TableĀ 3.

Composition of Lower Lias Clay from M5 bridge foundations in Gloucestershire, UK from XRD analyses and sulfur speciation by wet chemical methods

MaterialQuartz (%)Calcite (%)Clay (%)Total S (%)Water-soluble sulfate (%)Pyrite FeS2 (%)Gypsum CaSO4.2H2O (%)
XRDChemXRDChem
Unweathered Lower Lias Clay924471.20.061.61.90.60.3
Weathered Lower Lias Clay924430.80.070.51.47.91.3
Made ground (weathered and unweathered Lower Lias Clay)1319490.90.10.81.50.90.4

Pyrite (chem): calculated from total sulfur and acid-soluble sulfur values; gypsum (chem): calculated from acid- soluble sulfur values (data from Floyd et al. 2003).