Uniaxial Testing of Soil–Cement Composites to Obtain Correlations to Be Used in Numerical Modeling

Abstract

This paper presents the results of laboratory testing of samples obtained from soil–cement composite columns produced on a real-world test site as part of a research and development project. The introduction presents the motivation of the research and the goals that guided the layout of a research program. The general geotechnical conditions, initially assumed methodology of soil–cement composite sampling, and finally, the methodology of strength tests were presented. In tests conducted with the measurement of the strain-stress path, the strength and stiffness of the material were determined in various modes of the stress–strain path, including unloading/reloading cycles. The test results were presented in the form of graphs presenting soil–cement composite stiffness in the function of material strength and subjected to a short critical discussion against the background of reference samples from composites prepared in laboratory conditions. This allowed for their qualitative and quantitative assessment and the formulation of conclusions and guidelines, concerning the execution of works and especially the potential practical outcomes (benefits for numerical modeling), juxtaposed in the summary. Some prospects and needs for future developments were also formulated on the basis of actual experience.

Innovative Quality Assessment of Pavement Subgrades Using the Glegg Impact Soil Tester

“…• Identification of the ability of CIST to assess the quality of cohesive soils up to a compression value of 40 mm, corresponding to a CBR of 2.2% and a modulus of subgrade deformation of 20 MPa; Based on the objectified research results, the authors foresee the application of CIST for the systematic quality control (Figure 20) of the subsoil, including its modeling [27]. These are mainly clay subsoils, consolidations of weak soils, geogrid-stabilized soils, the performance of unsterilized and triaxially geogrid-stabilized sandy soils [28][29][30], and Blast-Furnace Slag [31]. Generally, CIST can be used for the quality control of fine-grained soils in the context of the current upgrading of the Slovak main railway lines, which are part of the significant European corridors AGC, AGTC, and TEN-T [25,26].…”

Cement Stabilization of Waste from Contaminated Soils in Terms of Its Installation into Engineered Landfill

“…That last issue is usually underrated, as most of the published results refer to the standard 28-day time of curing. The authors' recent experience proves the necessity of prolonging the curing times of the DSM samples up to two or even three months to gain valuable and reliable information [35]. But this should always be tested individually and there is no real chance to obtain juxtaposed data for all possible combinations of soils and binders.…”