Cathodoluminescence microscopy and petrographic image analysis of aggregates in concrete pavements affected by alkali–silica reaction

Šťastná, Aneta; Šachlová, Šarka; Pertold, Zdeněk; Přikryl, Richard; Leichmann, Jaromı́r

doi:10.1016/j.matchar.2012.01.008

Cited by 8 publications

(4 citation statements)

References 29 publications

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“…The highest ASR potential, as well as the highest content of cryptocrystalline matrix (and most fine-grained quartz) was found in the chert sample. The higher reactivity of the chert matrix (compared to parts of well-crystallized quartz) was detected in aggregates of mortar bars (Šachlová et al, 2015). The high reactivity of sample No.…”

Section: Disscussionmentioning

confidence: 99%

“…Cathodoluminescence (CL) characterization is another useful microscopy technique that provides information unavailable by other analytical methods. Concerning ASR, the chemical composition, mineral phases, and structure of the aggregates (especially of quartz varieties, which are the most important phases for ASR) are rarely examined by means of a CL study (Götze, 2009a;Šťastná et al, 2012, 2015. CL microscopy was employed to characterize quartz origin on the basis of the various CL colors of the quartz grains (e.g., Ramseyer et al, 1988;Götze & Zimmerle, 2000;Boggs et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Microscopy and Cathodoluminescence Spectroscopy Characterization of Quartz Exhibiting Different Alkali–Silica Reaction Potential

et al. 2016

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Different quartz types from several localities in the Czech Republic and Sweden were examined by polarizing microscopy combined with cathodoluminescence (CL) microscopy, spectroscopy, and petrographic image analysis, and tested by use of an accelerated mortar bar test (following ASTM C1260). The highest alkali-silica reaction potential was indicated by very fine-grained chert, containing significant amounts of fine-grained to cryptocrystalline matrix. The chert exhibited a dark red CL emission band at ~640 nm with a low intensity. Fine-grained orthoquartzites, as well as fine-grained metamorphic vein quartz, separated from phyllite exhibited medium expansion values. The orthoquartzites showed various CL of quartz grains, from blue through violet, red, and brown. Two CL spectral bands at ~450 and ~630 nm, with various intensities, were detected. The quartz from phyllite displayed an inhomogeneous dark red CL with two CL spectral bands of low intensities at ~460 and ~640 nm. The massive coarse-grained pegmatite quartz from pegmatite was assessed to be nonreactive and displayed a typical short-lived blue CL (~480 nm). The higher reactivity of the fine-grained hydrothermal quartz may be connected with high concentrations of defect centers, and probably with amorphized micro-regions in the quartz, respectively; indicated by a yellow CL emission (~570 nm).

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Section: Disscussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microscopy and Cathodoluminescence Spectroscopy Characterization of Quartz Exhibiting Different Alkali–Silica Reaction Potential

et al. 2016

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“…Further, the chemical composition of RCAs has not been researched extensively [6,8], which makes it challenging to achieve a standardized procedure for their use [12]. On the other hand, studies highlight the importance of applying image analysis to determine aspects such as residual mortar after the use of RCAs in concrete mixtures, estimation of porosity distribution, and degradation characteristics within concrete [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

The Chemical-Mineralogical Characterization of Recycled Concrete Aggregates from Different Sources and Their Potential Reactions in Asphalt Mixtures

et al. 2020

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The incorporation of a recycled concrete aggregate (RCA) as a replacement of natural aggregates (NA) in road construction has been the subject of recent research. This tendency promotes sustainability, but its use depends mainly on the final product’s properties, such as chemical stability. This study evaluates the physical and chemical properties of RCAs from two different sources in comparison with the performance of NA. One RCA was obtained from the demolition of a building (recycled concrete aggregate of a building—RCAB) and another RCA from the rehabilitation of a Portland cement concrete pavement (recycled concrete aggregate from a pavement—RCAP). Characterization techniques such as X-ray fluorescence (XRF), X-ray diffraction (XRD), UV spectroscopy, and atomic absorption spectrometry were used to evaluate the RCAs’ coarse fractions for chemical potential effects on asphalt mixtures. NA was replaced with RCA at 15%, 30%, and 45% for each size of the coarse fractions (retained 19.0, 12.5, 9.5, and 4.75 sieves in mm). The mineralogical characterization results indicated the presence of quartz (SiO2) and calcite (CaCO3) as the most significant constituents of the aggregates. XFR showed that RCAs have lower levels of CaO and Al2O3 concerning NA. Potential reactions in asphalt mixtures by nitration, sulfonation, amination of organic compounds, and reactions by alkaline activation in the aggregates were discarded due to the minimum concentration of components such as NO2, (–SO3H), (–SO2Cl), and (Na) in the aggregates. Finally, this research concludes that studied RCAs might be used as replacements of coarse aggregate in asphalt mixtures since chemical properties do not affect the overall chemical stability of the asphalt mixture.

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“…In the early of 20 th century, photographic techniques were used in construction materials to evaluate their components and deterioration mechanisms [7]. Petrographic image analysis is used in various applications like assessment of firedamaged concrete [8], determination of alkali-silica reaction in aggregates of concrete pavement [9], study of leaching of cement paste in concrete [10], verification of materials formation in a reaction [11] and etc. Petrographic image analysis is widely used in evaluation of aggregate alkali reactivity [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Application of petrographic image analysis in assessment of chemical attack in the concrete segments of a tunnel

et al. 2018

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The current paper discusses the petrographic image analysis performed on core specimens that are extracted from a tunnel in the south west of Iran. During tunnel excavation, damages were observed in the inner sections of concrete segments. Due to field observations of damaged segments, environmental parameters and tunnel location, several damage scenarios were proposed. In order to assess damage mechanisms, 69 cores were extracted and a number of standard tests were carried out. Since chemical attacks alter microscopic properties of materials, petrographic image analysis was performed on five of the specimens to evaluate possible microscopic changes in concrete composition.The results show that petrographic image analysis is an efficient method to provide a profound insight into the effects of chemical attacks on concrete members.

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Cathodoluminescence microscopy and petrographic image analysis of aggregates in concrete pavements affected by alkali–silica reaction

Cited by 8 publications

References 29 publications

Microscopy and Cathodoluminescence Spectroscopy Characterization of Quartz Exhibiting Different Alkali–Silica Reaction Potential

Microscopy and Cathodoluminescence Spectroscopy Characterization of Quartz Exhibiting Different Alkali–Silica Reaction Potential

The Chemical-Mineralogical Characterization of Recycled Concrete Aggregates from Different Sources and Their Potential Reactions in Asphalt Mixtures

Application of petrographic image analysis in assessment of chemical attack in the concrete segments of a tunnel

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