Solís-Carcaño, R., Moreno, E.I. y Arcudia-Abad, C. 1. Study of the Concrete”™s Compressive Strength Due to the Combined Effect oWater-cement ratio, the Coarse-fine Aggregate Ratio and the Source of the Aggregatesf the. Revista Técnica de la Facultad de Ingeniería. Universidad del Zulia. 31, 3 (1).