This paper evaluates the impact of the air-entrainment path on the properties of cementitious material. In order to do this, the granulometric distribution of a micro-concrete was maintained constant and the air was incorporated via two processing paths: injection of aqueous foam or addition of air-entraining agent in the formulation. The hardened properties were evaluated after 28 days and the results show that the injection of aqueous foam can provide a higher level of air-entrainment in the fresh state using lower admixture content. In the hardened state no significant variations in the total porosity or in the mechanical strength of the micro-concretes were observed. However, air permeability, which is closely linked to durability, was higher in the micro-concrete obtained through the injection of aqueous foam due to microstructural alterations.
Air-incorporation-air-entrainment; Mechanical properties; Air-permeability
