Kinetics of Reaction of SO2 with Marble

Kulshreshtha, Niraj P.; Punuru, Adinarayana R.; Gauri, K. Lal

doi:10.1061/(asce)0899-1561(1989)1:2(60)

Cited by 21 publications

(18 citation statements)

References 12 publications

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“…Let be the domain occupied by the specimen of calcite under consideration and set s for the total concentration of SO 2 , c for the density of calcite and for the density of gypsum. Following [1,3,10], we assume that s and c satisfy the following balance laws…”

Section: Physical Motivationsmentioning

confidence: 99%

“…The mathematical description of the time evolution of sulphation process has been first proposed in [10], to give some measurements of the main physico-chemical parameters. Different regions and time regimes were described by different parameters and models, and then matched to fit the experimental behavior of the reaction.…”

Section: Physical Motivationsmentioning

confidence: 99%

“…There is an extensive chemical literature about the deterioration mechanisms of natural building stones [6,9,10,14,15], which deals with problems concerning modern and historical buildings. Sulphur dioxide and nitrogen oxides emitted into the atmosphere by sources related to industry, transportation and heating, react with calcium carbonate stones to form sulphates and nitrates, which, due to their solubility in water, may be drained away or, if protected from the rain, may form crusts, that eventually exfoliate, see [6].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Global existence of solutions to a nonlinear model of sulphation phenomena in calcium carbonate stones

Guarguaglini¹,

Natalini²

2005

Nonlinear Analysis: Real World Applications

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Section: Physical Motivationsmentioning

confidence: 99%

Section: Physical Motivationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Global existence of solutions to a nonlinear model of sulphation phenomena in calcium carbonate stones

Guarguaglini¹,

Natalini²

2005

Nonlinear Analysis: Real World Applications

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“…According to Gauri et al [16,17], XRD cannot be effectively used to quantify these compounds because of the inability to reproduce peak intensities as a result of preferred orientation of analysed crystals. The FTIR method proposed in this work, on the other hand, is immune to such problems.…”

Section: Comparison With Standard Chemical and Xrd Methodsmentioning

confidence: 99%

Quantification of CaCO3–CaSO3·0.5H2O–CaSO4·2H2O mixtures by FTIR analysis and its ANN model

et al. 2004

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A new quantitative analysis method for mixtures of calcium carbonate (CaCO 3 ), calcium sulphite hemihydrate (CaSO 3 Á1/2H 2 O) and gypsum (CaSO 4 Á2H 2 O) by FTIR spectroscopy is developed. The method involves the FTIR analysis of powder mixtures of several compositions on KBr disc specimens. Intensities of the resulting absorbance peaks for CaCO 3 , CaSO 3 Á1/2H 2 O and CaSO 4 Á2H 2 O at 1453, 980, 1146 cm À 1 were used as input data for an artificial neural network (ANN) model, the output being the weight percent compositions of the mixtures. The training and testing data were randomly separated from the complete original data set. Testing of the model was done with successfully low-average error levels. The utility of the model is in the potential ability to use FTIR spectrum to predict the proportions of the three substances in unknown mixtures. D

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“…The analysis of the data obtained from our experimental study results in the following equations from which the thickness of the crust may be calculated [3,4]. CBo~0 (1)…”

Section: Thickness Of the Gypsum Crustmentioning

confidence: 99%

The sulfation of marble and the treatment of gypsum crusts

Gauri¹,

Chowdhury²,

Kulshreshtha³

et al. 1989

Studies in Conservation

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We have reacted Georgia marble in sulfur dioxide (S02) enriched atmospheres and calcul~ted the reaction rate constant. This constant was denved from surface reduction data, obtained by leaching the reaction product from samples exposed for different periods of time. Application of this constant to marble weathered in known ambient levels of sulfur dioxid~(SO2) and relative humidity, .allows the prediction of the thickness of the resulting gypsum crust formed over a given period of time. We have found that the crust grows outwards due to calcium ions which migrate from the interior and then react with sulfur dioxide at the sample surface. Thus, any treatment of the sulfated marble should include the considerations that the crust only masks the marble surface and is not an integral part of the original sculpture, and that cavities exist in~he u:nderlying layer of marble from which the calcIum Ions were selectively depleted.

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Kinetics of Reaction of SO2 with Marble

Cited by 21 publications

References 12 publications

Global existence of solutions to a nonlinear model of sulphation phenomena in calcium carbonate stones

Global existence of solutions to a nonlinear model of sulphation phenomena in calcium carbonate stones

Quantification of CaCO3–CaSO3·0.5H2O–CaSO4·2H2O mixtures by FTIR analysis and its ANN model

The sulfation of marble and the treatment of gypsum crusts

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