The physico-chemical evaluation of alkali-activated materials under aggressive conditions is a critical factor in determining their suitability and applications in construction. This paper presents the investigation on the performance of alkali excited blend of fly ash (FA) and ground granulated blast furnace slag (GGBS) concrete after exposure to aggressive chemicals such as sulphuric acid, sodium sulphate and carbon dioxide atmosphere. The main investigating factor is the weight percentage of GGBS in FA, and the concrete specimen casts in ambient temperature are GPC1 (FA 80%: GGBS 20%), GPC2 (FA70%: GGBS 30%) and GPC3 (FA 60%: GGBS 40%). The durability performance was verified under 5% concentrated sulphuric acid, 5% sodium sulphate solution and controlled carbon dioxide environment (3% CO2, 65% relative humidity (RH), and temperature of 25 ºC) as well as duration of exposure independently. The compressive strength, mass loss and physical changes were monitored before and after exposure. The result shows that increasing content of GGBS improved the strength in the as cured samples and attained the grade of M40. The strength retention is slightly decreased after exposing to aggressive acid, whereas retention of the strength after sulphate immersion at longer duration of 120 days. The carbonation depth of GPC specimens varied from 2 to 8 mm that are within the limits. The mineral phases were identified from powder X-ray diffraction and chemical structural changes from the IR frequency number of Si-O-Si and Si-O-Al bond in geopolymers. A high and prolonged strength capacity was accomplished proving that blended geopolymeric concrete has the potential to be applied as an alternate building material to traditional Portland cement concrete.