The utilization of alkali-activated binders has emerged as a promising avenue for sustainable construction practices, offering an environmentally friendly alternative to conventional cement-based systems. This study investigates the use of two major agro-wastes, namely rice husk ash (i.e., RHA) and sugarcane bagasse ash (i.e., SBA), as ingredients in producing slag-based alkali-activated concrete, with an emphasis on workability and mechanical performances. The study extends its scope to encompass a comprehensive mix designed to meet the requirements of Pavement Quality Concrete. The investigation involves the systematic replacement of the total binder, ground granulated blast furnace slag (i.e., GGBS), with varying dosages of SBA and RHA, ranging from 0 to 20% at increments of 5%. The findings reveal that the incorporation of SBA up to 10% and RHA up to 15% satisfies not only the mechanical design specifications for Pavement Quality Concrete but also demonstrates the efficacy of agro-industrial waste utilization. This research significantly contributes to sustainable construction practices by effectively reusing agro-industrial waste products through alkali activation, through which it supports the global initiatives to reduce environmental impact and promote eco-friendly construction methods. This study advocates for a paradigm shift toward sustainable and environmentally responsible pavement construction possibilities, fostering a greener and more resilient future for the concrete pavement construction through the integration of agro-industrial wastes in successfully producing superior pavement quality sustainable concretes.