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Soundness of Cement

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,...

Strength of Cement

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...

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Related Experiment Video

Updated: May 24, 2026

Accessing the Cytotoxicity and Cell Response to Biomaterials

Accessing the Cytotoxicity and Cell Response to Biomaterials

Published on: July 8, 2021

[Genotoxicity study of bone cement].

Yanping Hu¹, Jie Song, Rui Ma

¹National Center for Safety Evaluation of Drugs, National Institute for Food and Drug Control, Beijing, 100176, China. huer64@126.com

Zhongguo Yi Liao Qi Xie Za Zhi = Chinese Journal of Medical Instrumentation

|March 3, 2012

Summary

This study found that bone cement is not genotoxic. Bone cement did not induce mutations in bacterial tests or damage genes in mammalian cell assays under the tested conditions.

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Area of Science:

Biomaterials Science
Toxicology
Genetics

Context:

Bone cement is widely used in orthopedic surgery.
Assessing the genotoxicity of biomaterials is crucial for patient safety.
Previous genotoxicity data for bone cement is limited.

Purpose:

To evaluate the genotoxic potential of bone cement using bacterial and mammalian cell assays.
To determine if bone cement can induce gene mutations or chromosomal damage.

Summary:

Bone cement was tested using the Ames test and Mouse Lymphoma Assay (MLA) with and without metabolic activation (S9).
No significant increase in reverse mutations was observed in bacterial strains (S. typhimurium, E. coli).
The Mouse Lymphoma Assay showed no significant increases in mutation frequency or small colony mutants.

Impact:

The findings suggest bone cement is not genotoxic under the conditions studied.
This research supports the safety of using bone cement in orthopedic applications.
Provides essential data for regulatory assessment of bone cement safety.