Ingeniería Civil y Mecánica
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Item Análisis de la resistencia a compresión del hormigón simple con agregado grueso reciclado y craqueo catalítico fluidizado en reemplazo del agregado fino(Ingeniería Civil y Mecánica. Carrera Ingeniería Civil, 2025) Espinoza Castro María José; Navarro Peñaherrera Carlos PatricioThis experimental study evaluates the compressive strength of plain concrete by incorporating recycled coarse aggregate (RCA) and spent fluid catalytic cracking (FCC) catalyst as a replacement for fine aggregate. This research responds to the growing need to promote sustainable practices in construction, optimize resources, and reduce the environmental impact generated by the extensive use of natural materials. The methodology was developed in three phases: characterization of the physical and mechanical properties of recycled aggregates, comparison of the compressive strength of traditional concrete versus concrete with RCA and FCC, and an analysis of economic feasibility. Concrete mixtures with 100% recycled materials and 100% natural aggregates were prepared following regulatory techniques such as NTE INEN and ASTM and were evaluated using standardized tests. The results show that the use of RCA and FCC affects the workability and strength of concrete, but within acceptable ranges for certain structural uses. After 7 days, the concrete with natural aggregates reached a strength of 171.45 kg/cm², while the mix with recycled aggregates reached 37.75 kg/cm². After 14 days, the strengths were 196.55 kg/cm² and 47.47 kg/cm², respectively, and after 28 days, values of 239.74 kg/cm² were obtained for natural aggregates and 74.17 kg/cm² for recycled aggregates. These figures show that, although there is an approximately 70% decrease in the strength of recycled concrete compared to conventional concrete, it can meet structural parameters for certain non-critical applications. Furthermore, the use of recycled materials is considered not to significantly reduce the cost of concrete: the cost per cubic meter increased from $100.90 (traditional mix) to $291.77 (mix with recycled materials), which represents a significant contribution in economic terms. The study's conclusions indicate that incorporating AGR and FCC is not feasible from a technical or economic perspective, even if the proportions in the mix are optimized or the project's structural requirements are considered. However, for other uses, this approach contributes to reducing environmental impact, fosters the circular economy, and promotes responsible resource use in the construction sector