Effects of chromium(VI) reducing agents in cement on corrosion of reinforcing steel

Rosković, R.; Stipanović, Irina; Radić, Jure; Serdar, Marijana

doi:10.1016/j.cemconcomp.2011.08.006

Cited by 18 publications

(3 citation statements)

References 10 publications

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“…The increase in the mass of the tiles is attributed by the formation of Fe 2 (SO) 4 [52], from the chemical reaction between Fe 2 O 3 and sulphuric acid produces Fe 2 (SO) 4 [53].…”

Section: Resistances To Acid and Alkaline Exposuresmentioning

confidence: 99%

Engineering properties and microstructure of a sustainable roof tile manufactured with waste rice husk ash and ceramic sludge addition

Silva

Aagani

Gebremariam

et al. 2022

Case Studies in Construction Materials

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“…The increase in the mass of the tiles is attributed by the formation of Fe 2 (SO) 4 [52], from the chemical reaction between Fe 2 O 3 and sulphuric acid produces Fe 2 (SO) 4 [53].…”

Section: Resistances To Acid and Alkaline Exposuresmentioning

confidence: 99%

Engineering properties and microstructure of a sustainable roof tile manufactured with waste rice husk ash and ceramic sludge addition

Silva

Aagani

Gebremariam

et al. 2022

Case Studies in Construction Materials

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“…For example, ferrous sulphate, one of the most widely used reducing agents, is susceptible to oxidation by air. In addition, there is evidence that ferrous sulphate affects the performance of cement and increases the corrosion of reinforcing steel in concrete [18]. Therefore, reducing agents cannot be added in large quantities.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

Shi

Jiang²,

Ji³

et al. 2022

IJERPH

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Due to the toxicity and mobility of chromium, the disposal of chromium-containing waste is a pressing issue. Co-processing of chromium-containing waste in a cement kiln is currently one of the most effective methods. However, the presence of water-soluble hexavalent chromium (Cr(VI)) in cement limits the use of this method. In this study, Na2CO3 was used to simulate alkali in industrial raw materials to investigate the pattern of influence of alkali content on water-soluble hexavalent chromium. The mechanisms associated with the oxidation and dissolution of chromium were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma emission spectrometry (ICP-OES). The proportion of Cr(VI) in the clinker detected by XPS increased rapidly with increasing alkali content. In the cement slurry system, alkali promotes more hexavalent chromium leaching by influencing pH and other ion concentrations (Ca2+, SO42−). Therefore, the addition of alkali to either the raw meal or to the cement slurry system will favour an increase in the water-soluble Cr(VI) content. This study may provide theoretical guidance for the preparation and use of clinkers containing chromium.

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“…Chromium, one of the 25 most abundant elements in the Earth’s crust with an average concentration of 100 ppm [ 1 ], is an indelible trace element in raw materials for manufacturing cement clinker [ 2 ]. However, chromium in cements can originate not only from the raw materials (clays and limestone- or iron-based ingredients) but also from other sources, such as refractory bricks lining the kiln, mineral admixtures, and grinding media in the final finishing mills [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Study on Cr(VI) Leaching from Cement and Cement Composites

Estokova

Palascakova

Kaňuchová

2018

IJERPH

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This paper reports an experimental study on hexavalent chromium leaching from cement samples and cement composites containing silica fume and zeolite additions that were subjected to various leaching agents. The water-soluble Cr(VI) concentrations in cements ranged from 0.2 to 3.2 mg/kg and represented only 1.8% of the total chromium content. The presence of chromium compounds with both chromium oxidation states of III and VI was detected in the cement samples by X-ray photoelectron spectroscopy (XPS). Leaching tests were performed in a Britton-Robinson buffer to simulate natural conditions and showed increased dissolution of Cr(VI) up to 6 mg/kg. The highest amount of leached hexavalent chromium was detected after leaching in HCl. The findings revealed that the leaching of chromium from cements was higher by 55–80% than that from the cement composites. A minimum concentration was observed for all cement samples when studying the relationship between the soluble Cr(VI) and the cement storage time.

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Effects of chromium(VI) reducing agents in cement on corrosion of reinforcing steel

Cited by 18 publications

References 10 publications

Engineering properties and microstructure of a sustainable roof tile manufactured with waste rice husk ash and ceramic sludge addition

Engineering properties and microstructure of a sustainable roof tile manufactured with waste rice husk ash and ceramic sludge addition

Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

Study on Cr(VI) Leaching from Cement and Cement Composites

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