INFLUENCIA DEL MUCÍLAGO DE NOPAL Y EXTRACTO DE ALGAS CAFÉS EN EL GRADO DE HIDRATACIÓN DE PASTAS DE CEMENTO PORTLAND ORDINARIO

This paper presents the effect produced by the addition of aqueous dispersions of cactus mucilage and brown seaweed extract on the degree of hydration of ordinary Portland cement pastes. Cement pastes with water/cement ratios of 0.30 and 0.60 were prepared containing the natural additives at three concentrations. The curing conditions were moist cured and sealed. The degree of hydration was determined by ignition and thermo-gravimetric analysis at 14, 28 and 56 days of age. The results indicate a higher degree of hydration in pastes with a water/cement ratio of 0.60 containing the natural additives with respect to control specimens. This effect could be explained by a better dispersion of cement particles in the presence of the natural additives and their capacity to retain water, thereby providing internal curing.Este trabajo presenta el efecto que produce la adición de dispersión acuosa de mucílago de nopal y el extracto de algas marinas cafés en el grado de hidratación de pastas de cemento Portland ordinario. Se elaboraron pastas de cemento con relaciones agua/cemento de 0.30 y 0.60, conteniendo los aditivos naturales en tres concentraciones. Las pastas se curaron en húmedo y selladas. Se determinó el grado de hidratación de las pastas ignición y análisis termo-gravimétrico a los 14, 28 y 56 días de edad. Los resultados indican un mayor grado de hidratación en las pastas de cemento con relación agua/cemento de 0.60 conteniendo los aditivos naturales en comparación con el control. Se sugiere que esto es debido a una mejor dispersión de las partículas de cemento en la presencia de estos aditivos y a la capacidad de estos para retener agua, con lo cual se produce curado interno

INFLUENCIA DEL MUCÍLAGO DE NOPAL Y EXTRACTO DE ALGAS CAFÉS EN EL GRADO DE HIDRATACIÓN DE PASTAS DE CEMENTO PORTLAND ORDINARIO

This paper presents the effect produced by the addition of aqueous dispersions of cactus mucilage and brown seaweed extract on the degree of hydration of ordinary Portland cement pastes. Cement pastes with water/cement ratios of 0.30 and 0.60 were prepared containing the natural additives at three concentrations. The curing conditions were moist cured and sealed. The degree of hydration was determined by ignition and thermo-gravimetric analysis at 14, 28 and 56 days of age. The results indicate a higher degree of hydration in pastes with a water/cement ratio of 0.60 containing the natural additives with respect to control specimens. This effect could be explained by a better dispersion of cement particles in the presence of the natural additives and their capacity to retain water, thereby providing internal curing.Este trabajo presenta el efecto que produce la adición de dispersión acuosa de mucílago de nopal y el extracto de algas marinas cafés en el grado de hidratación de pastas de cemento Portland ordinario. Se elaboraron pastas de cemento con relaciones agua/cemento de 0.30 y 0.60, conteniendo los aditivos naturales en tres concentraciones. Las pastas se curaron en húmedo y selladas. Se determinó el grado de hidratación de las pastas ignición y análisis termo-gravimétrico a los 14, 28 y 56 días de edad. Los resultados indican un mayor grado de hidratación en las pastas de cemento con relación agua/cemento de 0.60 conteniendo los aditivos naturales en comparación con el control. Se sugiere que esto es debido a una mejor dispersión de las partículas de cemento en la presencia de estos aditivos y a la capacidad de estos para retener agua, con lo cual se produce curado interno

Team dynamics in emergency surgery teams: results from a first international survey

Background: Emergency surgery represents a unique context. Trauma teams are often multidisciplinary and need to operate under extreme stress and time constraints, sometimes with no awareness of the trauma\u2019s causes or the patient\u2019s personal and clinical information. In this perspective, the dynamics of how trauma teams function is fundamental to ensuring the best performance and outcomes. Methods: An online survey was conducted among the World Society of Emergency Surgery members in early 2021. 402 fully filled questionnaires on the topics of knowledge translation dynamics and tools, non-technical skills, and difficulties in teamwork were collected. Data were analyzed using the software R, and reported following the Checklist for Reporting Results of Internet E-Surveys (CHERRIES). Results: Findings highlight how several surgeons are still unsure about the meaning and potential of knowledge translation and its mechanisms. Tools like training, clinical guidelines, and non-technical skills are recognized and used in clinical practice. Others, like patients\u2019 and stakeholders\u2019 engagement, are hardly implemented, despite their increasing importance in the modern healthcare scenario. Several difficulties in working as a team are described, including the lack of time, communication, training, trust, and ego. Discussion: Scientific societies should take the lead in offering training and support about the abovementioned topics. Dedicated educational initiatives, practical cases and experiences, workshops and symposia may allow mitigating the difficulties highlighted by the survey\u2019s participants, boosting the performance of emergency teams. Additional investigation of the survey results and its characteristics may lead to more further specific suggestions and potential solutions