Global Journal of Researches in Engineering, E: Civil & Structural, Volume 23 Issue 2

Figure 6 shows the strain, versus log stress, and the curve obtained from the oedometer test for both untreated and treated clay specimens of 6% CaSiO3 treated sample cured for 28 days. a) The values for untreated black clay of compression index, Cc and recompression index, Cr are 0.14 and 0.005, respectively. b) While the Cc and Cr values for treated samples are 0.0875 and 0.0025, respectively. c) Finally, the Cc and Cr values for untreated brown fine laterite specimen are 0.100 and 0.0025, respectively. VII. C onclusion Firstly, it was important to run the same UCS test carried out on samples treated with either cement or calcium silicate had to be carried out under alternating conditions of extreme temperature (heat transferred by a bituminous coating of about 110*C for 24H) and relative humidity absorbance by capillary lift at 25*C. It’s shown that the specimen treated by cement absorbed much more water than the one treated by silicate. Secondly, running the consolidation process, has shown that the compression index, Cc value of the treated black clay compared to the untreated black clay decreases by 0.0525, has indicated a significant improvement of the resistance to compressibility due to CaSiO3 treatment. Also, the water content percentile decreased from 47% to 44% after the consolidation process of the 02 specimens of black clay. However, black clay has always been rejected in Senegal as a soil material that can support any construction. This study of its behavior in an environment of alternating heat and water makes it fragile and confirms its unsuitability for any use as a support soil or subgrade without other specific treatment. Finally, the cement-treated sample was found to absorb much more water than the calcium silicate- treated sample. This would make it less resistant over time. A cknowledgements We would like to express our sincere gratitude to my hosting Professor, Matt Evans and his research assistant, Ehsan Yazdani for their invaluable guidance and support throughout the research process at Oregon State University (OSU). We also want to thank the Ageroute Senegalese Agency for their financial support, as well as the research technicians and students who participated to this work at the Merryfield 108 laboratory of the Civil and Construction Engineering department (CCE) at the OSU for their assistance in finding the necessary research materials. Finally, we are grateful to Curve (c): untreated fine laterite Cr=0.0025 and Cc=0.100 Global Journal of Researches in Engineering © 2023 Global Journals ( ) E Volume XxXIII Issue II Version I 52 Year 2023 Stabilization of a Sub-Saharan Laterite Soil using Calcium Silicate -5% 0% 5% 10% 15% 20% 25% 30% 10 100 1000 10000 Strain (%) Vertical Stress (kPa)