Atmospheric corrosion of steel reinforcing bars produced by various manufacturing processes

Zitrou, E.; Nikolaou, J.; Tsakiridis, P.E.; Papadimitriou, G.

doi:10.1016/j.conbuildmat.2006.06.004

Cited by 35 publications

(10 citation statements)

References 17 publications

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“…As a result, the bearing capacity and safety margin of a structure with corroding 28 steel bars decreases substantially. Its anticipated ductile failure mode may be changed into a brittle one without an 29 obvious warning [1][2][3] . 30…”

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confidence: 99%

Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT techniques

Liu

et al. 2016

Construction and Building Materials

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Abstract:Corrosion of steel bars in concrete structures is initiated as a result of concrete carbonation and/or 9 chloride intrusion, and influenced by their interaction. This paper presents an experimental investigation into the 10 effect of chloride ions on carbonation of cement paste by means of X-ray CT techniques and mercury intrusion 11 porosimetry(MIP), which is benchmarked by the conventional phenolphthalein method. A group of the cement 12 paste cylinders with different amounts of chlorides ions were manufactured and cured before they were subjected 13 to an accelerated carbonation process in a conditional cabinet regime for different ages. The carbonation front of 14 the cement paste was first evaluated using phenolphthalein method. This was followed by an investigation of 15 microstructure evolution of the cement paste using XCT and MIP techniques. The experimental results show that 16 the carbonation of a cement paste increases with its water to cement ratio and with carbonation ages, but decrease 17 with its amount of chloride ions. In particular, it has been found that increases of chloride ion of a cement paste 18 refine its porous structures, decrease its porosity and eventually mitigate its carbonation rate. The relevant results 19 can be referred to for durability design and prediction of reinforced concrete structures. 20

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confidence: 99%

Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT techniques

Liu

et al. 2016

Construction and Building Materials

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“…Immersed reactive Fe 0 corrodes due to differences in the electrical potential on anodic and cathodic sites on the Fe 0 surface [70,71]. The metal oxidizes at the anode, where corrosion occurs according to Eq.…”

Section: Aqueous Iron Corrosionmentioning

confidence: 99%

Metallic iron for safe drinking water worldwide

Noubactep¹

2010

Chemical Engineering Journal

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a b s t r a c tA new concept for household and large-scale safe drinking water production is presented. Raw water is successively filtered through a series of sand and iron filters. Sand filters mostly remove suspended particles (media filtration) and iron filters remove anions, cations, micro-pollutants, natural organic matter, and micro-organisms including pathogens (reactive filtration). Accordingly, treatment steps conventionally achieved with flocculation, sedimentation, rapid sand filtration, activated carbon filtration, and disinfection are achieved in the new concept in only two steps. To prevent bed clogging, Fe 0 is mixed with inert materials, yielding Fe 0 /sand filters. Efficient water treatment in Fe 0 /sand filters has been extensively investigated during the past two decades. Two different contexts are particularly important in this regard: (i) underground permeable reactive barriers and (ii) household water filters. In these studies, the process of aqueous iron corrosion in a packed bed was proven very efficient for unspecific aqueous contaminant removal. Been based on a chemical process (iron corrosion), efficient water treatment in Fe 0 beds is necessarily coupled with a slow flow rate. Therefore, for large communities several filters should work in parallel to produce enough water for storage and distribution. It appears that water filtration through Fe 0 /sand filters is an efficient, affordable, a flexible technology for the whole world.

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“…[2]. The corrosion of structural steels is a very worrying case since this gradually induces the formation of cracks in concrete, because of the presence of corrosion products (oxides, hydroxides and oxyhydroxides) is greatly favored by the long atmospheric exposure time of the reinforcing bar during the transport and storage before installation [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Obtaining a hematite pigment by thermal transformation of the surface oxide of reinforcing steel bars

Colpas-Ruiz¹,

Gnecco-Molina²,

Pérez³

et al. 2020

revuin

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En esta investigación,se reporta la valorización de la cascarilla de óxido superficial de varillas de acero al carbono mediante su transformación térmica en un pigmento compuesto principalmente por hematita (ɑ-Fe2O3). Se utilizó la Fluorescencia de Rayos X (XRF) yla Difracción deRayos X (XRD) para determinar el contenido elemental del residuo procesado e identificar los óxidos de hierro involucrados en la calcinación, respectivamente. El residuo siderúrgico en polvo se compone mayoritariamente por Fe2O3(87.92 %), SiO2 (6.13%),CaO (1.88 %), Al2O3(1.30 %) y MnO (0.77 %). El contenido total de hierro tiene principalmente el siguiente contenido en óxidos de hierro: magnetita, maghemita, wustita, lepidocrocita, hematita y goetita. El tratamiento térmico del residuo a temperaturas de 750-850 °C y tiempos de sostenimiento de 0.5-1.50 h, evidenció una alta conversión de los óxidos de hierro precursores en hematita, con porcentajes de esta fase que oscilan entre 86.4 y 94.6 %. La mayor obtención de hematita se logró a una condiciónde 850 °C y 1.00 h.

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Atmospheric corrosion of steel reinforcing bars produced by various manufacturing processes

Cited by 35 publications

References 17 publications

Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT techniques

Effects of chloride ions on carbonation rate of hardened cement paste by X-ray CT techniques

Metallic iron for safe drinking water worldwide

Obtaining a hematite pigment by thermal transformation of the surface oxide of reinforcing steel bars

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