Two-way ANOVA results also lead to the identification of the most influential factor on compressive strength response as being the ‘GFRP Waste Content’, followed to by the´GFRP Waste Type’with minor relevance. The respective percent contributions to global variation (P), computed as the ratio of the pure sum of squares of the factor to the total sum of squares, as expressed by Eq. (1), are respectively, 61% and 12%.