Effect of moisture supply during desiccation and shrinkage in a landfill liner system

In this study, the effect of moisture supply during desiccation in a landfill liner system under the climatic conditions prevalent in spring and summer in Korea was investigated. The specimens used in the test were a mixture of dredged clay (parent soil) combined with additives Pa or Pb (proprietary cementing materials — Pa is mostly silicate powder and Pb is mostly quicklime). The mixing ratio of the dredged clay to Pa was 5: 1 and that for dredged clay to Pb was 20: 3 (w/w). The effect of moisture supply to the liner system was evaluated in three ways: the uniaxial compressive strength, permeability, and shrinkage tests during desiccation. From the results, the compressive strength of the Pa/Pb-clay mixture without moisture supply decreased more dramatically than that of the Pa/Pb-clay mixture with moisture supply during desiccation. The permeability of the latter decreased more rapidly than that of the former. Shrinkage of the Pa/Pb-clay mixture with moisture supply during the curing process was less than that of the Pa/Pb-clay mixture without moisture supply.