Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength

Tobón, Jorge Iván; Payá, J.; Borrachero, M.V.; Restrepo, Oscar Jaime

doi:10.1016/j.conbuildmat.2012.06.043

Cited by 96 publications

(48 citation statements)

References 22 publications

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“…For 28 days, the hydration process for cement pastes obtained for both mixing methods is similar. Water loss that takes part in the CSH gel (T1) at 28 days for cement pastes with NS is higher than that for the MS ones, with this indicating that nanosilica produces a higher quantity of hydrated phase and showing agreement with the literature (Tobón et al [59]). …”

Section: Figures 4(a)-4(c) Andsupporting

confidence: 80%

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Rubia

Lucas-Gil

Reyes

et al. 2018

Advances in Materials Science and Engineering

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e use of a mixing method based on a novel dry dispersion procedure that enables a proper mixing of simultaneous nanometric functional additions while avoiding the health risks derived from the exposure to nanoparticles is reported and compared with a common manual mixing in this work. Such a dry dispersion method allows a greater workability by avoiding problems associated with the dispersion of the particles. e two mixing methods have been used to prepare Portland cement CEM I 52.5R pastes with additions of nano-ZnO with bactericide properties and micro-or nanopozzolanic SiO 2 . e hydration process performed by both mixing methods is compared in order to determine the efficiency of using the method. e hydration analysis of these cement pastes is carried out at different ages (from one to twenty-eight days) by means of differential thermal analysis and thermogravimetry (DTA-TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analyses. Regardless of composition, all the mixtures of cement pastes obtained by the novel dispersion method showed a higher retardation of cement hydration at intermediate ages which did not occur at higher ages. In agreement with the resulting hydration behaviour, the use of this new dispersion method makes it possible to prepare homogeneous cement pastes with simultaneous functional nanoparticles which are physically supported on the larger particles of cement, avoiding exposure to the nanoparticles and therefore minimizing health risks. Manual mixing of cement-based materials with simultaneous nanometric functional nanoparticles on a large scale would make it difficult to obtain a homogenous material together with the health risks derived from the handling of nanoparticles.

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Section: Figures 4(a)-4(c) Andsupporting

confidence: 80%

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Rubia

Lucas-Gil

Reyes

et al. 2018

Advances in Materials Science and Engineering

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“…For example, nanotechnology has been implemented in the study of building materials in order to improve the mechanical properties and give the materials other additional properties. In these studies, the addition of carbon nanotubes to reduce fissures and improve mechanical properties [1], as well as the insertion of nanoparticles of silica (n-SiO2) [2] and iron oxide (Fe2O3) for the sealing of nanopores [3] has been highlighted. Other types of features have been given to cement, when broadband semiconductor nanoparticles are added, such as the decontaminating of air, and the self-cleaning in buildings, through photocatalytic activity [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Photocatalytic Properties of Portland Cement Blended with Titanium Oxynitride (TiO2−xNy) Nanoparticles

2015

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Photocatalytic activity of Portland cement pastes blended with nanoparticles of titanium oxynitride (TiO2−xNy) was studied. Samples with different percentages of TiO2−xNy (0.0%, 0.5%, 1%, 3%) and TiO2 (1%, 3%) were evaluated in order to study their self-cleaning properties. The presence of nitrogen in the tetragonal structure of TiO2 was evidenced by X-ray diffraction (XRD) as a shift of the peaks in the 2θ axis. The samples were prepared with a water/cement ratio of 0.5 and a concentration of Rhodamine B of 0.5 g/L. After 65 h of curing time, the samples were irradiated with UV lamps to evaluate the reduction of the pigment. The color analysis was carried out using a Spectrometer UV/Vis measuring the coordinates CIE (Commission Internationale de l'Eclairage) L*, a*, b*, and with special attention to the reddish tones (Rhodamine B color) which correspond to a* values greater than zero. Additionally, samples with 0.5%, 1%, 3% of TiO2−xNy and 1%, 3% of TiO2 were evaluated under visible light with the purpose of determining the Rhodamine B abatement to wavelengths greater than 400 nm. The results have shown a similar behavior for both additions under UV light irradiation, with 3% being the addition with the highest photocatalytic efficiency obtained. However, TiO2−xNy showed activity under irradiation with visible light, unlike TiO2, which can only be activated under UV light. OPEN ACCESSCoatings 2015, 5 466

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“…The use of HRTG have commonly been applied in the decomposition of minerals (hydrotalcite, organoclays, peisleyite, montmorillonite), polymers and oil shales [6][7][8][9][10][11][12][13]. In the field of civil construction, only few studies have been reported using HRTG technique [14][15][16][17][18]. Payá et al [14] applied this technique in the study of dehydration of gypsum, yielding the total separation of the two decomposition processes for CaSO 4 .2H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…Payá et al [14] applied this technique in the study of dehydration of gypsum, yielding the total separation of the two decomposition processes for CaSO 4 .2H 2 O. The use of HRTG was performed by Tobón et al [18] in order to assess the effect of SiO 2 nanoparticles blended in Portland cement pastes in the range 100-300 ºC, related to the dehydration of calcium silicate hydrate (C-S-H gel), C-A-S-H and C-A-H. For HRTG, the hydrated phases were successfully separated in the DTG curve.…”

Section: Introductionmentioning

confidence: 99%

Use of high-resolution thermogravimetric analysis (HRTG) technique in spent FCC catalyst/Portland cement pastes

Soriano

Tashima

Bonilla

et al. 2015

J Therm Anal Calorim

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Thermogravimetric analysis (TG) is one of the most common instrumental techniques used for the characterization of pastes, mortars and concretes based on both calcium hydroxide or Portland cement.Important information about pozzolanic materials can be assessed concerning to calcium hydroxide consumption and the formation of new hydrated products. Nevertheless, in some cases, problems associated to the overlapped decomposition processes for hydrates difficult the analysis of obtained data.In this paper the use of high resolution thermogravimetric analysis (HRTG), a powerful technique that allows separating decomposition processes in analysis of hydrated binders, was performed for spent FCC catalyst -Portland cement pastes. These pastes were monitored for 1, 4, 8 hours and 1, 2, 3, 7 and 28 curing days. In order to study the influence of the pozzolanic material (spent FCC catalyst), Portland cement replacements of 5, 15 and 30 % by mass were carried out. The presence of spent FCC catalyst in blended pastes modified the amount and the nature of the formed hydrates, mainly ettringite and stratlingite.

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Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength

Cited by 96 publications

References 22 publications

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Viability Study of a Safe Method for Health to Prepare Cement Pastes with Simultaneous Nanometric Functional Additions

Evaluation of Photocatalytic Properties of Portland Cement Blended with Titanium Oxynitride (TiO2−xNy) Nanoparticles

Use of high-resolution thermogravimetric analysis (HRTG) technique in spent FCC catalyst/Portland cement pastes

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