Application of Image Analysis to Identify Quartz Grains in Heavy Aggregates Susceptible to ASR in Radiation Shielding Concrete

Jóźwiak–Niedźwiedzka, Daria; Jaskulski, Roman; Glinicki, Michał A.

doi:10.3390/ma9040224

Cited by 13 publications

(7 citation statements)

References 17 publications

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“…[16] showed that almost 90% of all cases with ASR-damaged concrete structures were caused by porous opaline or calcareous opaline flint in the sand fraction. Jóźwiak-Niedźwiedzka et al [17] also confirmed the effectiveness of image analysis to assess the potential for ASR in aggregate. Mortar-bars after accelerated tests were observed on SEM with EDS.…”

Section: Resultsmentioning

confidence: 72%

Microscopic analysis of the alkali-silica reactivity of various origin fine aggregate

et al. 2020

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Alkali silica reaction (ASR) is a harmful phenomenon occurring as a result of chemical interactions between sodium and potassium hydroxides in the pore solution and reactive minerals contained in the aggregate. Reactive minerals like microcrystalline, cryptocrystalline or strained quartz dissolve in the alkaline solution and form an expansive gel product. Proper selection of concrete constituents is necessary to ensure the durability of concrete structures. The proper recognition of the aggregate mineralogical composition is a very important element in the process of selection of concrete components due to the risk of ASR occurrence. This paper presents the results of detailed microscopic analysis of alkali-silica reactivity of domestic fine aggregates of various origins. Six siliceous sands from different locations in Poland and one limestone sand were tested. Detailed petrographic analysis was performed on thin sections. In all siliceous sands micro- and cryptocrystalline quartz was recognized as a reactive mineral. Digital image analysis was performed for quantitative assessment of the potential of reactivity of sands. It revealed, that siliceous river sands were the most susceptible to an alkali-silica reaction, which was confirmed by mortar bar expansion test performed according to the standard test method.

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Section: Resultsmentioning

confidence: 72%

Microscopic analysis of the alkali-silica reactivity of various origin fine aggregate

et al. 2020

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“…Depending on the mean crystal size, the reactive forms of quartz were classified: highly-reactive quartz: <10 μm, reactive quartz: 10–60 μm, uncertain quartz: 60–130 μm, and harmless quartz: >130 μm. A description of the subsequent stages of the individual phases analysis is provided in Jóźwiak-Niedźwiedzka et al [25].…”

Section: Methodsmentioning

confidence: 99%

Alkali-Silica Reactivity of High Density Aggregates for Radiation Shielding Concrete

et al. 2018

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Long-term exposure of concrete to nuclear reactor environments may enhance the ageing phenomena. An investigation concerning a possible deleterious alkali-silica reaction (ASR) in concrete containing high-density aggregates is presented in this paper. The scope of this investigation was limited to heavy aggregates that could be used for the construction of the first Polish nuclear power plant (NPP). Five different high-density aggregates were selected and tested: three barites, magnetite, and hematite. Mineralogical analysis was conducted using thin section microscopic observation in transmitted light. The accelerated mortar beam test and the long-time concrete prism test were applied to estimate the susceptibility of heavy aggregates to ASR. X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses were conducted on aggregates and mortars. The quartz size in aggregate grains was evaluated using image analysis. Application of the accelerated mortar beam method confirmed the observations of thin sections and XRD analysis of high-density aggregates. The microcrystalline quartz in hematite aggregate and cristobalite in one of barite aggregate triggered an ASR. The composition of ASR gel was confirmed by microscopic analysis. The long-term concrete test permitted the selection of innocuous high-density aggregates from among the other aggregates available, which showed practically no reactivity.

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“…Thin section image acquisition was performed using an Olympus BX51 microscope in cross-polarized light (XPL) with λ plate. The λ plate is a first-order red plate which consists of a quartz or gypsum plate that is cut parallel to the optic axis, about 62 μm thick, which shows a first-order red interference color in diagonal position [8].…”

Section: Testing Methods-the Microstructure Analysismentioning

confidence: 99%

Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy

Żołek

Ranachowski

et al. 2017

Archives of Metallurgy and Materials

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Two different barite ore (barium sulfate BaSO 4 ) specimens from different localizations were tested and described in this paper. Analysis of the microstructure was performed on polished sections, and on thin sections using X-ray microtomography (micro-CT), and optical microscopy (MO). Microtomography allowed obtaining three-dimensional images of the barite aggregate specimens. In the tomograms, the spatial distribution of the other polluting phases, empty space as well as cracks, pores, and voids -that exceeded ten micrometers of diameter-were possible to visualize. Also, the micro-CT allowed distinguishing between minerals of different density, like SiO 2 and BaSO 4 . Images obtained and analyzed on thin sections with various methods using the optical microscopy in transmitted light delivered additional information on the aggregate microstructure, i.e. allow for estimation of the different kinds of inclusions (like the different density of the minerals) in the investigated specimens. Above methods, which were used in the tests, completed each another in order to supply a set of information on inclusions' distribution and to present the important differences of the barite aggregate specimens microstructure.

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Application of Image Analysis to Identify Quartz Grains in Heavy Aggregates Susceptible to ASR in Radiation Shielding Concrete

Cited by 13 publications

References 17 publications

Microscopic analysis of the alkali-silica reactivity of various origin fine aggregate

Microscopic analysis of the alkali-silica reactivity of various origin fine aggregate

Alkali-Silica Reactivity of High Density Aggregates for Radiation Shielding Concrete

Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy

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