ISSN: 0149-6115
Published Online: 8 September 2008
Page Count: 12

Modified Ohio’s Curves: A Rapid Estimation of Compaction Curves for Coarse- and Fine-Grained Soils

Horpibulsuk, Suksun
Associate Professor,Suranaree University of Technology,Nakhon Ratchasima,

Katkan, Wanchai
Lecturer,Rajamangala University of Technology Isan,Nakhon Ratchasima,

Naramitkornburee, Anek
M.Eng. Scholar,Suranaree University of Technology,Nakhon Ratchasima,

(Received 7 January 2008; accepted 29 July 2008)

Abstract

Compaction curves from 16 coarse- and 9 fine-grained soils, which cover all soil types classified by the Unified Soil Classification System are analyzed to develop the Modified Ohio’s curves. For all soils, the relationships between water content and degree of saturation on both the dry and the wet sides of optimum are represented by power functions. Their compaction curves under standard Proctor energy follow the Ohio’s curves. Optimum degree of saturation, ODS, of coarse-grained soils is lower than that of fine-grained soils. However, for a given soil, the ODS is practically the same for different compaction energies, E. Even though compaction characteristics (optimum water content, OWC, and maximum dry unit weight, γ^d max) are different for different soils, their relationship between normalized OWC/OWC^st and E is practically the same, where OWC^st is the OWC at standard Proctor energy. Based on this finding, the Modified Ohio’s curves are introduced under compaction energy levels of the half standard, half modified, and modified Proctor energies. The verification of the Modified Ohio’s curve is also illustrated in this paper. These curves are useful in rapid estimation of laboratory compaction curves from a single set data of dry unit weight and water content.

Keywords:
compaction curve, compaction energy, fine-grained soils, coarse-grained soils, Modified Ohio’s compaction curves

Paper ID: GTJ101659
DOI: 10.1520/GTJ101659
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