According to [25] the impact sound insulation test is probably the most currently applied in the context of natural and recycled sound insulation products because these products are very likely to be applied as a resilient layer of floating floors. This test was also adopted here to evaluate the sound insulation potential of the corn cob particleboard. The standards [26], [27], [28] and [29] were followed. The experimental setups are crucial stages for the success of this study which is described in detail in the following sections. Some adopted experimental simplifications are also used.
3.1. Facility, equipment and setup
Two classrooms of a building located in the university of Trás-os-Montes e Alto Douro campus, in Vila Real city, Portugal, were adopted as emitting and receiving rooms. Both rooms are geometrically similar and have the layout shown in Fig. 2. One room is superjacent (i.e. the emitting room which is located on the second floor) to the other (i.e. the receiving room which is located on the first floor). There is a road next to the building and, therefore, the sound resulting from the traffic had to be taken into account in this evaluation. The tests were performed in July 2011, when the semester had already ended and there were no classes.
According to [25] the impact sound insulation test is probably the most currently applied in the context of natural and recycled sound insulation products because these products are very likely to be applied as a resilient layer of floating floors. This test was also adopted here to evaluate the sound insulation potential of the corn cob particleboard. The standards [26], [27], [28] and [29] were followed. The experimental setups are crucial stages for the success of this study which is described in detail in the following sections. Some adopted experimental simplifications are also used.3.1. Facility, equipment and setupTwo classrooms of a building located in the university of Trás-os-Montes e Alto Douro campus, in Vila Real city, Portugal, were adopted as emitting and receiving rooms. Both rooms are geometrically similar and have the layout shown in Fig. 2. One room is superjacent (i.e. the emitting room which is located on the second floor) to the other (i.e. the receiving room which is located on the first floor). There is a road next to the building and, therefore, the sound resulting from the traffic had to be taken into account in this evaluation. The tests were performed in July 2011, when the semester had already ended and there were no classes.
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