durability Technology: general issues 19 mechanical properties 13 History of engineering & technology 12 compressive strength 10 concrete 9 fly ash 9 microstructure 9 Research & information: general 7 cement 6 circular economy 5 coating 5 strength 5 adsorption 4 construction and demolition waste 4 corrosion 4 degradation 4 energy efficiency 4 flexural strength 4 graphene 4 high temperature 4 life cycle assessment 4 numerical simulation 4 permeability 4 recycling 4 rheology 4 sustainability 4 CO2 emissions 3 SEM 3 artificial neural network 3