did you know we’re still using a less advanced concrete than they did ... replace modern cement due to the limited supply of fly ash (an industrial waste product produced by burning coal).

did you know we’re still using a less advanced concrete than they did ... replace modern cement due to the limited supply of fly ash (an industrial waste product produced by burning coal).

One alternative is geopolymer concrete, made from alkali-activated aluminosilicate materials like fly ash, slag ... the compressive strength of slag-ash-based geopolymer concrete.