The present invention is an aerated concrete admixture including a matrix of substantially evenly sized and evenly distributed gas filled voids within a geopolymer material, wherein the gas filled voids substantially maintain their position and shape, both during and after the completion of the curing process of the geopolymer. The aeration is introduced into the geopolymer by way of a foam that is gently blended into the admixture so that it is able to maintain its aeration effect on the geopolymer. A plurality of fine polymer fibres may both, or individually, be included in the geopolymer, and the fine polymer fibres are substantially evenly distributed throughout the geopolymer material and interspersed between the matrix of gas filled voids.
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