Influence of the cement type on the resistance of concrete to feed acids

Belie, Nele De; Verselder, Hans Jurgen; Blaere, Benny De; Nieuwenburg, Dirk Van; Verschoore, Reinhart

doi:10.1016/s0008-8846(96)00155-x

Cited by 66 publications

(33 citation statements)

References 2 publications

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“…However, sileage produces lactic and acetic acids and, in relation to the durability of GGBS concrete on exposure to these, results in literature were contradictory. For example, De Belie et al (1996) conclude that GGBS enhanced concrete possesses a higher resistance to acid attack than PC concrete while Kleinlogel (1960) agrees with the above and states that acetic acid attacks PC concrete twice as fast as it does BS concrete. In addition, McCloskey et al (1997) conclude that the inclusion of blast furnace slag at 60% reduced corrosion of the concrete by silage effluent by 18-37%.…”

Section: Introductionmentioning

confidence: 86%

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Pavía

Condren

2008

J. Mater. Civ. Eng.

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Ordinary Portland cement (OPC) has been traditionally used in the construction of concrete silos in Ireland. However, the aggressive nature of the effluent produced by silage leads to severe degradation of the concrete. GGBS is a common addition to PC composites. It has been demonstrated that GGBS improves the general performance of PC concrete decreasing chloride diffusion and chloride ion permeability; reducing creep and drying shrinkage; increasing sulfate resistance; enhancing ultimate compressive strength and reducing heat of hydration and bleeding. It has also been suggested that GGBS may increase concrete durability in the aggressive environment of silos. In order to investigate this theory, a simulation study was carried out by immersing samples of mortars incorporating increasing amounts of GGBS in a silage effluent solution and a magnesium sulphate solution. Over the course of an experiment consisting of three, 28-day cycles of immersion in the silage effluent, the sample performance was evaluated by testing permeability, porosity, water absorption, capillary suction, compressive strength and mass loss. According to the results obtained, the OPC samples suffered the highest rise in permeability and porosity and the greatest loss in both mass and compressive strength. In addition, the durability of the mortars, when subjected to both salt crystallisation and silage effluent cycles, increased with increasing amounts of GGBS. The significant rise in capillary suction, water absorption and permeability over the course of the experiment indicates that the damage induced by the effluent is not as superficial as previously reported. Loss in mass and increase in permeability were found to be the most reliable indicators of corrosion as they gave the most dramatic and uniform results.

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Section: Introductionmentioning

confidence: 86%

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Pavía

Condren

2008

J. Mater. Civ. Eng.

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“…Studies also indicated that the high volume fly ash with steel fibre incorporated rebar concrete had shown a favorable reduction in the corrosion potential. The thickness of corrosion was identified in the corrosion process for different fly ash substituted concrete [14,15]. The rate of change of strain was measured using strain gauge principle in which the fly ash based fibre reinforced concrete showed lesser corrosion potential and type of mixes.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Effects on the Strength Properties of Steel Fibre Reinforced Concrete Containing Slag and Corrosion Inhibitor

Sivakumar

Sounthararajan

Sengottian

2014

International Journal of Corrosion

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Corrosion in steel can be detrimental in any steel rebar reinforced concrete as well as in the case of steel fibre reinforced concrete. The process of corrosion occurring in steel fibre incorporated concrete subjected to corrosive environment was systematically evaluated in this study. Concrete specimens were prepared with steel fibre inclusions at 1.5%(volume fraction) of concrete and were added in slag based concrete (containing manufactured sand) and replaced with cement at 20%, 40%, and 60% of total binder. Accelerated corrosion studies were carried out using alternate wetting and drying cycle accompanied with initial stress at 40% and 60% of ultimate stress. Concrete specimens were then immersed in chloride-free water and sodium chloride solution (3.5%) after subjecting to initial stress. The alternate wetting and drying process of different concrete mixes was continued for longer exposure (6 months). Later, the strength degradation during the accelerated corrosion process was then assessed in compressive and flexural tests. Test results indicated that the strength degradation was marginal in the case of steel fibre reinforced concrete containing higher slag content and for the concretes containing corrosion inhibitors. The maximum strength reduction was noticed in the case of plain concrete containing steel fibres and, with the slag addition, a considerable reduction in corrosion potential was noticed. Also, with the increase in slag replacement up to 60%, a significant increase in strength was noticed in flexural test. Experimental test results also showed that the corrosion process in steel fibre reinforced concrete can be controlled with the incorporation of corrosion inhibitors in cementitious system.

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“…Por otro lado, cabría destacar que la sustitución de los áridos naturales por áridos reciclados, con niveles de absorción de agua superiores, reduce la relación agua/cemento efectiva de la mezcla [18][19][20][21], con lo que el volumen de la red porosa de la matriz cementante es inferior, resultando en una mejor respuesta del material frente a ataques por medios fluidos. Por ello, se obtuvieron niveles de correlación significativos entre la reducción de radios registrada y el contenido cerámico presente en los áridos (Fig.…”

Section: Figura 1 Equipo De Ensayo De Degradación áCida Aceleradaunclassified

El uso de hormigones reciclados en el sector agroganadero

Juan-Valdés

García-González

Rodríguez-Robles

et al. 2018

Libro De Comunicaciones / Livro Das Comunicações

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RESUMENEl impacto medioambiental ocasionado durante las últimas décadas por el sector de la construcción, ha fomentado su interés por el conocimiento y uso de los materiales reciclados. En el presente estudio se muestran las diferencias de comportamiento existentes entre un hormigón convencional y un hormigón reciclado (50% del árido grueso natural se ha sustituido por árido reciclado mixto) cuando estos son utilizados en el sector agroganadero. Este tipo de ambientes son muy exigentes con los materiales constructivos, ya que la presencia de ácidos orgánicos generados por los efluentes del material ensilado y las excreciones de los animales junto con la abrasión mecánica ejercida por la maquinaria y los propios animales, ocasionan un alto nivel de degradación.Empleando un equipo de ensayo de degradación acelerada implementado en la Universidad de Gante (Bélgica), se han sometido las probetas de hormigón a ciclos de degradación ácida en una mezcla de base acuosa donde se incorporan ácido láctico y ácido acético, con una concentración de 30g/l. Los resultados muestran como el hormigón reciclado presenta una mayor resistencia a los ataques ácidos y mecánicos que pueden darse en un ambiente ganadero, debido al efecto que ejerce el material cerámico sobre la red porosa del hormigón. PALABRAS CLAVE:Ataque ácido, árido reciclado, residuos de construcción y demolición. 1.-INTRODUCCIÓNEl impacto medioambiental ocasionado durante las últimas décadas por el sector de la construcción, teniendo en cuenta tanto la elevada utilización de recursos naturales como la generación de grandes volúmenes de residuos, ha fomentado el interés de dicho sector por el conocimiento y uso de los hormigones reciclados. Este tipo de material proporciona una alternativa capaz de solventar los dos costes ecológicos mencionados anteriormente, ya que el uso de residuos de construcción y demolición en la elaboración de nuevos hormigones . Si a este hecho se le une la buena resistencia que presentan este tipo de materiales constructivos frente a los ataques ácidos, resulta interesante analizar el comportamiento desarrollado por hormigones que incorporen áridos reciclados con contenidos elevados de fracción cerámica en ambientes ácidos, como es el caso del sector agroganadero.Los ambientes agroganaderos son muy exigentes con los materiales constructivos, ya que la presencia de ácidos orgánicos generados por los efluentes del material ensilado y las excreciones de los animales junto con la abrasión mecánica ejercida por los animales y la maquinaria, ocasionan un alto nivel de degradación [3]. El material ensilado que se almacena en silos horizontales de hormigón produce alrededor de 140 l/t de efluentes que contienen ácido acético y láctico, con un valor de pH cercano a 4 [4]. Si se trata de estiércol líquido, este contiene una mezcla de ácidos volátiles como son el acético, el propiónico, el butírico y el isobutírico, con un pH alrededor de 6-8 [5]. Estudios existentes de Bertron et al.[6] sugirieron que el uso de ácido acético es adecuado para recrea...

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Influence of the cement type on the resistance of concrete to feed acids

Cited by 66 publications

References 2 publications

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Study of the Durability of OPC versus GGBS Concrete on Exposure to Silage Effluent

Corrosion Effects on the Strength Properties of Steel Fibre Reinforced Concrete Containing Slag and Corrosion Inhibitor

El uso de hormigones reciclados en el sector agroganadero

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