Cementitious Composites with Low Water Permeability through Internal Hydrophobicity
Three different hydrophobic agents were considered for internal hydrophobation of cementitious composites. The dosage varied between one and two percent of cement weight and these admixtures were introduced to the composite during the mix procedure. capillary suction test, pore protection factor (PF) test and compressive strength test where conducted for material characterization. The results show reduction in water permeability of modified samples and rapeseed oil was the most effective admixture between these agents. While water resistance in the PF test of the modifies samples were increased between 21% to 33%, the compressive strength was reduced between 10% to 18%. In cases where reducing water permeability is a major challenge in cementitious composites, using rapeseed oil for internal hydrophobation can be an environmentally friendly solution.
M. H. Baghban et al., "Cementitious Composites with Low Water Permeability through Internal Hydrophobicity", Key Engineering Materials, Vol. 779, pp. 37-42, 2018