PENDEKATAN KORELASI KANDUNGAN FRAKSI HALUS DALAM MENENTUKAN POTENSI PLASTISITAS PADA LEMPUNG BERPLASTISITAS RENDAH

Hendra Saputra

Abstract

Abstract

Plasticity is a significant geotechnical characteristic that is affected by the fine-grained fraction of soil. This paper describes an alternate method for determining plasticity potential in low plasticity (CL) clays by comparing fine fraction (FC) concentration to sand content. The study used descriptive statistics and Pearson correlation to investigate the relationship that exists between consistency limits (LL, PI), grain fractions (sand, silt, clay), and derived parameters (FC, sand-silt-clay spectrum, and sand fraction ratio). Two categorisation systems, Casagrande (1948) and Moreno-Maroto (2021), were examined, revealing disparities between the CL and ML classifications, particularly at the plasticity transition region. After eliminating outliers thru the interquartile range (IQR), 61 samples were analysed, indicating significant correlations: a positive relationship between sand content and sand ratio (SR), and negative correlations between sand content and FC, as well as FC and SR. The results show that FC can be used as an alternative to predict plasticity potential behavior. The study emphasises the limits of traditional plasticity indices and recommends incorporating fine fraction analysis to improve geotechnical assessments. This approach provides a simplified, statistically proven way for assessing plasticity potential, particularly in low-plasticity clays with minimal site-specific data.

Keywords: clay plasticity; fine fraction content; low-plasticity clay; Pearson correlation; soil classification

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DOI: https://doi.org/10.20961/mateksi.v13i1.99122

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