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Porosity in Cement Paste

Porosity in Cement Paste

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.
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Total Voids in Concrete

Total Voids in Concrete

Total voids in concrete encompass gel water volume, capillary pores, and entrapped air. Gel water (retained within the cement hydration products) and physically entrapped or adsorbed water are significant for the hydration process. For complete hydration, it's estimated that the space needed for the products of a cubic centimeter of cement doubles. Capillary pores constitute the unoccupied space within the hydrated cement paste, with their size largely influenced by the water-to-cement ratio...

Fineness of Cement

Fineness of Cement

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...

Hydration of Cement

Hydration of Cement

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...

Pore Size Distribution

Pore Size Distribution

In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
Adequate...

Permeability of Concrete

Permeability of Concrete

Permeability in the context of concrete refers to how easily liquids or gases can pass through the material. This quality is crucial for assessing the water-tightness and durability of concrete structures and their resistance to chemical attacks. Concrete permeability can be determined through comparative laboratory tests. These tests typically involve sealing a concrete specimen from the sides, applying water pressure to the top surface with pressure, and measuring the amount of water passing...

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Related Experiment Video

Updated: Jul 12, 2026

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

Determination of Aggregate Surface Morphology at the Interfacial Transition Zone (ITZ)

Published on: December 16, 2019

Vacuum-mixing cement does not decrease overall porosity in cemented femoral stems: an in vitro laboratory

K J Messick¹, M A Miller, L A Damron

¹SUNY Upstate Medical University, Syracuse, NY 13210, USA.

The Journal of Bone and Joint Surgery. British Volume

|September 6, 2007

Summary

Vacuum mixing did not reduce overall porosity in cemented total hip replacements. However, hand-mixed cement showed higher pore density and a stronger cement-stem interface.

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Area of Science:

Orthopedic Surgery
Biomaterials Science
Medical Device Engineering

Background:

The clinical impact of vacuum mixing on cement porosity in total hip replacements is unclear.
Understanding cement properties is crucial for implant longevity and patient outcomes.

Purpose of the Study:

To compare porosity and interface strength between hand-mixed and vacuum-mixed cement in a simulated total hip replacement scenario.
To evaluate the effect of mixing technique on cement mantle characteristics.

Main Methods:

Paired femoral constructs were prepared using hand-mixed and vacuum-mixed bone cement.
Porosity distribution and cement-stem/cement-bone interface strength were assessed after curing.
A cadaver model simulated intra-operative cementing conditions.

Main Results:

Overall porosity fraction was similar between hand-mixed (6%) and vacuum-mixed (5.7%) cement.
Vacuum mixing did not significantly alter linear pore fractions at interfaces.
Hand-mixed cement exhibited a higher pore number-density (p=0.0013) and stronger cement-stem interface (p=0.0005).
Cement-bone interface strength was unaffected by mixing technique (p=0.275).

Conclusions:

Vacuum mixing does not inherently reduce overall porosity in cemented femoral components.
Mixing technique influences pore distribution and cement-stem interface strength, not necessarily cement-bone interface strength.
Further research is needed to clarify the clinical implications of these findings for total hip replacement performance.