Table 1: Physical properties of Al-Qatif clay.

PropertyRange

Material passing sieve no. 200>90%
Liquid limit130–150
Plastic limit60–70
Plasticity index70–80
Maximum dry density1.150–1.200 gm/cm3
Optimum moisture content 32–40%.
Swell per cent (ASTM D4546) 16–18%
Swelling pressure (ASTM D4546)5.000–8.000 kg/cm2 (γ = 1.200 gm/cm3)

After Dafalla et al. [4].