Alkali-aggregate behaviour of alkali-activated slag mortars: Effect of aggregate type

Puertas, Francisca; Palacios, Marta; Gil-Maroto, A.; Vázquez, T.

doi:10.1016/j.cemconcomp.2009.02.008

Cited by 76 publications

(20 citation statements)

References 21 publications

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“…These results were confirmed by morphological analysis of the reaction products formed in the bars after expansion. The SEM images and semi-quantitative chemical analysis by EDS (Figure 10) revealed the formation of AAR products in the pores of a bar fragment produced with sample C, with morphology and composition (in terms of Si, Na, K, and Ca) in accordance with previous work 6, 24 . Images of the interior of the mortar bars produced with samples A and B mainly showed pores that were empty (Figure 11), or that were filled with products of the hydration of cement, such as hexagonal crystals of portlandite (Ca(OH) 2 ) (Figure 12).…”

Section: Resultssupporting

confidence: 54%

Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction

et al. 2014

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The alkali-aggregate reaction (AAR) in concrete structures is a problem that has concerned engineers and researchers for decades. This reaction occurs when silicates in the aggregates react with the alkalis, forming an expanded gel that can cause cracks in the concrete and reduce its lifespan. The aim of this study was to characterize three coarse granitic aggregates employed in concrete production in northeastern Brazil, correlating petrographic analysis with the kinetics of silica dissolution and the evolution of expansions in mortar bars, assisted by SEM/EDS, XRD, and EDX. The presence of grains showing recrystallization into individual microcrystalline quartz subgrains was associated with faster dissolution of silica and greater expansion in mortar bars. Aggregates showing substantial deformation, such as stretched grains of quartz with strong undulatory extinction, experienced slower dissolution, with reaction and expansion occurring over longer periods that could not be detected using accelerated tests with mortar bars.

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Section: Resultssupporting

confidence: 54%

Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction

et al. 2014

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“…RQPA has been employed to study the aggregates with the final aim to understand these reactions (Grattan-Bellew et al 2010). Furthermore, this technique has also been employed, plus other characterization tools, to study the alkali-aggregate reaction in OPC and waterglass-alkaliactivated slag mortars (Puertas et al 2009). …”

Section: Durability Studiesmentioning

confidence: 99%

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

Aranda

Torre

León‐Reina

2012

Reviews in Mineralogy and Geochemistry

130

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“…The temperature rise of LSSC is lower than that of HSSC which is caused by the less content of cementitiousmaterial. (4) The main hydration products are scale-like C-S-H( ) and short cylindrical or needle-like ettringite, which is much different with the OPA system with much Ca(OH) 2 produced. The system becomes denser with time as the silicon-calcium ratio of C-S-H changes and the scale size of C-S-H becomes larger.…”

Section: Discussionmentioning

confidence: 99%

“…With good properties and simple manufacturing technique and low cost, SSC is a kind of energy conservation and environmental friendly cement. Contrary to the ordinary cement, SSC has the advantage of lower heat of hydration [1] , control thealkali aggregate reaction (AAR) because of the higher content of granulated blast furnace slag that is useful to restrain AAR [2][3] and good sulfate resistance.…”

Section: Introductionmentioning

confidence: 99%

The Use of Supersulfated Cement(SSC)in Mass Concrete

Shu¹,

Xiong³

et al. 2016

MATEC Web Conf.

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Abstract.This paper isfocused on the use of Supersulfated Cement (SSC) in mass concrete. The physicalproperties and mechanicalproperty was tested. Contrast with the common cement, this paper studied the temperature rise of hydration and the heat of hydration to obtain the advantage of SSC, which will provide the basis for the use of SSC in mass concrete.The micro properties were tested through Scanning Electron Microscope (SEM). The test shows that the SSC shows better workingperformance than ordinary cement. The compressive strength of SSC under standard curing condition is higher than that under room curing condition. The compressive strength of SSC is increasing with time and the rate of increasing is decreasing. The temperature rise of hydration of SSC are lower than that of ordinary cement. Different with the ordinary cement, the main hydrated products of SSC areettringite and scalycalcium silicate hydrate.

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Alkali-aggregate behaviour of alkali-activated slag mortars: Effect of aggregate type

Cited by 76 publications

References 21 publications

Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction

Influence of granitic aggregates from northeast Brazil on the alkali-aggregate reaction

Rietveld Quantitative Phase Analysis of OPC Clinkers, Cements and Hydration Products

The Use of Supersulfated Cement(SSC)in Mass Concrete

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