A review of the stabilization of tropical lowland peats

Zulkifley, Mohamad Tarmizi Mohamad; Ng, Tham Fatt; Raj, John Kuna; Hashim, Roslan; Bakar, Ahmad Farid Abu; Paramanthan, S.; Ashraf, Muhammad Aqeel

doi:10.1007/s10064-013-0549-5

Cited by 28 publications

(15 citation statements)

References 6 publications

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“…Class F fly ash is not used as often because it requires an activator, either lime or cement, to form pozzolanic stabilized mixtures (PSMs) since it is not a self-cementing material [53,54]. Zulkifley et al [55] assessed the effect of offspecification fly ash on the engineering properties of tropical soils from Hawaii. They observed that the fly ash reduced the liquid limit and plasticity index, and enhanced the California bearing ratio (CBR) and unconfined compressive strength.…”

Section: Stabilization Using Fly Ashmentioning

confidence: 99%

Fundamentals of soil stabilization

2017

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Section: Stabilization Using Fly Ashmentioning

confidence: 99%

Fundamentals of soil stabilization

2017

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“…Estabragh et al (2013) pointed out that, based on the total and effective stresses, the increase in the content of nylon fiber leads to an increase in shear strength parameters of clay. Zulkifley et al (2013) believed that the addition of cement and sodium bentonite results in significant *Corresponding author. Tel: +98 9166724282.…”

Section: Introductionmentioning

confidence: 99%

Strength properties of soft clay treated with mixture of nano-SiO2 and recycled polyester fiber

Changizi

Haddad

2015

Journal of Rock Mechanics and Geotechnical Engineering

138

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Please cite this article as: Changizi F, Haddad A, Strength properties of soft clay treated with mixture of nano-SiO 2 and recycled polyester fiber, Abstract: This paper investigates the effect of recycled polyester fiber, produced from polyethylene (PET) bottles, in combination with nano-SiO2 as a new stabilizer to improve the mechanical properties of soils. We intend to study the effect of adding nano-SiO2 and recycled polyester fiber on soil engineering properties, especially the shear strength and unconfined compressive strength (UCS), using clayey soil with low liquid limit. Three different combinations of fiber-soil ratios ranging between 0.1% and 0.5% as well as three different combinations of nano-soil ratios ranging between 0.5% and 1% are used. The shear strength and UCS of treated specimens are obtained from direct shear test and unconfined compression test, respectively. Results of this study show that the addition of recycled polyester fiber and nano-SiO2 increases the strength of soil specimens. Both the shear strength and UCS are improved by increasing the contents of recycled polyester fiber and nano-SiO2 in the soil mixture. The increase in the nano-SiO2 content leads to a reduction in failure strain, but the increase in the content of recycled polyester fiber leads to an increase in failure strain. The increase in the contents of recycled polyester fiber and nano-SiO2 leads to an increase in elastic modulus of soils. Based on the test results, the addition of recycled polyester fiber improves the mechanical properties of soils stabilized with nano-SiO2 as well as the recycled polyester fiber has a positive effect on soil behaviors.

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“…After absorption, SAP strength was also lower than both the soil and ice skeleton at negative temperatures; this means that the compression coefficient of samples treated with SAP is larger those either without cement or additives. Thaw strain was also decreased by SAP water retention and so the addition of cement to soils has three effects: (1) the cement reacts with unfrozen water within soils at −1 °C such that hydration products wrapped and filled particle pores, and the bracing effect of products decreased compression strain; (2) Ca 2+ , Na + , and K + cation exchange dissociated from calcium hydroxide in cements and soils to thin the electrical surface double layer and lower particle dispersity leading to higher aggregation, and; (3) Ca(OH) 2 from the hydration of cement participated in a pozzolanic reaction with SiO 2 and Al 2 O 3 from clay minerals and generated CSH and hydrated calcium aluminate [26]. The main hydration processes in soil samples, therefore, include the fact that tricalcium silicate (C 3 S) and dicalcium silicate (C 2 S) in cement will generate tobermorite (CSH) with water (Equations (2) and (3)), while C 3 S and gypsum generate ettringite (AFt) (Equation (4)) [27].…”

Section: Discussionmentioning

confidence: 99%

Improvement of Compressibility and Thaw-Settlement Properties of Warm and Ice-Rich Frozen Soil with Cement and Additives

Chai

Zhang

2019

Materials

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The warm and ice-rich frozen soil (WIRFS) that underlies roadway embankments in permafrost regions exhibit large compression and thaw deformation, which can trigger a series of distresses. Cement and additives were used in this study to improve the compressibility and thaw-settlement properties of WIRFS. We, therefore, selected optimum additives and studied the improvement effect on the frozen soil with 30% water content based on our previous research. Given constant load and variable temperatures, compression coefficients, thaw strains, and water content changes were obtained at temperatures of −1.0 °C, −0.5 °C, and 2.0 °C to evaluate the effect of improvements. A scanning electron microscope (SEM) was then used to observe the microstructure of improved soils and analyze causal mechanisms. Data show that hydration reactions, physical absorptions, cement, and additives formed new structures and changed the phase of water in frozen soil after curing at −1.0 °C for 28 days. This new structure, cemented with soil particles, unfrozen water, and ice, filled in the voids of frozen soil and effectively decreased the WIRFS compression coefficient and thaw strain.

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A review of the stabilization of tropical lowland peats

Cited by 28 publications

References 6 publications

Fundamentals of soil stabilization

Fundamentals of soil stabilization

Strength properties of soft clay treated with mixture of nano-SiO2 and recycled polyester fiber

Improvement of Compressibility and Thaw-Settlement Properties of Warm and Ice-Rich Frozen Soil with Cement and Additives

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