notches that cause the cutting of filaments. A mass attack begins when the hydroxylation and dissolution of glass occur, and leave voids surrounding the by-products of the reaction between cement and glass. Using scanning electron microscopy, [PERSON] et al. [4] demonstrated the appearance of small structural defects in fiber which, with their growth, degrade fiber and decrease its resistance. [PERSON] et al. [5] identified the existence of two degradation fronts in GRC composite properties: the first is related to the type of fiber used and the chemical attack that it must withstand as a consequence of the pH exceeding 13 and the subsequent silica network hydroxylation; the second is related to the fiber physically interacting with the cementing matrix due to the growth of crystalline or amorphous hydration products on the fiber surface and between its filaments. In composites with AR fibers, localized corrosion is seen in the form of pits that deepen due to the nucleation of the portlandite around them. Similarly, it has been observed that AR fiber is attacked by the products generated during cement hydration, and calcium hydroxide crystals are embedded in the fiber and alter its physical properties [6; 7]. Furthermore, a chemical reaction is generated at the interface between the fiber and the cementitious matrix, which leads to mass loss in the fiber (hydroxylation). Both factors are largely responsible for the loss of GRC composite properties, such as reduced toughness and flexural strength. Chemical attack [7] on the surface of filaments is the first to affect the fiber because it alters the polymers of sizing, leading to fiber body corrosion. Alkaline attack leads to silicon dioxide extraction and zirconium dioxide hydration, which can form a protective layer for a subsequent attack when combined with alkali and alkaline earth ions. With the inclusion of pozzolanic materials, the pH can be lowered and minor losses in the thickness of sizing occur over time [5]. Pozzolans are used to replace one part of Portland cement in the mortar formulation so that they can react with the calcium hydroxide produced by cement hydration. In this way, the nature and microstructure of the cement matrix are modified, and a larger quantity of hydrated products, such as calcium silicate, aluminate, and silicauluminate hydrates, develop. Hence, the mechanical properties improve and GRC durability generally increases [4]. By partially replacing Portland cement with pozzolanic materials, e.g., fly ash and silica fume, improved mechanical GRC behavior is achieved for materials with a big specific surface area, even when they are subjected to controlled aging processes [8; 9]. The cementitious matrix is modified by reducing the calcium hydroxide that is present because the reaction of pozzolans with the portlandite released during cement hydration generates hydration products that do not affect fiber integrity. This represents an increase in both mechanical properties and durability by composite aging. On the one hand, fly ashes are characterized by medium-rate pozzolanic reactivity, and the most important changes in the microstructure and phases in Portland cement replaced with the fly ash system are observed at mid- and long-term ages (more than 60 curing days). Fly ash reactivity can increase by grinding particles [10; 11]. In this case, the role of the pozzolanic effect is enhanced and its contribution is observed at earlier curing ages. On the other hand, silica fume offers higher reactivity and its effect on Portland cement systems is observed within the first 28 curing days [12]. Commercial densified silica fume (DSF) is an agglomerated material with micrometric and submicrometric particles. To increase its reactivity, it can be disaggregated by an effective process known as sonication, which consists of applying an ultrasound with a probe to an aqueous medium containing DSF particles.