The shrinkage characteristics of plastic clay

This investigation was conducted to determine the shrinkage properties of a clay soil whose structure had been artificially altered in the laboratory. Various percentages of dispersing and flocculating agent were added to the soil and the shrinkage curves plotted. The shrinkage curves of the chemically treated soil were compared with those of the untreated soil. The values of the theoretical and observed shrinkage limits were also compared to determine the validity of the standard shrinkage limit test which, at present, does not take into consideration the structure of the soil. An explanation of the differences in the shrinkage characteristics of the soil is presented based on the theories of clay energy and particle orientation. The effect of structure on other soil properties is discussed and suggestions for further research are made --Abstract, page ii