New Breakthrough in Energy Storage – MIT Engineers Create Supercapacitor out of Ancient Materials::Constructed from cement, carbon black, and water, the device holds the potential to offer affordable and scalable energy storage for renewable energy sources. Two of humanity’s most ubiquitous historical materials, cement and carbon black (which resembles very fine charcoal), may form the basis for
Maybe different for different regions but I’m pretty sure foundations will generally have a small amount of steel mesh at a minimum to stop cracking. Someone please correct me if I’m wrong though and hopefully they find a way around this limitation as well. Carbon fibre can also be used from memory but I haven’t seen it that often presumably due to cost.
Maybe for home foundations and the like, glass fiber rebar could be used.