Sulphate (Red Ash) Testing & Removal
Domestic properties that are most likely to be at risk from Sulphate attack tend to have been built between the mid 1940’s and early 1980’s. Primarily located in Staffordshire, Middlesbrough, The Black Country, and Leeds areas. The reason for this being the various industrial hard-core infill materials containing Sulphates were used during construction. It is now against building regulations to use sulphate contaminated fill, due to the high risk of sulphate attack.
When Sulfates come in contact with concrete it can cause chemical changes to the cement, which can cause significant micro-structural effects leading to the weakening of the cement binder (chemical sulfate attack). Sulfate solutions can also cause damage to porous cementitious materials through crystallization and recrystallization (salt attack).Sulfates (sulphates) and sulfite's are ubiquitous in the natural environment and are present from many sources, including gypsum (calcium sulfate) often present as an additive in 'blended' cements which include fly ash and other sources of sulphate.
The inspection itself involves taking a small sample of Sulphate from below the internal concrete/slab. This is obtained by drilling a bore hole through the existing slab from which a sample of the Sulphate can be extracted. The sample is then sent for scientific laboratory analysis. What level of work that's necessary is dependent on the acidity level of the reading.
Contact MPS today for a free, no obligation quote of your red ash testing & removal requirements.
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