Ask us a question

    Concrete deterioration in Quebec, Canada

    RSK’s materials and structures team was engaged in a major Canadian court case with a value exceeding CAD200 000 000 in late 2019. The work involved Dr Ian Sims and Dr Ian Blanchard acting as expert witnesses in relation to the premature deterioration of concrete used in several hundred houses and almost 100 commercial buildings built across an area of central Quebec.

    The cause of deterioration was the coarse aggregate, which contained the iron sulphide mineral pyrrhotite, in the concrete used for the foundations and supporting walls of the buildings. Unfortunately, the issues only became apparent several years after placement, so similarly defective concrete was produced over about five years.

    The deterioration of sulphide minerals, in particular iron sulphides, in the presence of water leads to the production of sulfuric acid. This potentially results in both acid attack on cement and any limestone aggregate, and the release of damaging sulphate ions that cause internal sulphate attack. Both of these lead to weakening and cracking. Although this reaction may occur slightly for the common iron sulphide pyrite when it typically produces no more than surface popouts and some superficial staining, the reaction with pyrrhotite is much more rapid and results in extensive and, at times, structurally significant damage. The reaction of pyrrhotite in concrete aggregate had previously been rarely reported in academic literature (about six separate occurrences over the previous century) but was poorly and inconsistently detailed in standards and other industry documents.

    RSK’s involvement in the court case included assessing the actions, advice given and professionalism of various third-party laboratories and consultancies, and to what extent they were providing guidance to the quarry’s operators and concrete producers regarding the suitability or otherwise of the aggregate. The quarry was co-owned by two competitor concrete producers. A site visit to the quarry confirmed previously suggested variations in the composition and mineralogy of the coarse aggregate material being used.

    For further information, please contact Dr Ian Blanchard, +44 (0)7739 647 476

     

    • Location: Canada
    • Client: Undisclosed
    • Project status: Complete
    • Clear filters
    Found 212 Results
    Page 1 of 18
    Supporting the creation of a new garden village in Cheshire
    View Project
    Repairing lightning damage on a wind turbine in Scotland
    View Project
    Helping Singapore meet its future waste disposal needs
    View Project
    Designing and assessing an onshore wind farm in the Highlands of Scotland
    View Project
    Designing and assessing proposed windfarms in Scotland
    View Project
    Environmental and social risk appraisal support for African “power-to-x” development
    View Project
    Consulting on the construction of the Keppel Marina East Desalination Plant, Singapore
    View Project
    Bringing international best practice and process to phase 2 of Singapore’s Deep Tunnel Sewerage System
    View Project
    Facilitating renewable energy investments in Europe
    View Project
    Ensuring shale gas projects for Poland and beyond
    View Project
    Providing award-winning storm water solutions for urban flooding challenges
    View Project
    Upgrading sewage treatment facilities to serve community needs in Hong Kong
    View Project

    📢 RSK Group is delighted to announce that we are one of the sponsors of the Ground Source Heat Pump Association’s conference and charity dinner.

    🤝 The Conference is an opportunity to gain insight into the heat pump installation industry, through a series of coordinated expert panel sessions, presentations, and networking opportunities.

    💚 Geocore Site Investigations Ltd, Ground Heat, ZED and Carbon Zero Consulting will be attending this event.

    We can’t wait to see you there!

    📅 30th September 2022
    📍 The Coniston Hotel Country Estate & Spa, Skipton

    #Energy #Heating #GroundSourceHeatPumps #HeatPumps #Event #Conference #GroundHeat
    ...

    📢 RSK Tanzania is proud to host NICOLA – CONNECT, organized by the Network for Industrially Contaminated Land in Africa.

    🤝 NICOLA – CONNECT provides a platform for social and technical interaction between members of NICOLA, and professionals interested in Contaminated Land or associated fields, in a casual setting.

    📅 5th October 2022
    📍 Golden Tulip Hotel, Dar Es Salaam, Tanzania.

    Kindly RSVP to hkimario@ rsk.co.uk ASAP to reserve your seat.
    To call for enquiries, contact: +255 719 697 323

    We look forward to seeing you there!

    #Tanzania #Event #ContaminatedLand #Africa #Land #Environment #Environmental
    ...

    🤝 Society is moving towards a more equitable and sustainable world.

    🏙️ Our cities sit at the centre of this modern world: they grow and change as we do.

    🤔 As we face unprecedented challenges today, how will our cities evolve to serve our needs in the future?

    📌 RSK’s Cities of Tomorrow series explores the sustainable solutions available to us to create resilient and future-proof urban centres.

    Stay tuned to find out more!

    #Sustainability #ClimateChange #ClimateCrisis #Environment #Environmental #Sustainable
    ...

    🚗 As we return to offices, how we commute to work will play an important role in our ambitions to achieve net zero targets.

    🤝 Businesses play a crucial part in facilitating action towards these goals.

    🚆 In this edition of our series Climate Realities, Ian Wickett, Senior Associate Director at RSK Transport Planning, tells us why everyday changes, supported by business, are of vital importance.

    Read more in our bio!

    #Transport #NetZero #Commute #Environment #Environmental #ClimateChange
    ...

    📢 We are attending Wind Energy Hamburg 2022, the world’s leading wind industry gathering!

    📌Get in touch if you’d like to discuss renewable energy solutions with our team of experts:

    ✔Mike Kelly, Renewable Energy Business Development Director
    ✔Michael Kerr, Regional Business Development Director
    ✔Peter Gettinby, Land Director
    ✔Sam Cranston, Director, Energy Infrastructure
    ✔Joe Farnell, Technical Sales Manager
    ✔Rob Baker, Technical Manager

    Let’s decarbonise energy together 💚

    We can’t wait to see you there!

    #WindEnergyHamburg #WindEnergy #Renewables #RenewableEnergy #CleanEnergy #GreenEnergy
    ...