Round-Robin test on chloride analysis in concrete—Part I: Analysis of total chloride content

Castellote, Marta; Andrade, C

doi:10.1007/bf02482181

Cited by 37 publications

(27 citation statements)

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“…Se perforaron todos los cubos longitudinalmente en fases de 10 mm hasta una profundidad total de 50 mm. El polvo recogido en cada intervalo se guardó en bolsas herméticas de plástico hasta su análisis mediante titulación para determinar su contenido de cloruros (25,26).…”

Section: Test Proceduresunclassified

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Propiedades y durabilidad del cemento con adición de metacaolín: mortero y hormigón

2010

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RESUMENEn este trabajo se estudia el efecto del metacaolín sobre las prestaciones del hormigón. Las probetas curadas a 360 y 90 días se sometieron a ensayos de resistencia a compresión y de tracción indirecta respectivamente. Se hizo un seguimiento de la resistencia a la compresión de los materiales ante el ataque de sales (soluciones de cloruro y de sulfato-cloruro) y, se midió la penetración de cloruros y la capacidad de los hormigones de inmovilizar estos iones. Los resultados se compararon con los obtenidos con hormigones elaborados con cemento pórtland ordinario (OPC) y, con cemento de calor de hidratación moderado (tipo II). El MK resultó influir muy positivamente en la resistencia del hormigón a 28 días debido a la mejora de la microestructura del cemento hidratado. La sustitución de cemento por metacaolín aumentó la resistencia del hormigón al ataque de cloruros. El hormigón con metacaolín demostró ser más duradero en entornos de sulfato-cloruro que los hormigones elaborados con OPC o con cemento de tipo II. Los perfiles de concentración de cloruros a distintas profundidades y la diferencia entre los contenidos de cloruro libre y total, mostraron claramente que el cemento con metacaolín reducía la penetración de cloruros en el hormigón y, aumentaba su capacidad para combinar con iones cloruro. La conclusión general fue que podía fabricarse material puzoláni-co utilizable, mediante la activación térmica del caolín local.Palabras clave: cemento con adiciones, metacaolín, ataque sulfatos-cloruros, penetración cloruros. SUMMARYThis article explores the effect of metakaolin, a pozzolan, on concrete performance. Compressive and splitting tensile strength were found for specimens cured for up to 360 and 90 days, respectively. Changes were recorded in the compressive strength of specimens exposed to salt (chloride and sulfatechloride solutions), and chloride penetration and binding capacity were measured. The findings were compared to the results for concrete prepared with ordinary Portland (OPC) and moderate heat of hydration (Type II) cement. MK was found to have a very positive effect on 28-day concrete strength, due to microstructure improvement of the hydrated cement. Replacing cement with metakaolin effectively raised concrete resistance to chloride attack. Concrete containing metakaolin proved to be substantially more durable in sulfate-chloride environment.Keywords: blended cement, metakaolin, sulfate-chloride attack, chloride penetration. Persona de contacto/Corresponding author: rafikaa65@yahoo.com INTRODUCCIÓNLos materiales puzolánicos como el humo de sílice (HS) y las cenizas volantes (CV) son componentes esenciales del hormigón de altas prestaciones. Cuando se emplean como aditivos minerales en el hormigón de altas prestaciones, pueden mejorar la resistencia y la durabilidad de dicho material. En los últimos años ha crecido el interés por el uso de metacaolín (MK) como adición mineral con este fin (1-3). Sabir y otros (4) y Siddique y Klaushave (5) han publicado recientemente monografías amplias sob...

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Section: Test Proceduresunclassified

“…Each cube was drilled longitudinally in 10-mm stages to a total depth of 50 mm. The powder gathered at each interval was stored in airtight plastic bags until analysed for chloride content by titration (25,26).…”

Section: Calor De Hidrataciónmentioning

confidence: 99%

Propiedades y durabilidad del cemento con adición de metacaolín: mortero y hormigón

2010

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“…A round-robin chloride test was carried out in 30 laboratories and the results of 64 measurements of total chloride content were reported by Castellote and Andrade (2001a). Three methods were used for extracting chlorides from the solid sample and six methods for analysing the solution obtained.…”

Section: Advances In Cement Researchmentioning

confidence: 99%

Chloride in cement

Galán

Glasser

2015

Advances in Cement Research

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Portland cement–steel composites frequently take up chloride from their service environment. The degradation processes and test methods are described through a critical review of the literature. Plain cement paste is not much affected by chloride except for increased solubilisation of cement solids, but chloride is detrimental to the passivation of embedded steel. Emphasis is placed on establishing the underlying physicochemical concepts and mechanisms of corrosion, and integrating these into a holistic picture. Simplistic calculations and test conditions probably do not reproduce well the complex reactions with cement components occurring at the steel–cement interface and the concept of a ‘threshold' – defined in terms of a critical chloride content or chloride:hydroxide ratio – is just an approximation at best: other cement components are involved, as is the oxygen activity at the interface. Chloride binding can retard the migration of chloride in concrete and specimen calculations are presented showing that the main binding mechanism arises from the AFm, [Ca2(Al,Fe)(OH)6].X.nH2O, content of the paste. Suggestions are made to enhance the value of experimental approaches to corrosion.

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“…The chloride ion dosage was carried out according to a potentiometric method using a 0.01 mol/l solution of silver nitrate. The procedure for free chlorides dosage derives from works described in [7]. The quantity of chloride ions was found to be as low as 0.1 g Cl − per 100 g of cement, which is the precision limit of the method due to the low material quantities available.…”

Section: Uhpfrc Feedbackmentioning

confidence: 99%

Examples of feedback, experimental and theoretical approaches for concrete durability assessment

Lion¹,

Pape

Toutlemonde³

et al. 2011

EPJ Web of Conferences

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Abstract. This paper presents some experimental data obtained from UHPFRC (Ultra-High Performance Fibre-Reinforced Concrete) being exposed for 10 years in a cooling tower and a high slag content concrete being exposed for 30 years in a marine environment. Experimental data are then used for assessing concrete durability through a theoretical approach, namely performance-based analysis. The results from the application of this approach are consistent with the penetration depth of aggressive agents measured from core samples. Finally a simulation method currently being developed by EDF is presented, which has great relevance to durability assessment.

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Round-Robin test on chloride analysis in concrete—Part I: Analysis of total chloride content

Cited by 37 publications

References 4 publications

Propiedades y durabilidad del cemento con adición de metacaolín: mortero y hormigón

Propiedades y durabilidad del cemento con adición de metacaolín: mortero y hormigón

Chloride in cement

Examples of feedback, experimental and theoretical approaches for concrete durability assessment

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