Shrinkage Control
Shrinkage Control - Related Videos
01:27
Shrinkage in Concrete
0 Views •
2024
Shrinkage in concrete is primarily due to water loss from evaporation, hydration of cement, or carbonation, leading to a reduction in volume. The volumetric contraction results in volumetric strain in concrete. However, in practice, shrinkage is measured as linear strain, which is one-third of the volumetric strain. When concrete is still in its plastic state, it can undergo a decrease in volume by about 1% of its absolute volume. This decrease is known as plastic shrinkage. It arises either...
01:21
Drying Shrinkage
0 Views •
2024
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...
01:24
Carbonation Shrinkage
0 Views •
2024
Atmospheric CO2 penetrates the concrete's pores and, in the presence of moisture, forms carbonic acid, which then reacts with calcium hydroxide in the hydrated cement, forming calcium carbonate. This process reduces the concrete's volume and is termed carbonation shrinkage. The concrete's permeability is slightly reduced as calcium carbonate produced during the reaction fills its pores. Furthermore, its strength is slightly enhanced as the water released during the reaction facilitates the...
08:45
Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation
0 Views •
Cited by 12 •
2014
In order to understand the spatial development of polymerization shrinkage stress in dental resin-composite restorations, Digital Image Correlation was used to provide full-field displacement/strain measurement of restored model glass cavities by correlating images of the restoration taken before and after polymerization.
01:25
Shrinkage, Obsolescence, and Holding Costs
0 Views •
2025
In inventory-based businesses, profitability often depends on more than just sales volume or procurement efficiency. Hidden costs tied to inventory management—specifically shrinkage, obsolescence, and holding costs—can significantly erode margins if left unmanaged.Shrinkage occurs when inventory is lost due to theft, damage, or administrative errors. Even with advanced tracking systems, discrepancies remain a persistent issue, especially in retail. Regular audits, employee training, and...
FAQs
It begins by linking dimensional change to its cause, such as drying, cooling, curing, or chemical transformation. Engineers then adjust composition and processing conditions so volume changes occur more uniformly and generate less restraint. Curing, moisture or temperature management, and structural detailing further limit stress concentration, reducing the likelihood of cracking, distortion, or loss of dimensional stability.
Moisture and temperature conditions influence how quickly materials lose volume or respond during drying, cooling, and curing. Rapid or uneven changes can increase internal stress, while controlled conditions help movement occur more gradually. Managing these variables is therefore important for preserving surface integrity and dimensional accuracy in concrete, polymers, coatings, ceramics, and manufactured components.
Restraint prevents a material from moving freely as its volume changes. When the material cannot accommodate that movement, internal stresses can accumulate and produce cracking or distortion. Shrinkage control addresses this interaction through curing practices and structural detailing that accommodate unavoidable movement, allowing engineers to reduce damage even when dimensional reduction cannot be eliminated completely.
Engineers first identify whether drying, cooling, curing, or chemical change drives the movement. They then evaluate material composition, moisture and temperature conditions, curing requirements, restraint, and structural detailing. The selected controls should limit stress while accommodating unavoidable movement. Reviewing dimensional stability, surface integrity, and expected service conditions helps determine whether the strategy is effective.
The approach applies across construction and materials engineering, including concrete, polymers, coatings, ceramics, and manufactured components. Its relevance depends on whether drying, cooling, curing, or chemical changes may alter dimensions or create defects. Engineers use the principles when selecting materials and processing conditions for applications that require stable geometry, intact surfaces, and dependable service performance.
An effective approach improves dimensional stability, preserves surface integrity, and limits cracking or distortion. These outcomes indicate that material movement and the resulting internal stresses are being managed appropriately for the application. Better control can also support longer service life, reduce maintenance and repair needs, and improve confidence in the reliability of the finished component or structure.