Geotechnical properties of dredged marine sediments treated at high water/cement ratio

Rekik, Boubaker; Boutouil, Mohamed

doi:10.1007/s00367-009-0134-x

Cited by 45 publications

(19 citation statements)

References 11 publications

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“…As reported by Kamaruzzaman et al (1998), cement-treated Singaporean marine clay showed significant improvement of physical properties, unconfined compressive strength and compressibility characteristics with longer curing period. In addition, Rekik and Boutouil (2009) found that the preconsolidation pressure (or yield stress for solidified soils) of a 10 % cement-treated dredged marine soil sample at its natural water content of 160 % underwent 1.75 times improvement between 7 and 28 days, though an extended 1 month curing resulted in limited further improvement.…”

Section: Effect Of Curing Time On Solidificationmentioning

confidence: 96%

Geo-parametric study of dredged marine clay with solidification for potential reuse as good engineering soil

Chan

2016

Environ Earth Sci

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Dredging is an essential process in the development, expansion and maintenance of ports, jetties and various water bodies. The process of removing sediments to create or maintain certain water depths inevitably produces large amounts of dredge materials. These displaced materials are generally soils of fine-grained nature, i.e., clay and silt size particles with limited usability due to low strengths and high compressibility. Besides, exposure of the sediments to contamination via the waterways has made disposal of the material a much more regulated and often costly practise, with uncertain risks of future detrimental effects to the dump site's surrounding environment. It is therefore favourable to explore the reusability of the dredged soils to minimise the need dumping. The present study examines the reuse potential of a dredged marine clay sample treated with induced solidification using binders like cement and coal ash. A series of geo-parametric measurements were performed on the material, including the physical and chemical properties as well as the relevant mechanical responses, i.e., strength and compressibility. The dredged sample was prepared in dry powder form and remoulded with an optimum water content to produce the base soil for solidification. This was necessary to ensure consistency of the water content in the soil for the various batches of specimens prepared for the different tests. It was found that the fundamental characteristics of the material could be effectively improved with the addition of small dosages of binders, as demonstrated by the filling of voids and aggregates formation in the solidified soil. The mechanical properties were also found to improve with prolonged rest period, where over 100 % strength increment and 60 % compressibility reduction were observed after 28 days. Binder-wise, the coal ash was less potent when used on its own and appeared to require activation by the cement for solidification to take place. Indeed, the blend of (3 % cement ? 7 % fly ash) and (5 % cement ? 5 % fly ash) produced the most significant strength and compressibility improvement, respectively. In short, corresponding results from the various tests conducted provided a better understanding of the solidification mechanism in the dredged marine clay sample for potential implementation on site.

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Section: Effect Of Curing Time On Solidificationmentioning

confidence: 96%

Geo-parametric study of dredged marine clay with solidification for potential reuse as good engineering soil

Chan

2016

Environ Earth Sci

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“…The cement-solidified DMS shows a significant improvement in its mechanical properties similarly to cement-solidified clay [4]. Solidification technique towards DMS will enhance its mechanical properties such as strength, compressibility and permeability.…”

Section: Introductionmentioning

confidence: 99%

“…In land reclamation technology, the reclaimed structure is made up of slurry like cement-stabilized soil and the strength are much lower than traditional cement-treated soil [6]. The strength of treated material is inversely proportional to the w/c ratio [4]. Chan [2] emphasized that w/c ratio is an important factor to determine the soil's ultimate strength and stiffness.…”

Section: Introductionmentioning

confidence: 99%

“…These works are crucial in keeping harbors and waterways navigable, preventing flood of river and restoring the ecosystem of degenerative water bodies [3]. The DMS from dredging works are often disposed by dumped in the sea or stored at on land disposal sites [4]. The disposal of it indicates a high demand on new ocean and land disposal sites [5].…”

Section: Introductionmentioning

confidence: 99%

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Undrained Shear Strength of Low Dosage Cement-Solidified Dredged Marine Soils (Dms) for Reclamation Works

Nordin¹

2017

GEOMATE

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ABSTRACT:The disposal of dredged marine soils (DMS) into the ocean or on land are unsatisfactory in managing its large quantity which indicates a high demand on new ocean and land disposal. DMS are classified as contaminated waste that contain of organic matter and heavy metals. Contaminated DMS can harm aquatic organism, animals and human. It must be disposed safely to ensure the contaminants are not released. By reusing the DMS as geomaterial or fill for reclamation works, it will minimize the impact to environment. The treatment techniques towards DMS are an essential and necessary in enhancing its engineering properties and assuring the effectiveness for a long-term solution. This paper presents a preliminary study in solidifying the Kuala Perlis DMS (3.4 LL) with lowest dosage of cement (1 -10 %) at different curing period (3, 7, 14 and 28 days). It shows the undrained shear strength (cu) value of cement-solidified were increased compare to the raw DMS. The results for cement dosage above 7 % shows a good improvement in cu value and the strength development were found increased after 3 days of curing. It was explained that the lowest water-cement (w/c) ratio tend to have a higher cu value of the cement-solidified DMS.

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“…Xu (2013) [6] reported that more than 14 billion m 3 per year soil martials are dredged from main rivers and commercial ports in China by 2015. Most of the dredged material is simply dumped in the sea or stored on land disposal sites [7][8] . Hence, to make the abandoned material useful for engineering construction, the stabilization-solidification method via cementing agents is often introduced to improve the mechanical behavior of dredged material.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Mechanical Behavior of High Water Content Dredged Materials Stabilized by Cement and Super-absorb Polymer

Bian¹,

Wang²

2016

Proceedings of the 2016 2nd International Conference on Architectural, Civil and Hydraulics Engineering (ICACHE 2016)

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Abstract.A series of unconfined compression strength test and odeometer test were conducted to study the mechanical behavior of cement stabilized dredged material at high water content with super-absorb polymer. The super-absorbent polymer (SAP) is added as water reducing agent into the cementing agent to improve the effectiveness of cementation for high water content dredged material. Test results show that the unconfined compressive strength (qu) increases with increasing SAP content, the strength increase is about 2.4 times when SAP content is of 10‰. For certain cement content, the compression curve of cement stabilized clay with higher SAP content lies blow that of lower ones, as a result, the vertical yield stress (σvy) increase with the SAP content.

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Geotechnical properties of dredged marine sediments treated at high water/cement ratio

Cited by 45 publications

References 11 publications

Geo-parametric study of dredged marine clay with solidification for potential reuse as good engineering soil

Geo-parametric study of dredged marine clay with solidification for potential reuse as good engineering soil

Undrained Shear Strength of Low Dosage Cement-Solidified Dredged Marine Soils (Dms) for Reclamation Works

Experimental Study on the Mechanical Behavior of High Water Content Dredged Materials Stabilized by Cement and Super-absorb Polymer

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