Laboratory assessment of alkali contribution by aggregates to concrete and application to concrete structures affected by alkali–silica reactivity

Bérubé, Marc-André; Duchesne, Josée; Dorion, J.F.; Rivest, Michel

doi:10.1016/s0008-8846(02)00766-4

Cited by 124 publications

(76 citation statements)

References 7 publications

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“…Controlling the alkali content in the cement may not always be effective, especially when there is an external supply, for example from de-icing salts or when alkalis are derived from the aggregates themselves [4]. Many mixture designers recommend the use of supplementary cementing material (SCM's) admixtures such as ground granulated blast furnace slag (ggbfs), pulverised fly ash (pfa), Silica fume or metakaolin, as an alternative to or in combination with, the use of low alkali cement.…”

Section: Introductionmentioning

confidence: 99%

The effects of lithium hydroxide solution on alkali silica reaction gels created with opal

Mitchell

Beaudoin

Grattan-Bellew

2004

Cement and Concrete Research

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.cemconres. 2003.10.011 Cement and Concrete Research, 34, 4, pp. 641-649, 2004-04-01 The Effects of lithium hydroxide solution on alkali silica reaction gels created with opal Mitchell, L. D.; Beaudoin, J. J.; Grattan-Bellew, P. E. AbstractThe reaction of Nevada opal with calcium hydroxide, potassium and lithium hydroxide solutions was investigated. In addition opal was exposed to a combined solution of these three hydroxides.The progress of the three reactions was followed using X-ray Diffraction (XRD),

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Section: Introductionmentioning

confidence: 99%

The effects of lithium hydroxide solution on alkali silica reaction gels created with opal

Mitchell

Beaudoin

Grattan-Bellew

2004

Cement and Concrete Research

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“…Nevertheless, to the author's knowledge, there is no historical reported evidence for alkali-silica reactivity in concrete carried out in the CI mixing these aggregates with blended cements with high percentage of Natural Pozzolan of volcanic origin (11). The reasons of this behaviour are well known, because to initiate and sustain alkali-aggregate reactions in concrete three conditions must be accomplished: (1) aggregates potentially reactive; han de darse simultáneamente tres condiciones: (1) que los áridos sean potencialmente reactivos; (2) elevada concentración de álcalis en solución en los poros del hormigón; y (3) elevadas condiciones de humedad (12). La tercera condición no es corriente en las IC, ya que su clima es más bien templado, marino y predominantemente seco, no es un clima húmedo.…”

Section: Discussionunclassified

“…Melián et al (2) high alkali concentration in the concrete pore solution; and (3) high humidity conditions (12). The third condition is not co mmon in the CI as its weather is rather mild, marine and predominantly dry climate; there is not a humid climate.…”

Section: Conclusionesmentioning

confidence: 99%

Aumento de la tenacidad de hormigones autocompactables reforzados con fibras cortas de polipropileno

Melián¹,

Barluenga²,

Olivares³

2010

Mater. construcc.

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“…Hypotheses on the alkali contribution from natural aggregates (NA) into cement paste have been investigated by a number of researchers (Bérubé et al, 2002;Rajabipour et al, 2015). It has been suggested that alkali release from non-reactive aggregates can be sufficient to influence concrete prism test results (Ideker et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Chemical aspects related to using recycled geopolymers as aggregates

Chaliasou

Heath

Paine

et al. 2018

Advances in Cement Research

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Despite extensive research into sustainability of geopolymers, end-of-life aspects have been largely overlooked. A recycling scenario is examined in this study. This requires an investigation of alkali leaching potential from a geopolymeric matrix. To study the feasibility of geopolymer cement (GPC) recycling, the migration of alkalis was evaluated for the first time on a microstructural level through energy dispersive X-ray (EDX) scanning electron microscopy (SEM) elemental mapping and leaching tests. Macroscale impacts were assessed through an investigation of Portland cement (PC) mortar properties affected by alkali concentration. Leaching tests indicated that alkalis immediately become available in aqueous environments, but the majority remain chemically or physically bound in the matrix. This type of leaching accelerates the initial setting of PC paste. Elemental mapping and EDX/SEM analysis showed a complex paste-aggregate interfacial transition zone. Exchange of calcium and sodium, revealed by the maps, resulted in the migration of sodium into the PC paste and the formation of additional calcium-silicon-based phases in the geopolymeric matrix. Strength values of mortars with 25% and 50% recycled aggregates (RA) showed negligible differences compared with the reference sample. Screening tests indicated a low potential for GPC RA inducing alkali-silica reaction. Transport of GPC RA alkalis and the underlying mechanisms were observed. This transport phenomenon was found to have minor effects on the properties of the PC mortar, indicating that recycling of geopolymers is a viable reuse practice.

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Laboratory assessment of alkali contribution by aggregates to concrete and application to concrete structures affected by alkali–silica reactivity

Cited by 124 publications

References 7 publications

The effects of lithium hydroxide solution on alkali silica reaction gels created with opal

The effects of lithium hydroxide solution on alkali silica reaction gels created with opal

Aumento de la tenacidad de hormigones autocompactables reforzados con fibras cortas de polipropileno

Chemical aspects related to using recycled geopolymers as aggregates

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