Water-Soluble Sulphate (WS)
Site Test
Lab Test
The Water-Soluble Sulphate (WS) test measures the amount of sulphate present in soils or aggregates that can dissolve in water. These sulphates can react with concrete and cement-based materials, potentially causing deterioration over time. The test helps determine whether the material presents a risk of sulphate attack in construction environments.

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The Process

A representative sample of soil or aggregate is dried and prepared before being mixed with water to dissolve the soluble sulphates. The solution is then analysed in the laboratory to determine the concentration of sulphate present. The measured sulphate content is typically reported as milligrams per kilogram (mg/kg) of material.

The Reason

High sulphate levels in the ground can react with concrete and cementitious materials, leading to expansion, cracking, and long-term structural damage. Testing identifies potential sulphate risks early in a project so that appropriate concrete specifications or protective measures can be implemented.

The Application

Water-soluble sulphate testing is commonly carried out during ground investigations and earthworks projects. The results are used to classify ground conditions and guide the selection of suitable concrete types, foundation designs, and protective measures to ensure long-term durability.

Frequently Asked Questions

Why is sulphate testing important before construction?

High sulphate concentrations in soil can damage concrete foundations and buried structures. Amtest testing helps identify sulphate risks early so the correct concrete specification can be selected.

What materials can Amtest test for water-soluble sulphates?

Amtest can analyse soils, aggregates, and other construction materials where sulphate levels may affect concrete durability.

How do I arrange sulphate testing with Amtest?

You can contact Amtest to organise soil or aggregate sample testing. Our laboratory team will confirm the required sample size, testing process, and expected reporting timeframe.

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Water-Soluble Sulphate (WS)

The Water-Soluble Sulphate (WS) Test determines the concentration of soluble sulphates in soil or aggregate, which is important for assessing the risk of sulphate attack on concrete in construction projects.

The Process

  1. Sample Preparation: A representative soil or aggregate sample is collected for analysis.
  2. Extraction: The sample is mixed with distilled water to extract water-soluble sulphates. The mixture is filtered to separate the liquid from the solid particles.
  3. Testing: The solution is then tested using a titration method, where the amount of soluble sulphate in the sample is measured.
  4. Calculation: The concentration of water-soluble sulphates is expressed as a percentage by weight of the original sample.

Why Is This Test Important?

  • Sulphate Attack Risk: High levels of water-soluble sulphates can cause harmful reactions in concrete, leading to cracking, expansion, and long-term damage to structures.
  • Material Suitability: Helps ensure that materials used in concrete are compatible and won't result in durability issues due to sulphate exposure.
  • Compliance: Meets regulatory and industry standards to ensure that concrete mixes are safe and long-lasting.

The Water-Soluble Sulphate (WS) Test is essential for evaluating the risk of sulphate attack and ensuring the longevity of concrete structures. Contact us for accurate and reliable testing.