Effect of some surfactants on SO2–marble reaction

Böke, Hasan; Göktürk, E. H.; Saltık, Emine N. Caner

doi:10.1016/s0167-577x(02)00899-6

Cited by 21 publications

(6 citation statements)

References 8 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: 60%

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: 60%

Ageing of lime mortars with admixtures: Durability and strength assessment

Izaguirre

Lanas²,

Álvarez

2010

Cement and Concrete Research

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“…Furthermore, the deterioration is also the direct result of atmospheric pollution due to soot, grease, dust, etc., implying the deposition of suspended particles on the stonework surface, enhancing the SO 2 deposition, a very reactive compound with a significant corrosive effect on marble surface [15,16]; especially for outdoor monument, anthropogenic factors must be also considered [17].…”

Section: Introductionmentioning

confidence: 99%

Biotechnology and Cultural Heritage Conservation

Palla¹

2020

Heritage

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The deterioration of cultural asset is induced by biological, chemical, and physical factors, influenced by anthropogenic activity and environmental conditions. In this study, the contribution of biotechnology is emphasized to define the conservation strategy, for a marble Fountain (Two Dragons, XV century) located in Palermo city center, based on an integrated approach and eco-friendly procedures. Biotechnological protocols are preliminarily applied as an integrated approach, based on microscopy observation, in vitro culture and genomic DNA analysis to recognize and characterize microbial communities. Several biological systems have been identified: green algae (Chlorella) and cyanobacteria (Cyanobium, Oscillatoria); bacteria (Arthrobacter, Bacillus, Micrococcus, Paracoccus); fungi (Alternaria, Aspergillus, Penicillium, Phoma, Fusarium, Cladosporium). In order to address biological colonization, the commercial Tea Tree Oil (Melaleuca alternifolia) and laboratory-distilled (Calamintha nepeta and Allium sativum) EOs, have been assayed by in vitro Agar disc diffusion, Well-plates diffusion, and Micro-dilution methods; the result allows to define the most appropriate EOs concentration to use. In a green conservation prospective, this study highlighted that EOs can potentially replace the traditional biocides, but the activity must be preliminary evaluated by centring the choose specifically on each microbial taxon identified.

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“…Furthermore, the possible ways of slowing down the SO 2 -calcite reaction are producing the less reactive substrate on the marble surface by using some water soluble organic and inorganic compounds such as oleate, oxalate and phosphate ions [12][13][14]. The results of these studies showed that oxalate and oleate anions produced less reactive calcium oxalate and calcium oleate substrate and provided significant protection to marble exposed commonly in sheltered places [13].…”

Section: Introductionmentioning

confidence: 99%