A new sound absorbing lightweight concrete masonry block

• Tipo: Artigo em Livro de Atas de Conferência Internacional
• Data: 1998

Autores

Hipólito Sousa (Autor) FEUP; A. Carvalho (Autor) FEUP

Ata de Conferência Internacional

Título: Housing- An Heritage for the future-Proceedings of the XXV IAHS World Housing Congress- Volume 1

XXV IAHS Congress

Lisboa, 29 June - 3 July

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia civil

CORDIS: Ciências Físicas > Física > Acústica

Outras Informações

Abstract (EN): The purpose of this paper is to present an innovative design approach for a sound absorbing lightweight concrete masonry unit made with expanded clay LECAÒ. This new type of block is presented and acoustically characterized. This block is especially suited for sound control in critical listening or performance spaces as well for noise control in noisy environments like industrial areas, power transformers substations, sound barriers, etc. The block measures 200x200x500 mm3 and weights about 13.8 kg. Its design and weight allows easy placement. Two options were tested: with and without fiberglass inserts (instaled at the block plant) in the unit's Helmholtz resonators chambers. The sound absorption results obtained in the I.D.I.T.'s reverberant chamber using ISO 354 are presented. Sound absorption coefficients (a) above 0.65 for frequency bands between 200 and 400 Hz were found. Noise Reduction Coefficients (NRC) of 0.61 were calculated.

Idioma: Português

Tipo (Avaliação Docente): Científica

Nº de páginas: 8