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Related Concept Videos

Strength of Cement01:20

Strength of Cement

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 ASTM C...
Porosity in Cement Paste01:18

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.
The balance of water to cement in the mix is critical—it...
Bonding and Strength of Aggregate01:12

Bonding and Strength of Aggregate

The bond between aggregate particles and the cement matrix is significantly influenced by the shape and surface texture of the aggregates. High-strength concretes benefit from a rougher texture, which leads to stronger bonding due to greater adhesion. Angular aggregates with larger surface areas also enhance this bond. The bonding quality, however, is complex to assess as no universally accepted test exists. Good bonding is indicated when a crushed concrete specimen shows some aggregate...
Soundness of Cement01:17

Soundness of Cement

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 ettringite,...
Fineness of Cement01:15

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...
Impact Strength of Concrete01:21

Impact Strength of Concrete

Impact strength in concrete is a critical measure that reflects the material's capability to endure the forces applied during pile driving and when supporting machinery foundations that experience impulsive loads. It is also essential when handling precast concrete components to prevent accidental damage. The impact strength is assessed by observing the concrete's resistance to repeated impacts and energy absorption capacity. A key indicator of significant damage to concrete is when it does not...

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Related Experiment Video

Updated: Jun 22, 2026

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
11:51

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Cement oscillation increases interlock strength at the cement-bone interface, with commentary.

Yi Wang1, Pengfei Han, Wenguang Gu

  • 1Department of Orthopedics, First Clinical College of Harbin Medical University, Harbin, China.

Orthopedics
|May 29, 2009
PubMed
Summary
This summary is machine-generated.

Oscillating bone cement significantly enhances interlock strength at the cement-bone interface. This vibrational mechanics approach improves cement filling, offering a promising technique to prevent aseptic loosening in cemented prostheses.

Related Experiment Videos

Last Updated: Jun 22, 2026

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
11:51

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

  • Biomedical Engineering
  • Orthopedic Surgery
  • Materials Science

Background:

  • Current bone cement fixation methods struggle to achieve durable cement-bone interfaces.
  • Inadequate interlock strength at the cement-bone interface is a primary cause of prosthetic loosening.
  • Improving cement penetration and interlock is crucial for long-term implant success.

Purpose of the Study:

  • To investigate the effect of bone cement oscillation on interlock strength at the cement-bone interface.
  • To develop a novel technique using vibrational mechanics to enhance cement fixation.
  • To evaluate the impact of oscillation on cement filling quality.

Main Methods:

  • A cement oscillator was designed based on vibrational mechanics principles.
  • 156 adult pig femurs were randomly assigned to oscillated and control groups.
  • Mechanical testing and stereomicroscopic analysis were used to assess interlock strength and cement filling.

Main Results:

  • The oscillated group demonstrated significantly greater interlock strength compared to the control group (P<.05).
  • Improved bone cement filling effect was observed in the oscillated group (P<.05).
  • Oscillation effectively enhanced the quality of the cement-bone interface.

Conclusions:

  • Bone cement oscillation is a viable technique to significantly increase interlock strength.
  • This method offers a high-performance and pragmatic approach for prosthesis fixation.
  • Oscillation holds considerable practical importance in preventing aseptic loosening of cemented prostheses.