Petrography study of two siliceous limestones submitted to alkali-silica reaction

Monnin, Y.; Dégrugilliers, P.; Bulteel, D.; Garcia-Diaz, E.

doi:10.1016/j.cemconres.2006.03.025

Cited by 19 publications

(9 citation statements)

References 6 publications

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“…Under alkaline conditions where POSS-PMMA was hydrolyzed, the silicon-dioxide structure of POSS was reported to be sensitive and labile, [ 29,30 ] and the joint ester group connecting POSS and PMMA segments could also be hydrolyzed and broken. Under alkaline conditions where POSS-PMMA was hydrolyzed, the silicon-dioxide structure of POSS was reported to be sensitive and labile, [ 29,30 ] and the joint ester group connecting POSS and PMMA segments could also be hydrolyzed and broken.…”

Section: Conformation Of Poss-pmma and H-poss-pmma In Solutionmentioning

confidence: 99%

“…The molecular property and conformation of POSS-PMMA and H-POSS-PMMA in chloroform were investigated by DLS and SLS. Under alkaline conditions where POSS-PMMA was hydrolyzed, the silicon-dioxide structure of POSS was reported to be sensitive and labile, [ 29,30 ] and the joint ester group connecting POSS and PMMA segments could also be hydrolyzed and broken. These two factors may lead to the undesired degradation of POSS-PMMA molecules into separate PMMA segments.…”

Section: Conformation Of Poss-pmma and H-poss-pmma In Solutionmentioning

confidence: 99%

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Synthesis and Interfacial Properties of Optically‐Active Photonic Nanocomposites with Single Nanoparticle Dispersion at High Solids Loading

Zhao

Sun

et al. 2016

Adv Materials Inter

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earth elements, trivalent erbium ions (Er 3+ ) are of great interest because their emission of ≈1530 nm falls within the low loss telecommunication window of 1300-1650 nm. [ 9 ] Er 3+ ions are typically incorporated within conventional ceramic optical waveguides using costly methods such as melt processing, molecular beam epitaxy, ion implantation, or laser deposition. [10][11][12][13] The low solubility and non-uniform distribution of Er 3+ in conventional ceramics and glasses pose an additional barrier toward fabricating low-loss monolithic ceramic waveguides. The high processing costs and low solubility of ceramic waveguides have thus driven the development of polymeric composite waveguides comprising of infrared-emitting Er 3+ -doped nanoparticles that are dispersed in polymer matrices. The inorganic nanoparticlepolymer system seeks to harness the advantages of both inorganic nanocrystals (low phonon energy and intense emissions) and polymer matrices (low cost, fl exibility, and excellent processability). [ 14 ] High optical transparency and homogeneous dispersion of brightly emitting inorganic nanoparticles at high loadings in polymer matrices are needed for fabrication of low-loss optically active nanocomposites. One of the methods of preparing transparent composites is to have an excellent dispersion of small particles (<<100 nm) at a high loading. It is also critical to synthesize brightly emitting rare earth doped nanocrystals that are well dispersed within the polymers. The emission effi ciency of the rare earth doped nanocrystals is governed by the host-dopant chemistries, and is infl uenced by various factors including energy transfer rates and energy cross-relaxation pathways. NaYF 4 is one of the most effi cient infrared-emitting host materials for Er 3+ due to its low phonon energy. [ 15,16 ] Among the various polymers, poly (methyl methacrylate) (PMMA) is commonly used for optical devices due to its excellent infrared transmissivity. [17][18][19][20][21][22] Transparent composites with low solids loading (<3 vol%) using surface modifi ed nanophosphors, and high solids loading (≈80 wt%) using costly polymers and processing methods have been reported elsewhere. [ 14 ] Decreasing both the primary and secondary (agglomeration) particle sizes drastically decrease scattering losses, which is The integration of inorganic rare earth doped nanoparticles in polymer matrices to obtain transparent polymer composites has attracted much attention in optical applications as the polymer-based systems harness the benefi ts of both inorganic and polymer materials. To obtain highly emissive nanocomposites, it is highly desirable to maximize the loading of nanoparticles in the polymer matrices while minimizing scattering losses. This work develops a nanocomposite with brightly infrared-emitting NaYF 4 :Yb,Er nanoparticles dispersed in hydrolyzed polyhedral oligomeric silsesquioxanegraft-poly (methyl methacrylate) (H-POSS-PMMA) matrix, which is prepared by spin coating. In this process, H-POSS-PMMA acts as both surfac...

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Section: Conformation Of Poss-pmma and H-poss-pmma In Solutionmentioning

confidence: 99%

Section: Conformation Of Poss-pmma and H-poss-pmma In Solutionmentioning

confidence: 99%

Synthesis and Interfacial Properties of Optically‐Active Photonic Nanocomposites with Single Nanoparticle Dispersion at High Solids Loading

Zhao

Sun

et al. 2016

Adv Materials Inter

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“…The structure of reactive aggregate described above brings about that alkali-silica reaction will run in similar way as for limestone aggregates. This case was described by Monnin et al [ 46 ]. Sandstone described by Rivard et al [ 28 ], in which poorly crystallized siliceous cementing substance is the reactive phase bonding unreactive phases, behaves differently.…”

Section: Discussionmentioning

confidence: 80%

Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar

Czapik

2018

Materials

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The mechanism of concrete degradation as a result of an alkali-silica reaction (ASR) largely depends on the mineral composition and microstructure of the reactive aggregate. This paper shows the reactivity results of quartz-glaukonitic sandstone, which is mainly responsible for the reactivity of some post-glacial gravels, available in Poland. After initial petrographic observations under a light microscope, the mode of sandstone degradation triggered by the reaction with sodium and potassium hydroxides was identified using scanning electron microscopy (SEM). It has been found that chalcedony agglomerates present in sandstone are separated from the rock matrix and subsequently cause the cracks formation in this matrix. Additionally, microcrystalline and potentially reactive silica is also dispersed in sandstone cement.

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“…The main mineralogical constituents of raw limestone and the sorbents after dissolution are portlandite (Ca(OH) 2 ) and calcite (CaCO 3 ). The presence of portlandite (Ca(OH) 2 ) peaks in raw limestone could have been due to contamination or exposure to moisture during preparation for XRD analysis [23]. The portlandite peaks increase with dissolution period while calcite peaks reduce with prolonged dissolution period.…”

Section: Xrd Analysismentioning

confidence: 99%

Semi‐Empirical Model for Limestone Dissolution in Adipic Acid for Wet Flue Gas Desulfurization

et al. 2014

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Wet flue gas desulfurization systems are commonly applied to remove sulfur dioxide by contacting it with limestone in an aqueous phase. The effects of pH, stirring speed, solid-to-liquid ratio, acid concentration, and temperature on the dissolution rate of limestone in adipic acid were investigated. The reaction dissolution kinetics was determined by fitting the experimental data into the shrinking core model. The sorbent was characterized at different dissolution periods. An increase in the specific surface area of the sorbent was attributed to formation of portlandite. The experimental data were found to fit the shrinking core model with chemical reaction control. A semi-empirical model was developed from the experimental data to describe the dissolution kinetics.

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Petrography study of two siliceous limestones submitted to alkali-silica reaction

Cited by 19 publications

References 6 publications

Synthesis and Interfacial Properties of Optically‐Active Photonic Nanocomposites with Single Nanoparticle Dispersion at High Solids Loading

Synthesis and Interfacial Properties of Optically‐Active Photonic Nanocomposites with Single Nanoparticle Dispersion at High Solids Loading

Degradation of Glaukonite Sandstone as a Result of Alkali-Silica Reactions in Cement Mortar

Semi‐Empirical Model for Limestone Dissolution in Adipic Acid for Wet Flue Gas Desulfurization

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