precursor based on its prospective characteristics. Initially, the dosage parameters, precursors, activators, and curing conditions, are discussed. Subsequently, a comparison is made between the fresh, mechanical, and durability properties of high- and low-calcium AAMs. It is concluded that low-calcium AAMs show better performance in terms of durability and fresh properties. By contrast, high-calcium AAMs exhibit better performance in terms of mechanical properties. Therefore, it is concluded that the choice of the type of precursor must be made by considering the conditions to which the material will besubjected.
Innovative Infrastructure Solutions – Springer Journals
Published: Apr 1, 2022
Keywords: Alkali-activated materials; Sustainability; Technical knowledge; Review
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