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Related Concept Videos

Drying Shrinkage01:21

Drying Shrinkage

When hardened concrete is exposed to air with a relative humidity of less than 100 percent, it begins to lose the free water within its capillaries. As this water evaporates, the water initially adsorbed onto the calcium silicate hydrates migrates towards these now empty spaces and eventually evaporates as well. Over time, as more water leaves, the volume of the concrete decreases, a phenomenon known as drying shrinkage.
A portion of this drying shrinkage can be reversed; if the concrete is...
Curing Methods01:26

Curing Methods

Concrete members with a small surface-to-volume ratio are cured by oiling and moistening the forms before casting the concrete member. These forms can be left in place for a prolonged period to prevent moisture loss, and can be wetted if made of a material suitable for wetting. If the forms are removed early, the concrete member is moistened and covered with polythene sheets to maintain moisture. For large horizontal concrete surfaces exposed to dry weather, a temporary covering is suspended...
Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
Plastic...
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
Curing of Concrete01:20

Curing of Concrete

The hydration of cement takes place within the water-filled capillary pores. However, environmental elements can disrupt this process by evaporating water from the concrete surfaces. Sealed concrete with a water-cement ratio below 0.5 experiences self-desiccation, leading to water loss. The water loss in concrete is mitigated by curing. This technique involves keeping the concrete saturated to maintain the necessary temperature and moisture conditions, to optimally fill the spaces in the cement...
Hot Weather Concreting01:20

Hot Weather Concreting

Concreting at elevated temperatures accelerates the hydration process, leading to quicker setting but potentially reducing the long-term strength of the concrete structure. Additionally, low air humidity fosters rapid moisture loss from the concrete, resulting in reduced workability, pronounced plastic shrinkage, and a higher likelihood of crazing.
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...

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Measuring and Modeling Contractile Drying in Human Stratum Corneum
08:00

Measuring and Modeling Contractile Drying in Human Stratum Corneum

Published on: March 1, 2017

Eliminating cracking during drying.

Qiu Jin1, Peng Tan, Andrew B Schofield

  • 1Department of Physics, The Chinese University of Hong Kong, Hong Kong, China.

The European Physical Journal. E, Soft Matter
|March 22, 2013
PubMed
Summary
This summary is machine-generated.

Adding emulsion droplets to colloidal suspensions prevents cracking during drying. This method effectively eliminates cracks and controls drying rates, offering industrial applications in paints and ceramics.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Chemical Engineering

Background:

  • Colloidal suspensions are prone to cracking during drying due to stress buildup.
  • This cracking phenomenon negatively impacts industries like paint and ceramics.
  • Existing methods for crack prevention are often insufficient or alter final product composition.

Purpose of the Study:

  • To develop an effective method for eliminating cracking in drying colloidal suspensions.
  • To investigate the role of emulsion droplets in mitigating drying-induced stresses.
  • To explore the impact of this technique on drying rates and final product properties.

Main Methods:

  • Incorporating emulsion droplets into colloidal suspension formulations.
  • Systematically varying emulsion droplet concentration.
  • Monitoring crack formation and drying kinetics during the evaporation process.

Main Results:

  • A critical concentration of emulsion droplets was identified, above which cracking was completely eliminated.
  • The addition of emulsion droplets significantly reduced the extent of cracking.
  • Drying rates were effectively modulated by the presence and concentration of emulsion droplets.

Conclusions:

  • Adding emulsion droplets is a viable strategy to prevent cracking in drying colloidal suspensions.
  • This technique offers precise control over both cracking and drying rates.
  • The method has potential for widespread industrial application in processes involving colloidal drying.