Multi-scale analysis of the mechanical improvement induced by lime addition on a pyroclastic soil

Guidobaldi, Giulia; Cambi, Costanza; Cecconi, Manuela; Deneele, Dimitri; Paris, Michaël; Russo, Giacomo; Vitale, Enza

doi:10.1016/j.enggeo.2017.03.012

Cited by 47 publications

(14 citation statements)

References 26 publications

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“…To improve their engineering characteristics chemical stabilisation involving the addition of a binder to the soil has been widely practiced. The commonly used stabilisers are Ordinary Portland Cement and lime whose stabilisation mechanisms have been widely reported [1][2][3][4][5][6][7]. Nevertheless, a major issue with those conventional stabilisers is a very significant environmental penalty due to high carbon dioxide emissions and energy intensive processes.…”

Section: Introductionmentioning

confidence: 99%

Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation: Physicochemical evolution

Coudert

Paris

Deneele

et al. 2019

Construction and Building Materials

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This study addresses the use of alkali activated high-calcium fly ash-based binder to improve engineering characteristics of soft clay-rich soils as an alternative to common stabilisers. The physico-chemical reaction sequence has been investigated by considering the binder alone and the binder mixed with kaolin. An insight into the reactivity evidenced that calcium-containing phases derived from high-calcium fly ash represent the reactive phases and, hence, pozzolanic activity is the dominant process. New compounds are formed, thenardite Na2SO4 and an amorphous silicate consisting of chains combined with calcium probably incorporating three-dimensional four-fold aluminium environments.

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Section: Introductionmentioning

confidence: 99%

Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation: Physicochemical evolution

Coudert

Paris

Deneele

et al. 2019

Construction and Building Materials

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“…The latter, as well as cement stabilization, allows to reuse excavated soils, otherwise regarded as waste, as a construction material leading to clear advantages from both economic and environmental points of view. Due to the increasing importance of these ground improvement techniques, the mechanical behaviour of artificially cemented coarse and fine grained soils has been widely investigated [4][5][6][7][8][9][10].…”

Section: Effects Of Cement and Foam Addition On Chemo-mechanical Behamentioning

confidence: 99%

Effects of cement and foam addition on chemo-mechanical behaviour of lightweight cemented soil (LWCS)

et al. 2019

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One of the main problems encountered in civil engineering is the management of large amounts of excavated soil, especially when the mechanical properties of this soil are not suitable for its reuse as a construction material. However, the excavated soil could represent a resource if appropriately improved. A suitable solution is the addition of cement and foam to produce lightweight cemented soils (LWCS). In this paper, an insight into the influence of foam on chemo-mineralogical and microstructural features of soil-cement-water system is presented. Time dependent mineralogical and microstructural changes have been monitored by means of X-Ray Diffraction, Thermo-gravimetric analysis and Mercury Intrusion Porosimetry. The present study shows that addition of foam does not alter the chemo-physical evolution of the soil-cement-water system. Large voids are present in the samples as footprint of air bubbles upon mixing, thus increasing porosity. Macroscopic behaviour of treated samples has been investigated by direct shear and oedometric tests. Chemo-physical evolution induced by cement addition is the major responsible for mechanical improvement showed by treated samples. Porosity of samples induced by foam addition plays a key role in the mechanical response of LWCS, inducing a transition of stress-strain behaviour from brittle and dilative to ductile and contractive as a function of increasing foam content.

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“…Alkali activated binders represent a viable, sustainable alternative to the use of ordinary stabilizing agents for soil improvement [1]. Differently from the use of lime and cement for soil improvement [2][3][4][5], experimental research about the use of alkali activated binders in soil improvement is still limited; nevertheless, recent studies highlight the relevant potential of novel binders for geotechnical purposes. Cristelo et al [6] researched the optimum fly ash -based alkaline activated binder for the improvement of soil to be used in rammed earth construction through a parametric analysis using laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

Multi-scale analysis on soil improved by alkali activated binders

2019

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In the present paper, the use of alkali activated binders to improve engineering properties of clayey soils is presented as an alternative to traditional binders such as lime or cement. An alkali-activated fly ash and its chemo-physical evolution has been monitored at increasing curing times by means of X-Ray Diffraction and Scanning Electron Microscopy. Alkali-activated binder has been mixed with soil for evaluating the improvement of its mechanical behaviour. One-dimensional compression tests on treated samples have been performed with particular reference to effects induced by binder content and curing time. Test results showed a high initial reactivity of the alkali activated systems promoting formation of new mineralogical phases responsible of the mechanical improvement of the treated soil.

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Multi-scale analysis of the mechanical improvement induced by lime addition on a pyroclastic soil

Cited by 47 publications

References 26 publications

Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation: Physicochemical evolution

Use of alkali activated high-calcium fly ash binder for kaolin clay soil stabilisation: Physicochemical evolution

Effects of cement and foam addition on chemo-mechanical behaviour of lightweight cemented soil (LWCS)

Multi-scale analysis on soil improved by alkali activated binders

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