construction Technology: general issues 12 circular economy 7 sustainability 7 History of engineering & technology 6 life cycle assessment 5 optimization 5 CO2 emissions 4 building 4 compressive strength 4 energy efficiency 4 maintenance 4 recycling 4 waste management 4 Research & information: general 3 buildings 3 durability 3 mechanical properties 3 multi-criteria decision-making 3 sustainable construction 3 sustainable development 3 urban regeneration 3 BIM 2 COVID-19 2 History 2 Industry 4.0 2 MCDM 2 UAV 2 analytic hierarchy process (AHP) 2 biomass 2