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Related Concept Videos

Porosity in Cement Paste01:18

Porosity in Cement Paste

283
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...
283
Fiber Reinforced Concrete01:22

Fiber Reinforced Concrete

173
Fiber-reinforced concrete significantly enhances the structural and nonstructural properties of traditional concrete by incorporating fibers like steel, glass, and polymers. These fibers, varying from natural ones such as sisal and cellulose to manufactured ones like polypropylene and Kevlar, are mixed into hydraulic cement with aggregates. Steel fibers, often preferred for their robustness, contribute to improved ductility, toughness, and post-cracking performance. The concrete is classified...
173
Strength of Cement01:20

Strength of Cement

260
Strength tests for cement are not performed directly on neat cement paste due to difficulty in obtaining consistent, reliable specimens. Instead, cement is typically tested in the form of cement-sand mortar.
For compressive strength tests, ASTM C 109-05 standards prescribe a cement-sand mix ratio of 1:2.75 and a water/cement ratio of 0.485 for making 2-inch cubes. These cubes are mixed, cast, and cured in saturated lime water at 23°C until testing. Flexural strength testing, outlined in...
260
Fineness of Cement01:15

Fineness of Cement

289
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...
289
Soundness of Cement01:17

Soundness of Cement

299
The soundness of cement refers to the ability of cement paste to retain its volume after setting. Unsound cement can lead to expansion and structural damage due to the presence of free lime, magnesia, and calcium sulfate. Free lime hydrates very slowly, expanding and causing unsoundness, which is difficult to detect because it intercrystallizes with other compounds. Magnesia also reacts with water, forming crystals that can disrupt the cement's structure. Calcium sulfate can create...
299
Pore Size Distribution01:23

Pore Size Distribution

246
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...
246

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Related Experiment Video

Updated: Oct 27, 2025

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
11:07

Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior

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Fibre post cementation: instrumental analysis.

R J Manenti1, A P Lomurno1, S Giancaspro1

  • 1Department of Life, Health and Environmental Sciences, University of L'Aquila, L'Aquila, Italy.

Journal of Biological Regulators and Homeostatic Agents
|July 22, 2021
PubMed
Summary
This summary is machine-generated.

Mineral fiber posts and epoxy resins create a strong "monobloc" for restoring endodontically treated teeth. This study analyzes the surface characteristics of these posts, focusing on their integration with cement and dental materials for improved tooth reconstruction.

Keywords:
endocanal postpost-cement-toothprosthetics

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Area of Science:

  • Dentistry
  • Biomaterials Science
  • Restorative Dentistry

Background:

  • Endodontically treated teeth often suffer structural weakening due to significant dental substance loss.
  • Coronal reconstruction necessitates the use of endocanal posts to reinforce these weakened teeth.
  • Modern materials like mineral fiber posts and epoxy resins offer improved integration and biomechanical properties.

Purpose of the Study:

  • To analyze and compare the surface characteristics of currently available mineral fiber posts.
  • To evaluate the interaction between these posts, resinous cements, and dental materials.
  • To assess the potential for creating a homogeneous "post-dentine-cement monobloc" for optimal tooth restoration.

Main Methods:

  • Experimental study design.
  • Surface characterization of mineral fiber posts.
  • Microscopic observation of post-cement-dentin interfaces.

Main Results:

  • Mineral fiber posts and epoxy resins demonstrate excellent integration with resinous cements.
  • The combination of these materials facilitates the formation of a "post-dentine-cement monobloc".
  • Surface analysis revealed favorable interactions crucial for morphofunctional tooth resetting.

Conclusions:

  • Mineral fiber posts and epoxy resins represent an advanced approach to restoring endodontically treated teeth.
  • The "monobloc" concept achieved with these materials enhances structural integrity and function.
  • Further surface characteristic analysis confirms their suitability for durable and aesthetic dental reconstructions.