Portal de Periódicos da CAPES

Artigo Acesso aberto Produção Nacional Revisado por pares

BIBTEX RIS

Impacto do intemperismo no arenito de revestimento do Teatro Municipal de São Paulo

2008; UNIVERSIDADE DE SÃO PAULO; Volume: 8; Issue: 1 Linguagem: Inglês

10.5327/z1519-874x2008000100006

2316-9095

Eliane Aparecida Del Lama, Gergely Andrés Julio Szabó, Lauro Kazumi Dehira, Yushiro Kihara,

Geography and Environmental Studies

The Municipal Theater is one of the post cards of São Paulo city. It was built in 1911 and its frontal façade is revested with Itararé Sandstone. This sandstone comes from the Flona de Ipanema (Ipanema National Forest) area, located in Iperó, São Paulo State. Formerly this place included the Royal Ipanema Iron Factory, and nowadays it is a historical, archaeological and natural heritage site. The theatre façade is quite deteriorated due to the petrographic composition of the rock. The Itararé Sandstone is stratified with sigmoidal features and with grain size ranging from fine to coarse. Petrographically it is a feldspathic sandstone with clayey matrix in variable proportions. X-ray diffractometry analyses revealed that this matrix is constituted mainly by clay minerals of the smectite group with additional contributions of chlorite and illite. Mercury porosimetry shows that the porosity ranges from 10% to 18%. Mapping of the façade identified the following alteration forms: biological colonization, concretion, erosion, peeling, fissure, incrustation, open joint, spalling, stain, plaque, plaquette and vegetation. The industrialization and city growth did not play a significant role in the alteration of the building stone of the São Paulo Municipal Theater. Instead, this process is intrinsic to the petrographic characteristics (presence of expansive clay minerals, high porosity) and structure of the sandstone utilized, making it unsuitable as building stone.