Multifunctional properties of carbon nanotube/fly ash geopolymeric nanocomposites

Saafi, Mohamed; Andrew, Kelly; Tang, Pik Leung; McGhon, David; Taylor, S.S.; Rahman, Mohamad Faizal Abd; Yang, Shangtong; Zhou, Xiangming

doi:10.1016/j.conbuildmat.2013.08.007

Cited by 200 publications

(92 citation statements)

References 17 publications

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“…Further improvement of the mechanical properties of the examined mixes could be achieved by the addition of silica fume, fibres or nanoparticles [50]. Fig.…”

Section: Hardened Geopolymer Mortar Characteristicsmentioning

confidence: 99%

Development of geopolymer mortar under ambient temperature for in situ applications

Al-Majidi

Λαμπρόπουλος

Cundy

et al. 2016

Construction and Building Materials

273

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Geopolymer concrete technology involves production of more environmentally friendly waste material-based concrete which could be a viable solution for conventional concrete replacement. Typical fly ash-based geopolymer concrete however requires high temperature curing treatment in order to develop sufficient early strength properties, which is considered a severe limitation for cast-in-place concrete applications. Most previous studies on geopolymer concrete have focused on the properties of concretes pre-hardened by heat curing and/ or by aggressive chemical treatment (e.g. alkali activation using concentrated sodium hydroxide (NaOH)). The current study presents an extensive experimental investigation on the mechanical and microstructural properties of geopolymer concrete mixes prepared with a combination of fly ash and slag cured under ambient temperature. 'User friendly' geopolymer mixes were produced using fly ash (FA) and Ground Granulated Blast furnace Slag (GGBS) mixed together with potassium silicate with molar ratio equal to 1.2 (as the activator) and water. The results indicated that heat curing treatment can be avoided by partial replacement of fly ash with slag. The compressive strength of the examined mixes was found to be in the range of 40-50MPa for 40 % and 50 % GGBS replacement mixtures respectively. Moreover, the flexural and direct tensile strengths of geopolymer mixes are considerably improved as the GGBS content is increased.Based on FTIR and SEM/EDS analysis, the inclusion of a higher content of GGBS resulted in a denser structure by formation of more hydration products.Keywords: Fly ash, slag, ambient temperature, user friendly geopolymer mortar *Manuscript Click here to view linked References 2 IntroductionThere are many environmental issues associated with the production of Ordinary Portland cement (OPC), such as consumption of 5% of natural resources, and generation of 5-7 % of total global anthropogenic carbon dioxide emissions [1][2][3][4]. This has led to an urgent need for the development of alternative materials that may provide technically viable alternative solutions to conventional cementitious concrete, with more favourable environmental credentials. Geopolymer concrete manufacture is one of the most promising techniques which has been developed in the last few years. Utilization of geopolymer materials can reduce 80% of greenhouse gas emissions associated with material production, and overcome issues related to cement production and unregulated disposal of industrial materials by recycling these materials in geopolymer manufacture [5][6][7].Geopolymers are inorganic by-product materials, rich in silicon (Si) and aluminium Five different mixtures of geopolymer mortar proportions were examined with various ratios of GGBS to total binder (10%, 20%, 30%, 40% and 50 %, Table 2). Based on preliminary experimental studies undertaken during the current project, the optimum mix design (in terms of mechanical strength and workability) was achieved using water, alkaline activator...

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“…Further improvement of the mechanical properties of the examined mixes could be achieved by the addition of silica fume, fibres or nanoparticles [50]. Fig.…”

Section: Hardened Geopolymer Mortar Characteristicsmentioning

confidence: 99%

Development of geopolymer mortar under ambient temperature for in situ applications

Al-Majidi

Λαμπρόπουλος

Cundy

et al. 2016

Construction and Building Materials

273

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“…Commonly, a low filler concentration, large filler size and low aspect ratio, hydrophilic filler surface, high surfactant concentration, and high water-to-cement ratio are beneficial for enhancing the mixing/dispersing effectiveness of functional fillers in concrete [2,23,[36][37][38][39]. For example, Saafi et al studied the effect of carbon nanotube concentration on their dispersion in concrete.…”

Section: The Macro Electrical Resistance Measurement Methodsmentioning

confidence: 99%

“…13(a) and (b)) and were poorly distributed and severely agglomerated within the matrix at 1 wt.% of carbon nanotube concentration (as shown inFigure 3.13(c))[36].Han et al used sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (NaDDBS) as surfactants to improve the dispersion of multi-walled…”

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confidence: 97%

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Processing of Self-Sensing Concrete

Han

2014

Self-Sensing Concrete in Smart Structures

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“…The curing process of geopolymer known as polymerization where the aluminosilicate oxides react with the alkali polysilicates to form a 3-dimensional polymeric Si-O-Al amorphous microstructure [13,14]. Geopolymers are currently being considered as a replacement to ordinary Portland cement (OPC) and has received considerable attention for their cost efficiency, chemical stability, corrosion resistance, rapid strength gain rate, low shrinkage and freeze-thaw resistance [15,16].…”

Section: Introductionmentioning

confidence: 99%

Characterization of alkali activated geopolymer mortar doped with MWCNT

Khater¹,

Abdel‐Gawwad²

2015

Epitoanyag - JSBCM

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this paper aimed to investigate the effect of multi-walled carbon nanotubes (mWcnt) on properties of slag geopolymeric mortar. Geopolymeric matrices containing different mWcnts concentrations (0.0, 0.1, 0.2, 0.3 and 0.4 % by weight of the used binder) were synthesized. the geopolymer mortar composed of aluminosilicate slag to sand (1:2), while the aluminosilicate source binder composed of 50% air cooled slag and 50% water cooled slag both passing a sieve of 90 µm, while the sand passing a sieve of 1 mm. the materials prepared at water/binder ratios in a range of 0.34-0.39% depending on the added mWcnt, whereas the Glenium Ace-30 superplasticizer used in the ratio of 1.4-2.2% from the total dry weight for better dispersion of mWcnt under sonication for 15 min. Alkaline activation of the geopolymer mortar was carried by using of 6% naoH. curing was performed under temperature of 40°c and 100% relative humidity. results showed that the addition of mWcnts enhanced the resulting amorphous geopolymer structure with marked decrease in the drying shrinkage as well as water absorption specially when using 0.1% mWcnt, while further increase in mWcnts results in agglomeration in mWcnt within the matrix and so hinder the propagation of geopolymerization reaction and negatively affect the formed geopolymer structure.

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Multifunctional properties of carbon nanotube/fly ash geopolymeric nanocomposites

Cited by 200 publications

References 17 publications

Development of geopolymer mortar under ambient temperature for in situ applications

Development of geopolymer mortar under ambient temperature for in situ applications

Processing of Self-Sensing Concrete

Characterization of alkali activated geopolymer mortar doped with MWCNT

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