Study of the Deterioration of Concrete Influenced by Biogenic Sulphate Attack

Eštokov, A.; Harbulakova, Vlasta Ondrejka; Luptáková, Alena; Števulová, Nadežda

doi:10.1016/j.proeng.2012.07.566

Cited by 19 publications

(6 citation statements)

References 10 publications

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“…The increase in weight was measured for "G" type composites with bacteria influence as well as for its abiotic control. These results corresponds to noticeable formation of solid phases on the composites surfaces as referred in [18][19][20][21] such as gypsum, ettringite or thaumasite. Deterioration of cement based materials under bacteria influence was confirmed by many researches [6,[22][23][24][25] but according to literature needs relatively long time.…”

Section: Resultsmentioning

confidence: 81%

Study of durability of fibrous cement based materials exposed to microorganisms

Harbulakova

Estokova

2014

The 9th International Conference "Environmental Engineering 2014"

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Fibrous cement based materials belong to the main long-lasting building materials. Few building materials offer a combination of architectural scope and strong technical specification as convincing as fibrous cement based materials e.g. cladding and roofing. One of the most desirable qualities of fibrous cement based board is its durability due to its ability to resist all kinds of weather conditions. Frost and thaw, heat, hale or rain does not pose a threat to fibrous cement based materials. Unlike wood siding, fibre board siding doesn't rot or require frequent repainting. Inside buildings fibrous cement based materials are applied as backer board in wet areas or for dry walls in heavy duty applications where fire resistance and strength are the dominant requirements. The paper is primarily concerned with fibrous cement based specimens' microbially influenced under laboratory conditions during 3 months. In the experiment, sulphate-reducing bacteria (SRB) genera Desulfovibrio spp. and sulphur-oxidising bacteria Acidithiobacillus thiooxidans were used. The role of bacteria mentioned above has been linked to the generation of biogenic sulphuric acid resulting in corrosion process by dissolution of calcium containing minerals from the matrices of building materials. Cement fibres boards exposed to simultaneous deleterious effect of bacteria were evaluated by weight and surface changes of the specimens and pH values changes in leachates.

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Section: Resultsmentioning

confidence: 81%

Study of durability of fibrous cement based materials exposed to microorganisms

Harbulakova

Estokova

2014

The 9th International Conference "Environmental Engineering 2014"

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“…El proceso consta de varias fases [9,10]. En la primera, los sulfatos presentes en el medio acuoso o en los lodos sedimentados son reducidos por la acción de los organismos anaerobios, produciendo sulfuro de hidrógeno (SH2) gaseoso.…”

Section: Degradación Por áCido Sulfúrico De Origen Biogénicounclassified

Durabilidad del hormigón por ataque ácido en estaciones depuradoras de aguas residuales. Casos prácticos de diagnóstico

Sánchez

Cuaresma²

2020

hya

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En este artículo se presentan los resultados y conclusiones de los estudios experimentales efectuados para el diagnóstico de los graves daños detectados en las zonas emergidas de los paramentos de hormigón de los decantadores, canales de reparto, reactores biológicos, depósitos de fangos y de diversos pozos y galerías de tres estaciones depuradoras de aguas residuales. La agresividad de las aguas y lodos analizados corresponde, según la Instrucción EHE-08, a la de las clases específicas de exposición Qb (ataque medio) debido a los contenidos de sulfatos y Qc (ataque fuerte) por los de ion amonio. Sin embargo, el nivel de deterioro de los hormigones inspeccionados y analizados es muy superior al que sería ocasionado por estos agentes agresivos considerando el tiempo de vida en servicio de las tres estructuras. Se exponen y analizan los resultados de las inspecciones efectuadas y de los ensayos de caracterización de los hormigones (resistencia, dosificación porosidad, permeabilidad …) realizados sobre probetas testigo extraídas de zonas sin daños y de zonas alteradas, y de los ensayos de diagnóstico (determinaciones de pH del extracto acuoso de las superficies degradadas, perfiles de sulfatos y cloruros a distintas profundidades, análisis microestructural por microscopía electrónica de barrido con EDX …) sobre testigos extraídos en zonas con daños. Los citados resultados evidencian que el severo deterioro superficial observado en los paramentos emergidos de los elementos del hormigón originalmente empleados en obra, así como de los morteros de reparación circunstancialmente aplicados, es compatible con la degradación producida por un ataque ácido de estos materiales fabricados con cemento portland. El agente agresivo causante del deterioro es el ácido sulfhídrico generado por los procesos de digestión bacteriana del tratamiento biológico de las aguas residuales.Finalmente se evalúan las limitaciones de la reglamentación vigente para el diseño de la durabilidad frente al ataque ácido en este tipo de estructuras, las causas del defectuoso comportamiento de las reparaciones previas efectuadas en alguna de las instalaciones objeto de estudio, y los requisitos recomendables para una correcta selección de los sistemas de reparación aplicables.

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“…3CaSO4.3H2O). Finally, ettringite is a friable material that forms from the incomplete reaction of the sulphuric acid and the cement paste (Eštokov et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Study on Durability of the Concrete of Sanitation Network in Ouargla Algeria Under the Existence of Sulphates Attack

Boumehraz

Mellas

Kriker

2018

Indonesian J. Sci. Technol

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The objective of this research was to evaluate pipes for domestic applications in Ouargla Algeria. The experiment procedure was done by investigating the sanitation networks as a function of type of pipes, concrete used, and waste concentration (as sulfates and hydrogen sulphide composition).The analysis was also completed by the comparison between the realistic pipe condition and the pipe specimen control in laboratium. The results showed that decreases in mechanical strength of the pipe were obtained. The compressive strength of the specimens has decreased down to 3% after 1 year. When exposing the specimen to hydrogen sulphide gas, a rapid deterioration was obtained since 90 days of expossure. Further, the worst change in compressive strength was found, in which the reduction of compressive strength was found down to 40%.

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Study of the Deterioration of Concrete Influenced by Biogenic Sulphate Attack

Cited by 19 publications

References 10 publications

Study of durability of fibrous cement based materials exposed to microorganisms

Study of durability of fibrous cement based materials exposed to microorganisms

Durabilidad del hormigón por ataque ácido en estaciones depuradoras de aguas residuales. Casos prácticos de diagnóstico

Study on Durability of the Concrete of Sanitation Network in Ouargla Algeria Under the Existence of Sulphates Attack

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