Immobilization of Zn(II) in Portland cement pastes

Mellado, A.; Borrachero, M. V.; Soriano, L.; Payá, J.; Monzó, J.

doi:10.1007/s10973-012-2705-8

Cited by 31 publications

(6 citation statements)

References 31 publications

(34 reference statements)

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“…Pastes only with ZnO hydration at seven days have started in both mixing methods, although higher advanced points for pastes are obtained by manual mixing. In Figures 4(a)-4(c), two peaks appear before 200°C and 300°C, respectively, that could correspond to the decomposition of hydrated calcium hydroxyzincate (CaZn 2 (OH) 6 ·2H 2 O) and hydrozincite according to Mellado et al [54]. In Figure 4(a), these peaks can appear overlapping with the hydration of tricalcium aluminates and therefore have a greater intensity.…”

Section: Resultsmentioning

confidence: 90%

“…Subsequently, these will be converted to a C 3 AH 6 cubic phase according to the literature and weight loss of carbonates as consequence carbonation of the samples (Ramachandran et al [53]). e DTG of hydrated calcium hydroxyzincate (CaZn 2 (OH) 6 ·2H 2 O) synthesized (Mellado et al [54]) shows three peaks, the first two overlapped in a temperature range between 140°C and 220°C corresponding to the two first stages' decomposition of CaZn 2 (OH) 6 ·2H 2 O. At the lowest temperature, the dehydration of CaZn 2 (OH) 6 ·2H 2 O takes place, and between 160°C and 220°C in the DTG, a wide peak appears corresponding to the decomposition of CaZn 2 (OH) 6 in ZnO and Ca(OH) 2 .…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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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“…The main steps of testing the rheological properties of cured mortar are: before each measurement, the mortar sample is fully mixed, and then the mixing blade is inserted into the specimen [6] .…”

Section: Rheological Properties Testmentioning

confidence: 99%

Study on the properties of solidified materials of municipal waste incineration ash cementitious materials

Wang,

Weng,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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MSWI FA needs to be treated effectively to prevent harmful effects on the environment and human beings. The use of different ratios of cementitious materials for the solidification of fly ash provides innovative ideas for the environmentally friendly treatment of MSWI FA. In this study, some raw materials were used to solidify fly ash, and it was revealed that the incorporation of appropriate concentrations of fly ash (20 and 30%) could improve the compressive strength, fluidity, pore structure, and rheological properties of the solidified materials, and reduce the setting time, the bleeding rate, and inhibit the phenomenon of drying shrinkage of the solidified materials. However, when the content of MSWI FA exceeded 40%, the performance of the solidified material decreased significantly due to the poor volcanic ash activity and the high water absorption capacity of MSWI FA.

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“…It has been mentioned before that zinc and ZnO can slow down cement curing by formation of Zn(OH) 2 and/or [Zn(OH) 4 ] 2-. This phenomenon is commonly explained by encasing the unreacted grains of cement by these compounds, thus slowing down the hydration [24][25][26][27]. However, it has been also shown that zinc corrosion products are partially able to integrate with forming C-S-H gel and change its morphology to fibrous.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Corrosion of Zinc Powder on Mechanical Properties of Concrete

Pokorný¹

2016

Ceramics - Silikaty

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This paper studies the effect of zinc corrosion in fresh concrete on the process of its hydration and evolution of common mechanical properties. Process of hydration was monitored by temperature measurement of hydrating concrete contaminated with zinc powder (0.5; 5.0 wt. %) in closed system. Mechanical properties were monitored in similarly contaminated concrete samples (compressive cubic strength, compression modulus of elasticity). The results suggest that zinc corrosion products retard the concrete hydration and evolution of mechanical properties, however, forming hydrogen also has some negative effect.

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Immobilization of Zn(II) in Portland cement pastes

Cited by 31 publications

References 31 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

Study on the properties of solidified materials of municipal waste incineration ash cementitious materials

The Influence of Corrosion of Zinc Powder on Mechanical Properties of Concrete

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