Various gas transport properties in concrete considering transporting mechanisms and testing methods-A review

•The mechanisms of various gas transports in concrete are analyzed comprehensively.•The testing methods of various gas transports in concrete are compared and analyzed.•Correlation analyses are executed for inert-gas, water and carbonization in concrete.•Various factors affecting inert-gas permeability in concrete are analyzed in detail.•The current challenges of concrete gas transport are proposed for subsequent work.