Valorización de ceniza de bagazo de caña de la industria azucarera Nicaragüense como sustituto parcial al cemento Portland

In this study, the use of the ashes of sugarcane bagasse (ASB) from Monte Rosa sugarcane mill (Nicaragua) as an alternative material to Portland Cement (PC) was evaluated. The evaluation was performed through studies of advanced characterization and mechanical properties in pastes with 15% and 45% substitution of PC. Moreover, 100% PC pastes were used as reference. The mechanical resistance (MR), the consumption of calcium hydroxide and the development of reaction products were measured. The results showed that the highest values of MR were obtained for the reference pastes, thus indicating that the MR decreased with increase in the degree of substitution. Through the analysis of X-ray diffraction (XRD) and thermal analysis TGA / DTA was found that the consumption of Ca(OH)2 gave rise to the formation of CSH gel as the main product of hydration and caused the gain in the mechanical properties. The reaction products were observed by scanning electron microscopy (SEM) where the mechanism in solid state was noticeable. From this result, it can be concluded that the ASB are pozzolanic material with a better reactivity to Ca(OH)2 with 15% of substitution. DOI: http://dx.doi.org/10.5377/nexo.v27i2.1944En este estudio, se presenta la valoración del uso de las cenizas de bagazo de caña (CBCA) proveniente del Ingenio Monte Rosa(Nicaragua) como material alternativo al cemento Portland (CP) mediante estudios de caracterización avanzada y propiedadesmecánicas, en pastas endurecidas de CP sustituidas en 15 y 45 % por CBCA; además se utilizó pastas de referencia con 100 %CP sobre las cuales se evaluó las resistencias mecánicas (RM), el consumo de hidróxido de calcio y el desarrollo de losproductos de reacción. Los resultados revelaron que los valores más altos de RM reportados fueron por el sistema de referencia,indicando que la RM disminuyó con el incremento en el porcentaje de sustitución. Por medio de los análisis de difracción derayos X (DRX) y análisis térmicos por ATG/ATD fue demostrado el consumo de Ca(OH)2 que dio lugar a la formación de gelCSH como principal producto de hidratación y responsable de la ganancia de las propiedades mecánicas. Los productos dereacción fueron observados también por microscopia electrónica de barrido (MEB) donde el mecanismo en estado sólido fuenotable. A partir de estos resultados se puede concluir que las CBCA son un material puzolánico con una mejor reactividadfrente al Ca(OH)2 con 15 % de sustitución.DOI: http://dx.doi.org/10.5377/nexo.v27i2.194

The forward physics facility at the high-luminosity LHC

High energy collisions at the High-Luminosity Large Hadron Collider (LHC) produce a large number of particles along the beam collision axis, outside of the acceptance of existing LHC experiments. The proposed Forward Physics Facility (FPF), to be located several hundred meters from the ATLAS interaction point and shielded by concrete and rock, will host a suite of experiments to probe standard model (SM) processes and search for physics beyond the standard model (BSM). In this report, we review the status of the civil engineering plans and the experiments to explore the diverse physics signals that can be uniquely probed in the forward region. FPF experiments will be sensitive to a broad range of BSM physics through searches for new particle scattering or decay signatures and deviations from SM expectations in high statistics analyses with TeV neutrinos in this low-background environment. High statistics neutrino detection will also provide valuable data for fundamental topics in perturbative and non-perturbative QCD and in weak interactions. Experiments at the FPF will enable synergies between forward particle production at the LHC and astroparticle physics to be exploited. We report here on these physics topics, on infrastructure, detector, and simulation studies, and on future directions to realize the FPF's physics potential