Fermino and Kampf (2006) evaluating the mechanical impedance in substrates concluded that materials with lower dry density
may explain the non-occurrence of significant variations when submitted to different water stresses.
The addition of soil stabilizing agents may also change the optimum moisture content (OMC) and maximum dry density
(MDD) of the soil.
Summary of the Characteristics of Laterite Sample Soil property Percentage composition /classification Particle gradation Gravel 15 Sand 44 Silt and clay 41 Consistency Liquid limit, LL 57.66 Plastic limit, PL 37.41 Plasticity index, PI 20.25 Natural moisture content 7.96 Classification of laterite USCS MH (sandy elastic silt with gravel) AASHTO between A-5 and A-6 (silty-clayey soil) Compaction (Moisture-Density) Maximum dry density
, kg/[m.sup.3] (UNS) 1970 Optimum moisture content, % 27.5 Maximum dry density
, kg/[m.sup.3] (SS) 1930 Optimum moisture content, % 26 Mineralogical test Kaolinite (A[l.sub.2]Si[O.sub.5](OH[4.sub.)]) 53.26 Quartz (Si[O.sub.2]) 46.74 Table 2.
The specific gravity determined according to  and dry density
of the wastes are given in Table 4.
Parameters of natural soil samples that have been tested are as follows: natural water content of 20%~26%, natural density of 1.8~2.0 g/[cm.sup.3], dry density
of 1.5~1.7g/[cm.sup.3], pore ratio of 0.69~0.81, compression index of 0.08~0.15, cohesive force of 35~85kPa, internal friction angle of 9~27[degrees], and free expansion rate of 51-71.
Gallage and Uchimura  studied the effects of dry density
and grain size distribution on the SWCC of sandy soils.
The specific gravity ([G.sub.s]) is 2.64, maximum dry density
([[rho].sub.max]) is 1.66, and minimum dry density
([[rho].sub.min]) is 1.34 g/[cm.sup.3].
The molding conditions for clay sand mixtures are as follows: the 15% clay is prepared at 15.2% moisture content and 18.1 kN/[m.sup.3] dry density
. The 20% clay is prepared at a moisture content of 15% and a density of 18.6 kN/[m.sup.3].
Before testing, soil sample of 25% moisture is dispensed and placed in the moist chamber for 24 hours to permit uniform distribution of water, and then expansive soil specimens in different dry density
conditions are created by being extruded from lifting jack and using a cutting ring.
ABSTRACT: Slope failure is not necessarily related to the shear strength alone, the liquid limit and dry density
in particular are useful indicators in determining the cause for slope failure.