EVALUATION OF WET AND DRY METHODS OF SIEVE ANALYSIS FOR TROPICAL LATERITIC SOILS IN GHANA

Abstract

Purpose: This paper compares and analyses the results from various soils' wet sieving and dry sieving methods, emphasising lateritic soils. Design/Methodology/Approach: A laboratory study involving soils from six (6) different sources was designed to investigate the disparity between the wet and dry sieve methods of particle distribution of soils. The samples were subjected to wet sieve analysis. Then, dry sieve analysis was performed on the same samples. Following analysis, the soil was categorised using the USCS and the AASHTO classification scheme. The results were then compared for disparities or similarities. Findings: The results indicated a significant disparity in the classification of the same soil using both methods for cohesive lateritic soils. In contrast, the non-cohesive soils showed little to no considerable disparity. In one of the cohesive lateritic soil samples analysed, dry sieving results were used to categorise the soil as well-graded gravel soil, GW, according to the USCS. In contrast, wet sieving results identified the same soil as clayey gravel or gravel-sand-clay mixtures, GC also according to the USCS. According to the AASHTO classification scheme, the same soil was categorised as granular materials with group symbol A-2-6(0) using results from the dry sieving method. Conversely, wet sieving classified the soil as silt-clay material with group symbol A-6(5). Research Limitation: This research focused on the dry and wet methods used to analyse the distribution of particle sizes in soils in Ghana. Practical Implication: This study will assist practising engineers in selecting the appropriate sieve analysis method for design and soil analysis for civil engineering structures. Social Implication: The research contributes to building more resilient and sustainable communities by better understanding and utilising local soil resources. Originality/Value: This research represents a significant advancement in geotechnical testing methodology tailored explicitly to Ghanaian conditions, filling a crucial gap in tropical soil analysis techniques.