Sulfation of calcitic and dolomitic lime mortars in the presence of diesel particulate matter

Cultrone, Giuseppe; Arizzi, Anna; Sebastián, Eduardo; Rodríguez-Navarro, Carlos

doi:10.1007/s00254-008-1379-9

Cited by 48 publications

(36 citation statements)

References 44 publications

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“…Some previous work showed crystal shapes belonging to calcium sulphate crystals [8,20] and other studies presented calcium sulphite hemihydrate crystals with rough spherical and platelet forms [42,43]. In the present study, it seems that the addition of surfactant molecules (water-repelling admixtures) to the mortar favoured the formation of agglomerates of acicular calcium sulphite hemihydrate crystals.…”

Section: Mortars With Water-repelling Agentssupporting

confidence: 46%

“…8 shows agglomerates of acicular crystals. It may be suggested that they are calcium sulphite hemihydrate, taking into account the facts that (i) FTIR and XRD showed the presence of calcium sulphite hemihydrate as a result of the SO 2 deposition; (ii) previous publications reported many different shapes for calcium sulphate crystals obtained after SO 2 exposure of calcareous materials [8,20], but none of them had the observed shape; (iii) EDAX analysis showed that these crystals were made of sulphur, calcium and oxygen atoms; and (iv) Chen et al [41] obtained agglomerates of acicular crystals of calcium sulphite hemihydrate from crystallization studies performed at high calcium concentrations and low pH, their shape being identical to the crystals in Fig. 8.…”

Section: Mortars With Water-repelling Agentsmentioning

confidence: 99%

“…Calcium sulphate dihydrate appears as the most important product of decay in carbonated materials when suitable catalysts are present [23]. Several factors affecting SO 2 deposition have been discussed by Cultrone et al [20].…”

Section: Introductionmentioning

confidence: 99%

“…Several previous studies pointed to the significance of the chemical composition for the mortar's durability [6,8,20,[25][26][27], while air content, porosity, pore structure, permeability and water absorption through capillarity have been quoted as essential factors affecting the durability of a mortar [28]. Admixtures can be useful in order to improve these properties and to obtain better performance from the lime mortar.…”

Section: Introductionmentioning

confidence: 99%

“…The extent to which a mortar is affected by these deterioration factors is a function of the mortar's properties, which depend, in turn, on several issues, such as the kind and characteristics of the binder and the aggregate, the binder/aggregate ratio, the amount of mixing water, the mortar's permeability [9][10][11][12], the water absorption capacity through capillarity [10,13], water intake [7,14,15], the presence of admixtures and the curing conditions [16][17][18]. SO 2 exposure is supposed to affect the mortars because gaseous SO 2 has been widely reported to react with calcium carbonate, giving rise to the formation of both calcium sulphite hemihydrate (CaSO 3 .1/2H 2 O) and calcium sulphate dihydrate (CaSO 4 ·2H 2 O) on the mortar's surfaces [6,8,[19][20][21]. Calcium sulphite has been considered to be the most important product obtained under certain circumstances, such as the absence of catalyst [21,22].…”

Section: Introductionmentioning

confidence: 99%

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Ageing of lime mortars with admixtures: Durability and strength assessment

Izaguirre

Lanas²,

Álvarez

2010

Cement and Concrete Research

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Lime-based mortars modified with admixtures were prepared and subjected to different environments such as outdoor and indoor exposures, climatic chamber, SO 2 -chamber, and freezing-thawing cycles. The influence that the different admixtures (water repellents, water retainers, polypropylene fibre and a viscosity modifier) had on the pore size distribution of the hardened specimens was assessed and related to the water absorption capacity, and hence to the durability. Ageing resistance and mechanical strengths improved when additives reduced the water intake and increased the aircontent. High dosages of water repellents were necessary to enhance the durability, sodium oleate being the most effective additive to endure freezing processes. Also the low tested dosage of fibre, a water retainer (guar gum derivative), and a starch proved to be useful. SO 2 deposition caused the formation of calcium sulphite hemihydrate as the main degradation product. A very small amount of calcium sulphate dihydrate was observed. A crystal habit composed of acicular agglomerates of calcium sulphite hemihydrate was detected in SO 2 deposition on calcareous materials.3

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Section: Mortars With Water-repelling Agentssupporting

confidence: 46%

Section: Mortars With Water-repelling Agentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Ageing of lime mortars with admixtures: Durability and strength assessment

Izaguirre

Lanas²,

Álvarez

2010

Cement and Concrete Research

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Limestone Provenance in Roman Lime‐Volcanic Ash Mortars from the Villa dei Quintili, Rome

et al. 2015

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Roman mortars were collected from the Villa dei Quintili in Rome, an archaeological site consisting of numerous edifices from nine construction phases dating from the 2nd century A.D. to modern times. A multianalytical approach was used on 34 mortar samples to infer the evolution of production techniques over time and to identify the source area of calcareous raw materials used in the preparation of the lime. Optical microscopy, scanning electron microscopy coupled with an energy-dispersive system, and laser ablation inductively coupled plasma mass spectrometry were used to study the samples. The major and trace element data were compared with the compositions of two types of limestone samples (Calcare Massiccio and Calcare Maiolica) collected from the Cornicolani Mountains. The results suggest that the technological practices and the calcareous raw materials used for lime production remained unchanged over the time period considered (2nd century A.D. to 3rd century A.D.). The compositions of lime-related particles in the mortars match those of Calcare Maiolica, which suggests its use as raw material for lime production. On the whole, the results are in agreement with data from existing literature regarding both the use by Roman builders of specific raw materials for the mortars' production and the relative supply area. C 2015 Wiley Periodicals, Inc.

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