Effects of Nano-Carbon Reinforcement on the Swelling and Shrinkage Behaviour of Soil

Taha, Mohd Raihan; Alsharef, Jamal M.A.; Al-Mansob, Ramez A.; Khan, Tanveer Ahmed

doi:10.17576/jsm-2018-4701-23

Cited by 14 publications

(3 citation statements)

References 36 publications

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“…The potential for the NCs to intimately interact with the clay phases and affect the microstructure of the soil mixture after the sonication action, can be used to effectively stabilize and restrain the dispersion of CNFs in soil composite. With using this method to mixed soil with NCs it can be even improve the physical and mechanical properties of soil [25][26][27][28][29]. This finding also agrees with the hypotheses of Yazdanbakhsh and Grasley [18], Sanchez and Ince [30] who used silica fume particles (< 1 µm) to act as wedges between the CNFs thus physically keeping the particles far enough apart to render inter-fiber attractive forces ineffective.…”

Section: Morphologysupporting

confidence: 77%

Ultrasonic Dispersion of Nanocarbons in Soil-water Mixture

Taha

Alsharef

Khan³

et al. 2019

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Nanocarbons (NCs) are a novel reinforcing material used to improve the mechanical properties of composite materials. As an application of this technology, research has been considering how nanocarbons can been used in soil reinforcement. However, to take advantage of the excellent reinforcing capabilities of nanocarbon tubes (CNTs) and nanocarbon fibers (CNFs), it is necessary to achieve a uniform distribution of nanocarbons in the composites. This paper presents a novel method for improving the dispersion of CNTs and CNFs in soil. The approach incorporates soil itself to stabilize the distribution of CNTs and CNFs. To examine the effectiveness of the method, specimens of soil with CNTs and CNFs were prepared with different concentrations of water. The specimens were then sonicated with ultrasonic equipment and imaged by field-emission scanning electron microscopy (FSEM) and transmission electron microscopy (TEM). The results showed that soil containing sufficient proportions of micro-particles (clay) can itself largely prevent the reagglomeration of NCs in the soil, thereby stabilizing their dispersion.

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Section: Morphologysupporting

confidence: 77%

Ultrasonic Dispersion of Nanocarbons in Soil-water Mixture

Taha

Alsharef

Khan³

et al. 2019

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“…This is compared with fiber reinforcement addition to soil which also reduced soil cracks but increased hydraulic conductivity. It is suggested by Taha et al [30] that the better dispersion of the CNT additives would provide the potential to overcome these desiccation cracks in soil associated when using fiber reinforcement and binder.…”

Section: Carbon Nanotubes (Cnt)mentioning

confidence: 99%

“…The present high expense of carbon nanotubes may have a deterring effect from the application in this field [21]. In addition, challenges faced with consistent dispersion of the CNT needs to be overcome when applied to soil stabilization [30]. Correia and Rasteiro [31] reported adding a surfactant to the blended solution of MWCNT/ OPC in improving the dispersion and achieving higher UCS and Youngs Modulus (E).…”

Section: Carbon Nanotubes (Cnt)mentioning

confidence: 99%

Fibers, Geopolymers, Nano and Alkali-Activated Materials for Deep Soil Mix Binders

2020

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Ordinary Portland Cement (OPC) and Lime (CaO) have traditionally been used as binder materials for Deep Soil Mix (DSM) ground improvement. Research has been conducted into possible alternatives such as pozzolans to reduce reliance on either cement or lime. However, pozzolans still undergo similar calcium-based reactions in the strengthening process. In this review, further alternative binder materials for soil strength development are explored. These recent developments include fiber reinforcement materials, alkali activation methods, nanomaterials and geopolymers, which can potentially achieve equal or improved performance. Research to date has shown that alkali-activated materials and geopolymers can be equivalent or superior alternatives to pozzolanic supplemented cement binders. The case is made for GP cements which potentially produces 80% less CO2 than conventional portland cement during manufacture. One-part AAM and GP cements are a promising substitute for portland cement in DSM. A combined approach which incorporates both Ca and alkali activated/geopolymer types of materials and hence reactions is proposed.

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