Petrographic identification of alkali–silica reactive aggregates in concrete from 20th century bridges

Lukschová, Šárka; Přikryl, Richard; Pertold, Zdeněk

doi:10.1016/j.conbuildmat.2008.02.020

Cited by 33 publications

(15 citation statements)

References 37 publications

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“…The reaction was first identified by Stanton [14] in the concrete element of a bridge. Lukschová et al [15] reported concrete defects in 13 bridges due to the swelling of the ASR gel product. The bridge concrete was produced with coarse basalt, granite and diorite aggregates.…”

Section: Literature Surveymentioning

confidence: 98%

“…The gel formed as a result of the reaction with the grains of quartzite, monomineral quartz or greywacke present in fine aggregates. The basalt, granite and diorite aggregates did not react with alkali [15]. Shayan and Lancucki [16] reported ASR of the apparently non-reactive granite aggregate slowly progressing in the concrete of the bridge.…”

Section: Literature Surveymentioning

confidence: 99%

See 1 more Smart Citation

Properties and durability of coarse igneous rock aggregates and concretes

Piasta

Góra

Turkiewicz

2016

Construction and Building Materials

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Section: Literature Surveymentioning

confidence: 98%

Section: Literature Surveymentioning

confidence: 99%

Properties and durability of coarse igneous rock aggregates and concretes

Piasta

Góra

Turkiewicz

2016

Construction and Building Materials

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“…Fabricius et al 33 and Ehrenberg et al 34 ) pore analysis (Cerepi et al 35 ), investigation of cement-based materials (Felekoglu 36 ) and identification of mechanisms of concrete degradation (Wakimoto et al 37 and Lukschová et al). 38 The approach used in mortar-bar investigation ( Figure 1) consists of image acquisition (thin section microphotographs by digital camera), detection of grain (clast) boundaries, identification of phases and final image processing by appropriate software (SIGMASCAN Pro, Jandel Scientific, USA).…”

Section: Optical Microscopy Of Thin Sections From Mortar-bar Test Spementioning

confidence: 99%

Evaluation of the alkali–silica reactivity potential of sands

Lukschová¹,

Přikryl²,

Pertold³

2009

Magazine of Concrete Research

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The alkali-silica reactivity potential of 20 different Quaternary natural aggregates (sands and gravels) from the Czech Republic has been evaluated by petrographic and dilatometric methods. Petrographic techniques, both qualitative (optical and scanning electron microscope (SEM)/energy dispersive spectrometer (EDS) microscopy of thin sections) and quantitative (petrographic image analysis of thin sections), have been applied for the disused specimens. The dilation of the mortar-bar test specimens (according to ASTM C1260) ranged nine samples to the non-reactive, nine samples to reactive and two samples to potentially reactive categories. These categories, based on the dilation values, do not however satisfactorily correlate to the volumes of individual groups of aggregates identified petrographically in mortar-bars. More detailed petrographic examination showed the subdivision according to the presence/absence of deformation sings inhibitors and/or grain size. These results show that the optical microscopy of mortar-bar specimens provides detailed identification of alkali reactive samples according to their spatial relationship with ASR products. The same approach also allows direct identification of gels and alkalisilica reactive fragments.

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“…However, particles frequently cause expansion or cracks after backfilling [8][9][10]. According to the expansion effect of alkali-silica reactions (ASR), the range of aggregate sizes causing the highest ASR expansion apparently varies with the nature and composition of the aggregates [11]. Poyet studied the effect of various reactive size fractions [12], finding that extremely fine fractions do not cause expansion.…”

Section: Introductionmentioning

confidence: 99%