| Abstract [eng] |
Geotechnical Characterization of a Triassic Clay-Cement Mix. This thesis deals with modification of Triassic clay with cement, using soil-cement mixing method. For tracking of the changes in geotechnical parameters between clay-cement mix and natural Triassic clay, data from earlier researches were used. During the preparation of the clay-cement mix, 40 % of water was added to the dry natural clay. Also there were made three different groups of specimens were they had different amount of cement (5, 10 and 15 %). The tests were executed during three stages of stiffening – a 2, 14 and 26 days after the start of the research. During the Research a strict schedule was made. The time of execution of the test were shown in the schedule. Geotechnical properties of clay-cement mix were established. The density, water content, index of plasticity, consistency, and liquid limits were obtained. Unconfined undrained compression tests were conducted and parameters of unconfined shear strength were obtained. Analyzed data has shown that the clay-cement mixtures with 15 % of cement in the content has improved the most, the cement addition of 5 and 10 % has a low impact to the properties of strength. The relevance of the thesis is to suggest the usage of Triassic clay-cement mix as the part of an engineered barrier through the construction of a new Near Surface Repository facility will be designed, and subsequently constructed, for the disposal of Short-lived Low and Intermediate Radioactive Waste. |
