Characterization of Yangsan Clay, Pusan, Korea

Tanaka, Hiroyuki; Mishima, Osamu; Tanaka, Masanori; Park, Sung-Zae; Jeong, Gyeong-Hwan; Locat, Jacques

doi:10.3208/sandf.41.2_89

Cited by 27 publications

(3 citation statements)

References 11 publications

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“…It was then found that the three unleached samples had OCR values around 1. This result supports previous findings for the upper clay layer, which is normally consolidated (Tanaka et al 2001). After the leaching procedure, the preconsolidation pressure decreased because of the weakened interparticle bonds, resulting in an additional consolidation process involving large settlements in the field.…”

Section: Evaluation Of Leaching Effects 25supporting

confidence: 93%

Experimental Evaluation of Leaching Effects on the Compressibility of Marine Clay and its Strain Rate Dependency

Kim

2011

Marine Georesources & Geotechnology

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This study investigated how leaching affects compressibility behavior of marine clay and its strain rate dependency based on laboratory tests using three pairs of specimens. Each pair of specimens consisted of leached and unleached samples with identical geotechnical properties except soil salinity. The behavior characteristics of the leached and unleached specimens were evaluated using several series of constant rate-of-strain (CRS) tests with differing strain rates. The results revealed that the compressibility of leached clay increased as its salinity decreased. However, void ratio, Atterberg limits, and preconsolidation pressure in leached samples were lower than those in unleached clay. The increased compressibility and decreased preconsolidation pressure may be induced from a weakening of the interparticle bonds in the leached soil skeleton. The CRS test results with differing strain rates revealed that higher strain rates corresponded with higher levels of effective stress and higher apparent preconsolidation pressure in both leached and unleached clays.

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Section: Evaluation Of Leaching Effects 25supporting

confidence: 93%

Experimental Evaluation of Leaching Effects on the Compressibility of Marine Clay and its Strain Rate Dependency

Kim

2011

Marine Georesources & Geotechnology

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“…Besides Bangkok clay, non-to low swelling soils are generally found in many lowlands, such as Ariake bay in Japan (El-Shafei, 2001; Modmoltin, 2002). Data provided by Tanaka et al (2001) indicate that some marine clays (Pusan, Singapore, Drammen, Louiseville clays) are classiˆed as inactive and normal clays, and are thus non-to low swelling. Even though the clay mineralogy of many clayey soils is primarily montmorillonite, the montmorillonite in those soils might not be the dominant parameter controlling the soil expansivity.…”

Section: Introductionmentioning

confidence: 99%

Strength Development in Cement Admixed Bangkok Clay: Laboratory and Field Investigations

Horpibulsk

Rachan

Suddeepong

et al. 2011

Soils and Foundations

207

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The in-situ deep mixing technique has been established as an eŠective means to eŠect columnar inclusions into soft Bangkok clay to enhance bearing capacity and reduce settlement. In this paper, an attempt is made to identify the critical factors governing the strength development in cement admixed Bangkok clay in both the laboratory and theˆeld. It is found that clay-water/cement ratio, wc/C is the prime parameter controlling the laboratory strength development when the liquidity index varies between 1 and 2. Based on this parameter and Abrams' law, the strength prediction equation for various curing times and combinations of clay water content and cement content is proposed and veriˆed. This will help minimize the number of trials necessary to arrive at the quantity of cement to be admixed. Besides the wc/C, the strength of deep mixing column is controlled by the execution and curing conditions. For low strength improvement (laboratory 28-day strength less than 1,500 kPa), theˆeld strength of the deep mixing columns, quf, made up from both dry and wet mixing methods is higher than 0.6 times the laboratory strength, qul. The quf/qul ratios for the wet mixing columns are generally higher than those for the dry mixing columns. This higher strength ratio is due to the dissipation of the excess water in the column (consolidation) caused by theˆeld stress. The water to cement ratio, W/C, of 1.0 is recommended for the wet mixing method of the soft Bangkok clay. A fast installation rate was shown to provide high quality for low strength columns. Suggestions are made for improving the deep mixing of soft Bangkok clay, which are very useful both from economic and engineering viewpoints.

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“…This research will enable excavated soft Bangkok clay traditionally destined for landfill to develop sustainable lightweight pavement materials, which are significant in terms of engineering, economical and environmental perspectives. This research outcome can be applied to other marine clays such as Changi clay in Singapore, Ariake clay in Japan, and Pusan clay in Korea (Ohtsubo et al, 2000;Tanaka et al, 2001;Arulrajah et al, 2007;Arulrajah and Bo, 2008;Chu et al, 2009). C = cement; AF = air foam; CXXX = mix proportion of cement weight to wet soil volume in (kg/m 3 ); AFYY = mix proportion of air-foam content to wet soil volume in (%); NA* = not available data due to the mixture of specimen is unstable (large segregation of mixture specimen).…”

Section: Introductionmentioning

confidence: 96%