Buried concrete can be attacked by chemicals within the soil. This can lead to a reduction in strength and a shortened lifespan of the asset. It is therefore important to determine the aggressiveness of the ground so that the concrete mix to be designed appropriately.
Much of the UK is underlain by soils that contain sulphates or sulphides (e.g. pyrite) that can oxidise to become sulphates. It is principally these substances that cause the chemical attack on buried concrete. Other substances also attack the concrete including chloride and magnesium.
We undertake a holistic assessment of a site to characterise the aggressiveness of the ground. This allows a safe design to be undertaken without being overly conservative.
Initially, we review geological maps to determine the likelihood of encountering soils containing pyrites. We also review historical maps to determine if the site has been used for industrial purposes in the past and is, therefore, a ‘brownfield’ site.
Following the initial review we undertake a ground investigation which includes sampling of the soil and laboratory testing. We analyse the results to determine a Design Sulphate Class and an ACEC (Aggressive Chemical Environment for Concrete) Class. This then allows the foundation designer to specify the correct concrete mix with additional protection measures where appropriate.
“I used Soiltechnics for some soil testing at one of my sites in Gravesend. Soiltechnics are an amazing company to work with, they are really good at communicating all matters clearly as well as being very prompt and always helpful. The way they set up quotes is great as it makes it absolutely clear what is and isn't included and what other options you might want to consider.”
“I approached Soiltechnics when a project I was working on needed an urgent soil contamination report. Fortunately, Soiltechnics made themselves immediately available and the quick turn around helped us avoid delays. Additionally, Soiltechnics were extremely helpful in explaining the technical aspects of the ground investigation and in helping us understand the potential site specific risks.”
“Having worked with Soiltechnics for ten years, they are considered a trusted member of our supply chain. Soiltechnics form part of the Willmott Dixon Consultant Consortia having successfully completed a robust selection process which highlighted their ability to perform with professionalism, value for money and safety."