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Videos de Conceptos Relacionados

Testing Water Quality01:14

Testing Water Quality

When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
Water Cement Ratio01:28

Water Cement Ratio

The water-cement ratio is pivotal in defining concrete's quality. This ratio, a balance between the weight of water and cement in the mix, shapes the concrete's strength, durability, and resistance to environmental factors. As identified by Abrams’ law, less water in the mix equates to stronger concrete. However, water is essential not only for the chemical process of hydration but also for the concrete's workability and compaction. While hydration chemically binds water and cement, physical...
Preplaced Aggregate Concrete01:29

Preplaced Aggregate Concrete

Preplaced aggregate concrete is ideal for construction environments that are not easily accessible. The process begins by properly wetting the gap-graded coarse aggregates to remove the dirt, then placing it in the form and compacting it. Voids are filled with a mortar mix pumped under pressure through slotted pipes. This mortar typically consists of Portland cement, pozzolan, fine aggregates, water, and a fluidizing aid. The pozzolan helps reduce bleeding and segregation while improving the...
Superplasticizers01:30

Superplasticizers

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,...
Waterproofing and Anti-Bacterial Admixtures in Concrete01:22

Waterproofing and Anti-Bacterial Admixtures in Concrete

Concrete's susceptibility to water absorption is due to the capillary action within the pores of its hydrated cement paste. This action draws water in, creating the need for waterproofing admixtures to prevent such penetration. The efficacy of these admixtures is contingent upon the water pressure, with variations arising from different conditions such as rain, capillary rise, or hydrostatic pressure in structures intended to hold water.
Waterproofing admixtures render concrete hydrophobic,...
Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
To address...

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Detecting the Water-soluble Chloride Distribution of Cement Paste in a High-precision Way
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Materiales de ingeniería biomiméticos estables superhidrofóbicos y biomiméticos.

Zhiguang Guo1, Feng Zhou, Jingcheng Hao

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China.

Journal of the American Chemical Society
|November 10, 2005
PubMed
Resumen

Los investigadores desarrollaron un método rentable para crear superficies superhidrofóbicas en el aluminio y sus aleaciones. Estos materiales avanzados exhiben una excelente repelencia al agua, allanando el camino para nuevas aplicaciones.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química de las superficies.
  • Nanotecnología La nanotecnología es la nanotecnología.

Sus antecedentes:

  • El aluminio y sus aleaciones son ampliamente utilizados, pero pueden sufrir de malas propiedades de la superficie.
  • El desarrollo de superficies súper hidrofóbicas es crucial para las aplicaciones de materiales avanzados.
  • Los métodos existentes para crear superficies superhidrofóbicas pueden ser complejos o costosos.

Objetivo del estudio:

  • Desarrollar un método sencillo y económico para producir superficies superhidrofóbicas en aluminio y sus aleaciones.
  • Para caracterizar las propiedades superhidrofóbicas de las superficies tratadas.
  • Explorar las aplicaciones potenciales de estas nuevas superficies.

Principales métodos:

  • Oxidación superficial del aluminio y su aleación.
  • Modificación química de las superficies oxidadas.
  • Mediciones del ángulo de contacto para cuantificar la hidrofobia.

Principales resultados:

  • Superficies superhidrofóbicas alcanzadas en aluminio y aleación de Al con altos ángulos de contacto (168° y 161°, respectivamente).
  • La superhidrofobidad es el resultado de estructuras binarias a escalas micro y nanométricas.
  • Las superficies tratadas demostraron un rendimiento estable en un amplio rango de pH (1-14).

Conclusiones:

  • Se demostró con éxito un método simple y económico para crear superficies de aluminio superhidrofóbicas.
  • Las estructuras superficiales únicas contribuyen a la mayor repelencia al agua.
  • Estas superficies de aluminio súper hidrofóbicas muestran un potencial significativo para su uso como materiales lubricantes avanzados.