Sand is an abundant raw material, but the specific type used for concrete is running out. There is another option though.
Sand is one of the basic materials in the production of concrete. But, although it would seem an abundant material, the type of sand that can be found in the deserts is too thin and smooth to bind properly. And thus, construction companies resort to riverbank sands, a dwindling resource. A group of young researchers from the Imperial College London has devised a method that makes use of desert sands to produce a new construction material with no carbon footprint. They have called it Finite, which refers to the limited construction sand available. They remain tight-lipped, however, about the actual binding agents used to produce their revolutionary concrete. Their next project aims to develop another method to produce glass with common sand too.
Source: Dezeen
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