LE MURA SERVIANE ALLA STAZIONE DI ROMA TERMINI: UNA SFIDA

PER LA CONSERVAZIONEDEL TUFO

Giovanna Bandini1, Fabio Fratini2, Loredana Luvidi2, Anna Maria Mecchi2, Silvia Rescic2,

Riccardo Mancinelli3

1SoprintendenzaSpecialeperiBeniArcheologicidiRoma

2CNR-IstitutoperlaConservazioneelaValorizzazionedeiBeniCulturali-SediFirenze-Roma

3 CSRRestauroBeniCulturalis.a.s.

ABSTRACT

This paper is focused on evaluating the effectiveness of organic and inorganic consolidant products applied

onselectedtuffashlarsoftheServianWallinPiazzadeiCinquecento(Rome).

These walls were built with squared blocks of tuff in the sixth century BC. In the last decades they were

subjected to maintenance and restoration to limit degradation. These actions showed a marked effectiveness

on the control of biodeteriogens while serious and widespread phenomena of loss of material (flaking and

powdering) of the original volcanic stone are still present. Therefore, it was evident the need to carried out

treatments using products with consolidant effect. In the present paper the performance of some

consolidation treatment were assessed in situ after more than a year of their application. The selected

treatments are two products based on ethyl silicate (Tegovakon V100 and Estel 1000), an acrylic

microemulsion (Acril Me), a nano-lime (Calosil IP50) and a nano-silica (Syton X30), The effectiveness of

the consolidation treatments was evaluated by measuring the following parameters: color change

(colorimetrictest),resistancetopenetration(DRMS)andwaterabsorption(contactspongetest).

The results show good performance for the two products Tegovakon V100 and Estel 1000 and satisfactory

performance for Acril Me while Calosil IP50 and Syton X30 gave low improvement of the resistance to

penetration,noreductionofwaterabsorptionandformationofverythinwhitelayer.

Key-words: Consolidationtreatment,volcanictuff,nanoproducts,ethylsilicate,monitoring.