Acoustic Treatments Aiming to Achieve the Italian Minimum Environmental Criteria (CAM) Standards in Large Reverberant Classrooms

Authors

  • Umberto Berardi Ryerson University http://orcid.org/0000-0002-0508-6195
  • Gino Iannace Università degli Studi della Campania « Luigi Vanvitelli », Borgo San Lorenzo Aversa (Ce)
  • Amelia Trematerra Università degli Studi della Campania « Luigi Vanvitelli », Borgo San Lorenzo Aversa (Ce)

Keywords:

classrooms, clarity, reverberation time, speech intelligibility, Italian Minimum Environmental Criteria.

Abstract

A recent Italian legislation has established the Minimum Environmental Criteria (CAM) for any working environment. In regards to schools, adequate acoustic comfort targets are required in terms of noise control and acoustic quality. Schools must comply with the Italian technical standard UNI 11532 for their reverberation time (T), clarity (C50) and speech intelligibility (STI). In classrooms, the following values are required: T<0.7s, C50>0dB, and STI>0.6. In sports facilities such as gyms, the CAM requirements are T<1.5 s, C50> -2 dB, and STI> 0.5. To achieve these objectives, the insertion of acoustic treatments is often unavoidable. The new requests for classrooms are leading acousticians to propose sound correcting interventions in many educational buildings. Acousticians typically use the perfectly diffused theory to calculate the minimum amount of needed sound-absorbing material to comply with current legislation. The purpose of this work is to evaluate the optimal position in which to place the minimum amount of sound-absorbing treatments to reach the CAM in some university classrooms. These classrooms have a marble floor and plastered walls and, at 1.0 kHz, have T values between 2.5 s and 4.5 s, C50 between 3 dB and -0.5 dB, and STI between 0.34 and 0.47. Using an acoustic software, it was possible to estimate the minimum quantity and the optimal placement of the sound-absorbing panels to insert in each classroom to reach the CAM.

Author Biography

Umberto Berardi, Ryerson University

Dr. Berardi is an Associate Professor at Ryerson University, in Toronto (Ontario, Canada). His main research interests are related to the study of building systems that incorporate new materials for improved performance.  Dr. Berardi contributes to several academic and scientific communities. He is the Editor-in-Chief of the Journal Canadian Acoustics, and he has been the editor of several special issues for journals such as BuildingsSustainability, and Advances in Mechanical Engineering

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Published

2019-04-26

How to Cite

1.
Berardi U, Iannace G, Trematerra A. Acoustic Treatments Aiming to Achieve the Italian Minimum Environmental Criteria (CAM) Standards in Large Reverberant Classrooms. Canadian Acoustics [Internet]. 2019 Apr. 26 [cited 2021 Oct. 28];47(1):73-80. Available from: https://jcaa.caa-aca.ca/index.php/jcaa/article/view/3278

Issue

Section

Murray's special issue