An approach for modelling spatial variability in permeability of cement-admixed soil

Kek, Hardy Yide; Pan, Yutao; Ng, Yannick Choy Hing; Lee, Fook Hou

doi:10.1007/s11440-021-01344-0

Cited by 3 publications

(2 citation statements)

References 55 publications

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“…The postcuring void ratio was generally not reported. Moreover, refs [36,37] proposed a method for estimating the post-curing unit weight and void ratio of cement-treated soil, but this only applies to the hydration reaction of OPC. Based on the [36,37] model, the void ratio may decrease by up to about 15% during curing.…”

Section: Void Ratio As a Possible Characterising Parametermentioning

confidence: 99%

“…Moreover, refs [36,37] proposed a method for estimating the post-curing unit weight and void ratio of cement-treated soil, but this only applies to the hydration reaction of OPC. Based on the [36,37] model, the void ratio may decrease by up to about 15% during curing. This implies that the void ratio at the point of mixing is not equal to, but may serve as, a reasonable first approximation of the post-curing void ratio.…”

Section: Void Ratio As a Possible Characterising Parametermentioning

confidence: 99%

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Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Lim

Goh

et al. 2021

Geotechnics

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Although there has been a substantial body of research on the chemical stabilization of sewage sludge, most of these results are project-specific and relate mainly to the use of new binders and sewage sludge from specific sources. In this sense, much of the work to date is context-specific. At present, there is still no general framework for estimating the strength of the chemically treated sludge. This paper proposes one such general framework, based on data from some recent studies. An in-depth re-interpretation of the data is first conducted, leading to the observation that sludge, which has coarse, hard particulate inclusions, such as sand, premixed into it, gives significantly higher strength. This was attributed to the hard coarse particles that lower the void ratio of treated soil, are much less susceptible to volume collapse under pressure, and contribute to the strength through frictional contacts and interlocking. This motivates the postulation of a general framework, based on the premise that coarse, hard particulate inclusions in the sludge which do not react with the binders can nonetheless contribute to the strength of the treated soil. The overall void ratio, defined as the volume of voids in the cementitious matrix normalised by the overall volume, is proposed as a parameter for quantifying the combined effect of the coarse particulate inclusions and the cementitious matrix. The binder-sludge ratio is another parameter which quantifies the strength of the cementitious matrix, excluding the hard particulate inclusions. Back-analysis of the data suggests that the significance of the binder-sludge ratio may diminish as the content of hard particulate inclusions increases.

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Section: Void Ratio As a Possible Characterising Parametermentioning

confidence: 99%

Section: Void Ratio As a Possible Characterising Parametermentioning

confidence: 99%

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Lim

Goh

et al. 2021

Geotechnics

Self Cite

View full text Add to dashboard Cite

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Physical, mechanical, and microstructural characteristics of fly ash replaced cement deep mixing columns

Yenginar,

Olgun

2024

Bull Eng Geol Environ

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The novel approach of the study is implementing the installation procedure of fly ash (FA) replaced cement deep mixing (DM) columns to field cases aiming at managing FA waste and reducing cement utilization. FA replaced cement DM columns (diameter of 30 cm and length of 80 cm) were installed on clayey soils using a laboratory type DM machine. The effect of installation parameters such as the binder dosage, FA replacement ratio, superplasticizer content, water/binder ratio, and the liquidity index (LI) of the soil on column performance was investigated. The design of experiments and optimization process were conducted using the Taguchi method, S/N and ANOVA analyses, and the desirability function method. Observations have shown that the mixing time required for a homogeneously mixed column depends on the LI of the soil and the volume ratio (VR) of the slurry. A key parameter (LI∙VR) is defined to decide the minimum number of the mixing process. The blade rotation number should be minimum of 252 rev/m to obtain a homogeneous soil-slurry mixture. The highest strength of the column was obtained when LI of fresh soilcrete (LImix) is 1.25∙LI. Optimum installation parameters were determined as binder dosage of 425 kg/m3, FA replacement ratio is 40%, superplasticizer content is 3%, water/binder ratio is 0.8, and LI of the untreated soil is 1. In the optimum design, the mixing efficiency of the soil-slurry mixture increased and the best column performance was obtained. In addition, cement utilization and binder cost decrease 40% and 33%, respectively, in FA-replaced cement DM columns. SEM images prove the increase in column performance due to the cementation products (CSH and CAH gels) formed in the microstructure of the column.

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Strength, Permeability, and Microstructure of Cement Treated Dredging Sand

Luong

Tran-Nguyen

2023

Geotech Geol Eng

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An approach for modelling spatial variability in permeability of cement-admixed soil

Cited by 3 publications

References 55 publications

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Physical, mechanical, and microstructural characteristics of fly ash replaced cement deep mixing columns

Strength, Permeability, and Microstructure of Cement Treated Dredging Sand

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