The effect of red mud in the electrochemical behaviour of carbon steel embedded in mortar

Díaz, Belén; Freire, L.; Merino, P.; Nóvoa, X.R.; Pérez, M.C.

doi:10.3989/revmetalm.2008.v44.i3.113

Cited by 1 publication

(2 citation statements)

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“…Furthermore, those authors [31] also pointed out that with an increase in red mud content from 0% to 25%, the reduction in the quantities of CO, NO X , Pb and SO 2 is about 32.5%, 31.8%, 17.1% and 22.4% respectively. Finally, the relatively good behaviour of red mud regarding the resistance to chloride ingress observed here will be in line with other investigations [23][24][25][26][27], in which it has been shown that red mud has good performance in relation to the protection against corrosion of steel reinforcements embedded in concrete.…”

Section: Forced Migration Testsupporting

confidence: 92%

“…In relation to the use of red mud in cement-based materials, considering its composition, it is possible that it has pozzolanic activity and some research has pointed out this possibility [21,22]. Along this line, there are several dispersed works related to the use of this addition in those materials and some of them have shown that red mud seems to improve protection against corrosion of reinforcements embedded in concrete [23][24][25][26], as well as the transport properties of cement-based materials [27]. In addition to this, there are also some recent studies in which the mechanical strengths of cementitious materials with red mud have been analysed.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Red Mud Addition in the Microstructure, Durability and Mechanical Performance of Cement Mortars

et al. 2019

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Recently, there has been a great effort to incorporate industrial waste into cement-based materials to reach a more sustainable cement industry. In this regard, the Bayer process of obtaining alumina from bauxite generates huge amounts of waste called red mud. Few research articles have pointed out the possibility that red mud has pozzolanic activity. In view of that, the objective of this research is to analyse the short-term effects in the pore structure, mechanical performance and durability of mortars which incorporate up to 20% of red mud as a clinker replacement. As a reference, ordinary Portland cement and fly ash Portland cement mortars were also studied. The microstructure was characterised through mercury intrusion porosimetry and non-destructive impedance spectroscopy, which has not previously been used for studying the pore network evolution of red mud cement-based materials. The possible pozzolanic activity of red mud has been checked using differential scanning calorimetry. The non-steady state chloride migration coefficient and the mechanical properties were studied too. According to the results obtained, the addition of red mud entailed a greater microstructure refinement of the mortar, did not worsen the resistance against chloride ingress and reduced the compressive strength compared to control binders.

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