Geochemical Analysis of Ilaro-Papalanto Highway Subgrade

Abstract

In this study, the geochemical analysis of the subgrade at different locations of Ilaro-Papalanto highway was conducted using Atomic Absorption Spectrometry (AAS) and X-Ray Diffractometry (XRD). The predominant oxides present in both soil samples are Silicon Oxide (40% - 45%) and Aluminium Oxide (31% - 34%), and the average silica content of Ilaro and Papalanto are 45.71% and 40.71% respectively, which implies that Ilaro soil sample is more chemically inert and structurally stable than Papalanto soil samples. The average sesquioxide content of Papalanto (36.27%) is higher than that of Ilaro (32.87%), while the silica sesquioxide ratio (SSR) of Papalanto (1.12%) is less than that of Ilaro (1.39%), therefore both soil samples are in advanced stage of weathering but Papalanto soil is more lateritic than Ilaro. Geochemical analysis using XRD indicated the presence of three clay minerals (Kaolinite, Illite and traces of Montmorrrilonite) and one major non-clay mineral, Quartz. The average proportion of Kaolinite in the soil samples are 9% (Ilaro) and 28% (Papalanto), but the average values of Quartz are 62% and 69% for Ilaro and Papalanto, respectively. The higher proportion of sesquioxide and Kaolinite from Papalanto samples is an indication of more failures observed in the region.

Geotechnical Stabilization Potential of Cement Admixed with Rice Husk Ash on the Crude Oil Polluted Laterite Soil: A Case Study of Ebendo, Delta State, Nigeria

“…This result therefore indicates that the soil sample is a Laterite. The higher content of the silicon oxide in the soil is an indication that the soil is chemically inert and structurally stable (Meshida and Akanbi, 2007;Apata and Adedokun, 2020), and the soils that exhibit these properties are able to withstand traffic loads and surface deformations (Apata and Adedokun, 2020). The results of the physicochemical test conducted on the Brent crude oil sample were presented as shown in Table 2.…”

Evaluation of the Statistical Significance of Compactive Efforts, Slag and Cement on the Geotechnical Features of Laterite Soil

“…In addition, the maximum value of 5 and 6% specified by ASTM C618-12 [41] for the SO3 of cementitious material is satisfied by this steel slag with 0.03%. According to Gidigasu [42] and Apata and Adedokun [43], the ferric oxide is an important cementing agent in lateritic soils and higher content of this oxide could lead to the formation of strong bond and strength in the lateritic soil when dried.…”