Análisis de optimización de la relación costo/resistencia para hormigones estructurales con el uso de aditivos, y cálculo de su sostenibilidad mediante herramientas de análisis de ciclo de vida

Abstract

The following study seeks to determine the optimal values for the implementation of water-reducing additives for structural concrete mixtures. A 250 kg/cm2 control mix was designed using the ACI 318 standard from 2008, along with proposed concrete mixtures using: medium range, high range additives and superplasticizers, these being: Plastocrete 161HE, Sikament HE200 and Viscocrete 4100 respectively, dosed with the average and maximum percentage according to technical specifications of each additive. The process consisted of making 20 x 10 cm cylindrical concrete specimens in batches of 12 specimens for each concrete with a different percentage of additive, and an extra 12 control mix concrete specimens (concrete without additive). The specimens were used to determine their resistance with indirect compression and traction tests at 8, 16, 28 days after their casting. The compression test was intended to verify that the resistance is not significantly altered by maintaining the water-cement ratio of all mixtures while saving on the amount of cement, and the indirect tensile test was intended to analyze the physicalmechanical properties with the use of additives. Sustainability and cost analysis were also carried out, finally a weighted multi-criteria process to determine the most optimal concrete was implemented in order to decide the best structural concrete mix with a comprehensive and robust analysis tool.