The application on non-cementious concrete are widely discovered for industry as to enhance the use of waste material, fly ash. Fly ash known as geopolymer binder which can improve the mechanical performance of the concrete and reinforcement impart strength to the concrete, relatively. Reinforcement correlate improvement in the blast resistance when retrofitted with the steel bar and fibres. The levels of damage after the blast explosion rely on the types of reinforcement in the concrete matrix. Meanwhile, the mass of explosive and distance of explosive to the concrete beam used in experiment field also affect the level of damage after blasting. The 3 beams was tested in the field blast experiment by using different scaled distance that are 0.298 m/kg1/3 , 0.224 m/kg1/3 and 0.149 m/kg1/3. Impulsive impact from the explosive detonation with the lowest scaled distance bring the most effect against the concrete. This paper represent the geopolymer concrete beam with steel bar reinforcement response towards explosive air blast loading.