Influence of mix uniformity on the induced solidification of dredged marine clay

Chan, Chee-Ming (2013) Influence of mix uniformity on the induced solidification of dredged marine clay. Environmental Earth Sciences . ISSN 1886-6280

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Official URL: http://dx.doi.org/10.1007/s12665-013-2510-0

Abstract

Ground improvement with soil solidification has been widely applied and has proven to be an effective pre-treatment of soft soil deposits. The solidification procedure usually involves addition and thorough mixing of hydraulic binders with in situ soils, consequently transforming in soft materials into a stronger and stiffer stratum for load bearing. Much has been done on the binder's effectiveness and resulting enhanced properties of the soils, but not as much has been reported of the factors governing in situ mixing efficiency in producing uniform mixtures. While advancement in machinery and computerization of operations have significantly improved soil mixing. individual factors contributing to the process can be further examined to refine the effectiveness. This paper describes a series or laboratory tests, mainly unconfined compressive strength tests complemented with X-ray computer tomography, conducted on cement-stabilized dredged Kawasaki clay of different uniformities. A number of factors affecting uniformity were examined, namely the water/cement (WC) ratios, number of cement layers in the initial state as well as the number of mixing cycles adopted Test specimens were prepared based on a systematic combination of these factors to enable a comprehensive cross-analysis of the result. It was found that the clay's initial consistency was markedly altered by cement addition, which resulted in either enhanced or reduced workability of the mixture. Whille increased mixing vigor could apparently overcome poor distribution of binder in the mixture, the resulting strength remained very much affected by the WC ratio, suggesting dependency of the mixture's overall uniformity on a combination of the factors.

Item Type:Article
Uncontrolled Keywords:solidification; uniformity; mixing; unconfined compressive strength; X-ray computer; tomography
Subjects:T Technology > TD Environmental technology. Sanitary engineering > TD878-880 Soil pollution. Soil remediation
ID Code:3971
Deposited By:Normajihan Abd. Rahman
Deposited On:24 Jul 2013 12:11
Last Modified:24 Jul 2013 12:11

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