Anti-fouling additives for the consolidation of archaeological mortars in underwater environment: Efficacy tests performed on the apsidal fishpond of Castrum Novum (Rome, Italy)

This paper deals with the formulation of innovative mortars for the consolidation of archeological structures in underwater environment. The research was conducted within the frame of the MaTaCoS project (Advanced materials and technologies applied to the conservation of underwater cultural heritage) funded by MISE (Italian Ministry of Economic Development). The project concerns the design of advanced tools and methods for the protection of Underwater Cultural Heritage, through specific cleaning and consolidating procedures to be applied directly in situ. The fishpond of the archaeological site of Castrum Novum (Santa Marinella, Rome, Italy) was chosen as a pilot site for experimentation. It is a structure on the coastline, composed of only one tank, with an average immersion of 0.37 m below the sea level, and developing with an NE/SW orientation. The masonry structures reach the maximum thickness at the apex of the fishpond (4.70 m) and consist of a concrete conglomerate composed of slightly rough stones of medium size bound with non-hydraulic mortar. Selected mortars’ fragments taken from the fishpond were characterized by means of minero-petrographic technique in order to define their main constituents from a compositional and textural point of view and also to identify the various degradation processes, mainly biological colonization. Starting from the acquired information, innovative mortars were formulated with the addition of two different anti-fouling additives aimed to slow down the above-mentioned degradation. The efficacy of the anti-fouling products was tested on specimens settled in laboratory environment (artificial marine environment). This information could be useful both for the definition of restoration interventions and for planning preservation protocols to be applied in this peculiar environment.

[2]  K. Thomas,et al.  The environmental fate and effects of antifouling paint biocides , 2010, Biofouling.

[3]  Matthias Kraume,et al.  Membrane fouling - a review on the role of EPS , 2006 .

[4]  P ? ? ? ? ? ? ? % ? ? ? ? , 1991 .

[5]  S. Unkles,et al.  A survey of culturable aerobic and anaerobic marine bacteria in de novo biofilm formation on natural substrates in St. Andrews Bay, Scotland , 2011, Antonie van Leeuwenhoek.

[6]  S. Ruffolo,et al.  An Integrated Analytical Approach to Define the Compositional and Textural Features of Mortars Used in the Underwater Archaeological Site of Castrum Novum (Santa Marinella, Rome, Italy) , 2019, Minerals.

[7]  Darong Chen,et al.  Progress of marine biofouling and antifouling technologies , 2011 .

[8]  G. Donelli,et al.  Microbial Biofilms , 2014, Methods in Molecular Biology.

[9]  G. Montana,et al.  Different methods for soluble salt removal tested on late-Roman cooking ware from a submarine excavation at the island of Pantelleria (Sicily, Italy) , 2014 .

[10]  Tsuyoshi Murata,et al.  {m , 1934, ACML.

[11]  Nahed M. Wahba,et al.  Antimicrobial effects of pepper, parsley, and dill and their roles in the microbiological quality enhancement of traditional Egyptian Kareish cheese. , 2010, Foodborne pathogens and disease.

[12]  S. Ruffolo,et al.  Antifouling coatings for underwater archaeological stone materials , 2017 .

[13]  Gheyath K Nasrallah,et al.  “Green” ZnO-Interlinked Chitosan Nanoparticles for the Efficient Inhibition of Sulfate-Reducing Bacteria in Inject Seawater , 2018 .

[14]  R. Fort,et al.  Biodeterioration of marble in an underwater environment. , 2017, The Science of the total environment.

[15]  D. Barca,et al.  Archaeometric approach for the study of mortars from the underwater archaeological site of Baia (Naples) Italy: Preliminary results , 2015 .

[16]  J.L. Speier.  Development of an Organosilicone Antimicrobial Agent for the Treatment of Surfaces , 1982 .

[17]  Tianduo Li,et al.  Synthesis and Properties of Organosilicon Quaternary Salts Surfactants , 2012 .

[18]  M. Kıvanç,et al.  Inhibitory effects of six Turkish thyme-like spices on some common food-borne bacteria (short communication). , 1988, Die Nahrung.

[19]  Danna Zhou,et al.  d. , 1934, Microbial pathogenesis.

[20]  Giuseppe Montana,et al.  Laboratory tests addressed to realize customized restoration procedures of underwater archaeological ceramic finds , 2014 .

[21]  O. Sağdıç,et al.  Note: Effect of Some Spice Extracts on Bacterial Inhibition , 2003 .

[22]  J. Costerton,et al.  Biofilms: Survival Mechanisms of Clinically Relevant Microorganisms , 2002, Clinical Microbiology Reviews.

[23]  J. Speier,et al.  Destruction of microorganisms by contact with solid surfaces , 1982 .

[24]  S. Cosentino,et al.  In‐vitro antimicrobial activity and chemical composition of Sardinian Thymus essential oils , 1999, Letters in applied microbiology.