Identification of acid attack on concrete of a sewage system

Fernandes, Isabel; Pericão, M.; Hagelia, Per; Noronha, Fernando; Ribeiro, Maria dos Anjos; Maia, Joana

doi:10.1617/s11527-011-9769-y

Cited by 39 publications

(14 citation statements)

References 22 publications

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“…The dissolved chlorides from the external environment could permeate through sound concrete or cracks to the steel surface thus inducing corrosion of the steel bar (Grengg et al, 2018). In sewers, however, gaseous H 2 S and the biogenic sulfuric acid, produced in corrosion biofilms (Parker, 1945a, b), are commonly accepted to be the corrosive substances rather than chlorides (Fernandes et al, 2012). In the active corrosion regions of sewers, such as the pipe crown area (Jiang et al, 2014a, Jiang et al, 2015b, the roles and interactions of chloride, H 2 S and sulfuric acid in the rebar corrosion process are unknown.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Corrosion of reinforcing steel in concrete sewers

2018

Focus on Powder Coatings

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Hydrogen sulfide is a controlling factor for concrete corrosion in sewers, although its impact on sewer rebar corrosion has not been investigated to date. This study determined the corrosion mechanism of rebar in sewers by elucidating the roles of chloride ions, apart from the effects of hydrogen sulfide and biogenic sulfuric acid. The nature and distribution of rusts at the steel/concrete interface were delineated using the advanced mineral analytical techniques, including mineral liberation analysis and micro X-ray diffraction which is the first-ever use in such studies. The corrosion products were found to be mainly iron oxides or oxy-hydroxides. H 2 S and biogenic sulfuric acid did not directly participate in the product formation of steel partly covered by concrete or directly exposed to sewer atmosphere. Instead, chloride ions played an important role in initiating steel corrosion in sewers, supported by a thin chloride-enriched layer at the steel/rust interface. Away from the chloride-enriched layer, iron oxides accumulated on both sides of the mill-scale to form a corrosion layer and corrosion-filled paste respectively. The corrosion layer around rebar circumference was non-uniform and the rust thickness with respect to polar coordinates followed a Gaussian model. These findings support predictions of

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Section: Accepted Manuscriptmentioning

confidence: 99%

Corrosion of reinforcing steel in concrete sewers

2018

Focus on Powder Coatings

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“…The degradation of concrete sanitation networks has become a major problem worldwide. In some of the worst cases, the lifetime of sewer pipes and pumping stations has been reduced to less than 10 years (Olmsted and Hamlin, 1900; Hvitved‐Jacobsen et al , 2002; Fernandes et al , 2012). Hydrogen sulphide (H 2 S) is considered the main cause of the reduction in the service life of these, essential and expensive structures causing a microbial‐induced concrete corrosion (US‐EPA, 1991; Zhang et al , 2008; Jiang et al , 2015, 2016).…”

Section: Introductionmentioning

confidence: 99%

Corrosion of concrete pipes in a sewer environment – two case studies

Oualit

Jauberthie

2019

Water & Environment J

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The deterioration and cost-effective maintenance of infrastructure has for many years been an area of social and financial importance. The deterioration of the wastewater infrastructure is particularly important because of its key role in the maintenance of public health for urban conglomerations. This paper describes two case studies that are taken from an ongoing study of the sewerage network in the Municipality of Rennes, France. Both studies concern spun concrete pipes laid approximately 55 years ago. The first case is that of a sewer in good order because of its location within the network and its design. The second case describes a sewer that has been oversized and the conditions within the reach of the sewer have led to sulphide attack. It is concluded that two important considerations that must be taken into account is the design detailing and appropriate selection of materials.

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“…Under anaerobic conditions in the bottom part of the pipelines, the sulfate reducing bacteria, e.g. Desulfovibrio, reduce sulfurcompounds in the waste water to H 2 S. Due to low solubility of H 2 S, turbulence of waste water and decreasing pH, H 2 S volatilizes to the sewer atmosphere, where its concentration can be higher than 200 ppm [6]. H 2 S redissolves in condensate on the sewer crown and diffuses into the surface layer of the concrete.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Water/Cement Ratio on the Sulfate Corrosion of Fine Grained Concrete

Vyšvařil¹

2014

IJRET

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Sulfate corrosion is one of the major threats for durability of concrete constructions and it becomes a major destructor in sewage collection systems where concrete sewer pipes are exposed to sulfates from waste water as well as from biogenic activity of bacteria. The second type of corrosion is termed microbiologically induced concrete corrosion (MICC) and during this process the pH of the surface of concrete sewer pipes is reduced and it may lead to steel depassivation and results in the corrosion of this steel reinforcement. This paper is focused on the sulfate attack on fine grained concrete where the effect of 0.5% sulfuric acid emulating MICC and also effect of solution simulating sewage water on the concrete samples with three different water/cement ratios (w/c = 0.4, 0.45 and 0.5) have been investigated. After 1, 3 and 6 months of the corrosive treatment the content of sulfate ions and pH values in several layers of specimens were determined. It was found that the sulfate ions penetrate into concrete to maximum depth of 20 mm and the pH of the aqueous leaches of particular layers of the samples was reduced to 11.92 at the most. Thus, the conditions for the depassivation of reinforcement were not met.

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Identification of acid attack on concrete of a sewage system

Cited by 39 publications

References 22 publications

Corrosion of reinforcing steel in concrete sewers

Corrosion of reinforcing steel in concrete sewers

Corrosion of concrete pipes in a sewer environment – two case studies

The Effect of Water/Cement Ratio on the Sulfate Corrosion of Fine Grained Concrete

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