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BS 1881-124:2015 Hardened Concrete Testing

Specialist BS 1881-124:2015 Hardened Concrete Testing

The Testing Lab PLC (TTL) provides BS 1881-124:2015 testing for analysing hardened concrete to determine constituent materials and key properties across England, Scotland and Wales.
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Specialist BS 1881-124:2015 Hardened Concrete Testing

The Testing Lab PLC (TTL) provides BS 1881-124:2015 testing for analysing hardened concrete to determine constituent materials and key properties across England, Scotland and Wales.
Get An Instant Quote Request A Call Back

BS 1881-124:2015 Hardened Concrete Testing Across England, Scotland & Wales

BS 1881-124:2015 sets out methods for analysing hardened concrete to determine its constituent materials and key properties. The standard is used when investigating existing structures, assessing compliance, or diagnosing deterioration. The 2021 amendment (A1:2021) refines accuracy and precision expectations for several test methods

Summary of testing in BS 1881-124:2015

  • 1. Sampling

    • Provides procedures for obtaining representative samples of hardened concrete from structures or test elements.

    • Emphasises correct extraction, handling, and documentation to avoid contamination or alteration.

    2. Treatment of samples

    • Details how samples must be prepared before analysis, including crushing, drying, and sieving.

    • Ensures uniformity so that chemical and physical tests yield reliable results.

    3. Cement and aggregate content

    • Outlines chemical methods to determine cement content and aggregate content.

    • Includes an alternative method based on insoluble residue for aggregate determination.

    • Provides apparatus examples (e.g., CO₂ determination setup).

    4. Aggregate grading

    • Specifies procedures for determining the particle size distribution of aggregates recovered from the concrete.

    • Helps assess original mix design and potential degradation.

  • 5. Original water content

    • Describes methods to estimate water content at the time of mixing, based on chemical analysis and mass balance.

    • Useful for back-calculating the water–cement ratio.

    6. Identification of materials

    The standard includes tests to identify:

    • Type of cement

    • Type of aggregate

    • Other constituents such as admixtures or additions

    7. Chemical content tests

    BS 1881-124 also covers determination of:

    • Chloride content

    • Sulphate content

    • Alkali content

    These are critical for assessing corrosion risk and durability.

    8. Reporting requirements

    • Specifies the format and detail required in test reports.

    • The 2021 amendment adds clearer guidance on accuracy of reported results, expected repeatability and reproducibility, and precision levels for the five main test methods.

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Contact our BS 1881-124:2015 testing team

To discuss BS 1881-124:2015 hardened concrete testing, or to request a quotation, please contact our experienced and dedicated team:

Tel: 0800 177 7264
Email: [email protected]

Or please complete our online call back form by clicking on the “Call Me” button, and we’ll respond promptly.

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WHY CHOOSE THE TESTING LAB PLC FOR BS 1881-124:2015 TESTING?

Specialist construction materials testing provider
Support for hardened concrete analysis to help understand constituent materials and key durability-related properties across England, Scotland and Wales.

Clear, practical reporting
Results presented in a structured format to support investigations, compliance checks and engineering reviews.

Support for investigations and durability assessment
Testing to help inform root-cause analysis, maintenance planning and remediation decisions.

Independent. Nationwide.
Supporting clients across England, Scotland & Wales from our National Control Centre.

Areas we cover

From our National Control Centre, we provide BS 1881-124:2015 testing services across:

We can support:

  • Investigation of existing concrete structures and deterioration diagnosis

  • Compliance and technical assessments requiring hardened concrete analysis

  • Cement and aggregate content determination and aggregate grading

  • Chloride, sulphate and alkali testing to support durability and corrosion risk reviews

  • Clear reporting aligned to BS 1881-124:2015 and A1:2021 expectations

FREQUENTLY ASKED QUESTIONS ABOUT BS 1881-124:2015 TESTING

  • What is BS 1881-124:2015 used for?
    It provides methods for analysing hardened concrete to determine constituents (such as cement and aggregates) and key chemical indicators used in investigations, compliance and deterioration diagnosis.

  • What does sampling involve under the standard?
    Sampling focuses on obtaining representative hardened concrete samples with correct extraction, handling and documentation to avoid contamination or alteration.

  • What chemical contents are commonly assessed?
    BS 1881-124:2015 includes methods for chloride, sulphate and alkali content determination—important for assessing durability and corrosion risk.

  • Can the testing help estimate the original water content or water–cement ratio?
    Yes. The standard includes methods to estimate original water content using chemical analysis and mass balance, supporting back-calculation of water–cement ratio.

  • Does BS 1881-124 specify reporting requirements?
    Yes. It sets out report structure and detail, and the A1:2021 amendment provides clearer guidance on accuracy, repeatability, reproducibility and precision expectations.

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Lothian Hotels Ltd

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