Characterization of a fiber-reinforced geopolymeric concrete for its application in construction elements

This article presents an analysis of the physical-mechanical characterization of a fiber-reinforced geopolymeric concrete, whose HCV matrix is made up of 90% fly ash (CV) and 10% ordinary portland cement (OPC), using as an alkaline activator a solution composed of silicate and sodium hydroxide (NaOH, Na2SiO3) and water. The reinforcement used was SikaFiber Xorex steel fibers incorporated into the matrix in proportions of 50 and 75 kg/m3. The HCV-50 mix reported a compressive strength of 26.77 MPa at 28 days of curing, classifying it as structural concrete according to NSR-10. At the same curing age, indirect tensile strength of 3.49 MPa, modulus of elasticity of 29.32 GPa, flexural strength of 5.15 MPa and toughness up to cracking deflection (0f) of 1971,9 N.mm were obtained. ISSN impreso: 1657 -4583. ISSN en linea: 2145 - 8456. This mixture, considered optimal, was used in the manufacture of concrete slabs, which presented a rupture deflection delta f of 4.45 mm, ultimate deflection of 16.15 mm, maximum load supported 15.6 kN, tenacity of 49464, 8 N.mm up to delta f and 145847.3 N.mm up to 3 times delta f. The fiber-reinforced geopolymeric material is also proposed to be used in the production of shotcrete (Shotcrete), and in the construction of lightweight tiles.