Abstract
The effect of moisture on the tensile strength of packed beds of a variety of particle-size fractions of sodium chloride is reported. At a constant state of packing, the tensile strength of the coarse noncohesive fractions is shown to increase to a plateau as the moisture content rises. This is attributed to an increase in the number and dimension of liquid pendular bonds. For the finer, cohesive fractions, the effect of moisture is initially to cause an increase in tensile strength due possibly to a reduction in interparticle separation as well as pendular bridging. Above a critical moisture content, the tensile strength decreases due to a disruption of the inherent forces of cohesion and the failure to produce new pendular bonds at points of near contact.
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