Alkali-activated concrete (AAC) is an emerging technology in the construction materials sector. Cement-free AAC is a promising environmentally-friendly alternative to ordinary portland cement (OPC) concrete. A comprehensive study was performed by researchers at Clarkson University to develop energy efficient and environmentally friendly cement-free concrete mixtures for pavement and bridge deck applications. Alkali-activated concrete (AAC) mixtures were developed using slag and fly ash as the sole binder and sodium silicate as the alkaline activating solution.