The purpose of this research was to study 200 Glass Fibre Self Compacting Concrete (GFSCC) mixtures that consisted of various materials and proportions and then fitted into linear regression models at 28 and 90 days; either into the water/cement (w/c) materials ratio or the water/powder (w/p) ratio. From the study it was learned that the w/p ratio provides us with a stronger indicator of strength by observing the improvement in compressive strength values at 28 and 90 days. This may have been due to the delayed pozzolanic activity through the Fly ash, which is available in powder form . From this result we concluded that the water/powder ratio is a better indicator of strength. In addition to its highly pozzolanic nature, it was noted that Fly ash (available in powder form) assisted in the refinement of the pore structure of the concrete. This in turn also lead to a higher performance of the concrete. Water demand of self compacting concrete is high compared to the concrete of same strength of ordinary concrete. This was attributed to the higher fineness of fly ash. Thus, net water-powder ratio in turn affects its relation with compressive strength of concrete. This demands a retrospection of well-known Abram's Water-Cement ratio relationship. With this view as part of an ongoing research program, an investigation was taken up to study the relationship between water-powder ratio and compressive strength of glass fibre self compacting concrete using alkali-resistant glass fibres.