Sulfate content of concrete

Sulfate content of concrete

Sulfates are found in concrete either due to ingress into a hardened concrete from an external source or from being cast in from a soluble source during mixing.  In either case, the result is a possibly deleterious expansive effect which in turn may cause disintegration of the matrix of the concrete or cracking of the concrete, both leading to a reduction in overall strength of the concrete element.

Testing can be carried out on concrete dust or lump/core samples, the result being expressed as the percentage sulfate by mass of cement in a sample, industry standards recommending a limit of 4.0% for this value.

Testing can be carried out in accordance with BS1881:Part 124:1988 or by ICP methods to an in-house method, both tests being covered by our *UKAS accreditation.