Alkali silica reaction in mortar formulated from self-compacting high performance concrete containing rice husk ash

Le, Ha Thanh; Siewert, Karsten; Ludwig, Horst‐Michael

doi:10.1016/j.conbuildmat.2015.04.005

Cited by 54 publications

(18 citation statements)

References 20 publications

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“…On the other hand, Le, Siewert and Ludwig (2015), when studying the RHA with three particle sizes (5.7μm, 7.7μm and 15.6μm) concluded that smaller particle sizes led to reduced expansion, because a more intense pozzolanic reaction occurs, which absorbs more alkaline ions and refines the pore structure. The same researchers studied the effect of RHA with an innocuous aggregate and verified that the samples produced with RHA generated expansions, even surpassing the control sample, in proportion to the particle size of the material, that is, the coarser the particle, the greater the expansion.…”

Section: Introductionmentioning

confidence: 99%

“…Considering that the amorphism grade of a material indicates its potential reactivity, the control of temperature in the calcination process is important. When evaluating the chemical contribution of RHA incorporated in cementitious matrices, several studies (SILVEIRA, 2007;MADANDOUST et al, 2011;ZAIN et al, 2011;JAMIL et al, 2013) have observed that typically there is an increase in the compressive strength over time in relation to the control samples. The benefits are associated with the formation of secondary C-S-H, in addition to the filler effect, which promotes pore filling and pore refinement.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the use of pozzolanic materials for AAR mitigation has been studied by different authors, such as Glasser (1992), Hasparyk (1999), Munhoz (2007), Chappex and Scrivener (2012a), Afshinnia and Rangaraju (2015), Le, Siewert and Ludwig (2015), Adorno et al (2018), and others. Although the benefits attributed to pozzolans are related to calcium hydroxide consumption and secondary calcium silicate hydrate formation, there are still controversies found in the literature.…”

Section: Introductionmentioning

confidence: 99%

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Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation

et al. 2019

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Pozzolans rich in silica, such as Rice Husk Ash (RHA), contribute to compressive strength gain but at the same time might increase alkali-aggregate reaction (AAR) in mortar mixtures. Pozzolans that have aluminates, such as Fired Clay Brick Waste (FCW), can be efficient to mitigate AAR but tend to lead to a slower compressive strength development. The association of different types of pozzolans, however, may result in a synergistic effect, compensating individual deficiencies. This paper presents a study of mixtures containing RHA, FCW and these two materials combined, aiming to obtain benefits in the mechanical behavior and in the durability regarding AAR. A substitution rate of 20% Portland cement by pozzolanic material was used. Through accelerated AAR tests and compressive strength measurements, it was found that while RHA is considered harmful to AAR - even when using an innocuous aggregate - FCW presents benefits, also avoiding this deleterious effect when combined with RHA. The same occurs in the compressive strength development, where RHA compensates a small loss of compressive strength associated with the use of FWC alone.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation

et al. 2019

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“…Hence the study of physical transformations in the concrete after being exposed to higher temperatures becomes important. Self-compacting concrete usage has increased multifold in the past few decades due to its higher strength variations than conventional concrete [18]. Recent decades focused on the temperature studies on self-compacting concrete [19,20,21,22] and mortar due to the significance of mortar properties of self-compacting concrete since it contains less aggregate [23,24].…”

Section: Introductionmentioning

confidence: 99%

Performance of Nano-Silica Modified Self-Compacting Glass Mortar at Normal and Elevated Temperatures

Natarajan

Udayabanu²,

Ponnan

et al. 2019

Materials

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This research aims to combine the effects of nanosilica and glass powder on the properties of self-compacting mortar at normal and at higher temperatures. The fine aggregate was replaced by waste glass powder at various percentage levels of 10%, 20%, 30%, 40% and 50%. The mechanical properties of self-compacting glass mortar (SGCM) were studied at elevated temperatures of 200, 400, 600 and 800 °C. Furthermore the effect of sudden and gradual cooling technique on the residual strength of glass mortar was also investigated In order to enhance the behavior of SCGM the nanosilica of 3% by weight of cement was added. From the results it was obtained that the glass powder replacement effectively contributed towards the thermal performance while the addition of nanosilica enhanced the mechanical performance. The enhanced physical properties were obtained mainly at the glass transition temperature thus showing the active participation of glass powders during high temperatures. Moreover the gradually cooled specimens exhibited improved strength characteristics than the suddenly cooled specimens.

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“…También ha sido usada como material puzolánico que suministra la microestructura en la zona interfacial entre la pasta de cemento y el agregado en concretos de autocompactación, generando efectos positivos en la resistencia mecánica, a edades superiores a 60 días [7], [8].…”

Section: Introductionunclassified

La ceniza de cascarilla de arroz y su efecto en adhesivos tipo mortero

Galeano

León

Piñeros

2016

Avances

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ResumenEn este estudio se presenta una caracterización de la ceniza de cascarilla de arroz a un tamaño de partícula adecuado para su desempeño como agregado fino en adhesivos tipo mortero para colocación de baldosas cerámicas, debido al alto porcentaje de sílice en su composición química. Se analizan las propiedades físicas y químicas de los agregados y el comportamiento mecánico de fluidez y resistencia a la tracción de los morteros obtenidos con reemplazo parcial de arena en porcentajes desde 5% hasta 25%, proponiendo así el empleo de los residuos de ceniza de cascarilla de arroz y presentando una alternativa de disminución a la explotación de arena, la cual genera impactos graves al medio ambiente. Los resultados muestran que un porcentaje de reemplazo de la arena por ceniza de cascarilla de arroz de 20% produce fuerzas de tracción comparables con las obtenidas para adhesivos comerciales. Palabras claveAdhesivos tipo mortero, Arena, Cantera, Ceniza de cascarilla de arroz, Residuos sólidos. AbstractThis research presents a characterization of rice husk ash to an appropriate particle size for their performance as fine aggregate in adhesive mortars for laying of ceramic tiles, due to the high percentage of silica in its chemical composition. The physical and chemical properties of aggregates are analyzed and the mechanical behavior of fluency and tensile strength of the mortars obtained with partial replacement of sand in percentages from 5% to 25%, proposing the use of waste rice husk ash and presenting an alternative to decreasing sand exploitation, which causes serious environmental impacts. The results show that a percentage of replacement of the sand by rice husk ash in a 20% produces tensile forces comparable with those obtained for commercial adhesives.

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Alkali silica reaction in mortar formulated from self-compacting high performance concrete containing rice husk ash

Cited by 54 publications

References 20 publications

Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation

Synergistic effect of RHA and FCW in alkali-aggregate reaction mitigation

Performance of Nano-Silica Modified Self-Compacting Glass Mortar at Normal and Elevated Temperatures

La ceniza de cascarilla de arroz y su efecto en adhesivos tipo mortero

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