TY - JOUR AU - Robayo-Salazar, R. AU - Mejía de Gutiérrez, R. AU - Puertas, F. PY - 2019/09/30 Y2 - 2024/03/28 TI - Alkali-activated binary concrete based on a natural pozzolan: physical, mechanical and microstructural characterization JF - Materiales de Construcción JA - Mater. constr. VL - 69 IS - 335 SE - Research Articles DO - 10.3989/mc.2019.06618 UR - https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2255 SP - e191 AB - This article presents the physical, mechanical and microstructural characterization of an alkali-activated binary concrete (AABC) based on a natural pozzolan (NP) of volcanic origin (70%) and granulated blast furnace slag (GBFS) (30%) cured at room temperature (25°C). A solution based on the combination of NaOH and waterglass (Na<sub>2</sub>SiO<sub>3</sub>·5H<sub>2</sub>O) was employed as an alkaline activator. The concrete design was obtained using a modified version of the “absolute volume” method (ACI 211.1). The performance of the AABC was similar and even superior to that of the reference concrete (OPC); e.g., it exhibited a compressive strength of up to 43.4 MPa at 360 days. These results demonstrate that the NP has potential for use in the industrial-scale production of these types of materials in the foreseeable future. ER -