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Projectos de Limpeza
Colunas da Praça de São Pedro – Roma, Itália
Colonnades, Rome
Objects:
284 columns around St. Peter's Square (Vatican)
Building Material:
Travertin
Typ of Soiling:
Environmental pollution (acid rain, vehicle emissions)
Cleaning Equipment:
Blasting gun with compressed air, environment-friendly abrasive (calcium cabonate) and reduced water flow (HDS 1195)
Period of Cleaning:
July - October 1998
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