Heat of hydration plays a key role in mass concrete production. This study evaluates the role of Ground Granulated Blast Furnace Slag (GGBS) as supplementary binder in production of mass concrete. The main intention is to examine whether GGBS can maintain concrete temperature within acceptable limits for mass concrete applications, particularly for raft concrete pour thickness above 1.5 m. This article presents a case study of concrete raft constructed for a B7 + G + 33-storey building in Hyderabad, India. The fresh and hardened concrete with 40% cement and 60% GGBS (C4GG6) were tested to investigate their compressive strength, durability, thermal and environmental performance. The results showed that adding GGBS increased the final setting of concrete size but had no significant effect on workability. The heat of hydration of C4GG6 reached up to 63 °C, is lesser than maximum value of 70 °C specified by Indian Standards IS 14591 and IS 7861-1, showing its suitability for mass concrete applications. Rapid chloride penetration and water permeability index were within the IS limits. GGBS can be effectively used to control temperature and improve the environmental impact of large-scale construction.