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Videos de Conceptos Relacionados

Types of Cement II01:22

Types of Cement II

166
Portland blast-furnace cement is made by blending Portland cement clinker with granulated blast-furnace slag, which accounts for 25 to 65 percent of the cement's weight. Despite its similarities to ordinary Portland (Type I) cement in terms of fineness and setting times, its early strength is lower, though it achieves comparable strength later on. It's particularly suited for mass concrete structures and marine environments due to its lower heat of hydration and superior sulfate...
166
Fineness of Cement01:15

Fineness of Cement

215
The fineness of cement directly influences the rate of hydration, as the hydration begins at the surface of the cement particles. In addition to hydration, the fineness of cement is vital for various properties of concrete including workability, gypsum requirement, and long-term behavior. The fineness of cement is represented in terms of the specific surface of cement which is typically measured in square meters per kilogram, with several methods available for this determination.
Direct...
215
Superplasticizers01:30

Superplasticizers

116
Superplasticizers are advanced admixtures that enhance the workability of concrete by lowering the water content without compromising the strength of the material. These substances are highly effective water reducers, improving concrete flow, making it easier to work with, and enabling concrete to reach inaccessible areas or densely reinforced sections without mechanical vibration. The key components in superplasticizers are either sulfonated melamine or naphthalene formaldehyde condensates,...
116
Mass Concreting01:22

Mass Concreting

108
Mass concreting refers to the process of placing large volumes of concrete, such as in gravity dams. The heat generated during the cement hydration process and differential cooling rates within the concrete mass can lead to a temperature gradient, which can result in thermal cracks in the concrete mass.
To reduce the risk of such cracking, the concrete mix may incorporate low-heat cement and pozzolans to reduce the temperature rise. Pre-cooled angular aggregates and water-reducing admixtures...
108
Hydration of Cement01:24

Hydration of Cement

380
Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
380
Porosity in Cement Paste01:18

Porosity in Cement Paste

223
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
223

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Cemento superfrío escalable mejorado con meta-superficie

Guo Lu1, Fengyin Du1,2, Zhen Wang1

  • 1State Key Laboratory of Engineering Materials for Major Infrastructure, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China.

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Los investigadores han desarrollado un nuevo cemento de refrigeración para el enfriamiento sostenible de edificios. Este material duradero y de alto rendimiento ofrece una reducción significativa de la temperatura y una potencial huella de carbono neta negativa.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería civil
  • Tecnologías sostenibles

Sus antecedentes:

  • Los materiales de refrigeración radiativa pasiva durante el día (PDRC) ofrecen soluciones sostenibles de refrigeración de edificios.
  • Existen desafíos en el desarrollo de materiales estructurales PDRC duraderos y escalables para la ingeniería civil.

Objetivo del estudio:

  • Para sintetizar un cemento de refrigeración mejorado para metasuperficie para aplicaciones prácticas de ingeniería civil.
  • Abordar las limitaciones de los materiales PDRC actuales en términos de durabilidad, despliegue y escalabilidad.

Principales métodos:

  • Se empleó una estrategia de fabricación a presión escalable y universal durante un proceso de producción de cemento con bajas emisiones de carbono.
  • La mejora de la meta-superficie se logró a través del auto-ensamblaje de etringites reflectantes y poros jerárquicos.
  • Las propiedades del material se caracterizaron por la reflectancia solar, la emisividad en el infrarrojo medio, la resistencia y la resistencia a condiciones adversas.

Principales resultados:

  • El cemento con arquitectura fotónica logró una alta reflectancia solar (96,2%) y una emisividad en el infrarrojo medio (96,0%).
  • Se registró una caída de la temperatura de 5,4°C en condiciones de mediodía (850 W/m2 de intensidad solar).
  • El cemento demostró una alta resistencia intrínseca, resistencia a la abrasión y estabilidad óptica bajo varias exposiciones severas.

Conclusiones:

  • El cemento de refrigeración desarrollado es una solución prometedora, duradera y escalable para el enfriamiento sostenible de edificios.
  • El material presenta un excelente rendimiento y resistencia, adecuado para aplicaciones de ingeniería civil exigentes.
  • Una evaluación del ciclo de vida guiada por el aprendizaje automático sugiere un perfil de emisión de carbono neto negativo potencial para este material innovador.