Strength and Modulus of Marine Clay-Cement Mixes

Lee, Fook Hou; Lee, Yeong Yeh; Chew, Sek-Jin; Yong, Kylie Su Mei

doi:10.1061/(asce)1090-0241(2005)131:2(178)

Cited by 264 publications

(70 citation statements)

References 5 publications

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“…In a similar way, significant non-uniformities can result from chemical improvement using cement slurry (e.g. Lee et al 2005Lee et al , 2006Lee et al , 2008. Chen et al (2011) also reported that the unconfined compressive strength (UCS) of core samples varies from about 700 kPa to about 5 MPa for the deep mixing work at the Marina Bay Financial Centre (MBFC) project in Singapore.…”

Section: Introductionmentioning

confidence: 94%

Some issues in core strength measurement in cement-soil treatment for deep excavation - Field data study

Liu

Jiang

Lee

2016

JGS Special Publication

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Deep mixing and jet grouting with cement are widely used to improve soft clayey soils as part of stability intervention in deep excavation and tunnelling. The quality of the improvement is often evaluated by measuring the strength of cored samples after the installation of deep mixing or jet grout columns. Although the spatial variability in the strength of cement-treated soil in such operations has been reported, this variability, as well as its influence on design and construction control, has still not been well-characterized. Using data from two field cases, this paper examines two issues associated with strength measurement and its usage in design. The two field cases are the ground treatment works for Marine Bay Financial Centre and the Marina One projects, which lie in the same locality, overlying thick layers of soft marine clay. The first issue examined is the time interval between ground treatment and core testing. The effect of this parameter on the measured strength and its implications on ground treatment construction control are discussed. The second issue relates to the specification of design strength, which takes into account the strength variability of the ground. The robustness of several criteria with respect to sample sizes is examined using the data from these sites, leading to recommendations for design strength and control measures.

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Section: Introductionmentioning

confidence: 94%

Some issues in core strength measurement in cement-soil treatment for deep excavation - Field data study

Liu

Jiang

Lee

2016

JGS Special Publication

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“…It is known that the improvement of the soil with cement treatment is referred to as the chemical reactions between cement and the soil particles, and the water-cement ratio has an important influence on the mechanical properties of cement-treated soil. Once the water-cement ratio exceeds the optimum level, the strength of cement-treated soil obviously decreases with the increasing water-cement ratio [27,28]. It is worth noting that, in practical engineering, the initial water content of the natural clay undoubtedly increases the water-cement ratio of the cement-treated soil.…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

Wang

et al. 2018

Advances in Civil Engineering

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Precast concrete (PC) piles with cement-improved soil surrounds have been widely used for soft ground improvement. However, very few calculation approaches have been proposed to predict the lateral bearing capacity. is study aims at investigating the lateral capacity of a single PC pile reinforced with cement-improved soil through a series of 3D finite element analyses and theoretical studies. It is revealed that application of cement-improved soil around the PC pile can obviously reduce the induced lateral deflections and bending moments in the pile and can significantly increase its capacity to resist lateral loading. To account for the reinforcement effect of cement-treated soil, a modified m approach is proposed by introducing a modified coefficient to enable the predictions of the lateral bearing capacity for such reinforced PC piles. It is revealed that the modified coefficient is approximately linearly related to the compressive bearing capacity of improved soil surrounds.

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“…The correlation between strength and stiŠness for cement-mixed soil possessing relatively high levels of strength has already been studied by many researchers (Terashi et al, 1983;Lee et al, 2005;Flores et al, 2010). In this chapter, the authors will examine how to change the behavior of CTS according to diŠerent mixtures of water and cement contents and also soil properties, mainly focusing on strength and stiŠness during the initial stages of curing or a lower strength range.…”

Section: Strength and Stiffness Relationshipmentioning

confidence: 99%

Properties of Cement-Treated Soils During Initial Curing Stages

Seng

Tanaka

2011

Soils and Foundations

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The engineering properties of cement-treated soils manufactured by the so-called``Pipe Mixing Method'' and`S uper GeoMaterial (SGM) Method'' were studied. In these methods, clayey soils with high water contents are mixed with cement and used asˆll material. Since the cement-mixed soils are transported through a pipeline, whose length at times exceeds 2 km, the properties of the treated soil during the initial stages of the hardening process are important. Bender element, vane shear and fall cone tests were performed to obtain such engineering properties as the shear modulus and the shear strength. The study revealed the following: 1) The minimum shear wave velocity of treated soils is detectable at around 2.8 m/s, corresponding to a shear modulus of about 12 kPa. 2) A linear correlation between the shear modulus and the shear strength exists even in the very early stages of curing, approximately G＝300 s, where G and s are the shear modulus and the shear strength, respectively. This relation is similar to that for natural clays. 3) Thè`s etting time'' observed for concrete is also apparent in cement-treated soil materials. 4) Fall cone tests comprise a useful and simple technique for measuring very low levels of shear strength.

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Strength and Modulus of Marine Clay-Cement Mixes

Cited by 264 publications

References 5 publications

Some issues in core strength measurement in cement-soil treatment for deep excavation - Field data study

Some issues in core strength measurement in cement-soil treatment for deep excavation - Field data study

Calculation Approach for Lateral Bearing Capacity of Single Precast Concrete Piles with Improved Soil Surrounds

Properties of Cement-Treated Soils During Initial Curing Stages

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