The Influence of Barium Sulphate and Barium Carbonate on the Portland Cement

Zezulová, Anežka; Staněk, Theodor; Opravil, Tomáš

doi:10.1016/j.proeng.2016.07.358

Cited by 25 publications

(9 citation statements)

References 5 publications

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“…However, a decrease by 2% only in TiO 2 fraction might not be enough to affect the growth of the alite in the cement. On the other hand, the 36% augmentation of BaO content is likely to cause the growth of the alite nanocrystals to greater dimensions as reported in [37].…”

Section: Chemical Compositionmentioning

confidence: 86%

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Mohamed

Osman

Smaoui

et al. 2018

Advances in Civil Engineering

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Arabic gum biopolymer (AGB) has recently been demonstrated to improve mechanical and physical properties of fresh and hardened concrete which makes it a promising sustainable and environmentally friendly water-reducing admixture. The present work focuses on the effect of added AGB on the workability, setting time, and durability of concrete. Furthermore, a microstructure analysis is conducted to provide objective evidence and support for previous findings and hypothetic interpretations. Flow table experiments are conducted on Portland cement mortar mixed with different percentages of AGB to evaluate the workability. The initial setting time of cement paste is measured for different AGB contents. X-ray fluorescence tests are performed on cement-AGB mix powder to determine its chemical composition. Carbonation depth in AGB concrete samples is estimated to assess durability. AGB-added cement powder was subjected to X-ray diffraction and SEM tests to determine the rate of hydration and to expose the microstructure properties of AGB cement mix and help explain its macroscopic behavior, respectively.

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Section: Chemical Compositionmentioning

confidence: 86%

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Mohamed

Osman

Smaoui

et al. 2018

Advances in Civil Engineering

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“…SEM-EDS analyses of "fake Ceppo di Grè" highlighted unusual peaks of Ba, thus suggesting that Ba hydroxide was added to the mixture to make the concrete harder and therefore resistant to physical and mechanical stress and degradation. The same procedure might have been used for cement, in which barium may be added to help bind and enhance resistance to different types of radiation (Zezulová et al, 2016). Barium cations are a part of the raw mixture and thus can be incorporated into the crystal lattices of alite and belite, and the interstitial phase.…”

Section: Discussionmentioning

confidence: 99%

“…These findings are in accordance with the high SiO 2 /calcium in the Ba-rich matrix (spectrum 70-72). Zezulová et al (2016) have observed that an excessive BaO concentration can inhibit the crystallization of alite or decompose alite in favor of belite and free lime. The free lime then produces an excess of portlandite, which, in the presence of sulfur in the mixture, justifies the high content of calcium sulfate observed with SEM analyses in this process.…”

Section: Discussionmentioning

confidence: 99%

Rationalist architecture in rural villages: petro-morphological characterization of natural asbestos fibers in decorative plasters used for artificial stones

et al. 2020

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At the beginning of the twentieth century, artificial stones became commonly used as structural building materials, masonry materials, and architectural decorative elements. The main purpose of this work was to characterize the building materials used in a historical building in Codigoro, a small town near Ferrara, northeastern Italy. This building was constructed according to the Italian rationalist rules for monumental architecture and is an example of the rationalist architecture found in rural villages, which uses innovative materials and decorations including artificial stone. The samples analyzed in this work were imitation natural stone, such as "fake travertine" and "fake Ceppo di Grè", composed of reinforced concrete slabs coated with white mortar. Asbestos minerals have been observed in the fillers in these materials. Petrographic, mineralogical, and chemical characterization of samples of artificial stones and concrete was performed with optical transmitted light microscopy, scanning electron microscopy-energy dispersive spectroscopy, and X-ray diffraction analyses. The results revealed chemical and biological degradation in almost all the artificial stones examined and enabled identification of the presence of calcite, iron oxychloride complexes, and asbestos lizardites used as fillers in two of the analyzed samples. This study aimed to describe a general investigation methodology used to examine the artificial stone façades of the Ex Casa del Fascio of Codigoro, whose architecture is particularly representative of the rationalist architecture in rural villages. The results highlight the relevance of compatible and suitable conservation measures that should be monitored during all restoration interventions to minimize post-degradation fracturing and transformation into elements harmful to human health and the environment.

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“…This is used as a weighing agent during drilling operations (Ibrahim et al, 2017) due to its exceptionally high specific gravity (4.2-4.5). Zezulová et al (2016) used 0.5-5.0% barium sulfate and barium carbonate in the raw mix and studied phase formation. They showed an increase in alite formation when up to 1% Ba was in the raw mix.…”

Section: Particle Size Distribution and Decarbonationmentioning

confidence: 99%

The use of oil-based mud cuttings as an alternative raw material to produce high sulfate-resistant oil well cement

Abdul‐Wahab

Al-Dhamri

Ram³

et al. 2020

Journal of Cleaner Production

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The Influence of Barium Sulphate and Barium Carbonate on the Portland Cement

Cited by 25 publications

References 5 publications

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Durability and Microstructure Properties of Concrete with Arabic Gum Biopolymer Admixture

Rationalist architecture in rural villages: petro-morphological characterization of natural asbestos fibers in decorative plasters used for artificial stones

The use of oil-based mud cuttings as an alternative raw material to produce high sulfate-resistant oil well cement

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