Compaction Control Using Degree of Saturation and Plasticity Index on Tropical Soil

Hasbullah Nawir; Laras Dipa Pramudita; Tita Kartika Dewi; Dayu Apoji; Sugeng Krisnanto

doi:10.5614/j.eng.technol.sci.2023.55.3.5

Authors

Hasbullah Nawir Geotechnical Engineering Research Division, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132,
Laras Dipa Pramudita Geotechnical Engineering Expertise Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jalan Ganesa No. 10, Bandung 40132, Indonesia
Tita Kartika Dewi Geotechnical Engineering Expertise Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jalan Ganesa No. 10, Bandung 40132, Indonesia
Dayu Apoji Geosystems Engineering, University of California at Berkeley, 101 Sproul Hall, Berkeley, CA 94720, United States
Sugeng Krisnanto Geotechnical Engineering Expertise Group, Faculty of Civil and Environmental Engineering, Bandung Institute of Technology, Jalan Ganesa No. 10, Bandung 40132, Indonesia

DOI:

https://doi.org/10.5614/j.eng.technol.sci.2023.55.3.5

Keywords:

CBR, degree of saturation, permeability, plasticity index, soil compaction, tropical soil

Abstract

Soil compaction in the field is conventionally controlled using maximum dry density, (?d)_max, and optimum moisture content, (w)_opt, as the target properties. However, achieving accurate control of these target properties can be difficult due to variation of compaction energy level (CEL) and soil type. Recently, a novel soil compaction control approach using optimum degree of saturation, (Sr)_opt, as the target properties has been proposed. It was argued that (Sr)_opt can be a better compaction control property as the value is less sensitive to the variation of CEL and soil type. This paper presents an investigation of the compaction characteristics of tropical soils from several locations in Indonesia based on both primary and secondary data. This study was performed by exploring the relationships between (i) dry density (?d) and Sr, (ii) (?d) and plasticity index (PI), (iii) (?d) and CBR, as well as (iv) (?d) and permeability. This study showed that the (Sr)_opt of the soils was 91.2%, with variation between 81.2% and 96.5%. This study also showed that (?d)_max can be related to PI at a given CEL. It is expected that the proposed relationships can be better references for field compaction control practices in Indonesia.

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