Effects of barium salt on the fixation of chloride ions in hardened mortars

Tsuyuki, Naomitsu; Watanabe, Ryutaro; Koizumi, Koshiro; Umemura, Yasuhiro; Machinaga, Osamu

doi:10.1016/s0008-8846(00)00308-2

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…This is also confirmed by the higher porosity values observed for samples with barite (Table 5). Results are also in agreement with Tsuyuki et al (2000) who showed an increase of porosity and the fixation capability of a grout with the addition of barite, and with Fan et al (2013) and Falciglia et al (2011), who reported an increase of the adsorption phenomena with increasing the porosity and with decreasing of the material grain size. A significant reduction of contaminant leached (up to about 65%) with barite amount increasing was also found by Shaaban and Assi (2011) for a cement-barite-matrix doped with 134 Cs.…”

Section: Resultssupporting

confidence: 91%

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Falciglia

Puccio

Romano

et al. 2015

Journal of Environmental Radioactivity

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Section: Resultssupporting

confidence: 91%

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Falciglia

Puccio

Romano

et al. 2015

Journal of Environmental Radioactivity

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“…The bulk density values of nano-size barium sulfate filled cement pastes (up to 2%) were higher than those of both OPC and micro limestone filled cement pastes at all ages of hydration. This is mainly due to the progress in the hydration process which is enhanced due to the high surface area of nano-barium sulfate in addition to its high specific gravity [35]. The bulk density of limestone filled cement samples were less than that of OPC and decreased gradually as the amount of limestone increased.…”

Section: Bulk Density and Total Porositymentioning

confidence: 99%

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Saraya¹,

Bakr²

2015

MSCE

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The aim of the present work is to study the effect of Nano-barium sulfate additions on the physicomechanical properties of hardened cement pastes. Nano-barium sulfate was prepared by the precipitation method. Eight mixes of filled cement pastes containing 0.5 wt%, 1.0 wt%, 1.5 wt% and 2.0 wt% of both nano-barium sulfate and micro-limestone were prepared and compared to the base OPC. The hydration characteristics were evaluated by the measure of combined water content, bulk density, total porosity and compressive strength for samples hydrated up to 90 days. The progress of hydration reactions was followed up by XRD analysis. The morphology and microstructure were studied by SEM. Nano-size barium sulfate acted as a nucleating agent and enhanced the hydration of cement pastes up to 2.0% mass content. Also, the microstructure was improved considerably. Accordingly, nano-size barium sulfate can be used successfully in the preparation of filled cement.

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“…It was also reported that the presence of barium carbonate made ettringite unstable. Barium compounds may immobilize sulfate ions by forming highly insoluble BaSO 4 [7] . The formation of barite makes cement based materials less vulnerable to TSA by reducing sulfate concentration and porosity of the structure.…”

Section: Introductionmentioning

confidence: 99%

Use of different barium salts to inhibit the thaumasite form of sulfate attack in cement-based materials

Wei

Huang

et al. 2016

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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We investigated the effects of different barium compounds on the thaumasite form of sulphate attack (TSA) resistance of cement-based materials when they were used as admixtures in mortars. Moreover, we analyzed the inhibition mechanisms within different types of barium salts, namely BaCO 3 and Ba(OH) 2 , on the thaumasite formation. The control cement mortar and mortars with barium salts to cement and limestone weight ratios of 0.5%, 1.0%, and 1.5% were immersed in 5% (by weight) MgSO 4 solution at 5 ℃ to mimic TSA. Appearance, mass, and compressive strength of the mortar samples were monitored and measured to assess the general degradation extent of these samples. The products of sulphate attack were further analyzed by XRD, FTIR, and SEM, respectively. Experimental results show that different degradation extent is evident in all mortars cured in MgSO 4 solution. However, barium salts can greatly inhibit such degradation. Barium in hydroxide form has better effectiveness in protection against TSA than carbonate form, which may be due to their solubility difference in alkaline cement pore solution, and the presence of these barium compounds can reduce the degree of TSA by comparison with the almost completely decomposed control samples.

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Effects of barium salt on the fixation of chloride ions in hardened mortars

Cited by 12 publications

References 2 publications

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Performance study and influence of radiation emission energy and soil contamination level on γ-radiation shielding of stabilised/solidified radionuclide-polluted soils

Influence of Nano-Barium Sulfate Agglomeration on Microstructure and Properties of the Hardened Cement-Based Materials

Use of different barium salts to inhibit the thaumasite form of sulfate attack in cement-based materials

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