Durability of Blended Cements Made with Reactive Aggregates

Menéndez, Esperanza; Sanjuán, Miguel Ángel; García-Rovés, Ricardo; Argiz, Cristina; Recino, Hairon

doi:10.3390/ma14112948

Cited by 8 publications

(6 citation statements)

References 25 publications

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“…This finding was also similar to that of [23] when they assessed the effect of four kinds of pozzolans -blast-furnace slag, natural pozzolan, silica fume and siliceous coal fly ash -on Alkali-silica reaction elimination in concrete. Based on their findings, the mortars containing cement-pozzolan blends exhibited lower open porosities when compared with the control mortars.…”

Section: Introductionsupporting

confidence: 82%

Effects of Bamboo Leaf Ash on Alkali-Silica Reaction in Concrete

Ikumapayi

JEGEDE

2023

Journal of Sustainable Construction Materials and Technologies

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The construction industry is generally faced with so many challenges of which deterioration in concrete structures due to the Alkali-silica reaction (ASR) is one of the pressing challenges. This reaction causes expansion in concrete, leading to the eventual cracking of such concrete structure and its subsequent failure. Research direction is being geared towards obtaining properties of pozzolanic concrete of recently discovered different biogenic pozzolans such as bamboo leaf ash (BLA). BLA has been proven to be acceptable in terms of compressive strength and some other properties but few researches have been carried out on the effects of ASR on BLA concrete structures. This research work focuses on investigating the properties of BLA through X-ray diffraction and fluorescence analyses, and its effectiveness in resisting or eliminating ASR that may be present in concrete. Tests were performed on concrete bars soaked in NaOH at a temperature of 80oC to determine the potential reactivity of aggregates to ASR. In addition, workability and the compressive strengths of BLA concrete at different percentage levels were determined after curing for 7, 28 and 56 days. The findings of the research show that BLA improves the workability of fresh concrete, however, it causes a decline in the compressive strength of concrete when compared with the strength of conventional concrete. Also, bamboo leaf ash has no detrimental effect on the linear expansion of concrete. This study recommends that a 5% partial replacement of cement with Bamboo leaf ash will give effective performance when used in areas where strength is not the major priority.

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Section: Introductionsupporting

confidence: 82%

Effects of Bamboo Leaf Ash on Alkali-Silica Reaction in Concrete

Ikumapayi

JEGEDE

2023

Journal of Sustainable Construction Materials and Technologies

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“…Por otro lado, no deberían emplearse porcentajes mayores al 6% en los diseños de mezcla de hormigón porque siendo así tenderían a perder su resistencia, en cambio para un hormigón con porcentaje inferior al 3% su resistencia es aproximadamente la misma del hormigón ordinario (Menéndez et al 2021). La muestra de los aglomerados del hormigón con un contenido de CDC del 5 %, alcanzan una mayor resistencia después de los 28 días, por consiguiente, tienen la posibilidad ayudar a elevar las resistencias a edades tempranas (Ibrahim et al 2019).…”

Section: Resultados Y Discusiónunclassified

“…Influencia del CDC en la trabajabilidad del concreto Integraron CDC en el concreto, disminuyendo la trabajabilidad a medida que la cantidad de ceniza aumenta; del mismo modo, la alta trabajabilidad es cuando la CDC es añadida en la mezcla en el rango de 10-30%: la pérdida de agua que estaba destinada a facilitar el movimiento de las partículas de la mezcla podría deberse a la absorción de la ceniza que es una propiedad inherente de ella y que es rica en poros vacíos (Muthusamy et al 2020). Esto lleva a aumentar la fuerza de fricción que reduce la trabajabilidad de la mezcla, las propiedades físicas de la ceniza con su comportamiento entrelazado, forma irregular y textura de superficie rugosa también son otra causa que reduce la trabajabilidad de la mezcla; la incorporación del CDC a un tamaño de partícula inferior a 300 mm reduce la trabajabilidad debido a su mayor superficie en comparación con la arena (Menéndez et al 2021). El uso de CDC de superficie saturada como reemplazo de arena tiende a mejorar la trabajabilidad.…”

Section: Propiedades Físicasunclassified

Uso de cenizas de carbón para mejorar la resistencia a la compresión del concreto

Llamo¹,

Avellaneda²,

Pérez³

et al. 2021

Nor@ndina

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Las cenizas de carbón son contaminantes ambientales, sin embargo, son utilizadas como aditivo en el cemento para la elaboración de hormigón, en obras de ingeniería civil. Se tuvo por objetivo evaluar información del uso de cenizas de carbón en la optimización de la resistencia del hormigón. Se realizó análisis de 61 artículos científicos de actualidad, identificando así informaciones referentes al uso de cenizas de carbón para mejorar la resistencia a la compresión del concreto. Se determinó que la resistencia promedio del hormigón habitual a los 28 días fue de 221 kg/cm2, con 2,5% de cenizas fue de 223 kg/cm2, con 5% fue de 231 kg/cm2, con 10% fue de 200 kg/cm2 y con el 15 % fue de 192 kg/cm2 respectivamente. Las cenizas de carbón usadas en proporciones menores al 10% en sustitución de cemento, mejora la resistencia del hormigón; en contraste, el uso superior al 10% puede disminuir la calidad del hormigón.

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“…The requirements of sustainability imply, not only the appropriate use of natural resources, but also the design of structures with adequate mechanical properties and durability [ 1 ]. Both strength and durability are strongly linked to a tight, nonpermeable microstructure.…”

Section: Introductionmentioning

confidence: 99%

Transition Zone Enhancement with Waste Limestone Powder as a Reason for Concrete Compressive Strength Increase

2021

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Modification of concrete with waste materials is an increasingly common process, and they are primarily used as a partial substitution for cement. In the case of inert or nearly inert additions according to EN 206, the effectiveness of such a modification mainly concerns ecological aspects and, only to a small extent, mechanical properties. This article analyses the effect of modifying cement concrete with waste limestone powder as a partial substitution for fine aggregate. The analysed waste arises as a result of the accumulation of dust produced during the initial preparation of aggregate for the production of hot mix asphalt (HMA). In order to analyse the effect of waste on compressive strength, an experimental design was prepared with variable substitution levels and variable water/cement ratios. Compressive strength tests were performed after 28 to 90 days. Statistical analysis of the results was performed. Microscopic evaluation of the fractures of the samples was carried out to clarify the mechanism of transition zone enhancement, which resulted in an increase of compressive strength of the composite.

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Durability of Blended Cements Made with Reactive Aggregates

Cited by 8 publications

References 25 publications

Effects of Bamboo Leaf Ash on Alkali-Silica Reaction in Concrete

Effects of Bamboo Leaf Ash on Alkali-Silica Reaction in Concrete

Uso de cenizas de carbón para mejorar la resistencia a la compresión del concreto

Transition Zone Enhancement with Waste Limestone Powder as a Reason for Concrete Compressive Strength Increase

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