Mechanical properties soil stabilized with nano calcium carbonate and reinforced with carpet waste fibers

Choobbasti, Asskar Janalizadeh; Samakoosh, Mostafa Amozadeh; Kutanaei, Saman Soleimani

doi:10.1016/j.conbuildmat.2019.03.306

Cited by 126 publications

(35 citation statements)

References 49 publications

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“…The residual strength of the sample is mainly related to the sliding friction of the particles on the shear surface, so the increase of external pressure will lead to the same arrangement between the particles of the hydration products formed in the curing process. This is similar to findings in other types of geotechnical materials (Choobbasti et al 2019;Al-Bared et al 2019). Different degrees of strain softening ( Van et al 1997;Long et al 2017) occur in the stabilized tailings samples with different Cw and curing periods under direct shear conditions.…”

Section: Influence Of Caams Content On Shear Stress-displacement Responsessupporting

confidence: 91%

Study on Mechanical Characteristics of Composite Alkali-activated Materials-stabilized Gold Tailings Under Direct Shear

Pan

Zhang

et al. 2021

Preprint

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In this study, the traditional industrial waste residue and some alkaline activators were mixed to prepare a new composite alkali-activated materials (CAAMs), which was used to stabilize gold mine tailings (GMTs). Due to emissions of greenhouse gases and solid dust, alkali-activated materials have been widely used to replace Portland cement to solidify geotechnical materials to enhance their mechanical properties. Different admixture of CAAMs (i.e., 0, 3, 5, 8% ) and gold mine tailings were prepared, and the samples were cured in saturated water and under no air conditions. In order to investigate the mechanical characteristics of CAAMs-stabilized GMTs, laboratory direct shear tests were carried out on samples after curing them for 3, 7, 14 and 28 days, respectively. The test results showed that as the curing periods increased, the brittleness of the samples increased, and the stress-displacement curves for all the cured specimens changed from plateau-type to peak-type curves. The curing periods and the content of CAAMs are both beneficial for enhancing the shear strength of CAAMs-stabilized GMTs samples, but the increase rate decreased as the vertical confining pressure increased. Furthermore, the influence of CAAMs content on shear strength increment was larger than that of curing periods. An exponential growth model could be well used to describe the change of shear strength with the curing periods at different vertical stresses.

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Section: Influence Of Caams Content On Shear Stress-displacement Responsessupporting

confidence: 91%

Study on Mechanical Characteristics of Composite Alkali-activated Materials-stabilized Gold Tailings Under Direct Shear

Pan

Zhang

et al. 2021

Preprint

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“…Owing to the development of nanotechnology, nano-materials, such as nano-silica, nanoalumina, and nano-titania, have been recognized as effective soil additives to increase the stiffness of clays and to reduce their free swelling potential [35][36][37][38][39][40]. Nano-additives with nano dimensions and high specific surface area can enter soil pore-spaces easily [41][42][43]. In contrast with cement and lime, many nano-materials require less energy for production and are generally environmentally friendly, non-toxic, and do not cause any pollution in soil and groundwater when used for soil improvement [44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

et al. 2021

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Low bearing capacity soils may pose serious construction concerns such as reduced bearing capacity and excessive hydro-associated volume changes. Proper soil remediation techniques must be planned and implemented before commencing any construction on low bearing capacity soils. Environmentally friendly soil stabilizers are gradually replacing traditional soil stabilizers with high carbon dioxide emissions such as lime and cement. This study investigated the use of an alternative pozzolanic mix of nano-additives (i.e., nano-silica and nano-alumina) and cement to reduce the usage of cement for achieving competent soil stabilization outcomes. A series of unconfined compressive strength (UCS), direct shear, and durability tests were conducted on marl specimens cured for 1, 7, and 28 days stabilized with nano-additives (0.1~1.5%), 3% cement, and combined 3% cement and nano-additives. The UCS and shear strength of stabilized marl increased with nano-additives up to a threshold nano-additive content of 1% which was further intensified with curing time. Nano-additive treated cemented marl specimens showed long durability under the water, while the cemented marl decomposed early. The microfabric inspection of stabilized marl specimens showed significant growth of calcium silicate hydrate (CSH) products within the micro fabric of nano-silica treated marl with reduced pore-spaces within aggregated particles. The results confirmed that nano-additives can replace cement partially to achieve multi-fold improvement in the strength characteristics of the marl.

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“…Lian et al 36 investigated the shear strength of loess reinforced with root by performing consolidated-undrained triaxial tests, and it was found that the increased internal cohesion contributed the most to the increase in strength of reinforced specimen. Choobbasti et al 37 investigated unconfined compressive strength test of soft clay in a construction site reinforced with nano calcium carbonate and carpet waste fibers by performing unconfined compressive strength tests and unconsolidated undrained (UU) triaxial tests. They found that the addition of nanoparticles to the clayey soil reduced its liquid limit and increased its plastic limit whereas the addition of carpet waste fibers to the clayey soil increased the residual strength significantly.…”

Section: Introductionmentioning

confidence: 99%

Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

Xue

Cheng

Wang

2021

Sci Rep

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In addition to the shearing behavior of soil, the creep character is also considered crucial in determining the long-term shear strength. This especially holds true for the loess that possesses the metastable microstructure and is prone to landslide hazards. This study explored the potential application of straw reinforcement to enhance the shearing and creep properties of the Quaternary loess. The mechanism responsible for the straw reinforcement to elevate the peak shear strength was revealed. Furthermore, three creep characters, namely attenuating creep, non-attenuating creep, and viscous flow were identified in this study. The unreinforced and reinforced specimen behaved in a different manner under identical shear stress ratio condition. The reinforced specimen was superior in limiting the particle relative movement within the shear plane than the unreinforced specimen. The chain reaction of interparticle contact loss, accompanied with excessive viscous displacement, rapid weakening of creep resistance, and eventually accelerated creep displacement, provided an evidence for the formation mechanism of slow-moving landslide. The long-term shear strength using the isochronal stress–strain relationship may be used for optimising the design of high-fill embankment works.

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Mechanical properties soil stabilized with nano calcium carbonate and reinforced with carpet waste fibers

Cited by 126 publications

References 49 publications

Study on Mechanical Characteristics of Composite Alkali-activated Materials-stabilized Gold Tailings Under Direct Shear

Study on Mechanical Characteristics of Composite Alkali-activated Materials-stabilized Gold Tailings Under Direct Shear

Effect of Nano-Additives on the Strength and Durability Characteristics of Marl

Effect of straw reinforcement on the shearing and creep behaviours of Quaternary loess

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