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Related Concept Videos

Testing Water Quality01:14

Testing Water Quality

195
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
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Deleterious Substances in Aggregate01:25

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Deleterious substances in aggregates can be detrimental to the quality and durability of concrete. These substances include organic impurities like loam, which interfere with cement hydration and are usually present in the sand. These prevent a good bond between aggregate and cement paste. Organic impurities can be detected using the colorimetric test, where the darkness of a solution after agitation indicates the level of organic content.
Another type of impurity is clay and fine material that...
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Related Experiment Video

Updated: Sep 24, 2025

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
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A standardized method for evaluating test soils used to demonstrate cleaning efficacy.

T A Kremer1, R Bancroft2, Z Patel2

  • 1Johnson & Johnson, Raritan, NJ, USA.

The Journal of Hospital Infection
|May 4, 2022
PubMed
Summary
This summary is machine-generated.

New international standards ensure reusable medical devices are safely cleaned. This study validated various test soils, including Artificial Test Soil (ATS 2015) and blood-based soils, confirming their acceptable performance for washer-disinfector cleaning efficacy.

Keywords:
CleaningISO 15883–5, wReusable deviceTest soilWasher-disinfector

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Area of Science:

  • Medical device reprocessing
  • Infection control
  • Biomedical engineering

Background:

  • Cleaning validation is critical for safe reusable medical device use.
  • Global standards for cleaning validation and test soils have historically varied.
  • Recent international standards (ISO 15883-5:2021) now specify cleaning endpoints and test soil requirements.

Purpose of the Study:

  • To quantitatively compare the performance of various test soils.
  • To evaluate test soils using a new standardized method (ISO 15883-5:2021 Annex B).
  • To assess cleaning efficacy for washer-disinfectors.

Main Methods:

  • A quantitative comparison of seven distinct test soils was performed.
  • The standardized test method from ISO 15883-5:2021 Annex B was utilized.
  • Test soils included Artificial Test Soil (ATS 2015), various blood-based soils, and UK Test Soil.

Main Results:

  • All tested soils met the performance criteria outlined in the standard.
  • The study demonstrated the applicability of the new standardized method.
  • Consistent performance was observed across different types of test soils.

Conclusions:

  • The evaluated test soils are suitable for demonstrating cleaning efficacy according to the new international standard.
  • The findings support the use of standardized test soils for cleaning validation.
  • This research contributes to harmonized global practices for medical device reprocessing.