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Natural vegetal fibbers as a new resilient layer for floating floors
Rui Calejo Rodrigues; A CarvalhoThis paper presents a new use for a product made with low cost natural fibbers from vegetal by-products (coconuts coir) to be used as a resilient layer for floating floors to increase impact sound insulation. The acoustic behaviour was characterized by in situ measurements using concrete floors in accordance with standards EN 140-7 and 717-2. The use of this material in floating floors showed in laboratorial me...
Expedite methodology for assessing noise levels in an urban scenario based on a...
A Carvalho; Tiago M. D. Ferreira; Rui Calejo RodriguesWith the new Portuguese Noise Code (and the new European Directive) there is a necessity to develop an expedite methodology to evaluate noise levels at typical urban scenarios, checking for their ability to be reproduced with reliability at urban spaces with similar occupational pattern. In this work, a new urban scenario was studied representing a typical backyard situation in an urban centre, based on continu...
The ACUSTILAB, a small Educational double reverberant chamber
A Carvalho; Rui Calejo RodriguesThis paper presents the ACUSTILAB, an educational physical tool designed by the authors to be used by civil engineering students in laboratory classes regarding environmental and building acoustics. The ACUSTILAB is a fully functional scale model (about 1:2) of a double reverberant chamber with 1.5 x 3.5 x 1.4 m3. Its main use is to help teach the practical concepts of reverberation time and sound insulation an...
Practical methodology for speedy environmental field measurements
Rui Calejo Rodrigues; A CarvalhoNoise mapping field measurements in a vast number of points and using large periods of sampling in every location is a very time consuming task. It would be useful, in alternative, to know at what time during the day or night the measurements should be done but using a short time interval to achieve similar results as the ones found by long and regular measurements procedures. Following a large campaign of fiel...
Expeditious noise mapping at a municipal level
A Carvalho; Rui Calejo RodriguesThe 1987 Portuguese Noise Code requires noise zoning using the LA50 parameter in two periods (day and night). The new Portuguese Noise Code (to be published soon) will use the parameter LAeq for the same periods and purposes but enforces the municipalities to determine their noise maps. This will be a huge task for the 307 municipalities. Therefore there is a need to find a fast but valid method to perform that...
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