Cement substitution by organoclay – The role of organoclay type

Kalpokaitė-Dičkuvienė, Regina; Lukošiūtė, Irena; Čėsnienė, Jūratė; Brinkienė, Kristina; Baltušnikas, Arūnas

doi:10.1016/j.cemconcomp.2015.04.021

Cited by 16 publications

(11 citation statements)

References 31 publications

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“…It was organomodified by exchange of basal metal cations with methylbenzyl di-hydrogenated tallow ammonium chloride (Noramonium MB2HT) by colleagues at Lietuvos Energetikos Institutas (LEI). 4 Although other quaternary alkylammonium salts have been employed by other researchers for the organomodification of bentonite, benzylmethyl di-hydrogenated tallow ammonium chloride, (Noramonium MB2HT), has never been used so far as a Mt organomodifier, and hence no studies on the effect of the specific nanoclay in cementitious matrices have been published. The stated properties of Noramium MB2HT are: active material 83.77%, the average molecular weight 640 g/mol.…”

Section: Organomodified Nmt Dispersions (Nc1 and Nc2)mentioning

confidence: 99%

“…In the past decade bentonite clay and its main phase, montmorillonite (Mt), a naturally abundant clay mineral, has gained momentum in concrete research as a supplementary cementitious material (SCM). [1][2][3][4][5] Mt, has a 2:1 layered structure and each layer consists of one aluminol (Al-OH) octahedral sheet, held together between two siloxane (Si-O) tetrahedral sheets. 6 Mt layers have submicron lateral dimensions (100 nm to several microns) but their thickness is about 1 nm.…”

Section: Introductionmentioning

confidence: 99%

“…10,11 Recent research published on the effect of NMt in cement formulations, has been focused on the organomodified type. 4,[12][13][14] However, organomodification renders the Mt thermodynamically incompatible with the hydrating cement matrix. For this reason it has been suggested that if Mt is dispersed in water with a water soluble polymer, an effective nanocomposite can be produced avoiding the organomodification process.…”

Section: Introductionmentioning

confidence: 99%

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Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Papatzani

Paine

2017

Nanocomposites

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The compatibility of three nano-montmorillonite (NMt) dispersions in hydrating cement binders was investigated and a new theory linking the nanostructure of nanoclay dispersions to their effect on the macroscale performance of cement pastes is presented. Two aqueous organomodified NMt dispersions (one dispersed with non-ionic fatty alcohol and the other with anionic alkyl aryl sulfonate) and one aqueous inorganic NMt dispersion (dispersed with sodium tripolyphosphate) were characterized via transmission electron microscopy imaging and crystallography, X-ray diffraction, Scanning electron microscopy/X-ray energy dispersive spectroscopy, and thermogravimetric analysis/differential thermogravimetry. With this characterization protocol, the way carbon loading and surfactants interact with the nanostructure of the nanoclay dispersions in light of their addition in composite cements was clarified. The suggested methodology is suited for the characterization of nanoclay dispersions and the new theory developed will open up a new horizon for the understanding and exploitation of nano-montmorillonite as a supplementary cementitious material.

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Section: Organomodified Nmt Dispersions (Nc1 and Nc2)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Papatzani

Paine

2017

Nanocomposites

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“…A number of studies [7][8][9] have recently reported promising results around its application to replace more conventionally used additions such as fly ash or slag. Few studies on its non-pre-calcined use have been found in the literature [10][11][12][13][14][15][16][17][18][19][20]. Its use in foundations and for stabilizing the soil [21][22][23] however is much more common, although for that approach has consistently posed rheological problems.…”

Section: Introductionmentioning

confidence: 99%

Decrease of Carbonation, Sulfate and Chloride Ingress due to the Substitution of Cement by 10% of Non Calcined Bentonite

Andrade¹,

Martínez-Serrano²,

Sanjuán³

et al. 2021

Preprint

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Clinker production is being reduced worldwide in response to the need to drastically lower greenhouse gas emissions. The trend began in the nineteen seventies with the advent of mineral additions to replace clinker. Blast furnace slag and fly ash, industrial by-products that were being stockpiled in waste heaps at the time, have not commonly been included in cements. Supply of these additions is no longer guaranteed, however, due to restrained activity in the source industries for the same reasons as in clinker production. The search is consequently on for other additions that may lower pollutant gas emissions without altering cement performance. In this research bentonite, a very common clay, was used as such an addition directly, with no need for pre-calcination, an still novel approach that has gone little explored to date for reinforced concrete with structural applications. The results of the mechanical strength and chemical resistance (to sulfates, carbonation and chlorides) tests conducted are promising. The carbonation findings proved to be of particular interest, for that is the area where cement with mineral additions tend to be least effective. In the bentonite-bearing material analysed here, however, carbonation resistance was found to be low as or lower than observed in plain Portland cement.

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“…Furthermore, the evolution of nanotechnology, has not only rendered monitoring of matter, at a scale marginally above the atomic, possible, but has also revolutionized cement science, producing novel cements and concretes of superior strength and durability [4,5]. Under the European Union FP7 project (FIBCEM), various nanoparticles (commercially available or produced by the project partners) were tested in cementitious matrices at the University of Bath, in an effort to produce low carbon footprint cements [6][7][8][9][10]. For this, the amount of Portland cement (PC) had to be limited and supplementary cementitious materials had to be added, forming blended cementitious matrices.…”

Section: Introductionmentioning

confidence: 99%

A Step by Step Methodology for Building Sustainable Cementitious Matrices

Paine

2020

Applied Sciences

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In an effort to produce cost-effective and environmentally friendly cementitious binders. mainly ternary (Portland cement + limestone + pozzolanas) formulations have been investigated so far. Various proportions of constituents have been suggested, all, however, employing typical Portland cement (PC) substitution rates, as prescribed by the current codes. With the current paper a step by step methodology on developing low carbon footprint binary, ternary and quaternary cementitious binders is presented (PC replacement up to 57%). Best performing binary (60% PC and 40% LS (limestone)) and ternary formulations (60% PC, 20% LS, 20% FA (fly ash) or 43% PC, 20% LS 37% FA) were selected on the grounds of sustainability and strength development and were further optimized with the addition of silica fume. For the first time a protocol for successfully selecting and testing binders was discussed and the combined effect of highly pozzolanic constituents in low PC content formulations was assessed and a number of successful matrices were recommended. The present paper enriched the current state of the art in composite low carbon footprint cementitious binders and can serve as a basis for further enhancements by other researchers in the field.

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Cement substitution by organoclay – The role of organoclay type

Cited by 16 publications

References 31 publications

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Inorganic and organomodified nano-montmorillonite dispersions for use as supplementary cementitious materials – a novel theory based on nanostructural studies

Decrease of Carbonation, Sulfate and Chloride Ingress due to the Substitution of Cement by 10% of Non Calcined Bentonite

A Step by Step Methodology for Building Sustainable Cementitious Matrices

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