Stabilization of lateritic soil with blast furnace slag
M.A. Mojeed1, R.A. Taiwo2,*, A.H. Adegoke3
Lateritic soil is usually poorly graded and needs to be stabilized.
Samples were mixed with blast furnace slag with varying percentages of 0, 2, 4, 6, 8 and 10%.
Samples were tested for compaction, undrained compressive & shear strength, and CBR.
The undrained compressive strength improves at 8% and 2% addition of blast furnace slag to samples.
Blast furnace slag is a good soil stabilizer.
Lateritic soil is a group of extremely weathered soil. The soil is formed by the concentration of hydrated oxides of iron and aluminum. Most of the lateritic soil has considerable high compaction densities. However, under moisture conditions and adverse traffic, the lateritic soil performs poorly. Thus, such behavior of soil can lead to great damage of engineered structures and therefore it is important to treat the soil in order to be useful for engineering purposes. The aim of this research is to evaluate the engineering properties of lateritic soil that is stabilized with blast furnace slag. The lateritic soil was collected from a proposed site for the construction of an indoor sports hall at the Obanla campus of the Federal University of Technology, Akure located in the western part of Nigeria. Two samples (Samples A and B) were collected at depth 0.7 -1 m from different locations. The samples were mixed with blast furnace slag with varying percentages of 0, 2, 4, 6, 8 and 10% and were tested for compaction, undrained compressive & shear strength, and California bearing ratio (CBR). All tests were performed in accordance to the British Standards (BS 1377). The interpretation of the results shows that Sample A gives optimum engineering performance in terms of Atterberg limit, compaction and CBR when 6% of the blast furnace is added to it. Furthermore, Sample B gives optimum engineering properties (in terms of Atterberg limit, compaction and CBR) when 8% of blast furnace slag is added to it. However, the undrained compressive strength improves at 8% and 2% addition of blast furnace slag to Samples A and B respectively.