Study of the effect of cement amount on the soil-cement sample strength

This paper presents the results of laboratory tests of low amount organic soil-cement samples. The research program is a continuation of previously reported experience of Wroclaw University of Science and Technology (WrUST) with high amount organic soil sample testing. Over 150 of compression and a dozen of tension tests have been carried out altogether so far. Samples were mixed and stored in laboratory conditions. Several samples were waiting for failure test for over one year after they were formed. Several factors were of crucial importance to the scope of this research: a large number of samples under test, a long observation time (3 months), carrying out the tests in complex cycles of loading and the possibility of registering the loads and deformation in the axial direction. All these made it possible to take into consideration numerous interdependencies which have been presented in this work: the increments of compression strength and the stiffness of soil-cement in relation to time and cement amount. Both compressive strength and elastic modulus were examined on cubic samples. Tensile resistance was derived from the testing of tubular samples. The results are generally in accordance with previous research and the results previously obtained in simultaneous tests by other authors.