Effects of Clay and Moisture Content on Direct Shear Tests for Clay-Sand Mixtures

Table 1

Physical properties of Al-Qatif clay.

Property	Range
Material passing sieve no. 200	>90%
Liquid limit	130–150
Plastic limit	60–70
Plasticity index	70–80
Maximum dry density	1.150–1.200 gm/cm^3
Optimum moisture content	32–40%.
Swell per cent (ASTM D4546)	16–18%
Swelling pressure (ASTM D4546)	5.000–8.000 kg/cm^2 (γ = 1.200 gm/cm^3)

After Dafalla et al. [4].