Time of reactions in a lime treated clayey soil and influence of curing conditions on its microstructure and behaviour

Sante, Marta Di; Fratalocchi, Evelina; Mazzieri, Francesco; Pasqualini, Erio

doi:10.1016/j.clay.2014.06.018

Cited by 95 publications

(30 citation statements)

References 8 publications

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“…The microstructure also appears to have more cementitious connectors resulting in well-developed floccules. Sante, Fratalocchi, Mazzieri, & Pasqualini (2014) also reported the formation such floccules in lime stabilized soil. The stabilized soil matrix also exhibits very little voids which may be due to the deposition of cementitious products resulting in a denser microstructure.…”

Section: Mineralogy Of CD Admixed Lime Soil Stabilizationmentioning

confidence: 95%

Strength and microstructure of micro ceramic dust admixed lime stabilized soil

James¹,

Pandian²

2018

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The use of micro ceramic dust (CD) as an additive to lime in soil stabilization has been analysed in this study. CD was obtained by crushing and sieving of waste ceramic tiles from construction debris. The initial consumption of lime (ICL) for soil modification was determined using Eades and Grim pH test. In order to study the effect of lime content on soil stabilization, three different lime contents (below ICL, ICL and above ICL) were used for stabilizing the soil. These three lime contents were amended with various amounts of CD to study its effect on the strength of the stabilized soil. Unconfined compression strength (UCS) tests were carried out on the stabilized soil specimens of dimensions 38mm x 76mm at different ages of curing. The spent UCS samples were crushed and sieved to carry out Atterberg limits and free swell tests followed by x-ray diffraction (XRD) and scanning electron microscopy (SEM) tests for determining changes in microstructure. The results indicated that the addition of CD resulted in a marginally negative influence on the early strength of the stabilized soil at three days of curing whereas it enhanced the delayed strength of the soil at 28 days of curing, gaining between 12-14% strength. The effect of CD on the plasticity and swell-shrink of lime stabilized soil indicated a further reduction in plasticity and swell-shrink nature. The mineralogy of the amended soil revealed the formation of CSH and CAH minerals responsible for strength gain. SEM images used to analyse the microstructure of the virgin and stabilized soil, indicated the formation of a dense and compact microstructure. Finally, it was concluded that CD can be adopted as an auxiliary additive to lime in stabilization of expansive soil with provision of sufficient curing and the delayed onset of early strength due to CD can be overcome by using higher lime content in stabilization.Key words: Expansive soil, lime stabilization, ceramic dust, strength, mineralogy, microstructure Resumen El uso de polvo de cerámica micro (CD) como un aditivo a la cal en la estabilización del suelo se ha analizado en este estudio. El CD se obtuvo triturando y tamizando las baldosas cerámicas de desecho de los desechos de la construcción. El consumo inicial de cal (ICL) para la modificación del suelo se determinó usando Eades y Grim pH test. Con el fin de estudiar el efecto del contenido de cal sobre la estabilización del suelo, se utilizaron tres contenidos diferentes de cal (por debajo de ICL, ICL y superior ICL) para estabilizar el suelo. Estos tres contenidos de cal fueron modificados con varias cantidades de CD para estudiar su efecto sobre la resistencia del suelo estabilizado. Se realizaron pruebas de resistencia a la compresión no confinada (UCS) en las muestras de suelo estabilizado de dimensiones 38 mm x 76 mm a diferentes edades de curado. Las muestras de UCS gastadas se trituraron y se tamizaron para llevar a cabo los límites de Atterberg y las pruebas de hinchamiento libre seguidas por difracción de rayos X (XRD) y microscop...

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Section: Mineralogy Of CD Admixed Lime Soil Stabilizationmentioning

confidence: 95%

Strength and microstructure of micro ceramic dust admixed lime stabilized soil

James¹,

Pandian²

2018

rdlc

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“…Cation exchange appears to be the first step towards more permanent changes; following a modification of the electrolyte content in the water due to the increased exchangeable calcium ion concentration, flocculation and agglomeration of the soil particles occur, transforming the plastic soil to a more granular and less plastic material [7]. As a result of this reaction, the soil generally acquires an aggregated, more porous and less deformable structure [14,29]. In the context of SWRC studies, this would be expected to affect water retention especially in the zone where capillary phenomena predominate; (b) long-term pozzolanic reactions depending on the availability of additional lime (beyond the amount used for immediate reactions); these are reactions between lime, silica and alumina, producing cementing agents.…”

Section: Introductionmentioning

confidence: 99%

A study of the water retention curve of lime-treated London Clay

2016

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This paper investigates the drying and wetting soil water retention curves (SWRCs) of statically compacted lime-stabilised London Clay specimens. A series of tests were performed using the contact filter paper method, pressure plate apparatus and a suction-controlled triaxial system incorporating the axis translation technique. These investigated the water retention of the soil under different boundary and stress-state conditions and simultaneously determined the volume change in the soil during drying and wetting. Factors relevant to the lime treatment of soils, such as curing period and method (air vs. water curing), were also considered. Finally, the hysteresis of the SWRC of the chemically treated soil (for which there appears to be a lack of information in the international literature) was investigated. The results showed that the treatment with lime increased the volumetric stability but reduced the water retention ability due to a more open structure enabled by the flocculation and chemical bonding effects. Curing period and method effect appears to be small. Hysteresis was noted to some degree in all instances.

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“…In addition, significant reduction in compressibility for lime-treated samples was also reported in previous studies (Nalbantoglu and Tuncer, 2001;Di sante et al, 2014;Makki-Szymkiewicz et al, 2015;Jha and Sivapullaiah, 2016). However, less attention has been paid to the effect of aggregate size on the compressibility of lime-treated soils.…”

Section: Introductionmentioning

confidence: 65%