Influence of relative humidity on the carbonation of calcium hydroxide nanoparticles and the formation of calcium carbonate polymorphs

López-Arce, Paula; Gomez-Villalba, L. S.; Martínez-Ramírez, S.; Buergo, Mónica Álvarez de; Fort, Rafael

doi:10.1016/j.powtec.2010.09.026

Cited by 174 publications

(105 citation statements)

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“…Evidencia de ello es la presencia de las fases inestables aragonito (ortorrómbico) y vaterita (hexagonal), con un crecimiento cristalino distinto, que puede llegar a afectar los resultados del comportamiento hídrico una vez aplicados en la piedra. Un comportamiento similar en cuanto al proceso de transformación de fases ha sido obtenido utilizando una solución coloidal de nanorestore® con mayor concentración [11], aunque en este caso el grado de cristalinidad es más bajo identificándose alto contenido de carbonato de calcio amorfo y monohidrocalcita. Los resultados obtenidos aquí, son comparables con los ensayos realizados a 90% de humedad relativa en iguales condiciones utilizando el mismo producto consolidante.…”

Section: Discusión De Resultadosunclassified

“…Es por ello que parece que la aplicación de nanopartículas de hidróxido cálcico dispersas en diferentes tipos de alcoholes para la consolidación de materiales carbonáticos puede llegar a solventar este problema [10], [11].…”

Section: Introductionunclassified

“…A diferencia de los trabajos realizados anteriormente [10,11], el presente estudio está enfocado a evaluar los resultados de la aplicación de un producto comercial diferente, aunque igualmente basado en nanopartículas de hidróxido de calcio para aplicaciones como consolidante. En este caso, el consolidante utilizado ha sido obtenido por el mismo método de síntesis coloidal, aunque con diferentes condiciones experimentales [14].…”

Section: Introductionunclassified

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Evaluación del tratamiento de consolidación de dolomías mediante nanopartículas de hidróxido de calcio en condiciones de alta humedad relativa

Villalba¹,

López-Arce²,

Zornoza-Indart³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

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En este artículo se presentan los resultados del tratamiento aplicado a muestras de piedra dolomía mediante una solución coloidal isopropílica basada en nanopartículas de hidróxido de calcio en una concentración de 2,0g/l. El proceso de consolidación de la piedra ha sido monitoreado antes y después de su aplicación a los 28 días de estar expuesta a una atmósfera del 75% de humedad relativa. Se ha realizado un estudio morfológico y estructural del consolidante confirmándose el proceso de carbonatación. Los resultados de difracción de rayos X, microscopía electrónica (TEM y ESEM) y difracción de electrones realizados al producto consolidante han confirmado la transformación de la fase portlandita a los polimorfos de carbonato de calcio de tipo calcita, aragonito y vaterita. Los ensayos petrofísicos realizados a la piedra antes y después de su aplicación, han demostrado que se produce una mejora de las propiedades físicas e hídricas indicado por el aumento tanto en la velocidad de propagación de ultrasonidos como en la densidad del material y una disminución de su coeficiente capilar, así como de la porosidad abierta sin producirse modificaciones significativas en el color y el brillo. La aplicación del tratamiento de consolidación propuesto, con este tipo de soluciones coloidales de nanopartículas, es un método natural y compatible con las características petrológicas del sustrato, sin generar daños secundarios sobre la piedra, resultando un método eficaz para la mejora de la durabilidad de rocas carbonáticas. Palabras clave: Consolidación, piedra, polimorfos de carbonato de calcio, nanopartículas de hidróxido cálcico, humedad relativa. Evaluation of a consolidation treatment in dolostones by mean of calcium hydroxide nanoparticles in high relative humidity conditionsIn this article, the results of a treatment applied to dolomitic stones using an isopropyl colloidal solution based on calcium hydroxide nanoparticles with a concentration of 2.0g/l are presented. The consolidation process in the stone has been checked before and after 28 days of exposure to 75% relative humidity. Morphologic and structural studies of the consolidating product confirmed the carbonation process. X ray diffraction, electron microscopy (TEM and ESEM), and electron diffraction carried out on the consolidating product have confirmed the transformation of portlandite phase to calcium carbonate polymorphs, calcite, aragonite and vaterite. Petrophysical tests performed on the stone before and after the application of the product have shown the improvement in the physical and hydrical properties due to the increase in the ultrasound velocity and density of the material, and a decrease in the capillarity coefficient and open porosity without significant changes in colour and brightness. The application of the consolidating product in the proposed experimental conditions is a natural method, compatible with the petrological characteristics of the substrate, without secondary damages on the stone, being an effective method to improve the durabili...

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Section: Discusión De Resultadosunclassified

Section: Introductionunclassified

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Evaluación del tratamiento de consolidación de dolomías mediante nanopartículas de hidróxido de calcio en condiciones de alta humedad relativa

Villalba¹,

López-Arce²,

Zornoza-Indart³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

Self Cite

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“…In order to be sure of the full carbonation of the lime nanoparticles [31], the specimens were stored at 50 % RH and T = 20°C for at least 4 weeks before microscopy observations.…”

Section: Application and Assessment Of Nanolime Depositionmentioning

confidence: 99%

Optimization of nanolime solvent for the consolidation of coarse porous limestone

et al. 2016

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The potentialities of nanomaterials for application in the field of conservation have been widely investigated in the last two decades. Among nanomaterials, nanolimes, i.e., dispersions of lime nanoparticles in alcohols are promising consolidating products for calcareous materials. Nanolimes are effective in recovering the very superficial loss of cohesion of decayed materials, but they do not always provide sufficient mass consolidation. This limitation is mainly related to the deposition of the nanoparticles nearby the surface of the material. Experimental research has been set up with the aim of improving the in-depth deposition of lime nanoparticles. Previous research by the authors has shown that nanolime deposition within a substrate can be controlled by adapting the nanolimes properties (kinetic stability and evaporation rate) to the moisture transport behavior of the substrate. Nanolime properties can be modified by the use of different solvents. In this research, nanolime dispersions have been further optimized for application on Maastricht limestone, a coarse porous limestone. Firstly, nanolimes were synthesized and dispersed in ethanol and/or water, both pure and mixed in different percentages. Subsequently, based on the kinetic stability of the nanolime dispersions, the most promising solvent mixtures were selected and applied on the limestone. The deposition of lime nanoparticles within the limestone was studied by phenolphthalein test, optical microscopy and scanning electron microscopy. The results confirm that nanolime dispersed in a mixture of ethanol (95 %) and water (5 %) can guarantee a better nanoparticles in-depth deposition within coarse porous substrates, when compared to dispersions in pure ethanol.

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“…Filling of cracks with calcite network would prevent rain penetration through them. Therefore, the study was focused on the preparation of variable concentrations of nano dispersive Ca(OH) 2 solutions with some additives that were able to penetrate through the deep cracks in the limestone (8)(9). Pilot treatment areas at the site are monitored to verify the longterm success of the treatments.…”

Section: Nemrut Mount Monumentmentioning

confidence: 99%

Atmospheric Weathering of Historic Monuments and Their Related Conservation Issues

Caner-Saltık

2018

MATEC Web Conf.

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Abstract. Atmospheric environment affects the materials of historic monuments and their structure starting from the time of their construction. Daily and seasonal changes in temperature and humidity, wind, snow and rainfall, soluble salts carried by water, biological agents, pollutant gases and particulate matter are some of the agents in atmospheric environment that introduce weathering by physical, chemical and biological processes in the materials of the monuments such as natural building stones, bricks, mortars and plasters, mud brick etc. The weathering processes need to be well diagnosed by identification of main mechanisms of decay and major responsible agents, degree and depth of deterioration expressed with measurable parameters of physical, physicomechanical properties, and micro structural changes together with their distribution on the monument. Success of conservation treatments strongly depend on those diagnostic studies and compatibility of the treatments with the deteriorated and relatively sound parts of the historic materials. Current approach to materials conservation is to be able to make minimum intervention to historic material by targeting the conservation treatment to the deteriorated area for the purpose of controlling the deterioration factors and achieving compatible and durable conservation of historical material. In this presentation, two examples of diagnostic research and conservation treatments based on and guided by the diagnostic results are summarized concerning historic stone monuments exposed to atmospheric environment since more than two thousand years. The first example is on the marble walls of Temple of Augustus in Ankara exposed to polluted urban atmosphere. The second example is on the limestone statues of Nemrut Mount Monument in Adıyaman-Turkey, exposed to rural atmosphere with harsh climatic conditions. Finally, a brief discussion on current research issues related to historic materials conservation in atmospheric environment is made.

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Influence of relative humidity on the carbonation of calcium hydroxide nanoparticles and the formation of calcium carbonate polymorphs

Cited by 174 publications

References 50 publications

Evaluación del tratamiento de consolidación de dolomías mediante nanopartículas de hidróxido de calcio en condiciones de alta humedad relativa

Evaluación del tratamiento de consolidación de dolomías mediante nanopartículas de hidróxido de calcio en condiciones de alta humedad relativa

Optimization of nanolime solvent for the consolidation of coarse porous limestone

Atmospheric Weathering of Historic Monuments and Their Related Conservation Issues

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