Fly ash for sustainable construction: A review of fly ash concrete and its beneficial use case studies

•Fly ash can be utilised as a cement replacement, reducing cement usage, thus environmentally and economically beneficial.•Fly ash makes concrete workable; increasing its levels may reduce water demand and superplasticizer needs.•Fly ash can improve mechanical and durability parameters of concrete.•Fly ash concrete can perform better against chloride, sulfate and acid attacks and can improve corrosion resistance.